EP0922852A2 - Kraftstoffanlage - Google Patents

Kraftstoffanlage Download PDF

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Publication number
EP0922852A2
EP0922852A2 EP98309693A EP98309693A EP0922852A2 EP 0922852 A2 EP0922852 A2 EP 0922852A2 EP 98309693 A EP98309693 A EP 98309693A EP 98309693 A EP98309693 A EP 98309693A EP 0922852 A2 EP0922852 A2 EP 0922852A2
Authority
EP
European Patent Office
Prior art keywords
injector
fuel
pipe
clamp member
backleak
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.)
Withdrawn
Application number
EP98309693A
Other languages
English (en)
French (fr)
Other versions
EP0922852A3 (de
Inventor
Stephen Michael Parker
Peter Alban George Colingborn
Peter David Allen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Delphi Technologies Inc
Original Assignee
Lucas Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lucas Industries Ltd filed Critical Lucas Industries Ltd
Publication of EP0922852A2 publication Critical patent/EP0922852A2/de
Publication of EP0922852A3 publication Critical patent/EP0922852A3/de
Withdrawn legal-status Critical Current

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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
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and 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
    • F02M55/001—Pumps with means for preventing erosion on fuel discharge
    • 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
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet

Definitions

  • This invention relates to a fuel system for an internal combustion engine of the compression ignition type.
  • the invention relates to a fuel system of the type comprising an accumulator or common rail which is arranged to be charged with fuel by an appropriate high pressure fuel pump.
  • a plurality of individually actuable fuel injectors is connected through appropriate high pressure fuel pipes to the common rail or accumulator.
  • US 5365907 and US 3845748 describe arrangements in which a backleak channel is provided in a wall associated with an engine, appropriate passage means being provided to supply fuel from a backleak passage of an injector to the channel.
  • US 5419298 relates to an arrangement in which a high pressure fuel pipe between a pump and an injector is bent through approximately 180°, the ends of the pipe being substantially parallel to one another.
  • EP 0754854 illustrates an arrangement in which a high pressure connection to an injector is achieved using a banjo member.
  • EP 0627553 illustrates an arrangement in which a high pressure supply connector includes a low pressure fuel return path.
  • GB 2314123 also illustrates a high pressure connector including a low pressure fuel return path.
  • EP 0836003 relates to an injector having a body portion with laterally extending projections defining high and low pressure fuel passages.
  • a fuel system comprising an injector mounted in a bore of an engine cylinder head, a high pressure pipe arranged to supply fuel to the injector from a common rail, an end region of the pipe adjacent the injector extending in a direction substantially perpendicular to an axis of the injector, and a clamp member arranged to clamp the end region of pipe to the injector, the clamp member including a drilling defining a return fuel passage extending between the injector and a backleak channel provided in the cylinder head or a cam box wall or cover of the engine.
  • the fuel pipe is conveniently bent through approximately 180° so that the ends thereof are substantially parallel to one another.
  • Such a configuration is advantageous in that assembly is simplified as additional slack is available in the high pressure fuel pipe than would be the case if the ends of the pipe were coaxial.
  • the injector is provided with a seating with which an enlarged part of the fuel pipe is engageable to provide a substantially fluid tight seal between the fuel pipe and the injector.
  • the clamp member may be engageable with a banjo member mounted upon the injector, or alternatively, the clamp member may be engageable directly with the injector.
  • the injector may include a region extending in a direction substantially perpendicular to the axis of the injector with which the clamp member is engageable.
  • the invention also relates to a fuel system comprising a plurality of injectors mounted on an associated engine, a wall of the engine being provided with a backleak channel, and a plurality of clamp members whereby fuel from backleak passages of the injectors can flow to the backleak channel.
