US3771506A - Fuel injection pump and automatic timing means therefor - Google Patents

Fuel injection pump and automatic timing means therefor Download PDF

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Publication number
US3771506A
US3771506A US00260393A US3771506DA US3771506A US 3771506 A US3771506 A US 3771506A US 00260393 A US00260393 A US 00260393A US 3771506D A US3771506D A US 3771506DA US 3771506 A US3771506 A US 3771506A
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United States
Prior art keywords
pressure chamber
pump
cam
piston
fuel
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Expired - Lifetime
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US00260393A
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English (en)
Inventor
C Davis
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Stanadyne Automotive Corp
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Stanadyne LLC
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Publication of US3771506A publication Critical patent/US3771506A/en
Assigned to MANUFACTURERS HANOVER TRUST COMPANY, AS AGENT reassignment MANUFACTURERS HANOVER TRUST COMPANY, AS AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: STANADYNE AUTOMOTIVE CORP.
Assigned to STANADYNE AUTOMOTIVE CORP., A CORP. OF DE reassignment STANADYNE AUTOMOTIVE CORP., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: STANADYNE, INC.
Anticipated expiration legal-status Critical
Assigned to STANADYNE INC. reassignment STANADYNE INC. RELEASE OF SECURITY INTEREST Assignors: CHEMICAL BANK, AS SUCCESSOR IN INTEREST TO MANUFACTURERS HANOVER TRUST COMPANY
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    • 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
    • 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

