EP3006719B1 - Fuel injection valve - Google Patents
Fuel injection valve Download PDFInfo
- Publication number
- EP3006719B1 EP3006719B1 EP14807706.8A EP14807706A EP3006719B1 EP 3006719 B1 EP3006719 B1 EP 3006719B1 EP 14807706 A EP14807706 A EP 14807706A EP 3006719 B1 EP3006719 B1 EP 3006719B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- fuel injection
- passage
- valve
- chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
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Classifications
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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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
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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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/008—Arrangement of fuel passages inside of injectors
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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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
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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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices
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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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/165—Filtering elements specially adapted in fuel inlets to injector
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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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/02—Fuel-injection apparatus having means for reducing wear
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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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/27—Fuel-injection apparatus with filters
Definitions
- the present invention relates to a fuel injection valve used in an accumulator-type fuel injection control device of an internal combustion engine.
- the fuel injection valve which is used in an accumulator-type fuel injection control device of an internal combustion engine, where the fuel injection valve injects high pressure fuel supplied from a common rail (accumulator) into cylinders of the internal combustion engine.
- the fuel injection valve includes a housing, a nozzle body, a valve needle, and a back pressure control part.
- the fuel injection valve includes an inlet connecter.
- a high pressure pipe having one end thereof connected to the common rail is connected to the inlet connector.
- High pressure fuel is introduced into the inside of the fuel injection valve through a fuel passage formed in the inside of the inlet connecter.
- the introduced high pressure fuel is supplied to a fuel injection hole side formed in the nozzle body and, at the same time, the introduced high pressure fuel is also supplied to a control chamber side of the back pressure control part.
- the fuel injection is controlled in such a manner that the valve needle is advanced or retracted by adjusting a pressure in a control chamber thus controlling the opening and the closing of a fuel injection hole.
- the fuel injection valve described in PTL 1 is configured such that an edge filter is press-fitted into an inlet connector, and a foreign substance is collected by using gaps formed by the edge filter as filter meshes.
- the fuel injection valve described in PTL 2 is configured such that a large number of holes are formed in a portion of a filter body formed into a bag shape which faces an inner wall surface of an inlet portion. With such a configuration, a foreign substance in high pressure fuel can be collected by a body portion.
- the structure of the filter described in PTL 1 has a length in an axial direction of the inlet connecter thus giving rise to a possibility that a foreign substance larger than a formed gap passes through the gap.
- a reduction in a size of the hole formed in the body portion is limited and hence, it is difficult for the filter to collect a foreign substance having a size of several ⁇ m which reaches the fuel injection valve.
- the invention has been made in view of these problems, and it is an object of the invention to suppress the occurrence of a damage on a valve seat portion of a control valve of a back pressure control part caused by a foreign substance in high pressure fuel.
- a fuel injection valve having the features of new claim 1.
- Such a fuel injection valve can overcome the above-mentioned drawbacks.
- the inlet connector has an axial passage extending in an axial direction; and a plurality of circumferential passages extending in a circumferential direction from the axial passage, disposed offset from the center of the axial passage, and opens in the fuel chamber.
- an end portion of the axial passage on a fuel chamber side may be closed.
- a plurality of the circumferential passages is provided.
- a diameter of the circumferential passage may be set equal to or less than a diameter of the fuel injection hole.
- a plurality of the circumferential passages is provided, and a sum of cross-sectional areas of the circumferential passages may be set equal to or more than a total cross-sectional area of the fuel injection hole.
- the number of the circumferential passages is eight.
- Fig. 1 is a view schematically showing one example of the overall constitution of an accumulator-type fuel injection control device equipped with a fuel injection valve 1 according to this embodiment.
- the fuel injection valve 1 is shown in cross section.
- the accumulator-type fuel injection control device includes, as main constitutional elements thereof: a supply pump 52 which supplies fuel from a fuel tank 51 under pressure; a common rail 12 in which high pressure fuel supplied by the supply pump 52 under pressure is accumulated; and the fuel injection valve 1 which injects high pressure fuel accumulated in the common rail 12 to the inside of a cylinder of an internal combustion engine (not shown in the drawing).
- the overall constitution of this accumulator-type fuel injection control device per se is substantially equal to the constitution of a conventionally known accumulator-type fuel injection control device.
- the fuel injection valve 1 includes, as main constitutional elements thereof: an injector housing 2; a nozzle body 3; a valve needle 4; a valve piston 5; a valve body 6; a back pressure control part 7; and an inlet portion 8.
- the injector housing 2 and the nozzle body 3 correspond to "housing" of the invention.
- the nozzle body 3 is fastened to a distal end portion (a lower end side in Fig. 1 ) of the injector housing 2 by a nozzle nut 9.
- first fuel passages 11a, 11b through which high pressure fuel introduced from the inlet portion 8 is supplied to a fuel reservoir chamber 14 of the nozzle body 3 are formed.
- second fuel passage 13 through which fuel introduced from the inlet portion 8 is supplied to a control chamber 19 of the back pressure control part 7 is formed.
