EP2134955A1 - Kraftstoffinjektor - Google Patents
KraftstoffinjektorInfo
- Publication number
- EP2134955A1 EP2134955A1 EP08708433A EP08708433A EP2134955A1 EP 2134955 A1 EP2134955 A1 EP 2134955A1 EP 08708433 A EP08708433 A EP 08708433A EP 08708433 A EP08708433 A EP 08708433A EP 2134955 A1 EP2134955 A1 EP 2134955A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- fuel injector
- chamber
- fuel
- along
- 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
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
- 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
- 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
- F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
- F02M53/04—Injectors with heating, cooling, or thermally-insulating means
-
- 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
- F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
- F02M2547/003—Valve inserts containing control chamber and valve piston
-
- 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
- F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
- F02M2700/07—Nozzles and injectors with controllable fuel supply
- F02M2700/077—Injectors having cooling or heating means
Definitions
- Injector housing comprising a pressure chamber is injected from the high-pressure fuel into a combustion chamber of an internal combustion engine when the pressure in a control chamber by means of a control valve device is expanded into a pressure relief space.
- stroke-controlled fuel injection systems can be used in which the injection pressure can be adapted to load and speed.
- the object of the invention is to provide a fuel injector according to the preamble of claim 1, which has a long service life even at high injection pressures.
- the object is in a fuel injector with an injector housing, which includes a pressure chamber, is injected from the high-pressure fuel into a combustion chamber of an internal combustion engine, when the pressure in a control chamber by means of a control valve device is expanded into a pressure relief space, achieved in that the injector has a low pressure inlet, which runs through a purge path which passes through the pressure relief space , communicates with a low pressure return.
- the rinsing path can be used to cool temperature-critical areas of the injector in the pressure relief space. As a result, higher injection pressures can be realized than with conventional injectors.
- a preferred embodiment of the fuel injector is characterized in that the purge path extends along or past parts of the control valve device and / or an actuator.
- fuel injectors can be reduced in leakage or leak-free by dispensing with a low-pressure stage. As a result, the return amount of the injector can be significantly reduced. This essentially leaves the control quantity of the servo loop, which however has very high temperatures, since the control quantity is expanded by the system pressure via an outlet throttle.
- the permissible temperature range in the head region is exceeded. In the head area, the heat release via the injector housing is low.
- a further preferred embodiment of the fuel injector is characterized in that the low-pressure inlet and the low-pressure return are connected to the combustion chamber remote end of the injector.
- the combustion chamber remote end of the injector is also referred to as injector head.
- the control valve device and / or the actuator are preferably arranged in the injector head.
- Another preferred exemplary embodiment of the fuel injector is characterized in that the control chamber and the pressure relief space communicate with one another via a connecting channel, which runs through a valve piece, along which or along which the flushing path runs.
- the connecting channel can be closed by a closing body of the control valve device.
- a further preferred exemplary embodiment of the fuel injector is characterized in that the connecting channel in the valve piece has an outlet throttle, wherein the flushing path runs along or past the region of the valve piece in which the outlet throttle is arranged. Via the outlet throttle, when opening the control Valve device relaxes a control amount in the pressure relief chamber.
- Another preferred exemplary embodiment of the fuel injector is characterized in that the flushing path runs along or past the mouth region in which the connecting channel opens into the pressure relief chamber. This provides the advantage that the fuel heated by the drain throttle is immediately mixed with cool fuel.
- the pressure relief space communicates with an actuator receiving space in which an actuator is arranged, along which or along which the flushing path runs.
- the actuator is preferably the armature of a solenoid valve, which cooperates with an electromagnet of the control valve device.
- the actuator may also be a piezoactuator.
- Another preferred exemplary embodiment of the fuel injector is characterized in that the actuator is fastened to a valve needle, along which the rinse path runs along or past. As a result, cooling of the valve needle is made possible in a simple manner.
- Another preferred embodiment of the fuel injector is characterized in that a closing body is attached to the valve needle, along or past the rinsing path runs.
- the closing body serves to close the connecting channel and to release it in a targeted manner.
- the accompanying figure shows a schematic representation of a erfindunmultien fuel injector in longitudinal section.
- a fuel injector 1 is shown schematically in longitudinal section.
- the fuel injector 1 is supplied from a high-pressure reservoir or a high-pressure fuel source 2 with high-pressure fuel. Via a supply line 3, the fuel injector 1 is connected to the high-pressure storage space 2.
- the supply line 3 opens inside the fuel injector 1 into a high-pressure connection space 4, which is enclosed by an injector housing 6.
- the injector housing 6 comprises an injector body 7 and a nozzle body 8, which has a central guide bore 9.
- a nozzle needle 10 is guided back and forth movable.
