EP0274260A1 - Injecteur de combustible - Google Patents

Injecteur de combustible Download PDF

Info

Publication number
EP0274260A1
EP0274260A1 EP87311233A EP87311233A EP0274260A1 EP 0274260 A1 EP0274260 A1 EP 0274260A1 EP 87311233 A EP87311233 A EP 87311233A EP 87311233 A EP87311233 A EP 87311233A EP 0274260 A1 EP0274260 A1 EP 0274260A1
Authority
EP
European Patent Office
Prior art keywords
piston
bore
insert
fuel
valve member
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.)
Pending
Application number
EP87311233A
Other languages
German (de)
English (en)
Inventor
David John Gaskell
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 EP0274260A1 publication Critical patent/EP0274260A1/fr
Pending 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift

Definitions

  • This invention relates to a fuel injection nozzle for supplying fuel to an internal combustion engine the nozzle being of the kind comprising a nozzle body, a bore formed in the body, a seating defined at one end of the bore, a valve member slidable in the bore and shaped at one end for co-operation with the seating, passage means through which fuel under pressure from an inlet can be applied against a step defined on the valve member to lift the valve member from the seating thereby to allow fuel flow through an outlet, resilient means located in a chamber in the body, one end of said resilient means being operatively connected to the other end of the valve member, the opposite end of the resilient means being operatively connected to a piston which is subject to said fuel pressure and which when the fuel pressure attains a predetermined value, moves through a predetermined distance from an initial position to increase the force exerted by the resilient means on the valve member.
  • the object of the invention is to provide a fuel injection nozzle of the kind specified in a simple and convenient form.
  • said piston in a fuel injection nozzle of the kind specified said piston is located in a further bore formed in an insert which is adjustably mounted in the body whereby the initial position of the piston can be adjusted, said insert carrying an adjustable stop to enable adjustment of said predetermined distance to be effected.
  • the nozzle comprises a two part body 10, 11 the two parts being held in assembled relationship by means of a cap nut not shown.
  • a bore 12 Within the part 11 of the body is formed a bore 12 and at the end of the bore remote from the body part 10 there is formed a seating 13.
  • This end of the bore is also enlarged to form an enlargement 14 to which fuel under pressure can be supplied in use by way of a passage 15 which extends within the two parts of the body from a fuel inlet 16.
  • An outlet orifice 17 extends from within the seating to the exterior of the part 11 of the body and slidable within the bore 12 is a valve member 18.
  • the portion of the valve member which passes through the enlargement 14 is of reduced diameter and is also shaped at its end for co-operation with the seating.
  • the other end of the valve member is provided with a projection 19 of smaller diameter than the main portion of the valve member, the projection extending through an aperture 20 into a chamber 21 which is formed in the part 10 of the body.
  • the aperture 20 is of a larger diameter than the projection 19 but is smaller in diameter than the bore 12 so that a step is defined at the end of the bore 12, the step acting to limit the movement of the valve member away from the seating.
  • a coiled compression spring 22 one end of which engages an abutment 23 which is mounted on the projection 19.
  • the other end of the spring 22 is mounted on a further abutment 24 which is carried on the reduced end portion 25 of a piston 26 slidably mounted in a bore 27 formed in an insert 28 which is mounted in axially adjustable relationship by means of screw threads, in the part 10 of the body.
  • Extending from the bore 27 is a passage 29 which is connected to the fuel inlet 16. It will be noted that the passage 29 is of smaller diameter than the bore 27 and that the piston 26 has a tapered end so that initially only a small area of the piston 26 is exposed to the fuel pressure at the inlet, the area increasing as soon as movement of the piston occurs.
  • the chamber 21 is vented to a low pressure through an outlet 31 and in use, when fuel under pressure is supplied to the inlet, the fuel pressure acts upon the step defined on the valve member 18 and will lift the valve member away from the seating in opposition to the force exerted by the spring 22, to allow fuel flow through the outlet orifice 17.
  • the force produced by the fuel pressure acting on the piston 26 will cause movement of the piston, downwardly as shown in the drawing, into contact with the stop member 30 and in so doing the force exerted by the spring 22 on the valve member will be increased tending to cause closure of the valve member 18.
  • the movement of the piston 26 does absorb a volume of fuel delivered by the associated fuel injection pump to the fuel inlet 16 and the effect therefore is to provide for pilot injection of fuel in advance of the main quantity of fuel.
  • the initial position of the piston 26 is determined by adjustment of the insert 28 within the part 10 of the body and once the correct position has been determined, a lock nut 32 is tightened to secure the insert against movement.
  • the extent of movement of the piston is determined by adjustment of the stop member 30.
  • the stop member 30 can be replaced as shown in Figure 2, by a shim 30A the width of which can be selected, the shim being held in position by a circlip 30B within the insert 28.
  • the arrangement of the fuel inlet 16 is described in our co-pending British application 8725049 but essentially it comprises a clamp member 32A which extends around part 10 of the body and which is formed with a boss 33 which is provied with a thread through bore.
  • a clamping element in the form of a banjo bolt 34 is engaged with the boss and the inner end of the bolt is shaped to engage within a recess formed in the part 10 of the body and from the base of which extends the passage 15.
  • the banjo bolt when tightened draws the clamp member 32A into firm engagement with the opposite side of the body and of course a seal is established between the end of the banjo bolt and the recess.
  • the banjo bolt in the particular example carries a double banjo union 35 and a nut 36 is provided to tighten the union against the head of the banjo bolt.
  • One of the pipes connects to a further banjo coupling which supplies fuel to the passage 29.
  • the outlet 31 from the chamber 21 is connected in a similar fashion to a drain conduit 37, a further banjo bolt 38 being provided which is in screw thread engagement with the clamp member 32A and which carries an elastomeric sealing member for engagement with the recess in the wall of the part 11 of the body and from which the passage 31 extends to the chamber 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)
EP87311233A 1987-01-09 1987-12-21 Injecteur de combustible Pending EP0274260A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878700429A GB8700429D0 (en) 1987-01-09 1987-01-09 Fuel injection nozzle
GB8700429 1987-01-09

