EP2726728A1 - Kraftstoffinjektor - Google Patents
KraftstoffinjektorInfo
- Publication number
- EP2726728A1 EP2726728A1 EP12720199.4A EP12720199A EP2726728A1 EP 2726728 A1 EP2726728 A1 EP 2726728A1 EP 12720199 A EP12720199 A EP 12720199A EP 2726728 A1 EP2726728 A1 EP 2726728A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel injector
- fuel
- return
- control 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.)
- Granted
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 95
- 239000002131 composite material Substances 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 description 9
- 238000007789 sealing Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- F02M55/002—Arrangement of leakage or drain conduits in or from injectors
-
- 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
-
- 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/0043—Two-way valves
-
- 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
- F02M63/0073—Pressure balanced valves
-
- 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
- F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
- F02M2547/001—Control chambers formed by movable sleeves
Definitions
- the invention relates to a fuel injector according to the preamble of claim 1.
- Such a fuel injector is known from DE 10 2008 001 330 A1 of the Applicant.
- the movement of a nozzle needle arranged in a nozzle needle is generated via a control valve, which has a valve element, which in turn via a solenoid actuator or a piezoelectric actuator, at least indirectly, is controlled.
- a control amount is derived in the receiving space of the Magnetaktors or the piezoelectric actuator, which in turn has a connection to a return port to the fuel injector.
- the outflow of the fuel via throttles and the valve seat of the valve element is associated with a strong pressure reduction of the originally high-pressure fuel. Such pressure reduction is physically associated with a temperature increase of the fuel.
- the present invention seeks to further develop a fuel injector according to the preamble of claim 1 such that the flowing into the receiving space for the piezoelectric actuator as well as in the return bore fuel occurs with respect to the prior art reduced temperature, without the need for additional (external) fuel supply from an area outside the fuel injector.
- This object is achieved in a fuel injector with the features of claim 1 according to the invention that the outflowing when switching the control valve control amount passes through a flow path in an annular intermediate region between the nozzle retaining nut and the nozzle body and / or the valve plate and / or throttle plate. There, the fuel can be cooled before it enters the immediate vicinity of temperature-sensitive components.
- the diversion channel and the return channel are formed at least substantially as arranged radially to the longitudinal axis of the valve plate channels.
- control quantity flows out of the control valve chamber into the actuator chamber.
- Sealing sleeve passes under high pressure fuel in a leakage or low pressure chamber or a Abiaufbohrung. Since the fuel flowing into the annular gap has previously been heated, if necessary, by the flow through the throttles and then compressed again by the closing of the control valve, a particularly high fuel temperature can be produced here by reheating the already heated fuel. Therefore, it is proposed in a further variant that an additional connection between the leakage or low-pressure chamber and the return bore is provided, which is connected to the annulus.
- connection has a drain, which opens into a discharge channel.
- diversion channel opens via the annulus and a return channel in a riser, which is connected to the return line.
- FIG. 1 shows a partial region of a fuel injector according to the prior art in a longitudinal section
- Fig. 2 shows a detail of a fuel injector according to the invention, in
- FIG. 4 shows a fuel injector according to the invention, in which a leakage quantity from a low-pressure space in an annular space is cooled, likewise in kinked longitudinal sections.
- a fuel injector 1 according to the prior art is shown in longitudinal section.
- the fuel injector 1 has a holding body 2, a valve plate 4, a throttle plate 6 and a nozzle body 8 which abut each other in this order.
- the components are pressed against each other by a (nozzle) clamping nut 9, which is supported on a shoulder of the nozzle body 8 and is held by a thread on the holding body 2.
- a (nozzle) clamping nut 9 which is supported on a shoulder of the nozzle body 8 and is held by a thread on the holding body 2.
- an annular space 5 is formed, in the area at least the valve plate 4 and the throttle plate 6 spaced from the clamping nut 9 are arranged.
- a pressure chamber 14 is formed, in which a piston-shaped nozzle needle 10 is arranged longitudinally displaceable.
