GB2201462A - I.C. engine fuel injection nozzle - Google Patents

I.C. engine fuel injection nozzle Download PDF

Info

Publication number
GB2201462A
GB2201462A GB08802352A GB8802352A GB2201462A GB 2201462 A GB2201462 A GB 2201462A GB 08802352 A GB08802352 A GB 08802352A GB 8802352 A GB8802352 A GB 8802352A GB 2201462 A GB2201462 A GB 2201462A
Authority
GB
United Kingdom
Prior art keywords
valve member
seating
ball
fuel
nozzle
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Withdrawn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
GB08802352A
Other versions
GB8802352D0 (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 GB8802352D0 publication Critical patent/GB8802352D0/en
Publication of GB2201462A publication Critical patent/GB2201462A/en
Withdrawn legal-status Critical Current

Links

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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/188—Spherical or partly spherical shaped valve member ends
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/06—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves being furnished at seated ends with pintle or plug shaped extensions
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for

Abstract

-A seating 12 is defined in the nozzle bore 11 and a ball 17 secured to the valve member 15 co-operates with the seating. A spring biases the ball into contact with the seating and fuel under pressure acts on the valve member to lift the ball from the seating to allow fuel flow through an outlet 13. <IMAGE>

Description

"FUEL INJECTION NOZZLE" This invention relates to a fuel injection nozzle for supplying fuel to an internal combustion engine of the compression ignition type, the nozzle being of the kind comprising a nozzle body in which is defined a bore, an annular seating defined at one end of the bore, a valve member slidable in the bore, the valve member at one end being shaped for co-operation with the seating to control the flow of fuel through an outlet downstream of the seating, the valve member being lifted from the seating by the action of fuel under pressure and being biased by resilient means into contact with the seating.
Such nozzles are well known in the art and the conventional way of forming the seating and the shaped end of the valve member is by grinding followed by a lapping operation. The seat diameters which are now in use preclude the lapping together of the seating surface and -the surface of the valve member and therefore the initial grinding operation has to be carried out to a high degree of accuracy. This is true particularly of the valve member since slight inaccuracies in the production of the seating surface of the valve member will affect the performance of the nozzle even though a proper sealing effect is obtained.
The object of the invention is to provide a fuel injection nozzle of the kind specified in a simple and convenient form.
According to the invention in a fuel injection nozzle of kind specified the shaped end of the valve member is defined by a ball which is secured to the remaining portion of the valve member.
An example of a fuel injection nozzle in accordance with the invention will now be described with reference to the. accompanying diagram which shows in sectional side elevation, a portion only of the nozzle.
Referring to the drawing the nozzle comprises a nozzle body 10 in which is defined a bore 11. At the end of the bore within the body there is defined a truncated conical seating 12 and from downstream of the.
seating, outlet orifices 13 extend to the exterior of the body the orifices conveniently being formed in a nozzle tip generally indicated at 14.
Sliding with clearance within the portion of the bore illustrated in the drawing is a valve member 15, the clearance 16 between the valve member and the wall of the bore being connected to a fuel inlet which in use is connected to the outlet of a fuel injection pump. A portion of the valve member not shown, is of enlarged diameter so as to form a sliding fit with the wall of the bore and the valve member defines a surface against which the fuel pressure can act to lift the valve member against the action of resilient means, away from the seating 12.
The valve member co-operates with the seating 12 to control the flow of fuel through the orifices 13 and in accordance with the invention the portion of the valve member which co-operates with the seating 12 is in the form of a ball 17 which can be made to a high degree of accuracy which can be secured to the valve member in a number of ways.
As illustrated, the main portion of the valve member has an extension 18 of.cylindrical form and the ball is provided with a bore 19 through which the extension 18 is passed. The ball can be a shrink fit onto the extension or alternatively and as illustrated, a weld 20 is utilised to secure the ball to the main portion of the valve member, the ball being provided with a flat engaging with the step defined between the main portion of the valve member and the extension 18. Alternatively the ball may be a press fit onto the extension.
The ball can be manufactured to a high degree of accuracy and providing it is correctly located on the main portion of the valve member, a satisfactory seal will be obtained with the sealing contact between the ball and the seating being at the correct location.
In the particular example the extension 18 extends beyond the ball and is tapered in form to provide a control tip 21 which more or less completely fills in the closed position the valve member, the so-called "sac" volume. The nozzle body is machined below the seating 12 to form a truncated conical surface 22 having a smaller included angle as compared with that of the seating and the flow of fuel to the orifices 13 is controlled by the clearance between the tip 21 and the surface 22 during the initial lift of the valve member from its seating.
It will be understood that the shape of the control tip 21 of the valve member together with the truncated conical surface 22 can be modified.

