EP2470776A1 - Fuel injector for an internal combustion engine - Google Patents
Fuel injector for an internal combustion engineInfo
- Publication number
- EP2470776A1 EP2470776A1 EP10735254A EP10735254A EP2470776A1 EP 2470776 A1 EP2470776 A1 EP 2470776A1 EP 10735254 A EP10735254 A EP 10735254A EP 10735254 A EP10735254 A EP 10735254A EP 2470776 A1 EP2470776 A1 EP 2470776A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- leakage
- throttle plate
- fuel injector
- channel
- throttle
- 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 42
- 238000002485 combustion reaction Methods 0.000 title description 5
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000009715 pressure infiltration Methods 0.000 description 1
- 239000007787 solid Substances 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
- 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
- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/004—Joints; Sealings
-
- 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
-
- 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
-
- 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
-
- 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
- F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
Definitions
- the invention relates to a fuel injector with an actuator module arranged in a holding body, wherein the holding body is clamped by means of a clamping nut with a nozzle body with the interposition of at least one formed as throttle plate, the throttle plate of at least one high-pressure channel, an inlet channel with an inlet throttle and a Drain passage is penetrated with an outlet throttle and wherein between the actuator module and the throttle plate actuated by the actuator module valve, comprising at least one valve pin and a sealing sleeve, is arranged to form a one of the throttle plate facing leakage chamber.
- Such a fuel injector is known from DE 10 2007 040 115 Al.
- This fuel injector has the structure described above, wherein in the leakage chamber the generated between the centering pin and the sealing sleeve per- manentleckagemenge of fuel is added.
- This permanent leakage quantity is discharged from the leakage chamber via a drain line into a low-pressure system or a return system.
- the drain line is incorporated into the throttle plate in the sealing surface between the throttle plate and the holding body receiving the actuator module and the valve.
- a further fuel injector in which the intermediate body is designed as a high-pressure body.
- the intermediate body is designed as a high-pressure body.
- at least one annular leakage channel is incorporated, which surrounds the passage of the high-pressure passage through the high-pressure body.
- Leakage channel is arranged so that taking into account the the surface pressures is given a reliable seal of the adjacent components.
- the invention is based on the object to provide a fuel injector len, in which the leakage discharge from the leakage chamber is ensured without affecting the tightness of the fuel injector in the adjacent areas to the throttle plate.
- a horizontal leakage drainage channel is recessed, which extends from the cylindrical outer periphery of the throttle plate to an area below the leakage space and which is hydraulich connected to the leakage chamber via a leakage channel.
- the leakage channel is preferably arranged vertically directly below the leakage chamber, and the fuel to be discharged is discharged from the mouth of the leakage drainage channel into the cylindrical outer periphery of the throttle plate in a suitable manner.
- Leckageab USAkanal is inserted into the throttle plate, which is hydraulich connected to the leakage drainage channel.
- This Leckageab USAkanal is also arranged vertically and opens in a further embodiment in a
- annular space disposed between the throttle plate and a valve body receiving the valve.
- the annular space can be embedded in the throttle plate and / or the valve body.
- the valve body may be formed as a further separate intermediate body or be part of the holding body. From the annulus of the leakage fuel via a drain line in a
- the leakage drainage channel is a leakage drainage bore, which in turn has a diameter of at least approximately 1.2 mm in a further embodiment.
- a sleeve extending between the leakage channel and the leakage discharge channel is inserted into the leakage drainage channel or the leakage drainage hole.
- This sleeve compensates for the local loss of stiffness possibly resulting in the throttle plate and further increases the values for the local surface pressures at the corresponding end faces.
- the extension of the sleeve between the leakage channel and the Leckageab technicallykanal ensures that radially the entire sealed area has a sufficiently high surface pressure.
- the sleeve may be made of the same ferrous material as the throttle plate, but it is also possible to produce the sleeve of a higher quality, especially solid ferrous material. The sleeve is after the deburring of the
- the sleeve has an inner diameter of 0.6 mm. This diameter is sufficient so that there is no throttling of the leakage amount carried out.
