US3830597A - Fuel pump and drive therefor - Google Patents

Fuel pump and drive therefor Download PDF

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Publication number
US3830597A
US3830597A US00246755A US24675572A US3830597A US 3830597 A US3830597 A US 3830597A US 00246755 A US00246755 A US 00246755A US 24675572 A US24675572 A US 24675572A US 3830597 A US3830597 A US 3830597A
Authority
US
United States
Prior art keywords
shaft
fuel
bearing
pump
housing
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
US00246755A
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English (en)
Inventor
K Donahue
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.)
Stanadyne LLC
Original Assignee
Stanadyne LLC
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 Stanadyne LLC filed Critical Stanadyne LLC
Priority to US00246755A priority Critical patent/US3830597A/en
Priority to AU53606/73A priority patent/AU466594B2/en
Priority to CA166,710A priority patent/CA974419A/en
Priority to JP48039638A priority patent/JPS4920523A/ja
Priority to ES413663A priority patent/ES413663A1/es
Priority to DE2319750A priority patent/DE2319750A1/de
Priority to FR7315607A priority patent/FR2182239B1/fr
Priority to GB1909173A priority patent/GB1413005A/en
Priority to IT23289/73A priority patent/IT984045B/it
Priority to AR247666A priority patent/AR196241A1/es
Priority to BR2969/73A priority patent/BR7302969D0/pt
Application granted granted Critical
Publication of US3830597A publication Critical patent/US3830597A/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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • 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