  • a fuel system comprising a fuel injector mounted in a bore of an engine cylinder head, a high pressure pipe arranged to supply fuel to the injector from a common rail, an end region of the pipe adjacent the injector extending in a direction substantially perpendicular to an axis of the injector, and a clamp member arranged to clamp the end region of the pipe to the injector, the injector including a region extending substantially perpendicularly to the axis of the injector and defining a return fuel passage which communicates, directly, with a backleak channel provided in the cylinder head or a cam box wall or cover of the engine.
  • the invention also relates to a fuel injector for use in such a fuel system.
  • Figure 1 illustrates a cylinder head 10 having bores formed therein within which a plurality of injectors 12 (only one of which is shown) is located.
  • the injectors 12 are of the electromagnetically actuated type and, other than as described hereinafter, the injectors 12 are of substantially conventional form.
  • the injectors 12 are substantially identical to one another and only one of the injectors will be described hereinafter.
  • Each injector defines an axis along which a valve needle is moveable, the needle being engageable with a seating to control the delivery of fuel by the injector.
  • the upper end of the injector 12 is provided with an electrical connector 14 whereby signals are applied to the injector 12 to control the operation of electrical or electromagnetic parts thereof to control the timing and duration of injection.
  • a connector cable 16 is secured to the connector 14 by means of a screw 18, the cable 16 terminating at a socket 20 which is located in part of the cam box cover 22 of the engine.
  • a frustoconical seating 24 is provided which communicates with a high pressure fuel supply passage 26 of the injector whereby fuel under pressure is applied to the injector.
  • An enlarged head 28 of a high pressure fuel pipe 30 engages the seating 24, the other end of the high pressure fuel pipe 30 being connected to a source of fuel at high pressure, the fuel source comprising a common rail 32 which is charged with fuel through an inlet connection 34 by an appropriate high pressure fuel pump (not shown).
  • a banjo member 36 is located around an upper part of the injector 12, the banjo member 36 including a through bore within which part of the injector 12 is located, and a radially extending passage through which the high pressure fuel pipe 30 extends to permit the head 28 thereof to engage the seating 24.
  • the radially extending passage of the banjo member 36 is provided with an internal screw-thread which mates with an external screw-thread provided on an end part of a clamp member 38, the clamp member 38 being provided with an axially extending passage through which the fuel pipe 30 extends, an end part of the passage of the clamp member 38 being shaped to engage the enlarged head 28 of the fuel pipe 30 to ensure that the head 28 is clamped in sealing engagement with the seating 24.
  • the clamp member 38 extends through an opening provided in the cam box cover 22, the part of the clamp member 38 exposed from the cam box cover 22 being shaped to receive an appropriate tool to permit rotation of the clamp member 38 during assembly.
  • An annular chamber 40 a is defined between the injector 12, banjo member 36 and clamp member 38, the annular chamber 40 a communicating with a return fuel passage 40 provided in the clamp member 38.
  • the annular chamber 40 a receives fuel from a backleak passage 12 a of the injector 12.
  • the passage 40 further communicates with an annular chamber 40 b defined between the clamp member 38 and cam box cover 22, the annular chamber 40 b communicating through a drilling 42 with a backleak channel 44 provided in the cam box cover 22 which communicates, in use, with an appropriate low pressure fuel reservoir.
  • the backleak channel 44 communicates with a plurality of drillings 42 thus permitting each injector to be connected to the backleak channel 44.
  • appropriate O-ring seals are located between the injector 12, banjo member 36, connector member 38 and cam box cover 22 to reduce the leakage of fuel from the fuel system, in use.
  • the threaded connection between the clamp member 38 and banjo member 36 is slightly loose, thus permitting the clamp member 38 to occupy a position which is slightly offset from the axis of the radially extending passage of the banjo member 36.
