EP0302660A1 - Injecteur de combustible - Google Patents

Injecteur de combustible Download PDF

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Publication number
EP0302660A1
EP0302660A1 EP88306936A EP88306936A EP0302660A1 EP 0302660 A1 EP0302660 A1 EP 0302660A1 EP 88306936 A EP88306936 A EP 88306936A EP 88306936 A EP88306936 A EP 88306936A EP 0302660 A1 EP0302660 A1 EP 0302660A1
Authority
EP
European Patent Office
Prior art keywords
target
fuel
injector
air stream
air
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Withdrawn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
EP88306936A
Other languages
German (de)
English (en)
Inventor
Jeffrey Hiorns
Albert Robert Tingey
John Dillwyn Thickens
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 EP0302660A1 publication Critical patent/EP0302660A1/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Withdrawn legal-status Critical Current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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F02M69/044—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the intake conduit downstream of an air throttle valve
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0639—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature acting as a valve
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/08—Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection

Definitions

  • the invention relates to a fuel injector of the type known as a pintle, plate or disc injector in which a pencil-shaped jet of fuel is urged on to a target or break-up disc and thereby atomised into droplets which are then fed into the air stream of an internal combustion engine.
  • a fuel injector is exemplified by GB-A-2144178A.
  • the invention is based on the realisation that by the disposition of the target, the level of hydrocarbon emissions from the associated engine is reduced.
  • a fuel injector for use with an internal combustion engine, the injector including means for producing a pencil-shaped jet of liquid fuel, a target being located in the path of the jet and arranged to break up the jet into a spray of droplets for feeding into a stream of air characterised in that the target is disposed relative to the air stream such the air stream will remove droplets of fuel which would otherwise settle on the target.
  • the target is disposed such that the air stream passes over the opposite sides of the target.
  • the jet is arranged to impinge on a mesh surface of the target.
  • the injector is mounted on a wall of an inlet manifold, and the target is disposed in the air stream inlet of the manifold.
  • the target is joined to the outlet end of the injector body such that the air stream may pass over both sides of the target.
  • a pipe extends from within the outlet end of the body and the target extends across the end wall of the pipe, the side wall of the pipe having through holes, the pipe extending in use into the air stream so that air may pass over the opposite faces of the target.
  • the injector comprises a body having an inlet for the fuel and a fuel outlet orifice, valve means being located in the orifice for controlling the flow of fuel and a solenoid for controlling the valve means.
  • the injector comprises a hollow generally cylindrical stepped multi-part body 1 formed from a magnetisable material, eg, iron and defining a fuel inlet 2 at one end, (the top as shown in Figures 1 and 3) and a fuel outlet 3 at the other end.
  • a generally cylindrical flanged hollow core 4 formed from a magnetisable material extends coaxially within the body 1 and includes a passageway 5 which connects the inlet 2 with the outlet 3 of the body 1.
  • a generally cylindrical former 6 made from a synthetic resin material coaxially surrounds the core 4 about the outlet end thereof. Solenoid windings 7 are wound about the former 6 and are connected to electrical connection pins 8.
  • the body 1 Upstream of the outlet end 3 the body 1 defines an integral radially inwardly extending shoulder 9 against which a steel annulus is trapped by a steel valve seat member 11.
  • the valve seat member 11 is in the form of a disc, the diameter of which is equal to the internal diameter of the body 1.
  • the valve seat member 11 has a centrally disposed outlet orifice 12 which includes an entrance portion of truncated conical form and an exit portion of cylindrical form.
  • a valve plate 14 is located within the steel annulus 10 between the valve seat member 11 and the opposing face of the core 4.
  • the valve plate 14 is in the form of a disc made from a magnetizable material and having a plurality of apertures 15 which are arranged in a circular row about the central axis of the plate 14.
  • the upper face of the valve seat member 11 is formed with an annular rib 16 to provide a valve seating.
  • the diameter of the rib 16 is less than that of the circular row of apertures 15.
  • a further rib 17 is disposed radially outwardly from the first rib 16.
  • a compression spring 18 housed within the passageway 5 of the core 4 urges the valve plate 14 onto the valve seating rib 16.
  • a spring adjustment plug 19 is arranged, e.g., by threading, to move up and down within the core 4 to vary the strength of the spring force.
  • the bottom of the spring 18 is received within a recess 20 formed in the upper face of the valve plate 14.
  • the internal diameter of the shoulder 9 is less than that of the annulus 10 and the lower face of the shoulder 9 therefore overlaps the outer peripheral region of the valve plate 14.
  • the solenoid winding 7 is energised by electrical signals applied to the pin 8 from, e.g., an engine control unit (not shown)
  • the valve plate 14 is attracted towards the lower face of the shoulder 9.
  • the thickness of the valve plate 14 is less than the thickness of the annulus 10 by a predetermined amount to permit the valve plate 14 to move by said predetermined amount.
  • the movement of the valve plate 14 is arrested by the shoulder 9 which contacts the valve plate 14 about the periphery thereof.
  • the spring 18 returns the valve plate 14 to its closed condition in engagement with the valve seating rib 16.
  • a non-magnetic spacer 13 is present between the lower face of the shoulder 9 and the valve plate 14 and annulus 10 to prevent contact between the valve plate 14 and the shoulder 9 and to improve the "drop off" characteristic of the valve.
  • a target 22 comprising a thin disc of metal gauze extends across the end face of the pipe 21 so that in use it is coaxial with the jet of fuel from the orifice 12.
  • the target 22 is mounted in an annular recess 23 in the side wall of the pipe 21.
  • Four circular holes 24 are formed through the side wall of the pipe 21 adjacent the target 22 and the holes are separated by four spaced apart arms 25.
  • the injector is mounted on an engine so that the free end of the pipe is located within the air stream leading to the combustion chambers of an engine.
  • a pencil-like jet of fuel leaves the orifice 12 and hits the target 22.
  • the impingement of the jet of fuel onto the target 22 causes the jet of fuel to be atomized for mixing with the air stream flowing through the inlet manifold of the associated engine and across opposing faces of the target 22.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
EP88306936A 1987-08-04 1988-07-27 Injecteur de combustible Withdrawn EP0302660A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878718391A GB8718391D0 (en) 1987-08-04 1987-08-04 Fuel injector
GB8718391 1987-08-04

