US3910503A - Fuel injection nozzles - Google Patents

Fuel injection nozzles Download PDF

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Publication number
US3910503A
US3910503A US466231A US46623174A US3910503A US 3910503 A US3910503 A US 3910503A US 466231 A US466231 A US 466231A US 46623174 A US46623174 A US 46623174A US 3910503 A US3910503 A US 3910503A
Authority
US
United States
Prior art keywords
pressure
reducing valve
chamber
nozzle
valve
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.)
Expired - Lifetime
Application number
US466231A
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English (en)
Inventor
Stanley Frederick Barber
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.)
CAV Ltd
Original Assignee
CAV 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 CAV Ltd filed Critical CAV Ltd
Application granted granted Critical
Publication of US3910503A publication Critical patent/US3910503A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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

  • a fuel injection nozzle comprises a valve member which co-operates with the seating to control the flow of fuel through an orifice from an inlet.
  • Resilient means is provided to urge the valve member into contact with the seating, and a non-return valve is provided so that fuel from the inlet can be applied to a surface of the valve member to assist the resilient means in maintaining the valve member in contact with the seating.
  • the pressure which is applied to the valve member by way of the valve is controlled by the valve so that it is a-proportion of the pressure at the inlet.
  • This invention relates to fuel injection nozzles of the kind comprising a valve member which co-operates with a seating to control the flow of fuel through an orifice from an inlet,'resilient means acting on the valve member to urge it into contact with the seating, said valve member having a surface against which fuel under pressure from the inlet acts to lift the valve member from the seating against theaction of the resilient means and thereby to permit flow of file] through said orifice from "the inlet.
  • the object o'fthe pre's ent invention is to provide such a nozzle in a simple and convenient form.
  • a fuel injection nozzle of the kind specifiedis characterised'bylthe provision of a non-return valvethro ugh whieh fuel from said inlet can pass to act on a further surface on said valve member, the force developed on said valve member-as a result of the fuel under pressure acting on said member, acting to assist the action of said resilient means, said non return valve acting toregulate the pressure acting on said further surface.
  • a nozzle body to which is secured by means of a cap nut 11, a nozzle head 12.
  • a nozzle head Formed in the nozzle head is a bore 13 and slidable within the bore is an injection valve member 14 of stepped form.
  • the narrower portion of the valve member is shaped to co-operate with a seating defined at the end of the bore 13 and downstream of the seating the bore communicates with a drilling or drillings which constitute orifices through which liquid fuel in use, flows to a combustion chamber of an associated engine.
  • a pressure actuated surface is defined against which liquid fuel under pressure from an inlet 15 can act to lift the valve member away from the seating.
  • valve member 16 The movement of the valve member away from the seating is opposed by the action of a coiled compression spring 16 one end of which is mounted on an abutment 17a positioned on an extension of the valve member 14.
  • the spring 16 is accommodated within an axially extending chamber 17 formed in the nozzle body.
  • the other end of the spring 16 is engaged about a spring abutment 18 in which is formed a central drilling 19.
  • the abutment 18 is maintained in position against a step defined in the wall of the bore 17 by means of a valve housing 20 which is in screw thread engagement with the nozzle body 10.
  • the valve housing 20 has an axially extending bore which provides support for the stem 21 of a pressurereducing non-return valve, the valve stem at its end nearer the valve member 14, mounting a head 22 and at its other end, a spring abutment 23 between which and an adjacent surface on the housing 20, is interposed a coiled compression spring 24.
  • valve housing 20 beneath the valve head 22 defines a recess 25 which communicates with the fuel inlet 15. Moreover, the valve head 22 co-operates with a seating defined about the recess and it is urged into contact with this seating by means of the spring 24.
  • the non-return valve when subjected to the pressure of fuel delivered to the inlet 15, lifts against the action of its spring 24 to allow fuel under pressure to flow into the bore 17.
  • the fuel under pressure within the bore 17 acts on the end surface of the valve member 14 to assist the action of the spring 16 in 'urging'thevalve member 14 into contactwith its seating.
  • the force developed by the pressure of fuel acting on the end surface of the valve me mb er'l4, together with the force developed by the spring'l6 must not exceed the force exerted on the valve member 14 inthe direction to lift the valve member 14 from its seating.
  • the difference in the peak pressure supplied to the inlet '15 and the pressure within that portion of the bore 17 which contains the spring 16, depends upon the'design of the non-return valve, and particularly the dimensions 'of the head 22, and the valve stem 21. It will be noted that the end of the valve stem 21 remote from the head is exposed to a drain 26, and therefore the ratio of the peak injection pressure to the pressure within the bore 17 depends upon the effective area of the valve head exposed to the pressure within the bore 17 and the area of the underside of the valve head which is exposed to the peak injection pressure.
  • the non-return valve acts to regulate the pressure in the bore 17.
  • the spring 24 is omitted together with the abutment 18.
  • the valve head 22 is shaped to define an abutment for the spring 16.
  • the volume of the bore 17 accommodating the spring 16 must be carefully chosen so that the displacement of the valve member 14 into the bore as it lifts from its seating, does not result in any substantial increase in the pressure within the bore 17.
  • a fuel injection nozzle including a body having a fuel inlet and an outlet, an injection valve element movable in the body to control flow through the outlet, spring means biasing said valve element toward a closed position with respect to said outlet, said valve element having a pressure-actuating surface portion facing the outlet and exposed to inlet pressure whereby inlet pressure is effective to counter the closing effect of said spring means, and means including a pressurereducing valve responsive to inlet pressure and acting on the injection valve element in a closing direction to augment the closing bias of the spring means.
  • a nozzle as claimed in claim 1 in which said pressure-reducing valve has an outlet communicating with a further surface to urge said injection valve element in a closing direction and whereby the pressure acting on said further surface is a proportion of the pressure at said inlet.
  • a nozzle as claimed in claim 2 in which said pressure-reducing valve includes a head and a stem connected to the head, the end of said stem remote from the head being exposed to a low pressure, said head being shaped for co-operation with a seating, the face .3 of said head remote from the stem being subjected to the pressure acting on said further surface and acting to close the head onto the seating, and the opposite face of the head being subjected to the pressure of fuel at said inlet.
  • a nozzle as claimed in claim 3 including further resilient means acting to urge said head into contact with the seating.
  • a nozzle as defined in claim 2 wherein the injection valve element and the pressure-reducing valve are manually slidable in the body, the body having a chamber between said injection valve element and pressurereducing valve, the outlet of the pressure-reducing valve communicating with said chamber.
  • a nozzle as defined in claim 2 wherein the injection valve element and the pressure-reducing valve are manually slidable in the body, the body having a chamber between said injection valve element and pressurereducing valve, the outlet of the pressure-reducing valve communicating with said chamber, said spring means comprising a compression spring located in said chamber between said valves, said spring means reacting against the injection element in a closing direction 5 outwardly with respect to the body, the pressurereducing valve being closable by movement in the opposite direction.
  • a nozzle as .defined in claim 2 wherein the injection valve element and the pressure-reducing valve are manually slidable in the body, the body having a chamber between said injection valve element and pressurereducing valve, the outlet of the pressure-reducing valve communicating with said chamber, said spring means comprising a compression spring located in said chamber between said valves, said spring means reacting against the injection element in a closing direction outwardly with respect to the body, the pressurereducing valve being closable by movement in the opposite direction, inlet pressure being directed against pressure-reducing valve in an opening direction which tends to move it inwardly with respect to the chamber.
  • a nozzle as defined in claim 6' including additional spring means reacting against said pressure-reducing valve in a closing direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
US466231A 1973-05-12 1974-05-02 Fuel injection nozzles Expired - Lifetime US3910503A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2271873A GB1472401A (en) 1973-05-12 1973-05-12 Fuel injection nozzles