  • the use of the enlarged, dome-like head 28 and frustoconical seating 24 is a self-centring arrangement thus assisting in assembly.
  • the use of a high pressure fuel pipe 30 which is bent through 180°, the ends of the high pressure fuel pipe 30 being substantially parallel to one another is advantageous in that assembly is simplified as an increased amount of slack is available in the fuel pipe 30 resulting in the clamp member 38 being more manoeuvrable during assembly.
  • An additional advantage of this arrangement is that the use of the banjo member 36 and clamp member 38 to secure the high pressure fuel pipe 30 to the injector 12 avoids the application of a side load to the injector, and instead a compressive load is applied across the diameter of the injector 12.
  • a further advantage of this arrangement is that the provision of a return fuel passage to the backleak channel can be achieved in a relatively simple and convenient manner.
  • FIG. 2 The arrangement illustrated in Figure 2 is similar to that of Figure 1 but differs therefrom in that the banjo member 36 is not used, and instead the injector 12 is provided with an externally screw-threaded, radially extending projection 46 with which an internally screw-threaded part of the clamp member 38 is engageable to clamp the head 28 of the fuel pipe 30 against a seating 24 provided at an end of the projection 46.
  • the projection 46 is of increased axial length, the projection 46 extending through the cam box cover 22 and incorporating the passage 40 which communicates directly with the backleak channel 44.
  • the clamp member 38 does not contain a low pressure backleak passage, and rather is used simply to clamp the enlarged head of the fuel pipe 30 to the seating 24.
  • the clamp member 38 of the Figure 3 arrangement is provided with an externally screw-threaded region which is received within an internally screw-threaded part of the projection 46.
  • Figure 4 is also similar to that of Figure 2, the projection 46 being of increased axial length, but being insufficient to extend through the cam box cover 22.
  • the projection 46 is provided with an externally screw-threaded part which is engaged by an internally screw-threaded part of the clamp member 38.
  • the injector is of relatively short axial length as the high pressure connection to the injector is achieved by means of the lateral clamping load applied by the clamping member, and a return fuel passage to the backleak channel is achieved in a simple and convenient manner.
  • the clamp member does not carry fuel under high pressure, but rather applies a clamping load to form a seal between the high pressure pipe and the injector.
  • the arrangement illustrated in Figure 5 differs from those described hereinbefore in that the injector 12 extends through the cam box cover 22. As the upper part of the injector 12 is exposed through the cam box cover 22, the electrical connections can be made directly to the injector 12 thus the provision of a separate socket 20 can be avoided. Further, as the injector 12 extends through the cam box cover 22, the backleak connection between the injector 12 and backleak connector channel 44 can be direct, thus no flow channel for backleak fuel is provided in the high pressure fuel clamp member 38.
  • the clamp member 38 includes an externally screw-threaded region which is received within an internally screw-threaded bore which is orientated at approximately 45° to the axis of the injector 12 and which communicates with the high pressure fuel passage 26 of the injector 12.
  • the connection of the high pressure fuel pipe 30 to the common rail 32 is similarly orientated.
  • the backleak flow channel 44 is not provided in the cam box cover 22 but rather is provided in a wall of the common rail 32. This permits recovery of heat from the fuel escaping from the injector, thus improving the efficiency of the fuel system and reducing the temperature of the fuel returning to the fuel tank.
  • a backleak connector line 48 is provided to permit communication between the backleak passage of the injector 12 and the channel 44.
  • the backleak channel 44 is provided in the cam box cover, it will be appreciated that the channel may be provided in another part of the wall of the engine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP98309693A 1997-12-09 1998-11-25 Kraftstoffanlage Withdrawn EP0922852A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9726090 1997-12-09
GBGB9726090.5A GB9726090D0 (en) 1997-12-09 1997-12-09 Fuel system