- the fuel reservoir chamber 14 is formed in the nozzle body 3 at a position where the fuel reservoir chamber 14 faces a pressure receiving portion 4A of the valve needle 4 in an opposed manner.
- a fuel injection hole 16 is formed in a distal end portion of the nozzle body 3. The fuel injection hole 16 is closed when a distal end portion of the valve needle 4 is seated on a seat portion 17 communicating with the fuel injection hole 16, while the fuel injection hole 16 is opened by separating (lifting) the valve needle 4 from the seat portion 17. With such a configuration, the injection of fuel can be started or stopped.
- a spring chamber 22 having a center thereof on a center axis of the injector housing 2 is formed, and a nozzle spring 18 for biasing the valve needle 4 in the direction toward the seat portion 17 is arranged in the spring chamber 22.
- the valve piston 5 is inserted into a hole 2A formed in the injector housing 2, the valve piston 5 is slidably inserted into a slide hole 6A formed in the valve body 6, and is arranged so as to be positioned in an upper portion of the valve needle 4.
- the control chamber 19 is formed in a portion of the valve body 6 where a top portion 5A of the valve piston 5 is positioned, and the top portion 5A of the valve piston 5 is faced from a lower side (fuel injection hole 16 side).
- the control chamber 19 communicates with an introducing side orifice 20 formed in the valve body 6.
- the introducing side orifice 20 communicates with the second fuel passage 13 through a pressure introducing chamber 21 formed annularly in a circumferential direction of the valve body 6 between the valve body 6 and the injector housing 2. With such a configuration, an introduced pressure from the common rail 12 is supplied to the control chamber 19.
- the control chamber 19 is also communicating with an open-close orifice 23, and the open-close orifice 23 is openable and closable by operating an electromagnetic valve 28 of the back pressure control part 7 described later.
- a pressure receiving area of the top portion 5A of the valve piston 5 in the control chamber 19 is set larger than a pressure receiving area of the pressure receiving portion 4A of the valve needle 4.
- the back pressure control part 7 includes, as main elements thereof: the electromagnetic valve 28; a holder 29; and the control chamber 19.
- the electromagnetic valve 28 includes: a magnet 25; an armature 27; and a control valve element 24.
- the armature 27 is attracted to the magnet 25 against a biasing force of the valve spring 26, the control valve element 24 is lifted from a valve seat face continuously formed with the open-close orifice 23 so that a pressure in the control chamber 19 can be released to a fuel return passage 15.
- a pressure in the control chamber 19 is controlled by operating the control valve element 24 thus controlling a back pressure of the valve needle 4 by way of the valve piston 5 whereby seating of the valve needle 4 on the seat portion 17 and lifting of the valve needle 4 from the seat portion 17 can be controlled.
- high pressure fuel from the common rail 12 acts on the pressure receiving portion 4A of the valve needle 4 in the inside of the fuel reservoir chamber 14 from the inlet portion 8 through the first fuel passages 11a, 11b, and also acts on the top portion 5A of the valve piston 5 in the inside of the control chamber 19 through the second fuel passage 13 and the pressure introducing chamber 21.
- the valve needle 4 is seated to the seat portion 17 of the nozzle body 3 due to a back pressure of the control chamber 19 which the valve needle 4 receives by way of the valve piston 5 and a biasing force of the nozzle spring 18 and hence, the fuel injection hole 16 is closed.
- valve needle 4 is seated to the seat portion 17 at a seating position by way of the valve piston 5 due to a pressure in the control chamber 19 and a biasing force of the nozzle spring 18 so that the fuel injection hole 16 is closed and the fuel injection is finished.
- Fig. 2 is an enlarged cross-sectional view of the inlet portion 8 of the fuel injection valve 1 shown in Fig. 1 .
- the inlet portion 8 is configured such that an inlet connector 30 is mounted in an inlet opening portion 2a formed in the injection housing 2.
- the inlet connector 30 is liquid-tightly and threadedly engaged with the inside of the inlet opening portion 2a.
- the inlet connector 30 includes: a cylindrical connector body 31 having both axial ends thereof opened; a flow passage forming member 33 held in the inside of the connector body 31; and a swirl flow forming portion 35 fixed to a distal end of the flow passage forming member 33.
- An outer peripheral portion of the flow passage forming member 33 is fixed to the inside of the connector body 31 liquid-tightly by press-fitting, welding or the like.
- the swirl flow forming portion 35 is fixed to a distal end surface of the flow passage forming member 33 by welding or the like.
- An axial passage 33a which opens at both axial ends of the flow passage forming member 33 and constitutes an inflow passage for high pressure fuel is formed in the flow passage forming member 33.
- an axial passage 35a and a circumferential passage 35b are formed in the swirl flow forming portion 35.
- the axial passage 35a is formed such that the axial passage 35a opens on one axial side of the swirl flow forming portion 35, an end portion of the axial passage 35a on a fuel chamber 40 side described later is closed and the above-mentioned opening communicates with the axial passage 33a of the flow passage forming member 33.
