US3910723A - Fuel injection pumps for I.C. engines - Google Patents

Fuel injection pumps for I.C. engines Download PDF

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Publication number
US3910723A
US3910723A US450431A US45043174A US3910723A US 3910723 A US3910723 A US 3910723A US 450431 A US450431 A US 450431A US 45043174 A US45043174 A US 45043174A US 3910723 A US3910723 A US 3910723A
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US
United States
Prior art keywords
shoes
stop
fuel
pump
plungers
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
US450431A
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English (en)
Inventor
Jean Claude Bonin
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.)
Roto Diesel SA
Original Assignee
Roto Diesel SA
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
Priority claimed from FR7309050A external-priority patent/FR2221625B2/fr
Application filed by Roto Diesel SA filed Critical Roto Diesel SA
Application granted granted Critical
Publication of US3910723A publication Critical patent/US3910723A/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
    • 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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
    • F02D1/02—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered
    • F02D1/08—Transmission of control impulse to pump control, e.g. with power drive or power assistance
    • F02D1/10—Transmission of control impulse to pump control, e.g. with power drive or power assistance mechanical
    • 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
    • F04B1/06—Control
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members

Definitions

  • a fuel injection pump for supplying fuel to internal combustion engines comprises a body part, a distributor member rotatable within the body part and adapted to be driven in timed relationship with an engine with which the pump is associated, a transverse bore formed in the distributor member, a pair of pumping plungers reciprocably mounted within the bore, a pair of shoes slidable in radial slots at the outeis ends of said bore, the shoes engaging the plungers during inward movement of the shoes, cam engaging means carried by said shoes, an annular cam ring surrounding said distributor, cam lobes formed on the internal periphery of said cam ring and engaging with said cam engaging means during rotation of said distributor member to impart inward movement to said shoes and plungers, fuel delivery means for conveying fuel displaced from said bore to a plurality of fuel outlets in turn, fuel inlet means for supplying fuel to said bore during the periods when the plungers can move outwardly, and means for moving the shoes axially whereby the amount of fuel which can be
  • said shoes are provided with an inclined zone and the distributor member mounts an abutment engageable with the inclined zone to limit the outward movement of the shoes.
  • FIG. 1 is a sectional side elevation of part of one example
  • FIGS. 2 and 3 are part sections on the lines IIII and IlllIl of FIG. 1,
  • FIG. 4 is a sectional side elevation of part of another example
  • FIG. 5 is a part section on the line V-V of FIG. 4, 5,
  • FIG. 5A is a view in the direction of the arrow A of FIG. 5.
  • FIG. 6 is a sectional side elevation of part of a further example.
  • FIG. 7 is a graph showing of fuel delivery for the pump shown in FIG. 6.
  • a pump body 10 defining a cylindrical cavity in which is mounted a fixed sleeve 11.
  • a rotary distributor member 12 which is adapted to be driven in timed relationship with an associated engine by means of a drive shaft 13.
  • a transversely extending bore 14 formed within the distributor member is a transversely extending bore 14 in which is mounted a pair of pumping plungers 15.
  • the bore communicates with a passage 16 which in known manner communicates with fuel outlets 17 in turn, formed in the body.
  • an annular carrier 18 Surrounding the distributor member 12 is an annular carrier 18.
  • the carrier is axially movable on the distributor member 12 but is angularly movable therewith.
  • the carrier is provided with a pair of radial slots in which are mounted shoes 19 which carry rollers 20.
  • Surrounding the carrier 18 is an annular cam ring 21 on the internal peripheral surface of which as seen in FIG. 2, are formed a plurality of cam lobes 22.
  • the cam lobes 22 in use, are engaged by the rollers 20 to effect inward movement of the plungers 15 during the time when the passage 16 is in communication with a fuel outlet 17. Outward movement of the plungers is under the action of fuel which is supplied to the transverse bore 14 from a source of fuel under pressure.
  • the cam lobes 22 are flared or tapered and the effect of this taper is that the inward movement of the plungers and therefore the amount of fuel supplied through the fuel outlet depends upon the axial setting of the annular carrier 18. In the particular arrangement as the carrier is moved towards the right as seen in FIG. 1 the amount of fuel supplied will decrease. At the section line indicated by FIG. 3 the cam lobes have tapered completely and therefore there will be no delivery of fuel.
  • the axial setting of the carrier 18 is controlled by an axially movable sleeve 23 slidable on the shaft 13.
  • the sleeve 23 is provided with a first flange 24 against which bears the forked end of a lever 25.
  • the lever 25 is pivotally mounted about a fulcrum point 26 and the other end of the lever is connected to a coiled tension spring 27 the force exerted by which can be adjusted by a manually operable device.
  • the sleeve 23 is provided with a further flange 28 which is acted upon by the toe portions of centrifugal weights 29.
  • the weights 29 are mounted in a cage 30 driven by the drive shaft 13.
  • the arrangement is such that for a given setting of the manually operable device as the speed of the engine increases the sleeve 23 will move towards the right as seen in FIG. 1 and like movement will be imparted to the annular carrier 18 thereby reducing the amount of fuel supplied to the engine.
  • the sleeve 23 will move towards the left and the annular carrier 18 is maintained in contact with the sleeve 23 by means of the force exerted by the spring loading of rams 31 carried within the sleeve 11. It will be appreciated that the springs loading the rams 31 assist the action of the spring 27.
  • the apparatus includes a pump body 10 and sleeve 11 in which is mounted the distributor member 12.
  • the distributor member as in the previous example, is provided with the transverse bore 14 accommodating plungers 15, the bore communicating with passage 16, the latter being positioned to register in turn with fuel outlets 17.
