US3433172A - Fuel injection pump - Google Patents

Fuel injection pump Download PDF

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Publication number
US3433172A
US3433172A US613008A US3433172DA US3433172A US 3433172 A US3433172 A US 3433172A US 613008 A US613008 A US 613008A US 3433172D A US3433172D A US 3433172DA US 3433172 A US3433172 A US 3433172A
Authority
US
United States
Prior art keywords
cam
axis
pumping member
pump
lobes
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
US613008A
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English (en)
Inventor
Giuseppe Sola
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.)
Fiat SpA
Original Assignee
Fiat SpA
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 Fiat SpA filed Critical Fiat SpA
Application granted granted Critical
Publication of US3433172A publication Critical patent/US3433172A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0439—Supporting or guiding means for the pistons
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/042—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being cams

Definitions

  • the pumping member of the pump is connected by a link to one arm of a beam which is rotatable about a fulcrum carried by the pump casing.
  • the beam arms are proportioned to uninterruptedly establish contact with the periphery of the driving cam, which cam is formed with a plurality of equal lobes symmetrical in profile.
  • the invention relates to fuel-injection pumps for multicylinder internal combustion engines, and more particularly to injection pumps for high-speed diesel engines of the type having a single pumping member which is arranged to distribute fuel to a plurality of cylinders.
  • Injection pumps having a single pumping member and a distributor are known, for instance through US. Patent No. 2,965,087, wherein the pressure stroke of the pumping member is effected by a multiple-lobe cam, the return or suction stroke of the pumping member being effected by springs. It is also known to use injection pumps of this type for feeding fuel to high-speed diesel engines which have a plurality (6, 8 or even more) of cylinders, and in such a case the cam operating the single pumping member is arranged to rotate at the same speed as the engine shaft.
  • the invention resides in a fuel injection pump for a multi-cylinder internal combustion engine, more particularly a high-speed diesel engine, the pump being of the type including a single pumping member driven by a multiple-lobe cam and means for converting the oscillatory movements derived from the said cam into rectilinear reciprocatory movements and transmitting the said reciprocatory movements to the pumping member, wherein the means are without springs and that the reciprocations of the said pumping "ice member in either direction are constantly positively controlled by rotation of the said cam.
  • the periphery of the cam cooperates with a beam which comprises two arms and is pivoted to the pump casing at the junction of the said arms about an axis which is parallel to the rotational axis of the cam one said arm of the beam being connected to the pumping member by the movement-converting means and each of the two arms being so shaped with respect to the cam periphery that they remain permanently in direct or indirect contact therewith during rotation thereof either with each arm on one of two opposed flanks of the said cam lobe or with each arm on one of the adjacent flanks of two consecutive cam lobes.
  • each lobe of the cam is so shaped as to be symmetrical with respect to a radial plane which bisects it.
  • the beam and the cam are so arranged and dimensioned that, when the radial plane of symmetry of a lobe contains the rotational axis of the beam or when one of the radial planes of the cam, with respect to which the consecutive lobes are symmetrically arranged, contains the said rotational axis of the beam, the said planes constitute also the planes of symmetry of the contact points of the beam and cam.
  • each of the arms of the beam establishes contact with the periphery of the cam via rollers which are equal in diameter and have rotational axes parallel to the rotational axis of the beam.
  • the position of these rollers is such that at the stage half way along their approach stroke to or their return stroke from, the axis of the cam, the imaginary lines connecting their axes with the cam axis and lying in a plane perpendicular to the said cam axis, form an angle which equals half an angle formed by the said planes of symmetry of two consecutive cam lobes.
  • each of the two arms of the beam establishes contact with the periphery of the cam by means of a respective shoe portion, the surface of which portion that faces the cam periphery being of rounded profile.
  • one arm of the beam establishes contact with the periphery of the cam by means of a roller having its rotational axis parallel to the rotational axis of the beam, the other arm establishing contact by means of a shoe portion, the surface of which portion that establishes said contact with the periphery of the cam being rounded in profile.
  • FIGURE 1 is a diagrammatical side view, partly in cross section, of a portion of a pump according to the invention, which portion comprises an arrangement for operating a single pumping member with a four-lobed cam, the figure illustrating the general principles of operation of the said arrangement;
  • FIGURE 2 is a cross sectional view through a portion of an injection pump similar so that shown in FIGURE 1, the arrangement for operating the pumping member being shown in greater detail and in an operative position differing from that of FIGURE 1;
  • FIGURE 3 is a sectional view taken along line IIIIII of FIGURE 2;
  • FIGURE 4 is a sectional view taken along line IVIV of FIGURE 2.
  • FIGURE 5 is a cross sectional view through a modified injection pump also according to the invention, in which the pump arrangement for operating the pumping member comprises a six-lobed cam.
  • the cam 2 which is rotatable about the axis A, will be seen to be formed with four lobes.
  • the cam In a plane perpendicular to the said axis A, the cam exhibits a periphery which comprises the four lobes, each said lobe being divisible, by one of four radial planes AB, AC, etc., which are separated from each other by right angles, into two lobes halves the surfaces 3, 3 of which are symmetrical.
  • planes are herein referred to for convenience as planes of symmetry and it will be evident that when the number of cam lobes is less or more than four, the angles between the said planes of symmetry of the consecutive lobes will of course differ in value from the angle between the abovementioned planes AB and AC.