- the leakage drainage channel or the leakage drainage bore is arranged on the side of the throttle plate opposite the high-pressure channel. This site makes sense because in this area, the throttle plate is free of further breakthroughs.
- FIG. 1 shows a control valve-side section of a fuel injector for a
- FIG 2 is a perspective view of the throttle plate
- Figure 3 is a side view of the throttle plate with all channels in the throttle plate and a drain hole without inserted sleeve and
- Figure 4 is a side view of the throttle plate with all channels in the throttle plate and with a sleeve inserted into the drain hole.
- FIG. 1 shows a control valve side portion of a fuel injector for a common rail system of a diesel injection.
- an electrically actuated actuator module 2 is used, which is actuated by an electronic engine control unit according to the operator requirements.
- the actuator module 2 is preferably a piezoactuator, which is in the representation in a non-switched state.
- the actuator module 2 cooperates with a valve pin 4, which in a sealing sleeve 5 against the force of a valve spring 6 lutzsbe- is arranged wegbar.
- the valve pin 4 has a sealing surface 7 which, in the closed state of the valve, cooperates sealingly with a seat surface 8 incorporated in a valve plate 9.
- a valve space 10 is formed below the seat surface 8, which extends partially surrounding the sealing sleeve 5 inserted in the valve plate 9 as far as a throttle plate-side end of the valve plate 9.
- the actuating lug 3 moves the valve pin 4 in the direction of the throttle plate 11 adjoining the valve plate 9 and lifts the sealing surface 7 of the valve pin 4 from the seat surface 8 of the valve plate 9, so that a flow connection between the Valve chamber 10 and formed in the holding body 1 low-pressure space, which is part of a return system for fuel is formed.
- a nozzle body 12 connects, by means of a
- Clamping nut 13 with the inclusion of the throttle plate 11 and the valve plate 9 with the holding body 1 is firmly clamped.
- a nozzle needle not shown is guided axially displaceable, wherein only one end portion of a nozzle needle piston 14 is visible from the nozzle needle.
- the nozzle needle piston 14 delimits a control chamber 17 which is located on the nozzle needle piston
- control chamber 17 opens an inlet channel 18 ( Figure 2) with an inlet throttle arranged therein and a drain channel 19 ( Figure 2) with an outlet throttle arranged therein.
- the inlet channel 18 is connected to a high-pressure line 15, via the fuel, in particular diesel fuel, through a high pressure passage 16 in the
- Throttle plate 11 is fed to a nozzle needle pressure chamber explained below.
- the drainage channel 19 connects the control chamber 17 with the valve chamber 10 so that in the idle state in the valve chamber 10, in the control chamber 17 and in the nozzle needle pressure chamber, the fuel pressure prevailing in the high-pressure line 15 prevails, for example 2000 bar.
- the nozzle needle In order to inject fuel into the combustion chamber of the internal combustion engine assigned to a fuel injector, the nozzle needle must be moved from a closed position to an open position. The fuel then passes from the nozzle needle pressure chamber via injection channels in the nozzle body the combustion chamber. To open the nozzle needle, the nozzle needle piston 14 must be moved in the direction of the throttle plate 11.
- the actuator module 2 is switched.
- the sealing surface 7 of the valve pin 4 is lifted off the seat 8 and in the
- Valve space 10 located fuel can flow into the low pressure space, so that the pressure prevailing in the valve chamber 10 fuel pressure is reduced. Fuel also flows out of the control chamber 17 through the outlet channel 19, so that a pressure reduction is also effected in the control chamber 17 which triggers the movement of the nozzle needle piston 14 in the direction of the throttle plate 11.
- the fuel pressure in the control chamber 17 and the valve chamber 10 is again increased to such a pressure sufficient to adjust the nozzle needle piston 14 and thus the nozzle needle in the closed position.