Definitions

  • a fuel injection pump is provided with timing control a bore of the fuel pump forms a pressure chamber in which the Appl. No.: 260,393
  • a hollow cap removably mounted in 123/139 Q, 417/218 advance piston is axially movable for controlling the Int. timing of injection.
  • An annulus around the cap pro.
  • Field of 2 /139 A 139 Q; vides a passage for the delivery of pressurized fuel to 221 the pressure chamber and a flat reed valve in the pressure chamber overlying the inlet port of the pressure References Cited chamber isolates the ring seals for sealing the annulus UNITED STAT mposed when lobes durin pumping strokes which otherwise may cause the seals ES PATENTS from the repetitive high pressure pulses i 417/218 the pumping plungers move past the cam we mm CV KE 40 8 666 999 111 37 to be extruded into the clearance gap between the cap and the bore.
  • This invention relates to fuel pumps of the type utilized for the delivery of fuel to compression-ignition engines, and more particularly to the means for automatically varying the timing of the pump in response to engine operating conditions.
  • the device of this invention is an improvement upon that disclosed and claimed in US. Pat. No. 2,660,992 dated Dec. 1, 1953.
  • Engine fuel pumps of the character referred to above deliver metered charges of liquid fuel under high pressure in sequence to the several cylinders of an associated engine in timed relationship therewith.
  • a cam ring of the pump having inwardly directed cam lobes surrounds one or more pump plungers which produce the high pressure charges of fuel so as to move the pump plungers bodily relative to the cam to translate the configuration of the cam lobes into the desired timed pumping strokes.
  • Another aim of this invention is to provide an improved timing'advance mechanism of the type referred to having increased durability and which is simple and economical to fabricate and assemble.
  • FIG. 1 is a simplified schematic view of a fuel pump of the type involved in the present invention
  • FIG. 2 is a fragmentary end view of an automatic timing mechanism of the prior art
  • FIG. 3 is a cross-sectional view of the timing mechanism incorporated in the present invention.
  • FIG. 4 is an elevational view of a valve used in the practice of the present invention.-
  • FIG. 1 a schematic representation of a fuel pump suitable for the practice of the present invention.
  • Fuel under pressure is delivered to the drilled passage of the pump housing to an annulus 12 for delivery to a metering valve passage 14 wherein a metering valve 16 provides a variable restriction to control the flow of fuel delivered through an annulus l8 and a passage 20 to the pump chamber 22 of a high pressure pump shown as comprising reciprocable pump plungers 24 simultaneously urged inwardly by cam lobes 26 of cam ring 28.
  • An inlet passage 19 may sequentially register with a plurality of ports (not shown) providing comm unication with annulus 18 when the plungers 24 are free to move outwardly.
  • Rollers 30 engage cam lobes 26 and act through shoes 32 to force the plungers 24 inwardly to pressurize the fuel contained in the pump chamber 22 to a high pressure.
  • the high pressure fuel from the pump chamber 22 is delivered by the passage 20 to a series of passages (not shown) positioned around the distributor rotor 34 for sequential registry with the passage 20 to deliver the charges of fuel from the pump chamber 22 to the several cylinders of the as sociated engine.
  • the cam ring 28 is mounted in the pump housing for a limited angular movement to adjust the angular positions of the cam lobes 26 and is restrained from rotating by the piston 40 of the automatic advance mechanism and the connecting pin 42.
  • a chamber at one end of piston 40 which is biased to the left by a spring (not shown), receives liquid fuel through the passage 44, the ball valve 46, and the passage 48.
  • the pressure in passages 10 and 44 is correlated engine speed, it is readily apparent that the pressure of the fuel acting on the piston 40 will adjust its position of equilibrium at different speeds.
  • the passage 44 could be connected to the annulus 18 to deliver metered fuel pressure to the advance mechanism so that the axial position of piston 40 would be adjusted according to load.
  • FIG. 2 which depicts a prior art design
  • fuel from the passage 48 enters the advance piston chamber 50 to urge the advance piston to the right against the opposing force provided by spring 52 so that a position of equilibrium is reached when the force of the liquid fuel in chamber 50 equals the spring force of spring 52.
  • Ball check 46 (FIG. 1) traps the fuel in the chamber 50 to offset the normal tendency of the cam 28 to move to a retard position as the rollers ride over the cam lobes of the cam ring 28.
  • An orifice 54 below the ball check 46, as well as leakage past the split metal piston ring 56 of the advance piston 40a, allows for the gradual bleeding of the fuel from the chamber 50 so that the advance piston 40a may move to the left to assume a new position of equilibrium when the pressure in passage 48 and chamber 50 decreases.
  • the seals 60, 62 are subjected to the repetitive high intensity pulses of hydraulic pressure each time the rollers 30 ride over the cam lobes of cam 28. This has resulted in the extrusion of the resilient 0" ring seal 60 into the clearance gap between the sleeve 64 and the bore 66 in which the sleeve is threaded causing the failure of the seal.
  • the seals for the advance piston assembly are safeguarded against the high pressure shock impulses imposed as the rollers 30 ride up on the cam lobes 26.
  • fuel under pressure from passage 48 enters the annulus 49 around the cap sleeve 64a which is provided with an axial groove 68 to provide open communication with the passage 70, 72, of the cap sleeve 64a which terminates an inlet port 74 in the chamber 50.
  • a flat annular reed valve (FIG. 4) overlying port 74 within the chamber 50 and is mounted around an adjusting screw 82 by means of a pair of mounting screws 84 to provide a flat ring seal for accommodating one way flow of fuel into the chamber 50.
  • leakage through bleed orifice 86 is returned to axial groove 68 to minimize the portion of the fuel required from annulus 12 for the operation of the advance mechanism.
  • a bleed orifice 86a could be substituted for bleed orifice 86.
  • the advance piston bias spring 52a has one end which seats against the head of an adjusting screw 82 and another end is fixed relative to piston 40a by a split washer 88 received within a groove 90 of the advance piston.
  • the adjusting screw serves to adjust the rate of advance by adjusting the spring force to change the axial position assumed by piston 40a at equilibrium at different engine speeds.
  • a shoulder 92 on piston 40a engages a shoulder on cap sleeve 64a to fix the maximum retard setting of the cam.
  • a fuel injection pump comprising a cam, pump plungers movable relative to'the cam to translate the contour of the cam into sequential pumping strokes, a source of fluid under a pressure correlated with an operating condition of the associated engine, a bore in said pump, a removable cap forming a pressure cham ber and cooperating with said bore to define a passage for the delivery of fluid to the inlet port of said pressure chamber from said source, seals interposed between said cap and said bore to prevent leakage from said passage, a piston movable in said chamber, a connector connecting the piston to the cam to control the position of the cam to advance and retard the relative timing of the pumping strokes, and a one-way valve in said pressure chamber overlying said inlet port to confine within said pressure chamber the pressure pulses resulting from the forces imposed on said cam by the pumping strokes.
  • valve is a flat reed valve.