- the circumferential passage 35b is formed in an offset manner from the center of the axial passage 35a, and connects the axial passage 35a and an outer peripheral portion of the swirl flow forming portion 35 to each other.
- Fig. 3 is a cross sectional view taken along a line A-A in Fig. 2 and viewed from a direction indicated by an arrow.
- the swirl flow forming portion 35 includes a plurality of circumferential passages 35b formed in an extending manner in a tangential direction from the axial passage 35a at the center.
- eight circumferential passages 35b extending in the tangential direction respectively are formed at equal intervals.
- the fuel chamber 40 is formed by a distal end portion (a lower side portion shown in Fig. 2 ) of the inlet connector 30 and a bottom surface portion 2aa of the inlet opening portion 2a.
- a shim member 37 is sandwiched between a front-end-side surface (a lower side surface shown in Fig. 2 ) of the inlet connector 30 and the bottom surface portion 2aa of the inlet opening portion 2a so that leakage of high pressure fuel through a gap formed between the inlet connector 30 and the bottom surface portion 2aa of the inlet opening portion 2a can be suppressed.
- the first fuel passage 11a communicating with the fuel reservoir chamber 14 of the nozzle body 3 and the second fuel passage 13 communicating with the control chamber 19 of the back pressure control part 7 open at the bottom surface portion 2aa of the inlet opening portion 2a in a region of the fuel chamber 40.
- Fig. 4 is a view taken along a plane BB (the bottom surface portion 2aa of the inlet opening portion 2a) in Fig. 2 as viewed from a direction indicated by an arrow.
- the first fuel passage 11a opens at an outer peripheral portion of the bottom surface portion 2aa
- the second fuel passage 13 opens at a center portion of the bottom surface portion 2aa.
- a foreign substance mixed into high pressure fuel moves toward the outer peripheral portion of the fuel chamber 40 due to a centrifugal force and hence, the foreign substance minimally flows into the second fuel passage 13 communicating with the control chamber 19 of the back pressure control part 7. That is, in the fuel injection valve 1 of this embodiment, in place of collecting a foreign substance having a size of several ⁇ m in fuel supplied to the inlet connector 30 from the common rail 12, the foreign substance is separated to the outer peripheral portion of the fuel chamber 40 and is made to flow into a first fuel passage 11a side whereby fuel having relatively high cleanliness is made to flow into the control chamber 19 side of the back pressure control part 7. As a result, the erosion of the valve seat face of the electromagnetic valve 28 of the back pressure control part 7 by a foreign substance can be reduced.
- a diameter of the circumferential passage 35b of the swirl flow forming portion 35 is designed to a value equal to or less than a diameter of the fuel injection hole 16.
- the diameter of the fuel injection hole 16 is approximately 100 ⁇ m when the diameter of the fuel injection hole is small and hence, the diameter of the circumferential passage 35b can be set to approximately 100 ⁇ m. Accordingly, a foreign substance having a size which clogs the fuel injection hole 16 cannot pass through the circumferential passage 35b in advance and hence, clogging of the fuel injection hole 16 can be prevented.
- a sum of cross-sectional areas of the circumferential passages 35b of the swirl flow forming portion 35 is designed to be equal to or more than a total cross-sectional area of the fuel injection hole 16. Accordingly, a pressure loss of high pressure fuel supplied to the fuel injection valve 1 from the common rail 12 is minimally generated.
- the diameter of the circumferential passage 35b is decided to be equal to or more than the diameter of the fuel injection hole 16 and, at the same time, the number of the circumferential passages 35b is decided such that the sum of cross-sectional areas of the circumferential passages 35b becomes equal to or more than the total cross-sectional area of the fuel injection hole 16.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Description
- The present invention relates to a fuel injection valve used in an accumulator-type fuel injection control device of an internal combustion engine.
- Conventionally, there has been known a fuel injection valve which is used in an accumulator-type fuel injection control device of an internal combustion engine, where the fuel injection valve injects high pressure fuel supplied from a common rail (accumulator) into cylinders of the internal combustion engine. The fuel injection valve includes a housing, a nozzle body, a valve needle, and a back pressure control part.
- The fuel injection valve includes an inlet connecter. A high pressure pipe having one end thereof connected to the common rail is connected to the inlet connector. High pressure fuel is introduced into the inside of the fuel injection valve through a fuel passage formed in the inside of the inlet connecter. The introduced high pressure fuel is supplied to a fuel injection hole side formed in the nozzle body and, at the same time, the introduced high pressure fuel is also supplied to a control chamber side of the back pressure control part. In the back pressure control part, the fuel injection is controlled in such a manner that the valve needle is advanced or retracted by adjusting a pressure in a control chamber thus controlling the opening and the closing of a fuel injection hole.
