WO2022102561A1 - Egr device - Google Patents

Egr device Download PDF

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Publication number
WO2022102561A1
WO2022102561A1 PCT/JP2021/040937 JP2021040937W WO2022102561A1 WO 2022102561 A1 WO2022102561 A1 WO 2022102561A1 JP 2021040937 W JP2021040937 W JP 2021040937W WO 2022102561 A1 WO2022102561 A1 WO 2022102561A1
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WO
WIPO (PCT)
Prior art keywords
egr
pipe
passage
passage portion
heat
Prior art date
Application number
PCT/JP2021/040937
Other languages
French (fr)
Japanese (ja)
Inventor
衛 吉岡
伸二 河井
海翔 曹
Original Assignee
愛三工業株式会社
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Publication date
Application filed by 愛三工業株式会社 filed Critical 愛三工業株式会社
Priority to JP2022561894A priority Critical patent/JPWO2022102561A1/ja
Publication of WO2022102561A1 publication Critical patent/WO2022102561A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/18—Thermal insulation or heat protection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities

Definitions

  • the technique disclosed in this specification relates to an EGR device configured to flow a part of the exhaust gas discharged from the engine to the exhaust passage as EGR gas to the intake passage through the EGR passage and return it to the engine.
  • the EGR apparatus described in Patent Document 1 below is known.
  • an EGR cooler and an EGR valve are provided in the EGR passage, and an electronic control unit (ECU) controls the EGR valve to the required opening degree based on the engine rotation speed and the engine load. ..
  • the ECU determines at least one of the intake air temperature and the EGR gas temperature. When one of them is lower than the set value, the EGR valve is controlled to have an opening degree smaller than the required opening degree.
  • This control prevents a large amount of EGR gas, which has not been heated to a predetermined temperature, from flowing into the combustion chamber. Further, even before the engine is warmed up, the EGR passage is warmed by flowing a certain amount of EGR gas through the EGR passage.
  • This disclosed technique has been made in view of the above circumstances, and its purpose is to suppress a decrease in temperature of EGR gas flowing to a downstream passage portion of the EGR passage and to suppress generation of condensed water in the downstream passage portion.
  • the purpose is to provide an EGR device that makes it possible.
  • an embodiment of the present invention is configured such that a part of the exhaust gas discharged from the engine to the exhaust passage is made into EGR gas and flows to the intake passage through the EGR passage and is returned to the engine.
  • the EGR passage is provided with an EGR valve for adjusting the flow rate of the EGR gas
  • the EGR passage includes an upstream passage portion near the exhaust passage, a downstream passage portion near the intake passage, and an upper flow. It is intended that at least the most downstream portion of the middle flow passage portion, including the middle flow passage portion between the road portion and the downstream passage portion, is provided with a heat insulating means for keeping the EGR gas flowing there. ..
  • a heat insulating means for keeping the EGR gas flowing there is provided at least in the most downstream part of the middle flow passage portion of the EGR passage. Therefore, the heat of the EGR gas flowing from the upstream passage portion to the middle flow passage portion of the EGR passage is difficult to be transmitted to the outside by the heat insulating means, and flows to the downstream passage portion in a state where the EGR gas is kept warm.
  • the heat insulating means is formed by forming the middle flow passage portion with a resin material having a function of retaining heat of EGR gas. ..
  • the heat insulating means is configured by forming the middle flow passage portion with a resin material having a function of retaining heat of EGR gas. , The heat retaining property can be obtained in the middle flow passage portion itself, and it is not necessary to separately provide a heat insulating means.
  • the heat insulating means is preferably a heat insulating coat provided on the inner wall of the middle flow passage portion.
  • the heat insulating means is a heat insulating coat provided on the inner wall of the middle flow passage portion, so that the inner wall of the middle flow passage portion is provided. It becomes easy to form a heat insulating means for the warmth.
  • the middle flow passage portion includes a pipe made of a resin material having a function of retaining heat of EGR gas, and the heat insulating coat has a thickness thereof. Is preferably formed so as to gradually or gradually increase from the downstream side to the upstream side of the pipe.
  • the heat insulating coat is formed so that its thickness gradually or gradually increases from the downstream side to the upstream side of the pipe.
  • the temperature of the EGR gas flowing through the pipe is high on the upstream side of the pipe and decreases toward the downstream side. Therefore, the heat insulating property of the pipe is set according to the temperature change of the EGR gas flowing therein from the upstream side to the downstream side.
  • the heat insulating means is preferably an air layer provided outside the middle flow passage portion.
  • the heat insulating means includes a heating portion for heating the middle flow passage portion.
  • the heat insulating means includes the heating portion, the middle flow passage portion is heated by the heating portion. Therefore, both heat retention and temperature rise are possible.
  • the heating portion is a heat-generating film that generates heat by energization.
  • the heat generating film is heated by energization, so that the middle flow passage portion is widely heated in terms of surface at an arbitrary timing.
  • the heating portion is formed in at least a part of the middle flow passage portion and is composed of a hot water passage through which hot water flows.
  • the heating unit is composed of the hot water passage through which the hot water flows, the engine cooling water warmed by cooling the engine can be used. It can be used as hot water and flowed into a hot water passage.
  • the middle flow passage portion provided with the hot water passage includes an outer outer pipe and an inner inner pipe sandwiching the hot water passage, and is an outer pipe. It is preferable that the thickness of the inner tube is larger than the thickness of the inner tube.
  • the thickness of the outer pipe sandwiching the hot water passage is larger than the thickness of the inner pipe, so that the heat of the hot water is generated. It is easily transmitted to the inner wall of the inner pipe and difficult to escape to the outer wall of the outer pipe.
  • the hot water passage is provided along the flow path longitudinal direction of the middle flow passage portion.
  • the middle flow passage portion includes the EGR valve and the pipe arranged downstream from the EGR valve, and the EGR valve and the pipe. Is connected via a valve outlet flange provided on the outlet side of the EGR valve and a pipe inlet flange provided on the inlet side of the pipe, and the pipe and the downstream passage portion are connected to the pipe outlet provided on the outlet side of the pipe. It is connected via a flange and a passage inlet flange provided on the inlet side of the downstream passage portion, and a spacer is provided between the valve outlet flange and the pipe inlet flange and between the pipe outlet flange and the passage portion inlet flange. It is preferable that the hot water passage is provided along the circumferential direction of the spacer.
  • the hot water passage is composed of a metal pipe provided along the longitudinal direction of the flow path of the middle flow passage portion in the configuration of the above (8).
  • the hot water passage is composed of the metal pipe provided along the longitudinal direction of the flow path of the middle flow passage portion, the hot water passage is formed. It is more advantageous than the resin material against cracks caused by disturbance.
  • the metal pipe is fixed to the middle flow passage portion by insert molding.
  • the middle flow passage portion is provided with a holding means for holding the metal pipe along the longitudinal direction of the flow path, and the metal pipe is provided with a holding means. , It is preferable that the metal is fixed to the middle flow passage portion by being held by the holding means.
  • the metal pipe in addition to the action of the configuration of the above (12), the metal pipe is fixed by being held by the holding means along the longitudinal direction of the flow path of the middle flow passage portion.
  • the metal pipe In terms of resin cracks due to the difference in thermal expansion between the resin middle flow passage portion and the metal pipe and the manufacturing cost, it is superior to fixing the metal pipe to the middle flow passage portion by insert molding.
  • a heat transfer member is provided between the metal pipe held by the holding means and the middle flow passage portion, so that the metal pipe is provided. There is no gap between the pipe and the midstream passage, and the adhesion between the two is improved.
  • the heat transfer member is a flexible heat transfer sheet that is in close contact with the metal pipe and the middle flow passage portion.
  • an air layer for heat insulation is provided between the metal pipe and the holding means, so that the metal pipe is provided. The escape of heat from the air to the atmosphere is suppressed by the air layer.
  • the EGR passage has an EGR cooler for cooling the EGR gas and a bypass for bypassing the EGR cooler.
  • a passage and a bypass valve for opening and closing the bypass passage are further provided, the EGR cooler includes a heat exchanger for cooling, the heat exchanger includes an inlet and an outlet for EGR gas, and the bypass passage includes an EGR.
  • the midstream passage is located downstream of the heat exchanger outlet and the bypass passage outlet, including the gas inlet and outlet, and the EGR valve is provided in the midstream passage.
  • the middle flow passage portion is located downstream from the outlet of the heat exchanger and the outlet of the bypass passage, and is in the middle. Since the EGR valve is provided in the flow passage portion, the EGR gas flowing through the EGR valve and the middle flow passage portion flows to the downstream passage portion in a state of being kept warm by the heat insulating means.
  • a cooling unit for cooling at least a part of the bypass passage is further provided in the configuration of the above (17) or (18).
  • the EGR gas flowing through the bypass passage is cooled by the cooling portion, so that the EGR gas flows from the bypass passage to the middle flow passage portion.
  • the temperature of the EGR gas drops.
  • the EGR passage is further provided with an EGR cooler for cooling the EGR gas, and the EGR cooler is cooled.
  • the heat exchanger includes an inlet and an outlet for EGR gas, the middle flow passage portion is located downstream from the outlet of the heat exchanger, and the EGR valve is provided in the middle flow passage portion. Is preferable.
  • the middle flow passage portion is located downstream from the outlet of the heat exchanger, and the EGR is located in the middle flow passage portion. Since the valve is provided, the EGR gas flowing through the EGR valve and the middle flow passage portion flows to the downstream passage portion in a state of being kept warm by the heat insulating means.
  • the EGR valve includes a flow path through which the EGR gas flows, and the inner wall of the flow path has a function of retaining heat of the EGR gas. It is preferable that it is composed of a resin material having.
  • the flow path of the EGR valve is composed of a resin material having a function of retaining heat of the EGR gas. Heat retention is obtained in the flow path itself, and molding of the flow path becomes easy.
  • the flow path of the EGR valve includes an inlet and an outlet, and the inlet of the flow path becomes the outlet of the heat exchanger. It is preferable that they are arranged substantially adjacent to each other.
  • the inlet of the flow path of the EGR valve is arranged substantially adjacent to the outlet of the heat exchanger.
  • the EGR gas that has just flowed out from the outlet of the heat exchanger flows into the inlet of the resin flow path of the EGR valve at an early stage.
  • the heat transfer of the EGR gas to the middle flow passage portion can be reduced, the temperature drop of the EGR gas flowing to the downstream passage portion can be suppressed, and the downstream passage portion thereof can be suppressed. It is possible to suppress the generation of condensed water in.
  • the EGR gas can be effectively kept warm from the upstream side to the downstream side of the pipe according to the temperature change of the EGR gas flowing through the pipe.
  • the heat resistance of the piping can be effectively secured.
  • the number of parts constituting the EGR device can be reduced by the amount of the heat insulating means.
  • the EGR gas flowing through the middle flow passage portion can be effectively kept warm.
  • the EGR gas flowing through the middle flow passage portion can be responsively and stably kept warm.
  • heating can be performed without using the electrical configuration. Further, even if the flow of EGR gas in the middle flow passage is stopped, the heating of the middle flow passage is continued by the hot water in the hot water passage, so that when the EGR gas flows again in the middle flow passage, the middle flow is performed. The generation of condensed water in the road can be suppressed.
  • the heat transfer property of the hot water flowing through the hot water passage in the metal pipe to the inner wall of the middle flow passage portion can be improved. It is possible to improve the temperature rise property of the inner wall, and it is possible to improve the temperature rise property of the EGR gas flowing inside the middle flow passage portion.
  • the heat transfer property of the hot water flowing through the hot water passage to the inner wall of the middle flow passage portion can be further improved, and the temperature of the inner wall thereof is raised.
  • the property can be further improved, and the temperature rise property of the EGR gas flowing inside the middle flow passage portion can be further improved.
  • the temperature of the EGR gas can be lowered by the heat exchanger, and the EGR gas in the middle flow passage portion can be lowered. It is possible to suppress the melting damage due to.
  • the temperature of the EGR gas can be brought close to the heat resistant temperature of the resin constituting the middle flow passage portion, and the bypass passage can be provided. Even if the high temperature EGR gas flows, it is possible to suppress the melting damage of the middle flow passage portion due to the EGR gas.
  • the temperature of the EGR gas can be lowered by the heat exchanger, and the EGR gas in the middle flow passage portion can be lowered. It is possible to suppress the melting damage due to.
  • FIG. 6 is a configuration diagram showing a specific configuration on an EGR passage from an EGR cooler to an EGR gas distributor with a partial breakage according to the first embodiment.
  • FIG. 6 is a configuration diagram showing a configuration from the EGR valve of FIG. 2 to the EGR gas distributor according to the first embodiment.
  • FIG. 3 is a sectional view taken along line AA of FIG. 3 showing piping according to the first embodiment.
  • FIG. 3 is a sectional view taken along line BB of FIG. 3 showing piping according to the first embodiment.
  • a time chart showing the opening and closing of the EGR valve and the bypass valve and changes in various temperatures after the engine is started according to the first embodiment.
  • FIG. 3 is a configuration diagram according to FIG.
  • FIG. 5 is a cross-sectional view according to FIG. 5 showing piping according to the second embodiment.
  • FIG. 2 is a configuration diagram according to FIG. 2 showing a configuration from an EGR cooler to an EGR gas distributor according to a third embodiment.
  • FIG. 2 is a configuration diagram according to FIG. 2 showing a configuration from an EGR cooler to an EGR gas distributor according to a fourth embodiment.
  • FIG. 5 is a cross-sectional view showing a pipe cut in a direction orthogonal to the longitudinal direction thereof according to the fifth embodiment.
  • FIG. 6 is a cross-sectional view showing a pipe cut in a direction orthogonal to the longitudinal direction thereof according to the sixth embodiment.
  • FIG. 2 is a configuration diagram according to FIG. 2 showing a configuration from an EGR cooler to an EGR gas distributor according to a seventh embodiment.
  • FIG. 2 is a configuration diagram according to FIG. 2 showing a configuration from an EGR cooler to an EGR gas distributor according to an eighth embodiment.
  • FIG. 9 is a configuration diagram according to FIG. 9 showing a configuration from an EGR cooler to an EGR gas distributor according to a ninth embodiment.
  • FIG. 15 is a sectional view taken along line CC of FIG. 15 showing piping according to the ninth embodiment.
  • FIG. 16 is a cross-sectional view according to FIG. 16 showing a configuration of piping according to the tenth embodiment.
  • FIG. 15 is a configuration diagram according to FIG.
  • FIG. 15 showing a configuration from an EGR cooler to an EGR gas distributor according to the eleventh embodiment.
  • FIG. 18 is a sectional view taken along line DD of FIG. 18 showing piping according to the eleventh embodiment.
  • FIG. 19 is a cross-sectional view according to FIG. 19 showing piping according to the twelfth embodiment.
  • FIG. 19 is a cross-sectional view according to FIG. 19 showing piping according to the thirteenth embodiment.
  • FIG. 19 is a cross-sectional view according to FIG. 19 showing piping according to the 14th embodiment.
  • FIG. 19 is a cross-sectional view according to FIG. 19 showing piping according to the fifteenth embodiment.
  • FIG. 24 is a sectional view taken along line EE of FIG. 24 showing a pipe to which a metal pipe is fixed according to a sixteenth embodiment.
  • FIG. 26 is a sectional view taken along line FF of FIG. 26 showing a pipe to which a metal pipe is fixed according to the 17th embodiment.
  • FIG. 25 is a cross-sectional view according to FIG. 25 showing a pipe to which a metal pipe is fixed according to the eighteenth embodiment.
  • FIG. 27 is a cross-sectional view according to FIG. 27 showing a pipe to which a metal pipe is fixed according to the nineteenth embodiment.
  • FIG. 28 is a cross-sectional view according to FIG.
  • FIG. 28 showing a pipe to which a metal pipe is fixed according to the twentieth embodiment.
  • FIG. 29 is a cross-sectional view according to FIG. 29 showing a pipe to which a metal pipe is fixed according to the 21st embodiment.
  • FIG. 32 is a sectional view taken along line GG of FIG. 32 showing a pipe to which a metal pipe is fixed according to the 22nd embodiment.
  • FIG. 34 is a sectional view taken along line OH of FIG. 34 showing a pipe to which a metal pipe is fixed according to the 23rd embodiment.
  • FIG. 15 is a configuration diagram according to FIG. 15 showing a configuration from an EGR cooler to an EGR gas distributor according to the 24th embodiment.
  • FIG. 4 is a cross-sectional view showing a connection portion between a metal upstream pipe and its outlet flange and a resin downstream pipe and its inlet flange, which are the objects of measurement according to the 24th embodiment.
  • FIG. 4 is a cross-sectional view showing a connection portion between a metal upstream pipe and its outlet flange and a metal downstream pipe and its inlet flange, which are related to the 24th embodiment in inverse proportion and are measurement targets.
  • a time chart showing (A) changes in engine speed (EGR flow rate) and (B) changes in various temperatures according to the 24th embodiment.
  • FIG. 1 A time chart showing (A) changes in engine speed (EGR flow rate) and (B) changes in various temperatures according to the 24th embodiment.
  • FIG. 9 is a configuration diagram according to FIG. 9 showing a configuration from an EGR cooler to an EGR gas distributor according to another embodiment.
  • FIG. 6 is a configuration diagram showing a configuration from an EGR cooler to an EGR gas distributor according to another embodiment.
  • FIG. 6 is a cross-sectional view according to FIG. 35 showing the pipe 16 according to another embodiment.
  • FIG. 1 shows a gasoline engine system of this embodiment (hereinafter, simply referred to as “engine system”) by a schematic configuration diagram.
  • the engine system mounted on the automobile includes an engine 1 having a plurality of cylinders.
  • the engine 1 is a 4-cylinder, 4-cycle reciprocating engine and includes well-known configurations such as a piston and a crankshaft.
  • the engine 1 is provided with an intake passage 2 for introducing intake air into each cylinder and an exhaust passage 3 for deriving exhaust gas from each cylinder of the engine 1.
  • the intake passage 2 is provided with a throttle device 4 and an intake manifold 5.
  • the exhaust passage 3 is provided with an exhaust manifold 6 and a catalyst 7.
  • a high-pressure loop type exhaust gas recirculation device (EGR device) 11 is provided between the exhaust passage 3 and the intake passage 2.
  • EGR device high-pressure loop type exhaust gas recirculation device
  • the throttle device 4 is arranged in the intake passage 2 upstream of the intake manifold 5, and by driving the butterfly type throttle valve 4a to open and close with a variable opening according to the accelerator operation of the driver, the amount of intake air flowing through the intake passage 2 Is designed to be adjusted.
  • the intake manifold 5 is mainly composed of a resin material and is arranged in the intake passage 2 directly upstream of the engine 1.
  • One surge tank 5a into which the intake air is introduced and the intake air introduced in the surge tank 5a are used in the engine 1. It includes a plurality of (four) branch pipes 5b branched from the surge tank 5a for distribution to each cylinder.
  • the catalyst 7 contains, for example, a three-way catalyst in order to purify the exhaust gas.
  • the engine 1 is provided with a fuel injection device (not shown) for injecting fuel corresponding to each cylinder.
  • the fuel injection device is configured to inject fuel supplied from a fuel supply device (not shown) into each cylinder of the engine 1.
  • a combustible air-fuel mixture is formed by the fuel injected from the fuel injection device and the intake air introduced from the intake manifold 5.
  • the engine 1 is provided with an ignition device (not shown) corresponding to each cylinder.
  • the igniter is configured to ignite the combustible mixture in each cylinder.
  • the combustible air-fuel mixture in each cylinder explodes and burns due to the ignition operation of the ignition device, and the exhaust gas after combustion is discharged from each cylinder to the outside via the exhaust manifold 6 and the catalyst 7.
  • the piston (not shown) moves up and down in each cylinder, and the crankshaft (not shown) rotates to obtain power to the engine 1.
  • EGR device 11 As shown in FIG. 1, in the EGR device 11 of this embodiment, a part of the exhaust gas discharged from each cylinder of the engine 1 to the exhaust passage 3 is flowed to the intake passage 2 as an exhaust gas recirculation gas (EGR gas) to the engine 1. It is configured to recirculate to each cylinder of.
  • the EGR device 11 adjusts the flow rate of the exhaust gas recirculation passage (EGR passage) 12, the exhaust gas recirculation cooler (EGR cooler) 13 for cooling the EGR gas flowing through the EGR passage 12, and the EGR gas flowing through the EGR passage 12.
  • a device (EGR gas distributor) 15 is provided.
  • the flow path through which the EGR gas of the EGR cooler 13, the EGR valve 14, and the EGR gas distributor 15 flows also constitutes the EGR passage 12.
  • the piping constituting the EGR passage 12 includes an inlet 12a and an outlet 12b.
  • the inlet 12a is connected to the exhaust passage 3 upstream of the catalyst 7, and the outlet 12b is connected to the EGR gas distributor 15.
  • the EGR gas distributor 15 constitutes the final stage of the EGR passage 12.
  • the EGR valve 14 is provided downstream from the EGR cooler 13, and the EGR gas distributor 15 is provided downstream from the EGR valve 14.
  • the EGR gas distributor 15 is mainly composed of a resin material, has a horizontally long shape as a whole, and is arranged so as to cross a plurality of branch pipes 5b of the intake manifold 5 in the longitudinal direction thereof.
  • the EGR gas distributor 15 has a gas chamber 15a in which the introduced EGR gas is collected, and a plurality (four) gas distribution passages 15b for distributing the EGR gas from the gas chamber 15a to each branch pipe 5b. include.
  • the EGR passage 12 includes an upstream passage portion USP near the exhaust passage 3, a downstream passage portion DSP near the intake manifold 5 constituting the intake passage 2, and an upstream passage portion USP and downstream. Includes a midstream passage MSP between the passage DSP.
  • the upstream passage portion USP includes a passage portion between the inlet 12a of the EGR passage 12 and the EGR cooler 13.
  • the midstream passage portion MSP includes a passage portion from the EGR cooler 13 to the inlet of the EGR gas distributor 15 (details of the range of the midstream passage portion MSP will be described later).
  • the downstream passage DSP includes a passage in the EGR gas distributor 15.
  • the upstream passage portion USP, the middle flow passage portion MSP, and the downstream passage portion DSP are not separated by the substantial flow path length of the EGR passage 12, and are on the EGR passage 12. It is classified according to the arrangement of equipment such as the EGR cooler 13, the EGR valve 14, and the EGR gas distributor 15 provided in the EGR cooler 13. It is also possible to classify the upstream passage portion USP, the middle flow passage portion MSP and the downstream passage portion DSP by the substantial flow path length of the EGR passage 12.
  • FIG. 2 is a configuration diagram showing a specific configuration on the EGR passage 12 from the EGR cooler 13 to the EGR gas distributor 15 with a partial break.
  • FIG. 3 shows the configuration from the EGR valve 14 to the EGR gas distributor 15 in FIG. 2 by a block diagram.
  • the inlet 34a of the flow path 34 of the EGR valve 14 is connected to the outlet 21c of the EGR cooler 13, and the EGR passage 12 is connected to the outlet 34b of the flow path 34 of the EGR valve 14.
  • the inlet 16a of the pipe 16 constituting the above is connected, and the outlet 16b of the pipe 16 is connected to the inlet of the EGR gas distributor 15.
  • the EGR cooler 13 includes a casing 21.
  • the casing 21 is provided from the main passage 21a through which the EGR gas flows, the inlet 21b for introducing the EGR gas, the outlet 21c for leading out the EGR gas, the introduction portion 21d between the main passage 21a and the inlet 21b, and the main passage 21a. It includes a lead-out portion 21e to the outlet 21c, a bent flow path portion 21f, and a bypass passage 21g provided in parallel with the main passage 21a and for bypassing the main passage 21a.
  • the main passage 21a is provided with a cooling heat exchanger 23 that exchanges heat between the EGR gas and the refrigerant. The heat exchanger 23 cools the EGR gas flowing through the main passage 21a.
  • the cooling water of the engine 1 circulates in the heat exchanger 23 as a refrigerant.
  • the heat exchanger 23 has a well-known configuration.
  • a butterfly valve type bypass valve 24 for opening and closing the bypass passage 21g is provided in the upstream portion of the bypass passage 21g.
  • the EGR gas black arrow, indicated by a hatched arrow
  • the outlet 21c is arranged at a position higher in the vertical direction than the inlet 21b.
  • the condensed water generated inside the EGR cooler 13 (indicated by a white arrow) flows through the bypass passage 21 g from the downstream portion to the upstream portion.
  • the heat exchanger 23 includes an inlet 23a and an outlet 23b of the EGR gas
  • the bypass passage 21g includes an inlet 21ga and an outlet 21gb of the EGR gas
  • the midstream passage MSP is located downstream of the outlet 23b of the heat exchanger 23 and the outlet 21gb of the bypass passage 21g
  • the EGR valve 14 is provided in the midstream passage MSP. That is, in this embodiment, the midstream passage portion MSP is composed of a passage portion from the outlet 23b of the heat exchanger 23 of the EGR cooler 13 to the inlet of the EGR gas distributor 15.
  • the EGR valve 14 is composed of a motor unit 31 having a built-in step motor and a valve unit 32.
  • the valve portion 32 includes a flow path 34, a valve seat 35 arranged in the flow path 34, a valve body 36, and a valve shaft 37.
  • the valve portion 32 includes a metal outer housing 38, a resin inner housing 39, and a resin flow path member 40 that covers a portion of the outer housing 38 facing the flow path 34.
  • the inner wall of the flow path 34 is composed of a resin inner housing 39 and a resin flow path member 40. That is, the inner wall of the flow path 34 is made of a resin material having a function of retaining heat of the EGR gas.
  • the pipe 16 connected to the outlet 34b of the EGR valve 14 is formed by refracting in a channel shape.
  • the pipe 16 is made of a resin material having a function of keeping the EGR gas warm.
  • the resin material for example, "66 nylon" can be used.
  • FIG. 4 shows the pipe 16 with a cross-sectional view taken along the line AA of FIG.
  • FIG. 5 shows the pipe 16 with a cross-sectional view taken along the line BB of FIG.
  • the flow path 34 and the pipe 16 are formed on the entire inner wall of the flow path 34 of the EGR valve 14 and the entire inner wall of the pipe 16.
  • a heat insulating coat 41 is provided to keep the EGR gas flowing through the water warm.
  • a "ceramic coat" can be used as the heat insulating coat 41.
  • the heat insulating coat 41 corresponds to an example of the heat insulating means of this disclosed technique.
  • a heat insulating coat 41 for keeping the EGR gas warm is provided on the inner wall of the flow path 34 of the EGR valve 14 and the inner wall of the pipe 16 constituting the midstream passage portion MSP.
  • the thickness of the heat insulating coat 41 is formed to be uniform (same) between the upstream portion US, the middle flow portion MS, and the downstream portion DS of the pipe 16. To. Since the flow of EGR gas collides with the corner portion of the pipe 16 surrounded by the two-dot chain line S1 in FIG. 3, it is desirable to make the thickness of the heat insulating coat 41 particularly thicker than that of other portions.
  • the EGR passage 12 is composed of an upstream passage portion USP including an EGR cooler 13, a middle flow passage portion MSP including an EGR valve 14 and a pipe 16, and an EGR gas distributor 15. It is divided into a downstream passage section DSP. Since the flow path 34 of the EGR valve 14 and the inner wall of the pipe 16 constituting the midstream passage portion MSP are made of a resin material having a function of retaining heat of the EGR gas and have a certain length, the EGR valve 14 is used. The temperature drop of the EGR gas in the flow path 34 and the pipe 16 and the temperature of the EGR gas flowing into the EGR gas distributor 15 become problems. This is because when the EGR gas becomes lower than the dew point temperature, condensed water is generated in the EGR gas distributor 15.
  • the EGR gas flowing there is kept warm on the inner wall of the flow path 34 and the pipe 16 (middle flow passage portion MSP) of the EGR valve 14 provided in the EGR passage 12.
  • a heat insulating coat 41 heat insulating means
  • the heat of the EGR gas flowing from the EGR cooler 13 or the like (upstream passage portion USP) provided in the EGR passage 12 to the flow path 34 of the EGR valve 14 and the pipe 16 (middle flow passage portion MSP) is generated by the heat insulating coat 41.
  • the EGR gas flows to the EGR gas distributor 15 (downstream passage portion DSP) in a state where the EGR gas is kept warm.
  • the midstream passage portion MSP is located downstream from the outlet 23b of the heat exchanger 23 of the EGR cooler 13 and the outlet 21gb of the bypass passage 21g, and the EGR valve 14 is provided in the midstream passage portion MSP. Therefore, the EGR gas flowing through the flow path 34 of the EGR valve 14 and the pipe 16 flows to the EGR gas distributor 15 in a state of being kept warm by the heat insulating coat 41.
  • the temperature of the EGR gas can be lowered by the heat exchanger 15, and the flow path 34 and the pipe 16 (middle flow passage portion MSP) of the EGR valve 14 formed of the resin material are not melted by the EGR gas. It can be suppressed. Further, it is possible to reduce the heat transfer of the EGR gas to the resin material in the flow path 34 and the pipe 16 (middle flow passage portion MSP) of the EGR valve 14, and to the EGR gas distributor 15 (downstream passage portion DSP). The temperature drop of the flowing EGR gas can be suppressed, the EGR gas distributor 15 can be quickly warmed up, and the generation of condensed water in the EGR gas distributor 15 can be suppressed.
  • the flow path 34 of the EGR valve 14 constituting the middle flow passage portion MSP and the inner wall of the pipe 16 are made of a resin material having a function of retaining heat of the EGR gas, the flow path 34 thereof.
  • heat retention is obtained in the pipe 16 itself, and the flow path 34 and the pipe 16 can be easily formed. Therefore, it is possible to easily suppress the temperature drop of the EGR gas in the EGR valve 14 and the pipe 16 (middle flow passage portion MSP).
  • the heat insulating means is the heat insulating coat 41 provided on the inner wall of the flow path 34 and the pipe 16 of the EGR valve 14, the inner wall of the flow path 34 and the pipe 16 (middle flow passage portion MSP). It becomes easy to form a heat insulating means for the warmth. Therefore, it is possible to facilitate the manufacture of the EGR device 11 provided with the heat insulating means.
  • the flow path 34 of the EGR valve 14 is made of a resin material having a function of retaining heat in the EGR gas, the flow path 34 itself can obtain heat retention and the flow path thereof. Molding of 34 becomes easy. Therefore, it is possible to easily suppress the temperature drop of the EGR gas in the EGR valve 14.
  • FIG. 6 shows in this embodiment the opening and closing of the EGR valve 14 and the bypass valve 24 and changes in various temperatures after the engine is started by a time chart. That is, FIG. 6 shows the EGR gas temperature (pipe inlet gas temperature) PIG at the inlet 16a of the pipe 16 and the inner wall temperature of the inlet 16a of the pipe 16 when the EGR valve 14 and the bypass valve 24 are opened from a low temperature.
  • Pipe inlet inner wall temperature) PIW1, PIW2 EGR gas temperature at the outlet of the EGR gas distributor 15 (distributor outlet gas temperature) DOG1, DOG2, cooling water temperature (cooling water temperature) THW, at the outlet of the EGR gas distributor 15.
  • the changes in the inner wall temperature (distributor outlet inner wall temperature) DOWN1 and DOWN2 are shown.
  • the pipe inlet inner wall temperature PIW1 indicates a case where the heat insulating coat 41 is not provided on the inner wall of the pipe 16, and the pipe inlet inner wall temperature PIW2 shows a case where the heat insulating coat 41 is provided on the inner wall of the pipe 16.
  • the distributor outlet gas temperature DOG1 indicates a case where the heat insulating coat 41 is not provided on the inner wall of the pipe 16, and the distributor outlet gas temperature DOG2 shows a case where the heat insulating coat 41 is provided on the inner wall of the pipe 16.
  • the distributor outlet inner wall temperature DOWN 1 indicates the case where the heat insulating coat 41 is not provided on the inner wall of the pipe 16, and the distributor outlet inner wall temperature DOWN 2 indicates the case where the heat insulating coat 41 is provided on the inner wall of the pipe 16.
  • the cooling water temperature THW reaches the EGR start temperature T1 (for example, “40 ° C.”) at time t2, the EGR valve 14 and the bypass valve 24 are opened (in this case, the bypass valve is opened at time t5).
  • T1 for example, “40 ° C.”
  • the bypass valve is opened at time t5
  • EGR gas flows through the EGR passage 12, so that various temperatures other than the cooling water temperature THW, PIG, PIW1, PIW2, DOG1, DOG2, DOW1, and DOW2, also start to raise the temperature.
  • the pipe inlet gas temperature PIG rises higher than the others toward time t7.
  • the pipe inlet inner wall temperatures PIW1 and PIW2 become higher than the aromatic nylon heat resistant temperature T5, which is higher than the other temperatures T0 to T4, at time t7.
  • the pipe inlet inner wall temperature PIW1 when the heat insulating coat 41 is not provided is higher than the pipe inlet inner wall temperature PIW2 when the heat insulating coat 41 is provided.
  • the distributor outlet inner wall temperatures DOW1 and DOW2 are higher than the dew point temperature T2 at time t7, and the distributor outlet gas temperatures DOG1 and DOG2 are higher than the engine thermo temperature T3 at time t7, 66 nylon.
  • the heat resistant temperature is lower than T4.
  • the distributor outlet inner wall temperature DOWN2 and the distributor outlet gas temperature DOG2 when the heat insulating coat 41 is provided are higher than the distributor outlet inner wall temperature DOWN1 and the distributor outlet gas temperature DOG1 when the heat insulating coat 41 is not provided. Will also be higher. From this, it can be seen that the temperature drop of the EGR gas flowing to the EGR gas distributor 15 can be suppressed more when the heat insulating coat 41 is provided.
  • the distributor outlet inner wall temperature DOWN1 when the heat insulating coat 41 is not provided reaches the dew point temperature T2 at the time between the time t6 and the time t7, whereas the distributor outlet when the heat insulating coat 41 is provided.
  • the inner wall temperature DOWN2 has reached the dew point temperature T2 at a time between time t3 and time t4. From this, it can be seen that when the heat insulating coat 41 is provided, the EGR gas can be returned to each cylinder of the engine 1 from an earlier time after the engine is started without generating condensed water in the EGR gas distributor 15.
  • the bypass valve 24 is opened at time t2 and at time t5 as shown in FIG. I was able to close the valve.
  • the high-temperature EGR gas can flow for a long time through the bypass passage 21g without melting the resin flow path 34 and the pipe 16 due to overheating, and the apparent heat resistance of the flow path 34 and the pipe 16 is improved. I was able to make it.
  • the bypass valve 24 is closed at the latest at time t3 in order to suppress melting damage due to overheating of the flow path 34 and the pipe 16. Therefore, the time for the high temperature EGR gas to flow to the flow path 34 and the pipe 16 is shortened by the earlier the time to close the bypass valve 24.
  • FIG. 7 shows the configuration from the pipe 16 to the EGR gas distributor 15 by a configuration diagram according to FIG.
  • FIG. 8 shows the pipe 16 in a cross-sectional view according to FIG.
  • the thickness of the heat insulating coat 41 is formed to be different between the upstream portion US, the middle flow portion MS, and the downstream portion DS of the pipe 16.
  • the thickness of the heat insulating coat 41 is the smallest in the downstream portion DS (downstream side) of the pipe 16, and gradually increases in the order of the middle flow portion MS and the upstream portion US (upstream side). That is, the heat insulating coat 41 is formed so that its thickness gradually increases from the downstream portion DS (downstream side) to the upstream portion US (upstream side) of the pipe 16.
  • FIGS. 7 and 8 it is exaggerated to clarify the stepwise change in the thickness of the heat insulating coat 41.
  • it is desirable that the thickness of the heat insulating coat 41 is thicker than that of other portions at the corner portion of the pipe 16 surrounded by the two-dot chain line S1 in FIG. 7.
  • the thickness of the heat insulating coat 41 provided on the inner wall of the flow path 34 of the EGR valve 14 is the thickness of the heat insulating coat 41 of the upstream portion US of the pipe 16. Can be the same as or larger than that.
  • the heat insulating coat 41 is formed so that its thickness gradually increases from the downstream portion DS (downstream side) to the upstream portion US (upstream side) of the pipe 16.
  • the temperature of the EGR gas flowing through the pipe 16 is high in the upstream portion US of the pipe 16, and decreases toward the middle flow portion MS and the downstream portion DS. Therefore, the heat insulating property of the pipe 16 is set from the upstream portion US to the downstream portion DS according to the temperature change of the EGR gas flowing therethrough. Therefore, the EGR gas can be effectively kept warm from the upstream portion US to the downstream portion DS of the pipe 16 in accordance with the temperature change of the EGR gas flowing through the pipe 16, and the heat resistance of the pipe 16 can be effectively secured.
