EP0855504A1 - Ventil - Google Patents

Ventil Download PDF

Info

Publication number
EP0855504A1
EP0855504A1 EP98300164A EP98300164A EP0855504A1 EP 0855504 A1 EP0855504 A1 EP 0855504A1 EP 98300164 A EP98300164 A EP 98300164A EP 98300164 A EP98300164 A EP 98300164A EP 0855504 A1 EP0855504 A1 EP 0855504A1
Authority
EP
European Patent Office
Prior art keywords
valve member
valve
fuel
pressure
guide 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.)
Withdrawn
Application number
EP98300164A
Other languages
English (en)
French (fr)
Inventor
George Nicholas Felton
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 EP0855504A1 publication Critical patent/EP0855504A1/de
Withdrawn legal-status Critical Current

Links

Images

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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/462—Delivery valves
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped

Definitions

  • This invention relates to a valve, and in particular to a valve suitable for use in the fuel system of an internal combustion engine.
  • valves in the outlets of a high pressure fuel pump in order to maintain a relatively high pressure in fuel lines connecting the pump to the fuel injectors of the engine, the relatively high pressure being below that required to open the injector.
  • the provision of such a valve is advantageous as less effort is required to return the line to injection pressure when a subsequent injection is required.
  • valve arrangement whereby fuel is able to flow at a restricted rate from the fuel line towards the pump in order to absorb or reduce the effect of pressure waves within the fuel line. It is an object of the invention to provide a valve of this type which is of simple construction.
  • a valve comprising a valve member slidable within a bore, the valve member and bore defining a chamber, first and second flow passages provided in the valve member, wherein the valve member is slidable between a first position in which the first and second flow passages both communicate directly with the chamber and a second position in which the direct communication between the first flow passage and the chamber is broken, and resilient means biasing the valve member towards the first position.
  • the first and second passages are conveniently interconnected by a restricted passage.
  • the accompanying drawing illustrates a so-called snubber valve 10 for use in maintaining the fuel pressure within a fuel supply line 12 for supplying fuel to a fuel pressure actuated injector 14 and for damping pressure waves within the supply line 12.
  • the snubber valve 10 is mounted in an outlet port provided in a fuel pump housing 16 having a delivery passage 18 through which fuel is supplied at high pressure, in use, when fuel injection is to occur, the passage 18 being connected to a low pressure volume when fuel injection is to be terminated, and subsequently fuel at an intermediate pressure known as transfer pressure is applied thereto.
  • the snubber valve 10 comprises a tubular guide member 20 having a central bore provided therein within which a valve member 22 is slidable.
  • a holder 24 is in screw-threaded engagement with the housing 16, the holder 24 securing the guide member 20 within the outlet port.
  • the holder 24 includes a bore of relatively large diameter which together with the guide member 20 and valve member 22 defines a spring chamber 26.
  • a spring 28 is located within the spring chamber 26, the spring 28 being engaged between a surface of the guide member 20 and an outwardly extending flange 22 a provided on the valve member 22. The spring 28 biases the valve member 22 towards the position shown in which the outwardly extending flange 22 a abuts an end of the spring chamber 26.
  • the holder 24 further includes an axially extending bore 30 which opens into the spring chamber 26, the bore 30 extending through a part of the holder 24 which forms a connector to which an end of the supply line 12 is secured, in use.
  • the valve member 22 includes a first axially extending blind bore 32 which is provided in the end of the valve member 22 which extends through the guide member 20, and a second axially extending blind bore 34 which is located in the part of the valve member 22 including the outwardly extending flange 22a.
  • a restricted passage 36 interconnects the blind ends of the blind bores 32, 34.
  • the first blind bore 32 communicates with a pair of first radially extending passages 38 which are located such that when the valve member 22 occupies the position illustrated in the accompanying drawing, the first radially extending passages 38 communicate with the spring chamber 26, the first blind bore 32 and first passages 38 defining a first flow passage.
  • a second pair of radially extending passages 40 communicate with the second blind bore 34, the second passages 40 also communicating with the spring chamber 26.
  • a second blind bore 34 and second passages 40 together define a second flow passage.
  • the outlet port of the pump housing 16 is shaped so as to include a recess 42 which is arranged to receive an end of the valve member 22, the recess 42 being arranged to permit movement of the valve member 22 away from the position shown in the accompanying drawing to a position in which the first radially extending passages 38 are obscured by the guide member 20 and no longer communicate directly with the spring chamber 26. It will be appreciated that in this position, communication between the first and second blind bores 32, 34 is only by way of the restricted passage 36. In this position, the end of the valve member 22 abuts the housing 16, thus further movement of the valve member 22 in this direction is prevented.
  • the fuel is able to flow through the first blind bore 32 and first radially extending passages 38 to the spring chamber 26. From the spring chamber 26, the fuel is able to flow through the second radially extending passages 40 to the second blind bore 34 and from there through the bore 30 to the supply line 12 and the injector 14.
  • the presence of the spring 28 ensures that the valve member 22 is maintained in the position shown.
  • the injector 14 is of the pressure actuated type, thus the application of high pressure fuel thereto causes the valve member of the injector 14 to be lifted from its seating and hence in injection commencing.
  • the delivery passage 18 is connected to a suitable low pressure drain, thus the fuel pressure within the recess 42 is reduced.
  • the pressure within the spring chamber 26 also falls.
  • the high pressure within the supply line 12 and bore 30 applies a force to the valve member 22 which is sufficiently high to overcome the effect of the spring 28, and the valve member 22 moves downwards in the orientation illustrated in the accompanying drawing until the end of the valve member 22 abuts the housing 16.
  • the downward movement of the valve member 22 results in the first radially extending passages 38 initially becoming partially obscured, and eventually totally obscured by the guide member 20 thus breaking the direct communication between the first flow passage and the spring chamber 26.
  • the pressure which must be applied to the valve member 22 in order to move the valve member 22 to the position in which the first radially extending passages 38 are obscured is dependent upon the effective area of the valve member 22 exposed to the pressure within the supply line 12 and also upon the rate of the spring 28. These parameters are selected in order to result in the pressure within the supply line 12 falling to a sufficiently low level that the injector 14 is closed, but sufficiently high that relatively little effort is needed to raise the fuel pressure within the supply line 12 to injection pressure.
  • a pressure wave may be generated in the supply line 12 which is transmitted towards the snubber valve 10. It is desirable to damp such pressure waves, and this is achieved, in part, by the provision of the restricted passage 36 which enables a restricted flow of fuel through the valve even when the first radially extending passages 38 are obscured by the guide member 20. The amplitude of a reflection of the pressure wave is therefore reduced.
  • the delivery passage 18 is supplied with fuel at transfer pressure which is substantially equal to the pressure maintained within the supply line 12.
  • the valve member 22 moves under the action of the spring 28 to the position illustrated.
  • the substantially unrestricted fuel passage through the spring chamber 26 is restored.
  • the snubber valve 10 is of relative simple construction, the valve being composed of only four parts. Further, as the snubber valve does not include a valve seat as such, manufacture of the valve is relatively simple.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP98300164A 1997-01-28 1998-01-12 Ventil Withdrawn EP0855504A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9701688.5A GB9701688D0 (en) 1997-01-28 1997-01-28 Valve
GB9701688 1997-01-28