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)
US00260393A 1972-06-07 1972-06-07 Fuel injection pump and automatic timing means therefor Expired - Lifetime US3771506A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US26039372A 1972-06-07 1972-06-07

Publications (1)

Publication Number Publication Date
US3771506A true US3771506A (en) 1973-11-13

Family

ID=22988985

Family Applications (1)

Application Number Title Priority Date Filing Date
US00260393A Expired - Lifetime US3771506A (en) 1972-06-07 1972-06-07 Fuel injection pump and automatic timing means therefor

Country Status (11)

Country Link
US (1) US3771506A (enrdf_load_stackoverflow)
JP (1) JPS4949026A (enrdf_load_stackoverflow)
AR (1) AR197814A1 (enrdf_load_stackoverflow)
AU (1) AU465961B2 (enrdf_load_stackoverflow)
BR (1) BR7304281D0 (enrdf_load_stackoverflow)
CA (1) CA974834A (enrdf_load_stackoverflow)
DE (1) DE2328272A1 (enrdf_load_stackoverflow)
FR (1) FR2188058B1 (enrdf_load_stackoverflow)
GB (1) GB1383466A (enrdf_load_stackoverflow)
IT (1) IT990625B (enrdf_load_stackoverflow)
SE (1) SE382660B (enrdf_load_stackoverflow)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3968779A (en) * 1975-02-11 1976-07-13 Stanadyne, Inc. Fuel injection pump and injection control system therefor
DE2643466A1 (de) * 1975-10-14 1977-04-28 Stanadyne Inc Kraftstoffeinspritzpumpe
US4079719A (en) * 1976-03-26 1978-03-21 Stanadyne, Inc. Timing control for fuel pump
US4108130A (en) * 1977-05-18 1978-08-22 Caterpillar Tractor Co. Fuel injection pump
US4118155A (en) * 1976-04-20 1978-10-03 Lucas Industries Limited Fuel pumping apparatus
US4154204A (en) * 1976-08-09 1979-05-15 Cav Rotodiesel Fuel injection pump responsive to an engine's intake air pressure
US4200072A (en) * 1977-05-18 1980-04-29 Caterpillar Tractor Co. Fuel injection pump
US4242059A (en) * 1976-04-20 1980-12-30 Lucas Industries Limited Fuel pumping apparatus
US4329962A (en) * 1980-09-29 1982-05-18 General Motors Corporation Diesel injection pump timing control with eccentric cam pin
US4378962A (en) * 1980-07-18 1983-04-05 Lucas Industries Limited Liquid fuel injection pumping apparatus
US4450819A (en) * 1981-05-15 1984-05-29 Nippondenso Co., Ltd. Device for adjusting injection timing of a distribution-type fuel injection pump
EP0635635A1 (en) * 1993-07-23 1995-01-25 Lucas Industries Public Limited Company Fuel pumping apparatus
WO1995013469A1 (de) * 1993-11-10 1995-05-18 Robert Bosch Gmbh Verteilerkraftstoffeinspritzpumpe für brennkraftmaschinen
US5551399A (en) * 1994-07-12 1996-09-03 Lucas Industries Public Limited Company Advance piston mounting

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS502737A (enrdf_load_stackoverflow) * 1973-05-10 1975-01-13
FR2367197A1 (fr) * 1976-10-11 1978-05-05 Roto Diesel Sa Perfectionnements aux pompes d'injection de combustible pour moteurs a combustion interne
GB1592172A (en) * 1977-01-28 1981-07-01 Lucas Industries Ltd Fuel pumping apparatus
JPS53106768U (enrdf_load_stackoverflow) * 1977-01-31 1978-08-28
JPH01147353U (enrdf_load_stackoverflow) * 1988-03-30 1989-10-12

