US3861835A - Liquid fuel pumping apparatus - Google Patents

Liquid fuel pumping apparatus Download PDF

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Publication number
US3861835A
US3861835A US356131A US35613173A US3861835A US 3861835 A US3861835 A US 3861835A US 356131 A US356131 A US 356131A US 35613173 A US35613173 A US 35613173A US 3861835 A US3861835 A US 3861835A
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US
United States
Prior art keywords
piston
servo valve
resilient means
pressure
fluid
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
US356131A
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English (en)
Inventor
Istvan Bakti
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
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CAV Ltd
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Filing date
Publication date
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Publication of US3861835A publication Critical patent/US3861835A/en
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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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/14—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons
    • F02M41/1405—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis
    • F02M41/1411—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis characterised by means for varying fuel delivery or injection timing
    • F02M41/1416—Devices specially adapted for angular adjustment of annular cam
    • 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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/14—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons
    • F02M41/1405—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis

Definitions

  • a fuel pumping apparatus includes an angularly ad- May 5, 1972 Great Br1ta1n 21014/72 justable cam ring a piston for effecting angular adjust ment, the piston containing a servo-valve which con- 1 1 1 a s 1 1 s s u a
  • References Clted means is provided firstly to limit the deflection of the UNITED STATES PATENTS first resilient means and secondly to limit the deflec- 2,910,975 11/1959 Evans 123/139 AQ tion of the second resilient means. 3,051,092 8/1962 Lambeck 417/219 3,394,688 7/1968 Roosa 123/139 A0 3 Claims, 3 Drflwmg Figures LIQUID FUEL PUMPING APPARATUS This invention relates to liquid fuel pumping apparatus for supplying fuel to internal combustion engines and has for its object to provide such an apparatus in a simple and convenient form.
  • a liquid fuel pumping apparatus in accordance with the invention comprises in combination, an injection pump including a plunger operable by a cam, the injection pump being driven in timed relationship with the engine to which fuel is supplied, a fluid pressure operable piston for controlling the timing of injection of fuel by the injection pump, means for supplying fluid at a pressure which varies in accordance with the speed at which the pump is driven, a servo valve operable to control the application of liquid under pressure to one end of said piston, said servo valve being located within a bore defined in said piston, first and second resilient means acting upon said servo valve to urge the servo valve towards a closed end of the bore, said servo valve contacting the closed end of the bore to urge the piston towards a position in which the timing of injection is fully retarded, passage means through which the fluid under pressure can flow to act on said servo valve in opposition to the force exerted by the resilient means and stop means operable firstly as the pressure of fluid increases, to limit the deflection of said first resilient means and secondly as the
  • FIGS. 1 and 2 are sectional side elevations through a portion of the apparatus of the two examples respectively.
  • FIG. 3 is a diagrammatic arrangement of the apparatus.
  • the apparatus includes a feed pump 7 which supplies fuel under pressure to an injection pump and distributor unit 9 which will be described in greater detail but which includes a timing device 8 also supplied with fuel under pressure.
  • the feed pump 7 includes valve means operable to ensure that the outlet pressure of the feed pump varies in accordance with the speed at which it is driven and there is also provided a regulator 6 which is arranged to provide fuel at a pressure which varies in accordance with the square of the speed at which the apparatus is driven.
  • the injection pump and distributor unit includes a body portion 10 in which is journalled a rotary cylindrical distributor member 11 which is driven in timed relationship with an engine with which the apparatus is associated.
  • the distributor member mounts a pair of pumping plungers 12, these being disposed in radially extending bores formed in the distributor member.
  • a drive ring 13 Surrounding one end of the distributor member is a drive ring 13 in which are formed radially extending slots positioned to correspond with the bores containing the plungers 12.
  • the slots accommodate shoes 14 and at the outer ends of the shoes are mounted rollers 15 which co-operate with the internal periphery of an annular cam ring 16 which is movable angularly within the body 10.
  • the internal periphery of the cam ring defines cam lobes 17 and as the distributor member rotates, inward movement is imparted to the plungers 12 through the interaction of the rollers 15 with the cam lobes 17.
  • the angular setting of the cam ring 16 within the body part determines the instant at which fuel is injected to the engine and by varying this setting so the timing of injection of fuel can be varied.
  • the adjustment of the cam ring is achieved by the device 8.
  • the device 8 includes a fluid pressure-operable piston 18 and this is formed with a peg 19 which is accommodated within a suitably shaped slot formed in the cam ring 16.