- In such a fuel injection valve, when a hard foreign substance is mixed into the fuel, a valve seat face of a control valve in the back pressure control part corrodes thus giving rise to a possibility that the fuel injection valve loses accurate fuel injection control performance. Accordingly, there have been proposed fuel injection valves which are configured such that a filter is arranged in an inlet connector so as to collect a foreign substance in high pressure fuel introduced into the fuel injection valve (see PTL 1 or PTL 2).
- To be more specific, the fuel injection valve described in PTL 1 is configured such that an edge filter is press-fitted into an inlet connector, and a foreign substance is collected by using gaps formed by the edge filter as filter meshes.
- The fuel injection valve described in
PTL 2 is configured such that a large number of holes are formed in a portion of a filter body formed into a bag shape which faces an inner wall surface of an inlet portion. With such a configuration, a foreign substance in high pressure fuel can be collected by a body portion. -
- PTL 1:
JP-A-2006-105092 Fig. 2 - PTL 2:
JP-A-2009-203843 - PTL 3:
US 2003/080217 A1 - However, the structure of the filter described in PTL 1 has a length in an axial direction of the inlet connecter thus giving rise to a possibility that a foreign substance larger than a formed gap passes through the gap. On the other hand, in the filter described in
PTL 2, a reduction in a size of the hole formed in the body portion is limited and hence, it is difficult for the filter to collect a foreign substance having a size of several µm which reaches the fuel injection valve. - Particularly, recently, performance of a fuel main filter mounted on a portion of an accumulator-type fuel injection control device other than the fuel injection valve is improved. Accordingly, a foreign substance which reaches the fuel injection valve is smaller than the gaps of the filter structure of the fuel injection valve and hence, it has become difficult to collect a foreign substance in fuel using the conventional filter structure. Further, due to the further increase of a fuel pressure which is required to cope with recent strict regulation on an exhaust gas, there is a possibility that the erosion of a valve seat face of the control valve in the back pressure control part caused by the above-mentioned foreign substance may be accelerated.
- The invention has been made in view of these problems, and it is an object of the invention to suppress the occurrence of a damage on a valve seat portion of a control valve of a back pressure control part caused by a foreign substance in high pressure fuel.
- According to the invention, there is provided a fuel injection valve having the features of new claim 1. Such a fuel injection valve can overcome the above-mentioned drawbacks.
- In the fuel injection valve of the invention, the inlet connector has an axial passage extending in an axial direction; and a plurality of circumferential passages extending in a circumferential direction from the axial passage, disposed offset from the center of the axial passage, and opens in the fuel chamber.
- In the fuel injection valve not part of the invention, an end portion of the axial passage on a fuel chamber side may be closed.
- In the fuel injection valve of the invention, a plurality of the circumferential passages is provided.
- In the fuel injection not part of the invention, a diameter of the circumferential passage may be set equal to or less than a diameter of the fuel injection hole.
- In the fuel injection valve of the invention, a plurality of the circumferential passages is provided, and a sum of cross-sectional areas of the circumferential passages may be set equal to or more than a total cross-sectional area of the fuel injection hole.
- In the fuel injection valve of the invention, the number of the circumferential passages is eight.
- According to the fuel injection valve of the invention, it is possible to suppress a foreign substance in high pressure fuel which reaches the fuel injection valve from reaching a back pressure control part side and hence, it is possible to reduce a damage of a valve seat face of a control valve. Brief Description of Drawings
-
- [
Fig. 1] Fig. 1 is a view for explaining the overall constitution of an accumulator-type fuel injection control device equipped with a fuel injection valve according to this embodiment. - [
Fig. 2] Fig. 2 is a view for explaining an inlet portion of the fuel injection valve according to this embodiment. - [
Fig. 3] Fig. 3 is a view for explaining a swirl flow forming portion of an inlet connector. - [
Fig. 4] Fig. 4 is a view for explaining a bottom surface portion of a fuel chamber. - [
Fig. 5] Fig. 5 is a view showing the flow of fuel which flows into the fuel chamber. - Hereinafter, an embodiment relating to a fuel injection valve of the invention is specifically explained. However, this embodiment merely describes one mode of the invention and does not limit the invention. The invention can be altered as desired within the scope of claim 1. When the same symbol is used in the respective drawings, the symbol indicates an identical member unless otherwise specified.