  • FIG. 9 shows the configuration from the EGR cooler 13 to the EGR gas distributor 15 by a configuration diagram according to FIG. 2.
  • an assembly portion 21h for assembling the EGR valve 14 is provided in the flow path portion 21f of the casing 21 of the EGR cooler 13, and the EGR valve is provided in the hole of the assembly portion 21h.
  • the housing 46 of 14 By incorporating (drop-in) the housing 46 of 14, the EGR valve 14 is attached to the EGR cooler 13.
  • the housing 46 of the EGR valve 14 is made of a resin material having a function of retaining heat of the EGR gas, and is provided with a flow path 34 and a valve seat 35 on which the valve body 36 is seated.
  • the inlet 16a of the pipe 16 made of a resin material is connected to the outlet 21c of the EGR cooler 13.
  • a heat insulating coat 41 shown by a broken line is provided on the inner wall of the pipe 16.
  • the heat insulating coat 41 is formed to have a uniform thickness from the upstream side to the downstream side of the pipe 16, or is formed so as to gradually or gradually increase from the downstream side to the upstream side of the pipe 16. be able to. Further, the thickness of the heat insulating coat 41 can be made particularly thicker at the corner portion of the pipe 16 than at other portions.
  • the flow path 34 of the EGR valve 14 includes an inlet 34a and an outlet 34b, and the inlet 34a of the flow path 34 is arranged substantially adjacent to the outlet 23b of the heat exchanger 23.
  • the inlet 34a of the flow path 34 of the EGR valve 14 is arranged substantially adjacent to the outlet 23b of the heat exchanger 23, it has just flowed out from the outlet 23b of the heat exchanger 23.
  • the EGR gas flows into the inlet 34a of the resin flow path 34 of the EGR valve 14 at an early stage. Therefore, the temperature drop of the EGR gas that has just flowed out from the outlet 23b of the heat exchanger 23 can be suppressed by the flow path 34 of the EGR valve 14.
  • FIG. 10 shows the configuration from the EGR cooler 13 to the EGR gas distributor 15 with a configuration diagram according to FIG. 2.
  • an assembly portion 15c for assembling the EGR valve 14 is provided on the inlet side of the EGR gas distributor 15 made of a resin material, and a hole of the assembly portion 15c is provided.
  • the EGR valve 14 is attached to the EGR gas distributor 15 by incorporating the housing 46 of the EGR valve 14 into the EGR valve 14 (drop-in).
  • the housing 46 of the EGR valve 14 is made of a resin material having a function of retaining heat of the EGR gas, and is provided with a flow path 34 and a valve seat 35 on which the valve body 36 is seated.
  • An inlet 15d is provided at the bottom of the assembly portion 15c made of a resin material, and the outlet 16b of the pipe 16 is connected to the inlet 15d.
  • a heat insulating coat 41 shown by a broken line is provided on the inner wall of the pipe 16 and the inner wall of the flow path 34 of the housing 46. Also in this embodiment, the heat insulating coat 41 is formed to have a uniform thickness from the upstream side to the downstream side of the pipe 16, or is formed so as to gradually or gradually increase from the downstream side to the upstream side of the pipe 16. You can also do it.
  • FIG. 11 shows a cross-sectional view of the pipe 16 cut in a direction orthogonal to the longitudinal direction thereof.
  • the heat insulating means of this embodiment is composed of a heating unit 50 for heating the pipe 16 (middle flow passage unit MSP).
  • the heating unit 50 is provided on the inner wall of the pipe 16 made of a resin material, and is composed of a heat generating film 51 that generates heat by energization.
  • MSP middle flow passage unit
  • a positive electrode 53 having a positive terminal 53a and a negative electrode 54 having a negative terminal 54a are connected to the heat generating film 51. Then, the heat generating film 51 is energized from the positive terminal 53a and the negative terminal 54a via the positive electrode 53 and the negative electrode 54.
  • the following actions and effects can be obtained in addition to the actions and effects substantially equivalent to those of the first embodiment. That is, since the heat retaining means is the heating unit 50, by heating the pipe 16 constituting the middle flow passage portion MSP by the heating unit 50, both the heat retention and the temperature rise of the pipe 16 become possible. More specifically, by generating heat by energizing the heating film 51 via the positive electrode 53 and the negative electrode 54, the inner wall of the pipe 16 (middle flow passage portion MSP) is heated over a wide area at an arbitrary timing. To. Therefore, the EGR gas flowing through the pipe 16 can be effectively kept warm. Further, the EGR gas flowing through the pipe 16 can be responsively and stably kept warm. As a result, the EGR gas flowing to the EGR gas distributor 15 can be effectively kept warm.
  • FIG. 12 shows a cross-sectional view of the pipe 16 cut in a direction orthogonal to the longitudinal direction thereof.
  • the heat insulating means of this embodiment is composed of an air layer 56 provided on the outside of a pipe 16 (middle flow passage portion MSP) made of a resin material having a function of keeping heat of EGR gas. ..
  • the pipe 16 has a double pipe structure formed by the outer pipe 16c and the inner pipe 16d, and an air layer 56 is formed between the two pipes 16c and 16d.
  • the following actions and effects can be obtained in addition to the actions and effects substantially equivalent to those of the first embodiment. That is, since the heat insulating means is the air layer 56, it is not necessary to use a special member for the heat insulating means. Therefore, the number of parts constituting the EGR device 11 can be reduced by the amount of the heat insulating means. The air layer 56 can also effectively keep the EGR gas flowing through the pipe 16 warm.
  • FIG. 13 shows the configuration from the EGR cooler 13 to the EGR gas distributor 15 by a configuration diagram according to FIG. 2.
  • this embodiment differs from the first embodiment in that a cooling unit 58 for cooling a part of the bypass passage 21g is further provided.
  • the cooling unit 58 is provided around a part of the bypass passage 21g in the longitudinal direction so that the cooling water of the engine 1 circulates.
  • the EGR device 11 of this embodiment in addition to the same actions and effects as those of the first embodiment, the following actions and effects can be obtained. That is, in this embodiment, since the EGR gas flowing through the bypass passage 21g is cooled by the cooling unit 58, the EGR gas flowing from the bypass passage 21g into the flow path 34 of the EGR valve 14 and the pipe 16 (middle flow passage portion MSP). The temperature drops. Therefore, the temperature of the EGR gas can be brought close to the heat resistant temperature of the resin material constituting the flow path 34 and the pipe 16 (middle flow passage portion MSP), and even if the high temperature EGR gas flows through the bypass passage 21 g, the EGR gas can be brought close to the heat resistant temperature. It is possible to suppress melting damage due to overheating of the flow path 34 and the pipe 16 (middle flow passage portion MSP) due to gas.
  • FIG. 14 shows the configuration from the EGR cooler 13 to the EGR gas distributor 15 with a configuration diagram according to FIG. 2.
  • a heat insulating coat 41 as a heat insulating means is provided on the inner wall of the flow path 34 of the EGR valve 14 and the inner wall of the pipe 16 made of a resin material (66 nylon).
  • the flow path 34 and the pipe 16 of the EGR valve 14 are made of a resin material having a function of retaining heat of the EGR gas (for example, "aromatic".
  • the heat insulating means is configured by forming it from "nylon").
  • the inner housing 39 and the flow path member 40 are formed of, for example, aromatic nylon.
  • the following actions and effects can be obtained in addition to the actions and effects substantially equivalent to those of the first embodiment. That is, when the resin material constituting the flow path 34 and the pipe 16 of the EGR valve 14 is made of, for example, aromatic nylon, the heat resistant temperature of the aromatic nylon is higher than that of 66 nylon, so that the flow path 34 and the pipe The heat retaining property is obtained in the 16 itself, and it is not necessary to separately provide a heat retaining means. Therefore, it is possible to facilitate the manufacture of the EGR device 11 provided with the heat insulating means.
  • FIG. 15 shows the configuration from the EGR cooler 13 to the EGR gas distributor 15 with a configuration diagram according to FIG.
  • the inner wall of the flow path 34 of the EGR valve 14 is made of a resin material
  • the inner wall of the pipe 16 (middle flow passage portion MSP) made of the resin material is provided with a heat insulating coat 41 as a heat insulating means.
  • the hot water passage 61 through which hot water flows along the longitudinal direction of the flow path of the pipe 16 is provided. It is formed.
  • engine cooling water as hot water warmed by cooling the engine 1 flows through the hot water passage 61.
  • the hot water passage 61 includes an inlet 61a provided in the vicinity of the inlet 16a of the pipe 16 and an outlet 61b provided in the vicinity of the outlet 16b of the pipe 16. The engine cooling water flows into the hot water passage 61 from the inlet 61a and flows out from the outlet 61b.
  • the pipe 16 shows the pipe 16 with a cross-sectional view taken along the line CC of FIG.
  • the pipe 16 of this embodiment has a double pipe structure, includes an outer outer pipe 16c and an inner inner pipe 16d sandwiching the hot water passage 61, and they are not divided. It is formed integrally.
  • the thickness of the outer tube 16c is larger than the thickness of the inner tube 16d.
  • the hot water passage 61 corresponds to an example of the heating unit 50 of this disclosed technique.
  • the EGR valve 14 and the pipe 16 are the valve outlet flange 21i provided at the outlet 21c of the casing 21 on the outlet side of the EGR valve 14, and the inlet of the pipe 16. It is connected via a pipe inlet flange 16e provided on the side.
  • the pipe 16 and the EGR gas distributor 15 (downstream passage portion DSP) are provided with a pipe outlet flange 16f provided on the outlet side of the pipe 16 and a distributor inlet flange 15e provided on the inlet side of the EGR gas distributor 15. It is connected via the passage portion entrance flange).
  • the EGR device 11 of this embodiment it is possible to obtain almost the same operation and effect as that of the fifth embodiment. That is, in the EGR device 11 of this embodiment, since the heat insulating means of the pipe 16 constituting the middle flow passage portion MSP is the heating unit 50, the pipe 16 is heated by the heating unit 50 to keep the pipe 16 warm. And temperature rise are possible. More specifically, the engine cooling water (hot water) flows through the hot water passage 61, so that the inner wall of the pipe 16 (middle flow passage portion MSP) is heated widely in terms of surface. Therefore, the EGR gas flowing through the pipe 16 can be effectively kept warm. Further, the EGR gas flowing through the pipe 16 can be responsively and stably kept warm. As a result, the EGR gas flowing to the EGR gas distributor 15 can be effectively kept warm.
  • the engine cooling water hot water
  • the heating unit 50 is composed of the hot water passage 61 through which the hot water flows, the engine cooling water warmed by cooling the engine 1 is used as hot water and flows to the hot water passage 61. It becomes possible. Therefore, unlike the fifth embodiment, heating can be performed without using an electric configuration. Further, even if the flow of the EGR gas in the pipe 16 is stopped, the heating of the pipe 16 is continued by the hot water in the hot water passage 61. Therefore, when the EGR gas flows through the pipe 16 again, the condensed water in the pipe 16 is continued. Occurrence can be suppressed.
  • the thickness of the outer pipe 16c sandwiching the hot water passage 61 is larger than the thickness of the inner pipe 16d, so that the heat of the hot water is the inner pipe 16d. It is easily transmitted to the inner wall and difficult to escape to the outer wall of the outer pipe 16c. Therefore, the heatability and heat retention of the EGR gas flowing inside the inner tube 16d can be enhanced.
  • the hot water passage 61 is provided along the flow path longitudinal direction of the pipe 16 (middle flow passage portion MSP), the EGR gas is warmed long along the flow of the EGR gas in the pipe 16. Will be. In this sense as well, the heatability and heat retention of the EGR gas flowing through the pipe 16 can be further enhanced.
  • FIG. 17 shows the configuration of the pipe 16 in a cross-sectional view according to FIG.
  • the pipe 16 of this embodiment is configured by joining the upper pipe portion 62 forming the upper side thereof and the lower pipe portion 63 forming the lower side thereof.
  • the hot water passage 61 is formed only in the lower pipe portion 63, and the hot water passage 61 is not formed in the upper pipe portion 62. That is, the lower pipe portion 63 is formed by the outer pipe 16c and the inner pipe 16d sandwiching the hot water passage 61.
  • the upper pipe portion 62 has an outer diameter equivalent to that of the inner pipe 16d of the lower pipe portion 63, and a flange 62a is formed at the joint portion with the lower pipe portion 63 along the longitudinal direction thereof. Then, the flange 62a of the upper pipe portion 62 and the upper end surface 63a of the lower pipe portion 63 are joined by welding 64 to form the pipe 16.
  • the hot water passage 61 is provided on the lower side of the pipe 16, but by arranging the upper pipe portion 62 and the lower pipe portion 63 upside down in FIG. 17, the hot water passage 61 is provided on the upper side of the pipe 16. You can also do it.
  • FIG. 18 shows the configuration from the EGR cooler 13 to the EGR gas distributor 15 with a configuration diagram according to FIG.
  • the hot water passage 61 through which hot water flows along the longitudinal direction of the pipe 16 (middle flow passage portion MSP) made of a resin material is formed in a double pipe structure. It was formed integrally.
  • the hot water passage 61 is composed of a metal pipe 66 having a circular cross section provided along the longitudinal direction of the flow path of the pipe 16.
  • the metal pipe 66 is fixed to the resin pipe 16 by insert molding.
  • FIG. 19 shows the pipe 16 with a cross-sectional view taken along the line DD of FIG.
  • the pipe 16 of this embodiment includes an upper pipe portion 62 and a lower pipe portion 63, and both 62 and 63 have substantially the same outer diameter.
  • Flange 62a and 63b are formed in the upper pipe portion 62 and the lower pipe portion 63, respectively, along the longitudinal direction.
  • one metal pipe 66 is fixed by insert molding only to the lower pipe portion 63, and the metal pipe is not fixed to the upper pipe portion 62.
  • the metal pipe 66 is insert-molded so that the entire metal pipe 66 is completely covered with the resin material by the lower pipe portion 63.
  • the metal pipe 66 can be made of, for example, an aluminum pipe or an iron-plated pipe.
  • the hot water passage 61 is composed of the metal pipe 66 provided along the longitudinal direction of the flow path of the pipe 16 (middle flow passage portion MSP), the hot water passage 61 is cracked due to disturbance. On the other hand, it is more advantageous than the resin material. Therefore, the durability of the hot water passage 61 can be enhanced.
  • the metal pipe 66 is fixed to the pipe 16 (middle flow passage portion MSP) by insert molding, the adhesion of the metal pipe 66 to the pipe 16 is improved, and the metal pipe 66 is connected to the metal pipe 66.
  • the contact area with the pipe 16 becomes large. Therefore, it is possible to improve the heatability and heat retention of the EGR gas flowing through the pipe 16 by the engine cooling water (hot water) of the hot water passage 61. Further, since the metal pipe 66 is not exposed from the inner wall of the pipe 16, it is possible to prevent the metal pipe 66 from being corroded by the condensed water.
  • the metal pipe 66 since the hot water passage 61 is formed by the metal pipe 66, the metal pipe 66 is not cracked due to disturbance, and the engine cooling water flowing through the hot water passage 61 is the pipe 16. There is no risk of leaking inward. Further, as shown in FIG. 19, by not exposing the metal pipe 66 from the inner wall of the pipe 16, the metal pipe 66 is completely covered with the resin material, so that the condensed water generated inside the pipe 16 becomes the metal pipe 66. There is no contact. Further, since the metal pipe 66 can be made of, for example, an aluminum pipe or an iron-plated pipe, the manufacturing cost can be suppressed.
  • the metal pipe 66 since a part of the metal pipe 66 is bent and insert-molded into the pipe 16, the metal pipe 66 is positioned with respect to the pipe 16. Therefore, it is possible to prevent the metal pipe 66 from being displaced in the pipe 16.
  • FIG. 20 shows the pipe 16 in a cross-sectional view according to FIG.
  • two metal pipes 66 having a circular cross section are arranged in parallel only on the lower pipe portion 63 and fixed by insert molding.
  • Other configurations are the same as those of the eleventh embodiment.
  • the following actions and effects can be obtained in addition to the actions and effects of the eleventh embodiment. That is, in this embodiment, two metal pipes 66 having a circular cross section are arranged in parallel only on the lower pipe portion 63 and fixed by insert molding, thereby forming a hot water passage 61. Therefore, the area of the hot water passage 61 in contact with the pipe 16 increases. Therefore, the heatability and heat retention of the EGR gas flowing through the pipe 16 by the engine cooling water (hot water) of the hot water passage 61 can be further improved.
  • FIG. 21 shows the pipe 16 in a cross-sectional view according to FIG.
  • one metal pipe 67 having an elliptical cross section is arranged only in the lower pipe portion 63 and fixed by insert molding.
  • the major axis of the metal pipe 67 is set to be about twice the outer diameter of the metal pipe 66, and is arranged parallel to the horizontal direction of the pipe 16.
  • the minor diameter of the metal pipe 67 is set to be substantially the same as the outer diameter of the metal pipe 66, and is arranged in parallel with the vertical direction of the pipe 16.
  • Other configurations are the same as those of the eleventh and twelfth embodiments.
  • FIG. 22 shows the pipe 16 in a cross-sectional view according to FIG.
  • one metal pipe 66 having a circular cross section is inserted and fixed only to the lower pipe portion 63.
  • a metal heat sink 68 having a cross-sectional waveform is provided on the upper side of the metal pipe 66 so as to be in contact with the metal pipe 66, and the heat sink 68 is integrally piped with the metal pipe 66. It is fixed by being insert-molded into.
  • the width of the heat sink 68 is preferably three times or more the outer diameter of the metal pipe 66.
  • Other configurations are the same as those of the ninth embodiment.
  • one metal pipe 66 and the heat radiating plate 68 in contact with the metal pipe 66 are integrally fixed to the lower pipe portion 63 of the pipe 16 by insert molding. Therefore, in addition to the operation and effect of the ninth embodiment, the heat dissipation characteristic from the metal pipe 66 to the pipe 16 can be improved by the heat sink 68.
  • FIG. 23 shows the pipe 16 in a cross-sectional view according to FIG.
  • one metal pipe 66 having a circular cross section is inserted and fixed only to the lower pipe portion 63.
  • the upper side of the metal pipe 66 is exposed and arranged inside the pipe 16, that is, in the flow path through which the EGR gas flows.
  • the metal pipe 66 of this embodiment is formed of SUS to prevent rust.
  • Other configurations are the same as those of the ninth embodiment.
  • one metal pipe 66 is insert-molded only in the lower pipe portion 63, and the upper side of the metal pipe 66 is exposed and arranged in the inner flow path of the pipe 16. Will be done. Therefore, in this embodiment, in addition to the operation and effect of the ninth embodiment, the heat of the hot water passage 61 can be directly transferred to the EGR gas flowing inside the pipe 16, and the metal pipe 66 to the pipe 16 can be directly transferred. It is possible to improve the heat dissipation characteristics to.
  • FIG. 24 shows a part of the pipe 16 to which the metal pipe 66 is fixed by a side view.
  • FIG. 25 shows the pipe 16 to which the metal pipe 66 is fixed by the cross-sectional view taken along the line EE of FIG. 24.
  • the lower pipe portion 63 of the pipe 16 (middle flow passage portion MSP) has a plurality of pipe holders for holding one metal pipe 66 along the longitudinal direction of the flow path. 71 is formed integrally with the pipe 16. As shown in FIG.
  • each pipe holder 71 is configured as a set of a pair of claw portions 71a so as to sandwich the outer periphery of the metal pipe 66 from both sides.
  • the space between the two claws 71a opens downward, and the metal pipe 66 is fitted between the two claws 71a.
  • the metal pipe 66 is held by the pipe holder 71 with respect to the lower pipe portion 63 and is fixed. In this fixed state, the metal pipe 66 is in contact with the lower outer wall of the lower pipe portion 63.
  • the pipe holder 71 corresponds to an example of a holding means in the disclosed technique.
  • the contact area of the metal pipe 66 with respect to the pipe 16 is inferior to that of the insert molding of the eleventh embodiment, but other than that, almost the same operation and effect as those of the eleventh embodiment are obtained. be able to.
  • the metal pipe 66 is fixed by being held by the pipe holder 71 (holding means) along the flow path longitudinal direction of the pipe 16 (middle flow passage portion MSP).
  • the pipe holder 71 holding means
  • MSP middle flow passage portion
  • FIG. 26 shows a part of the pipe 16 to which the metal pipe 66 is fixed by a side view.
  • FIG. 27 shows a pipe 16 to which the metal pipe 66 is fixed by a sectional view taken along the line FF of FIG. 26.
  • a pipe holder 73 for holding one metal pipe 66 is provided in the lower pipe portion 63 of the pipe 16 (middle flow passage portion MSP) along the longitudinal direction thereof. ..
  • FIG. 26 shows a pipe holder 73 for holding one metal pipe 66 in the lower pipe portion 63 of the pipe 16 (middle flow passage portion MSP) along the longitudinal direction thereof.
  • the pipe holder 73 receives the lower receiving portion 74 for receiving the lower part of the metal pipe 66, the upper receiving portion 75 for receiving the upper side of the metal pipe 66, and the lower receiving portion 74. It is composed of a plurality of clips 76 for fixing to 75.
  • the lower receiving portion 74 extends along the longitudinal direction of the metal pipe 66 to receive the lower side of the metal pipe 66, has an arcuate cross section, and has flanges 74a on both sides.
  • the upper receiving portion 75 projects downward from the lower pipe portion 63 to receive the upper side of the metal pipe 66, extends along the longitudinal direction of the metal pipe 66, has a recess 75a having an arcuate cross section, and has flanges 75b on both sides. Is formed.
  • the upper half of the metal pipe 66 is fitted into the recess 75a of the upper receiving portion 75, the lower half thereof is covered with the lower receiving portion 74, and the flanges 74a and 75b thereof are sandwiched by a plurality of clips 76. It is fixed to the pipe 16. In this fixed state, the metal pipe 66 is in contact with the lower outer wall of the lower pipe portion 63.
  • the pipe holder 73 corresponds to an example of a holding means in the disclosed technique.
  • the contact area of the metal pipe 66 with respect to the pipe 16 is inferior to that of the insert molding of the eleventh embodiment, but other than that, almost the same operation and effect as those of the eleventh embodiment are obtained. be able to.
  • FIG. 28 shows the pipe 16 to which the metal pipe 66 is fixed by a cross-sectional view according to FIG. 25.
  • the metal pipe 66 held by the pipe holder 71 (holding means) and the lower pipe portion 63 of the pipe 16 extend along the metal pipe 66 and have thermal conductivity.
  • a good heat transfer sheet 77 is provided.
  • the heat transfer sheet 77 is formed of a flexible sheet material (for example, a rubber sheet). This embodiment differs from the 16th embodiment in this respect.
  • the heat transfer sheet 77 corresponds to an example of a heat transfer member in the disclosed technique.
  • the following actions and effects can be obtained in addition to the actions and effects of the 16th embodiment. That is, in this embodiment, the heat transfer sheet 77 is sandwiched between the metal pipe 66 held by the pipe holder 71 (holding means) and the lower pipe portion 63 (middle flow passage portion MSP) of the pipe 16. Therefore, there is no gap between the metal pipe 66 and the lower pipe portion 63, and the adhesion between the two 66 and 63 is improved.
  • the heat transfer property to the inner wall of the lower pipe portion 63 by the hot water flowing through the hot water passage 61 in the metal pipe 66 can be improved, the temperature rise property of the inner wall can be improved, and the inside of the pipe 16 can be improved. It is possible to improve the temperature rise property of the EGR gas flowing through the water.
  • the configuration of this embodiment even if a thermal expansion difference occurs between the metal pipe 66 and the lower pipe portion 63 due to the flexibility of the heat transfer sheet 77, heat transfer between the metal pipe 66 and the lower pipe portion 63 and the heat transfer portion 63. Adhesion with the sheet 77 is ensured. In this sense, the heat transfer property of the hot water flowing through the hot water passage 61 to the inner wall of the lower pipe portion 63 can be further improved, the temperature rise property of the inner wall can be further improved, and the EGR flowing inside the pipe 16 can be further improved. The temperature rise property of the gas can be further improved.
  • FIG. 29 shows the pipe 16 to which the metal pipe 66 is fixed by a cross-sectional view according to FIG. 27.
  • the metal pipe 66 is formed between the metal pipe 66 held by the pipe holder 73 (holding means) and the lower pipe portion 63 (middle flow passage portion MSP) of the pipe 16.
  • a heat transfer sheet 77 that extends along the line and has good thermal conductivity is provided.
  • the heat transfer sheet 77 corresponds to an example of a heat transfer member in the disclosed technique.
  • the following actions and effects can be obtained in addition to the actions and effects of the 17th embodiment. That is, in this embodiment, the heat transfer sheet 77 is sandwiched between the metal pipe 66 held by the pipe holder 73 (holding means) and the lower pipe portion 63 (middle flow passage portion MSP), so that the metal is provided. There is no gap between the pipe 66 and the lower pipe portion 63, and the adhesion between the two 66 and 63 is improved. Therefore, it is possible to improve the temperature rise property of the inner wall of the lower pipe portion 63 by the hot water flowing through the hot water passage 61 in the metal pipe 66, and improve the temperature rise property of the EGR gas flowing inside the pipe 16. can.
  • FIG. 30 shows the pipe 16 to which the metal pipe 66 is fixed by a cross-sectional view according to FIG. 28.
  • the metal pipe 66 is held by the pipe holder 71 (holding means) in the lower pipe portion 63 (middle flow passage portion MSP) of the pipe 16, and the metal pipe 66 is a heat transfer sheet.
  • a gap 78 is provided between the claw portion 71a of the pipe holder 71 and the metal pipe 66.
  • the gap 78 constitutes an example of an air layer (heat insulating layer) in the disclosed technique.
  • this embodiment is different from the eighteenth embodiment.
  • the following actions and effects can be obtained in addition to the actions and effects of the 18th embodiment. That is, in this embodiment, the heat transfer sheet 77 is sandwiched between the metal pipe 66 and the lower pipe portion 63 in a state where the metal pipe 66 is held by the pipe holder 71, but the claw portion 71a and the metal pipe 66 A gap 78 is provided between the two. Therefore, when the engine is stopped, the heat escape from the metal pipe 66 to the atmosphere side is suppressed by the gap 78. Therefore, when the engine is stopped, it is possible to suppress a decrease in temperature of the inner wall of the pipe 16 (middle flow passage portion MSP).
  • FIG. 31 shows the pipe 16 to which the metal pipe 66 is fixed by a cross-sectional view according to FIG. 29.
  • the metal pipe 66 is held by the pipe holder 73 (holding means) in the lower pipe portion 63 (middle flow passage portion MSP) of the pipe 16, and the metal pipe 66 is a heat transfer sheet.
  • a gap 78 air layer (heat insulating layer)
  • this embodiment is different from the 19th embodiment.
  • the following actions and effects can be obtained in addition to the actions and effects of the 19th embodiment. That is, in this embodiment, the heat transfer sheet is held between the metal pipe 66 and the lower pipe portion 63 (middle flow passage portion MSP) of the pipe 16 in a state where the metal pipe 66 is held by the pipe holder 73 (holding means). 77 is sandwiched, but a gap 78 is mainly provided between the lower receiving portion 74 and the metal pipe 66. Therefore, when the engine is stopped, the heat escape from the metal pipe 66 to the atmosphere side is suppressed by the gap 78.
  • MSP middle flow passage portion
  • the temperature drop of the inner wall of the pipe 16 can be suppressed.
  • hot water does not flow through the hot water passage 61 of the metal pipe 66, but the hot water stays, so that the staying hot water becomes a heat source. Since the heat escape from the metal pipe 66 is suppressed, the temperature drop of the inner wall of the pipe 16 can be effectively suppressed. Even during engine operation, the gap 78 suppresses the escape of heat from the metal pipe 66 to the atmosphere side, and the temperature drop of the inner wall of the pipe 16 can be suppressed.
  • FIG. 32 shows a part of the pipe 16 to which the metal pipe 66 is fixed by a side view.
  • FIG. 33 shows a pipe 16 to which the metal pipe 66 is fixed by a sectional view taken along the line GG of FIG. 32.
  • heat is generated between the metal pipe 66 held by the pipe holder 71 (holding means) and the lower pipe portion 63 (middle flow passage portion MSP) of the pipe 16.
  • a heat transfer plate 79 having good conductivity is provided.
  • this embodiment is different from the 18th embodiment in which the heat transfer sheet 77 is provided.
  • the heat transfer plate 79 corresponds to an example of a heat transfer member in the disclosed technique.
  • the heat transfer plate 79 is a metal plate and has a larger area than the heat transfer sheet 77 in order to expand the heat transfer range from the metal pipe 66 to the lower pipe portion 63.
  • the heat transfer plate 79 is sandwiched between the metal pipe 66 and the lower pipe portion 63, and is sandwiched between the main trunk portion 79a extending along the metal pipe 66 and the adjacent pipe holder 71 between the main trunk portion 79a and the lower pipe portion 63. Includes a wing 79b extending along the outer wall of the.
  • the main trunk portion 79a exerts the same function as the above-mentioned heat transfer sheet 77, but the wing portion 79b exerts a function of transferring the heat transferred from the metal pipe 66 to the heat transfer plate 79 to the outer wall of the lower pipe portion 63. ..
  • the following actions and effects can be obtained in addition to the actions and effects of the 18th embodiment. That is, in this embodiment, the heat transferred from the metal pipe 66 to the heat transfer plate 79 is further transferred to the outer wall of the lower pipe portion 63 via the blade portion 79b. Therefore, the temperature riser of the lower pipe portion 63 can be further improved by the amount of heat transferred to the outer wall of the lower pipe portion 63, and the temperature riser of the EGR gas flowing inside the pipe 16 can be further improved. ..
  • FIG. 34 shows a part of the pipe 16 to which the metal pipe 66 is fixed by a side view.
  • FIG. 35 shows the pipe 16 to which the metal pipe 66 is fixed by the cross-sectional view taken along the line HH of FIG. 34.
  • heat is generated between the metal pipe 66 held by the pipe holder 73 (holding means) and the lower pipe portion 63 (middle flow passage portion MSP) of the pipe 16.
  • a heat transfer plate 79 having good conductivity is provided.
  • This embodiment differs from the 19th embodiment in which the heat transfer sheet 77 is provided in this respect.
  • the heat transfer plate 79 corresponds to an example of a heat transfer member in the disclosed technique.
  • the heat transfer plate 79 is sandwiched between the metal pipe 66 and the lower pipe portion 63, and is between the main trunk portion 79a extending along the metal pipe 66 and the adjacent pipe holder 73. Includes a wing portion 79b extending from the main trunk portion 79a along the outer wall of the lower pipe portion 63.
  • the main trunk portion 79a exerts the same function as the above-mentioned heat transfer sheet 77, but the wing portion 79b exerts a function of transferring the heat transferred from the metal pipe 66 to the heat transfer plate 79 to the outer wall of the lower pipe portion 63. ..
  • the following actions and effects can be obtained in addition to the actions and effects of the 19th embodiment. That is, in this embodiment, the heat transferred from the metal pipe 66 to the heat transfer plate 79 is further transferred to the outer wall of the lower pipe portion 63 via the blade portion 79b. Therefore, the temperature riser of the lower pipe portion 63 can be further improved by the amount of heat transferred to the outer wall of the lower pipe portion 63, and the temperature riser of the EGR gas flowing inside the pipe 16 can be further improved. ..
  • FIG. 36 shows the configuration from the EGR cooler 13 to the EGR gas distributor 15 by a configuration diagram according to FIG.
  • the hot water passage 61 is provided along the flow path longitudinal direction of the pipe 16.
  • the inlet side heating spacer 81 is provided sandwiched between the valve outlet flange 21i and the pipe inlet flange 16e.
  • an outlet side heating spacer 82 is provided so as to be sandwiched between the pipe outlet flange 16f and the distributor inlet flange 15e.
  • a hot water passage 61 is provided along the circumferential direction of each of the heating spacers 81 and 82. Cooling water (hot water) that has cooled the engine 1 flows through the hot water passage 61 of the inlet side heating spacer 81 and the hot water passage 61 of the outlet side heating spacer 82.
  • the hot water passage 61 of the inlet side heating spacer 81 and the hot water passage 61 of the outlet side heating spacer 82 are connected by a hot water pipe 83, and the hot water flowing through the hot water passage 61 on the inlet side passes through the hot water pipe 83 to the hot water on the outlet side. It is designed to flow to the passage 61.
  • the heating spacers 81 and 82 are each made of a resin material.
  • the heat of the hot water flowing through the hot water passages 61 of the heating spacers 81 and 82 passes through the front and rear flanges 21i, 16e, 16f and 15e via the heating spacers 81 and 82, and the flow path portion 21f of the casing 21 ( EGR valve 14 outlet side), the inlet 16a and outlet 16b of the pipe 16, and the inlet 15d of the EGR gas distributor 15, and their inner walls are heated. Therefore, the EGR gas flowing through each portion 21i, 16e, 16f, 15e, 21f, 16a, 16b, 15d of the middle flow passage portion MSP adjacent to each heating spacer 81, 82 can be effectively kept warm.
  • FIG. 37 is a cross-sectional view showing a connection portion between the metal upstream pipe 85 and its outlet flange 85a and the resin downstream pipe 86 and its inlet flange 86a, which are the objects of measurement according to this embodiment. ..
  • a metal flow path portion 21f and a valve outlet flange 21i are assumed.
  • FIG. 38 is a cross-sectional view showing a connection portion between the metal upstream pipe 85 and its outlet flange 85a and the metal downstream pipe 87 and its inlet flange 87a, which are in inverse proportion to each other and are measurement targets.
  • the metal downstream side pipe 87 and its inlet flange 87a it is assumed that the inlet side heating spacer 81, the pipe inlet flange 16e, and the pipe 16 are made of metal.
  • a hot water passage 61 is formed in the inlet flange 87a.
  • hot water of "60 ° C.” flows through the hot water passage 61 of FIGS. 37 and 38, and the temperature of the outside air around the hot water passage 61 is, for example, "25 ° C.”.
  • FIG. 39 shows (A) changes in engine speed (EGR flow rate) and (B) changes in various temperatures by time charts.
  • the thick solid line shows the temperature of hot water (first hot water temperature) TW1 flowing through the hot water passage 61 of the resin inlet flange 86a, and the solid line shows the hot water passage 61 flowing through the hot water passage 61 of the metal inlet flange 87a.
  • the temperature of hot water (second hot water temperature) TW2 is shown, the thick broken line shows the temperature of the inner wall of the resin inlet flange 86a (first inner wall temperature) TI1, and the broken line shows the temperature of the inner wall of the metal inlet flange 87a.
  • the thick one-point chain wire indicates the temperature of EGR gas flowing inside the resin inlet flange 86a (first EGR gas temperature) TG1, and the one-point chain wire is the metal inlet.
  • the temperature of the EGR gas flowing inside the flange 87a (second EGR gas temperature) TG2 is shown, and another broken line shows the cooling water temperature THW.
  • the various temperatures TW1, TW2, TI1, TI2, TG1, TG2, THW are set during engine operation in which the engine speed (EGR flow rate) becomes high.
  • the various temperatures TW1, TW2, TI1, TI2, TG1, TG2, THW decrease.
  • the resin inlet flange 86a has low thermal conductivity and cooling by the outside air is suppressed, so that the heat escape from the hot water passage 61 to the outside air becomes relatively small. Therefore, the drop in the first inner wall temperature TI1 is relatively small.
  • the metal inlet flange 87a has high thermal conductivity and is easily cooled by the outside air, so that the heat escapes from the hot water passage 61 to the outside air becomes relatively large. Therefore, the drop in the second inner wall temperature TI2 becomes relatively large.
  • the inlet flange 86a made of resin, the temperature rise of the inner wall thereof can be improved when the engine is running (when EGR is executed), and when the engine is stopped (when EGR is stopped), the temperature rise can be improved. It is possible to suppress the temperature drop of the inner wall. Further, by heating the EGR gas by the hot water passage 61 of the resin inlet flange 86a, the temperature drop of the inner wall of the downstream pipe 86 and the EGR gas flowing therethrough can be suppressed. In addition, the heating of the downstream side pipe 86 is not transmitted to the upstream side pipe 85.
  • the heat insulating means is provided in almost all of the middle flow passage portion MSP, but it is also possible to provide the heat insulating means only in the most downstream portion of the middle flow passage portion.