  • Two rollers 4, 5 are provided which bear on the cam periphery, these rollers being rotatably mounted on pivots 6, 7, respectively, the respective axes D, E of which pivots and rollers extend parallel to the axis A.
  • These pivots are supported by a beam 8 which is in turn rotatably mounted on a pivot 9 carried by the pump casing (not shown in FIGURE 1), the axis G of the pivot 9 also extending parallel to the axis A.
  • the aforementioned arrangement is so proportioned that the angle EGD is the supplement of half the angle CAB formed between the planes of symmetry AC and AB of the two consecutive cam lobes.
  • the axes D and E of the rollers 4, 5, respectively are in positions such that the angle formed between the plane extending through either the axis of D or E of a roller 4 or 5, respectively and through the axis G of the beam 8 and the plane extending through the same said axis D or E and the axis A of the cam 2, is a right angle.
  • the angle 5 formed between the planes extending through the axes A and D and A and E, respectively, is equal to half the angle a formed between the planes of symmetry AB and AC, that is it equals 360/2n, where n denotes the number of cam lobes.
  • the pivot 6 has further articulated thereto a link 10, the other end of which link is articulated, by a pivot 10a, to a slide 11 which is slidably mounted in a guide 12 secured to the pump casing.
  • the other end of the slide 11 is connected by a yoke to the pumping member 1 to prevent axial displacements of the member with respect to the slide but to permit rotational movements of the bottom portion of the pumping member 1.
  • the lobes and the cooperating rollers 4 and 5 and the beam 8 supporting the latter are so shaped that the roller 4 (or respectively 5) reaches its position of maximum spacing from the axis A of the cam 2 when the roller 5 (or respectively 4) reaches its minimum spacing from the above said axis and contacts the cam periphery along a line L equidistant from the planes of symmetry of two successive lobes.
  • FIG- URES 2 to 4 there is likewise provided a pump, the pumping member 1 of which is operated from a four-lobed cam 2, the said cam being rotatably mounted in a pump casing 13.
  • the cam 2 carries on one side a pivot 14 which is rotatably mounted in an inner wall part 15 of the casing 13 and on the other side a sleeve 16, the latter being partly shown broken away in FIGURE 3 to illustrate how it is splined at 17 to the driving shaft 18.
  • the splined coupling can be in the form of oblique teeth, such an arrangement providing for convenient variation of the timing of the cam 2.
  • the driving shaft 18 is rotated by a transmission of known type (not shown), various transmission ratios such as 1:1, 1:2, 3:4, etc. being adapted to suit particular pumping requirements.
  • the guide bushing 12 for the slide 11, previously referred to generally in connection with FIGURE 1 and shown in more detail in FIGURES 2, 3 and 4 is formed with a radial flange 12a through which holes are bored for attachment of the bushing by screws 19 to the underside of a frame 20 associated with a housing for the pumping member and overlying the casing 13.
  • the radial flange 12a on the guide bushing 12 is provided with two lateral extensions 12b, 12c which extend parallel to one another and which support the pivot 9 for the beam 8 (FIGURE 4) while uiding the opposite ends of the pivots 6, 7, respectively, on which pivots the rollers 4, 5, respectively, are rotatably mounted.
  • the pivot 6 further acts as the rotational center for elements 10', 10" which together constitute a link which is thus articulated at one of its ends to the pivot 6 and is articulated at the other of its ends to a pivot 10a which extends through an opening in the bottom portion of the slide 11.
  • the upper portion of the said slide 11 is slidable over the opposing internal surfaces 12, 12" of the guide bushing 12.
  • the above described mechanism is of course suitable both for operating the pumping member of an injection pump which is capable of effecting only the rectilinear reciprocations as denoted in FIGURE 3 by the arrow 21, and for operating a pumping member which, in addition to such rectilinear reciprocations, is capable also of rotating about its longitudinal axis as denoted in FIGURE 3 by the arrow 22.
  • the rectilinear reciprocations of the pumping member 1 are caused by rotation of a six-lobed cam 23, and the beam 8 with its associated two rollers 4, 5 is replaced by a beam 88 which carries only one roller 4.
  • the beam 88 follows the periphery 23' of the cam 23 by means of the roller 4 and also by means of a shoe portion 24, the operative surface 25 of the shoe which faces the cam periphery 23' being similar in curvature to the roller 4.
  • the construction of the embodiment described is such that the two rollers or the roller and shoe are constantly and simultaneously in contact either each one with one of the two opposite sides of a same lobe or each one with one of the adjacent sides of two consecutive lobes. This is of course apart from the existence of a slight safety clearance which is left for effective lubrication.
  • a pump according to the invention does not require return springs for restoring the pumping member in any direction, and the pattern of motion of the said pumping member on both its upward and its downward strokes is directly governed by the shape of the cam lobes and further controlled by the nature of the beam action.
  • the cam may have a base diameter which is appreciably larger than that of known pumps, so that even with a relatively short stroke length of the pumping member, a linear velocity of the pumping member can be obtained, which velocity is very high during the injection period.
  • a fuel injection pump for a multi-cylinder internal combustion engine said pump having a pump housing and a pumping member driven from a cam disc having a number of cam lobes thereon, said drive being through an oscillating beam having a fixed pivot, and cam lobe engaging rollers at equal distances from the pivot, said oscillating beam being pivotally connected with the pumping member, with the improvements comprising a slide (11) coupling the pumping member with the oscillating beam to move the pumping member axially thereof while allowing rotation of the pumping member, the slide movable in the pump housing in a direction parallel to the axis of the pumping member, the slide being connected to the oscillating beam through a link pivotally connected with the slide and with the beam, the pivotal axis (D) of the connection point of the link with the beam coinciding with the axis (6) of one roller (4) which cooperates with the cam disc, said axis (D) lying in a plane through the axis of the pumping member (1) and parallel to the cam disc