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Fig. 1 is a view schematically showing one example of the overall constitution of an accumulator-type fuel injection control device equipped with a fuel injection valve 1 according to this embodiment. InFig. 1 , the fuel injection valve 1 is shown in cross section. - The accumulator-type fuel injection control device includes, as main constitutional elements thereof: a supply pump 52 which supplies fuel from a
fuel tank 51 under pressure; acommon rail 12 in which high pressure fuel supplied by the supply pump 52 under pressure is accumulated; and the fuel injection valve 1 which injects high pressure fuel accumulated in thecommon rail 12 to the inside of a cylinder of an internal combustion engine (not shown in the drawing). The overall constitution of this accumulator-type fuel injection control device per se is substantially equal to the constitution of a conventionally known accumulator-type fuel injection control device. - In such an accumulator-type fuel injection control device, the fuel injection valve 1 includes, as main constitutional elements thereof: an
injector housing 2; anozzle body 3; avalve needle 4; avalve piston 5; avalve body 6; a back pressure control part 7; and aninlet portion 8. In this embodiment, the injector housing 2 and thenozzle body 3 correspond to "housing" of the invention. - The
nozzle body 3 is fastened to a distal end portion (a lower end side inFig. 1 ) of theinjector housing 2 by anozzle nut 9. In theinjector housing 2 and thenozzle body 3,first fuel passages inlet portion 8 is supplied to afuel reservoir chamber 14 of thenozzle body 3 are formed. Further, in theinjector housing 2, asecond fuel passage 13 through which fuel introduced from theinlet portion 8 is supplied to acontrol chamber 19 of the back pressure control part 7 is formed. - The
fuel reservoir chamber 14 is formed in thenozzle body 3 at a position where thefuel reservoir chamber 14 faces a pressure receiving portion 4A of thevalve needle 4 in an opposed manner. Afuel injection hole 16 is formed in a distal end portion of thenozzle body 3. Thefuel injection hole 16 is closed when a distal end portion of thevalve needle 4 is seated on aseat portion 17 communicating with thefuel injection hole 16, while thefuel injection hole 16 is opened by separating (lifting) thevalve needle 4 from theseat portion 17. With such a configuration, the injection of fuel can be started or stopped. - In the inside of the
injector housing 2 to which thenozzle body 3 is fastened, aspring chamber 22 having a center thereof on a center axis of theinjector housing 2 is formed, and anozzle spring 18 for biasing thevalve needle 4 in the direction toward theseat portion 17 is arranged in thespring chamber 22. Further, thevalve piston 5 is inserted into ahole 2A formed in theinjector housing 2, thevalve piston 5 is slidably inserted into aslide hole 6A formed in thevalve body 6, and is arranged so as to be positioned in an upper portion of thevalve needle 4. - The
control chamber 19 is formed in a portion of thevalve body 6 where a top portion 5A of thevalve piston 5 is positioned, and the top portion 5A of thevalve piston 5 is faced from a lower side (fuel injection hole 16 side). Thecontrol chamber 19 communicates with an introducingside orifice 20 formed in thevalve body 6. The introducingside orifice 20 communicates with thesecond fuel passage 13 through apressure introducing chamber 21 formed annularly in a circumferential direction of thevalve body 6 between thevalve body 6 and theinjector housing 2. With such a configuration, an introduced pressure from thecommon rail 12 is supplied to thecontrol chamber 19. - The
control chamber 19 is also communicating with an open-close orifice 23, and the open-close orifice 23 is openable and closable by operating anelectromagnetic valve 28 of the back pressure control part 7 described later. A pressure receiving area of the top portion 5A of thevalve piston 5 in thecontrol chamber 19 is set larger than a pressure receiving area of the pressure receiving portion 4A of thevalve needle 4. - The back pressure control part 7 includes, as main elements thereof: the
electromagnetic valve 28; aholder 29; and thecontrol chamber 19. Theelectromagnetic valve 28 includes: amagnet 25; anarmature 27; and a control valve element 24. When a drive signal is supplied to themagnet 25 from a control circuit, thearmature 27 is attracted to themagnet 25 against a biasing force of thevalve spring 26, the control valve element 24 is lifted from a valve seat face continuously formed with the open-close orifice 23 so that a pressure in thecontrol chamber 19 can be released to afuel return passage 15. In this manner, a pressure in thecontrol chamber 19 is controlled by operating the control valve element 24 thus controlling a back pressure of thevalve needle 4 by way of thevalve piston 5 whereby seating of thevalve needle 4 on theseat portion 17 and lifting of thevalve needle 4 from theseat portion 17 can be controlled. - In the fuel injection valve 1 having such a configuration, high pressure fuel from the
common rail 12 acts on the pressure receiving portion 4A of thevalve needle 4 in the inside of thefuel reservoir chamber 14 from theinlet portion 8 through thefirst fuel passages valve piston 5 in the inside of thecontrol chamber 19 through thesecond fuel passage 13 and thepressure introducing chamber 21. - Accordingly, in a state where the