  • downstream passage portion DSP of the EGR passage 12 is configured by the EGR gas distributor 15, but the downstream passage portion can also be configured by the piping of the EGR passage instead of the EGR gas distributor.
  • the heat generating film 51 is provided on the inner wall of the pipe 16, but the heat generating film can also be provided on the outer wall of the pipe. Further, although the heating unit 50 is composed of the heating film 51, the heating unit can also be composed of a heating wire.
  • the casing 21 of the EGR cooler 13 is provided with the bypass passage 21g and the bypass valve 24.
  • the casing 21 of the EGR cooler 13 is provided. Therefore, the bypass passage 21g and the bypass valve 24 can be omitted.
  • the flow path portion 21f of the casing 21 can be made shorter than that shown in FIG. In this case, although the bypass passage 21g and the bypass valve 24 do not have the detour function of the EGR gas, other than that, the same operation and effect as those of the third embodiment can be obtained.
  • the middle flow passage portion MSP is located downstream from the outlet 23d of the heat exchanger 23 and the EGR valve 14 and the pipe 16 are provided in the middle flow passage portion MSP, the EGR gas flowing through the EGR valve 14 and the pipe 16 is kept warm. It flows to the EGR gas distributor 15 (downstream passage portion DSP) while being kept warm by the means. Therefore, the temperature of the EGR gas can be lowered by the heat exchanger 15, and the flow path 34 and the pipe 16 (middle flow passage portion MSP) of the EGR valve 14 formed of the resin material are not melted by the EGR gas. It can be suppressed.
  • FIG. 40 shows the configuration from the EGR cooler 13 to the EGR gas distributor 15 by a configuration diagram according to FIG.
  • the assembly portion 21h provided in the casing 21 in which the bypass passage 21g and the bypass valve 24 are omitted is provided in the axial direction of the heat exchanger 23.
  • the EGR valve 14 was attached to the EGR cooler 13 by arranging along the line and incorporating (drop-in) the casing 46 of the EGR valve 14 into the hole of the assembly portion 21h.
  • the assembly portion 21h provided in the casing 21 excluding the bypass passage 21g and the bypass valve 24 is arranged along the direction orthogonal to the axis of the heat exchanger 23, and the assembly thereof.
  • the EGR valve 14 can also be attached to the EGR cooler 13 by incorporating (drop-in) the casing 46 of the EGR valve 14 into the hole of the attachment portion 21h. In this case, the total height of the EGR cooler 13 to which the EGR valve 14 is attached can be shortened, and the whole can be made compact.
  • FIG. 41 shows the configuration from the EGR cooler 13 to the EGR gas distributor 15 by a block diagram.
  • the upper side of the metal pipe 66 is exposed and arranged inside the pipe 16, that is, in the flow path through which the EGR gas flows.
  • the heat sink 68 is arranged on the upper side of the metal pipe 66 exposed inside the pipe 16, and the heat sink 68 is placed in the flow path. It may be exposed.
  • a gap 78 air layer (heat insulating layer) may be provided between the lower receiving portion 74 of the pipe holder 73 and the metal pipe 66.
  • the heat transfer plate 79 is formed of metal, but since the heat transfer sheet 77 is formed of a sheet material such as flexible rubber, the heat transfer sheet 77 is sandwiched between the heat transfer plate 79 and the lower pipe portion 63. It can be brought into close contact with the metal pipe 66, and the heat transfer property from the metal pipe 66 to the lower pipe portion 63 can be improved. Further, since the gap 78 is provided between the lower receiving portion 74 and the metal pipe 66, the escape of heat from the metal pipe 66 to the atmosphere side is suppressed by the gap 78. Therefore, it is possible to suppress a decrease in temperature of the inner wall of the pipe 16.
  • the outer housing 38 constituting the valve portion 32 is made of metal and the inner housing 39 is made of resin, but both the outer housing and the inner housing may be made of resin.
  • the heat insulating coating 51, the air layer 56, the hot water passage 61 and the like are provided instead of omitting the heat insulating coat 41, but together with the heat insulating coat. It is also possible to provide a heating film, an air layer, a hot water passage, and the like.
  • the pipe 16 is composed of an upper pipe portion 62 and a lower pipe portion 63, and the lower pipe portion 16 is formed.
  • a heating portion was provided only in the pipe portion 63.
  • This disclosed technology can be applied to EGR devices installed in gasoline engines and diesel engines.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

This EGR device has an EGR passage provided with: an EGR cooler (13) for cooling an EGR gas; a bypass passage (21g) for bypassing the EGR cooler (13); a bypass valve (24) for opening/closing the bypass passage (21g); an EGR valve (14) for adjusting the flow rate of the EGR gas; a pipe (16); and an EGR gas distributor (15). The EGR cooler (13) and the bypass passage (21g) constitute an upstream passage portion of the EGR passage, the EGR valve (14) and the pipe (16) constitute a midstream passage portion thereof, and the EGR gas distributor (15) constitutes a downstream passage portion thereof. The inner wall of a flow path (34) of the EGR valve (14) and the inner wall of the pipe (16) are provided with a thermal barrier coating (41) serving as a heat insulating means for maintaining the temperature of the EGR gas flowing therein.

Description

ＥＧＲ装置EGR device
　この明細書に開示される技術は、エンジンから排気通路へ排出される排気の一部をＥＧＲガスとしてＥＧＲ通路を介して吸気通路へ流し、エンジンへ還流させるように構成したＥＧＲ装置に関する。 The technique disclosed in this specification relates to an EGR device configured to flow a part of the exhaust gas discharged from the engine to the exhaust passage as EGR gas to the intake passage through the EGR passage and return it to the engine.
　従来、この種の技術として、例えば、下記の特許文献１に記載されるＥＧＲ装置が知られている。このＥＧＲ装置は、ＥＧＲ通路にＥＧＲクーラとＥＧＲ弁が設けられており、電子制御装置（ＥＣＵ）が、エンジン回転数とエンジン負荷とに基づきＥＧＲ弁を要求開度に制御するようになっている。また、このＥＧＲ装置は、エンジンが暖まる前にＥＧＲクーラで冷却されたＥＧＲガスがエンジンの燃焼室へ還流されることによる不具合を防止するために、ＥＣＵは、吸気温度及びＥＧＲガス温度のうち少なくとも一方が設定値よりも低い場合に、ＥＧＲ弁を要求開度より小さい開度に制御するようになっている。この制御により、所定温度にまで昇温していないＥＧＲガスが、燃焼室へ大量に流入することを防止するようにしている。また、エンジンが暖まる前でも、ＥＧＲ通路にある程度のＥＧＲガスを流すことで、ＥＧＲ通路を暖めるようにしている。 Conventionally, as this kind of technique, for example, the EGR apparatus described in Patent Document 1 below is known. In this EGR device, an EGR cooler and an EGR valve are provided in the EGR passage, and an electronic control unit (ECU) controls the EGR valve to the required opening degree based on the engine rotation speed and the engine load. .. Further, in this EGR device, in order to prevent a malfunction caused by the EGR gas cooled by the EGR cooler being returned to the combustion chamber of the engine before the engine warms up, the ECU determines at least one of the intake air temperature and the EGR gas temperature. When one of them is lower than the set value, the EGR valve is controlled to have an opening degree smaller than the required opening degree. This control prevents a large amount of EGR gas, which has not been heated to a predetermined temperature, from flowing into the combustion chamber. Further, even before the engine is warmed up, the EGR passage is warmed by flowing a certain amount of EGR gas through the EGR passage.
特開２０１４－１２５９７４号公報Japanese Unexamined Patent Publication No. 2014-125974
　ところが、特許文献１に記載のＥＧＲ装置では、エンジンが暖まる前でもＥＧＲ通路にＥＧＲガスを流すことでＥＧＲ通路を暖めているものの、ＥＧＲ通路がＥＧＲガスから熱を受けることでＥＧＲガス温度が下がるため、ＥＧＲ通路の下流側（下流通路部）ほどＥＧＲガスによる暖機効果が低下し、十分に暖めることができない。そのため、ＥＧＲ通路の下流通路部（例えば、終段のＥＧＲガス分配器）で凝縮水が発生するおそれがあった。 However, in the EGR apparatus described in Patent Document 1, although the EGR passage is warmed by flowing the EGR gas through the EGR passage even before the engine is warmed up, the EGR gas temperature is lowered by receiving heat from the EGR gas in the EGR passage. Therefore, the warm-up effect of the EGR gas is reduced toward the downstream side (downstream passage portion) of the EGR passage, and it is not possible to sufficiently warm the EGR passage. Therefore, there is a possibility that condensed water is generated in the downstream passage portion of the EGR passage (for example, the EGR gas distributor at the final stage).
　この開示技術は、上記事情に鑑みてなされたものであって、その目的は、ＥＧＲ通路の下流通路部へ流れるＥＧＲガスの温度低下を抑制し、その下流通路部における凝縮水の発生を抑制することを可能としたＥＧＲ装置を提供することにある。 This disclosed technique has been made in view of the above circumstances, and its purpose is to suppress a decrease in temperature of EGR gas flowing to a downstream passage portion of the EGR passage and to suppress generation of condensed water in the downstream passage portion. The purpose is to provide an EGR device that makes it possible.
　（１）上記目的を達成するために、本発明の態様は、エンジンから排気通路へ排出される排気の一部をＥＧＲガスとしてＥＧＲ通路を介して吸気通路へ流してエンジンへ還流させるように構成したＥＧＲ装置において、ＥＧＲ通路には、ＥＧＲガスの流量を調節するためのＥＧＲ弁が設けられ、ＥＧＲ通路は、排気通路に近い上流側通路部と、吸気通路に近い下流通路部と、上流通路部と下流通路部との間の中流通路部とを含み、中流通路部の少なくとも最下流部には、そこを流れるＥＧＲガスを保温するための保温手段が設けられることを趣旨とする。 (1) In order to achieve the above object, an embodiment of the present invention is configured such that a part of the exhaust gas discharged from the engine to the exhaust passage is made into EGR gas and flows to the intake passage through the EGR passage and is returned to the engine. In the EGR device, the EGR passage is provided with an EGR valve for adjusting the flow rate of the EGR gas, and the EGR passage includes an upstream passage portion near the exhaust passage, a downstream passage portion near the intake passage, and an upper flow. It is intended that at least the most downstream portion of the middle flow passage portion, including the middle flow passage portion between the road portion and the downstream passage portion, is provided with a heat insulating means for keeping the EGR gas flowing there. ..
　上記（１）の構成によれば、ＥＧＲ通路の中流通路部の少なくとも最下流部に、そこを流れるＥＧＲガスを保温するための保温手段が設けられる。従って、ＥＧＲ通路の上流通路部から中流通路部へ流れたＥＧＲガスの熱は、保温手段により外部へ伝わり難くなり、ＥＧＲガスが保温された状態で下流通路部へ流れる。 According to the configuration of (1) above, a heat insulating means for keeping the EGR gas flowing there is provided at least in the most downstream part of the middle flow passage portion of the EGR passage. Therefore, the heat of the EGR gas flowing from the upstream passage portion to the middle flow passage portion of the EGR passage is difficult to be transmitted to the outside by the heat insulating means, and flows to the downstream passage portion in a state where the EGR gas is kept warm.
　（２）上記目的を達成するために、上記（１）の構成において、保温手段は、中流通路部を、ＥＧＲガスを保温する機能を有する樹脂材により形成することで構成されることが好ましい。 (2) In order to achieve the above object, in the above configuration (1), it is preferable that the heat insulating means is formed by forming the middle flow passage portion with a resin material having a function of retaining heat of EGR gas. ..
　上記（２）の構成によれば、上記（１）の構成の作用に加え、保温手段は、中流通路部を、ＥＧＲガスを保温する機能を有する樹脂材により形成することで構成されるので、中流通路部自体に保温性が得られ、保温手段を別途設ける必要がない。 According to the configuration of (2) above, in addition to the action of the configuration of (1) above, the heat insulating means is configured by forming the middle flow passage portion with a resin material having a function of retaining heat of EGR gas. , The heat retaining property can be obtained in the middle flow passage portion itself, and it is not necessary to separately provide a heat insulating means.
　（３）上記目的を達成するために、上記（１）又は（２）の構成において、保温手段は、中流通路部の内壁に設けられる断熱コートであることが好ましい。 (3) In order to achieve the above object, in the above configuration (1) or (2), the heat insulating means is preferably a heat insulating coat provided on the inner wall of the middle flow passage portion.
　上記（３）の構成によれば、上記（１）又は（２）の構成の作用に加え、保温手段が、中流通路部の内壁に設けられる断熱コートであるので、中流通路部の内壁に対する保温手段の形成が容易となる。 According to the configuration of (3) above, in addition to the action of the configuration of (1) or (2) above, the heat insulating means is a heat insulating coat provided on the inner wall of the middle flow passage portion, so that the inner wall of the middle flow passage portion is provided. It becomes easy to form a heat insulating means for the warmth.
　（４）上記目的を達成するために、上記（３）の構成において、中流通路部は、ＥＧＲガスを保温する機能を有する樹脂材により構成される配管を含み、断熱コートは、その厚さが配管の下流側から上流側にかけて段階的又は徐々に増加するように形成されることが好ましい。 (4) In order to achieve the above object, in the configuration of (3) above, the middle flow passage portion includes a pipe made of a resin material having a function of retaining heat of EGR gas, and the heat insulating coat has a thickness thereof. Is preferably formed so as to gradually or gradually increase from the downstream side to the upstream side of the pipe.
　上記（４）の構成によれば、上記（３）の構成の作用に加え、断熱コートは、その厚さが配管の下流側から上流側にかけて段階的又は徐々に増加するように形成される。ここで、配管を流れるＥＧＲガスの温度は、配管の上流側で高く、下流側にかけて低下する。従って、配管は、その上流側から下流側にかけてそこを流れるＥＧＲガスの温度変化に合わせて断熱性が設定される。 According to the configuration of the above (4), in addition to the action of the configuration of the above (3), the heat insulating coat is formed so that its thickness gradually or gradually increases from the downstream side to the upstream side of the pipe. Here, the temperature of the EGR gas flowing through the pipe is high on the upstream side of the pipe and decreases toward the downstream side. Therefore, the heat insulating property of the pipe is set according to the temperature change of the EGR gas flowing therein from the upstream side to the downstream side.
　（５）上記目的を達成するために、上記（１）乃至（４）のいずれかの構成において、保温手段は、中流通路部の外側に設けられる空気層であることが好ましい。 (5) In order to achieve the above object, in any of the above configurations (1) to (4), the heat insulating means is preferably an air layer provided outside the middle flow passage portion.
　上記（５）の構成によれば、上記（１）乃至（４）のいずれかの構成の作用に加え、保温手段が空気層であることから、保温手段のために特別な部材を使う必要がない。 According to the configuration of (5) above, in addition to the action of any of the configurations (1) to (4) above, since the heat insulating means is an air layer, it is necessary to use a special member for the heat insulating means. not.
　（６）上記目的を達成するために、上記（１）乃至（５）のいずれかの構成において、保温手段は、中流通路部を加熱するための加熱部を含むことが好ましい。 (6) In order to achieve the above object, in any of the above configurations (1) to (5), it is preferable that the heat insulating means includes a heating portion for heating the middle flow passage portion.
　上記（６）の構成によれば、上記（１）乃至（５）のいずれかの構成の作用に加え、保温手段が、加熱部を含むことから、中流通路部を加熱部により加熱することで、その保温と昇温の両方が可能となる。 According to the configuration of the above (6), in addition to the action of the configuration of any one of the above (1) to (5), since the heat insulating means includes the heating portion, the middle flow passage portion is heated by the heating portion. Therefore, both heat retention and temperature rise are possible.
　（７）上記目的を達成するために、上記（６）の構成において、加熱部は、通電により発熱する発熱被膜であることが好ましい。 (7) In order to achieve the above object, in the configuration of the above (6), it is preferable that the heating portion is a heat-generating film that generates heat by energization.
　上記（７）の構成によれば、上記（６）の構成の作用に加え、発熱被膜を通電により発熱させることで、中流通路部が任意のタイミングで、面的に広く加熱される。 According to the configuration of the above (7), in addition to the action of the configuration of the above (6), the heat generating film is heated by energization, so that the middle flow passage portion is widely heated in terms of surface at an arbitrary timing.
　（８）上記目的を達成するために、上記（６）の構成において、加熱部は、中流通路部の少なくとも一部に形成され、温水が流れる温水通路により構成されることが好ましい。 (8) In order to achieve the above object, in the configuration of (6) above, it is preferable that the heating portion is formed in at least a part of the middle flow passage portion and is composed of a hot water passage through which hot water flows.
　上記（８）技術の構成によれば、上記（６）の構成の作用に加え、加熱部が、温水が流れる温水通路により構成されるので、エンジンを冷却することで温められたエンジン冷却水を温水として利用し、温水通路へ流すことが可能となる。 According to the configuration of the above technique (8), in addition to the action of the configuration of the above (6), since the heating unit is composed of the hot water passage through which the hot water flows, the engine cooling water warmed by cooling the engine can be used. It can be used as hot water and flowed into a hot water passage.
　（９）上記目的を達成するために、上記（８）の構成において、温水通路が設けられる中流通路部は、温水通路を挟んだ外側の外管と内側の内管とを含み、外管の厚みが内管の厚みよりも大きいことが好ましい。 (9) In order to achieve the above object, in the configuration of the above (8), the middle flow passage portion provided with the hot water passage includes an outer outer pipe and an inner inner pipe sandwiching the hot water passage, and is an outer pipe. It is preferable that the thickness of the inner tube is larger than the thickness of the inner tube.
　上記（９）の構成によれば、上記（８）の構成の作用に加え、中流通路部は、温水通路を挟んだ外管の厚みが内管の厚みよりも大きいので、温水の熱が内管の内壁には伝わり易く、外管の外壁へは逃げ難い。 According to the configuration of the above (9), in addition to the action of the configuration of the above (8), in the middle flow passage portion, the thickness of the outer pipe sandwiching the hot water passage is larger than the thickness of the inner pipe, so that the heat of the hot water is generated. It is easily transmitted to the inner wall of the inner pipe and difficult to escape to the outer wall of the outer pipe.
　（１０）上記目的を達成するために、上記（８）又は（９）の構成において、温水通路は、中流通路部の流路長手方向に沿って設けられることが好ましい。 (10) In order to achieve the above object, in the configuration of the above (8) or (9), it is preferable that the hot water passage is provided along the flow path longitudinal direction of the middle flow passage portion.
　上記（１０）の構成によれば、上記（８）又は（９）の構成の作用に加え、温水通路が中流通路部の流路長手方向に沿って設けられるので、中流通路部でのＥＧＲガスの流れに沿ってＥＧＲガスが長く温められる。 According to the configuration of the above (10), in addition to the action of the configuration of the above (8) or (9), since the hot water passage is provided along the flow path longitudinal direction of the middle flow passage portion, in the middle flow passage portion. The EGR gas is warmed for a long time along the flow of the EGR gas.
　（１１）上記目的を達成するために、上記（８）又は（９）の構成において、中流通路部は、ＥＧＲ弁と、ＥＧＲ弁より下流に配置された配管とを含み、ＥＧＲ弁と配管とが、ＥＧＲ弁の出口側に設けられる弁出口フランジと、配管の入口側に設けられる管入口フランジとを介して接続され、配管と下流通路部とが、配管の出口側に設けられる管出口フランジと、下流通路部の入口側に設けられる通路部入口フランジとを介して接続され、弁出口フランジと管入口フランジとの間及び管出口フランジと通路部入口フランジとの間の少なくとも一方にスペーサが挟まって設けられ、温水通路は、スペーサの周方向に沿って設けられることが好ましい。 (11) In order to achieve the above object, in the configuration of the above (8) or (9), the middle flow passage portion includes the EGR valve and the pipe arranged downstream from the EGR valve, and the EGR valve and the pipe. Is connected via a valve outlet flange provided on the outlet side of the EGR valve and a pipe inlet flange provided on the inlet side of the pipe, and the pipe and the downstream passage portion are connected to the pipe outlet provided on the outlet side of the pipe. It is connected via a flange and a passage inlet flange provided on the inlet side of the downstream passage portion, and a spacer is provided between the valve outlet flange and the pipe inlet flange and between the pipe outlet flange and the passage portion inlet flange. It is preferable that the hot water passage is provided along the circumferential direction of the spacer.
　上記（１１）の構成によれば、上記（８）又は（９）の構成の作用に加え、弁出口フランジと管入口フランジとの間及び管出口フランジと通路部入口フランジとの間の少なくと一方に挟まって設けられるスペーサの周方向に沿って温水通路が設けられる。従って、弁出口フランジと管入口フランジを流れるＥＧＲガス及び管出口フランジと通路部入口フランジを流れるＥＧＲガスの少なくとも一方が、スペーサの周方向に沿って温水通路の温水により温められる。 According to the configuration of (11) above, in addition to the operation of the configuration of (8) or (9) above, at least between the valve outlet flange and the pipe inlet flange and between the pipe outlet flange and the passage portion inlet flange. A hot water passage is provided along the circumferential direction of the spacer provided sandwiched between them. Therefore, at least one of the EGR gas flowing through the valve outlet flange and the pipe inlet flange and the EGR gas flowing through the pipe outlet flange and the passage portion inlet flange is warmed by the hot water in the hot water passage along the circumferential direction of the spacer.
　（１２）上記目的を達成するために、上記（８）の構成において、温水通路は、中流通路部の流路長手方向に沿って設けられる金属パイプにより構成されることが好ましい。 (12) In order to achieve the above object, it is preferable that the hot water passage is composed of a metal pipe provided along the longitudinal direction of the flow path of the middle flow passage portion in the configuration of the above (8).
　上記（１２）の構成によれば、上記（８）の構成の作用に加え、温水通路が中流通路部の流路長手方向に沿って設けられる金属パイプにより構成されるので、温水通路が、外乱による亀裂に対し樹脂材より有利となる。 According to the configuration of the above (12), in addition to the action of the configuration of the above (8), since the hot water passage is composed of the metal pipe provided along the longitudinal direction of the flow path of the middle flow passage portion, the hot water passage is formed. It is more advantageous than the resin material against cracks caused by disturbance.
　（１３）上記目的を達成するために、上記（１２）の構成において、金属パイプは、中流通路部に対しインサート成形により固定されることが好ましい。 (13) In order to achieve the above object, in the above configuration (12), it is preferable that the metal pipe is fixed to the middle flow passage portion by insert molding.
　上記（１３）の構成によれば、上記（１２）の構成の作用に加え、金属パイプが中流通路部に対しインサート成形により固定されるので、金属パイプの中流通路部に対する密着性が良くなり、金属パイプとの中流通路部との接触面積が大きくなる。また、インサート成形の仕様によっては、金属パイプを中流通路部の内壁から露出させないようにすることも可能である。 According to the configuration of the above (13), in addition to the action of the configuration of the above (12), since the metal pipe is fixed to the middle flow passage portion by insert molding, the adhesion to the middle flow passage portion of the metal pipe is good. Therefore, the contact area between the metal pipe and the middle flow passage portion becomes large. Further, depending on the specifications of insert molding, it is possible to prevent the metal pipe from being exposed from the inner wall of the midstream passage portion.
　（１４）上記目的を達成するために、上記（１２）の構成において、中流通路部には、その流路長手方向に沿って金属パイプを保持するための保持手段が設けられ、金属パイプは、中流通路部に対し保持手段により保持されることにより固定されることが好ましい。 (14) In order to achieve the above object, in the configuration of the above (12), the middle flow passage portion is provided with a holding means for holding the metal pipe along the longitudinal direction of the flow path, and the metal pipe is provided with a holding means. , It is preferable that the metal is fixed to the middle flow passage portion by being held by the holding means.
　上記（１４）の構成によれば、上記（１２）の構成の作用に加え、金属パイプが、中流通路部の流路長手方向に沿って保持手段により保持されることで固定されるので、樹脂製の中流通路部と金属パイプとの間の熱膨張差による樹脂亀裂と製造コストの点で、中流通路部に金属パイプをインサート成形により固定するよりも優位となる。 According to the configuration of the above (14), in addition to the action of the configuration of the above (12), the metal pipe is fixed by being held by the holding means along the longitudinal direction of the flow path of the middle flow passage portion. In terms of resin cracks due to the difference in thermal expansion between the resin middle flow passage portion and the metal pipe and the manufacturing cost, it is superior to fixing the metal pipe to the middle flow passage portion by insert molding.
　（１５）上記目的を達成するために、上記（１４）の構成において、保持手段により保持される金属パイプと中流通路部との間には、伝熱部材が設けられることが好ましい。 (15) In order to achieve the above object, it is preferable to provide a heat transfer member between the metal pipe held by the holding means and the middle flow passage portion in the configuration of the above (14).
　上記（１５）の構成によれば、上記（１４）の構成の作用に加え、保持手段により保持される金属パイプと中流通路部との間には、伝熱部材が設けられるので、金属パイプと中流通路部との間に隙間がなくなり、両者の間の密着性が向上する。 According to the configuration of the above (15), in addition to the action of the configuration of the above (14), a heat transfer member is provided between the metal pipe held by the holding means and the middle flow passage portion, so that the metal pipe is provided. There is no gap between the pipe and the midstream passage, and the adhesion between the two is improved.
　（１６）上記目的を達成するために、上記（１５）の構成において、　伝熱部材は、金属パイプ及び中流通路部と密着する柔軟な伝熱シートであることを趣旨とする。 (16) In order to achieve the above object, in the configuration of the above (15), the heat transfer member is a flexible heat transfer sheet that is in close contact with the metal pipe and the middle flow passage portion.
　上記（１６）の構成によれば、上記（１５）の構成の作用に加え、伝熱シートの柔軟性により金属パイプと中流通路部との間に熱膨張差が生じても、金属パイプ及び中流通路部と伝熱シートとの密着性は確保される。 According to the configuration of the above (16), in addition to the action of the configuration of the above (15), even if a thermal expansion difference occurs between the metal pipe and the middle flow passage portion due to the flexibility of the heat transfer sheet, the metal pipe and Adhesion between the midstream passage and the heat transfer sheet is ensured.
　（１７）上記目的を達成するために、上記（１４）乃至（１６）のいずれかの構成において、金属パイプと保持手段との間に、断熱用の空気層が設けられることを趣旨とする。 (17) In order to achieve the above object, in any of the above configurations (14) to (16), it is intended that an air layer for heat insulation is provided between the metal pipe and the holding means.
　上記（１７）の構成によれば、上記（１４）乃至（１６）のいずれかの構成の作用に加え、金属パイプと保持手段との間に、断熱用の空気層が設けられるので、金属パイプから大気側への熱の逃げが空気層により抑制される。 According to the configuration of (17) above, in addition to the action of any of the configurations (14) to (16) above, an air layer for heat insulation is provided between the metal pipe and the holding means, so that the metal pipe is provided. The escape of heat from the air to the atmosphere is suppressed by the air layer.
　（１８）上記目的を達成するために、上記（２）乃至（１７）のいずれかの構成において、ＥＧＲ通路には、ＥＧＲガスを冷却するためのＥＧＲクーラと、ＥＧＲクーラをバイパスするためのバイパス通路と、バイパス通路を開閉するためのバイパス弁とが更に設けられ、ＥＧＲクーラは、冷却用の熱交換器を含み、熱交換器は、ＥＧＲガスの入口と出口を含み、バイパス通路は、ＥＧＲガスの入口と出口を含み、中流通路部は、熱交換器の出口及びバイパス通路の出口より下流に位置し、ＥＧＲ弁は、中流通路部に設けられることが好ましい。 (18) In order to achieve the above object, in any of the above configurations (2) to (17), the EGR passage has an EGR cooler for cooling the EGR gas and a bypass for bypassing the EGR cooler. A passage and a bypass valve for opening and closing the bypass passage are further provided, the EGR cooler includes a heat exchanger for cooling, the heat exchanger includes an inlet and an outlet for EGR gas, and the bypass passage includes an EGR. It is preferred that the midstream passage is located downstream of the heat exchanger outlet and the bypass passage outlet, including the gas inlet and outlet, and the EGR valve is provided in the midstream passage.
　上記（１８）の構成によれば、上記（２）乃至（１７）のいずれかの構成の作用に加え、中流通路部が熱交換器の出口及びバイパス通路の出口より下流に位置し、中流通路部にＥＧＲ弁が設けられるので、ＥＧＲ弁及び中流通路部を流れるＥＧＲガスが保温手段により保温された状態で下流通路部へ流れる。 According to the configuration of (18) above, in addition to the action of any of the configurations (2) to (17) above, the middle flow passage portion is located downstream from the outlet of the heat exchanger and the outlet of the bypass passage, and is in the middle. Since the EGR valve is provided in the flow passage portion, the EGR gas flowing through the EGR valve and the middle flow passage portion flows to the downstream passage portion in a state of being kept warm by the heat insulating means.
　（１９）上記目的を達成するために、上記（１７）又は（１８）の構成において、バイパス通路の少なくとも一部を冷却するための冷却部が更に設けられることが好ましい。 (19) In order to achieve the above object, it is preferable that a cooling unit for cooling at least a part of the bypass passage is further provided in the configuration of the above (17) or (18).
　上記（１９）の構成によれば、上記（１７）又は（１８）の構成の作用に加え、バイパス通路を流れるＥＧＲガスが冷却部により冷却されるので、バイパス通路から中流通路部へ流入するＥＧＲガスの温度が低下する。 According to the configuration of the above (19), in addition to the action of the configuration of the above (17) or (18), the EGR gas flowing through the bypass passage is cooled by the cooling portion, so that the EGR gas flows from the bypass passage to the middle flow passage portion. The temperature of the EGR gas drops.
　（２０）上記目的を達成するために、上記（２）乃至（１７）のいずれかの構成において、ＥＧＲ通路には、ＥＧＲガスを冷却するためのＥＧＲクーラが更に設けられ、ＥＧＲクーラは、冷却用の熱交換器を含み、熱交換器は、ＥＧＲガスの入口と出口を含み、中流通路部は、熱交換器の出口より下流に位置し、ＥＧＲ弁は、中流通路部に設けられることが好ましい。 (20) In order to achieve the above object, in any of the above configurations (2) to (17), the EGR passage is further provided with an EGR cooler for cooling the EGR gas, and the EGR cooler is cooled. The heat exchanger includes an inlet and an outlet for EGR gas, the middle flow passage portion is located downstream from the outlet of the heat exchanger, and the EGR valve is provided in the middle flow passage portion. Is preferable.
　上記（２０）の構成によれば、上記（２）乃至（１７）のいずれかの構成の作用に加え、中流通路部が熱交換器の出口より下流に位置し、中流通路部にＥＧＲ弁が設けられるので、ＥＧＲ弁及び中流通路部を流れるＥＧＲガスが保温手段により保温された状態で下流通路部へ流れる。 According to the configuration of (20) above, in addition to the action of any of the configurations (2) to (17) above, the middle flow passage portion is located downstream from the outlet of the heat exchanger, and the EGR is located in the middle flow passage portion. Since the valve is provided, the EGR gas flowing through the EGR valve and the middle flow passage portion flows to the downstream passage portion in a state of being kept warm by the heat insulating means.
　（２１）上記目的を達成するために、上記（１）乃至（２０）のいずれかの構成において、ＥＧＲ弁は、ＥＧＲガスが流れる流路を含み、流路の内壁がＥＧＲガスを保温する機能を有する樹脂材により構成されることが好ましい。 (21) In order to achieve the above object, in any of the above configurations (1) to (20), the EGR valve includes a flow path through which the EGR gas flows, and the inner wall of the flow path has a function of retaining heat of the EGR gas. It is preferable that it is composed of a resin material having.
　上記（２１）の構成によれば、上記（１）乃至（２０）のいずれかの構成の作用に加え、ＥＧＲ弁の流路がＥＧＲガスを保温する機能を有する樹脂材により構成されるので、その流路自体に保温性が得られ、また、その流路の成形が容易となる。 According to the configuration of (21) above, in addition to the action of any of the configurations (1) to (20) above, the flow path of the EGR valve is composed of a resin material having a function of retaining heat of the EGR gas. Heat retention is obtained in the flow path itself, and molding of the flow path becomes easy.
　（２２）上記目的を達成するために、上記（１６）乃至（２１）のいずれかの構成において、ＥＧＲ弁の流路は、入口と出口を含み、流路の入口が熱交換器の出口に略隣接して配置されることが好ましい。 (22) In order to achieve the above object, in any of the configurations (16) to (21) above, the flow path of the EGR valve includes an inlet and an outlet, and the inlet of the flow path becomes the outlet of the heat exchanger. It is preferable that they are arranged substantially adjacent to each other.
　上記（２２）の構成によれば、上記（１６）乃至（２１）のいずれかの構成の作用に加え、ＥＧＲ弁の流路の入口が熱交換器の出口に略隣接して配置されるので、熱交換器の出口から流れ出たばかりのＥＧＲガスがＥＧＲ弁の樹脂製の流路の入口に早期に流れ入る。 According to the configuration of (22) above, in addition to the operation of any of the configurations (16) to (21) above, the inlet of the flow path of the EGR valve is arranged substantially adjacent to the outlet of the heat exchanger. The EGR gas that has just flowed out from the outlet of the heat exchanger flows into the inlet of the resin flow path of the EGR valve at an early stage.
　上記（１）の構成によれば、中流通路部へのＥＧＲガスの熱の伝わりを低減することができ、下流通路部へ流れるＥＧＲガスの温度低下を抑制することができ、その下流通路部における凝縮水の発生を抑制することができる。 According to the configuration of (1) above, the heat transfer of the EGR gas to the middle flow passage portion can be reduced, the temperature drop of the EGR gas flowing to the downstream passage portion can be suppressed, and the downstream passage portion thereof can be suppressed. It is possible to suppress the generation of condensed water in.
　上記（２）の構成によれば、上記（１）の構成の効果に加え、保温手段を備えたＥＧＲ装置の製造を容易化することができる。 According to the configuration of (2) above, in addition to the effect of the configuration of (1) above, it is possible to facilitate the manufacture of an EGR device provided with heat insulating means.
　上記（３）の構成によれば、上記（１）又は（２）の構成の効果に加え、保温手段を備えたＥＧＲ装置の製造を容易化することができる。 According to the configuration of (3) above, in addition to the effect of the configuration of (1) or (2) above, it is possible to facilitate the manufacture of an EGR device provided with heat insulating means.
　上記（４）の構成によれば、上記（３）の構成の効果に加え、配管を流れるＥＧＲガスの温度変化に合わせて、配管の上流側から下流側にかけてＥＧＲガスを有効に保温できると共に、配管の耐熱性を有効に確保できる。 According to the configuration of (4) above, in addition to the effect of the configuration of (3) above, the EGR gas can be effectively kept warm from the upstream side to the downstream side of the pipe according to the temperature change of the EGR gas flowing through the pipe. The heat resistance of the piping can be effectively secured.
　上記（５）の構成によれば、上記（１）乃至（３）のいずれかの構成の効果に加え、保温手段の分だけＥＧＲ装置を構成する部品点数を減らすことができる。 According to the configuration of (5) above, in addition to the effect of any of the configurations (1) to (3) above, the number of parts constituting the EGR device can be reduced by the amount of the heat insulating means.
　上記（６）の構成によれば、上記（１）又は（２）の構成の効果に加え、中流通路部を流れるＥＧＲガスを有効に保温することができる。 According to the configuration of (6) above, in addition to the effect of the configuration of (1) or (2) above, the EGR gas flowing through the middle flow passage portion can be effectively kept warm.
　上記（７）の構成によれば、上記（６）の構成の効果に加え、中流通路部を流れるＥＧＲガスを応答性良く、安定的に保温することができる。 According to the configuration of (7) above, in addition to the effect of the configuration of (6) above, the EGR gas flowing through the middle flow passage portion can be responsively and stably kept warm.
　上記（８）の構成によれば、上記（６）の構成の効果に加え、電気的構成を用いることなく加熱することができる。また、中流通路部のＥＧＲガスの流れが停止しても、温水通路の温水により中流通路部の加熱が継続されるので、中流通路部をＥＧＲガスが再び流れたときに、中流通路部での凝縮水の発生を抑制することができる。 According to the configuration of (8) above, in addition to the effect of the configuration of (6) above, heating can be performed without using the electrical configuration. Further, even if the flow of EGR gas in the middle flow passage is stopped, the heating of the middle flow passage is continued by the hot water in the hot water passage, so that when the EGR gas flows again in the middle flow passage, the middle flow is performed. The generation of condensed water in the road can be suppressed.
　上記（９）の構成によれば、上記（８）の構成の効果に加え、内管の内部を流れるＥＧＲガスの加熱性及び保温性を高めることができる。 According to the configuration of (9) above, in addition to the effect of the configuration of (8) above, the heatability and heat retention of the EGR gas flowing inside the inner pipe can be enhanced.