Publications (1)

Publication Number Publication Date
US3910503A true US3910503A (en) 1975-10-07

Family

ID=10183987

Family Applications (1)

Application Number Title Priority Date Filing Date
US466231A Expired - Lifetime US3910503A (en) 1973-05-12 1974-05-02 Fuel injection nozzles

Country Status (6)

Country Link
US (1) US3910503A (ja)
JP (1) JPS5014921A (ja)
DE (1) DE2422736A1 (ja)
FR (1) FR2228955B1 (ja)
GB (1) GB1472401A (ja)
IT (1) IT1011421B (ja)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4186884A (en) * 1978-01-11 1980-02-05 Lucas Industries Limited Liquid fuel injection nozzles
US4499871A (en) * 1979-06-12 1985-02-19 M.A.N. Maschinenfabrik Ausburg-Nurnberg AG Fuel injection method and arrangement for direct-injection internal combustion engines
US4684067A (en) * 1986-03-21 1987-08-04 General Motors Corporation Two-stage, hydraulic-assisted fuel injection nozzle
US4852808A (en) * 1986-12-05 1989-08-01 Nippondenso Co., Ltd. Fuel injection valve used in fuel injection apparatus for internal combustion engine
US5429309A (en) * 1994-05-06 1995-07-04 Caterpillar Inc. Fuel injector having trapped fluid volume means for assisting check valve closure
US5722600A (en) * 1995-07-14 1998-03-03 Isuzu Motors Limited Fuel injection device for internal combustion engines
CN106870345A (zh) * 2017-02-16 2017-06-20 于浩 一种柱塞泵的手动调压装置