Publications (1)

Publication Number Publication Date
EP0855504A1 true EP0855504A1 (de) 1998-07-29

Family

ID=10806680

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98300164A Withdrawn EP0855504A1 (de) 1997-01-28 1998-01-12 Ventil

Country Status (2)

Country Link
EP (1) EP0855504A1 (de)
GB (1) GB9701688D0 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004111438A1 (en) * 2003-06-17 2004-12-23 Wärtsilä Finland Oy Arrangement in fuel injection apparatus
US7712685B2 (en) 2004-01-23 2010-05-11 Wärtsilä Finland Oy Device for fuel injection rate shaping

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2300905A1 (fr) * 1975-02-14 1976-09-10 Vysoke Uceni Tech Brne Soupape de restriction de debit pour pompes d'injection de moteurs a combustion interne
JPS60249664A (ja) * 1984-05-25 1985-12-10 Kubota Ltd 燃料噴射ポンプ

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2300905A1 (fr) * 1975-02-14 1976-09-10 Vysoke Uceni Tech Brne Soupape de restriction de debit pour pompes d'injection de moteurs a combustion interne
JPS60249664A (ja) * 1984-05-25 1985-12-10 Kubota Ltd 燃料噴射ポンプ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 122 (M - 476) 7 May 1986 (1986-05-07) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004111438A1 (en) * 2003-06-17 2004-12-23 Wärtsilä Finland Oy Arrangement in fuel injection apparatus
US7370637B2 (en) 2003-06-17 2008-05-13 Wartsila Finland Oy Arrangement in fuel injection apparatus
CN100458137C (zh) * 2003-06-17 2009-02-04 瓦特西拉芬兰有限公司 燃料喷射设备中的装置
KR101101048B1 (ko) 2003-06-17 2011-12-29 바르실라 핀랜드 오이 연료분사기구에서의 장치
US7712685B2 (en) 2004-01-23 2010-05-11 Wärtsilä Finland Oy Device for fuel injection rate shaping

Also Published As

Publication number Publication date
GB9701688D0 (en) 1997-03-19

Similar Documents

Publication Publication Date Title
US5538187A (en) Fuel injection device for internal combustion engines
US6412706B1 (en) Fuel injector
EP0767304B1 (de) Einspritzventil
US5638791A (en) Common-rail fuel injection system for an engine
EP0967386A2 (de) Kraftstoffeinspritzventil
US5524826A (en) Fuel injection device for internal combustion engines
EP0385399B1 (de) Elektromagnetischer Kraftstoffinjektor eines Dieselmotors
US5669356A (en) Control valve
EP0890736B1 (de) Einspritzventil
GB2086473A (en) Fuel injection valve for compression ignition engines
GB2023727A (en) Fuel injector nozzle
JPS5851266A (ja) 圧縮点火型機関用燃料供給装置
GB2295203A (en) I.c.engine fuel injector lift damping
US6196201B1 (en) Pressure valve
EP0283154A1 (de) Brennstoffeinspritzdüse
US5660331A (en) Fuel supply system
US20030116122A1 (en) Fuel injection pump for internal combustion engines, especially diesel engines
GB2318152A (en) I.c. engine fuel-injection valve with controllable two-stage opening stroke
EP0844383B1 (de) Einspritzventil
EP0921302A2 (de) Kraftstoffeinspritzventil
EP0855504A1 (de) Ventil
US6953157B2 (en) Fuel injection device for an internal combustion engine
GB2105406A (en) Fuel injection nozzle systems for compression ignition engines
US6637409B2 (en) Fuel injection device for internal combustion engines
US6712296B1 (en) Fuel injection valve for internal combustion engines

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

AKX Designation fees paid
RBV Designated contracting states (corrected)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19990302