　上記（１０）の構成によれば、上記（８）又は（９）の構成の効果に加え、中流通路部を流れるＥＧＲガスの加熱性及び保温性を更に高めることができる。 According to the configuration of (10) above, in addition to the effect of the configuration of (8) or (9) above, the heatability and heat retention of the EGR gas flowing through the middle flow passage portion can be further enhanced.
　上記（１１）の構成によれば、上記（８）又は（９）の構成の効果に加え、スペーサに隣接する中流通路部の部位を流れるＥＧＲガスを有効に保温することができる。 According to the configuration of (11) above, in addition to the effect of the configuration of (8) or (9) above, the EGR gas flowing through the portion of the middle flow passage portion adjacent to the spacer can be effectively kept warm.
　上記（１２）の構成によれば、上記（８）の構成の効果に加え、温水通路としての耐久性を高めることができる。 According to the configuration of (12) above, in addition to the effect of the configuration of (8) above, the durability as a hot water passage can be enhanced.
　上記（１３）の構成によれば、上記（１２）の構成の効果に加え、温水通路の温水による、中流通路部を流れるＥＧＲガスの加熱性及び保温性を高めることができる。また、金属パイプが中流通路部の内壁から露出しないことで、凝縮水による金属パイプの腐食を防止することができる。 According to the configuration of the above (13), in addition to the effect of the configuration of the above (12), it is possible to enhance the heatability and heat retention of the EGR gas flowing through the middle flow passage portion by the hot water of the hot water passage. Further, since the metal pipe is not exposed from the inner wall of the middle flow passage portion, it is possible to prevent the metal pipe from being corroded by the condensed water.
　上記（１４）の構成によれば、上記（１２）の構成の効果に加え、金属パイプの延長と設計の自由度を向上させることができる。 According to the configuration of (14) above, in addition to the effect of the configuration of (12) above, it is possible to extend the metal pipe and improve the degree of freedom in design.
　上記（１５）の構成によれば、上記（１４）の構成の効果に加え、金属パイプの中の温水通路を流れる温水による中流通路部の内壁への伝熱性を向上させることができ、その内壁の昇温性を向上させることができ、中流通路部の内部を流れるＥＧＲガスの昇温性を向上させることができる。 According to the configuration of (15) above, in addition to the effect of the configuration of (14) above, the heat transfer property of the hot water flowing through the hot water passage in the metal pipe to the inner wall of the middle flow passage portion can be improved. It is possible to improve the temperature rise property of the inner wall, and it is possible to improve the temperature rise property of the EGR gas flowing inside the middle flow passage portion.
　上記（１６）の構成によれば、上記（１５）の構成の効果に加え、温水通路を流れる温水による中流通路部の内壁への伝熱性を更に向上させることができ、その内壁の昇温性を更に向上させることができ、中流通路部の内部を流れるＥＧＲガスの昇温性を更に向上させることができる。 According to the configuration of the above (16), in addition to the effect of the configuration of the above (15), the heat transfer property of the hot water flowing through the hot water passage to the inner wall of the middle flow passage portion can be further improved, and the temperature of the inner wall thereof is raised. The property can be further improved, and the temperature rise property of the EGR gas flowing inside the middle flow passage portion can be further improved.
　上記（１７）の構成によれば、上記（１４）乃至（１６）のいずれかの構成の効果に加え、中流通路部の内壁の温度低下を抑制することができる。 According to the configuration of (17) above, in addition to the effect of any of the configurations (14) to (16) above, it is possible to suppress a decrease in temperature of the inner wall of the middle flow passage portion.
　上記（１８）の構成によれば、上記（２）乃至（１７）のいずれかの構成の効果に加え、熱交換器によりＥＧＲガスの温度を低下させることができ、中流通路部のＥＧＲガスによる溶損を抑制することができる。 According to the configuration of (18) above, in addition to the effect of any of the configurations (2) to (17) above, the temperature of the EGR gas can be lowered by the heat exchanger, and the EGR gas in the middle flow passage portion can be lowered. It is possible to suppress the melting damage due to.
　上記（１９）の構成によれば、上記（１７）又は（１８）の構成の効果に加え、ＥＧＲガスの温度を中流通路部を構成する樹脂の耐熱温度に近付けることができ、バイパス通路に高温のＥＧＲガスが流れても、ＥＧＲガスによる中流通路部の溶損を抑制することができる。 According to the configuration of the above (19), in addition to the effect of the configuration of the above (17) or (18), the temperature of the EGR gas can be brought close to the heat resistant temperature of the resin constituting the middle flow passage portion, and the bypass passage can be provided. Even if the high temperature EGR gas flows, it is possible to suppress the melting damage of the middle flow passage portion due to the EGR gas.
　上記（２０）の構成によれば、上記（２）乃至（１７）のいずれかの構成の効果に加え、熱交換器によりＥＧＲガスの温度を低下させることができ、中流通路部のＥＧＲガスによる溶損を抑制することができる。 According to the configuration of (20) above, in addition to the effect of any of the configurations (2) to (17) above, the temperature of the EGR gas can be lowered by the heat exchanger, and the EGR gas in the middle flow passage portion can be lowered. It is possible to suppress the melting damage due to.
　上記（２１）の構成によれば、上記（１）乃至（２０）のいずれかの構成の効果に加え、ＥＧＲ弁におけるＥＧＲガスの温度低下の抑制を容易化することができる。 According to the configuration of the above (21), in addition to the effect of the configuration of any one of the above (1) to (20), it is possible to facilitate the suppression of the temperature decrease of the EGR gas in the EGR valve.
　上記（２２）の構成によれば、上記（１６）乃至（２１）のいずれかの構成の効果に加え、熱交換器の出口から流れ出たばかりのＥＧＲガスの温度低下をＥＧＲ弁の流路により抑制することができる。 According to the configuration of (22) above, in addition to the effect of any of the configurations (16) to (21) above, the temperature drop of the EGR gas that has just flowed out from the outlet of the heat exchanger is suppressed by the flow path of the EGR valve. can do.
第１実施形態に係り、エンジンシステムを示す概略構成図。A schematic configuration diagram showing an engine system according to the first embodiment. 第１実施形態に係り、ＥＧＲクーラからＥＧＲガス分配器までのＥＧＲ通路上の具体的な構成を一部破断して示す構成図。FIG. 6 is a configuration diagram showing a specific configuration on an EGR passage from an EGR cooler to an EGR gas distributor with a partial breakage according to the first embodiment. 第１実施形態に係り、図２のＥＧＲ弁からＥＧＲガス分配器までの構成を示す構成図。FIG. 6 is a configuration diagram showing a configuration from the EGR valve of FIG. 2 to the EGR gas distributor according to the first embodiment. 第１実施形態に係り、配管を示す図３のＡ－Ａ線断面図。FIG. 3 is a sectional view taken along line AA of FIG. 3 showing piping according to the first embodiment. 第１実施形態に係り、配管を示す図３のＢ－Ｂ線断面図。FIG. 3 is a sectional view taken along line BB of FIG. 3 showing piping according to the first embodiment. 第１実施形態に係り、エンジン始動後のＥＧＲ弁とバイパス弁の開閉及び各種温度の変化を示すタイムチャート。A time chart showing the opening and closing of the EGR valve and the bypass valve and changes in various temperatures after the engine is started according to the first embodiment. 第２実施形態に係り、配管からＥＧＲガス分配器までの構成を示す図３に準ずる構成図。FIG. 3 is a configuration diagram according to FIG. 3 showing a configuration from piping to an EGR gas distributor according to a second embodiment. 第２実施形態に係り、配管を示す図５に準ずる断面図。FIG. 5 is a cross-sectional view according to FIG. 5 showing piping according to the second embodiment. 第３実施形態に係り、ＥＧＲクーラからＥＧＲガス分配器までの構成を示す図２に準ずる構成図。FIG. 2 is a configuration diagram according to FIG. 2 showing a configuration from an EGR cooler to an EGR gas distributor according to a third embodiment. 第４実施形態に係り、ＥＧＲクーラからＥＧＲガス分配器までの構成を示す図２に準ずる構成図。FIG. 2 is a configuration diagram according to FIG. 2 showing a configuration from an EGR cooler to an EGR gas distributor according to a fourth embodiment. 第５実施形態に係り、配管をその長手方向と直交する方向に切断して示す断面図。FIG. 5 is a cross-sectional view showing a pipe cut in a direction orthogonal to the longitudinal direction thereof according to the fifth embodiment. 第６実施形態に係り、配管をその長手方向と直交する方向に切断して示す断面図。FIG. 6 is a cross-sectional view showing a pipe cut in a direction orthogonal to the longitudinal direction thereof according to the sixth embodiment. 第７実施形態に係り、ＥＧＲクーラからＥＧＲガス分配器までの構成を示す図２に準ずる構成図。FIG. 2 is a configuration diagram according to FIG. 2 showing a configuration from an EGR cooler to an EGR gas distributor according to a seventh embodiment. 第８実施形態に係り、ＥＧＲクーラからＥＧＲガス分配器までの構成を示す図２に準ずる構成図。FIG. 2 is a configuration diagram according to FIG. 2 showing a configuration from an EGR cooler to an EGR gas distributor according to an eighth embodiment. 第９実施形態に係り、ＥＧＲクーラからＥＧＲガス分配器までの構成を示す図９に準ずる構成図。FIG. 9 is a configuration diagram according to FIG. 9 showing a configuration from an EGR cooler to an EGR gas distributor according to a ninth embodiment. 第９実施形態に係り、配管を示す図１５のＣ－Ｃ線断面図。FIG. 15 is a sectional view taken along line CC of FIG. 15 showing piping according to the ninth embodiment. 第１０実施形態に係り、配管の構成を示す図１６に準ずる断面図。FIG. 16 is a cross-sectional view according to FIG. 16 showing a configuration of piping according to the tenth embodiment. 第１１実施形態に係り、ＥＧＲクーラからＥＧＲガス分配器までの構成を示す図１５に準ずる構成図。FIG. 15 is a configuration diagram according to FIG. 15 showing a configuration from an EGR cooler to an EGR gas distributor according to the eleventh embodiment. 第１１実施形態に係り、配管を示す図１８のＤ－Ｄ線断面図。FIG. 18 is a sectional view taken along line DD of FIG. 18 showing piping according to the eleventh embodiment. 第１２実施形態に係り、配管を示す図１９に準ずる断面図。FIG. 19 is a cross-sectional view according to FIG. 19 showing piping according to the twelfth embodiment. 第１３実施形態に係り、配管を示す図１９に準ずる断面図。FIG. 19 is a cross-sectional view according to FIG. 19 showing piping according to the thirteenth embodiment. 第１４実施形態に係り、配管を示す図１９に準ずる断面図。FIG. 19 is a cross-sectional view according to FIG. 19 showing piping according to the 14th embodiment. 第１５実施形態に係り、配管を示す図１９に準ずる断面図。FIG. 19 is a cross-sectional view according to FIG. 19 showing piping according to the fifteenth embodiment. 第１６実施形態に係り、金属パイプが固定された配管の一部を示す側面図。A side view showing a part of a pipe to which a metal pipe is fixed according to a sixteenth embodiment. 第１６実施形態に係り、金属パイプが固定された配管を示す図２４のＥ－Ｅ線断面図。FIG. 24 is a sectional view taken along line EE of FIG. 24 showing a pipe to which a metal pipe is fixed according to a sixteenth embodiment. 第１７実施形態に係り、金属パイプが固定された配管の一部を示す側面図。A side view showing a part of a pipe to which a metal pipe is fixed according to the seventeenth embodiment. 第１７実施形態に係り、金属パイプが固定された配管を示す図２６のＦ－Ｆ線断面図。FIG. 26 is a sectional view taken along line FF of FIG. 26 showing a pipe to which a metal pipe is fixed according to the 17th embodiment. 第１８実施形態に係り、金属パイプが固定された配管を示す図２５に準ずる断面図。FIG. 25 is a cross-sectional view according to FIG. 25 showing a pipe to which a metal pipe is fixed according to the eighteenth embodiment. 第１９実施形態に係り、金属パイプが固定された配管を示す図２７に準ずる断面図。FIG. 27 is a cross-sectional view according to FIG. 27 showing a pipe to which a metal pipe is fixed according to the nineteenth embodiment. 第２０実施形態に係り、金属パイプが固定された配管を示す図２８に準ずる断面図。FIG. 28 is a cross-sectional view according to FIG. 28 showing a pipe to which a metal pipe is fixed according to the twentieth embodiment. 第２１実施形態に係り、金属パイプが固定された配管を示す図２９に準ずる断面図。FIG. 29 is a cross-sectional view according to FIG. 29 showing a pipe to which a metal pipe is fixed according to the 21st embodiment. 第２２実施形態に係り、金属パイプが固定された配管の一部を示す側面図。A side view showing a part of a pipe to which a metal pipe is fixed according to the 22nd embodiment. 第２２実施形態に係り、金属パイプが固定された配管を示す図３２のＧ－Ｇ線断面図。FIG. 32 is a sectional view taken along line GG of FIG. 32 showing a pipe to which a metal pipe is fixed according to the 22nd embodiment. 第２３実施形態に係り、金属パイプが固定された配管の一部を示す側面図。A side view showing a part of a pipe to which a metal pipe is fixed according to the 23rd embodiment. 第２３実施形態に係り、金属パイプが固定された配管を示す図３４のＨ－Ｈ線断面図。FIG. 34 is a sectional view taken along line OH of FIG. 34 showing a pipe to which a metal pipe is fixed according to the 23rd embodiment. 第２４実施形態に係り、ＥＧＲクーラからＥＧＲガス分配器までの構成を示す図１５に準ずる構成図。FIG. 15 is a configuration diagram according to FIG. 15 showing a configuration from an EGR cooler to an EGR gas distributor according to the 24th embodiment. 第２４実施形態に係り、測定対象である、金属製の上流側配管及びその出口フランジと、樹脂製の下流側配管及びその入口フランジとの接続部分を示す断面図。FIG. 4 is a cross-sectional view showing a connection portion between a metal upstream pipe and its outlet flange and a resin downstream pipe and its inlet flange, which are the objects of measurement according to the 24th embodiment. 第２４実施形態に関連した対比例に係り、測定対象である、金属製の上流側配管及びその出口フランジと、金属製の下流側配管及びその入口フランジとの接続部分を示す断面図。FIG. 4 is a cross-sectional view showing a connection portion between a metal upstream pipe and its outlet flange and a metal downstream pipe and its inlet flange, which are related to the 24th embodiment in inverse proportion and are measurement targets. 第２４実施形態に係り、（Ａ）エンジン回転数（ＥＧＲ流量）の変化と、（Ｂ）各種温度の変化を示すタイムチャート。A time chart showing (A) changes in engine speed (EGR flow rate) and (B) changes in various temperatures according to the 24th embodiment. 別の実施形態に係り、ＥＧＲクーラからＥＧＲガス分配器までの構成を示す図９に準ずる構成図。FIG. 9 is a configuration diagram according to FIG. 9 showing a configuration from an EGR cooler to an EGR gas distributor according to another embodiment. 別の実施形態に係り、ＥＧＲクーラからＥＧＲガス分配器までの構成を示す構成図。FIG. 6 is a configuration diagram showing a configuration from an EGR cooler to an EGR gas distributor according to another embodiment. 別の実施形態に係り、配管１６を示す図２３に準ずる断面図。A cross-sectional view according to FIG. 23 showing the pipe 16 according to another embodiment. 別の実施形態に係り、配管１６を示す図３５に準ずる断面図。FIG. 6 is a cross-sectional view according to FIG. 35 showing the pipe 16 according to another embodiment.
　以下、ＥＧＲ装置をガソリンエンジンシステムに具体化したいくつかの実施形態について説明する。 Hereinafter, some embodiments in which the EGR device is embodied in a gasoline engine system will be described.
＜第１実施形態＞
　先ず、第１実施形態について図面を参照して詳細に説明する。 <First Embodiment>
First, the first embodiment will be described in detail with reference to the drawings.
[エンジンシステムについて]
　図１に、この実施形態のガソリンエンジンシステム（以下、単に「エンジンシステム」と言う。）を概略構成図により示す。自動車に搭載されたエンジンシステムは、複数の気筒を有するエンジン１を備える。このエンジン１は、４気筒、４サイクルのレシプロエンジンであり、ピストン及びクランクシャフト等の周知の構成を含む。エンジン１には、各気筒へ吸気を導入するための吸気通路２と、エンジン１の各気筒から排気を導出するための排気通路３が設けられる。吸気通路２には、スロットル装置４及び吸気マニホールド５が設けられる。排気通路３には、排気マニホールド６及び触媒７が設けられる。加えて、排気通路３と吸気通路２との間には、高圧ループタイプの排気還流装置（ＥＧＲ装置）１１が設けられる。 [About the engine system]
FIG. 1 shows a gasoline engine system of this embodiment (hereinafter, simply referred to as “engine system”) by a schematic configuration diagram. The engine system mounted on the automobile includes an engine 1 having a plurality of cylinders. The engine 1 is a 4-cylinder, 4-cycle reciprocating engine and includes well-known configurations such as a piston and a crankshaft. The engine 1 is provided with an intake passage 2 for introducing intake air into each cylinder and an exhaust passage 3 for deriving exhaust gas from each cylinder of the engine 1. The intake passage 2 is provided with a throttle device 4 and an intake manifold 5. The exhaust passage 3 is provided with an exhaust manifold 6 and a catalyst 7. In addition, a high-pressure loop type exhaust gas recirculation device (EGR device) 11 is provided between the exhaust passage 3 and the intake passage 2.
　スロットル装置４は、吸気マニホールド５より上流の吸気通路２に配置され、運転者のアクセル操作に応じてバタフライ式のスロットル弁４ａを開度可変に開閉駆動させることで、吸気通路２を流れる吸気量を調節するようになっている。吸気マニホールド５は、主として樹脂材により構成され、エンジン１の直上流にて吸気通路２に配置され、吸気が導入される一つのサージタンク５ａと、サージタンク５ａに導入された吸気をエンジン１の各気筒へ分配するためにサージタンク５ａから分岐した複数（４つ）の分岐管５ｂとを含む。触媒７には、排気を浄化するために、例えば、三元触媒が内蔵される。 The throttle device 4 is arranged in the intake passage 2 upstream of the intake manifold 5, and by driving the butterfly type throttle valve 4a to open and close with a variable opening according to the accelerator operation of the driver, the amount of intake air flowing through the intake passage 2 Is designed to be adjusted. The intake manifold 5 is mainly composed of a resin material and is arranged in the intake passage 2 directly upstream of the engine 1. One surge tank 5a into which the intake air is introduced and the intake air introduced in the surge tank 5a are used in the engine 1. It includes a plurality of (four) branch pipes 5b branched from the surge tank 5a for distribution to each cylinder. The catalyst 7 contains, for example, a three-way catalyst in order to purify the exhaust gas.
　エンジン１には、各気筒に対応して燃料を噴射するための燃料噴射装置（図示略）が設けられる。燃料噴射装置は、燃料供給装置（図示略）から供給される燃料をエンジン１の各気筒へ噴射するように構成される。各気筒では、燃料噴射装置から噴射される燃料と吸気マニホールド５から導入される吸気とにより可燃混合気が形成される。 The engine 1 is provided with a fuel injection device (not shown) for injecting fuel corresponding to each cylinder. The fuel injection device is configured to inject fuel supplied from a fuel supply device (not shown) into each cylinder of the engine 1. In each cylinder, a combustible air-fuel mixture is formed by the fuel injected from the fuel injection device and the intake air introduced from the intake manifold 5.
　エンジン１には、各気筒に対応して点火装置（図示略）が設けられる。点火装置は、各気筒で可燃混合気に点火するように構成される。各気筒内の可燃混合気は、点火装置の点火動作により爆発・燃焼し、燃焼後の排気は、各気筒から排気マニホールド６及び触媒７を経て外部へ排出される。このとき、各気筒でピストン（図示略）が上下運動し、クランクシャフト（図示略）が回転することにより、エンジン１に動力が得られる。 The engine 1 is provided with an ignition device (not shown) corresponding to each cylinder. The igniter is configured to ignite the combustible mixture in each cylinder. The combustible air-fuel mixture in each cylinder explodes and burns due to the ignition operation of the ignition device, and the exhaust gas after combustion is discharged from each cylinder to the outside via the exhaust manifold 6 and the catalyst 7. At this time, the piston (not shown) moves up and down in each cylinder, and the crankshaft (not shown) rotates to obtain power to the engine 1.
[ＥＧＲ装置について]
　図１に示すように、この実施形態のＥＧＲ装置１１は、エンジン１の各気筒から排気通路３へ排出される排気の一部を排気還流ガス（ＥＧＲガス）として吸気通路２へ流してエンジン１の各気筒へ還流させるように構成される。ＥＧＲ装置１１は、排気還流通路（ＥＧＲ通路）１２と、ＥＧＲ通路１２を流れるＥＧＲガスを冷却するための排気還流クーラ（ＥＧＲクーラ）１３と、ＥＧＲ通路１２を流れるＥＧＲガスの流量を調節するための排気還流弁（ＥＧＲ弁）１４と、ＥＧＲ通路１２を流れるＥＧＲガスをエンジン１の各気筒へ分配するために、吸気マニホールド５の各分岐管５ｂへＥＧＲガスを分配するための排気還流ガス分配器（ＥＧＲガス分配器）１５とを備える。これらＥＧＲクーラ１３、ＥＧＲ弁１４及びＥＧＲガス分配器１５のＥＧＲガスが流れる流路もＥＧＲ通路１２を構成している。ＥＧＲ通路１２を構成する配管は、入口１２ａと出口１２ｂを含む。その入口１２ａは、触媒７より上流の排気通路３に接続され、その出口１２ｂは、ＥＧＲガス分配器１５に接続される。この実施形態で、ＥＧＲガス分配器１５は、ＥＧＲ通路１２の終段を構成している。ＥＧＲ通路１２において、ＥＧＲ弁１４は、ＥＧＲクーラ１３より下流に設けられ、ＥＧＲガス分配器１５は、ＥＧＲ弁１４より下流に設けられる。 [About EGR equipment]
As shown in FIG. 1, in the EGR device 11 of this embodiment, a part of the exhaust gas discharged from each cylinder of the engine 1 to the exhaust passage 3 is flowed to the intake passage 2 as an exhaust gas recirculation gas (EGR gas) to the engine 1. It is configured to recirculate to each cylinder of. The EGR device 11 adjusts the flow rate of the exhaust gas recirculation passage (EGR passage) 12, the exhaust gas recirculation cooler (EGR cooler) 13 for cooling the EGR gas flowing through the EGR passage 12, and the EGR gas flowing through the EGR passage 12. Exhaust gas recirculation valve (EGR valve) 14 and exhaust gas recirculation gas distribution for distributing EGR gas to each branch pipe 5b of the intake manifold 5 in order to distribute the EGR gas flowing through the EGR passage 12 to each cylinder of the engine 1. A device (EGR gas distributor) 15 is provided. The flow path through which the EGR gas of the EGR cooler 13, the EGR valve 14, and the EGR gas distributor 15 flows also constitutes the EGR passage 12. The piping constituting the EGR passage 12 includes an inlet 12a and an outlet 12b. The inlet 12a is connected to the exhaust passage 3 upstream of the catalyst 7, and the outlet 12b is connected to the EGR gas distributor 15. In this embodiment, the EGR gas distributor 15 constitutes the final stage of the EGR passage 12. In the EGR passage 12, the EGR valve 14 is provided downstream from the EGR cooler 13, and the EGR gas distributor 15 is provided downstream from the EGR valve 14.
　ＥＧＲガス分配器１５は、主として樹脂材により構成され、全体として横長な形状を有し、その長手方向において、吸気マニホールド５の複数の分岐管５ｂを横切るように配置される。この実施形態で、ＥＧＲガス分配器１５は、導入されたＥＧＲガスが集まるガスチャンバ１５ａと、ガスチャンバ１５ａから各分岐管５ｂへＥＧＲガスを分配する複数（４つ）のガス分配通路１５ｂとを含む。 The EGR gas distributor 15 is mainly composed of a resin material, has a horizontally long shape as a whole, and is arranged so as to cross a plurality of branch pipes 5b of the intake manifold 5 in the longitudinal direction thereof. In this embodiment, the EGR gas distributor 15 has a gas chamber 15a in which the introduced EGR gas is collected, and a plurality (four) gas distribution passages 15b for distributing the EGR gas from the gas chamber 15a to each branch pipe 5b. include.
　このＥＧＲ装置１１では、ＥＧＲ弁１４が開弁することにより、排気通路３を流れる排気の一部がＥＧＲガスとしてＥＧＲ通路１２を流れ、ＥＧＲクーラ１３、ＥＧＲ弁１４及びＥＧＲガス分配器１５を介して吸気マニホールド５の各分岐管５ｂへ分配され、更にエンジン１の各気筒へ分配されて還流される。 In this EGR device 11, when the EGR valve 14 is opened, a part of the exhaust gas flowing through the exhaust passage 3 flows through the EGR passage 12 as EGR gas, and passes through the EGR cooler 13, the EGR valve 14, and the EGR gas distributor 15. It is distributed to each branch pipe 5b of the intake manifold 5, and further distributed to each cylinder of the engine 1 to be circulated.
　ＥＧＲ通路１２は、図１に矢印で示すように、排気通路３に近い上流通路部ＵＳＰと、吸気通路２を構成する吸気マニホールド５に近い下流通路部ＤＳＰと、上流通路部ＵＳＰと下流通路部ＤＳＰとの間の中流通路部ＭＳＰとを含む。この実施形態では、上流通路部ＵＳＰは、ＥＧＲ通路１２の入口１２ａからＥＧＲクーラ１３までの間の通路部を含む。中流通路部ＭＳＰは、ＥＧＲクーラ１３からＥＧＲガス分配器１５の入口までの通路部を含む（中流通路部ＭＳＰの範囲の詳細については後述する。）。下流通路部ＤＳＰは、ＥＧＲガス分配器１５の中の通路部を含む。上記したように、この実施形態で、上流通路部ＵＳＰ、中流通路部ＭＳＰ及び下流通路部ＤＳＰは、ＥＧＲ通路１２の実質的な流路長さで区分けされておらず、ＥＧＲ通路１２上に設けられるＥＧＲクーラ１３、ＥＧＲ弁１４及びＥＧＲガス分配器１５等の機器の配置に応じて区分けされている。上流通路部ＵＳＰ、中流通路部ＭＳＰ及び下流通路部ＤＳＰを、ＥＧＲ通路１２の実質的な流路長さで区分することも可能である。 As shown by an arrow in FIG. 1, the EGR passage 12 includes an upstream passage portion USP near the exhaust passage 3, a downstream passage portion DSP near the intake manifold 5 constituting the intake passage 2, and an upstream passage portion USP and downstream. Includes a midstream passage MSP between the passage DSP. In this embodiment, the upstream passage portion USP includes a passage portion between the inlet 12a of the EGR passage 12 and the EGR cooler 13. The midstream passage portion MSP includes a passage portion from the EGR cooler 13 to the inlet of the EGR gas distributor 15 (details of the range of the midstream passage portion MSP will be described later). The downstream passage DSP includes a passage in the EGR gas distributor 15. As described above, in this embodiment, the upstream passage portion USP, the middle flow passage portion MSP, and the downstream passage portion DSP are not separated by the substantial flow path length of the EGR passage 12, and are on the EGR passage 12. It is classified according to the arrangement of equipment such as the EGR cooler 13, the EGR valve 14, and the EGR gas distributor 15 provided in the EGR cooler 13. It is also possible to classify the upstream passage portion USP, the middle flow passage portion MSP and the downstream passage portion DSP by the substantial flow path length of the EGR passage 12.
　図２に、ＥＧＲクーラ１３からＥＧＲガス分配器１５までのＥＧＲ通路１２上の具体的な構成を一部破断して構成図により示す。図３に、図２のＥＧＲ弁１４からＥＧＲガス分配器１５までの構成を構成図により示す。図２、図３に示すように、この実施形態では、ＥＧＲクーラ１３の出口２１ｃにＥＧＲ弁１４の流路３４の入口３４ａが接続され、ＥＧＲ弁１４の流路３４の出口３４ｂにＥＧＲ通路１２を構成する配管１６の入口１６ａが接続され、配管１６の出口１６ｂがＥＧＲガス分配器１５の入口に接続される。 FIG. 2 is a configuration diagram showing a specific configuration on the EGR passage 12 from the EGR cooler 13 to the EGR gas distributor 15 with a partial break. FIG. 3 shows the configuration from the EGR valve 14 to the EGR gas distributor 15 in FIG. 2 by a block diagram. As shown in FIGS. 2 and 3, in this embodiment, the inlet 34a of the flow path 34 of the EGR valve 14 is connected to the outlet 21c of the EGR cooler 13, and the EGR passage 12 is connected to the outlet 34b of the flow path 34 of the EGR valve 14. The inlet 16a of the pipe 16 constituting the above is connected, and the outlet 16b of the pipe 16 is connected to the inlet of the EGR gas distributor 15.
　図２に示すように、ＥＧＲクーラ１３は、ケーシング２１を備える。ケーシング２１は、ＥＧＲガスが流れる主通路２１ａと、ＥＧＲガスを導入する入口２１ｂと、ＥＧＲガスを導出する出口２１ｃと、主通路２１ａから入口２１ｂまでの間の導入部２１ｄと、主通路２１ａから出口２１ｃまでの間の導出部２１ｅ及び屈折した流路部２１ｆと、主通路２１ａと平行に設けられ、主通路２１ａをバイパスするためのバイパス通路２１ｇとを含む。主通路２１ａには、ＥＧＲガスと冷媒との間で熱交換を行う冷却用の熱交換器２３が設けられる。この熱交換器２３により、主通路２１ａを流れるＥＧＲガスを冷却するようになっている。熱交換器２３には、冷媒としてエンジン１の冷却水が循環するようになっている。熱交換器２３は、周知の構成を有する。バイパス通路２１ｇの上流部には、同通路２１ｇを開閉するためのバタフライ弁式のバイパス弁２４が設けられる。この実施形態で、図２に示すように、ＥＧＲクーラ１３は、主通路２１ａ及びバイパス通路２１ｇをＥＧＲガス（黒塗りの矢印、ハッチングを付した矢印で示す。）が斜め上方へ向けて流れるように斜めに配置される。この斜めの配置状態において、出口２１ｃは入口２１ｂよりも鉛直方向において高い位置に配置される。また、この斜めの配置状態において、ＥＧＲクーラ１３の内部で発生した凝縮水（白抜きの矢印で示す。）は、バイパス通路２１ｇを下流部から上流部へ向けて流れるようになっている。 As shown in FIG. 2, the EGR cooler 13 includes a casing 21. The casing 21 is provided from the main passage 21a through which the EGR gas flows, the inlet 21b for introducing the EGR gas, the outlet 21c for leading out the EGR gas, the introduction portion 21d between the main passage 21a and the inlet 21b, and the main passage 21a. It includes a lead-out portion 21e to the outlet 21c, a bent flow path portion 21f, and a bypass passage 21g provided in parallel with the main passage 21a and for bypassing the main passage 21a. The main passage 21a is provided with a cooling heat exchanger 23 that exchanges heat between the EGR gas and the refrigerant. The heat exchanger 23 cools the EGR gas flowing through the main passage 21a. The cooling water of the engine 1 circulates in the heat exchanger 23 as a refrigerant. The heat exchanger 23 has a well-known configuration. A butterfly valve type bypass valve 24 for opening and closing the bypass passage 21g is provided in the upstream portion of the bypass passage 21g. In this embodiment, as shown in FIG. 2, in the EGR cooler 13, the EGR gas (black arrow, indicated by a hatched arrow) flows diagonally upward through the main passage 21a and the bypass passage 21g. Arranged diagonally. In this diagonally arranged state, the outlet 21c is arranged at a position higher in the vertical direction than the inlet 21b. Further, in this diagonally arranged state, the condensed water generated inside the EGR cooler 13 (indicated by a white arrow) flows through the bypass passage 21 g from the downstream portion to the upstream portion.
　図２に示すように、熱交換器２３は、ＥＧＲガスの入口２３ａと出口２３ｂを含み、バイパス通路２１ｇは、ＥＧＲガスの入口２１ｇａと出口２１ｇｂを含む。この実施形態で、中流通路部ＭＳＰは、熱交換器２３の出口２３ｂ及びバイパス通路２１ｇの出口２１ｇｂより下流に位置し、ＥＧＲ弁１４は、中流通路部ＭＳＰに設けられる。すなわち、この実施形態において、中流通路部ＭＳＰは、ＥＧＲクーラ１３の熱交換器２３の出口２３ｂからＥＧＲガス分配器１５の入口までの通路部により構成される。 As shown in FIG. 2, the heat exchanger 23 includes an inlet 23a and an outlet 23b of the EGR gas, and the bypass passage 21g includes an inlet 21ga and an outlet 21gb of the EGR gas. In this embodiment, the midstream passage MSP is located downstream of the outlet 23b of the heat exchanger 23 and the outlet 21gb of the bypass passage 21g, and the EGR valve 14 is provided in the midstream passage MSP. That is, in this embodiment, the midstream passage portion MSP is composed of a passage portion from the outlet 23b of the heat exchanger 23 of the EGR cooler 13 to the inlet of the EGR gas distributor 15.
　図２、図３に示すように、ＥＧＲ弁１４は、ステップモータを内蔵したモータ部３１と、弁部３２とから構成される。弁部３２は、流路３４と、流路３４に配置された弁座３５、弁体３６及び弁軸３７を含む。弁部３２は、金属製の外ハウジング３８と、樹脂製の内ハウジング３９と、流路３４に面する外ハウジング３８の部分を覆う樹脂製の流路部材４０とを含む。この流路３４の内壁は、樹脂製の内ハウジング３９と、樹脂製の流路部材４０とにより構成される。すなわち、流路３４の内壁は、ＥＧＲガスを保温する機能を有する樹脂材により構成される。 As shown in FIGS. 2 and 3, the EGR valve 14 is composed of a motor unit 31 having a built-in step motor and a valve unit 32. The valve portion 32 includes a flow path 34, a valve seat 35 arranged in the flow path 34, a valve body 36, and a valve shaft 37. The valve portion 32 includes a metal outer housing 38, a resin inner housing 39, and a resin flow path member 40 that covers a portion of the outer housing 38 facing the flow path 34. The inner wall of the flow path 34 is composed of a resin inner housing 39 and a resin flow path member 40. That is, the inner wall of the flow path 34 is made of a resin material having a function of retaining heat of the EGR gas.
　ＥＧＲ弁１４の出口３４ｂに接続された配管１６は、チャネル状に屈折して形成される。この実施形態で、配管１６はＥＧＲガスを保温する機能を有する樹脂材により構成される。樹脂材として、例えば「６６ナイロン」を使用することができる。 The pipe 16 connected to the outlet 34b of the EGR valve 14 is formed by refracting in a channel shape. In this embodiment, the pipe 16 is made of a resin material having a function of keeping the EGR gas warm. As the resin material, for example, "66 nylon" can be used.
　図４に、配管１６を図３のＡ－Ａ線断面図により示す。図５に、配管１６を図３のＢ－Ｂ線断面図により示す。この実施形態では、図２に破線で、図３～図５にハッチングで示すように、ＥＧＲ弁１４の流路３４の内壁の全面と配管１６の内壁の全面には、流路３４と配管１６を流れるＥＧＲガスを保温するために断熱コート４１が設けられる。断熱コート４１として、例えば「セラミックコート」を使用することができる。断熱コート４１は、この開示技術の保温手段の一例に相当する。中流通路部ＭＳＰを構成するＥＧＲ弁１４の流路３４の内壁と配管１６の内壁には、ＥＧＲガスを保温するための断熱コート４１が設けられる。この実施形態で、図３、図５に示すように、断熱コート４１の厚さは、配管１６の上流部ＵＳ、中流部ＭＳ及び下流部ＤＳの間で一律（同一）の厚さに形成される。なお、図３に２点鎖線Ｓ１で囲って示す配管１６のコーナ部では、ＥＧＲガスの流れが衝突することから、断熱コート４１の厚さを他の部位よりも特に厚くすることが望ましい。 FIG. 4 shows the pipe 16 with a cross-sectional view taken along the line AA of FIG. FIG. 5 shows the pipe 16 with a cross-sectional view taken along the line BB of FIG. In this embodiment, as shown by the broken line in FIG. 2 and the hatching in FIGS. 3 to 5, the flow path 34 and the pipe 16 are formed on the entire inner wall of the flow path 34 of the EGR valve 14 and the entire inner wall of the pipe 16. A heat insulating coat 41 is provided to keep the EGR gas flowing through the water warm. As the heat insulating coat 41, for example, a "ceramic coat" can be used. The heat insulating coat 41 corresponds to an example of the heat insulating means of this disclosed technique. A heat insulating coat 41 for keeping the EGR gas warm is provided on the inner wall of the flow path 34 of the EGR valve 14 and the inner wall of the pipe 16 constituting the midstream passage portion MSP. In this embodiment, as shown in FIGS. 3 and 5, the thickness of the heat insulating coat 41 is formed to be uniform (same) between the upstream portion US, the middle flow portion MS, and the downstream portion DS of the pipe 16. To. Since the flow of EGR gas collides with the corner portion of the pipe 16 surrounded by the two-dot chain line S1 in FIG. 3, it is desirable to make the thickness of the heat insulating coat 41 particularly thicker than that of other portions.