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
US613008A 1966-02-04 1967-01-31 Fuel injection pump Expired - Lifetime US3433172A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT272366 1966-02-04

Publications (1)

Publication Number Publication Date
US3433172A true US3433172A (en) 1969-03-18

Family

ID=11103351

Family Applications (1)

Application Number Title Priority Date Filing Date
US613008A Expired - Lifetime US3433172A (en) 1966-02-04 1967-01-31 Fuel injection pump

Country Status (8)

Country Link
US (1) US3433172A (ja)
AT (1) AT298882B (ja)
BE (1) BE693643A (ja)
CH (1) CH447715A (ja)
DE (1) DE6608714U (ja)
FR (1) FR1510400A (ja)
GB (1) GB1169302A (ja)
NL (2) NL6701643A (ja)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0456387A1 (en) * 1990-05-07 1991-11-13 Imed Corporation Fluid pump drive mechanism
US5279209A (en) * 1990-05-22 1994-01-18 Split Cycle Technology, Ltd. Rotary machine
CN113339223A (zh) * 2021-07-06 2021-09-03 青岛金三阳纺机科技有限公司 一种用于纺织机上的直拉式水泵系统
US11131282B2 (en) * 2019-03-01 2021-09-28 Denso Corporation Fuel injection pump
GB2598598A (en) * 2020-09-03 2022-03-09 Delphi Tech Ip Ltd Fuel pump
EP4130471A1 (en) 2021-08-03 2023-02-08 Idromeccanica Bertolini S.p.A. Reciprocation pump

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2296302A (en) * 1994-12-22 1996-06-26 Roland Graham Whiteing A trigger mechanism
DE102009042885B3 (de) * 2009-09-24 2010-09-09 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Expansionsmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2044064A (en) * 1934-11-10 1936-06-16 Campbell Wyant And Cannon Foun Pump
US2606496A (en) * 1938-11-09 1952-08-12 Friedmann Kg Alex Multiple outlet lubricating pump
US2777390A (en) * 1949-10-31 1957-01-15 Daimler Benz Ag Fuel injection pump
FR1288238A (fr) * 1961-02-10 1962-03-24 Perfectionnements apportés aux pompes alternatives, notamment pour l'injection de combustible

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2044064A (en) * 1934-11-10 1936-06-16 Campbell Wyant And Cannon Foun Pump
US2606496A (en) * 1938-11-09 1952-08-12 Friedmann Kg Alex Multiple outlet lubricating pump
US2777390A (en) * 1949-10-31 1957-01-15 Daimler Benz Ag Fuel injection pump
FR1288238A (fr) * 1961-02-10 1962-03-24 Perfectionnements apportés aux pompes alternatives, notamment pour l'injection de combustible

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0456387A1 (en) * 1990-05-07 1991-11-13 Imed Corporation Fluid pump drive mechanism
US5279209A (en) * 1990-05-22 1994-01-18 Split Cycle Technology, Ltd. Rotary machine
US11131282B2 (en) * 2019-03-01 2021-09-28 Denso Corporation Fuel injection pump
GB2598598A (en) * 2020-09-03 2022-03-09 Delphi Tech Ip Ltd Fuel pump
CN113339223A (zh) * 2021-07-06 2021-09-03 青岛金三阳纺机科技有限公司 一种用于纺织机上的直拉式水泵系统
CN113339223B (zh) * 2021-07-06 2023-03-10 青岛金三阳纺机科技有限公司 一种用于纺织机上的直拉式水泵系统
EP4130471A1 (en) 2021-08-03 2023-02-08 Idromeccanica Bertolini S.p.A. Reciprocation pump
WO2023012688A1 (en) * 2021-08-03 2023-02-09 Idromeccanica Bertolini S.P.A. Reciprocating pump

Also Published As

Publication number Publication date
NL6701643A (ja) 1967-08-07
BE693643A (ja) 1967-07-17
DE6608714U (de) 1971-11-11
FR1510400A (fr) 1968-01-19
NL130235C (ja)
CH447715A (it) 1967-11-30
GB1169302A (en) 1969-11-05
AT298882B (de) 1972-05-25

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