  • the carrier member 18 is again provided on the distributor member and at one end is acted upon by a spring 32.
  • the carrier member 18 is provided with a pair of radial slots in which are mounted shoes 33 respectively each mounting a roller 34.
  • the rollers 34 co-operate with cam lobes formed on the internal periphery of an annular cam ring 35 in this case the cam lobes being of constant height throughout their axial length.
  • a leaf spring stop 36 is provided and this is mounted on the rotor 12 and has its ends turned inwardly so as to be engageable by the roller shoes 33.
  • the thickness of each end of the stop 36 varies throughout their axial length and in a manner complementary to the shape of the presented edges of the side portions of the roller shoes 33. In this manner the maximum amount of fuel which can be supplied to the engine depends upon the axial setting of the carrier member 18. In the arrangement shown as the carrier member moves towards the left, as seen in FIG. 4, the amount of fuel which can be supplied increases.
  • the carrier is moved by fuel pressure actuated rams 37 only one of which is shown. As shown these have small extensions which pass through apertures in a stop plate 38 into engagement with the carrier member 18. The main portion of the rams however can engage the stop plate 38 to move same into contact with an annular stop member 39. At one point the stop member 39 is provided with a slot having a tapered end wall with which engages the complementarily tapered end of a manually adjustable member 40.
  • the arrangement is such that the axial setting of the carrier member 18 is determined by the fuel pressure which is applied to the rams 37. As the fuel pressure is increased then the carrier member is moved to the left against the action of the spring 32. As a result of such movement, the amount of fuel which can be supplied is increased.
  • the maximum amount of fuel which can be supplied occurs when the main portions of the rams 37 engage the stop plate 38 and move the latter into engagement with the stop member 39. When this abutment takes place, any further increase in fuel pressure will not bring about any further increase in the maximum amount of fuel which can be supplied.
  • the actual quantity of fuel supplied by the apparatus is controlled in a well-known manner, such as by means of a throttle. It will be appreciated that the direction of thickness variation of the end portions of the leaf stop 36 and the inclination of the edges of the shoes may be in the opposite direction to that which is shown. In this case movement of the carrier towards the left will effect a decrease in the amount of fuel supplied. With this arrangement the pump can supply extra fuel for starting purposes and this will decrease as the pressure applied to the rams increases.
  • the annular stop member 39 again acts as a maximum fuel stop since it determines how far the carrier 18 can be moved by the rams 37 in the direction to reduce the maximum fuel supplied to the engine.
  • FIG. 6 parts similar to those of FIG. 4 are given the same reference numerals.
  • the bore 14 together with the plungers are provided but in addition a further transverse bore 41 is provided which accommodates a pair of plungers 42.
  • a carrier member 43 is provided in this case modified to provide location for the shoes 33 and further shoes 44 associated with the plungers 42.
  • the bores 14 and 41 communicate with passages formed in the distributor member which may communicate with a single passage such as the passage 16 shown in the earlier examples or may communicate separate passages feeding fuel to two separate series of fuel outlets.
  • the shoes 33 are formed as in FIG. 4 and the shoes 44 are formed with a stepped edge indicated at 45. Moreover, the inturned ends of the leaf stop similar to leaf stop 36 shown in FIG. 4 associated with the shoes 44 are formed in a complementary manner. The effect of the shaping of the ends of the leaf stop is better understood with reference to FIG. 7.
  • the vertical axis represents the quantity of fuel pumped and the horizontal axis represents the axial position of the carrier member 43.
  • the lower characteristic represents the output from the bore 14 whilst the upper characteristic represents the output from the bore 41.
  • the axial setting of the carrier member 43 may be adjusted as with the example described with reference to FIG. 4.
  • a fuel injection pump of the kind intended for supplying fuel to internal combustion engines comprising a body part, a distributor member rotatable within the body part and adapted to be driven in timed relationship with an associated engine, a transverse bore in the distributor member, a pair of pumping plungers reciprocably mounted within the bore, a pair of shoes slidable in radial slots at the outer ends of said bore, said shoes engaging the plungers during inward movement of the shoes, cam engaging means carried by said shoes, an annular cam ring surrounding said distributor, cam lobes formed on the internal periphery of said cam ring and engaging with said cam engaging means during rotation of the distributor member to impart inward movement to said shoes and plungers, fuel delivery means for conveying fuel displaced from said bore to a plurality of fuel outlets in turn, fuel inlet means for supplying fuel to said bore during the periods when the plungers can move outwardly, a carrier member axially slidable on the distributor member, slots in the carrier member in which are located said shoes, respectively,
  • a pump as claimed in claim 1 including an element responsive to a fluid pressure for adjusting the axial setting of said carrier member.
  • a pump as claimed in claim 5 including a stop plate engageable with said annular stop member, an aperture in said stop plate, an extension on said ram of smaller size than the main portion of the ram, said extension passing through said aperture to engage said carrier to impart axial movement thereto as fluid pressure is applied to said ram, said main portion of the ram engaging said stop plate to limit the movement of the ram and thereby the carrier.
  • a pump as claimed in claim 3 including a further bore in the distributor member, a further pair of plungers in said further bore, a further pair of shoes axially movable by said carrier member, said further shoes defining further surfaces engageable by said stop memwhich can enter depending on the axial position of the her. carrier member, projections defined on said stop mem- 8.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)
US450431A 1973-03-14 1974-03-12 Fuel injection pumps for I.C. engines Expired - Lifetime US3910723A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7309050A FR2221625B2 (es) 1971-12-22 1973-03-14

