EP0572134A1 - Buse d'injection de combustible - Google Patents

Buse d'injection de combustible Download PDF

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Publication number
EP0572134A1
EP0572134A1 EP93303598A EP93303598A EP0572134A1 EP 0572134 A1 EP0572134 A1 EP 0572134A1 EP 93303598 A EP93303598 A EP 93303598A EP 93303598 A EP93303598 A EP 93303598A EP 0572134 A1 EP0572134 A1 EP 0572134A1
Authority
EP
European Patent Office
Prior art keywords
valve member
seating
spring
fuel
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.)
Withdrawn
Application number
EP93303598A
Other languages
German (de)
English (en)
Inventor
John William Stevens
Martin Paul Hardy
Douglas Wallace
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.)
ZF International UK Ltd
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 EP0572134A1 publication Critical patent/EP0572134A1/fr
Withdrawn legal-status Critical Current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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/083—Having two or more closing springs acting on injection-valve

Definitions

  • This invention relates to fuel injection nozzles for supplying fuel to internal combustion engines and of the kind comprising a nozzle holder to which is secured a nozzle body, the nozzle body defining a bore in which a valve member is slidable, a seating formed in the bore, the valve member being shaped for cooperation with the seating and being movable by fuel under pressure away from the seating to allow fuel flow from a fuel inlet to an outlet, a fuel supply passage formed in the holder and through which fuel flows from the fuel inlet under the control of the valve member, a chamber defined in the holder, a first spring in said chamber and acting on the valve member to bias the valve member into engagement with the seating, a second spring in said chamber, a spring abutment for said second spring, means movable with the valve member and engageable with said spring abutment after a predetermined movement of the valve member away from the seating so that the further movement of the valve member takes place against the action of both springs, and means for limiting the further movement of the valve member away from the
  • the object of the invention is to provide a fuel injection nozzle of the kind specified in a simple and convenient form.
  • the means for limiting the further movement of the valve member comprises a stop surface defined by a recess formed in the wall of said chamber, said stop surface being engageable by said spring abutment.
  • the fuel injection nozzle comprises an elongated nozzle holder 10 of cylindrical form and within which is formed a chamber 12 which opens onto an end surface 13. The opposite end of the chamber communicates with a fuel outlet 14.
  • a stepped nozzle body 15 Located against the end surface 13 is the larger end of a stepped nozzle body 15, the body being secured to the holder by means of a cap nut 16.
  • a bore 17 Formed in the nozzle body is a bore 17 in which is slidable a valve member 18.
  • an enlargement 19 which is connected by means of a passage 20 in the nozzle body and a registering passage 21 formed in the holder, with a fuel inlet 22 which in use is connected to the outlet of a high pressure fuel injection pump.
  • the valve member is shaped at its end remote from the holder to engage with a seating 23 and downstream of the seating is formed an outlet orifice 24.
  • the portion of the valve member which lies intermediate the enlargement or recess 19 is of smaller diameter than the bore so as to provide an annular clearance along which fuel can flow from the recess 19 when the valve member is lifted from its seating.
  • the valve member is provided with an extension 25 which is of reduced diameter as compared with the adjacent portion of the valve member so as to form an annular step 26. In the closed position of the valve member the step 26 lies below the adjacent end surface of the nozzle body by a predetermined distance which is labelled in Figure 2 of the drawings, h1.
  • the fuel injection nozzle also includes a pair of coiled compression springs.
  • the first spring 27 is housed in the end of the chamber 12 remote from the nozzle body and at one end it engages with the end wall of the chamber with a shim 28 being interposed therebetween. At its other end the spring engages an abutment 29 which is mounted upon one end of a push rod 30 which engages with the extension 25 of the valve member.
  • the push rod 30 extends through and is guided by the wall of an aperture in a fixed abutment 31 against which is engaged one end of the second spring 32.
  • a shim 33 is interposed between the spring and the abutment.
  • the abutment 31 is retained in position by deforming the wall of the holder, and a passage is provided to enable leakage fuel to flow to the outlet 14.
  • the spring engages a further abutment 34 which as more clearly seen in Figure 3, comprises a plate which is of generally triangular form but having its corners rounded.
  • the plate 34 is provided with a central aperture 35 which is located about the extension 25 so that the plate is laterally located by the extension.
  • the push rod 30 extends into the aperture so that it is located by the plate.
  • the rounded corners of the plate 34 extend within part cylindrical recesses 36 respectively which are formed in the wall 37 of the chamber 12.
  • the recesses define stop surfaces 39 respectively for engagement by the adjacent surfaces of the corner portions of the plate 34 and as will be observed from Figure 2, a predetermined distance labelled h2 exists between the end surface of the plate and the stop surfaces 39.
  • the full extent of the lift is determined by the engagement of the adjacent surfaces of the rounded corner portions of the plate 34 with the stop surfaces 39 and the total lift of the valve member amounts to the sum of the distances hl and h2.
  • the position of the passage 21 is carefully chosen to resist the forces which are developed on the wall of the passage when fuel under pressure is supplied to the inlet 22 and as will be seen from Figure 3 the angular spacing of the passage 21 is such that it lies intermediate a pair of adjacent recesses 36.
  • the end surface 13 of the holder also defines a pair of recesses 38 which accommodate location pegs respectively which are provided on the end surface of the nozzle body.
  • the maximum lift stop is defined by the surfaces 39 of the nozzle holder thereby eliminating the rod like stop member found in prior constructions.
  • the provisions of three stop surfaces 39 and the use of the generally triangular spring abutment allows sufficient wall thickness in the nozzle holder for the passage 21.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP93303598A 1992-05-23 1993-05-10 Buse d'injection de combustible Withdrawn EP0572134A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB929211069A GB9211069D0 (en) 1992-05-23 1992-05-23 Fuel injection nozzles
GB9211069 1992-05-23