[ＥＧＲ装置の作用及び効果について]
　以上説明したこの実施形態のＥＧＲ装置１１によれば、エンジン１から排気通路３へ排出される排気ガスの一部は、ＥＧＲガスとしてＥＧＲ通路１２へ流れ、ＥＧＲクーラ１３、ＥＧＲ弁１４及びＥＧＲガス分配器１５等を流れて吸気マニホールド５の各分岐管５ｂへ好適に分配され、エンジン１の各気筒へ分配されて還流される。 [About the action and effect of the EGR device]
According to the EGR device 11 of this embodiment described above, a part of the exhaust gas discharged from the engine 1 to the exhaust passage 3 flows into the EGR passage 12 as EGR gas, and the EGR cooler 13, the EGR valve 14 and the EGR gas It flows through the distributor 15 and the like, is suitably distributed to each branch pipe 5b of the intake manifold 5, is distributed to each cylinder of the engine 1, and is circulated.
　ここで、図１に示すように、ＥＧＲ通路１２は、ＥＧＲクーラ１３を含む上流通路部ＵＳＰと、ＥＧＲ弁１４と配管１６を含む中流通路部ＭＳＰと、ＥＧＲガス分配器１５で構成される下流通路部ＤＳＰとに分けられる。そして、中流通路部ＭＳＰを構成するＥＧＲ弁１４の流路３４及び配管１６の内壁がＥＧＲガスを保温する機能を有する樹脂材により構成され、ある程度の長さを有することから、それらＥＧＲ弁１４の流路３４及び配管１６でのＥＧＲガスの温度低下や、ＥＧＲガス分配器１５へ流入するＥＧＲガスの温度が問題になる。ＥＧＲガスが露点温度より低くなると、ＥＧＲガス分配器１５で凝縮水が発生してしまうからである。 Here, as shown in FIG. 1, the EGR passage 12 is composed of an upstream passage portion USP including an EGR cooler 13, a middle flow passage portion MSP including an EGR valve 14 and a pipe 16, and an EGR gas distributor 15. It is divided into a downstream passage section DSP. Since the flow path 34 of the EGR valve 14 and the inner wall of the pipe 16 constituting the midstream passage portion MSP are made of a resin material having a function of retaining heat of the EGR gas and have a certain length, the EGR valve 14 is used. The temperature drop of the EGR gas in the flow path 34 and the pipe 16 and the temperature of the EGR gas flowing into the EGR gas distributor 15 become problems. This is because when the EGR gas becomes lower than the dew point temperature, condensed water is generated in the EGR gas distributor 15.
　そこで、この実施形態のＥＧＲ装置１１の構成によれば、ＥＧＲ通路１２に設けられるＥＧＲ弁１４の流路３４及び配管１６（中流通路部ＭＳＰ）の内壁に、そこを流れるＥＧＲガスを保温するための断熱コート４１（保温手段）が設けられる。従って、ＥＧＲ通路１２に設けられるＥＧＲクーラ１３等（上流通路部ＵＳＰ）からＥＧＲ弁１４の流路３４及び配管１６（中流通路部ＭＳＰ）へ流れたＥＧＲガスの熱は、断熱コート４１により外部へ伝わり難くなり、ＥＧＲガスが保温された状態でＥＧＲガス分配器１５（下流通路部ＤＳＰ）へ流れる。特に、中流通路部ＭＳＰがＥＧＲクーラ１３の熱交換器２３の出口２３ｂ及びバイパス通路２１ｇの出口２１ｇｂより下流に位置し、中流通路部ＭＳＰにＥＧＲ弁１４が設けられる。従って、ＥＧＲ弁１４の流路３４及び配管１６を流れるＥＧＲガスが断熱コート４１により保温された状態でＥＧＲガス分配器１５へ流れる。このため、熱交換器１５によりＥＧＲガスの温度を低下させることができ、樹脂材より形成されるＥＧＲ弁１４の流路３４及び配管１６（中流通路部ＭＳＰ）の、ＥＧＲガスによる溶損を抑制することができる。また、ＥＧＲ弁１４の流路３４及び配管１６（中流通路部ＭＳＰ）での樹脂材へのＥＧＲガスの熱の伝わりを低減することができ、ＥＧＲガス分配器１５（下流通路部ＤＳＰ）へ流れるＥＧＲガスの温度低下を抑制することができ、ＥＧＲガス分配器１５を素早く暖機して、そのＥＧＲガス分配器１５における凝縮水の発生を抑制することができる。 Therefore, according to the configuration of the EGR device 11 of this embodiment, the EGR gas flowing there is kept warm on the inner wall of the flow path 34 and the pipe 16 (middle flow passage portion MSP) of the EGR valve 14 provided in the EGR passage 12. A heat insulating coat 41 (heat insulating means) is provided for this purpose. Therefore, the heat of the EGR gas flowing from the EGR cooler 13 or the like (upstream passage portion USP) provided in the EGR passage 12 to the flow path 34 of the EGR valve 14 and the pipe 16 (middle flow passage portion MSP) is generated by the heat insulating coat 41. It becomes difficult to transmit to the outside, and the EGR gas flows to the EGR gas distributor 15 (downstream passage portion DSP) in a state where the EGR gas is kept warm. In particular, the midstream passage portion MSP is located downstream from the outlet 23b of the heat exchanger 23 of the EGR cooler 13 and the outlet 21gb of the bypass passage 21g, and the EGR valve 14 is provided in the midstream passage portion MSP. Therefore, the EGR gas flowing through the flow path 34 of the EGR valve 14 and the pipe 16 flows to the EGR gas distributor 15 in a state of being kept warm by the heat insulating coat 41. Therefore, the temperature of the EGR gas can be lowered by the heat exchanger 15, and the flow path 34 and the pipe 16 (middle flow passage portion MSP) of the EGR valve 14 formed of the resin material are not melted by the EGR gas. It can be suppressed. Further, it is possible to reduce the heat transfer of the EGR gas to the resin material in the flow path 34 and the pipe 16 (middle flow passage portion MSP) of the EGR valve 14, and to the EGR gas distributor 15 (downstream passage portion DSP). The temperature drop of the flowing EGR gas can be suppressed, the EGR gas distributor 15 can be quickly warmed up, and the generation of condensed water in the EGR gas distributor 15 can be suppressed.
　この実施形態の構成によれば、中流通路部ＭＳＰを構成するＥＧＲ弁１４の流路３４及び配管１６の内壁がＥＧＲガスを保温する機能を有する樹脂材により構成されるので、その流路３４及び配管１６自体に保温性が得られ、また、流路３４及び配管１６の成形が容易となる。このため、ＥＧＲ弁１４及び配管１６（中流通路部ＭＳＰ）におけるＥＧＲガスの温度低下の抑制を容易化することができる。 According to the configuration of this embodiment, since the flow path 34 of the EGR valve 14 constituting the middle flow passage portion MSP and the inner wall of the pipe 16 are made of a resin material having a function of retaining heat of the EGR gas, the flow path 34 thereof. In addition, heat retention is obtained in the pipe 16 itself, and the flow path 34 and the pipe 16 can be easily formed. Therefore, it is possible to easily suppress the temperature drop of the EGR gas in the EGR valve 14 and the pipe 16 (middle flow passage portion MSP).
　この実施形態の構成によれば、保温手段がＥＧＲ弁１４の流路３４及び配管１６の内壁に設けられる断熱コート４１であるので、その流路３４及び配管１６（中流通路部ＭＳＰ）の内壁に対する保温手段の形成が容易となる。このため、保温手段を備えたＥＧＲ装置１１の製造を容易化することができる。 According to the configuration of this embodiment, since the heat insulating means is the heat insulating coat 41 provided on the inner wall of the flow path 34 and the pipe 16 of the EGR valve 14, the inner wall of the flow path 34 and the pipe 16 (middle flow passage portion MSP). It becomes easy to form a heat insulating means for the warmth. Therefore, it is possible to facilitate the manufacture of the EGR device 11 provided with the heat insulating means.
　この実施形態の構成によれば、ＥＧＲ弁１４の流路３４がＥＧＲガスを保温する機能を有する樹脂材により構成されるので、その流路３４自体に保温性が得られ、また、その流路３４の成形が容易となる。このため、ＥＧＲ弁１４におけるＥＧＲガスの温度低下の抑制を容易化することができる。 According to the configuration of this embodiment, since the flow path 34 of the EGR valve 14 is made of a resin material having a function of retaining heat in the EGR gas, the flow path 34 itself can obtain heat retention and the flow path thereof. Molding of 34 becomes easy. Therefore, it is possible to easily suppress the temperature drop of the EGR gas in the EGR valve 14.
　図６に、この実施形態において、エンジン始動後のＥＧＲ弁１４とバイパス弁２４の開閉及び各種温度の変化をタイムチャートにより示す。すなわち、図６は、低温時からＥＧＲ弁１４とバイパス弁２４を開弁したときの、配管１６の入口１６ａにおけるＥＧＲガスの温度（配管入口ガス温度）ＰＩＧ、配管１６の入口１６ａの内壁温度（配管入口内壁温度）ＰＩＷ１，ＰＩＷ２、ＥＧＲガス分配器１５の出口のＥＧＲガス温度（分配器出口ガス温度）ＤＯＧ１，ＤＯＧ２、冷却水の温度（冷却水温度）ＴＨＷ、ＥＧＲガス分配器１５の出口の内壁温度（分配器出口内壁温度）ＤＯＷ１，ＤＯＷ２の変化を示す。ここで、配管入口内壁温度ＰＩＷ１は、配管１６の内壁に断熱コート４１を設けない場合を、配管入口内壁温度ＰＩＷ２は、配管１６の内壁に断熱コート４１を設けた場合をそれぞれ示す。分配器出口ガス温度ＤＯＧ１は、配管１６の内壁に断熱コート４１を設けない場合を、分配器出口ガス温度ＤＯＧ２は、配管１６の内壁に断熱コート４１を設けた場合をそれぞれ示す。分配器出口内壁温度ＤＯＷ１は、配管１６の内壁に断熱コート４１を設けない場合を、分配器出口内壁温度ＤＯＷ２は、配管１６の内壁に断熱コート４１を設けた場合をそれぞれ示す。 FIG. 6 shows in this embodiment the opening and closing of the EGR valve 14 and the bypass valve 24 and changes in various temperatures after the engine is started by a time chart. That is, FIG. 6 shows the EGR gas temperature (pipe inlet gas temperature) PIG at the inlet 16a of the pipe 16 and the inner wall temperature of the inlet 16a of the pipe 16 when the EGR valve 14 and the bypass valve 24 are opened from a low temperature. Pipe inlet inner wall temperature) PIW1, PIW2, EGR gas temperature at the outlet of the EGR gas distributor 15 (distributor outlet gas temperature) DOG1, DOG2, cooling water temperature (cooling water temperature) THW, at the outlet of the EGR gas distributor 15. The changes in the inner wall temperature (distributor outlet inner wall temperature) DOWN1 and DOWN2 are shown. Here, the pipe inlet inner wall temperature PIW1 indicates a case where the heat insulating coat 41 is not provided on the inner wall of the pipe 16, and the pipe inlet inner wall temperature PIW2 shows a case where the heat insulating coat 41 is provided on the inner wall of the pipe 16. The distributor outlet gas temperature DOG1 indicates a case where the heat insulating coat 41 is not provided on the inner wall of the pipe 16, and the distributor outlet gas temperature DOG2 shows a case where the heat insulating coat 41 is provided on the inner wall of the pipe 16. The distributor outlet inner wall temperature DOWN 1 indicates the case where the heat insulating coat 41 is not provided on the inner wall of the pipe 16, and the distributor outlet inner wall temperature DOWN 2 indicates the case where the heat insulating coat 41 is provided on the inner wall of the pipe 16.
　図６に示すように、時刻ｔ１にて、上記した各温度ＰＩＧ，ＰＩＷ１，ＰＩＷ２，ＤＯＧ１，ＤＯＧ２，ＤＯＷ１，ＤＯＷ２，ＴＨＷが低温である所定温度Ｔ０（例えば、「２５℃」）のときに、エンジン１が始動を開始すると、冷却水温度ＴＨＷは昇温を開始し、やがて時刻ｔ７にて上限温度であるエンジンサーモ温度Ｔ３に達する。 As shown in FIG. 6, at time t1, when the above-mentioned temperatures PIG, PIW1, PIW2, DOG1, DOG2, DOW1, DOWN2, THW are at a predetermined temperature T0 (for example, “25 ° C.”), which is a low temperature, When the engine 1 starts to start, the cooling water temperature THW starts to raise the temperature, and eventually reaches the engine thermo temperature T3 which is the upper limit temperature at time t7.
　ここで、時刻ｔ２にて、冷却水温度ＴＨＷがＥＧＲ開始温度Ｔ１（例えば、「４０℃」）に達すると、ＥＧＲ弁１４とバイパス弁２４が開弁する（この場合、時刻ｔ５にてバイパス弁２４のみが閉弁する）と、ＥＧＲ通路１２にＥＧＲガスが流れることから、冷却水温度ＴＨＷ以外の各種温度ＰＩＧ，ＰＩＷ１，ＰＩＷ２，ＤＯＧ１，ＤＯＧ２，ＤＯＷ１，ＤＯＷ２も昇温を開始する。このとき、配管入口ガス温度ＰＩＧは、時刻ｔ７へ向けて他より高く昇温する。これに対し、配管入口内壁温度ＰＩＷ１，ＰＩＷ２は、時刻ｔ７にて、他の温度Ｔ０～Ｔ４よりも高い芳香族ナイロン耐熱温度Ｔ５を超えて高くなる。ここでは、断熱コート４１を設けない場合の配管入口内壁温度ＰＩＷ１の方が、断熱コート４１を設けた場合の配管入口内壁温度ＰＩＷ２よりも高くなる。 Here, when the cooling water temperature THW reaches the EGR start temperature T1 (for example, “40 ° C.”) at time t2, the EGR valve 14 and the bypass valve 24 are opened (in this case, the bypass valve is opened at time t5). When only 24 is closed), EGR gas flows through the EGR passage 12, so that various temperatures other than the cooling water temperature THW, PIG, PIW1, PIW2, DOG1, DOG2, DOW1, and DOW2, also start to raise the temperature. At this time, the pipe inlet gas temperature PIG rises higher than the others toward time t7. On the other hand, the pipe inlet inner wall temperatures PIW1 and PIW2 become higher than the aromatic nylon heat resistant temperature T5, which is higher than the other temperatures T0 to T4, at time t7. Here, the pipe inlet inner wall temperature PIW1 when the heat insulating coat 41 is not provided is higher than the pipe inlet inner wall temperature PIW2 when the heat insulating coat 41 is provided.
　一方、分配器出口内壁温度ＤＯＷ１，ＤＯＷ２は、時刻ｔ７にて、露点温度Ｔ２よりも高くなり、分配器出口ガス温度ＤＯＧ１，ＤＯＧ２は、時刻ｔ７にて、エンジンサーモ温度Ｔ３よりも高く、６６ナイロン耐熱温度Ｔ４よりも低くなる。ここでは、断熱コート４１を設けた場合の分配器出口内壁温度ＤＯＷ２と分配器出口ガス温度ＤＯＧ２の方が、断熱コート４１を設けない場合の分配器出口内壁温度ＤＯＷ１と分配器出口ガス温度ＤＯＧ１よりも高くなる。これにより、断熱コート４１を設けた場合の方が、ＥＧＲガス分配器１５へ流れるＥＧＲガスの温度低下を抑制できることがわかる。しかも、断熱コート４１を設けない場合の分配器出口内壁温度ＤＯＷ１が、時刻ｔ６と時刻ｔ７との間の時刻で露点温度Ｔ２に達したのに対し、断熱コート４１を設けた場合の分配器出口内壁温度ＤＯＷ２は、時刻ｔ３と時刻ｔ４との間の時刻で露点温度Ｔ２に達している。これにより、断熱コート４１を設けた場合の方が、エンジン始動後のより早い時期から、ＥＧＲガス分配器１５で凝縮水を発生させることなくＥＧＲガスをエンジン１の各気筒へ還流できることがわかる。 On the other hand, the distributor outlet inner wall temperatures DOW1 and DOW2 are higher than the dew point temperature T2 at time t7, and the distributor outlet gas temperatures DOG1 and DOG2 are higher than the engine thermo temperature T3 at time t7, 66 nylon. The heat resistant temperature is lower than T4. Here, the distributor outlet inner wall temperature DOWN2 and the distributor outlet gas temperature DOG2 when the heat insulating coat 41 is provided are higher than the distributor outlet inner wall temperature DOWN1 and the distributor outlet gas temperature DOG1 when the heat insulating coat 41 is not provided. Will also be higher. From this, it can be seen that the temperature drop of the EGR gas flowing to the EGR gas distributor 15 can be suppressed more when the heat insulating coat 41 is provided. Moreover, the distributor outlet inner wall temperature DOWN1 when the heat insulating coat 41 is not provided reaches the dew point temperature T2 at the time between the time t6 and the time t7, whereas the distributor outlet when the heat insulating coat 41 is provided. The inner wall temperature DOWN2 has reached the dew point temperature T2 at a time between time t3 and time t4. From this, it can be seen that when the heat insulating coat 41 is provided, the EGR gas can be returned to each cylinder of the engine 1 from an earlier time after the engine is started without generating condensed water in the EGR gas distributor 15.
　なお、この実施形態では、ＥＧＲ弁１４の流路３４の内壁と配管１６の内壁に断熱コート４１を設けたので、図６に示すように、バイパス弁２４を時刻ｔ２で開弁し、時刻ｔ５で閉弁することができた。これにより、樹脂製の流路３４及び配管１６を過熱で溶損させることなく、バイパス通路２１ｇを通じて高温のＥＧＲガスを長く流すことができ、流路３４及び配管１６の見かけ上の耐熱性を向上させることができた。これに対し、流路３４及び配管１６の内壁に断熱コート４１を設けない場合は、流路３４及び配管１６の過熱による溶損を抑制するために、バイパス弁２４を遅くとも時刻ｔ３には閉弁させる必要があり、そのようにバイパス弁２４を閉弁させる時期が早くなる分だけ高温のＥＧＲガスを流路３４及び配管１６へ流せる時間が短くなってしまう。 In this embodiment, since the heat insulating coat 41 is provided on the inner wall of the flow path 34 of the EGR valve 14 and the inner wall of the pipe 16, the bypass valve 24 is opened at time t2 and at time t5 as shown in FIG. I was able to close the valve. As a result, the high-temperature EGR gas can flow for a long time through the bypass passage 21g without melting the resin flow path 34 and the pipe 16 due to overheating, and the apparent heat resistance of the flow path 34 and the pipe 16 is improved. I was able to make it. On the other hand, when the heat insulating coat 41 is not provided on the inner walls of the flow path 34 and the pipe 16, the bypass valve 24 is closed at the latest at time t3 in order to suppress melting damage due to overheating of the flow path 34 and the pipe 16. Therefore, the time for the high temperature EGR gas to flow to the flow path 34 and the pipe 16 is shortened by the earlier the time to close the bypass valve 24.
＜第２実施形態＞
　次に、第２実施形態について図面を参照して詳細に説明する。なお、以下の説明において、第１実施形態と同等の構成要素については、同一の符号を付して説明を省略し、異なった点を中心に説明する。 <Second Embodiment>
Next, the second embodiment will be described in detail with reference to the drawings. In the following description, the components equivalent to those in the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and the differences will be mainly described.
[配管における断熱コートの構成について]
　この実施形態では、配管１６における断熱コート４１の構成の点で第１実施形態と異なる。すなわち、図７に、配管１６からＥＧＲガス分配器１５までの構成を図３に準ずる構成図により示す。図８に、配管１６を図５に準ずる断面図により示す。図７、図８に示すように、この実施形態では、断熱コート４１の厚さが、配管１６の上流部ＵＳ、中流部ＭＳ及び下流部ＤＳの間で異なる厚さに形成される。すなわち、断熱コート４１の厚さは、配管１６の下流部ＤＳ（下流側）で最も小さく、中流部ＭＳ、上流部ＵＳ（上流側）の順に段階的に大きくなっている。すなわち、断熱コート４１は、その厚さが配管１６の下流部ＤＳ（下流側）から上流部ＵＳ（上流側）にかけて段階的に増加するように形成される。図７、図８では、断熱コート４１の段階的な厚さの変化を明確にするために誇張的に示している。なお、この実施形態でも、図７に２点鎖線Ｓ１で囲って示す配管１６のコーナ部で断熱コート４１の厚さを他の部位よりも厚くすることが望ましい。なお、図７では、ＥＧＲ弁１４の図示を省略しているが、ＥＧＲ弁１４の流路３４の内壁に設けられる断熱コート４１の厚さは、配管１６の上流部ＵＳの断熱コート４１の厚さと同じか、それよりも大きくすることができる。 [About the composition of the heat insulating coat in piping]
This embodiment differs from the first embodiment in the configuration of the heat insulating coat 41 in the pipe 16. That is, FIG. 7 shows the configuration from the pipe 16 to the EGR gas distributor 15 by a configuration diagram according to FIG. FIG. 8 shows the pipe 16 in a cross-sectional view according to FIG. As shown in FIGS. 7 and 8, in this embodiment, the thickness of the heat insulating coat 41 is formed to be different between the upstream portion US, the middle flow portion MS, and the downstream portion DS of the pipe 16. That is, the thickness of the heat insulating coat 41 is the smallest in the downstream portion DS (downstream side) of the pipe 16, and gradually increases in the order of the middle flow portion MS and the upstream portion US (upstream side). That is, the heat insulating coat 41 is formed so that its thickness gradually increases from the downstream portion DS (downstream side) to the upstream portion US (upstream side) of the pipe 16. In FIGS. 7 and 8, it is exaggerated to clarify the stepwise change in the thickness of the heat insulating coat 41. Also in this embodiment, it is desirable that the thickness of the heat insulating coat 41 is thicker than that of other portions at the corner portion of the pipe 16 surrounded by the two-dot chain line S1 in FIG. 7. Although the EGR valve 14 is not shown in FIG. 7, the thickness of the heat insulating coat 41 provided on the inner wall of the flow path 34 of the EGR valve 14 is the thickness of the heat insulating coat 41 of the upstream portion US of the pipe 16. Can be the same as or larger than that.
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１によれば、第１実施形態の作用及び効果に加え、次のような作用及び効果を得ることができる。すなわち、この実施形態で、断熱コート４１は、その厚さが配管１６の下流部ＤＳ（下流側）から上流部ＵＳ（上流側）にかけて段階的に増加するように形成される。ここで、配管１６を流れるＥＧＲガスの温度は、配管１６の上流部ＵＳで高く、中流部ＭＳ、下流部ＤＳにかけて低下する。従って、配管１６は、その上流部ＵＳから下流部ＤＳにかけて、そこを流れるＥＧＲガスの温度変化に合わせて断熱性が設定される。このため、配管１６を流れるＥＧＲガスの温度変化に合わせて、配管１６の上流部ＵＳから下流部ＤＳにかけてＥＧＲガスを有効に保温できると共に、配管１６の耐熱性を有効に確保できる。 [About the action and effect of the EGR device]
According to the EGR device 11 of this embodiment, the following actions and effects can be obtained in addition to the actions and effects of the first embodiment. That is, in this embodiment, the heat insulating coat 41 is formed so that its thickness gradually increases from the downstream portion DS (downstream side) to the upstream portion US (upstream side) of the pipe 16. Here, the temperature of the EGR gas flowing through the pipe 16 is high in the upstream portion US of the pipe 16, and decreases toward the middle flow portion MS and the downstream portion DS. Therefore, the heat insulating property of the pipe 16 is set from the upstream portion US to the downstream portion DS according to the temperature change of the EGR gas flowing therethrough. Therefore, the EGR gas can be effectively kept warm from the upstream portion US to the downstream portion DS of the pipe 16 in accordance with the temperature change of the EGR gas flowing through the pipe 16, and the heat resistance of the pipe 16 can be effectively secured.
＜第３実施形態＞
　次に、第３実施形態について図面を参照して詳細に説明する。 <Third Embodiment>
Next, the third embodiment will be described in detail with reference to the drawings.
[ＥＧＲ弁の配置について]
　この実施形態では、ＥＧＲ通路１２におけるＥＧＲ弁１４の配置の点で前記各実施形態と異なる。すなわち、図９に、ＥＧＲクーラ１３からＥＧＲガス分配器１５までの構成を図２に準ずる構成図により示す。図９に示すように、この実施形態では、ＥＧＲクーラ１３のケーシング２１の流路部２１ｆに、ＥＧＲ弁１４を組み付けるための組付部２１ｈが設けられ、その組付部２１ｈの孔にＥＧＲ弁１４のハウジング４６が組み入れられる（ドロップイン）ことで、ＥＧＲ弁１４がＥＧＲクーラ１３に取り付けられる。ＥＧＲ弁１４のハウジング４６は、ＥＧＲガスを保温する機能を有する樹脂材により構成され、流路３４と、弁体３６が着座する弁座３５が設けられる。ＥＧＲクーラ１３の出口２１ｃには、樹脂材により構成される配管１６の入口１６ａが接続される。配管１６の内壁には、破線で示す断熱コート４１が設けられる。この実施形態でも、断熱コート４１を、配管１６の上流側から下流側にかけて一律の厚さで形成したり、配管１６の下流側から上流側にかけ段階的又は徐々に増加するように形成したりすることができる。また、配管１６のコーナ部で断熱コート４１の厚さを他の部位よりも特に厚くすることができる。 [About the arrangement of EGR valves]
This embodiment differs from each of the above embodiments in that the EGR valve 14 is arranged in the EGR passage 12. That is, FIG. 9 shows the configuration from the EGR cooler 13 to the EGR gas distributor 15 by a configuration diagram according to FIG. 2. As shown in FIG. 9, in this embodiment, an assembly portion 21h for assembling the EGR valve 14 is provided in the flow path portion 21f of the casing 21 of the EGR cooler 13, and the EGR valve is provided in the hole of the assembly portion 21h. By incorporating (drop-in) the housing 46 of 14, the EGR valve 14 is attached to the EGR cooler 13. The housing 46 of the EGR valve 14 is made of a resin material having a function of retaining heat of the EGR gas, and is provided with a flow path 34 and a valve seat 35 on which the valve body 36 is seated. The inlet 16a of the pipe 16 made of a resin material is connected to the outlet 21c of the EGR cooler 13. A heat insulating coat 41 shown by a broken line is provided on the inner wall of the pipe 16. Also in this embodiment, the heat insulating coat 41 is formed to have a uniform thickness from the upstream side to the downstream side of the pipe 16, or is formed so as to gradually or gradually increase from the downstream side to the upstream side of the pipe 16. be able to. Further, the thickness of the heat insulating coat 41 can be made particularly thicker at the corner portion of the pipe 16 than at other portions.
　加えて、この実施形態では、ＥＧＲ弁１４の流路３４は、入口３４ａと出口３４ｂを含み、流路３４の入口３４ａが熱交換器２３の出口２３ｂに略隣接して配置される。 In addition, in this embodiment, the flow path 34 of the EGR valve 14 includes an inlet 34a and an outlet 34b, and the inlet 34a of the flow path 34 is arranged substantially adjacent to the outlet 23b of the heat exchanger 23.
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１によれば、第１実施形態とほぼ同等の作用及び効果に加え、次のような作用及び効果を得ることができる。すなわち、この実施形態では、ＥＧＲ弁１４がＥＧＲクーラ１３の組付部２１ｈに組み付けられるので、ＥＧＲ装置１１の全体をコンパクト化することができる。 [About the action and effect of the EGR device]
According to the EGR device 11 of this embodiment, the following actions and effects can be obtained in addition to the actions and effects substantially equivalent to those of the first embodiment. That is, in this embodiment, since the EGR valve 14 is assembled to the assembly portion 21h of the EGR cooler 13, the entire EGR device 11 can be made compact.
　また、この実施形態の構成によれば、ＥＧＲ弁１４の流路３４の入口３４ａが熱交換器２３の出口２３ｂに略隣接して配置されるので、熱交換器２３の出口２３ｂから流れ出たばかりのＥＧＲガスがＥＧＲ弁１４の樹脂製の流路３４の入口３４ａに早期に流れ入る。このため、熱交換器２３の出口２３ｂから流れ出たばかりのＥＧＲガスの温度低下をＥＧＲ弁１４の流路３４により抑制することができる。 Further, according to the configuration of this embodiment, since the inlet 34a of the flow path 34 of the EGR valve 14 is arranged substantially adjacent to the outlet 23b of the heat exchanger 23, it has just flowed out from the outlet 23b of the heat exchanger 23. The EGR gas flows into the inlet 34a of the resin flow path 34 of the EGR valve 14 at an early stage. Therefore, the temperature drop of the EGR gas that has just flowed out from the outlet 23b of the heat exchanger 23 can be suppressed by the flow path 34 of the EGR valve 14.
＜第４実施形態＞
　次に、第４実施形態について図面を参照して詳細に説明する。 <Fourth Embodiment>
Next, the fourth embodiment will be described in detail with reference to the drawings.
[ＥＧＲ弁の配置について]
　この実施形態では、ＥＧＲ通路１２におけるＥＧＲ弁１４の配置の点で前記各実施形態と異なる。すなわち、図１０に、ＥＧＲクーラ１３からＥＧＲガス分配器１５までの構成を図２に準ずる構成図により示す。図１０に示すように、この実施形態では、樹脂材により構成されるＥＧＲガス分配器１５の入口側に、ＥＧＲ弁１４を組み付けるための組付部１５ｃが設けられ、その組付部１５ｃの孔にＥＧＲ弁１４のハウジング４６が組み入れられる（ドロップイン）ことで、ＥＧＲ弁１４がＥＧＲガス分配器１５に取り付けられる。ＥＧＲ弁１４のハウジング４６は、ＥＧＲガスを保温する機能を有する樹脂材により構成され、流路３４と、弁体３６が着座する弁座３５が設けられる。樹脂材により構成される組付部１５ｃの底部には入口１５ｄが設けられ、その入口１５ｄには、配管１６の出口１６ｂが接続される。配管１６の内壁及びハウジング４６の流路３４の内壁には、破線で示す断熱コート４１が設けられる。この実施形態でも、断熱コート４１を、配管１６の上流側から下流側にかけて一律の厚さで形成したり、配管１６の下流側から上流側にかけ段階的又は徐々に増加するように形成したりすることもできる。 [About the arrangement of EGR valves]
This embodiment differs from each of the above embodiments in that the EGR valve 14 is arranged in the EGR passage 12. That is, FIG. 10 shows the configuration from the EGR cooler 13 to the EGR gas distributor 15 with a configuration diagram according to FIG. 2. As shown in FIG. 10, in this embodiment, an assembly portion 15c for assembling the EGR valve 14 is provided on the inlet side of the EGR gas distributor 15 made of a resin material, and a hole of the assembly portion 15c is provided. The EGR valve 14 is attached to the EGR gas distributor 15 by incorporating the housing 46 of the EGR valve 14 into the EGR valve 14 (drop-in). The housing 46 of the EGR valve 14 is made of a resin material having a function of retaining heat of the EGR gas, and is provided with a flow path 34 and a valve seat 35 on which the valve body 36 is seated. An inlet 15d is provided at the bottom of the assembly portion 15c made of a resin material, and the outlet 16b of the pipe 16 is connected to the inlet 15d. A heat insulating coat 41 shown by a broken line is provided on the inner wall of the pipe 16 and the inner wall of the flow path 34 of the housing 46. Also in this embodiment, the heat insulating coat 41 is formed to have a uniform thickness from the upstream side to the downstream side of the pipe 16, or is formed so as to gradually or gradually increase from the downstream side to the upstream side of the pipe 16. You can also do it.
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１によれば、第１実施形態とほぼ同等の作用及び効果に加え、次のような作用及び効果を得ることができる。すなわち、この実施形態では、ＥＧＲ弁１４がＥＧＲガス分配器１５の組付部１５ｃに組み付けられるので、ＥＧＲ装置１１の全体をコンパクト化することができる。 [About the action and effect of the EGR device]
According to the EGR device 11 of this embodiment, the following actions and effects can be obtained in addition to the actions and effects substantially equivalent to those of the first embodiment. That is, in this embodiment, since the EGR valve 14 is assembled to the assembly portion 15c of the EGR gas distributor 15, the entire EGR device 11 can be made compact.
＜第５実施形態＞
　次に、第５実施形態について図面を参照して詳細に説明する。 <Fifth Embodiment>
Next, the fifth embodiment will be described in detail with reference to the drawings.
[保温手段の構成について]
　この実施形態では、配管１６における保温手段の構成の点で前記各実施形態と異なる。すなわち、図１１に、配管１６をその長手方向と直交する方向に切断した断面図により示す。図１１に示すように、この実施形態の保温手段は、配管１６（中流通路部ＭＳＰ）を加熱するための加熱部５０により構成される。この実施形態で、加熱部５０は、樹脂材により構成される配管１６の内壁に設けられ、通電により発熱する発熱被膜５１により構成される。図１１において、発熱被膜５１には、プラス端子５３ａを有するプラス電極５３と、マイナス端子５４ａを有するマイナス電極５４とが接続される。そして、プラス端子５３ａ及びマイナス端子５４ａからプラス電極５３及びマイナス電極５４を介して発熱被膜５１が通電されるようになっている。 [About the configuration of heat insulating means]
This embodiment is different from each of the above-described embodiments in the configuration of the heat insulating means in the pipe 16. That is, FIG. 11 shows a cross-sectional view of the pipe 16 cut in a direction orthogonal to the longitudinal direction thereof. As shown in FIG. 11, the heat insulating means of this embodiment is composed of a heating unit 50 for heating the pipe 16 (middle flow passage unit MSP). In this embodiment, the heating unit 50 is provided on the inner wall of the pipe 16 made of a resin material, and is composed of a heat generating film 51 that generates heat by energization. In FIG. 11, a positive electrode 53 having a positive terminal 53a and a negative electrode 54 having a negative terminal 54a are connected to the heat generating film 51. Then, the heat generating film 51 is energized from the positive terminal 53a and the negative terminal 54a via the positive electrode 53 and the negative electrode 54.
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１構成によれば、第１実施形態とほぼ同等の作用及び効果に加え、次のような作用及び効果を得ることができる。すなわち、保温手段が加熱部５０であることから、中流通路部ＭＳＰを構成する配管１６を加熱部５０により加熱することで、その配管１６の保温と昇温の両方が可能となる。より具体的には、プラス電極５３及びマイナス電極５４を介して発熱被膜５１を通電により発熱させることで、配管１６（中流通路部ＭＳＰ）の内壁が任意のタイミングで、面的に広く加熱される。このため、配管１６を流れるＥＧＲガスを有効に保温することができる。また、配管１６を流れるＥＧＲガスを応答性良く、安定的に保温することができる。この結果、ＥＧＲガス分配器１５へ流れるＥＧＲガスを有効に保温することができる。 [About the action and effect of the EGR device]
According to the EGR device 11 configuration of this embodiment, the following actions and effects can be obtained in addition to the actions and effects substantially equivalent to those of the first embodiment. That is, since the heat retaining means is the heating unit 50, by heating the pipe 16 constituting the middle flow passage portion MSP by the heating unit 50, both the heat retention and the temperature rise of the pipe 16 become possible. More specifically, by generating heat by energizing the heating film 51 via the positive electrode 53 and the negative electrode 54, the inner wall of the pipe 16 (middle flow passage portion MSP) is heated over a wide area at an arbitrary timing. To. Therefore, the EGR gas flowing through the pipe 16 can be effectively kept warm. Further, the EGR gas flowing through the pipe 16 can be responsively and stably kept warm. As a result, the EGR gas flowing to the EGR gas distributor 15 can be effectively kept warm.
