US3831863A - Fuel injection nozzles - Google Patents

Fuel injection nozzles Download PDF

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Publication number
US3831863A
US3831863A US00323529A US32352973A US3831863A US 3831863 A US3831863 A US 3831863A US 00323529 A US00323529 A US 00323529A US 32352973 A US32352973 A US 32352973A US 3831863 A US3831863 A US 3831863A
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US
United States
Prior art keywords
valve member
pressure
fuel
seating
spring
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
US00323529A
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English (en)
Inventor
I Fenne
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 US3831863A publication Critical patent/US3831863A/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

  • the area of the d 33 9O 9 6 push rod exposed to the fluid pressure being less than 1 o are that of the valve member which is exposed to the fluid pressure whereby the valve member will be lifted from [56] u lTE g s qg g gs gg r Ts its seating to allow flow through said outlet.
  • This invention relates to fuel injection nozzles for use with compression ignition engines, the nozzles being of the kind comprising a nozzle body having a nozzle head at one end thereof, a valve member slidable within the head and movable under the action of fuel under pressure away from a seating to allow flow of fuel from an inlet through an outlet, and a spring for effecting movement of the valve member into contact with the seating.
  • the object of the invention is to provide such a nozzle in a simple and convenient form.
  • valve member or an elongated member acting intermediate the valve member and the spring
  • a fuel injection nozzle in accordance I with the invention is divided to define a space to which fuel under pres-
  • An example of a fuel injection nozzle in accordance I with the invention will now be described with reference to the accompanying drawing which shows a sectional side elevation of the nozzle.
  • a nozzle body which at one end mounts a nozzel head 11, the head being retained relative to the body by means of a retaining member 12 which is in screw-thread engagement with the body.
  • a bore 13 Formed in the nozzlehead 11 is a bore 13 in which is slidably mounted a valve member 14.
  • the end of the bore defines a seating for the valve .member 14 and when the valve member is moved away from the seating, fuel can flow from the bore through an outlet 15 into a combustion space of an associated engine.
  • the bore is enlarged to provide an annular chamber 16 and this communicates by way of a passage 17 continuing through the body 10, with an inlet 18.
  • the inlet is connected to a pump 19 which is' driven in timed relationship with the associated engine.
  • a drilling 20 having a diameter smaller than that of the bore 13 and located within the drilling is a divided elongated push member 21a, 21b.
  • the end of the portion 21a of the push member is of reduced diameter and the adjacent end of the other portion of the push member is of spherical form.
  • annular space 22 there is thus defined with the wall of the drilling 20 an annular space 22 to which fuel under pressure may be supplied from the inlet 18 by way of a spring-loaded non-return valve 23.
  • the upper portion 21a of the push member mounts an abutment 24 for a coiled compression spring 25.
  • the compression spring is located within a cap member 26 which is in screw-thread engagement with the body.
  • Extending within the spring is a stop member 27 which can co-operate with the spring abutment 24 to limit the extent by which the spring can be compressed.
  • the chamber containing the spring communicates with either the atmosphere or a source of fuel at a low pressure by way of a drilling formed in the stop member 27, and also communicating with the space containing the spring is the end of the bore 13 remote from the outlet 15.
  • the volume of the space 22 must be sufficient to prevent an excessive rise in pressure when the portion 21b of the push member is moved by the action of valve member 14 and small enough to allow the pressure in space 22 to drop owing to leakage when the engine speed is lowered.
  • the action of the one way valve 23 is to trap fuel in the space 22 at the peak pressure occuring during the delivery of fuel by the pump.
  • the nozzle described possesses the important feature that the nozzle opening pressure is a function of the peak inlet pressure as also is the closing pressure when the abutment is in contact with the stop, and this has the effect of increasing the effective rate of injection of fuel at high speeds.
  • the moving mass of the construction is less than that of a conventional injector.
  • a push member is interposed between the valve member and the spring.
  • the push member is dispensed with and the valve member is made of increased length.
  • the valve member itself would be divided to define the aforementioned space, it being appreicated that it would be necessary to provide a step on the valve member to produce the differential force required to effect opening of the valve member.
  • a fuel injection nozzle for use with compression ignition engines, the nozzle comprising a nozzle body having a nozzle head at one end thereof, an inlet in the body, a valve member slidable within the head; a seating defined in the head, a spring for effecting movement of the valve member onto the seating, the valve member being lifted from the seating by fuel under pressure supplied to the inlet and acting on the end of the valve member adjacent the seating, connection means disposed intermediate the valve member and spring, said connection means being divided to define a space, passage means through which fuel under pressure can be supplied from said inlet to said space, a non-return valve disposed in said passage means, the arrangement being such that when the pressure of fuel supplied to the inlet is low the nozzle operates in the conventional manner with the spring being operative to close the valve member onto the seating but as the pressure of fuel increases a point is reached at which the pressure within the space compresses the spring its maximum extent whereafter the valve member is closed onto the seating by the action of the pressure of fuel within the space, the area of the connection
  • a nozzle as claimed in claim 1 including means limiting the deflection of said spring.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
US00323529A 1972-01-15 1973-01-15 Fuel injection nozzles Expired - Lifetime US3831863A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB201872A GB1420931A (en) 1972-01-15 1972-01-15 Fuel injection nozzles