- the nozzle needle 10 has at its end facing the combustion chamber on a sealing surface 11, with which it cooperates with a nozzle seat 13 which is formed at the combustion chamber end of the pressure chamber 14. From the nozzle seat 13 go from one or more injection ports 12, which open in installation position of the fuel injector 1 directly into a combustion chamber of the internal combustion engine.
- the nozzle needle 10 is guided in a middle section in the pressure chamber 14, wherein the fuel is passed through several slits 15 to the injection openings 12.
- the nozzle needle 10 is guided at its end remote from the combustion chamber of the internal combustion engine in a sleeve 22, wherein the sleeve 22 by a closing spring 18 which surrounds the nozzle needle 10 and the sleeve 22 facing away indirectly supported on a shoulder 16, presses against the throttle plate 6 ,
- a control chamber 20 is limited, which is filled with fuel, so that exerted by the pressure in the control chamber 20, a hydraulic force on the side remote from the combustion chamber end face of the nozzle needle 10 and exerts a force in the direction of the nozzle seat 13 on the nozzle needle 10.
- an inlet channel 25 is formed, is passed through the compressed fuel under high pressure from a high-pressure fuel source in the pressure chamber 14.
- the inlet channel 25 is connected to the control chamber 20 via an inlet throttle 40 extending in the throttle plate 6. With a certain time delay is thus always the same fuel pressure in the inlet channel 25 and the control chamber 20 when the control valve 30 is closed.
- control valve 30 For controlling the fuel pressure in the control chamber 20, the switchable between two switching positions control valve 30 is provided in the valve plate 4, wherein the control valve 30 has a control valve chamber 31 which is formed as a cavity in the valve plate 4.
- the control valve chamber 31 is connected via a drain throttle 42, which is formed in the throttle plate 6, connected to the control chamber 20 in the nozzle body 8.
- a control valve member 34 is arranged longitudinally displaceable, wherein the control valve member 34 has a piston-shaped shape and at its end facing away from the throttle plate 6 has a mushroom-shaped extension on which a sealing surface 52 is formed, with which the control valve member 34 cooperates with a control valve seat 37, which is formed on the inside of the control valve chamber 31.
- the control valve member 34 is guided at its end remote from the control valve seat 37 in a sleeve 36 which is supported at one end to the throttle plate 6, and between the and the control valve member 34, a spring 38 is arranged under compressive prestress. By the force of the spring 38, the control valve member 34 is pressed against the control valve seat 37 on the one hand, and the sleeve 36 against the throttle plate 6 on the other hand.
- the movement of the control valve member 34 in the control valve chamber 31 occurs via a in a coupler housing
- the piston 32 with the coupler housing 33 is located in an actuator chamber 23, which is always in the form of an actuator receiving space and is always under low pressure, which is always depressurized.
- a leakage chamber 54 is limited, in which a low pressure is present, and is relieved of pressure via a drain 45 drain.
- the leakage oil drain 45 may in this case have, for example, a connection to the actuator chamber 23.
- a fuel injector 100 In order to keep the component load on the piezo actuator in the actuator chamber 23 as low as possible, it is provided in a fuel injector 100 according to the invention that the fuel flowing via the control valve seat 37 in the direction of the coupler body 33 at least partially, but preferably completely via one or more Outlet channels 60 is guided or discharged into the annular space 5.
- a single diversion channel 60 is shown in FIG. 2, which is arranged radially to the longitudinal axis of the valve plate 4.
- the diversion channel 60 is located in an upper end region of the valve plate 4 with respect to the fuel injector 100.
- a return channel 61 which projects radially inwardly from the edge of the throttle plate 6, and 62 has a vertically arranged mulchleitkanalabintroductory connection with a circumferential annular groove 63 , which is formed on the throttle plate 6 facing the end face of the valve plate 4, and preferably on the return channel portion 62 opposite side hydraulically with a recognizable in particular in FIG. 4 riser 64 connection, which is formed in the region of the valve plate 6.
- the riser 64 in turn has hydraulic connection with a retaining body 2 formed in the return bore 65 which is connected to a return port, not shown, of the fuel injector 100.
- the leakage chamber 54 is connected to the return channel 61 via a leakage oil outlet 45a.