Publications (1)

Publication Number Publication Date
EP0302660A1 true EP0302660A1 (fr) 1989-02-08

Family

ID=10621773

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88306936A Withdrawn EP0302660A1 (fr) 1987-08-04 1988-07-27 Injecteur de combustible

Country Status (3)

Country Link
EP (1) EP0302660A1 (fr)
JP (1) JPS6456961A (fr)
GB (1) GB8718391D0 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4108279A1 (de) * 1990-03-14 1991-09-19 Aisan Ind Einspritzdueseneinrichtung mit einem unterstuetzungsluftkanal zum zerstaeuben von kraftstoff
WO1995017595A1 (fr) * 1993-12-21 1995-06-29 Robert Bosch Gmbh Filtre de diffuseur et soupape d'injection de carburant avec un filtre de diffuseur
EP0704620A2 (fr) 1994-10-01 1996-04-03 Robert Bosch Gmbh Dispositif d'injection de combustible

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3656464A (en) * 1970-03-30 1972-04-18 Fuel Injection Eng Co Fuel injection nozzle and system
DE2843534A1 (de) * 1977-10-06 1979-04-19 Aisan Ind Kraftstoffliefereinrichtung fuer eine brennkraftmaschine
GB2017208A (en) * 1978-03-22 1979-10-03 Nissan Motor Supply system for multi-cylinder engine equipped with fuelinjector
GB2144178A (en) * 1983-07-28 1985-02-27 Lucas Ind Plc I.C. engine fuel injector
EP0219746A1 (fr) * 1985-10-04 1987-04-29 Hitachi, Ltd. Système d'injection de carburant

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3656464A (en) * 1970-03-30 1972-04-18 Fuel Injection Eng Co Fuel injection nozzle and system
DE2843534A1 (de) * 1977-10-06 1979-04-19 Aisan Ind Kraftstoffliefereinrichtung fuer eine brennkraftmaschine
GB2017208A (en) * 1978-03-22 1979-10-03 Nissan Motor Supply system for multi-cylinder engine equipped with fuelinjector
GB2144178A (en) * 1983-07-28 1985-02-27 Lucas Ind Plc I.C. engine fuel injector
EP0219746A1 (fr) * 1985-10-04 1987-04-29 Hitachi, Ltd. Système d'injection de carburant

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4108279A1 (de) * 1990-03-14 1991-09-19 Aisan Ind Einspritzdueseneinrichtung mit einem unterstuetzungsluftkanal zum zerstaeuben von kraftstoff
WO1995017595A1 (fr) * 1993-12-21 1995-06-29 Robert Bosch Gmbh Filtre de diffuseur et soupape d'injection de carburant avec un filtre de diffuseur
US5707012A (en) * 1993-12-21 1998-01-13 Robert Bosch Gmbh Atomizing sieve and fuel injection valve having an atomizing sieve
CN1050649C (zh) * 1993-12-21 2000-03-22 罗伯特·博施有限公司 雾化筛网及具有雾化筛网的燃油喷射阀
EP0704620A2 (fr) 1994-10-01 1996-04-03 Robert Bosch Gmbh Dispositif d'injection de combustible
US5662277A (en) * 1994-10-01 1997-09-02 Robert Bosch Gmbh Fuel injection device

Also Published As

Publication number Publication date
GB8718391D0 (en) 1987-09-09
JPS6456961A (en) 1989-03-03

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