＜第６実施形態＞
　次に、第６実施形態について図面を参照して詳細に説明する。 <Sixth Embodiment>
Next, the sixth embodiment will be described in detail with reference to the drawings.
[保温手段の構成について]
　この実施形態では、配管１６における保温手段の構成の点で前記各実施形態と異なる。すなわち、図１２に、配管１６をその長手方向と直交する方向に切断した断面図により示す。図１２に示すように、この実施形態の保温手段は、ＥＧＲガスを保温する機能を有する樹脂材より構成される配管１６（中流通路部ＭＳＰ）の外側に設けられる空気層５６により構成される。配管１６は、外管１６ｃと内管１６ｄにより二重管構造をなし、両管１６ｃ，１６ｄの間に空気層５６が形成される。 [About the configuration of heat insulating means]
This embodiment is different from each of the above-described embodiments in the configuration of the heat insulating means in the pipe 16. That is, FIG. 12 shows a cross-sectional view of the pipe 16 cut in a direction orthogonal to the longitudinal direction thereof. As shown in FIG. 12, the heat insulating means of this embodiment is composed of an air layer 56 provided on the outside of a pipe 16 (middle flow passage portion MSP) made of a resin material having a function of keeping heat of EGR gas. .. The pipe 16 has a double pipe structure formed by the outer pipe 16c and the inner pipe 16d, and an air layer 56 is formed between the two pipes 16c and 16d.
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１によれば、第１実施形態とほぼ同等の作用及び効果に加え、次のような作用及び効果を得ることができる。すなわち、保温手段が空気層５６であることから、保温手段のために特別な部材を使う必要がない。このため、保温手段の分だけＥＧＲ装置１１を構成する部品点数を減らすことができる。この空気層５６によっても、配管１６を流れるＥＧＲガスを有効に保温することができる。 [About the action and effect of the EGR device]
According to the EGR device 11 of this embodiment, the following actions and effects can be obtained in addition to the actions and effects substantially equivalent to those of the first embodiment. That is, since the heat insulating means is the air layer 56, it is not necessary to use a special member for the heat insulating means. Therefore, the number of parts constituting the EGR device 11 can be reduced by the amount of the heat insulating means. The air layer 56 can also effectively keep the EGR gas flowing through the pipe 16 warm.
＜第７実施形態＞
　次に、第７実施形態について図面を参照して詳細に説明する。 <7th Embodiment>
Next, the seventh embodiment will be described in detail with reference to the drawings.
[バイパス通路の構成について]
　この実施形態では、ＥＧＲクーラ１３に設けられるバイパス通路２１ｇの構成の点で前記各実施形態と異なる。すなわち、図１３に、ＥＧＲクーラ１３からＥＧＲガス分配器１５までの構成を図２に準ずる構成図により示す。図１３に示すように、この実施形態では、バイパス通路２１ｇの一部を冷却するための冷却部５８を更に設けた点で第１実施形態と構成が異なる。冷却部５８は、バイパス通路２１ｇの長手方向の一部にてその周囲に設けられ、エンジン１の冷却水が循環するようになっている。 [About the configuration of the bypass passage]
This embodiment differs from each of the above embodiments in that the bypass passage 21g provided in the EGR cooler 13 is configured. That is, FIG. 13 shows the configuration from the EGR cooler 13 to the EGR gas distributor 15 by a configuration diagram according to FIG. 2. As shown in FIG. 13, this embodiment differs from the first embodiment in that a cooling unit 58 for cooling a part of the bypass passage 21g is further provided. The cooling unit 58 is provided around a part of the bypass passage 21g in the longitudinal direction so that the cooling water of the engine 1 circulates.
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１によれば、前記第１実施形態と同等の作用及び効果に加え、次のような作用及び効果を得ることができる。すなわち、この実施形態では、バイパス通路２１ｇを流れるＥＧＲガスが冷却部５８により冷却されるので、バイパス通路２１ｇからＥＧＲ弁１４の流路３４及び配管１６（中流通路部ＭＳＰ）へ流入するＥＧＲガスの温度が低下する。このため、ＥＧＲガスの温度を、流路３４及び配管１６（中流通路部ＭＳＰ）を構成する樹脂材の耐熱温度に近付けることができ、バイパス通路２１ｇに高温のＥＧＲガスが流れても、ＥＧＲガスによる流路３４及び配管１６（中流通路部ＭＳＰ）の過熱による溶損を抑制することができる。 [About the action and effect of the EGR device]
According to the EGR device 11 of this embodiment, in addition to the same actions and effects as those of the first embodiment, the following actions and effects can be obtained. That is, in this embodiment, since the EGR gas flowing through the bypass passage 21g is cooled by the cooling unit 58, the EGR gas flowing from the bypass passage 21g into the flow path 34 of the EGR valve 14 and the pipe 16 (middle flow passage portion MSP). The temperature drops. Therefore, the temperature of the EGR gas can be brought close to the heat resistant temperature of the resin material constituting the flow path 34 and the pipe 16 (middle flow passage portion MSP), and even if the high temperature EGR gas flows through the bypass passage 21 g, the EGR gas can be brought close to the heat resistant temperature. It is possible to suppress melting damage due to overheating of the flow path 34 and the pipe 16 (middle flow passage portion MSP) due to gas.
＜第８実施形態＞
　次に、第８実施形態について図面を参照して詳細に説明する。 <8th Embodiment>
Next, the eighth embodiment will be described in detail with reference to the drawings.
[保温手段の構成について]
　この実施形態では、ＥＧＲ弁１４及び配管１６における保温手段の構成の点で前記各実施形態と異なる。すなわち、図１４に、ＥＧＲクーラ１３からＥＧＲガス分配器１５までの構成を図２に準ずる構成図により示す。前記第１実施形態では、ＥＧＲ弁１４の流路３４の内壁と、樹脂材（６６ナイロン）により構成される配管１６の内壁に保温手段としての断熱コート４１を設けた。これに対し、この実施形態では、断熱コートを省略し、断熱コートを設ける代わりに、ＥＧＲ弁１４の流路３４及び配管１６を、ＥＧＲガスを保温する機能を有する樹脂材（例えば、「芳香族ナイロン」）により形成することで保温手段が構成される。ここで、流路３４については、内ハウジング３９及び流路部材４０を、例えば、芳香族ナイロンにより形成することになる。 [About the configuration of heat insulating means]
This embodiment is different from each of the above-described embodiments in the configuration of the heat insulating means in the EGR valve 14 and the pipe 16. That is, FIG. 14 shows the configuration from the EGR cooler 13 to the EGR gas distributor 15 with a configuration diagram according to FIG. 2. In the first embodiment, a heat insulating coat 41 as a heat insulating means is provided on the inner wall of the flow path 34 of the EGR valve 14 and the inner wall of the pipe 16 made of a resin material (66 nylon). On the other hand, in this embodiment, instead of omitting the heat insulating coat and providing the heat insulating coat, the flow path 34 and the pipe 16 of the EGR valve 14 are made of a resin material having a function of retaining heat of the EGR gas (for example, "aromatic". The heat insulating means is configured by forming it from "nylon"). Here, with respect to the flow path 34, the inner housing 39 and the flow path member 40 are formed of, for example, aromatic nylon.
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１によれば、第１実施形態とほぼ同等の作用及び効果に加え、次のような作用及び効果を得ることができる。すなわち、ＥＧＲ弁１４の流路３４及び配管１６を構成する樹脂材を、例えば、芳香族ナイロンにより構成した場合、芳香族ナイロンは、６６ナイロンよりも耐熱温度が高いことから、流路３４及び配管１６自体に保温性が得られ、保温手段を別途設ける必要がない。このため、保温手段を備えたＥＧＲ装置１１の製造を容易化することができる。 [About the action and effect of the EGR device]
According to the EGR device 11 of this embodiment, the following actions and effects can be obtained in addition to the actions and effects substantially equivalent to those of the first embodiment. That is, when the resin material constituting the flow path 34 and the pipe 16 of the EGR valve 14 is made of, for example, aromatic nylon, the heat resistant temperature of the aromatic nylon is higher than that of 66 nylon, so that the flow path 34 and the pipe The heat retaining property is obtained in the 16 itself, and it is not necessary to separately provide a heat retaining means. Therefore, it is possible to facilitate the manufacture of the EGR device 11 provided with the heat insulating means.
＜第９実施形態＞
　次に、第９実施形態について図面を参照して詳細に説明する。 <9th embodiment>
Next, the ninth embodiment will be described in detail with reference to the drawings.
[加熱部の構成について]
　この実施形態では、配管１６における加熱部５０の構成の点で前記各実施形態と異なる。すなわち、図１５に、ＥＧＲクーラ１３からＥＧＲガス分配器１５までの構成を図９に準ずる構成図により示す。前記第３実施形態では、ＥＧＲ弁１４の流路３４の内壁を樹脂材により構成すると共に、樹脂材により構成される配管１６（中流通路部ＭＳＰ）の内壁に保温手段としての断熱コート４１を設けた。これに対し、この実施形態では、配管１６（中流通路部ＭＳＰ）において、断熱コートを省略し、断熱コートを設ける代わりに、配管１６の流路長手方向に沿って温水が流れる温水通路６１が形成される。温水通路６１には、例えば、エンジン１を冷却することで温められた温水としてのエンジン冷却水が流れるようになっている。温水通路６１は、配管１６の入口１６ａの近傍に設けられた入口６１ａと、配管１６の出口１６ｂの近傍に設けられた出口６１ｂを含む。エンジン冷却水は、温水通路６１に対し、その入口６１ａから流れ込み、その出口６１ｂから流れ出るようになっている。図１６に、配管１６を図１５のＣ－Ｃ線断面図により示す。図１６に示すように、この実施形態の配管１６は、二重管構造をなし、温水通路６１を挟んだ外側の外管１６ｃと内側の内管１６ｄとを含み、それらが分割されることなく一体に形成される。この実施形態では、外管１６ｃの厚みが内管１６ｄの厚みより大きくなっている。温水通路６１は、この開示技術の加熱部５０の一例に相当する。 [About the configuration of the heating part]
This embodiment is different from each of the above-described embodiments in the configuration of the heating unit 50 in the pipe 16. That is, FIG. 15 shows the configuration from the EGR cooler 13 to the EGR gas distributor 15 with a configuration diagram according to FIG. In the third embodiment, the inner wall of the flow path 34 of the EGR valve 14 is made of a resin material, and the inner wall of the pipe 16 (middle flow passage portion MSP) made of the resin material is provided with a heat insulating coat 41 as a heat insulating means. Provided. On the other hand, in this embodiment, in the pipe 16 (middle flow passage portion MSP), instead of omitting the heat insulating coat and providing the heat insulating coat, the hot water passage 61 through which hot water flows along the longitudinal direction of the flow path of the pipe 16 is provided. It is formed. For example, engine cooling water as hot water warmed by cooling the engine 1 flows through the hot water passage 61. The hot water passage 61 includes an inlet 61a provided in the vicinity of the inlet 16a of the pipe 16 and an outlet 61b provided in the vicinity of the outlet 16b of the pipe 16. The engine cooling water flows into the hot water passage 61 from the inlet 61a and flows out from the outlet 61b. FIG. 16 shows the pipe 16 with a cross-sectional view taken along the line CC of FIG. As shown in FIG. 16, the pipe 16 of this embodiment has a double pipe structure, includes an outer outer pipe 16c and an inner inner pipe 16d sandwiching the hot water passage 61, and they are not divided. It is formed integrally. In this embodiment, the thickness of the outer tube 16c is larger than the thickness of the inner tube 16d. The hot water passage 61 corresponds to an example of the heating unit 50 of this disclosed technique.
　ここで、図１５に示すように、この実施形態では、ＥＧＲ弁１４と配管１６とが、ＥＧＲ弁１４の出口側にてケーシング２１の出口２１ｃに設けられる弁出口フランジ２１ｉと、配管１６の入口側に設けられる管入口フランジ１６ｅとを介して接続される。また、配管１６とＥＧＲガス分配器１５（下流通路部ＤＳＰ）とが、配管１６の出口側に設けられる管出口フランジ１６ｆと、ＥＧＲガス分配器１５の入口側に設けられる分配器入口フランジ１５ｅ（通路部入口フランジ）とを介して接続される。 Here, as shown in FIG. 15, in this embodiment, the EGR valve 14 and the pipe 16 are the valve outlet flange 21i provided at the outlet 21c of the casing 21 on the outlet side of the EGR valve 14, and the inlet of the pipe 16. It is connected via a pipe inlet flange 16e provided on the side. Further, the pipe 16 and the EGR gas distributor 15 (downstream passage portion DSP) are provided with a pipe outlet flange 16f provided on the outlet side of the pipe 16 and a distributor inlet flange 15e provided on the inlet side of the EGR gas distributor 15. It is connected via the passage portion entrance flange).
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１によれば、第５実施形態とほぼ同等の作用及び効果を得ることができる。すなわち、この実施形態のＥＧＲ装置１１は、中流通路部ＭＳＰを構成する配管１６の保温手段が加熱部５０であることから、配管１６を加熱部５０により加熱することで、その配管１６の保温と昇温の両方が可能となる。より具体的には、温水通路６１にエンジン冷却水（温水）が流れることで、配管１６（中流通路部ＭＳＰ）の内壁が面的に広く加熱される。このため、配管１６を流れるＥＧＲガスを有効に保温することができる。また、配管１６を流れるＥＧＲガスを応答性良く、安定的に保温することができる。この結果、ＥＧＲガス分配器１５へ流れるＥＧＲガスを有効に保温することができる。 [About the action and effect of the EGR device]
According to the EGR device 11 of this embodiment, it is possible to obtain almost the same operation and effect as that of the fifth embodiment. That is, in the EGR device 11 of this embodiment, since the heat insulating means of the pipe 16 constituting the middle flow passage portion MSP is the heating unit 50, the pipe 16 is heated by the heating unit 50 to keep the pipe 16 warm. And temperature rise are possible. More specifically, the engine cooling water (hot water) flows through the hot water passage 61, so that the inner wall of the pipe 16 (middle flow passage portion MSP) is heated widely in terms of surface. Therefore, the EGR gas flowing through the pipe 16 can be effectively kept warm. Further, the EGR gas flowing through the pipe 16 can be responsively and stably kept warm. As a result, the EGR gas flowing to the EGR gas distributor 15 can be effectively kept warm.
　この実施形態の構成によれば、加熱部５０が、温水が流れる温水通路６１により構成されるので、エンジン１を冷却することで温められたエンジン冷却水を温水として利用し、温水通路６１へ流すことが可能となる。このため、第５実施形態とは異なり、電気的構成を用いることなく加熱することができる。また、配管１６のＥＧＲガスの流れが停止しても、温水通路６１の温水により配管１６の加熱が継続されるので、配管１６をＥＧＲガスが再び流れたときに、配管１６での凝縮水の発生を抑制することができる。 According to the configuration of this embodiment, since the heating unit 50 is composed of the hot water passage 61 through which the hot water flows, the engine cooling water warmed by cooling the engine 1 is used as hot water and flows to the hot water passage 61. It becomes possible. Therefore, unlike the fifth embodiment, heating can be performed without using an electric configuration. Further, even if the flow of the EGR gas in the pipe 16 is stopped, the heating of the pipe 16 is continued by the hot water in the hot water passage 61. Therefore, when the EGR gas flows through the pipe 16 again, the condensed water in the pipe 16 is continued. Occurrence can be suppressed.
　この実施形態の構成によれば、配管１６（中流通路部ＭＳＰ）は、温水通路６１を挟んだ外管１６ｃの厚みが内管１６ｄの厚みよりも大きいので、温水の熱が内管１６ｄの内壁には伝わり易く、外管１６ｃの外壁へは逃げ難い。このため、内管１６ｄの内部を流れるＥＧＲガスの加熱性及び保温性を高めることができる。 According to the configuration of this embodiment, in the pipe 16 (middle flow passage portion MSP), the thickness of the outer pipe 16c sandwiching the hot water passage 61 is larger than the thickness of the inner pipe 16d, so that the heat of the hot water is the inner pipe 16d. It is easily transmitted to the inner wall and difficult to escape to the outer wall of the outer pipe 16c. Therefore, the heatability and heat retention of the EGR gas flowing inside the inner tube 16d can be enhanced.
　この実施形態の構成によれば、温水通路６１が配管１６（中流通路部ＭＳＰ）の流路長手方向に沿って設けられるので、配管１６でのＥＧＲガスの流れに沿ってＥＧＲガスが長く温められる。この意味でも、配管１６を流れるＥＧＲガスの加熱性及び保温性を更に高めることができる。 According to the configuration of this embodiment, since the hot water passage 61 is provided along the flow path longitudinal direction of the pipe 16 (middle flow passage portion MSP), the EGR gas is warmed long along the flow of the EGR gas in the pipe 16. Will be. In this sense as well, the heatability and heat retention of the EGR gas flowing through the pipe 16 can be further enhanced.
＜第１０実施形態＞
　次に、第１０実施形態について図面を参照して詳細に説明する。 <10th Embodiment>
Next, the tenth embodiment will be described in detail with reference to the drawings.
[加熱部の構成について]
　この実施形態では、配管１６において、加熱部５０としての温水通路６１の構成の点で前記第９実施形態と異なる。すなわち、図１７に、配管１６の構成を図１６に準ずる断面図により示す。図１７に示すように、この実施形態の配管１６は、その上側を形成する上管部６２と、その下側を形成する下管部６３とを接合することで構成される。この実施形態では、下管部６３のみに温水通路６１が形成され、上管部６２には温水通路６１が形成されていない。すなわち、下管部６３は、温水通路６１を挟んだ外管１６ｃと内管１６ｄにより形成される。上管部６２は、下管部６３の内管１６ｄと同等の外径を有し、下管部６３との接合部には、その長手方向に沿ってフランジ６２ａが形成される。そして、上管部６２のフランジ６２ａと、下管部６３の上端面６３ａとが溶着６４により接合されることで配管１６が形成される。 [About the configuration of the heating part]
This embodiment is different from the ninth embodiment in the configuration of the hot water passage 61 as the heating unit 50 in the pipe 16. That is, FIG. 17 shows the configuration of the pipe 16 in a cross-sectional view according to FIG. As shown in FIG. 17, the pipe 16 of this embodiment is configured by joining the upper pipe portion 62 forming the upper side thereof and the lower pipe portion 63 forming the lower side thereof. In this embodiment, the hot water passage 61 is formed only in the lower pipe portion 63, and the hot water passage 61 is not formed in the upper pipe portion 62. That is, the lower pipe portion 63 is formed by the outer pipe 16c and the inner pipe 16d sandwiching the hot water passage 61. The upper pipe portion 62 has an outer diameter equivalent to that of the inner pipe 16d of the lower pipe portion 63, and a flange 62a is formed at the joint portion with the lower pipe portion 63 along the longitudinal direction thereof. Then, the flange 62a of the upper pipe portion 62 and the upper end surface 63a of the lower pipe portion 63 are joined by welding 64 to form the pipe 16.
　図１７には、配管１６の下側に温水通路６１を設けたが、図１７の上管部６２と下管部６３を上下逆に配置することで、配管１６の上側に温水通路６１を設けることもできる。 In FIG. 17, the hot water passage 61 is provided on the lower side of the pipe 16, but by arranging the upper pipe portion 62 and the lower pipe portion 63 upside down in FIG. 17, the hot water passage 61 is provided on the upper side of the pipe 16. You can also do it.
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１によれば、配管１６に接する温水通路６１の面積は少なくなるものの、第９実施形態とほぼ同等の作用及び効果を得ることができる。 [About the action and effect of the EGR device]
According to the EGR device 11 of this embodiment, although the area of the hot water passage 61 in contact with the pipe 16 is reduced, almost the same operation and effect as those of the ninth embodiment can be obtained.
＜第１１実施形態＞
　次に、第１１実施形態について図面を参照して詳細に説明する。 <11th Embodiment>
Next, the eleventh embodiment will be described in detail with reference to the drawings.
[加熱部の構成について]
　この実施形態では、配管１６における加熱部５０の構成の点で前記第９及び第１０の実施形態と異なる。すなわち、図１８に、ＥＧＲクーラ１３からＥＧＲガス分配器１５までの構成を図１５に準ずる構成図により示す。前記第９及び第１０の実施形態では、樹脂材により構成される配管１６（中流通路部ＭＳＰ）の長手方向に沿って温水が流れる温水通路６１を、配管１６を二重管構造に形成することで一体に形成した。これに対し、この実施形態では、温水通路６１は、配管１６の流路長手方向に沿って設けられる断面円形の金属パイプ６６により構成される。この実施形態では、金属パイプ６６は、樹脂製の配管１６にインサート成形により固定される。図１８に示すように、金属パイプ６６は、温水通路６１の入口６１ａの近傍が直角に曲げられ、この曲げられた状態で金属パイプ６６が配管１６にインサート成形される。図１９に、配管１６を図１８のＤ－Ｄ線断面図により示す。図１９に示すように、この実施形態の配管１６は、上管部６２と下管部６３とを含み、両者６２，６３は、ほぼ同等の外径を有する。上管部６２と下管部６３には、それぞれ長手方向に沿ってフランジ６２ａ，６３ｂが形成される。そして、上管部６２のフランジ６２ａと、下管部６３のフランジ６３ｂとが溶着６４により接合されることで配管１６が構成される。この実施形態では、下管部６３のみに一つの金属パイプ６６がインサート成形されることで固定され、上管部６２には金属パイプは固定されていない。この実施形態では、金属パイプ６６は、その全体が下管部６３にて樹脂材で完全に覆われるようにインサート成形される。金属パイプ６６は、例えば、アルミ製パイプや鉄メッキ製パイプにより構成することができる。 [About the configuration of the heating part]
This embodiment is different from the ninth and tenth embodiments in the configuration of the heating unit 50 in the pipe 16. That is, FIG. 18 shows the configuration from the EGR cooler 13 to the EGR gas distributor 15 with a configuration diagram according to FIG. In the ninth and tenth embodiments, the hot water passage 61 through which hot water flows along the longitudinal direction of the pipe 16 (middle flow passage portion MSP) made of a resin material is formed in a double pipe structure. It was formed integrally. On the other hand, in this embodiment, the hot water passage 61 is composed of a metal pipe 66 having a circular cross section provided along the longitudinal direction of the flow path of the pipe 16. In this embodiment, the metal pipe 66 is fixed to the resin pipe 16 by insert molding. As shown in FIG. 18, in the metal pipe 66, the vicinity of the inlet 61a of the hot water passage 61 is bent at a right angle, and the metal pipe 66 is insert-molded into the pipe 16 in this bent state. FIG. 19 shows the pipe 16 with a cross-sectional view taken along the line DD of FIG. As shown in FIG. 19, the pipe 16 of this embodiment includes an upper pipe portion 62 and a lower pipe portion 63, and both 62 and 63 have substantially the same outer diameter. Flange 62a and 63b are formed in the upper pipe portion 62 and the lower pipe portion 63, respectively, along the longitudinal direction. Then, the flange 62a of the upper pipe portion 62 and the flange 63b of the lower pipe portion 63 are joined by welding 64 to form the pipe 16. In this embodiment, one metal pipe 66 is fixed by insert molding only to the lower pipe portion 63, and the metal pipe is not fixed to the upper pipe portion 62. In this embodiment, the metal pipe 66 is insert-molded so that the entire metal pipe 66 is completely covered with the resin material by the lower pipe portion 63. The metal pipe 66 can be made of, for example, an aluminum pipe or an iron-plated pipe.
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１によれば、配管１６に加熱部５０としての温水通路６１が設けられるので、前記第９及び第１０の実施形態とほぼ同等の作用及び効果を得ることができる。 [About the action and effect of the EGR device]
According to the EGR device 11 of this embodiment, since the hot water passage 61 as the heating unit 50 is provided in the pipe 16, it is possible to obtain almost the same operation and effect as those of the ninth and tenth embodiments.
　この実施形態の構成によれば、温水通路６１が配管１６（中流通路部ＭＳＰ）の流路長手方向に沿って設けられる金属パイプ６６により構成されるので、温水通路６１が、外乱による亀裂に対し樹脂材より有利となる。このため、温水通路６１としての耐久性を高めることができる。 According to the configuration of this embodiment, since the hot water passage 61 is composed of the metal pipe 66 provided along the longitudinal direction of the flow path of the pipe 16 (middle flow passage portion MSP), the hot water passage 61 is cracked due to disturbance. On the other hand, it is more advantageous than the resin material. Therefore, the durability of the hot water passage 61 can be enhanced.
　この実施形態の構成によれば、金属パイプ６６が配管１６（中流通路部ＭＳＰ）に対しインサート成形により固定されるので、金属パイプ６６の配管１６に対する密着性が良くなり、金属パイプ６６との配管１６との接触面積が大きくなる。このため、温水通路６１のエンジン冷却水（温水）による、配管１６を流れるＥＧＲガスの加熱性及び保温性を高めることができる。また、金属パイプ６６が配管１６の内壁から露出しないことで、凝縮水による金属パイプ６６の腐食を防止することができる。 According to the configuration of this embodiment, since the metal pipe 66 is fixed to the pipe 16 (middle flow passage portion MSP) by insert molding, the adhesion of the metal pipe 66 to the pipe 16 is improved, and the metal pipe 66 is connected to the metal pipe 66. The contact area with the pipe 16 becomes large. Therefore, it is possible to improve the heatability and heat retention of the EGR gas flowing through the pipe 16 by the engine cooling water (hot water) of the hot water passage 61. Further, since the metal pipe 66 is not exposed from the inner wall of the pipe 16, it is possible to prevent the metal pipe 66 from being corroded by the condensed water.
　また、この実施形態の構成によれば、温水通路６１が金属パイプ６６で形成されるので、金属パイプ６６に外乱により亀裂が入ることがなく、温水通路６１を流れるエンジン冷却水が、配管１６の内側へ漏れ出るおそれがない。また、図１９に示すように、金属パイプ６６を配管１６の内壁から露出させないことで、金属パイプ６６が樹脂材で完全に覆われるので、配管１６の内側で発生した凝縮水が金属パイプ６６に接触することがない。更に、金属パイプ６６を、例えば、アルミ製パイプや鉄メッキ製パイプにより構成できるので、製造コストを抑えることができる。 Further, according to the configuration of this embodiment, since the hot water passage 61 is formed by the metal pipe 66, the metal pipe 66 is not cracked due to disturbance, and the engine cooling water flowing through the hot water passage 61 is the pipe 16. There is no risk of leaking inward. Further, as shown in FIG. 19, by not exposing the metal pipe 66 from the inner wall of the pipe 16, the metal pipe 66 is completely covered with the resin material, so that the condensed water generated inside the pipe 16 becomes the metal pipe 66. There is no contact. Further, since the metal pipe 66 can be made of, for example, an aluminum pipe or an iron-plated pipe, the manufacturing cost can be suppressed.
　この実施形態の構成によれば、金属パイプ６６の一部が折り曲げられて配管１６にインサート成形されるので、金属パイプ６６を配管１６に対し位置決めされる。このため、配管１６における金属パイプ６６の位置ずれを防止することができる。 According to the configuration of this embodiment, since a part of the metal pipe 66 is bent and insert-molded into the pipe 16, the metal pipe 66 is positioned with respect to the pipe 16. Therefore, it is possible to prevent the metal pipe 66 from being displaced in the pipe 16.
＜第１２実施形態＞
　次に、第１２実施形態について図面を参照して詳細に説明する。 <12th Embodiment>
Next, the twelfth embodiment will be described in detail with reference to the drawings.
[加熱部の構成について]
　この実施形態では、配管１６における加熱部５０の構成の点で前記第１１実施形態と異なる。すなわち、図２０に、配管１６を図１９に準ずる断面図により示す。図２０に示すように、この実施形態では、下管部６３のみに断面円形の二つの金属パイプ６６が平行に配置されてインサート成形されることで固定される。その他の構成については、第１１実施形態のそれと同じである。 [About the configuration of the heating part]
This embodiment is different from the eleventh embodiment in the configuration of the heating unit 50 in the pipe 16. That is, FIG. 20 shows the pipe 16 in a cross-sectional view according to FIG. As shown in FIG. 20, in this embodiment, two metal pipes 66 having a circular cross section are arranged in parallel only on the lower pipe portion 63 and fixed by insert molding. Other configurations are the same as those of the eleventh embodiment.
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１によれば、前記第１１実施形態の作用及び効果に加え、次のような作用及び効果を得ることができる。すなわち、この実施形態では、下管部６３のみに断面円形の二つの金属パイプ６６が平行に配置されてインサート成形されることで固定され、これにより温水通路６１が構成される。従って、配管１６に接する温水通路６１の面積が増える。このため、温水通路６１のエンジン冷却水（温水）による、配管１６を流れるＥＧＲガスの加熱性及び保温性を更に高めることができる。 [About the action and effect of the EGR device]
According to the EGR device 11 of this embodiment, the following actions and effects can be obtained in addition to the actions and effects of the eleventh embodiment. That is, in this embodiment, two metal pipes 66 having a circular cross section are arranged in parallel only on the lower pipe portion 63 and fixed by insert molding, thereby forming a hot water passage 61. Therefore, the area of the hot water passage 61 in contact with the pipe 16 increases. Therefore, the heatability and heat retention of the EGR gas flowing through the pipe 16 by the engine cooling water (hot water) of the hot water passage 61 can be further improved.
＜第１３実施形態＞
　次に、第１３実施形態について図面を参照して詳細に説明する。 <13th Embodiment>
Next, the thirteenth embodiment will be described in detail with reference to the drawings.
[加熱部の構成について]
　この実施形態では、配管１６における加熱部５０の構成の点で前記第１１及び第１２の実施形態と異なる。すなわち、図２１に、配管１６を図１９に準ずる断面図により示す。図２１に示すように、この実施形態では、下管部６３のみに断面楕円形の一つの金属パイプ６７が配置されてインサート成形されることで固定される。図２１に示す断面において、金属パイプ６７の長径は、金属パイプ６６の外径の約二倍に設定され、配管１６の水平方向と平行に配置される。また、金属パイプ６７の短径は、金属パイプ６６の外径とほぼ同じに設定され、配管１６の垂直方向と平行に配置される。その他の構成については、第１１及び第１２の実施形態のそれと同じである。 [About the configuration of the heating part]
This embodiment is different from the eleventh and twelfth embodiments in the configuration of the heating unit 50 in the pipe 16. That is, FIG. 21 shows the pipe 16 in a cross-sectional view according to FIG. As shown in FIG. 21, in this embodiment, one metal pipe 67 having an elliptical cross section is arranged only in the lower pipe portion 63 and fixed by insert molding. In the cross section shown in FIG. 21, the major axis of the metal pipe 67 is set to be about twice the outer diameter of the metal pipe 66, and is arranged parallel to the horizontal direction of the pipe 16. Further, the minor diameter of the metal pipe 67 is set to be substantially the same as the outer diameter of the metal pipe 66, and is arranged in parallel with the vertical direction of the pipe 16. Other configurations are the same as those of the eleventh and twelfth embodiments.
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１によれば、下管部６３のみに断面楕円形状の一つの金属パイプ６７がインサート成形されることで固定され、これにより温水通路６１が構成されるので、第１２実施形態とほぼ同等の作用及び効果を得ることができる。 [About the action and effect of the EGR device]
According to the EGR device 11 of this embodiment, one metal pipe 67 having an elliptical cross section is inserted and fixed only to the lower pipe portion 63, whereby the hot water passage 61 is formed. Therefore, the twelfth embodiment is performed. It is possible to obtain almost the same action and effect as the morphology.
＜第１４実施形態＞
　次に、第１４実施形態について図面を参照して詳細に説明する。 <14th Embodiment>
Next, the 14th embodiment will be described in detail with reference to the drawings.
[加熱部の構成について]
　この実施形態では、配管１６における加熱部５０の構成の点で前記第９実施形態と異なる。すなわち、図２２に、配管１６を図１９に準ずる断面図により示す。図２２に示すように、この実施形態では、下管部６３のみに断面円形の一つの金属パイプ６６がインサート成形されることで固定される。ここで、図２２において、金属パイプ６６の上側には、金属パイプ６６に接するように、断面波形をなす金属製の放熱板６８が設けられ、その放熱板６８が金属パイプ６６と一体に配管１６にインサート成形されることで固定される。図２２の断面図において、放熱板６８の横幅は、金属パイプ６６の外径の３倍以上の長さが望ましい。その他の構成については、第９実施形態のそれと同じである。 [About the configuration of the heating part]
This embodiment is different from the ninth embodiment in the configuration of the heating unit 50 in the pipe 16. That is, FIG. 22 shows the pipe 16 in a cross-sectional view according to FIG. As shown in FIG. 22, in this embodiment, one metal pipe 66 having a circular cross section is inserted and fixed only to the lower pipe portion 63. Here, in FIG. 22, a metal heat sink 68 having a cross-sectional waveform is provided on the upper side of the metal pipe 66 so as to be in contact with the metal pipe 66, and the heat sink 68 is integrally piped with the metal pipe 66. It is fixed by being insert-molded into. In the cross-sectional view of FIG. 22, the width of the heat sink 68 is preferably three times or more the outer diameter of the metal pipe 66. Other configurations are the same as those of the ninth embodiment.
[ＥＧＲ装置の作用及び効果について]
　従って、この実施形態のＥＧＲ装置１１によれば、配管１６の下管部６３に対し、一つの金属パイプ６６とそれに接する放熱板６８が、インサート成形されることで一体に固定される。このため、第９実施形態の作用及び効果に加え、金属パイプ６６から配管１６への放熱特性を放熱板６８により向上させることができる。 [About the action and effect of the EGR device]
Therefore, according to the EGR device 11 of this embodiment, one metal pipe 66 and the heat radiating plate 68 in contact with the metal pipe 66 are integrally fixed to the lower pipe portion 63 of the pipe 16 by insert molding. Therefore, in addition to the operation and effect of the ninth embodiment, the heat dissipation characteristic from the metal pipe 66 to the pipe 16 can be improved by the heat sink 68.
＜第１５実施形態＞
　次に、第１５実施形態について図面を参照して詳細に説明する。 <15th Embodiment>
Next, the fifteenth embodiment will be described in detail with reference to the drawings.
[加熱部の構成について]
　この実施形態では、配管１６における加熱部５０の構成の点で前記第９実施形態と異なる。すなわち、図２３に、配管１６を図１９に準ずる断面図により示す。図２３に示すように、この実施形態では、下管部６３のみに断面円形の一つの金属パイプ６６がインサート成形されることで固定される。ここで、図２３に示すように、金属パイプ６６の上側は、配管１６の内側、すなわちＥＧＲガスが流れる流路の中に露出して配置される。なお、この実施形態の金属パイプ６６は、錆止めのためにＳＵＳにより形成される。その他の構成については、第９実施形態のそれと同じである。 [About the configuration of the heating part]
This embodiment is different from the ninth embodiment in the configuration of the heating unit 50 in the pipe 16. That is, FIG. 23 shows the pipe 16 in a cross-sectional view according to FIG. As shown in FIG. 23, in this embodiment, one metal pipe 66 having a circular cross section is inserted and fixed only to the lower pipe portion 63. Here, as shown in FIG. 23, the upper side of the metal pipe 66 is exposed and arranged inside the pipe 16, that is, in the flow path through which the EGR gas flows. The metal pipe 66 of this embodiment is formed of SUS to prevent rust. Other configurations are the same as those of the ninth embodiment.
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１によれば、下管部６３のみに一つの金属パイプ６６がインサート成形されると共に、金属パイプ６６の上側が、配管１６の内側の流路の中に露出して配置される。このため、この実施形態では、第９実施形態の作用及び効果に加え、配管１６の内側を流れるＥＧＲガスに対し、温水通路６１の熱を直接的に伝えることができ、金属パイプ６６から配管１６への放熱特性を向上させることができる。 [About the action and effect of the EGR device]
According to the EGR device 11 of this embodiment, one metal pipe 66 is insert-molded only in the lower pipe portion 63, and the upper side of the metal pipe 66 is exposed and arranged in the inner flow path of the pipe 16. Will be done. Therefore, in this embodiment, in addition to the operation and effect of the ninth embodiment, the heat of the hot water passage 61 can be directly transferred to the EGR gas flowing inside the pipe 16, and the metal pipe 66 to the pipe 16 can be directly transferred. It is possible to improve the heat dissipation characteristics to.
＜第１６実施形態＞
　次に、第１６実施形態について図面を参照して詳細に説明する。 <16th Embodiment>
Next, the 16th embodiment will be described in detail with reference to the drawings.