Publications (1)

Publication Number Publication Date
EP0274260A1 true EP0274260A1 (fr) 1988-07-13

Family

ID=10610460

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87311233A Pending EP0274260A1 (fr) 1987-01-09 1987-12-21 Injecteur de combustible

Country Status (3)

Country Link
EP (1) EP0274260A1 (fr)
JP (1) JPS63176658A (fr)
GB (1) GB8700429D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2227056A (en) * 1988-12-31 1990-07-18 Bosch Gmbh Robert I.c.engine fuel injection pump and injector
DE4041878A1 (de) * 1989-12-28 1991-07-04 Toyota Motor Co Ltd Kraftstoff-einspritzventil fuer einen dieselmotor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB448752A (en) * 1935-10-31 1936-06-15 Harry Ralph Ricardo Improvements in or relating to fuel injection apparatus for internal combustion engines of the liquid fuel injection compression ignition type
GB787635A (en) * 1953-04-16 1957-12-11 Texaco Development Corp Improvements in or relating to internal combustion engines
FR1531448A (fr) * 1967-04-14 1968-07-05 Moteur Moderne Le Injecteur de combustible de moteur à combustion interne asservi
DE3409924A1 (de) * 1983-03-31 1984-10-11 AVL Gesellschaft für Verbrennungskraftmaschinen und Messtechnik mbH, Prof. Dr.Dr.h.c. Hans List, Graz Duesenhalter fuer eine kraftstoffeinspritzduese

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB448752A (en) * 1935-10-31 1936-06-15 Harry Ralph Ricardo Improvements in or relating to fuel injection apparatus for internal combustion engines of the liquid fuel injection compression ignition type
GB787635A (en) * 1953-04-16 1957-12-11 Texaco Development Corp Improvements in or relating to internal combustion engines
FR1531448A (fr) * 1967-04-14 1968-07-05 Moteur Moderne Le Injecteur de combustible de moteur à combustion interne asservi
DE3409924A1 (de) * 1983-03-31 1984-10-11 AVL Gesellschaft für Verbrennungskraftmaschinen und Messtechnik mbH, Prof. Dr.Dr.h.c. Hans List, Graz Duesenhalter fuer eine kraftstoffeinspritzduese

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 92 (M-373)[1815], 20th April 1985; & JP-A-59 218 359 (MITSUBISHI JUKOGYO K.K.) 08-12-1984 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2227056A (en) * 1988-12-31 1990-07-18 Bosch Gmbh Robert I.c.engine fuel injection pump and injector
GB2227056B (en) * 1988-12-31 1993-03-17 Bosch Gmbh Robert Fuel injection device for internal combustion engines
DE4041878A1 (de) * 1989-12-28 1991-07-04 Toyota Motor Co Ltd Kraftstoff-einspritzventil fuer einen dieselmotor
DE4041878C2 (de) * 1989-12-28 1996-09-05 Toyota Motor Co Ltd Kraftstoff-Einspritzventil für einen Dieselmotor

Also Published As

Publication number Publication date
JPS63176658A (ja) 1988-07-20
GB8700429D0 (en) 1987-02-11

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