  • An inlet metering fuel injection pump for pressurizing metered charge of fuel to high pressure is provided with an independent helical gear driven drive shaft having its drive connection with the distributor rotor disposed concentrically with the governor flyweights.
  • the shaft is mounted by a ball bearing received within a deep bearing recess of the housing in which the bearing cannot bottom.
  • the bearing is axially fixed to the shaft and is axially slidable in the bearing recess.
  • a wave washer engages the outer race to bias the shaft toward the distributor rotor to prevent axial oscillations of the shaft and the resultant pumping and pressure pulsations in the fuel which fills the pump housing as torsional loading on the shaft suddenly changes. This eliminates any instability of operation due to toand-fro flow of fuel past the governor weights and pulsations of pressure acting on the plungers of the charge pump.
  • the present invention relates to fuel pumps of the type utilized in fuel injection systems for delivering measured charges of liquid fuel to the injectors of a compression-ignition engine. and more particularly to an improved drive for a pump of the type described in US. Letters Pat. No. 3,288,124 issued Nov. 29, I966.
  • Fuel pumps of the type involved in this invention are mounted by a mounting pad of an associated engine and driven by a drive gear in timed relation with the engine to deliver discrete measured charges of fuel to the several combustion chambers of the engine.
  • the measured charges of fuel are pressurized to high pressure generated intermittently by the pump to produce sudden repetitive changes in torsional loading on the pump drive.
  • the pump housing is filled with liquid fuel, and the axial movement of the shaft changes the volume of the fuel within the housing which is displaced by the shaft, axial shaft oscillations produce a pumping action which produces pulsations in the pressure ofthe fuel within the housing to affect the operation of the pump.
  • An object of this invention is to provide a pump having an improved drive for overcoming pulsations in housing pressure due to axial shaft oscillations.
  • Another object of this invention is to maintain the shaft of the pump in a fixed axial position within the housing.
  • a further object is to maintain the drive tang of the shaft in full engagement with the rotor of the pump.
  • FIGURE is a fragmentary elevational view, partly broken away, of a fuel pump illustrative of the present invention.
  • an illustrative pump is shown as having an external housing or casing provided with an axial bore 12 which rotatably supportsa pump rotor or distributor 14.
  • a vane type fuel supply or transfer pump 18 driven by the rotor 14 to pressurize incoming fuel from inlet 19 and deliver it through a passage 20 to a metering valve 22.
  • An end plate 24 is biased against the end of the cam ring v26 of the transfer pump 18 by a wave spring washer 30 to maintain the cam ring against a seal ring 32.
  • a high pressure charge pump generally noted by the numeral 34 is formed by transverse bore 37 in the rotor 14 in which are slidably mounted a pair of opposed plungers 36.
  • the outer end of the plungers 36 engage shoes 38 nesting rollers 40 which are mounted for radial movement in slots formed in the end of the rotor 14.
  • Rotor 14 is provided with a drive slot 42 for receiving the drive tang 44 of a separable gear driven shaft46 aligned with .the bore l2 to provide a driving connection with the rotor.
  • a generally circular cam ring 48 Surrounding the rotary member 14 is a generally circular cam ring 48 which encircles the rotor 14 in the plane of revolution of the plungers.
  • the cam conventionally has a plurality of pairs of diametrically'opposed inwardly extending cam lobes 50 which are adapted to actuate the plungers inwardly simultaneously for pressurizing the fuel as the rollers 40 act as cam followers for translating cam contour into reciprocal movement of the plungers 36.
  • Metered fuel from the metering valve 22 enters the passage 52 of the rotor as the passage 54 registers with metering valve port 56 and passes to the charge pump chamber 58 as the plungers '36 move radially outwardly.
  • the charge of fuel in the charge pump chamber 58 is pressurized as the plungers 36 are actuated inwardly by the cam lobes and is sequentially delivered to the several injectors of the engine as the passage 60 registers, during the rotation of the rotor, with a passage 62 leading to an outlet of the pump for delivery to one of the fuel injectors of the associated engine.
  • the pressure in the chamber 58 of the charge pump is suddenly released as the rollers pass over the nose of the cam lobes to suddenly release the loading imposed on the shaft.
  • the liquid fuel in the pump chamber 58 having been pressurized to several thousand pounds per square inch is compressed and as the rollers pass over the nose of the cam lobes, the pressure is suddenly relieved by the outward movement of the plungers, moving the rollers 40 along the downslope of the cam lobes to produce a reverse driving forceon the shaft 46.
  • the shaft 46 should move to the left, as viewed in the drawing, it displaces less fuel with which the cavity 66 of the'pump is filled to produce a negative pulsation of housing pressure which is maintained at suitable pressure, say, 8 to 10 p.s.i., within the housing. If the shaft 46 moves to the right, its displacement within the pump housing is increased to produce a positive pulsation of pressure within the housing. In addition, if the shaft shifts back and forth axially, the fuel in the gap 68 between the shaft and the rotor rushes in and out to produce a pulsating flow of fuel past the governor weights 70 to introduce an oscillating force, to affect the stability of the governor weights and introduce transients into the control of metering valve 22.
  • any movement of the drive tang 44 of the shaft 46 with respect to the drive tang slot 42 of the rotor produces frictional wear and where the drive tang is not fully engaged with the tang receiving slot 42 increased stress loading is imposed on the bifurcated end of the rotor forming the tang receiving slot.
  • means are provided for preventing axial oscillations of the drive shaft 46 and to insure that the tang is at all times fully engaged with the tang receiving slot of the rotor despite variations in the build up of manufacturing tolerances in the pump.
  • the inner race 72 of the ball bearing engages the shaft 46 with a light press fit to fix it rotationally and longitudinally with respect to the shaft.
  • the outer race 74 of the ball bearing is received within a bearing recess 76 of the housing with a sliding fit and the recess 76 is made sufficiently deep to provide an axial gap 78 so that the bearing race 74 does not bottom in the bearing recess 76 regardless of the build up of manufacturing tolerances of the pump.
  • a wave washer 80 engages the end of the outer race 74 to impose a thrust load against the outer race.
  • the wave washer 80 is held in place by a split ring retainer 82 received in a groove 84 in the wall of the bearing recess.
  • the thrust load imposed by the wave washer 80 against the outer bearing race is a fixed, but limited amount, say 12 pounds, which is sufficient to overcome any axial thrust which may be imposed on the rotor shaft during use so that it maintains the tang 44 fully engaged in slot 42 and the end of the rotor 14 bottomed against the end plate 24 of the transfer pump to fix the axial position of the shaft 46 and the rotor 14.
  • the foregoing drive construction will prevent a pumping action by the shaft and thereby eliminates pulsations of housing pressure in the pump and eliminates the adverse effects of such pulsations on the governor stability and the uniformity of the metering of fuel to the chamber of the charge pump. It is further apparent that the drive construction of this invention maintains the rotor in a fixed axial position to assure uniformity of registry of inlet and outlet ports of the rotor and the mating passages of the housing and to accommodate the build up of manufacturing tolerances inherent in the commercial manufacture of pumps.
  • a fuel injection pump comprising a housing having a bore and a fuel filled cavity, an axially fixed distributor rotor positioned in said bore, a separate drive shaft having an end providing a driving tang received in a mating tang receiving slot in said rotor to provide a driving connection therewith in said cavity, a centrifugal governor having fiyweights in said cavity concentrically of said drive shaft surrounding the end of said shaft, a helical drive gear for said shaft, a bearing mounted by said housing for supporting said shaft, said bearing being axially fixed with respect to said shaft, and means for preventing axial oscillations of said shaft, said means comprising a spring engaging said bearing to bias said shaft toward said rotor to prevent to-and-fro-flow of fuel past said governor flyweights due to pumping oscillations of said shaft and to maintain said tang fully engaged in said tang receiving slot.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
US00246755A 1972-04-24 1972-04-24 Fuel pump and drive therefor Expired - Lifetime US3830597A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US00246755A US3830597A (en) 1972-04-24 1972-04-24 Fuel pump and drive therefor
AU53606/73A AU466594B2 (en) 1972-04-24 1973-03-21 Fuel pump and drive therefor
CA166,710A CA974419A (en) 1972-04-24 1973-03-21 Fuel pump and drive therefor
JP48039638A JPS4920523A (enExample) 1972-04-24 1973-04-09
ES413663A ES413663A1 (es) 1972-04-24 1973-04-13 Perfeccionamientos introducidos en bombas inyectoras de combustible.
FR7315607A FR2182239B1 (enExample) 1972-04-24 1973-04-18
DE2319750A DE2319750A1 (de) 1972-04-24 1973-04-18 Kraftstoffpumpe sowie antrieb hierfuer
GB1909173A GB1413005A (en) 1972-04-24 1973-04-19 Fuel injection pump
IT23289/73A IT984045B (it) 1972-04-24 1973-04-20 Pompa per carburante e relativo dispositivo motore per motori ad accensione per compressione
AR247666A AR196241A1 (es) 1972-04-24 1973-04-24 Bomba inyectora de combustible
BR2969/73A BR7302969D0 (pt) 1972-04-24 1973-04-24 Bomba de injecao de combustivel bomba de injecao de combustivel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00246755A US3830597A (en) 1972-04-24 1972-04-24 Fuel pump and drive therefor