control chamber 19 is cut off from a fuel low pressure side by the control valve element 24, thevalve needle 4 is seated to theseat portion 17 of thenozzle body 3 due to a back pressure of thecontrol chamber 19 which thevalve needle 4 receives by way of thevalve piston 5 and a biasing force of thenozzle spring 18 and hence, thefuel injection hole 16 is closed. - On the other hand, by supplying the drive signal to the
magnet 25 at predetermined timing, thearmature 27 is attracted by themagnet 25 so that the control valve element 24 releases the open-close orifice 23. As a result, a high pressure in thecontrol chamber 19 returns to thefuel tank 51 through thefuel return passage 15 by way of the open-close orifice 23. Accordingly, a high pressure acting on the top portion 5A of thevalve piston 5 in thecontrol chamber 19 is released so that thevalve needle 4 is lifted from theseat portion 17 against a biasing force of thenozzle spring 18 due to a high pressure acting on the pressure receiving portion 4A whereby thefuel injection hole 16 is released and fuel injection is performed. - Then, when the
magnet 25 is demagnetized so that the open-close orifice 23 is closed by the control valve element 24, thevalve needle 4 is seated to theseat portion 17 at a seating position by way of thevalve piston 5 due to a pressure in thecontrol chamber 19 and a biasing force of thenozzle spring 18 so that thefuel injection hole 16 is closed and the fuel injection is finished. - Next, the
inlet portion 8 of the fuel injection valve 1 according to this embodiment is explained in detail. -
Fig. 2 is an enlarged cross-sectional view of theinlet portion 8 of the fuel injection valve 1 shown inFig. 1 . - The
inlet portion 8 is configured such that aninlet connector 30 is mounted in aninlet opening portion 2a formed in theinjection housing 2. In this embodiment, theinlet connector 30 is liquid-tightly and threadedly engaged with the inside of theinlet opening portion 2a. - The
inlet connector 30 includes: acylindrical connector body 31 having both axial ends thereof opened; a flowpassage forming member 33 held in the inside of theconnector body 31; and a swirlflow forming portion 35 fixed to a distal end of the flowpassage forming member 33. An outer peripheral portion of the flowpassage forming member 33 is fixed to the inside of theconnector body 31 liquid-tightly by press-fitting, welding or the like. The swirlflow forming portion 35 is fixed to a distal end surface of the flowpassage forming member 33 by welding or the like. - An
axial passage 33a which opens at both axial ends of the flowpassage forming member 33 and constitutes an inflow passage for high pressure fuel is formed in the flowpassage forming member 33. In the swirlflow forming portion 35, anaxial passage 35a and acircumferential passage 35b are formed. Theaxial passage 35a is formed such that theaxial passage 35a opens on one axial side of the swirlflow forming portion 35, an end portion of theaxial passage 35a on afuel chamber 40 side described later is closed and the above-mentioned opening communicates with theaxial passage 33a of the flowpassage forming member 33. Thecircumferential passage 35b is formed in an offset manner from the center of theaxial passage 35a, and connects theaxial passage 35a and an outer peripheral portion of the swirlflow forming portion 35 to each other. -
Fig. 3 is a cross sectional view taken along a line A-A inFig. 2 and viewed from a direction indicated by an arrow. As shown inFig. 3 , the swirlflow forming portion 35 includes a plurality ofcircumferential passages 35b formed in an extending manner in a tangential direction from theaxial passage 35a at the center. In the example shown inFig. 3 , eightcircumferential passages 35b extending in the tangential direction respectively are formed at equal intervals. - By mounting the
inlet connector 30 having such a configuration in the inside of theinlet opening portion 2a, thefuel chamber 40 is formed by a distal end portion (a lower side portion shown inFig. 2 ) of theinlet connector 30 and a bottom surface portion 2aa of theinlet opening portion 2a. In this embodiment, ashim member 37 is sandwiched between a front-end-side surface (a lower side surface shown inFig. 2 ) of theinlet connector 30 and the bottom surface portion 2aa of theinlet opening portion 2a so that leakage of high pressure fuel through a gap formed between theinlet connector 30 and the bottom surface portion 2aa of theinlet opening portion 2a can be suppressed. - The
first fuel passage 11a communicating with thefuel reservoir chamber 14 of thenozzle body 3 and thesecond fuel passage 13 communicating with thecontrol chamber 19 of the back pressure control part 7 open at the bottom surface portion 2aa of theinlet opening portion 2a in a region of thefuel chamber 40. -
Fig. 4 is a view taken along a plane BB (the bottom surface portion 2aa of theinlet opening portion 2a) inFig. 2 as viewed from a direction indicated by an arrow. As shown inFig. 4 , on the bottom surface portion 2aa of theinlet opening portion 2a in the region of thefuel chamber 40, thefirst fuel passage 11a opens at an outer peripheral portion of the bottom surface portion 2aa, and thesecond fuel passage 13 opens at a center portion of the bottom surface portion 2aa. - 1 High pressure fuel supplied from the