Claims (6)

1. A fuel injection nozzle for supplying fuel to an internal combustion engine of the compression ignition type, the nozzle comprising a nozzle body in which is defined a bore, an annular seating defined at one end of the bore, a valve member slidable in the bore, the valve member at one end being shaped for co-operation with the seating to control the flow of fuel through an outlet downstream of the seating, the valve member being lifted from the seating by the action of fuel under pressure and being biased by resilient means into contact with the seating, the shaped end of the valve member being defined by a ball which is secured to the remaining portion of the valve member.
2. A nozzle according to Claim 1 in which the main portion of the valve member is provided with a reduced extension which locates within a complementary bore in the ball.
3. A nozzle according to Claim 2 in which the valve member is an interference fit on the extension.
4. A nozzle according to Claim 3 in which the ball is provided with a flat for engagement with the step defined by the main portion of the valve member and the extension, the ball being welded to the main portion of the valve member.
5. A nozzle according to any one of Claims 2, 3 o4 4 in which the extension extends beyond the ball and is shaped to define a control tip which co-operates with a surface defined on the body downstream of the seating to control the flow of fuel through said outlet.
6. A fuel injection nozzle for supplying fuel to an internal combustion engine comprising the combination and arrangement of parts substantially as hereinbefore described with reference to the accompanying drawing.
GB08802352A 1987-02-28 1988-02-03 I.C. engine fuel injection nozzle Withdrawn GB2201462A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB878704746A GB8704746D0 (en) 1987-02-28 1987-02-28 Fuel injection nozzle

Publications (2)

Publication Number Publication Date
GB8802352D0 GB8802352D0 (en) 1988-03-02
GB2201462A true GB2201462A (en) 1988-09-01

Family

ID=10613117

Family Applications (2)

Application Number Title Priority Date Filing Date
GB878704746A Pending GB8704746D0 (en) 1987-02-28 1987-02-28 Fuel injection nozzle
GB08802352A Withdrawn GB2201462A (en) 1987-02-28 1988-02-03 I.C. engine fuel injection nozzle

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB878704746A Pending GB8704746D0 (en) 1987-02-28 1987-02-28 Fuel injection nozzle

Country Status (1)

Country Link
GB (2) GB8704746D0 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997020659A1 (en) * 1995-12-05 1997-06-12 Robert Bosch Gmbh Valve obturator and method and device for producing the sealing surface on such obturators
GB2320059A (en) * 1996-12-09 1998-06-10 Caterpillar Inc I.c. engine fuel injector having non-contacting valve closing orifice structure

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB258431A (en) * 1925-09-29 1926-09-23 Herbert Vincent Senior Improvements in or relating to spraying nozzles for liquids
US3836080A (en) * 1973-09-10 1974-09-17 Ambac Ind Fuel injection nozzle
US4106702A (en) * 1977-04-19 1978-08-15 Caterpillar Tractor Co. Fuel injection nozzle tip with low volume tapered sac
GB1537885A (en) * 1975-04-26 1979-01-10 Ntn Toyo Bearing Co Ltd Fuel injection valves
EP0105793A2 (en) * 1982-09-30 1984-04-18 Allied Corporation Pressure compensated fuel injector

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB258431A (en) * 1925-09-29 1926-09-23 Herbert Vincent Senior Improvements in or relating to spraying nozzles for liquids
US3836080A (en) * 1973-09-10 1974-09-17 Ambac Ind Fuel injection nozzle
GB1537885A (en) * 1975-04-26 1979-01-10 Ntn Toyo Bearing Co Ltd Fuel injection valves
US4106702A (en) * 1977-04-19 1978-08-15 Caterpillar Tractor Co. Fuel injection nozzle tip with low volume tapered sac
EP0105793A2 (en) * 1982-09-30 1984-04-18 Allied Corporation Pressure compensated fuel injector

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997020659A1 (en) * 1995-12-05 1997-06-12 Robert Bosch Gmbh Valve obturator and method and device for producing the sealing surface on such obturators
GB2320059A (en) * 1996-12-09 1998-06-10 Caterpillar Inc I.c. engine fuel injector having non-contacting valve closing orifice structure
US5954033A (en) * 1996-12-09 1999-09-21 Caterpillar Inc. Fuel injector having non contacting valve closing orifice structure

Also Published As

Publication number Publication date
GB8802352D0 (en) 1988-03-02
GB8704746D0 (en) 1987-04-01

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)