[加熱部の構成について]
　この実施形態では、配管１６における加熱部５０の構成の点で前記第９～第１５の実施形態と異なる。すなわち、図２４には、金属パイプ６６が固定された配管１６の一部を側面図により示す。図２５には、金属パイプ６６が固定された配管１６を、図２４のＥ－Ｅ線断面図により示す。図２４、図２５に示すように、配管１６（中流通路部ＭＳＰ）の下管部６３には、その流路長手方向に沿って、一つの金属パイプ６６を保持するための複数のパイプホルダ７１が配管１６と一体に形成される。図２５に示すように、各パイプホルダ７１は、金属パイプ６６の外周を両脇から挟むように一対の爪部７１ａを一組として構成される。二つの爪部７１ａの間は下方へ向けて開き、それら爪部７１ａの間に金属パイプ６６が嵌め込まれる。金属パイプ６６は、このようにパイプホルダ７１に嵌め込まれることで、下管部６３に対しパイプホルダ７１により保持されことで固定される。この固定状態において、金属パイプ６６は、下管部６３の下側外壁に沿って接触している。このパイプホルダ７１は、この開示技術における保持手段の一例に相当する。 [About the configuration of the heating part]
This embodiment is different from the ninth to fifteenth embodiments in the configuration of the heating unit 50 in the pipe 16. That is, FIG. 24 shows a part of the pipe 16 to which the metal pipe 66 is fixed by a side view. FIG. 25 shows the pipe 16 to which the metal pipe 66 is fixed by the cross-sectional view taken along the line EE of FIG. 24. As shown in FIGS. 24 and 25, the lower pipe portion 63 of the pipe 16 (middle flow passage portion MSP) has a plurality of pipe holders for holding one metal pipe 66 along the longitudinal direction of the flow path. 71 is formed integrally with the pipe 16. As shown in FIG. 25, each pipe holder 71 is configured as a set of a pair of claw portions 71a so as to sandwich the outer periphery of the metal pipe 66 from both sides. The space between the two claws 71a opens downward, and the metal pipe 66 is fitted between the two claws 71a. By being fitted into the pipe holder 71 in this way, the metal pipe 66 is held by the pipe holder 71 with respect to the lower pipe portion 63 and is fixed. In this fixed state, the metal pipe 66 is in contact with the lower outer wall of the lower pipe portion 63. The pipe holder 71 corresponds to an example of a holding means in the disclosed technique.
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１によれば、金属パイプ６６の配管１６に対する接触面積の点では第１１実施形態のインサート成形より劣るものの、それ以外は第１１実施形態とほぼ同等の作用及び効果を得ることができる。 [About the action and effect of the EGR device]
According to the EGR device 11 of this embodiment, the contact area of the metal pipe 66 with respect to the pipe 16 is inferior to that of the insert molding of the eleventh embodiment, but other than that, almost the same operation and effect as those of the eleventh embodiment are obtained. be able to.
　また、この実施形態の構成によれば、金属パイプ６６が、配管１６（中流通路部ＭＳＰ）の流路長手方向に沿ってパイプホルダ７１（保持手段）により保持されることで固定されるので、樹脂製の配管１６と金属パイプ６６との間の熱膨張差による樹脂亀裂と製造コストの点で、インサート成形による固定よりも優位となる。このため、金属パイプ６６の延長と設計の自由度を向上させることができる。 Further, according to the configuration of this embodiment, the metal pipe 66 is fixed by being held by the pipe holder 71 (holding means) along the flow path longitudinal direction of the pipe 16 (middle flow passage portion MSP). In terms of resin cracks due to the difference in thermal expansion between the resin pipe 16 and the metal pipe 66 and manufacturing cost, it is superior to fixing by insert molding. Therefore, the extension of the metal pipe 66 and the degree of freedom in design can be improved.
＜第１７実施形態＞
　次に、第１７実施形態について図面を参照して詳細に説明する。 <17th Embodiment>
Next, the 17th embodiment will be described in detail with reference to the drawings.
[加熱部の構成について]
　この実施形態では、配管１６における加熱部５０の構成の点で前記第１６実施形態と異なる。すなわち、図２６には、金属パイプ６６が固定された配管１６の一部を側面図により示す。図２７には、金属パイプ６６が固定された配管１６を、図２６のＦ－Ｆ線断面図により示す。図２６、図２７に示すように、配管１６（中流通路部ＭＳＰ）の下管部６３には、その長手方向に沿って、一つの金属パイプ６６を保持するためのパイプホルダ７３が設けられる。図２７に示すように、パイプホルダ７３は、金属パイプ６６の下を受けるために下受け部７４と、金属パイプ６６の上側を受けるための上受け部７５と、下受け部７４を上受け部７５に固定するための複数のクリップ７６とから構成される。下受け部７４は、金属パイプ６６の下側を受けるために金属パイプ６６の長手方向に沿って延び、断面円弧状をなし、両側にフランジ７４ａを有する。上受け部７５は、金属パイプ６６の上側を受けるために下管部６３から下方へ突出すると共に金属パイプ６６の長手方向に沿って延び、断面円弧状の凹部７５ａを有し、両側にフランジ７５ｂが形成される。金属パイプ６６は、その上側半分が上受け部７５の凹部７５ａに嵌め入れられ、その下側半部が下受け部７４で覆われ、それらのフランジ７４ａ，７５ｂが複数のクリップ７６で挟持されることで配管１６に固定される。この固定状態において、金属パイプ６６は、下管部６３の下側外壁に沿って接触している。このパイプホルダ７３は、この開示技術における保持手段の一例に相当する。 [About the configuration of the heating part]
This embodiment is different from the 16th embodiment in the configuration of the heating unit 50 in the pipe 16. That is, FIG. 26 shows a part of the pipe 16 to which the metal pipe 66 is fixed by a side view. FIG. 27 shows a pipe 16 to which the metal pipe 66 is fixed by a sectional view taken along the line FF of FIG. 26. As shown in FIGS. 26 and 27, a pipe holder 73 for holding one metal pipe 66 is provided in the lower pipe portion 63 of the pipe 16 (middle flow passage portion MSP) along the longitudinal direction thereof. .. As shown in FIG. 27, the pipe holder 73 receives the lower receiving portion 74 for receiving the lower part of the metal pipe 66, the upper receiving portion 75 for receiving the upper side of the metal pipe 66, and the lower receiving portion 74. It is composed of a plurality of clips 76 for fixing to 75. The lower receiving portion 74 extends along the longitudinal direction of the metal pipe 66 to receive the lower side of the metal pipe 66, has an arcuate cross section, and has flanges 74a on both sides. The upper receiving portion 75 projects downward from the lower pipe portion 63 to receive the upper side of the metal pipe 66, extends along the longitudinal direction of the metal pipe 66, has a recess 75a having an arcuate cross section, and has flanges 75b on both sides. Is formed. The upper half of the metal pipe 66 is fitted into the recess 75a of the upper receiving portion 75, the lower half thereof is covered with the lower receiving portion 74, and the flanges 74a and 75b thereof are sandwiched by a plurality of clips 76. It is fixed to the pipe 16. In this fixed state, the metal pipe 66 is in contact with the lower outer wall of the lower pipe portion 63. The pipe holder 73 corresponds to an example of a holding means in the disclosed technique.
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１によれば、金属パイプ６６の配管１６に対する接触面積の点では第１１実施形態のインサート成形より劣るものの、それ以外は第１１実施形態とほぼ同等の作用及び効果を得ることができる。 [About the action and effect of the EGR device]
According to the EGR device 11 of this embodiment, the contact area of the metal pipe 66 with respect to the pipe 16 is inferior to that of the insert molding of the eleventh embodiment, but other than that, almost the same operation and effect as those of the eleventh embodiment are obtained. be able to.
＜第１８実施形態＞
　次に、第１８実施形態について図面を参照して詳細に説明する。 <18th Embodiment>
Next, the eighteenth embodiment will be described in detail with reference to the drawings.
[加熱部の構成について]
　この実施形態では、配管１６における加熱部５０の構成の点で前記第１６の実施形態と異なる。すなわち、図２８には、金属パイプ６６が固定された配管１６を、図２５に準ずる断面図により示す。図２８に示すように、この実施形態では、パイプホルダ７１（保持手段）により保持される金属パイプ６６と配管１６の下管部６３との間に、金属パイプ６６に沿って伸び、熱伝導性の良好な伝熱シート７７が設けられる。この伝熱シート７７は、柔軟なシート材（例えば、ゴムシート）により形成される。この実施形態は、この点で第１６実施形態と異なる。この伝熱シート７７は、この開示技術における伝熱部材の一例に相当する。 [About the configuration of the heating part]
This embodiment is different from the 16th embodiment in the configuration of the heating unit 50 in the pipe 16. That is, FIG. 28 shows the pipe 16 to which the metal pipe 66 is fixed by a cross-sectional view according to FIG. 25. As shown in FIG. 28, in this embodiment, the metal pipe 66 held by the pipe holder 71 (holding means) and the lower pipe portion 63 of the pipe 16 extend along the metal pipe 66 and have thermal conductivity. A good heat transfer sheet 77 is provided. The heat transfer sheet 77 is formed of a flexible sheet material (for example, a rubber sheet). This embodiment differs from the 16th embodiment in this respect. The heat transfer sheet 77 corresponds to an example of a heat transfer member in the disclosed technique.
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１によれば、第１６実施形態の作用及び効果に加え、次のような作用及び効果を得ることができる。すなわち、この実施形態では、パイプホルダ７１（保持手段）により保持される金属パイプ６６と配管１６の下管部６３（中流通路部ＭＳＰ）との間に伝熱シート７７が挟まれて設けられるので、金属パイプ６６と下管部６３との間に隙間がなくなり、両者６６，６３の間の密着性が向上する。このため、金属パイプ６６の中の温水通路６１を流れる温水による下管部６３の内壁への伝熱性を向上させることができ、その内壁の昇温性を向上させることができ、配管１６の内部を流れるＥＧＲガスの昇温性を向上させることができる。 [About the action and effect of the EGR device]
According to the EGR device 11 of this embodiment, the following actions and effects can be obtained in addition to the actions and effects of the 16th embodiment. That is, in this embodiment, the heat transfer sheet 77 is sandwiched between the metal pipe 66 held by the pipe holder 71 (holding means) and the lower pipe portion 63 (middle flow passage portion MSP) of the pipe 16. Therefore, there is no gap between the metal pipe 66 and the lower pipe portion 63, and the adhesion between the two 66 and 63 is improved. Therefore, the heat transfer property to the inner wall of the lower pipe portion 63 by the hot water flowing through the hot water passage 61 in the metal pipe 66 can be improved, the temperature rise property of the inner wall can be improved, and the inside of the pipe 16 can be improved. It is possible to improve the temperature rise property of the EGR gas flowing through the water.
　また、この実施形態の構成によれば、伝熱シート７７の柔軟性により金属パイプ６６と下管部６３との間に熱膨張差が生じても、金属パイプ６６及び下管部６３と伝熱シート７７との密着性は確保される。この意味で、温水通路６１を流れる温水による下管部６３の内壁への伝熱性を更に向上させることができ、その内壁の昇温性を更に向上させることができ、配管１６の内部を流れるＥＧＲガスの昇温性を更に向上させることができる。 Further, according to the configuration of this embodiment, even if a thermal expansion difference occurs between the metal pipe 66 and the lower pipe portion 63 due to the flexibility of the heat transfer sheet 77, heat transfer between the metal pipe 66 and the lower pipe portion 63 and the heat transfer portion 63. Adhesion with the sheet 77 is ensured. In this sense, the heat transfer property of the hot water flowing through the hot water passage 61 to the inner wall of the lower pipe portion 63 can be further improved, the temperature rise property of the inner wall can be further improved, and the EGR flowing inside the pipe 16 can be further improved. The temperature rise property of the gas can be further improved.
＜第１９実施形態＞
　次に、第１９実施形態について図面を参照して詳細に説明する。 <19th Embodiment>
Next, the 19th embodiment will be described in detail with reference to the drawings.
[加熱部の構成について]
　この実施形態では、配管１６における加熱部５０の構成の点で前記第１７の実施形態と異なる。すなわち、図２９には、金属パイプ６６が固定された配管１６を、図２７に準ずる断面図により示す。図２９に示すように、この実施形態では、パイプホルダ７３（保持手段）により保持される金属パイプ６６と配管１６の下管部６３（中流通路部ＭＳＰ）との間に、金属パイプ６６に沿って伸び、熱伝導性の良好なお伝熱シート７７が設けられる。この実施形態は、この点で第１７実施形態と異なる。この伝熱シート７７は、この開示技術における伝熱部材の一例に相当する。 [About the configuration of the heating part]
This embodiment is different from the 17th embodiment in the configuration of the heating unit 50 in the pipe 16. That is, FIG. 29 shows the pipe 16 to which the metal pipe 66 is fixed by a cross-sectional view according to FIG. 27. As shown in FIG. 29, in this embodiment, the metal pipe 66 is formed between the metal pipe 66 held by the pipe holder 73 (holding means) and the lower pipe portion 63 (middle flow passage portion MSP) of the pipe 16. A heat transfer sheet 77 that extends along the line and has good thermal conductivity is provided. This embodiment differs from the 17th embodiment in this respect. The heat transfer sheet 77 corresponds to an example of a heat transfer member in the disclosed technique.
[ＥＧＲ装置の作用及び効果について]
　従って、この実施形態のＥＧＲ装置１１によれば、第１７実施形態の作用及び効果に加え、次のような作用及び効果を得ることができる。すなわち、この実施形態では、パイプホルダ７３（保持手段）により保持される金属パイプ６６と下管部６３（中流通路部ＭＳＰ）との間に伝熱シート７７が挟まれて設けられるので、金属パイプ６６と下管部６３との間に隙間がなくなり、両者６６，６３の間の密着性が向上する。このため、金属パイプ６６の中の温水通路６１を流れる温水による下管部６３の内壁の昇温性を向上させることができ、配管１６の内部を流れるＥＧＲガスの昇温性を向上させることができる。 [About the action and effect of the EGR device]
Therefore, according to the EGR device 11 of this embodiment, the following actions and effects can be obtained in addition to the actions and effects of the 17th embodiment. That is, in this embodiment, the heat transfer sheet 77 is sandwiched between the metal pipe 66 held by the pipe holder 73 (holding means) and the lower pipe portion 63 (middle flow passage portion MSP), so that the metal is provided. There is no gap between the pipe 66 and the lower pipe portion 63, and the adhesion between the two 66 and 63 is improved. Therefore, it is possible to improve the temperature rise property of the inner wall of the lower pipe portion 63 by the hot water flowing through the hot water passage 61 in the metal pipe 66, and improve the temperature rise property of the EGR gas flowing inside the pipe 16. can.
＜第２０実施形態＞
　次に、第２０実施形態について図面を参照して詳細に説明する。 <20th Embodiment>
Next, the twentieth embodiment will be described in detail with reference to the drawings.
[加熱部の構成について]
　この実施形態では、配管１６における加熱部５０の構成の点で前記第１８実施形態と異なる。すなわち、図３０には、金属パイプ６６が固定された配管１６を、図２８に準ずる断面図により示す。図３０に示すように、この実施形態では、金属パイプ６６は、パイプホルダ７１（保持手段）により配管１６の下管部６３（中流通路部ＭＳＰ）に保持され、金属パイプ６６が伝熱シート７７を介して下管部６３に接するが、パイプホルダ７１の爪部７１ａと金属パイプ６６との間には隙間７８が設けられる。この隙間７８は、この開示技術における空気層（断熱層）の一例を構成する。この点で、この実施形態は第１８実施形態と異なる。 [About the configuration of the heating part]
This embodiment is different from the eighteenth embodiment in the configuration of the heating unit 50 in the pipe 16. That is, FIG. 30 shows the pipe 16 to which the metal pipe 66 is fixed by a cross-sectional view according to FIG. 28. As shown in FIG. 30, in this embodiment, the metal pipe 66 is held by the pipe holder 71 (holding means) in the lower pipe portion 63 (middle flow passage portion MSP) of the pipe 16, and the metal pipe 66 is a heat transfer sheet. Although it is in contact with the lower pipe portion 63 via 77, a gap 78 is provided between the claw portion 71a of the pipe holder 71 and the metal pipe 66. The gap 78 constitutes an example of an air layer (heat insulating layer) in the disclosed technique. In this respect, this embodiment is different from the eighteenth embodiment.
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１によれば、第１８実施形態の作用及び効果に加え、次のような作用及び効果を得ることができる。すなわち、この実施形態では、金属パイプ６６がパイプホルダ７１により保持された状態で、金属パイプ６６と下管部６３との間に伝熱シート７７が挟まれるが、爪部７１ａと金属パイプ６６との間に隙間７８が設けられる。従って、エンジン停止時には、金属パイプ６６から大気側への熱の逃げが隙間７８により抑制される。このため、エンジン停止時には、配管１６（中流通路部ＭＳＰ）の内壁の温度低下を抑制することができる。ここで、エンジン停止時には、金属パイプ６６の温水通路６１を温水が流れないが温水は滞留するので、その滞留した温水が熱源になる。そして、金属パイプ６６からの熱逃げが抑制されるので、配管１６の内壁の温度低下を有効に抑制することができる。エンジン運転時にも、隙間７８により金属パイプ６６から大気側への熱の逃げが抑制され、配管１６の内壁の温度低下を抑制することができる。 [About the action and effect of the EGR device]
According to the EGR device 11 of this embodiment, the following actions and effects can be obtained in addition to the actions and effects of the 18th embodiment. That is, in this embodiment, the heat transfer sheet 77 is sandwiched between the metal pipe 66 and the lower pipe portion 63 in a state where the metal pipe 66 is held by the pipe holder 71, but the claw portion 71a and the metal pipe 66 A gap 78 is provided between the two. Therefore, when the engine is stopped, the heat escape from the metal pipe 66 to the atmosphere side is suppressed by the gap 78. Therefore, when the engine is stopped, it is possible to suppress a decrease in temperature of the inner wall of the pipe 16 (middle flow passage portion MSP). Here, when the engine is stopped, hot water does not flow through the hot water passage 61 of the metal pipe 66, but the hot water stays, so that the staying hot water becomes a heat source. Since the heat escape from the metal pipe 66 is suppressed, the temperature drop of the inner wall of the pipe 16 can be effectively suppressed. Even during engine operation, the gap 78 suppresses the escape of heat from the metal pipe 66 to the atmosphere side, and the temperature drop of the inner wall of the pipe 16 can be suppressed.
＜第２１実施形態＞
　次に、第２１実施形態について図面を参照して詳細に説明する。 <21st Embodiment>
Next, the 21st embodiment will be described in detail with reference to the drawings.
[加熱部の構成について]
　この実施形態では、配管１６における加熱部５０の構成の点で前記第１９実施形態と異なる。すなわち、図３１には、金属パイプ６６が固定された配管１６を、図２９に準ずる断面図により示す。図３１に示すように、この実施形態では、金属パイプ６６は、パイプホルダ７３（保持手段）により配管１６の下管部６３（中流通路部ＭＳＰ）に保持され、金属パイプ６６が伝熱シート７７を介して下管部６３に接するが、主としてパイプホルダ７３の下受け部７４と金属パイプ６６との間には隙間７８（空気層（断熱層））が設けられる。この点で、この実施形態は第１９実施形態と異なる。 [About the configuration of the heating part]
This embodiment is different from the 19th embodiment in the configuration of the heating unit 50 in the pipe 16. That is, FIG. 31 shows the pipe 16 to which the metal pipe 66 is fixed by a cross-sectional view according to FIG. 29. As shown in FIG. 31, in this embodiment, the metal pipe 66 is held by the pipe holder 73 (holding means) in the lower pipe portion 63 (middle flow passage portion MSP) of the pipe 16, and the metal pipe 66 is a heat transfer sheet. Although it is in contact with the lower pipe portion 63 via 77, a gap 78 (air layer (heat insulating layer)) is mainly provided between the lower receiving portion 74 of the pipe holder 73 and the metal pipe 66. In this respect, this embodiment is different from the 19th embodiment.
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１によれば、第１９実施形態の作用及び効果に加え、次のような作用及び効果を得ることができる。すなわち、この実施形態では、金属パイプ６６がパイプホルダ７３（保持手段）により保持された状態で、金属パイプ６６と配管１６の下管部６３（中流通路部ＭＳＰ）との間に伝熱シート７７が挟まれるが、主として下受け部７４と金属パイプ６６との間に隙間７８が設けられる。従って、エンジン停止時には、金属パイプ６６から大気側への熱の逃げが隙間７８により抑制される。このため、エンジン停止時には、配管１６の内壁の温度低下を抑制することができる。ここで、エンジン停止時には、金属パイプ６６の温水通路６１を温水が流れないが温水は滞留するので、その滞留した温水が熱源になる。そして、金属パイプ６６からの熱逃げが抑制されるので、配管１６の内壁の温度低下を有効に抑制することができる。エンジン運転時にも、隙間７８により金属パイプ６６から大気側への熱の逃げが抑制され、配管１６の内壁の温度低下を抑制することができる。 [About the action and effect of the EGR device]
According to the EGR device 11 of this embodiment, the following actions and effects can be obtained in addition to the actions and effects of the 19th embodiment. That is, in this embodiment, the heat transfer sheet is held between the metal pipe 66 and the lower pipe portion 63 (middle flow passage portion MSP) of the pipe 16 in a state where the metal pipe 66 is held by the pipe holder 73 (holding means). 77 is sandwiched, but a gap 78 is mainly provided between the lower receiving portion 74 and the metal pipe 66. Therefore, when the engine is stopped, the heat escape from the metal pipe 66 to the atmosphere side is suppressed by the gap 78. Therefore, when the engine is stopped, the temperature drop of the inner wall of the pipe 16 can be suppressed. Here, when the engine is stopped, hot water does not flow through the hot water passage 61 of the metal pipe 66, but the hot water stays, so that the staying hot water becomes a heat source. Since the heat escape from the metal pipe 66 is suppressed, the temperature drop of the inner wall of the pipe 16 can be effectively suppressed. Even during engine operation, the gap 78 suppresses the escape of heat from the metal pipe 66 to the atmosphere side, and the temperature drop of the inner wall of the pipe 16 can be suppressed.
＜第２２実施形態＞
　次に、第２２実施形態について図面を参照して詳細に説明する。 <22nd Embodiment>
Next, the 22nd embodiment will be described in detail with reference to the drawings.
[加熱部の構成について]
　この実施形態では、配管１６における加熱部５０の構成の点で前記第１８実施形態と異なる。すなわち、図３２には、金属パイプ６６が固定された配管１６の一部を側面図により示す。図３３には、金属パイプ６６が固定された配管１６を、図３２のＧ－Ｇ線断面図により示す。図３２、図３３に示すように、この実施形態では、パイプホルダ７１（保持手段）により保持される金属パイプ６６と配管１６の下管部６３（中流通路部ＭＳＰ）との間に、熱伝導性の良好な伝熱プレート７９が設けられる。この点で、この実施形態は伝熱シート７７が設けられる第１８実施形態と異なる。この伝熱プレート７９は、この開示技術における伝熱部材の一例に相当する。 [About the configuration of the heating part]
This embodiment is different from the eighteenth embodiment in the configuration of the heating unit 50 in the pipe 16. That is, FIG. 32 shows a part of the pipe 16 to which the metal pipe 66 is fixed by a side view. FIG. 33 shows a pipe 16 to which the metal pipe 66 is fixed by a sectional view taken along the line GG of FIG. 32. As shown in FIGS. 32 and 33, in this embodiment, heat is generated between the metal pipe 66 held by the pipe holder 71 (holding means) and the lower pipe portion 63 (middle flow passage portion MSP) of the pipe 16. A heat transfer plate 79 having good conductivity is provided. In this respect, this embodiment is different from the 18th embodiment in which the heat transfer sheet 77 is provided. The heat transfer plate 79 corresponds to an example of a heat transfer member in the disclosed technique.
　図３２、図３３に示すように、伝熱プレート７９は、金属プレートであり、金属パイプ６６から下管部６３への伝熱範囲を拡大するために伝熱シート７７よりも広い面積を有する。伝熱プレート７９は、金属パイプ６６と下管部６３との間に挟まれ、金属パイプ６６に沿って伸びる主幹部７９ａと、隣り合うパイプホルダ７１の間にて主幹部７９ａから下管部６３の外壁に沿って伸びる翼部７９ｂとを含む。主幹部７９ａは、前述した伝熱シート７７と同等の機能を発揮するが、翼部７９ｂは、金属パイプ６６から伝熱プレート７９に伝わる熱を、下管部６３の外壁へ伝える機能を発揮する。 As shown in FIGS. 32 and 33, the heat transfer plate 79 is a metal plate and has a larger area than the heat transfer sheet 77 in order to expand the heat transfer range from the metal pipe 66 to the lower pipe portion 63. The heat transfer plate 79 is sandwiched between the metal pipe 66 and the lower pipe portion 63, and is sandwiched between the main trunk portion 79a extending along the metal pipe 66 and the adjacent pipe holder 71 between the main trunk portion 79a and the lower pipe portion 63. Includes a wing 79b extending along the outer wall of the. The main trunk portion 79a exerts the same function as the above-mentioned heat transfer sheet 77, but the wing portion 79b exerts a function of transferring the heat transferred from the metal pipe 66 to the heat transfer plate 79 to the outer wall of the lower pipe portion 63. ..
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１によれば、第１８実施形態の作用及び効果に加え、次のような作用及び効果を得ることができる。すなわち、この実施形態では、金属パイプ６６から伝熱プレート７９に伝わる熱が、翼部７９ｂを介して下管部６３の外壁へ更に伝わる。このため、下管部６３の外壁に熱が伝わる分だけ下管部６３の昇温性を更に向上させることができ、配管１６の内部を流れるＥＧＲガスの昇温性を更に向上させることができる。 [About the action and effect of the EGR device]
According to the EGR device 11 of this embodiment, the following actions and effects can be obtained in addition to the actions and effects of the 18th embodiment. That is, in this embodiment, the heat transferred from the metal pipe 66 to the heat transfer plate 79 is further transferred to the outer wall of the lower pipe portion 63 via the blade portion 79b. Therefore, the temperature riser of the lower pipe portion 63 can be further improved by the amount of heat transferred to the outer wall of the lower pipe portion 63, and the temperature riser of the EGR gas flowing inside the pipe 16 can be further improved. ..
＜第２３実施形態＞
　次に、第２３実施形態について図面を参照して詳細に説明する。 <23rd Embodiment>
Next, the 23rd embodiment will be described in detail with reference to the drawings.
[加熱部の構成について]
　この実施形態では、配管１６における加熱部５０の構成の点で前記第１９実施形態と異なる。すなわち、図３４には、金属パイプ６６が固定された配管１６の一部を側面図により示す。図３５には、金属パイプ６６が固定された配管１６を、図３４のＨ－Ｈ線断面図により示す。図３４、図３５に示すように、この実施形態では、パイプホルダ７３（保持手段）により保持される金属パイプ６６と配管１６の下管部６３（中流通路部ＭＳＰ）との間に、熱伝導性の良好なお伝熱プレート７９が設けられる。この実施形態は、この点で伝熱シート７７が設けられる第１９実施形態と異なる。この伝熱プレート７９は、この開示技術における伝熱部材の一例に相当する。 [About the configuration of the heating part]
This embodiment is different from the 19th embodiment in the configuration of the heating unit 50 in the pipe 16. That is, FIG. 34 shows a part of the pipe 16 to which the metal pipe 66 is fixed by a side view. FIG. 35 shows the pipe 16 to which the metal pipe 66 is fixed by the cross-sectional view taken along the line HH of FIG. 34. As shown in FIGS. 34 and 35, in this embodiment, heat is generated between the metal pipe 66 held by the pipe holder 73 (holding means) and the lower pipe portion 63 (middle flow passage portion MSP) of the pipe 16. A heat transfer plate 79 having good conductivity is provided. This embodiment differs from the 19th embodiment in which the heat transfer sheet 77 is provided in this respect. The heat transfer plate 79 corresponds to an example of a heat transfer member in the disclosed technique.
　図３４、図３５に示すように、伝熱プレート７９は、金属パイプ６６と下管部６３との間に挟まれ、金属パイプ６６に沿って伸びる主幹部７９ａと、隣りあうパイプホルダ７３の間にて主幹部７９ａから下管部６３の外壁に沿って伸びる翼部７９ｂとを含む。主幹部７９ａは、前述した伝熱シート７７と同等の機能を発揮するが、翼部７９ｂは、金属パイプ６６から伝熱プレート７９に伝わる熱を、下管部６３の外壁へ伝える機能を発揮する。 As shown in FIGS. 34 and 35, the heat transfer plate 79 is sandwiched between the metal pipe 66 and the lower pipe portion 63, and is between the main trunk portion 79a extending along the metal pipe 66 and the adjacent pipe holder 73. Includes a wing portion 79b extending from the main trunk portion 79a along the outer wall of the lower pipe portion 63. The main trunk portion 79a exerts the same function as the above-mentioned heat transfer sheet 77, but the wing portion 79b exerts a function of transferring the heat transferred from the metal pipe 66 to the heat transfer plate 79 to the outer wall of the lower pipe portion 63. ..
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１によれば、第１９実施形態の作用及び効果に加え、次のような作用及び効果を得ることができる。すなわち、この実施形態では、金属パイプ６６から伝熱プレート７９に伝わる熱が、翼部７９ｂを介して下管部６３の外壁へ更に伝わる。このため、下管部６３の外壁に熱が伝わる分だけ下管部６３の昇温性を更に向上させることができ、配管１６の内部を流れるＥＧＲガスの昇温性を更に向上させることができる。 [About the action and effect of the EGR device]
According to the EGR device 11 of this embodiment, the following actions and effects can be obtained in addition to the actions and effects of the 19th embodiment. That is, in this embodiment, the heat transferred from the metal pipe 66 to the heat transfer plate 79 is further transferred to the outer wall of the lower pipe portion 63 via the blade portion 79b. Therefore, the temperature riser of the lower pipe portion 63 can be further improved by the amount of heat transferred to the outer wall of the lower pipe portion 63, and the temperature riser of the EGR gas flowing inside the pipe 16 can be further improved. ..
＜第２４実施形態＞
　次に、第２４実施形態について図面を参照して詳細に説明する。 <24th Embodiment>
Next, the 24th embodiment will be described in detail with reference to the drawings.
[加熱部の構成について]
　この実施形態では、配管１６における加熱部５０の構成の点で前記第９～第２３の実施形態と異なる。すなわち、図３６には、ＥＧＲクーラ１３からＥＧＲガス分配器１５までの構成を図１５に準ずる構成図により示す。前記第９～第２３の実施形態では、温水通路６１が配管１６の流路長手方向に沿って設けられた。これに対し、この実施形態では、弁出口フランジ２１ｉと管入口フランジ１６ｅとの間に、入口側加熱スペーサ８１が挟まって設けられる。また、管出口フランジ１６ｆと分配器入口フランジ１５ｅとの間に、出口側加熱スペーサ８２が挟まって設けられる。この実施形態では、それら各加熱スペーサ８１，８２の周方向に沿って温水通路６１が設けられる。入口側加熱スペーサ８１の温水通路６１と出口側加熱スペーサ８２の温水通路６１には、エンジン１を冷却して温められた冷却水（温水）が流れるようになっている。入口側加熱スペーサ８１の温水通路６１と出口側加熱スペーサ８２の温水通路６１は、温水パイプ８３により接続され、入口側の温水通路６１を流れた温水が、温水パイプ８３を介して出口側の温水通路６１へ流れるようになっている。この実施形態で、各加熱スペーサ８１，８２は、それぞれ樹脂材により形成される。 [About the configuration of the heating part]
This embodiment is different from the ninth to 23rd embodiments in the configuration of the heating unit 50 in the pipe 16. That is, FIG. 36 shows the configuration from the EGR cooler 13 to the EGR gas distributor 15 by a configuration diagram according to FIG. In the ninth to 23rd embodiments, the hot water passage 61 is provided along the flow path longitudinal direction of the pipe 16. On the other hand, in this embodiment, the inlet side heating spacer 81 is provided sandwiched between the valve outlet flange 21i and the pipe inlet flange 16e. Further, an outlet side heating spacer 82 is provided so as to be sandwiched between the pipe outlet flange 16f and the distributor inlet flange 15e. In this embodiment, a hot water passage 61 is provided along the circumferential direction of each of the heating spacers 81 and 82. Cooling water (hot water) that has cooled the engine 1 flows through the hot water passage 61 of the inlet side heating spacer 81 and the hot water passage 61 of the outlet side heating spacer 82. The hot water passage 61 of the inlet side heating spacer 81 and the hot water passage 61 of the outlet side heating spacer 82 are connected by a hot water pipe 83, and the hot water flowing through the hot water passage 61 on the inlet side passes through the hot water pipe 83 to the hot water on the outlet side. It is designed to flow to the passage 61. In this embodiment, the heating spacers 81 and 82 are each made of a resin material.
[ＥＧＲ装置の作用及び効果について]
　この実施形態のＥＧＲ装置１１の構成によれば、前記第９～第２３の実施形態と異なり次のような作用及び効果を得ることができる。すなわち、この実施形態では、弁出口フランジ２１ｉと管入口フランジ１６ｅとの間に挟まれて設けられる入口側加熱スペーサ８１及び管出口フランジ１６ｆと分配器入口フランジ１５ｅ（通路部入口フランジ）との間に挟まって設けられる出口側加熱スペーサ８２の周方向に沿って温水通路６１が設けられる。従って、弁出口フランジ２１ｉと管入口フランジ１６ｅを流れるＥＧＲガス及び管出口フランジ１６ｆと分配器入口フランジ１５ｅを流れるＥＧＲガスが、各加熱スペーサ８１，８２の温水通路６１の温水の熱により加熱される。加えて、各加熱スペーサ８１，８２の温水通路６１を流れる温水の熱が、各加熱スペーサ８１，８２を介して前後のフランジ２１ｉ，１６ｅ，１６ｆ，１５ｅを介してケーシング２１の流路部２１ｆ（ＥＧＲ弁１４の出口側）、配管１６の入口１６ａ及び出口１６ｂ、並びにＥＧＲガス分配器１５の入口１５ｄへ伝わり、それらの内壁が加熱される。このため、各加熱スペーサ８１，８２に隣接する中流通路部ＭＳＰの各部位２１ｉ，１６ｅ，１６ｆ，１５ｅ，２１ｆ，１６ａ，１６ｂ，１５ｄを流れるＥＧＲガスを有効に保温することができる。 [About the action and effect of the EGR device]
According to the configuration of the EGR device 11 of this embodiment, the following actions and effects can be obtained unlike the ninth to 23rd embodiments. That is, in this embodiment, between the inlet side heating spacer 81 and the pipe outlet flange 16f provided sandwiched between the valve outlet flange 21i and the pipe inlet flange 16e and the distributor inlet flange 15e (passage inlet flange). A hot water passage 61 is provided along the circumferential direction of the outlet-side heating spacer 82 provided so as to be sandwiched between the two. Therefore, the EGR gas flowing through the valve outlet flange 21i and the pipe inlet flange 16e and the EGR gas flowing through the pipe outlet flange 16f and the distributor inlet flange 15e are heated by the heat of the hot water in the hot water passage 61 of the heating spacers 81 and 82. .. In addition, the heat of the hot water flowing through the hot water passages 61 of the heating spacers 81 and 82 passes through the front and rear flanges 21i, 16e, 16f and 15e via the heating spacers 81 and 82, and the flow path portion 21f of the casing 21 ( EGR valve 14 outlet side), the inlet 16a and outlet 16b of the pipe 16, and the inlet 15d of the EGR gas distributor 15, and their inner walls are heated. Therefore, the EGR gas flowing through each portion 21i, 16e, 16f, 15e, 21f, 16a, 16b, 15d of the middle flow passage portion MSP adjacent to each heating spacer 81, 82 can be effectively kept warm.