- a horizontal leakage drainage channel 20 is incorporated into the throttle plate 11 which is connected to the leakage space 21 via a vertical leakage channel 22. From the leakage drainage passage 20, the leakage fuel is discharged via a leakage discharge passage 23 into an annular space 24a, which is incorporated in the valve plate 9 and which is connected to the low-pressure system.
- annular space 24b In the throttle plate 11 opposite to the annular space 24a, a further annular space 24b is incorporated.
- FIG. 2 shows a perspective illustration of the throttle plate 11 with the leakage drainage channel 20 with the opening leakage channel 22 and leakage discharge channel 23.
- the high-pressure channel 16 is arranged, while approximately at right angles to an imaginary connecting line between the leakage outlet channel 20 and the high-pressure channel 16 two pin holes 26a, 26b are arranged eccentrically to the center of the throttle plate 11. In this pin holes 26 a, 26 b fixing pins are used, which in corresponding
- FIG 3 shows a side view of the throttle plate 11 with all channels / or holes in the throttle plate 11.
- the leakage drain passage 20 is formed in this figure caseless, while in the corresponding figure 4 in the leakage drain passage 1, a sleeve 25 is inserted.
- the sleeve 25 has an inner diameter of about 0.6 mm and extends between the leakage channel 22 and the Leckageabfederkanal 23rd
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 (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009028979A DE102009028979A1 (en) | 2009-08-28 | 2009-08-28 | Fuel injector for an internal combustion engine |
PCT/EP2010/060411 WO2011023466A1 (en) | 2009-08-28 | 2010-07-19 | Fuel injector for an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2470776A1 true EP2470776A1 (en) | 2012-07-04 |
EP2470776B1 EP2470776B1 (en) | 2015-09-09 |
Family
ID=43033067
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10735254.4A Active EP2470776B1 (en) | 2009-08-28 | 2010-07-19 | Fuel injector for an internal combustion engine |
Country Status (5)
Country | Link |
---|---|
US (1) | US9133805B2 (en) |
EP (1) | EP2470776B1 (en) |
CN (1) | CN102483018B (en) |
DE (1) | DE102009028979A1 (en) |
WO (1) | WO2011023466A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012212614A1 (en) | 2012-07-18 | 2014-01-23 | Continental Automotive Gmbh | Piezo injector with hydraulically coupled nozzle needle movement |
DE102012222509A1 (en) | 2012-12-07 | 2014-06-12 | Continental Automotive Gmbh | piezoinjector |
DE102012223934B4 (en) | 2012-12-20 | 2015-10-15 | Continental Automotive Gmbh | piezoinjector |
GB2549094A (en) * | 2016-04-04 | 2017-10-11 | Delphi Int Operations Luxembourg Sarl | Fuel injector |
Family Cites Families (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4142940C2 (en) * | 1991-12-24 | 1994-01-27 | Bosch Gmbh Robert | Electrically controlled pump nozzle |
JP3584554B2 (en) * | 1995-07-26 | 2004-11-04 | 株式会社デンソー | Accumulation type fuel injection device |
US6027037A (en) * | 1995-12-05 | 2000-02-22 | Denso Corporation | Accumulator fuel injection apparatus for internal combustion engine |
US5893516A (en) * | 1996-08-06 | 1999-04-13 | Lucas Industries Plc | Injector |
US6237570B1 (en) * | 1997-10-09 | 2001-05-29 | Denso Corporation | Accumulator fuel injection apparatus |
US6119962A (en) * | 1998-08-07 | 2000-09-19 | Caterpillar Inc. | Fuel injector having a trapped volume nozzle assembly with a pressure relief valve |
US20020174854A1 (en) * | 1998-10-16 | 2002-11-28 | Ning Lei | Fuel injector with direct needle valve control |