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52135724U (ja) * 1976-04-12 1977-10-15
JPS5444902A (en) * 1977-09-14 1979-04-09 Daburiyuu Aaru Gureesu Kk Support for photosensitive resin printing plate
US4261513A (en) * 1978-09-26 1981-04-14 Lucas Industries Limited Fuel injection nozzles
US4379524A (en) * 1980-05-16 1983-04-12 Lucas Industries Limited Fuel injection nozzles
JPS5845093A (ja) * 1981-09-11 1983-03-16 Kobe Steel Ltd 平版用印刷基板
JPS5848980U (ja) * 1981-09-29 1983-04-02 いすゞ自動車株式会社 ホ−ル型燃料噴射ノズル
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
JPH07109182B2 (ja) * 1986-11-11 1995-11-22 日本電装株式会社 内燃機関用燃料噴射装置
JPH0286953A (ja) * 1988-09-21 1990-03-27 Kanesaka Gijutsu Kenkyusho:Kk 燃料噴射弁

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1834061A (en) * 1930-04-30 1931-12-01 Westinghouse Electric & Mfg Co Fuel nozzle
US2279010A (en) * 1941-08-19 1942-04-07 American Locomotive Co Fuel injection apparatus
US2788246A (en) * 1956-06-27 1957-04-09 Alco Products Inc Fuel injectors
US3363844A (en) * 1966-01-13 1968-01-16 Cav Ltd Liquid fuel injection nozzle units
US3464627A (en) * 1966-06-21 1969-09-02 Sopromi Soc Proc Modern Inject Electromagnetic fuel-injection valve
US3481542A (en) * 1967-03-22 1969-12-02 Sopromi Soc Proc Modern Inject Safety device for electromagnetic fuel-injection spray nozzles for internal combustion engines
US3640466A (en) * 1968-11-05 1972-02-08 Sulzer Ag Fuel injection system for an internal combustion piston engine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR958772A (ja) * 1950-03-17
GB1412413A (en) * 1971-10-28 1975-11-05 Cav Ltd Liquid fuel injection systems

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1834061A (en) * 1930-04-30 1931-12-01 Westinghouse Electric & Mfg Co Fuel nozzle
US2279010A (en) * 1941-08-19 1942-04-07 American Locomotive Co Fuel injection apparatus
US2788246A (en) * 1956-06-27 1957-04-09 Alco Products Inc Fuel injectors
US3363844A (en) * 1966-01-13 1968-01-16 Cav Ltd Liquid fuel injection nozzle units
US3464627A (en) * 1966-06-21 1969-09-02 Sopromi Soc Proc Modern Inject Electromagnetic fuel-injection valve
US3481542A (en) * 1967-03-22 1969-12-02 Sopromi Soc Proc Modern Inject Safety device for electromagnetic fuel-injection spray nozzles for internal combustion engines
US3640466A (en) * 1968-11-05 1972-02-08 Sulzer Ag Fuel injection system for an internal combustion piston engine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4186884A (en) * 1978-01-11 1980-02-05 Lucas Industries Limited Liquid fuel injection nozzles
US4499871A (en) * 1979-06-12 1985-02-19 M.A.N. Maschinenfabrik Ausburg-Nurnberg AG Fuel injection method and arrangement for direct-injection internal combustion engines
US4684067A (en) * 1986-03-21 1987-08-04 General Motors Corporation Two-stage, hydraulic-assisted fuel injection nozzle
US4852808A (en) * 1986-12-05 1989-08-01 Nippondenso Co., Ltd. Fuel injection valve used in fuel injection apparatus for internal combustion engine
US5429309A (en) * 1994-05-06 1995-07-04 Caterpillar Inc. Fuel injector having trapped fluid volume means for assisting check valve closure
US5722600A (en) * 1995-07-14 1998-03-03 Isuzu Motors Limited Fuel injection device for internal combustion engines
CN106870345A (zh) * 2017-02-16 2017-06-20 于浩 一种柱塞泵的手动调压装置
CN106870345B (zh) * 2017-02-16 2019-04-02 东营盛昶石油机械有限公司 一种柱塞泵的手动调压装置

Also Published As

Publication number Publication date
JPS5014921A (ja) 1975-02-17
GB1472401A (en) 1977-05-04
FR2228955A1 (ja) 1974-12-06
FR2228955B1 (ja) 1979-05-25
IT1011421B (it) 1977-01-20
DE2422736A1 (de) 1974-12-05

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