Publications (1)

Publication Number Publication Date
US3830597A true US3830597A (en) 1974-08-20

Family

ID=22932058

Family Applications (1)

Application Number Title Priority Date Filing Date
US00246755A Expired - Lifetime US3830597A (en) 1972-04-24 1972-04-24 Fuel pump and drive therefor

Country Status (10)

Country Link
US (1) US3830597A (enExample)
JP (1) JPS4920523A (enExample)
AR (1) AR196241A1 (enExample)
BR (1) BR7302969D0 (enExample)
CA (1) CA974419A (enExample)
DE (1) DE2319750A1 (enExample)
ES (1) ES413663A1 (enExample)
FR (1) FR2182239B1 (enExample)
GB (1) GB1413005A (enExample)
IT (1) IT984045B (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4530331A (en) * 1984-03-27 1985-07-23 Caterpillar Tractor Co. Thrust and planetary gear coupling for a rotor of a distributor fuel injection pump
GB2309374A (en) * 1996-01-25 1997-07-30 Alliedsignal Ltd Retractor with biased spool
US20160084258A1 (en) * 2013-05-08 2016-03-24 Ksb Aktiengesellschaft Pump Arrangement Comprising a Plain Bearing Arrangement

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR545762A (fr) * 1922-01-11 1922-10-20 Compresseur rotatif à gaz et à liquides
US1730896A (en) * 1926-05-15 1929-10-08 Howell Electric Motors Company Bearing for shafts
GB493577A (en) * 1936-08-10 1938-10-11 Bosch Robert Improvements in revolving cylinder fuel delivery pumps
US2909126A (en) * 1955-11-07 1959-10-20 Carroll G Gordon Rotary pump
US3161134A (en) * 1961-09-19 1964-12-15 Cav Ltd Liquid fuel injection pumps for internal combustion engines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR545762A (fr) * 1922-01-11 1922-10-20 Compresseur rotatif à gaz et à liquides
US1730896A (en) * 1926-05-15 1929-10-08 Howell Electric Motors Company Bearing for shafts
GB493577A (en) * 1936-08-10 1938-10-11 Bosch Robert Improvements in revolving cylinder fuel delivery pumps
US2909126A (en) * 1955-11-07 1959-10-20 Carroll G Gordon Rotary pump
US3161134A (en) * 1961-09-19 1964-12-15 Cav Ltd Liquid fuel injection pumps for internal combustion engines

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4530331A (en) * 1984-03-27 1985-07-23 Caterpillar Tractor Co. Thrust and planetary gear coupling for a rotor of a distributor fuel injection pump
GB2309374A (en) * 1996-01-25 1997-07-30 Alliedsignal Ltd Retractor with biased spool
GB2309374B (en) * 1996-01-25 2000-08-30 Alliedsignal Ltd Retractor
US20160084258A1 (en) * 2013-05-08 2016-03-24 Ksb Aktiengesellschaft Pump Arrangement Comprising a Plain Bearing Arrangement
US10253783B2 (en) * 2013-05-08 2019-04-09 Ksb Aktiengesellschaft Pump arrangement comprising a plain bearing arrangement

Also Published As

Publication number Publication date
AU5360673A (en) 1974-09-26
BR7302969D0 (pt) 1974-06-27
GB1413005A (en) 1975-11-05
FR2182239B1 (enExample) 1980-07-18
IT984045B (it) 1974-11-20
FR2182239A1 (enExample) 1973-12-07
JPS4920523A (enExample) 1974-02-23
DE2319750A1 (de) 1973-11-08
AR196241A1 (es) 1973-12-10
CA974419A (en) 1975-09-16
ES413663A1 (es) 1976-01-16

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Legal Events

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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