- the nozzle needle 10 has a tip 11, which opens or closes a flow connection between spray holes 12, 13 and a pressure chamber 15 when the nozzle needle 10 moves away from the combustion chamber or toward the combustion chamber.
- a pressure shoulder 14 is formed, which is arranged in the pressure chamber 15.
- 10 flats 17, 18 are provided on the nozzle needle, which allow the passage of fuel from the high-pressure connection chamber 4 in the pressure chamber 15.
- the end of the nozzle needle 10 remote from the combustion chamber delimits a control chamber 22, which communicates with the high-pressure connection space 4 via a connecting channel 24, in which an inlet throttle is arranged. Via the connecting channel 24 with the inlet throttle, the control chamber 22 is filled with fuel, which is acted upon by high pressure.
- the control chamber 22 is recessed in a valve piece 26, which may be made in one or more parts.
- the connecting channel 24 extends through a part of the valve piece 26.
- a further connecting channel 29, which is equipped with an outlet throttle 30, extends through the valve piece 26 from the control chamber 22 to a pressure relief space 28.
- the mouth region of the connecting channel 29 is defined by a closing body 32nd lockable, which belongs to a control valve device 34.
- the control valve device 34 serves to control the opening movement of the nozzle needle 10.
- the closing body 32 is arranged at the end of a valve needle 36 close to the combustion chamber, which end is fixedly connected to an actuator 38.
- the actuator 38 is an armature which cooperates with a coil 39 of an electromagnet 40.
- the armature 38 is biased by a return spring 42 so that the closing body 32 closes the connecting channel 29 with the outlet throttle 30.
- the electromagnet 40 attracts the armature 38, so that the closing body 32, which is embodied here as a ball, lifts off from an associated seat and releases the connecting channel 29 with the outlet throttle 30. Then, the high-pressure fuel in the control chamber 22 is expanded into the pressure relief chamber 28.
- the control valve device 34 with the armature 38 is accommodated in the combustion chamber distal end 44 of the fuel injector 1, which is also referred to as injector head or injector housing head 44.
- the pressure relief space 28 communicates with a fuel tank via a return line.
- a cooling of temperature-critical areas in the injector head 44 is proposed by a low-pressure circuit of the injection system to solve the temperature problem.
- the fuel is led to the injector 1 on the low-pressure side, flows through the injector 1 and is subsequently returned in the return flow. This makes it possible to cool critical areas, in particular the injector head 44 with the control valve device 34.
- the fuel can be in the circulation of a low pressure pump be passed in sequence through all the injectors of an injection system to keep the cost of the wiring low.
- each injector can be equipped with an inlet and a return.
- the fuel acted upon with low pressure is supplied to the injector head 44 via a low-pressure inlet 45 in the form of a cooling flow, which is also referred to as flushing flow or flushing path.
- the low-pressure fuel reaches the pressure relief space 28 via through-holes 47, 48.
- the cooling flow or rinse path is guided so that critical points on the valve piece 26, in particular the areas in which the outlet throttle 30 is accommodated, are cooled. Furthermore, the cooling flow or rinse path runs past the mouth region of the connection channel 29 into the pressure relief space 28. This provides the advantage that the fuel heated by the drain throttle 30 is immediately mixed with cool fuel.
- the cooling flow or rinse path runs through a further through hole 50 from the pressure relief space 28 into an armature receiving space 52, in which the armature 38 is accommodated. From the anchor receiving space 52, the cooling flow passes through a return spring receiving space 54, in which the return spring 42 is arranged, in a low-pressure return 56th
- the opening and closing movement of the nozzle needle 10 is controlled by the control valve device 34.
- the associated control with the throttles in the connection channels 24 and 29 is also called termed control.
- control valve device 34 When the control valve device 34 is opened, heated fuel flows out of the control chamber 22 through the connection channel 29 and the outlet throttle 30 into the pressure relief chamber 28. The heated fuel mixes in the pressure relief chamber 28 with the cooling flow.
- low pressure is defined as a significantly lower pressure than the high pressure which is provided by the high-pressure fuel source 2 and prevails in the high-pressure connection space 4 and in the pressure space 15.
- the low pressure is provided via the low pressure inlet 45.
- the low pressure return 56 is connected, for example, to a fuel tank.