common rail 12 and introduced into theinlet connector 30 flows through theaxial passages inlet connecter 30 and, thereafter, is introduced into thefuel chamber 40 through thecircumferential passages 35b. At this stage of operation, since thecircumferential passages 35b are formed offset from the center of theaxial passage 35a, particularly, thecircumferential passages 35b are formed in the tangential direction in this embodiment, as shown inFig. 5 , the fuel introduced into thefuel chamber 40 forms a swirl flow. - Accordingly, a foreign substance mixed into high pressure fuel moves toward the outer peripheral portion of the
fuel chamber 40 due to a centrifugal force and hence, the foreign substance minimally flows into thesecond fuel passage 13 communicating with thecontrol chamber 19 of the back pressure control part 7. That is, in the fuel injection valve 1 of this embodiment, in place of collecting a foreign substance having a size of several µm in fuel supplied to theinlet connector 30 from thecommon rail 12, the foreign substance is separated to the outer peripheral portion of thefuel chamber 40 and is made to flow into afirst fuel passage 11a side whereby fuel having relatively high cleanliness is made to flow into thecontrol chamber 19 side of the back pressure control part 7. As a result, the erosion of the valve seat face of theelectromagnetic valve 28 of the back pressure control part 7 by a foreign substance can be reduced. - In the fuel injection valve 1 of this embodiment, a diameter of the
circumferential passage 35b of the swirlflow forming portion 35 is designed to a value equal to or less than a diameter of thefuel injection hole 16. For example, the diameter of thefuel injection hole 16 is approximately 100 µm when the diameter of the fuel injection hole is small and hence, the diameter of thecircumferential passage 35b can be set to approximately 100 µm. Accordingly, a foreign substance having a size which clogs thefuel injection hole 16 cannot pass through thecircumferential passage 35b in advance and hence, clogging of thefuel injection hole 16 can be prevented. - Further, in the fuel injection valve 1 of this embodiment, a sum of cross-sectional areas of the
circumferential passages 35b of the swirlflow forming portion 35 is designed to be equal to or more than a total cross-sectional area of thefuel injection hole 16. Accordingly, a pressure loss of high pressure fuel supplied to the fuel injection valve 1 from thecommon rail 12 is minimally generated. - That is, the diameter of the
circumferential passage 35b is decided to be equal to or more than the diameter of thefuel injection hole 16 and, at the same time, the number of thecircumferential passages 35b is decided such that the sum of cross-sectional areas of thecircumferential passages 35b becomes equal to or more than the total cross-sectional area of thefuel injection hole 16. By forming thecircumferential passages 35b in this manner, a pressure loss of high pressure fuel can be prevented and, at the same time, clogging of thefuel injection hole 16 by a foreign substance can be prevented.
Claims (3)
- A fuel injection valve (1) comprising:a housing (2, 3) having an inlet portion (8), a first fuel passage (11a, 11b) through which high pressure fuel introduced from the inlet portion (8) is supplied to a fuel reservoir chamber (14) communicating with a fuel injection hole (16) and a second fuel passage (13) through which high pressure fuel introduced from the inlet portion (8) is supplied to a pressure control chamber (19) of a back pressure control part (7);a valve needle (4) movably disposed in the inside of the housing (2, 3) in an advancing and retracting manner; anda control valve (24) performing an open-close control of the fuel injection hole (16) by advancing or retracting the valve needle (4) by adjusting a pressure in the pressure control chamber (19),wherein the inlet portion (8) is configured such that an inlet connector (30) is mounted in an inlet opening portion (2a) formed in the housing (2, 3), the inlet connector (30) having a first axial passage (33a) for the high pressure fuel,and wherein a fuel chamber (40) is formed between an end surface portion of the inlet connector (30) and a bottom surface portion (2aa) of the inlet opening portion (2a), the first fuel passage (11a, 11b) opening at an outer peripheral portion of the bottom surface portion (2aa) within a region of the fuel chamber (40), and the second fuel passage (13) opening at a center portion of the bottom surface portion (2aa),characterized in thata swirl flow forming portion (35) is fixed to an end of the first axial passage (33a), wherein a second axial passage (35a) extending in an axial direction and a plurality of circumferential passages (35b) extending in a circumferential direction from the second axial passage (35a) and disposed offset from the center of the second axial passage (35a) are such formed in the swirl flow forming portion (35) that the high pressure fuel introduced out of the first axial passage (33a) into the fuel chamber (40) through the second axial passage (35a) and the plurality of circumferential passages (35b) forms a swirl flow in a way that a foreign substance mixed into the high pressure fuel moves toward the outer peripheral portion of the fuel chamber (40) due to a centrifugal force and then flows through the first fuel passage (11a, 11b).
- The fuel injection valve (1) according to claim 1, wherein a sum of cross-sectional areas of the circumferential passages (35b) is set equal to or more than a total cross-sectional area of the fuel injection hole (16).