  • Formed within the piston 18 is a bore 20 which is closed at one end by means of a plug 21.
  • a servo valve 22 having a pair of spaced lands.
  • the space intermediate the lands is connected to the outlet of the feed pump 7 through a passage 22a formed in the piston 18 and extending through the body portion 10 whilst the space defined between the left hand land and the plug 21 is connected by way of passage means 23 to the regulator 6 which provides fuel under pressure which varies as the square of the speed at which the distributor member 11 is driven.
  • the servo valve 22 is loaded into contact with the plug 21 by means of a pair of springs 24, 25.
  • Spring 24 acts intermediate the end of the servo valve remote from the plug 21 and a stop means which is in the form of a top hat sectioned member 26.
  • the spring 25 is located within the member 26 and acts against its base and the end of an end closure 27 secured to the body part.
  • the outwardly directed flange of the member 26 is movable between two limits one of which is defined by the end closure 27 and the other of which is defined by a step defined by the end of the cylinder in which the piston 18 is mounted.
  • the amount by which the member 26 can move is distance A and the amount by which the servo valve must move before it contacts member 26 is referenced R.
  • a passage 30 which extends from the end of the piston remote from the springs to a port 28 which opens into the bore 20.
  • the port 28 is in the rest condition of the apparatus, covered by the right hand land of the servo valve.
  • the distance A which of course is a linear distance and which must be converted into degrees of angular movement of the cam ring 16. It is important to note that the distance X should be greater than the distance R otherwise the piston 18 would contact the outwardly turned flange of the member 26, before the servo valve contacted the member 26.
  • FIG. 2 The arrangement which is shown in FIG. 2 is substantially identical with that of FIG. 1 with the exception that the member 26a has its outwardly turned flange accommodated within aspace defined in the end closure member 27a.
  • the extent of movement of the member 26a is represented by A and this corresponds to the distance A in the example of FIG. 1.
  • the extent of movement of the piston 18a is limited by its abutment with the end closure 27a and the extent of movement is represented by the distance R plus A.
  • a liquid fuel pumping apparatus comprising in combination, an injection pump including a plunger operable by an adjustable cam, the injection pump being driven in timed relationship with the engine to which fuel is supplied, a fluid pressure operable piston for controlling the timing of injection of fuel by the injection pump, means connecting said piston and said cam whereby movement of the piston will effect adjustment of the cam, means for supplying fluid at a pressure which varies in accordance with the speed at which the pump is driven, a servo valve operable to control the application of liquid under pressure to one end of said piston, said servo valve being located within a bore defined in said piston, first and second resilient means of differing strengths acting upon said servo valve to urge the servo valve towards a closed end of the bore, said servo valve contacting the closed end of the bore to urge the piston towards a position in which the timing of injection is fully retarded, passage means through which fluid under pressure can flow to act on said servo valve in opposition to the force exerted by the resilient means and stop means operable firstly as the pressure of
  • a liquid fuel pumping apparatus comprising in combination, an injection pump including a plunger operable by an adjustable cam, the injection pump being driven in timed relationship with the engine to which fuel is supplied, a fluid pressure operable piston for controlling the timing of injection of fuel by the injection pump, means connecting said piston and said cam whereby movement of the piston will effect adjustment of the cam, means for supplying fluid at a pressure which varies in accordance with the speed at which the pump is driven, a servo valve operable to control the application of liquid under pressure to one end of said piston, said servo valve being located within a bore defined in said piston, first and second resilient means of differing strengths acting upon said servo valve to urge the servo valve towards a closed end of the bore, said servo valve contacting the closed end of the bore to urge the piston towards a position in which the timing of injection is fully retarded, passage means through which fluid under pressure can flow to act on said servo valve in opposition to the force exerted by the resilient means and stop means operable firstly as the pressure of fluid
  • said servo valve includes a land for controlling flow of fluid through a port defined in the bore of the piston, said port communicating with one end of a cylinder in which the piston is located, the arrangement being such that when fluid under pressure flows through said port into the cylinder, the piston will move to close said port.
  • stop surface which defines said second position of the member is defined by a surface formed on a plug closing one end of said cylinder.
  • stop surface which defines said first position of the member is defined by a stop surface defined at the end of said cylinder adjacent the plug.
  • stop surface which defines said first postion of the member is defined by a further surface formed on said plug, said further surface being disposed intermediate said first mentioned surface and said cylinder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)
US356131A 1972-05-05 1973-05-01 Liquid fuel pumping apparatus Expired - Lifetime US3861835A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2101472A GB1426726A (en) 1972-05-05 1972-05-05 Liquid fuel pumping apparatus