　ここで、この実施形態のように弁出口フランジ２１ｉと管入口フランジ１６ｅとの間に、温水通路６１を有する入口側加熱スペーサ８１を設けたことを想定した各種温度の測定結果について説明する。図３７は、この実施形態に係り、測定対象である、金属製の上流側配管８５及びその出口フランジ８５ａと、樹脂製の下流側配管８６及びその入口フランジ８６ａとの接続部分を断面図により示す。上流側配管８５及びその出口フランジ８５ａは、金属製の流路部２１ｆ及び弁出口フランジ２１ｉを想定した。樹脂製の下流側配管８６及びその入口フランジ８６ａは、樹脂製の入口側加熱スペーサ８１、管入口フランジ１６ｅ及び配管１６を想定した。入口フランジ８６ａには、温水通路６１が形成される。図３８は、対比例に係り、測定対象である、金属製の上流側配管８５及びその出口フランジ８５ａと、金属製の下流側配管８７及びその入口フランジ８７ａとの接続部分を断面図により示す。金属製の下流側配管８７及びその入口フランジ８７ａは、入口側加熱スペーサ８１、管入口フランジ１６ｅ及び配管１６を金属製にしたことを想定した。入口フランジ８７ａには、温水通路６１が形成される。ここで、図３７及び図３８の温水通路６１には、例えば「６０℃」の温水が流れ、その周囲の外気温度は、例えば「２５℃」である。図３９には、（Ａ）エンジン回転数（ＥＧＲ流量）の変化と、（Ｂ）各種温度の変化をタイムチャートにより示す。 Here, various temperature measurement results assuming that an inlet side heating spacer 81 having a hot water passage 61 is provided between the valve outlet flange 21i and the pipe inlet flange 16e as in this embodiment will be described. FIG. 37 is a cross-sectional view showing a connection portion between the metal upstream pipe 85 and its outlet flange 85a and the resin downstream pipe 86 and its inlet flange 86a, which are the objects of measurement according to this embodiment. .. For the upstream pipe 85 and its outlet flange 85a, a metal flow path portion 21f and a valve outlet flange 21i are assumed. As the resin downstream pipe 86 and its inlet flange 86a, a resin inlet side heating spacer 81, a pipe inlet flange 16e, and a pipe 16 are assumed. A hot water passage 61 is formed in the inlet flange 86a. FIG. 38 is a cross-sectional view showing a connection portion between the metal upstream pipe 85 and its outlet flange 85a and the metal downstream pipe 87 and its inlet flange 87a, which are in inverse proportion to each other and are measurement targets. As for the metal downstream side pipe 87 and its inlet flange 87a, it is assumed that the inlet side heating spacer 81, the pipe inlet flange 16e, and the pipe 16 are made of metal. A hot water passage 61 is formed in the inlet flange 87a. Here, for example, hot water of "60 ° C." flows through the hot water passage 61 of FIGS. 37 and 38, and the temperature of the outside air around the hot water passage 61 is, for example, "25 ° C.". FIG. 39 shows (A) changes in engine speed (EGR flow rate) and (B) changes in various temperatures by time charts.
　図３９（Ｂ）において、太い実線は樹脂製の入口フランジ８６ａの温水通路６１を流れる温水の温度（第１の温水温度）ＴＷ１を示し、実線は金属製の入口フランジ８７ａの温水通路６１を流れる温水の温度（第２の温水温度）ＴＷ２を示し、太い破線は樹脂製の入口フランジ８６ａの内壁の温度（第１の内壁温度）ＴＩ１を示し、破線は金属製の入口フランジ８７ａの内壁の温度（第２の内壁温度）ＴＩ２を示し、太い１点鎖線は樹脂製の入口フランジ８６ａの内部を流れるＥＧＲガスの温度（第１のＥＧＲガス温度）ＴＧ１を示し、１点鎖線は金属製の入口フランジ８７ａの内部を流れるＥＧＲガスの温度（第２のＥＧＲガス温度）ＴＧ２を示し、別の破線は冷却水温度ＴＨＷを示す。 In FIG. 39B, the thick solid line shows the temperature of hot water (first hot water temperature) TW1 flowing through the hot water passage 61 of the resin inlet flange 86a, and the solid line shows the hot water passage 61 flowing through the hot water passage 61 of the metal inlet flange 87a. The temperature of hot water (second hot water temperature) TW2 is shown, the thick broken line shows the temperature of the inner wall of the resin inlet flange 86a (first inner wall temperature) TI1, and the broken line shows the temperature of the inner wall of the metal inlet flange 87a. (Second inner wall temperature) TI2 is shown, the thick one-point chain wire indicates the temperature of EGR gas flowing inside the resin inlet flange 86a (first EGR gas temperature) TG1, and the one-point chain wire is the metal inlet. The temperature of the EGR gas flowing inside the flange 87a (second EGR gas temperature) TG2 is shown, and another broken line shows the cooling water temperature THW.
　図３９に示すように、エンジン１の運転と停止を交互に繰り返した場合、エンジン回転数（ＥＧＲ流量）が高くなるエンジン運転時には、各種温度ＴＷ１，ＴＷ２，ＴＩ１，ＴＩ２，ＴＧ１，ＴＧ２，ＴＨＷはそれぞれ上昇し、エンジン回転数（ＥＧＲ流量）がゼロになるエンジン停止時には、各種温度ＴＷ１，ＴＷ２，ＴＩ１，ＴＩ２，ＴＧ１，ＴＧ２，ＴＨＷは低下する。 As shown in FIG. 39, when the engine 1 is alternately started and stopped, the various temperatures TW1, TW2, TI1, TI2, TG1, TG2, THW are set during engine operation in which the engine speed (EGR flow rate) becomes high. When the engine is stopped and the engine speed (EGR flow rate) becomes zero, the various temperatures TW1, TW2, TI1, TI2, TG1, TG2, THW decrease.
　ここで、エンジン停止後において、樹脂製の入口フランジ８６ａは、熱伝導性が低く、外気による冷却が抑制されるので、温水通路６１から外気への熱の逃げが比較的小さくなる。このため、第１の内壁温度ＴＩ１の降下は比較的小さくなる。これに対し、エンジン停止後において、金属製の入口フランジ８７ａは、熱伝導性が高く、外気により冷やされ易いので、温水通路６１から外気への熱の逃げが比較的大きくなる。このため、第２の内壁温度ＴＩ２の降下は比較的大きくなる。このように、入口フランジ８６ａを樹脂製にすることで、エンジン運転時（ＥＧＲ実行時）には、その内壁の温度上昇を改善することができ、エンジン停止時（ＥＧＲ停止時）には、その内壁の温度降下を抑制することができる。また、樹脂製の入口フランジ８６ａの温水通路６１によりＥＧＲガスを加熱することで、下流側配管８６の内壁と、そこを流れるＥＧＲガスの温度低下が抑えられる。加えて、下流側配管８６の加熱が上流側配管８５へ伝わることもない。 Here, after the engine is stopped, the resin inlet flange 86a has low thermal conductivity and cooling by the outside air is suppressed, so that the heat escape from the hot water passage 61 to the outside air becomes relatively small. Therefore, the drop in the first inner wall temperature TI1 is relatively small. On the other hand, after the engine is stopped, the metal inlet flange 87a has high thermal conductivity and is easily cooled by the outside air, so that the heat escapes from the hot water passage 61 to the outside air becomes relatively large. Therefore, the drop in the second inner wall temperature TI2 becomes relatively large. In this way, by making the inlet flange 86a made of resin, the temperature rise of the inner wall thereof can be improved when the engine is running (when EGR is executed), and when the engine is stopped (when EGR is stopped), the temperature rise can be improved. It is possible to suppress the temperature drop of the inner wall. Further, by heating the EGR gas by the hot water passage 61 of the resin inlet flange 86a, the temperature drop of the inner wall of the downstream pipe 86 and the EGR gas flowing therethrough can be suppressed. In addition, the heating of the downstream side pipe 86 is not transmitted to the upstream side pipe 85.
[別の実施形態について]
　なお、この開示技術は前記各実施形態に限定されるものではなく、開示技術の趣旨を逸脱することのない範囲で構成の一部を適宜変更して実施することもできる。 [About another embodiment]
The disclosed technique is not limited to each of the above-described embodiments, and a part of the configuration may be appropriately modified and implemented without departing from the spirit of the disclosed technique.
　（１）前記各実施形態では、中流通路部ＭＳＰのほぼ全部に保温手段を設けたが、中流通路部の最下流部のみに保温手段を設けることもできる。 (1) In each of the above-described embodiments, the heat insulating means is provided in almost all of the middle flow passage portion MSP, but it is also possible to provide the heat insulating means only in the most downstream portion of the middle flow passage portion.
　（２）前記各実施形態では、ＥＧＲ通路１２の下流通路部ＤＳＰをＥＧＲガス分配器１５により構成したが、下流通路部をＥＧＲガス分配器ではなくＥＧＲ通路の配管により構成することもできる。 (2) In each of the above embodiments, the downstream passage portion DSP of the EGR passage 12 is configured by the EGR gas distributor 15, but the downstream passage portion can also be configured by the piping of the EGR passage instead of the EGR gas distributor.
　（３）前記第５実施形態では、発熱被膜５１を配管１６の内壁に設けたが、発熱被膜を配管の外壁に設けることもできる。また、加熱部５０を発熱被膜５１により構成したが、加熱部を電熱線により構成することもできる。 (3) In the fifth embodiment, the heat generating film 51 is provided on the inner wall of the pipe 16, but the heat generating film can also be provided on the outer wall of the pipe. Further, although the heating unit 50 is composed of the heating film 51, the heating unit can also be composed of a heating wire.
　（４）前記第３実施形態では、図９に示すように、ＥＧＲクーラ１３のケーシング２１に、バイパス通路２１ｇとバイパス弁２４を設けたが、図４０に示すように、ＥＧＲクーラ１３のケーシング２１から、バイパス通路２１ｇとバイパス弁２４を省略することもできる。この場合、図４０に示すように、ケーシング２１の流路部２１ｆを図９に示すよりも短くすることもできる。この場合、バイパス通路２１ｇとバイパス弁２４によるＥＧＲガスの迂回機能はないものの、それ以外は第３実施形態と同等の作用及び効果を得ることができる。すなわち、中流通路部ＭＳＰが熱交換器２３の出口２３ｄより下流に位置し、中流通路部ＭＳＰにＥＧＲ弁１４及び配管１６が設けられるので、ＥＧＲ弁１４及配管１６を流れるＥＧＲガスが保温手段により保温された状態でＥＧＲガス分配器１５（下流通路部ＤＳＰ）へ流れる。このため、熱交換器１５によりＥＧＲガスの温度を低下させることができ、樹脂材より形成されるＥＧＲ弁１４の流路３４及び配管１６（中流通路部ＭＳＰ）の、ＥＧＲガスによる溶損を抑制することができる。また、ＥＧＲ弁１４の流路３４及び配管１６（中流通路部ＭＳＰ）での樹脂材へのＥＧＲガスの熱の伝わりを低減することができ、ＥＧＲ通路１２のＥＧＲガス分配器１５（下流通路部ＤＳＰ）へ流れるＥＧＲガスの温度低下を抑制することができ、そのＥＧＲガス分配器１５における凝縮水の発生を抑制することができる。図４０には、ＥＧＲクーラ１３からＥＧＲガス分配器１５までの構成を図９に準ずる構成図により示す。 (4) In the third embodiment, as shown in FIG. 9, the casing 21 of the EGR cooler 13 is provided with the bypass passage 21g and the bypass valve 24. However, as shown in FIG. 40, the casing 21 of the EGR cooler 13 is provided. Therefore, the bypass passage 21g and the bypass valve 24 can be omitted. In this case, as shown in FIG. 40, the flow path portion 21f of the casing 21 can be made shorter than that shown in FIG. In this case, although the bypass passage 21g and the bypass valve 24 do not have the detour function of the EGR gas, other than that, the same operation and effect as those of the third embodiment can be obtained. That is, since the middle flow passage portion MSP is located downstream from the outlet 23d of the heat exchanger 23 and the EGR valve 14 and the pipe 16 are provided in the middle flow passage portion MSP, the EGR gas flowing through the EGR valve 14 and the pipe 16 is kept warm. It flows to the EGR gas distributor 15 (downstream passage portion DSP) while being kept warm by the means. Therefore, the temperature of the EGR gas can be lowered by the heat exchanger 15, and the flow path 34 and the pipe 16 (middle flow passage portion MSP) of the EGR valve 14 formed of the resin material are not melted by the EGR gas. It can be suppressed. Further, it is possible to reduce the heat transfer of the EGR gas to the resin material in the flow path 34 and the pipe 16 (middle flow passage portion MSP) of the EGR valve 14, and the EGR gas distributor 15 (downstream passage) of the EGR passage 12 can be reduced. The temperature drop of the EGR gas flowing to the part DSP) can be suppressed, and the generation of condensed water in the EGR gas distributor 15 can be suppressed. FIG. 40 shows the configuration from the EGR cooler 13 to the EGR gas distributor 15 by a configuration diagram according to FIG.
　（５）上記（４）の別の実施形態では、図４０に示すように、バイパス通路２１ｇとバイパス弁２４を省略したケーシング２１に設けられる組付部２１ｈを、熱交換器２３の軸線方向に沿って配置し、その組付部２１ｈの孔にＥＧＲ弁１４のハウジング４６を組み入れる（ドロップイン）ことで、ＥＧＲ弁１４をＥＧＲクーラ１３に取り付けた。これに対し、図４１に示すように、バイパス通路２１ｇとバイパス弁２４を省略したケーシング２１に設けられる組付部２１ｈを、熱交換器２３の軸線と直交する方向に沿って配置し、その組付部２１ｈの孔にＥＧＲ弁１４のハウジング４６を組み入れる（ドロップイン）ことで、ＥＧＲ弁１４をＥＧＲクーラ１３に取り付けることもできる。この場合、ＥＧＲ弁１４が取り付けられたＥＧＲクーラ１３の全高を短くすることができ、全体をコンパクトにすることができる。図４１には、ＥＧＲクーラ１３からＥＧＲガス分配器１５までの構成を構成図により示す。 (5) In another embodiment of (4) above, as shown in FIG. 40, the assembly portion 21h provided in the casing 21 in which the bypass passage 21g and the bypass valve 24 are omitted is provided in the axial direction of the heat exchanger 23. The EGR valve 14 was attached to the EGR cooler 13 by arranging along the line and incorporating (drop-in) the casing 46 of the EGR valve 14 into the hole of the assembly portion 21h. On the other hand, as shown in FIG. 41, the assembly portion 21h provided in the casing 21 excluding the bypass passage 21g and the bypass valve 24 is arranged along the direction orthogonal to the axis of the heat exchanger 23, and the assembly thereof. The EGR valve 14 can also be attached to the EGR cooler 13 by incorporating (drop-in) the casing 46 of the EGR valve 14 into the hole of the attachment portion 21h. In this case, the total height of the EGR cooler 13 to which the EGR valve 14 is attached can be shortened, and the whole can be made compact. FIG. 41 shows the configuration from the EGR cooler 13 to the EGR gas distributor 15 by a block diagram.
　（６）前記第１５実施形態では、図２３に示すように、金属パイプ６６の上側を、配管１６の内側、すなわちＥＧＲガスが流れる流路の中に露出して配置した。これに対し、図４２に、配管１６を図２３に準ずる断面図で示すように、配管１６の内側に露出した金属パイプ６６の上側に放熱板６８を配置し、放熱板６８を流路内に露出させてもよい。 (6) In the fifteenth embodiment, as shown in FIG. 23, the upper side of the metal pipe 66 is exposed and arranged inside the pipe 16, that is, in the flow path through which the EGR gas flows. On the other hand, in FIG. 42, as shown in the cross-sectional view of the pipe 16 according to FIG. 23, the heat sink 68 is arranged on the upper side of the metal pipe 66 exposed inside the pipe 16, and the heat sink 68 is placed in the flow path. It may be exposed.
　（７）前記第２３実施形態では、図３５に示すように、パイプホルダ７３（保持手段）により保持される金属パイプ６６と配管１６の下管部６３（中流通路部ＭＳＰ）との間に、熱伝導性の良好な伝熱プレート７９のみを設けた。これに対し、図４３に、配管１６を図３５に準ずる断面図に示すように、パイプホルダ７３（保持手段）により保持される金属パイプ６６と配管１６の下管部６３（中流通路部ＭＳＰ）との間に、熱伝導性の良好な伝熱プレート７９と伝熱シート７７を重ねて設けることもできる。併せて、パイプホルダ７３の下受け部７４と金属パイプ６６との間に、隙間７８（空気層（断熱層））を設けることもできる。ここで、伝熱プレート７９は金属より形成されるが、伝熱シート７７は柔軟なゴム等のシート材より形成されるので、伝熱プレート７９と下管部６３との間を伝熱シート７７を介して密着させることができ、金属パイプ６６から下管部６３への伝熱性を向上させることができる。また、下受け部７４と金属パイプ６６との間に隙間７８が設けられるので、金属パイプ６６から大気側への熱の逃げが隙間７８により抑制される。このため、配管１６の内壁の温度低下を抑制することができる (7) In the 23rd embodiment, as shown in FIG. 35, between the metal pipe 66 held by the pipe holder 73 (holding means) and the lower pipe portion 63 (middle flow passage portion MSP) of the pipe 16. , Only the heat transfer plate 79 having good thermal conductivity was provided. On the other hand, in FIG. 43, as shown in the cross-sectional view of the pipe 16 according to FIG. 35, the metal pipe 66 held by the pipe holder 73 (holding means) and the lower pipe portion 63 (middle flow passage portion MSP) of the pipe 16 ), A heat transfer plate 79 having good thermal conductivity and a heat transfer sheet 77 may be provided on top of each other. At the same time, a gap 78 (air layer (heat insulating layer)) may be provided between the lower receiving portion 74 of the pipe holder 73 and the metal pipe 66. Here, the heat transfer plate 79 is formed of metal, but since the heat transfer sheet 77 is formed of a sheet material such as flexible rubber, the heat transfer sheet 77 is sandwiched between the heat transfer plate 79 and the lower pipe portion 63. It can be brought into close contact with the metal pipe 66, and the heat transfer property from the metal pipe 66 to the lower pipe portion 63 can be improved. Further, since the gap 78 is provided between the lower receiving portion 74 and the metal pipe 66, the escape of heat from the metal pipe 66 to the atmosphere side is suppressed by the gap 78. Therefore, it is possible to suppress a decrease in temperature of the inner wall of the pipe 16.
　（８）前記第１実施形態では、弁部３２を構成する外ハウジング３８を金属製とし、内ハウジング３９を樹脂製としたが、外ハウジングと内ハウジングの両方を樹脂製とすることもできる。 (8) In the first embodiment, the outer housing 38 constituting the valve portion 32 is made of metal and the inner housing 39 is made of resin, but both the outer housing and the inner housing may be made of resin.
　（９）前記第５、第６、第８～第２４等の実施形態では、断熱コート４１を省略する代わりに、発熱被膜５１、空気層５６及び温水通路６１等を設けたが、断熱コートと共に発熱被膜、空気層及び温水通路等を設けることもできる。 (9) In the fifth, sixth, eighth to twenty-fourth embodiments, the heat insulating coating 51, the air layer 56, the hot water passage 61 and the like are provided instead of omitting the heat insulating coat 41, but together with the heat insulating coat. It is also possible to provide a heating film, an air layer, a hot water passage, and the like.
　（１０）前記第２２実施形態では、パイプホルダ７１（保持手段）により保持される金属パイプ６６と配管１６の下管部６３との間に、熱伝導性の良好な伝熱プレート７９のみを設けた。これに対し、上記（７）の別の実施形態と同様、パイプホルダ７１（保持手段）により保持される金属パイプ６６と配管１６の下管部６３との間に、熱伝導性の良好な伝熱プレート７９と伝熱シート７７を重ねて設けることもできる。 (10) In the 22nd embodiment, only the heat transfer plate 79 having good thermal conductivity is provided between the metal pipe 66 held by the pipe holder 71 (holding means) and the lower pipe portion 63 of the pipe 16. rice field. On the other hand, as in the other embodiment of (7) above, good thermal conductivity is transmitted between the metal pipe 66 held by the pipe holder 71 (holding means) and the lower pipe portion 63 of the pipe 16. The heat plate 79 and the heat transfer sheet 77 may be provided on top of each other.
　（１１）前記第１０～第２３の実施形態、上記（６）、（７）及び（１０）の別の実施形態では、配管１６を上管部６２と下管部６３とで構成し、下管部６３のみに加熱部を設けた。これに対し、配管の上管部のみに加熱部を設けることもできる。 (11) In the tenth to twenty-third embodiments, and in another embodiment of the above (6), (7) and (10), the pipe 16 is composed of an upper pipe portion 62 and a lower pipe portion 63, and the lower pipe portion 16 is formed. A heating portion was provided only in the pipe portion 63. On the other hand, it is also possible to provide a heating portion only on the upper pipe portion of the pipe.
　この開示技術は、ガソリンエンジンやディーゼルエンジンに設けられるＥＧＲ装置に適用することができる。 This disclosed technology can be applied to EGR devices installed in gasoline engines and diesel engines.
１　エンジン
２　吸気通路
３　排気通路
１１　ＥＧＲ装置
１２　ＥＧＲ通路
１３　ＥＧＲクーラ
１４　ＥＧＲ弁
１５　ＥＧＲガス分配器（ＥＧＲ通路の下流通路部を構成する）
１５ｅ　分配器入口フランジ（通路部入口フランジ）
１６　配管（ＥＧＲ通路の中流通路部を構成する）
１６ａ　入口
１６ｂ　出口
１６ｃ　外管
１６ｄ　内管
１６ｅ　管入口フランジ
１６ｆ　管出口フランジ
２１ｃ　出口
２１ｇ　バイパス通路
２１ｇａ　入口
２１ｇｂ　出口
２１ｉ　弁出口フランジ
２３　熱交換器
２３ａ　入口
２３ｂ　出口
２４　バイパス弁
３４　流路
３４ａ　入口
３４ｂ　出口
４１　断熱コート（保温手段）
５０　加熱部
５１　発熱被膜（加熱部）
５６　空気層（保温手段）
５８　冷却部
６１　温水通路（加熱部）
６６　金属パイプ
６７　金属パイプ
７１　パイプホルダ（保持手段）
７３　パイプホルダ（保持手段）
７７　伝熱シート（伝熱部材）
７８　隙間（空気層）
７９　伝熱プレート（伝熱部材）
８１　入口側加熱スペーサ
８２　出口側加熱スペーサ
ＵＳＰ　上流通路部
ＭＳＰ　中流通路部
ＤＳＰ　下流通路部 1 Engine 2 Intake passage 3 Exhaust passage 11 EGR device 12 EGR passage 13 EGR cooler 14 EGR valve 15 EGR gas distributor (constituting the downstream passage portion of the EGR passage)
15e Distributor inlet flange (passage inlet flange)
16 Piping (constituting the midstream passage of the EGR passage)
16a Inlet 16b Outlet 16c Outer pipe 16d Inner pipe 16e Pipe inlet flange 16f Pipe outlet flange 21c Outlet 21g Bypass passage 21ga Inlet 21gb Outlet 21i Valve outlet flange 23 Heat exchanger 23a Inlet 23b Outlet 24 Bypass valve 34 Flow path 34a Inlet 34b Outlet 41 Insulation coat (heat insulation means)
50 Heating part 51 Heat-generating film (heating part)
56 Air layer (heat insulating means)
58 Cooling section 61 Hot water passage (heating section)
66 Metal pipe 67 Metal pipe 71 Pipe holder (holding means)
73 Pipe holder (holding means)
77 Heat transfer sheet (heat transfer member)
78 Gap (air layer)
79 Heat transfer plate (heat transfer member)
81 Inlet side heating spacer 82 Outlet side heating spacer USP Upstream passage MSP Midstream passage DSP Downstream passage

Claims (22)

  1. 　エンジンから排気通路へ排出される排気の一部をＥＧＲガスとしてＥＧＲ通路を介して吸気通路へ流して前記エンジンへ還流させるように構成したＥＧＲ装置において、
    　前記ＥＧＲ通路には、前記ＥＧＲガスの流量を調節するためのＥＧＲ弁が設けられ、
    　前記ＥＧＲ通路は、前記排気通路に近い上流側通路部と、前記吸気通路に近い下流通路部と、前記上流通路部と前記下流通路部との間の中流通路部とを含み、
    　前記中流通路部の少なくとも最下流部には、そこを流れるＥＧＲガスを保温するための保温手段が設けられる
    ことを特徴とするＥＧＲ装置。     In an EGR device configured to flow a part of the exhaust gas discharged from the engine to the exhaust passage as EGR gas to the intake passage through the EGR passage and return it to the engine.
    The EGR passage is provided with an EGR valve for adjusting the flow rate of the EGR gas.
    The EGR passage includes an upstream passage portion close to the exhaust passage, a downstream passage portion close to the intake passage, and a middle flow passage portion between the upstream passage portion and the downstream passage portion.
    An EGR device characterized in that at least the most downstream portion of the middle flow passage portion is provided with a heat insulating means for retaining heat of the EGR gas flowing therethrough.
  2. 　請求項１に記載のＥＧＲ装置において、
    　前記保温手段は、前記中流通路部を、前記ＥＧＲガスを保温する機能を有する樹脂材により形成することで構成される
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to claim 1,
    The heat insulating means is an EGR device characterized in that the middle flow passage portion is formed of a resin material having a function of retaining heat of the EGR gas.
  3. 　請求項１又は２に記載のＥＧＲ装置において、
    　前記保温手段は、前記中流通路部の内壁に設けられる断熱コートである
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to claim 1 or 2,
    The EGR device is characterized in that the heat retaining means is a heat insulating coat provided on the inner wall of the middle flow passage portion.
  4. 　請求項３に記載のＥＧＲ装置において、
    　前記中流通路部は、前記ＥＧＲガスを保温する機能を有する樹脂材により構成される配管を含み、
    　前記断熱コートは、その厚さが前記配管の下流側から上流側にかけて段階的又は徐々に増加するように形成される
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to claim 3,
    The middle flow passage portion includes a pipe made of a resin material having a function of retaining heat of the EGR gas.
    The EGR device is characterized in that the heat insulating coat is formed so that its thickness gradually or gradually increases from the downstream side to the upstream side of the pipe.
  5. 　請求項１乃至４のいずれかに記載のＥＧＲ装置において、
    　前記保温手段は、前記中流通路部の外側に設けられる空気層である
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to any one of claims 1 to 4.
    The EGR device is characterized in that the heat insulating means is an air layer provided outside the middle flow passage portion.
  6. 　請求項１乃至５のいずれかに記載のＥＧＲ装置において、
    　前記保温手段は、前記中流通路部を加熱するための加熱部を含む
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to any one of claims 1 to 5,
    The heat insulating means is an EGR device including a heating portion for heating the middle flow passage portion.
  7. 　請求項６に記載のＥＧＲ装置において、
    　前記加熱部は、通電により発熱する発熱被膜である
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to claim 6,
    The EGR device is characterized in that the heating unit is a heat-generating coating that generates heat when energized.
  8. 　請求項６に記載のＥＧＲ装置において、
    　前記加熱部は、前記中流通路部の少なくとも一部に形成され、温水が流れる温水通路により構成される
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to claim 6,
    The EGR device is characterized in that the heating portion is formed in at least a part of the middle flow passage portion and is composed of a hot water passage through which hot water flows.
  9. 　請求項８に記載のＥＧＲ装置において、
    　前記温水通路が設けられる前記中流通路部は、前記温水通路を挟んだ外側の外管と内側の内管とを含み、
    　前記外管の厚みが前記内管の厚みよりも大きい
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to claim 8,
    The middle flow passage portion provided with the hot water passage includes an outer outer pipe and an inner inner pipe sandwiching the hot water passage.
    An EGR device characterized in that the thickness of the outer tube is larger than the thickness of the inner tube.
  10. 　請求項８又は９に記載のＥＧＲ装置において、
    　前記温水通路は、前記中流通路部の流路長手方向に沿って設けられる
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to claim 8 or 9.
    The EGR device is characterized in that the hot water passage is provided along the flow path longitudinal direction of the middle flow passage portion.
  11. 　請求項８又は９に記載のＥＧＲ装置において、
    　前記中流通路部は、前記ＥＧＲ弁と、前記ＥＧＲ弁より下流に配置された配管とを含み、
    　前記ＥＧＲ弁と前記配管とが、前記ＥＧＲ弁の出口側に設けられる弁出口フランジと、前記配管の入口側に設けられる管入口フランジとを介して接続され、
    　前記配管と前記下流通路部とが、前記配管の出口側に設けられる管出口フランジと、前記下流通路部の入口側に設けられる通路部入口フランジとを介して接続され、
    　前記弁出口フランジと前記管入口フランジとの間及び前記管出口フランジと前記通路部入口フランジとの間の少なくとも一方に加熱スペーサが挟まって設けられ
    　前記温水通路は、前記加熱スペーサの周方向に沿って設けられる
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to claim 8 or 9.
    The midstream passage portion includes the EGR valve and a pipe arranged downstream of the EGR valve.
    The EGR valve and the pipe are connected via a valve outlet flange provided on the outlet side of the EGR valve and a pipe inlet flange provided on the inlet side of the pipe.
    The pipe and the downstream passage portion are connected via a pipe outlet flange provided on the outlet side of the pipe and a passage portion inlet flange provided on the inlet side of the downstream passage portion.
    A heating spacer is provided between the valve outlet flange and the pipe inlet flange and at least one of the pipe outlet flange and the passage portion inlet flange, and the hot water passage is provided along the circumferential direction of the heating spacer. An EGR device characterized in that it is provided.
  12. 　請求項８に記載のＥＧＲ装置において、
    　前記温水通路は、前記中流通路部の流路長手方向に沿って設けられる金属パイプにより構成される
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to claim 8,
    The EGR device is characterized in that the hot water passage is composed of a metal pipe provided along the longitudinal direction of the flow path of the middle flow passage portion.
  13. 　請求項１２に記載のＥＧＲ装置において、
    　前記金属パイプは、前記中流通路部に対しインサート成形により固定される
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to claim 12,
    The EGR device, wherein the metal pipe is fixed to the middle flow passage portion by insert molding.
  14. 　請求項１２に記載のＥＧＲ装置において、
    　前記中流通路部には、その流路長手方向に沿って前記金属パイプを保持するための保持手段が設けられ、
    　前記金属パイプは、前記中流通路部に対し前記保持手段により保持されることにより固定される
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to claim 12,
    The middle flow passage portion is provided with a holding means for holding the metal pipe along the longitudinal direction of the flow path.
    An EGR device characterized in that the metal pipe is fixed to the middle flow passage portion by being held by the holding means.
  15. 　請求項１４に記載のＥＧＲ装置において、
    　前記保持手段により保持される前記金属パイプと前記中流通路部との間には、伝熱部材が設けられる
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to claim 14,
    An EGR device characterized in that a heat transfer member is provided between the metal pipe held by the holding means and the middle flow passage portion.
  16. 　請求項１５に記載のＥＧＲ装置において、
    　前記伝熱部材は、前記金属パイプ及び前記中流通路部と密着する柔軟な伝熱シートである
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to claim 15,
    The EGR device is characterized in that the heat transfer member is a flexible heat transfer sheet that is in close contact with the metal pipe and the middle flow passage portion.
  17. 　請求項１４乃至１６のいずれかに記載のＥＧＲ装置において、
    　前記金属パイプと前記保持手段との間に、断熱用の空気層が設けられる
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to any one of claims 14 to 16.
    An EGR device characterized in that an air layer for heat insulation is provided between the metal pipe and the holding means.
  18. 　請求項２乃至１７のいずれかに記載のＥＧＲ装置において、
    　前記ＥＧＲ通路には、前記ＥＧＲガスを冷却するためのＥＧＲクーラと、前記ＥＧＲクーラをバイパスするためのバイパス通路と、前記バイパス通路を開閉するためのバイパス弁とが更に設けられ、
    　前記ＥＧＲクーラは、冷却用の熱交換器を含み、前記熱交換器は、前記ＥＧＲガスの入口と出口を含み、
    　前記バイパス通路は、前記ＥＧＲガスの入口と出口を含み、
    　前記中流通路部は、前記熱交換器の前記出口及び前記バイパス通路の前記出口より下流に位置し、
    　前記ＥＧＲ弁は、前記中流通路部に設けられる
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to any one of claims 2 to 17.
    The EGR passage is further provided with an EGR cooler for cooling the EGR gas, a bypass passage for bypassing the EGR cooler, and a bypass valve for opening and closing the bypass passage.
    The EGR cooler includes a heat exchanger for cooling, and the heat exchanger includes an inlet and an outlet for the EGR gas.
    The bypass passage includes an inlet and an outlet for the EGR gas.
    The middle flow passage portion is located downstream of the outlet of the heat exchanger and the outlet of the bypass passage.
    The EGR valve is an EGR device provided in the middle flow passage portion.
  19. 　請求項１７又は１８に記載のＥＧＲ装置において、
    　前記バイパス通路の少なくとも一部を冷却するための冷却部が更に設けられる
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to claim 17 or 18.
    An EGR device further provided with a cooling unit for cooling at least a part of the bypass passage.
  20. 　請求項２乃至１７のいずれかに記載のＥＧＲ装置において、
    　前記ＥＧＲ通路には、前記ＥＧＲガスを冷却するためのＥＧＲクーラが更に設けられ、前記ＥＧＲクーラは、冷却用の熱交換器を含み、前記熱交換器は、前記ＥＧＲガスの入口と出口を含み、
    　前記中流通路部は、前記熱交換器の前記出口より下流に位置し、
    　前記ＥＧＲ弁は、前記中流通路部に設けられる
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to any one of claims 2 to 17.
    The EGR passage is further provided with an EGR cooler for cooling the EGR gas, the EGR cooler includes a heat exchanger for cooling, and the heat exchanger includes an inlet and an outlet for the EGR gas. ,
    The middle flow passage portion is located downstream from the outlet of the heat exchanger.
    The EGR valve is an EGR device provided in the middle flow passage portion.
  21. 　請求項１乃至２０のいずれかに記載のＥＧＲ装置において、
    　前記ＥＧＲ弁は、前記ＥＧＲガスが流れる流路を含み、前記流路の内壁が前記ＥＧＲガスを保温する機能を有する樹脂材により構成される
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to any one of claims 1 to 20,
    The EGR valve includes a flow path through which the EGR gas flows, and the inner wall of the flow path is made of a resin material having a function of retaining heat of the EGR gas.
  22. 　請求項１６乃至２１のいずれかに記載のＥＧＲ装置において、
    　前記ＥＧＲ弁の前記流路は、入口と出口を含み、前記流路の前記入口が前記熱交換器の前記出口に略隣接して配置される
    ことを特徴とするＥＧＲ装置。     In the EGR apparatus according to any one of claims 16 to 21,
    The EGR apparatus, wherein the flow path of the EGR valve includes an inlet and an outlet, and the inlet of the flow path is arranged substantially adjacent to the outlet of the heat exchanger.
PCT/JP2021/040937 2020-11-13 2021-11-08 Egr device WO2022102561A1 (en)

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JP2000087810A (en) * 1998-09-08 2000-03-28 Hino Motors Ltd Exhaust gas recirculation system
JP2010180818A (en) * 2009-02-06 2010-08-19 Toyota Motor Corp Exhaust recirculating device for internal combustion engine
JP2014125974A (en) * 2012-12-26 2014-07-07 Daihatsu Motor Co Ltd Internal combustion engine
JP2014190333A (en) * 2013-03-28 2014-10-06 Mitsubishi Electric Corp EGR device
JP2015101987A (en) * 2013-11-22 2015-06-04 株式会社デンソー EGR valve device
JP2016023545A (en) * 2014-07-16 2016-02-08 愛三工業株式会社 Exhaust gas recirculation device for engine
JP2016075259A (en) * 2014-10-09 2016-05-12 愛三工業株式会社 Warm-up device of exhaust gas recirculation passage
JP2016079896A (en) * 2014-10-17 2016-05-16 アイシン精機株式会社 Air-intake apparatus
JP2019196769A (en) * 2018-05-11 2019-11-14 株式会社Ｓｏｋｅｎ Engine control system

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JPS5477818U (en) * 1977-11-11 1979-06-02
JPH06288305A (en) * 1993-03-31 1994-10-11 Suzuki Motor Corp Exhaust gas re-circulation device for engine
JP2000087810A (en) * 1998-09-08 2000-03-28 Hino Motors Ltd Exhaust gas recirculation system
JP2010180818A (en) * 2009-02-06 2010-08-19 Toyota Motor Corp Exhaust recirculating device for internal combustion engine
JP2014125974A (en) * 2012-12-26 2014-07-07 Daihatsu Motor Co Ltd Internal combustion engine
JP2014190333A (en) * 2013-03-28 2014-10-06 Mitsubishi Electric Corp EGR device
JP2015101987A (en) * 2013-11-22 2015-06-04 株式会社デンソー EGR valve device
JP2016023545A (en) * 2014-07-16 2016-02-08 愛三工業株式会社 Exhaust gas recirculation device for engine
JP2016075259A (en) * 2014-10-09 2016-05-12 愛三工業株式会社 Warm-up device of exhaust gas recirculation passage
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JP2019196769A (en) * 2018-05-11 2019-11-14 株式会社Ｓｏｋｅｎ Engine control system

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