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 |
---|---|---|---|
DE102007011789A DE102007011789A1 (de) | 2007-03-12 | 2007-03-12 | Kraftstoffinjektor |
PCT/EP2008/051118 WO2008110406A1 (de) | 2007-03-12 | 2008-01-30 | Kraftstoffinjektor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2134955A1 true EP2134955A1 (de) | 2009-12-23 |
EP2134955B1 EP2134955B1 (de) | 2013-03-13 |
Family
ID=39276124
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08708433A Not-in-force EP2134955B1 (de) | 2007-03-12 | 2008-01-30 | Kraftstoffinjektor |
Country Status (4)
Country | Link |
---|---|
US (1) | US8128005B2 (de) |
EP (1) | EP2134955B1 (de) |
DE (1) | DE102007011789A1 (de) |
WO (1) | WO2008110406A1 (de) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7937936B2 (en) * | 2007-01-16 | 2011-05-10 | Deere & Company | Vehicle exhaust component arrangement |
US9163597B2 (en) * | 2008-10-01 | 2015-10-20 | Caterpillar Inc. | High-pressure containment sleeve for nozzle assembly and fuel injector using same |
DE102009000186A1 (de) * | 2009-01-13 | 2010-07-15 | Robert Bosch Gmbh | Vorrichtung zur Einspritzung von Kraftstoff |
DE102009027459A1 (de) * | 2009-07-03 | 2011-01-05 | Robert Bosch Gmbh | Kraftstoffeinspritzventil und Kraftstoffeinspritzsystem |
DE102009027932A1 (de) | 2009-07-22 | 2011-01-27 | Robert Bosch Gmbh | Kraftstoffinjektor und Kraftstoffeinspritzsystem |
AT509405A1 (de) | 2010-01-19 | 2011-08-15 | Bosch Gmbh Robert | Verfahren zum temperieren eines injektors einer einspritzung für das einspritzen von kraftstoff in den brennraum einer brennkraftmaschine |
DE102010001170A1 (de) * | 2010-01-25 | 2011-07-28 | Robert Bosch GmbH, 70469 | Einspritzvorrichtung mit reduzierten Druckschwingungen |
DE102010029250A1 (de) | 2010-05-25 | 2011-12-01 | Robert Bosch Gmbh | Kraftstoffinjektor |
HUE025828T2 (en) * | 2010-10-20 | 2016-05-30 | Delphi Int Operations Luxembourg Sarl | Improved fuel injector |
JP5699773B2 (ja) * | 2011-04-15 | 2015-04-15 | 株式会社デンソー | 燃料噴射装置及びそれを用いた燃料供給システム |
US8910882B2 (en) * | 2011-06-23 | 2014-12-16 | Caterpillar Inc. | Fuel injector having reduced armature cavity pressure |
US9228550B2 (en) | 2013-03-11 | 2016-01-05 | Stanadyne Llc | Common rail injector with regulated pressure chamber |
EP2829717A1 (de) * | 2013-07-23 | 2015-01-28 | Delphi International Operations Luxembourg S.à r.l. | Kraftstoffeinspritzer |
GB201400650D0 (en) * | 2014-01-15 | 2014-03-05 | Delphi Tech Holding Sarl | Bobbin with venting conduit |
US9719476B2 (en) * | 2014-07-14 | 2017-08-01 | Cummins Inc. | B-LCCR injector pilot valve orifice, armature and plunger guide arrangement |
DE102022213925A1 (de) | 2022-12-19 | 2024-06-20 | Robert Bosch Gesellschaft mit beschränkter Haftung | Injektor für flüssige oder gasförmige Brennstoffe und Verfahren zum Betreiben eines solchen Injektors |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2556356A (en) * | 1946-04-26 | 1951-06-12 | American Bosch Corp | Accumulator type injector nozzle |
US4603671A (en) | 1983-08-17 | 1986-08-05 | Nippon Soken, Inc. | Fuel injector for an internal combustion engine |
US4572433A (en) * | 1984-08-20 | 1986-02-25 | General Motors Corporation | Electromagnetic unit fuel injector |
JPH0354358A (ja) | 1989-07-21 | 1991-03-08 | Yamaha Motor Co Ltd | エンジンの高圧燃料噴射装置 |
US5148987A (en) * | 1990-07-05 | 1992-09-22 | Yamaha Hatsudoki Kabushiki Kaisha | High pressure fuel injection device for engine |
US5709194A (en) * | 1996-12-09 | 1998-01-20 | Caterpillar Inc. | Method and apparatus for injecting fuel using control fluid to control the injection's pressure and time |
US7021558B2 (en) * | 2003-04-25 | 2006-04-04 | Cummins Inc. | Fuel injector having a cooled lower nozzle body |
-
2007
- 2007-03-12 DE DE102007011789A patent/DE102007011789A1/de not_active Withdrawn
-
2008
- 2008-01-30 US US12/530,818 patent/US8128005B2/en not_active Expired - Fee Related
- 2008-01-30 EP EP08708433A patent/EP2134955B1/de not_active Not-in-force
- 2008-01-30 WO PCT/EP2008/051118 patent/WO2008110406A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2008110406A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2008110406A1 (de) | 2008-09-18 |
EP2134955B1 (de) | 2013-03-13 |
US8128005B2 (en) | 2012-03-06 |
US20100102143A1 (en) | 2010-04-29 |
DE102007011789A1 (de) | 2008-09-18 |
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