Publications (1)

Publication Number Publication Date
US3861835A true US3861835A (en) 1975-01-21

Family

ID=10155737

Family Applications (1)

Application Number Title Priority Date Filing Date
US356131A Expired - Lifetime US3861835A (en) 1972-05-05 1973-05-01 Liquid fuel pumping apparatus

Country Status (6)

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US (1) US3861835A (it)
JP (1) JPS5654452B2 (it)
DE (1) DE2322817A1 (it)
FR (1) FR2183817B1 (it)
GB (1) GB1426726A (it)
IT (1) IT984930B (it)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019835A (en) * 1974-07-19 1977-04-26 C.A.V. Limited Liquid fuel injection pumping apparatus
US4052971A (en) * 1975-10-10 1977-10-11 Stanadyne, Inc. Fuel injection pump and timing control therefor
US4118155A (en) * 1976-04-20 1978-10-03 Lucas Industries Limited Fuel pumping apparatus
US4242059A (en) * 1976-04-20 1980-12-30 Lucas Industries Limited Fuel pumping apparatus
WO2002061250A1 (en) * 2001-02-01 2002-08-08 Delphi Technologies, Inc. Advance arrangement

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2839014A1 (de) * 1978-09-07 1980-03-20 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
GB8528922D0 (en) * 1985-11-23 1986-01-02 Lucas Ind Plc Fuel injection pumping apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2910975A (en) * 1957-02-22 1959-11-03 Cav Ltd Liquid fuel pumps for internal combustion engines
US3051092A (en) * 1959-01-06 1962-08-28 United Aircraft Corp Pump torque limiting means
US3394688A (en) * 1965-11-01 1968-07-30 Hartford Machine Screw Co Fuel pump timing means
US3433159A (en) * 1967-01-17 1969-03-18 Cav Ltd Liquid fuel injection pumps

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2910975A (en) * 1957-02-22 1959-11-03 Cav Ltd Liquid fuel pumps for internal combustion engines
US3051092A (en) * 1959-01-06 1962-08-28 United Aircraft Corp Pump torque limiting means
US3394688A (en) * 1965-11-01 1968-07-30 Hartford Machine Screw Co Fuel pump timing means
US3433159A (en) * 1967-01-17 1969-03-18 Cav Ltd Liquid fuel injection pumps

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019835A (en) * 1974-07-19 1977-04-26 C.A.V. Limited Liquid fuel injection pumping apparatus
US4052971A (en) * 1975-10-10 1977-10-11 Stanadyne, Inc. Fuel injection pump and timing control therefor
US4118155A (en) * 1976-04-20 1978-10-03 Lucas Industries Limited Fuel pumping apparatus
US4242059A (en) * 1976-04-20 1980-12-30 Lucas Industries Limited Fuel pumping apparatus
WO2002061250A1 (en) * 2001-02-01 2002-08-08 Delphi Technologies, Inc. Advance arrangement
US20040084029A1 (en) * 2001-02-01 2004-05-06 Hopley Daniel Jeremy Advance arrangement
EP1526264A1 (en) * 2001-02-01 2005-04-27 Delphi Technologies, Inc. Advance arrangement
US6941932B2 (en) 2001-02-01 2005-09-13 Delphi Technologies, Inc. Advance arrangement

Also Published As

Publication number Publication date
JPS4954724A (it) 1974-05-28
DE2322817A1 (de) 1973-11-15
FR2183817B1 (it) 1975-12-26
FR2183817A1 (it) 1973-12-21
IT984930B (it) 1974-11-20
JPS5654452B2 (it) 1981-12-25
GB1426726A (en) 1976-03-03

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