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2660992A (en) * 1950-02-03 1953-12-01 Vernon D Roosa Automatic timing means for fuel pumps
US3051154A (en) * 1960-08-30 1962-08-28 Cav Ltd Liquid fuel pumps
US3116728A (en) * 1963-01-07 1964-01-07 Cav Ltd Liquid fuel pumps
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 (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2660992A (en) * 1950-02-03 1953-12-01 Vernon D Roosa Automatic timing means for fuel pumps
US3051154A (en) * 1960-08-30 1962-08-28 Cav Ltd Liquid fuel pumps
US3116728A (en) * 1963-01-07 1964-01-07 Cav Ltd Liquid fuel pumps
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 (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3968779A (en) * 1975-02-11 1976-07-13 Stanadyne, Inc. Fuel injection pump and injection control system therefor
DE2643466A1 (de) * 1975-10-14 1977-04-28 Stanadyne Inc Kraftstoffeinspritzpumpe
US4079719A (en) * 1976-03-26 1978-03-21 Stanadyne, Inc. Timing control for fuel pump
US4242059A (en) * 1976-04-20 1980-12-30 Lucas Industries Limited Fuel pumping apparatus
US4118155A (en) * 1976-04-20 1978-10-03 Lucas Industries Limited Fuel pumping apparatus
US4154204A (en) * 1976-08-09 1979-05-15 Cav Rotodiesel Fuel injection pump responsive to an engine's intake air pressure
US4200072A (en) * 1977-05-18 1980-04-29 Caterpillar Tractor Co. Fuel injection pump
US4108130A (en) * 1977-05-18 1978-08-22 Caterpillar Tractor Co. Fuel injection pump
US4378962A (en) * 1980-07-18 1983-04-05 Lucas Industries Limited Liquid fuel injection pumping apparatus
US4329962A (en) * 1980-09-29 1982-05-18 General Motors Corporation Diesel injection pump timing control with eccentric cam pin
US4450819A (en) * 1981-05-15 1984-05-29 Nippondenso Co., Ltd. Device for adjusting injection timing of a distribution-type fuel injection pump
EP0635635A1 (en) * 1993-07-23 1995-01-25 Lucas Industries Public Limited Company Fuel pumping apparatus
WO1995013469A1 (de) * 1993-11-10 1995-05-18 Robert Bosch Gmbh Verteilerkraftstoffeinspritzpumpe für brennkraftmaschinen
US5551399A (en) * 1994-07-12 1996-09-03 Lucas Industries Public Limited Company Advance piston mounting

Also Published As

Publication number Publication date
GB1383466A (en) 1974-02-12
AR197814A1 (es) 1974-05-10
AU5528873A (en) 1974-11-07
FR2188058B1 (enrdf_load_stackoverflow) 1980-04-04
AU465961B2 (en) 1975-10-09
BR7304281D0 (pt) 1974-06-27
SE382660B (sv) 1976-02-09
JPS4949026A (enrdf_load_stackoverflow) 1974-05-13
IT990625B (it) 1975-07-10
FR2188058A1 (enrdf_load_stackoverflow) 1974-01-18
CA974834A (en) 1975-09-23
DE2328272A1 (de) 1973-12-20

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AS Assignment

Owner name: MANUFACTURERS HANOVER TRUST COMPANY, AS AGENT

Free format text: SECURITY INTEREST;ASSIGNOR:STANADYNE AUTOMOTIVE CORP.;REEL/FRAME:005046/0096

Effective date: 19890210

AS Assignment

Owner name: STANADYNE AUTOMOTIVE CORP., A CORP. OF DE, CONNECT

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:STANADYNE, INC.;REEL/FRAME:005130/0582

Effective date: 19890210

AS Assignment

Owner name: STANADYNE INC., CONNECTICUT

Free format text: RELEASE OF SECURITY INTEREST;ASSIGNOR:CHEMICAL BANK, AS SUCCESSOR IN INTEREST TO MANUFACTURERS HANOVER TRUST COMPANY;REEL/FRAME:007308/0169

Effective date: 19950201