US6471142B1 (en) * | 1999-04-01 | 2002-10-29 | Delphi Technologies, Inc. | Fuel injector |
JP3631413B2 (en) * | 2000-04-27 | 2005-03-23 | 株式会社デンソー | Solenoid valve and fuel injection device using the same |
DE10037388A1 (en) * | 2000-08-01 | 2002-02-21 | Bosch Gmbh Robert | Valve arrangement, in particular for a fuel injection system of an internal combustion engine |
DE10213380B4 (en) * | 2001-09-04 | 2010-08-12 | Robert Bosch Gmbh | Fuel injection valve for an internal combustion engine |
DE10205970A1 (en) * | 2002-02-14 | 2003-09-04 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
US6769635B2 (en) * | 2002-09-25 | 2004-08-03 | Caterpillar Inc | Mixed mode fuel injector with individually moveable needle valve members |
US6945475B2 (en) * | 2002-12-05 | 2005-09-20 | Caterpillar Inc | Dual mode fuel injection system and fuel injector for same |
US7059301B2 (en) * | 2003-02-20 | 2006-06-13 | Caterpillar Inc. | End of injection rate shaping |
US6955114B2 (en) * | 2003-12-05 | 2005-10-18 | Caterpillar Inc | Three way valve and electro-hydraulic actuator using same |
US7455243B2 (en) * | 2004-03-03 | 2008-11-25 | Caterpillar Inc. | Electronic unit injector with pressure assisted needle control |
DE102004061800A1 (en) * | 2004-12-22 | 2006-07-06 | Robert Bosch Gmbh | Injector of a fuel injection system of an internal combustion engine |
JP4380549B2 (en) * | 2005-01-31 | 2009-12-09 | 株式会社デンソー | Fuel injection valve |
DE102005059437A1 (en) * | 2005-12-13 | 2007-06-14 | Robert Bosch Gmbh | fuel injector |
JP4428357B2 (en) * | 2006-04-03 | 2010-03-10 | 株式会社デンソー | Fuel injection valve |
DE102006050163A1 (en) * | 2006-10-25 | 2008-04-30 | Robert Bosch Gmbh | Injector i.e. common rail injector, for injecting fuel into combustion chamber of internal combustion engine, has spring pressing piston on seat and casing on surface, where piston diameter in casing corresponds to piston diameter at seat |
DE102007013249A1 (en) | 2007-03-20 | 2008-09-25 | Robert Bosch Gmbh | Fuel injector with improved injection behavior |
DE102007040115A1 (en) | 2007-08-24 | 2009-02-26 | Robert Bosch Gmbh | Control valve for actuating control chamber of fuel injector, has valve piston, which is guided in valve body in axially movable manner and is operated by actuator |
DE102008001330A1 (en) * | 2008-04-23 | 2009-10-29 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engines |
DE102008042158A1 (en) * | 2008-09-17 | 2010-03-18 | Robert Bosch Gmbh | Fuel injector |
DE102009026564A1 (en) * | 2009-05-29 | 2010-12-02 | Robert Bosch Gmbh | Fuel injector for injecting fuel into combustion chamber of internal-combustion engine, has control valve element that is formed and arranged such that small resulting hydraulic force is applied on control valve element |
-
2009
- 2009-08-28 DE DE102009028979A patent/DE102009028979A1/en not_active Withdrawn
-
2010
- 2010-07-19 CN CN201080037897.5A patent/CN102483018B/en active Active
- 2010-07-19 EP EP10735254.4A patent/EP2470776B1/en active Active
- 2010-07-19 US US13/389,344 patent/US9133805B2/en active Active
- 2010-07-19 WO PCT/EP2010/060411 patent/WO2011023466A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2011023466A1 * |
Also Published As
Publication number | Publication date |
---|---|
US9133805B2 (en) | 2015-09-15 |
WO2011023466A1 (en) | 2011-03-03 |
CN102483018B (en) | 2015-06-17 |
US20120138019A1 (en) | 2012-06-07 |
DE102009028979A1 (en) | 2011-03-03 |
EP2470776B1 (en) | 2015-09-09 |
CN102483018A (en) | 2012-05-30 |
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