Publications (1)

Publication Number Publication Date
EP0572134A1 true EP0572134A1 (fr) 1993-12-01

Family

ID=10715987

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93303598A Withdrawn EP0572134A1 (fr) 1992-05-23 1993-05-10 Buse d'injection de combustible

Country Status (2)

Country Link
EP (1) EP0572134A1 (fr)
GB (1) GB9211069D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5553781A (en) * 1995-01-03 1996-09-10 Servojet Products International Conversion of jerk type injector to accumulator type injector
EP0984159A2 (fr) * 1998-08-31 2000-03-08 Siemens Aktiengesellschaft Injecteur de carburant avec limitation de course

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB835712A (en) * 1956-11-16 1960-05-25 Emmerich Satzger Injection nozzle for internal-combustion engines with fuel injection
EP0360170A1 (fr) * 1988-09-19 1990-03-28 Diesel Kiki Co., Ltd. Soupape d'injection de combustible
DE4036580A1 (de) * 1990-11-16 1992-05-21 Skl Motoren Systemtech Kraftstoffeinspritzventil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB835712A (en) * 1956-11-16 1960-05-25 Emmerich Satzger Injection nozzle for internal-combustion engines with fuel injection
EP0360170A1 (fr) * 1988-09-19 1990-03-28 Diesel Kiki Co., Ltd. Soupape d'injection de combustible
DE4036580A1 (de) * 1990-11-16 1992-05-21 Skl Motoren Systemtech Kraftstoffeinspritzventil

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5553781A (en) * 1995-01-03 1996-09-10 Servojet Products International Conversion of jerk type injector to accumulator type injector
EP0984159A2 (fr) * 1998-08-31 2000-03-08 Siemens Aktiengesellschaft Injecteur de carburant avec limitation de course
EP0984159A3 (fr) * 1998-08-31 2003-01-29 Siemens Aktiengesellschaft Injecteur de carburant avec limitation de course

Also Published As

Publication number Publication date
GB9211069D0 (en) 1992-07-08

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