Publications (1)

Publication Number Publication Date
US3831863A true US3831863A (en) 1974-08-27

Family

ID=9732147

Family Applications (1)

Application Number Title Priority Date Filing Date
US00323529A Expired - Lifetime US3831863A (en) 1972-01-15 1973-01-15 Fuel injection nozzles

Country Status (6)

Country Link
US (1) US3831863A (pt)
JP (1) JPS5730977B2 (pt)
DE (1) DE2301744A1 (pt)
FR (1) FR2168349B1 (pt)
GB (1) GB1420931A (pt)
IT (1) IT976855B (pt)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952711A (en) * 1975-03-04 1976-04-27 Ambac Industries, Inc. Diesel injection nozzle with independent opening and closing control
US4186884A (en) * 1978-01-11 1980-02-05 Lucas Industries Limited Liquid fuel injection nozzles
US4215821A (en) * 1977-03-16 1980-08-05 Robert Bosch Gmbh Fuel injection nozzle
US4225088A (en) * 1977-03-16 1980-09-30 Robert Bosch Gmbh Fuel injection nozzle
US4804143A (en) * 1984-04-05 1989-02-14 Lucas Industries Public Limited Company Fuel injection nozzle unit
US5472142A (en) * 1992-08-11 1995-12-05 Nippondenso Co., Ltd. Accumulator fuel injection apparatus
US5577667A (en) * 1992-12-23 1996-11-26 Ganser-Hydromag Fuel injection valve
US6113012A (en) * 1998-06-25 2000-09-05 Caterpillar Inc. Rate shaped fuel injector with internal dual flow rate office
US20060283984A1 (en) * 2005-06-16 2006-12-21 Olaf Enke Dampening stop pin

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS592985U (ja) * 1982-06-30 1984-01-10 いすゞ自動車株式会社 デイ−ゼル機関の燃料噴射装置
JPS59186480U (ja) * 1983-05-30 1984-12-11 株式会社ボッシュオートモーティブ　システム 燃料噴射ノズル装置
US4566635A (en) * 1983-08-10 1986-01-28 Robert Bosch Gmbh Fuel injection nozzle for internal combustion engines
JPH0256354U (pt) * 1988-10-18 1990-04-24

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738576A (en) * 1971-04-21 1973-06-12 Physics Int Co Injection nozzle for direct injection engine
US3747857A (en) * 1970-06-24 1973-07-24 Cav Ltd Fuel injection systems

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1314017A (en) * 1969-07-07 1973-04-18 Cav Ltd Fuel injection nozzles

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3747857A (en) * 1970-06-24 1973-07-24 Cav Ltd Fuel injection systems
US3738576A (en) * 1971-04-21 1973-06-12 Physics Int Co Injection nozzle for direct injection engine

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952711A (en) * 1975-03-04 1976-04-27 Ambac Industries, Inc. Diesel injection nozzle with independent opening and closing control
US4215821A (en) * 1977-03-16 1980-08-05 Robert Bosch Gmbh Fuel injection nozzle
US4225088A (en) * 1977-03-16 1980-09-30 Robert Bosch Gmbh Fuel injection nozzle
US4186884A (en) * 1978-01-11 1980-02-05 Lucas Industries Limited Liquid fuel injection nozzles
US4804143A (en) * 1984-04-05 1989-02-14 Lucas Industries Public Limited Company Fuel injection nozzle unit
US5472142A (en) * 1992-08-11 1995-12-05 Nippondenso Co., Ltd. Accumulator fuel injection apparatus
US5577667A (en) * 1992-12-23 1996-11-26 Ganser-Hydromag Fuel injection valve
US6113012A (en) * 1998-06-25 2000-09-05 Caterpillar Inc. Rate shaped fuel injector with internal dual flow rate office
US20060283984A1 (en) * 2005-06-16 2006-12-21 Olaf Enke Dampening stop pin
US7900604B2 (en) 2005-06-16 2011-03-08 Siemens Diesel Systems Technology Dampening stop pin

Also Published As

Publication number Publication date
DE2301744A1 (de) 1973-07-19
GB1420931A (en) 1976-01-14
JPS5730977B2 (pt) 1982-07-01
JPS4880920A (pt) 1973-10-30
IT976855B (it) 1974-09-10
FR2168349A1 (pt) 1973-08-31
FR2168349B1 (pt) 1976-04-30

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