- the leakage chamber 54 can also have a leakage oil outlet 45 in accordance with the prior art (compare FIG.
- FIG. 3 shows an alternative flow guide for removing fuel from the leakage chamber 54.
- the flow guide according to FIG. 2 has a leakage oil drain 45a which has a connection to the annular space 5 via a discharge channel 71 arranged radially in the throttle plate 6.
- a radially arranged herbleitkanal 72 is formed in an upper axial region, which also has connection with the annular space 5, and which opens into the riser 64.
- FIG. 4 shows a flow guide for the fuel from the leakage chamber 54 that has been modified with respect to FIG. 3.
- the fuel also passes through the leakage oil drain 45a and the discharge channel 71 into the annulus 5.
- the return channel 75 consisting of the partial channel sections 76, 77, is formed in the throttle plate 6, as well Has connection with the annular space 5, and which opens into the riser 64. It may be provided that the vertical part of the channel section 76 of the return channel 75 is not concentric with the riser 64, but is arranged in a certain offset to this.
- a separating web (not shown) may be present in the preferably shorter distance between the vertical partial channel section 76 and the riser 64, so that the fuel has as long a flow path as possible until it enters the riser 64.
- the fuel injector 100 according to the invention thus far described can be modified or modified in many ways without departing from the spirit of the invention. This consists, at least partially, but preferably completely over a particular between the valve plate 4, the throttle plate 6, the nozzle body 8 and the Clamping nut 9 trained annular space 5 to lead, so that the fuel is cooled there. Conceivable modifications of the fuel injector 100 may be e.g. be such that only the fuel in the leakage chamber 54 is passed through the annulus 5.
Landscapes
- 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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011078381 | 2011-06-30 | ||
DE102011081643A DE102011081643A1 (de) | 2011-06-30 | 2011-08-26 | Kraftstoffinjektor |
PCT/EP2012/058808 WO2013000618A1 (de) | 2011-06-30 | 2012-05-11 | Kraftstoffinjektor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2726728A1 true EP2726728A1 (de) | 2014-05-07 |
EP2726728B1 EP2726728B1 (de) | 2015-11-04 |
Family
ID=47355064
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12720199.4A Active EP2726728B1 (de) | 2011-06-30 | 2012-05-11 | Kraftstoffinjektor |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2726728B1 (de) |
DE (1) | DE102011081643A1 (de) |
WO (1) | WO2013000618A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018211679A1 (de) * | 2018-07-12 | 2020-01-16 | Robert Bosch Gmbh | Kraftstoffinjektor und Verfahren zum Betreiben eines Kraftstoffinjektors |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007017126A1 (de) * | 2007-04-11 | 2008-10-16 | Robert Bosch Gmbh | Einspritzmodul |
DE102008001330A1 (de) | 2008-04-23 | 2009-10-29 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für Brennkraftmaschinen |
DE102009001099A1 (de) * | 2009-02-24 | 2010-08-26 | Robert Bosch Gmbh | Kraftstoffeinspritzventil |
DE102009027494A1 (de) * | 2009-07-07 | 2011-01-13 | Robert Bosch Gmbh | Kraftstoff-Injektor mit druckausgeglichenem Steuerventil |
DE102009055267A1 (de) * | 2009-12-23 | 2011-06-30 | Robert Bosch GmbH, 70469 | Druckausgeglichener Kraftstoffinjektor mit Bypass und minimiertem Ventilraumvolumen |
DE102010040381A1 (de) | 2010-09-08 | 2012-03-08 | Robert Bosch Gmbh | Kraftstoffinjektor und Kraftstoffeinspritzsystem mit wenigstens einem Kraftstoffinjektor |
-
2011
- 2011-08-26 DE DE102011081643A patent/DE102011081643A1/de not_active Withdrawn
-
2012
- 2012-05-11 WO PCT/EP2012/058808 patent/WO2013000618A1/de active Application Filing
- 2012-05-11 EP EP12720199.4A patent/EP2726728B1/de active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2013000618A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2726728B1 (de) | 2015-11-04 |
DE102011081643A1 (de) | 2013-01-03 |
WO2013000618A1 (de) | 2013-01-03 |
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