- The fuel injection valve (1) according to claim 1 or 2, wherein the number of the circumferential passages (35b) is eight.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013116609A JP6245681B2 (en) | 2013-06-03 | 2013-06-03 | Fuel injection valve |
PCT/JP2014/063183 WO2014196344A1 (en) | 2013-06-03 | 2014-05-19 | Fuel injection valve |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3006719A4 EP3006719A4 (en) | 2016-04-13 |
EP3006719A1 EP3006719A1 (en) | 2016-04-13 |
EP3006719B1 true EP3006719B1 (en) | 2017-09-27 |
Family
ID=52007997
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14807706.8A Not-in-force EP3006719B1 (en) | 2013-06-03 | 2014-05-19 | Fuel injection valve |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3006719B1 (en) |
JP (1) | JP6245681B2 (en) |
CN (1) | CN105283664B (en) |
WO (1) | WO2014196344A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TR201516233A2 (en) * | 2015-12-17 | 2017-03-21 | Bosch Sanayi Ve Tic A S | A fuel injector having filter |
WO2017102179A1 (en) * | 2015-12-17 | 2017-06-22 | Robert Bosch Gmbh | A fuel injector having filter |
JP6549508B2 (en) * | 2016-03-14 | 2019-07-24 | 日立オートモティブシステムズ株式会社 | Fuel injection valve |
JP6988196B2 (en) * | 2017-06-27 | 2022-01-05 | 株式会社Soken | Fuel injection device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1335127A2 (en) * | 2002-02-08 | 2003-08-13 | Hitachi, Ltd. | Electromagnetic fuel injection valve |
Family Cites Families (23)
Publication number | Priority date | Publication date | Assignee | Title |
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DE3201218A1 (en) * | 1982-01-16 | 1983-07-28 | Robert Bosch Gmbh, 7000 Stuttgart | FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES |
JPH02102364A (en) * | 1988-10-12 | 1990-04-13 | Hitachi Ltd | Electromagnetic fuel injection valve |
JPH036052U (en) * | 1989-06-06 | 1991-01-22 | ||
JPH07109964A (en) * | 1993-10-13 | 1995-04-25 | Nippondenso Co Ltd | Filter |
JPH08246993A (en) * | 1995-03-08 | 1996-09-24 | Nippondenso Co Ltd | Electromagnetic type fuel injection valve |
JP3814941B2 (en) * | 1997-05-29 | 2006-08-30 | 株式会社デンソー | Pressure sensor foreign matter intrusion prevention device |
JP3780472B2 (en) * | 2000-01-27 | 2006-05-31 | 愛三工業株式会社 | Fuel injection valve |
DE10052485B4 (en) * | 2000-10-23 | 2005-12-08 | Robert Bosch Gmbh | Fuel injector |
JP2002331209A (en) * | 2001-05-10 | 2002-11-19 | Denso Corp | Filter member and fuel injection device using it |
JP2003065180A (en) * | 2001-08-30 | 2003-03-05 | Denso Corp | Filter member and fuel injection device using same |
DE10132246A1 (en) * | 2001-07-04 | 2003-01-23 | Bosch Gmbh Robert | Fuel injector with high pressure resistant inlet |
JP2003129922A (en) * | 2001-10-25 | 2003-05-08 | Hitachi Ltd | Fuel injection valve with internal filter, and filter |
JP3841054B2 (en) * | 2002-08-08 | 2006-11-01 | 株式会社デンソー | Filter and fuel injection device using the same |
JP4311332B2 (en) | 2004-10-08 | 2009-08-12 | 株式会社デンソー | Fuel supply system |
JP2006336509A (en) * | 2005-05-31 | 2006-12-14 | Hitachi Ltd | Control device for fuel injection type internal combustion engine |
JP2006336594A (en) * | 2005-06-06 | 2006-12-14 | Denso Corp | Fuel filter |
JP4160595B2 (en) * | 2005-12-02 | 2008-10-01 | 株式会社日立製作所 | Electromagnetic fuel injection valve |
JP4682977B2 (en) * | 2006-12-27 | 2011-05-11 | 株式会社デンソー | Filter and fuel injection valve having the same |
JP4998325B2 (en) | 2008-02-27 | 2012-08-15 | 株式会社デンソー | Filter abnormality determination device for fuel injection valve and fuel injection system |
JP2009257511A (en) * | 2008-04-18 | 2009-11-05 | Denso Corp | Electromagnetic actuator |
EP2138707B1 (en) * | 2008-06-27 | 2011-03-23 | C.R.F. Società Consortile per Azioni | Fuel injector provided with a metering servovalve of a balanced type for an internal-combustion engine |
DE102011089925A1 (en) * | 2011-12-27 | 2013-06-27 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engines |
JP6202606B2 (en) * | 2013-07-08 | 2017-09-27 | ボッシュ株式会社 | Fuel injection valve |
-
2013
- 2013-06-03 JP JP2013116609A patent/JP6245681B2/en not_active Expired - Fee Related
-
2014
- 2014-05-19 WO PCT/JP2014/063183 patent/WO2014196344A1/en active Application Filing
- 2014-05-19 CN CN201480031671.2A patent/CN105283664B/en not_active Expired - Fee Related
- 2014-05-19 EP EP14807706.8A patent/EP3006719B1/en not_active Not-in-force
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1335127A2 (en) * | 2002-02-08 | 2003-08-13 | Hitachi, Ltd. | Electromagnetic fuel injection valve |
Also Published As
Publication number | Publication date |
---|---|
JP6245681B2 (en) | 2017-12-13 |
CN105283664A (en) | 2016-01-27 |
JP2014234764A (en) | 2014-12-15 |
EP3006719A4 (en) | 2016-04-13 |
CN105283664B (en) | 2018-05-25 |
WO2014196344A1 (en) | 2014-12-11 |
EP3006719A1 (en) | 2016-04-13 |
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