Publications (2)

Publication Number Publication Date
EP0922852A2 true EP0922852A2 (de) 1999-06-16
EP0922852A3 EP0922852A3 (de) 2000-06-07

Family

ID=10823384

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98309693A Withdrawn EP0922852A3 (de) 1997-12-09 1998-11-25 Kraftstoffanlage

Country Status (2)

Country Link
EP (1) EP0922852A3 (de)
GB (1) GB9726090D0 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009020867A1 (de) * 2009-05-12 2010-11-18 Bayerische Motoren Werke Aktiengesellschaft Brennkraftmaschine mit einem Kraftstoffinjektor
US20160319786A1 (en) * 2013-12-13 2016-11-03 Volvo Truck Corporation Cover of an internal combustion engine assembly having a common rail, engine assembly and automotive vehicle including such a cover
EP3388661A1 (de) * 2017-04-13 2018-10-17 RENAULT s.a.s. Deckel für kraftstoffeinfüllstutzen mit kraftstoffrücklauf

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845748A (en) 1972-09-29 1974-11-05 Mack Trucks Fuel injection nozzle holder installation
US5365907A (en) 1992-11-21 1994-11-22 Mercedes-Benz Ag Cylinder head for an internal combustion engine with fuel injection
EP0627553A1 (de) 1993-06-03 1994-12-07 Adam Opel Ag Haltevorrichtung für ein Kraftstoffeinspritzventil eines Dieselmotors
US5419298A (en) 1991-11-21 1995-05-30 Klockner-Humboldt-Deutz Ag Internal combustion engine
EP0754854A2 (de) 1995-07-21 1997-01-22 Man Nutzfahrzeuge Ag Einspritzventil für luftverdichtende Brennkraftmaschinen
GB2314123A (en) 1996-06-14 1997-12-17 Bosch Gmbh Robert Fuel supply device for a fuel injection valve for an i.c. engines
EP0836003A1 (de) 1996-10-11 1998-04-15 IVECO FIAT S.p.A. Kraftstoffeinspritzventil für eine Brennkraftmaschine und Brennkraftmaschine mit einem solchem Kraftstoffeinspritzventil

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB925937A (en) * 1959-06-05 1963-05-15 Tatra Np Improvements in and relating to fuel injection arrangements for compression-ignitionengines
JPS61585U (ja) * 1984-06-07 1986-01-06 臼井国際産業株式会社 高圧燃料噴射管の接続頭部構造
JPH0286953A (ja) * 1988-09-21 1990-03-27 Kanesaka Gijutsu Kenkyusho:Kk 燃料噴射弁
DE19608572A1 (de) * 1996-03-06 1997-09-11 Bosch Gmbh Robert Kraftstoffzuleitungseinrichtung

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845748A (en) 1972-09-29 1974-11-05 Mack Trucks Fuel injection nozzle holder installation
US5419298A (en) 1991-11-21 1995-05-30 Klockner-Humboldt-Deutz Ag Internal combustion engine
US5365907A (en) 1992-11-21 1994-11-22 Mercedes-Benz Ag Cylinder head for an internal combustion engine with fuel injection
EP0627553A1 (de) 1993-06-03 1994-12-07 Adam Opel Ag Haltevorrichtung für ein Kraftstoffeinspritzventil eines Dieselmotors
EP0754854A2 (de) 1995-07-21 1997-01-22 Man Nutzfahrzeuge Ag Einspritzventil für luftverdichtende Brennkraftmaschinen
GB2314123A (en) 1996-06-14 1997-12-17 Bosch Gmbh Robert Fuel supply device for a fuel injection valve for an i.c. engines
EP0836003A1 (de) 1996-10-11 1998-04-15 IVECO FIAT S.p.A. Kraftstoffeinspritzventil für eine Brennkraftmaschine und Brennkraftmaschine mit einem solchem Kraftstoffeinspritzventil

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009020867A1 (de) * 2009-05-12 2010-11-18 Bayerische Motoren Werke Aktiengesellschaft Brennkraftmaschine mit einem Kraftstoffinjektor
DE102009020867B4 (de) 2009-05-12 2022-01-27 Bayerische Motoren Werke Aktiengesellschaft Brennkraftmaschine mit einem Kraftstoffinjektor
US20160319786A1 (en) * 2013-12-13 2016-11-03 Volvo Truck Corporation Cover of an internal combustion engine assembly having a common rail, engine assembly and automotive vehicle including such a cover
US10119508B2 (en) * 2013-12-13 2018-11-06 Volvo Truck Corporation Cover of an internal combustion engine assembly having a common rail, engine assembly and automotive vehicle including such a cover
EP3388661A1 (de) * 2017-04-13 2018-10-17 RENAULT s.a.s. Deckel für kraftstoffeinfüllstutzen mit kraftstoffrücklauf
FR3065262A1 (fr) * 2017-04-13 2018-10-19 Renault S.A.S Couvercle de rampe de carburant avec retour de carburant

Also Published As

Publication number Publication date
EP0922852A3 (de) 2000-06-07
GB9726090D0 (en) 1998-02-11

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