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/543,534 Division US3936233A (en) 1973-03-14 1975-01-23 Fuel injection pumps for internal combustion engines

Publications (1)

Publication Number Publication Date
US3910723A true US3910723A (en) 1975-10-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
US450431A Expired - Lifetime US3910723A (en) 1973-03-14 1974-03-12 Fuel injection pumps for I.C. engines

Country Status (8)

Country Link
US (1) US3910723A (es)
JP (1) JPS5912864B2 (es)
AR (1) AR200768A1 (es)
BR (1) BR7401968D0 (es)
CA (1) CA998584A (es)
ES (1) ES424229A2 (es)
IT (1) IT1055553B (es)
ZA (1) ZA741646B (es)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050437A (en) * 1975-04-01 1977-09-27 Cav Limited Liquid fuel injection pumping apparatus
US4154204A (en) * 1976-08-09 1979-05-15 Cav Rotodiesel Fuel injection pump responsive to an engine's intake air pressure
US4225291A (en) * 1977-12-12 1980-09-30 Stanadyne, Inc. Fuel injection pump and plunger control means therefor
US4358255A (en) * 1980-01-09 1982-11-09 Lucas Industries Limited Liquid fuel injection pumping apparatus
US4652220A (en) * 1985-04-09 1987-03-24 Lucas Industries Liquid fuel pumping apparatus
US5044891A (en) * 1988-01-11 1991-09-03 Ozawa R&D, Inc. Variable displacement diaphragm pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2437502A1 (fr) * 1978-09-29 1980-04-25 Cav Roto Diesel Pompe d'injection de combustible

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2828697A (en) * 1954-04-13 1958-04-01 Vernon D Roosa Plunger control means for fuel pumps
US3000318A (en) * 1959-09-28 1961-09-19 Cav Ltd Liquid fuel pumps for internal combustion engines
US3338168A (en) * 1964-01-23 1967-08-29 Texaco Inc Fuel injection pump
US3650259A (en) * 1969-07-10 1972-03-21 Roto Diesel Sa Fuel injection pumps for combustion engines
US3847509A (en) * 1971-12-22 1974-11-12 Roto Diesel Sa Fuel injection pumps for i.c. engines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2828697A (en) * 1954-04-13 1958-04-01 Vernon D Roosa Plunger control means for fuel pumps
US3000318A (en) * 1959-09-28 1961-09-19 Cav Ltd Liquid fuel pumps for internal combustion engines
US3338168A (en) * 1964-01-23 1967-08-29 Texaco Inc Fuel injection pump
US3650259A (en) * 1969-07-10 1972-03-21 Roto Diesel Sa Fuel injection pumps for combustion engines
US3847509A (en) * 1971-12-22 1974-11-12 Roto Diesel Sa Fuel injection pumps for i.c. engines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050437A (en) * 1975-04-01 1977-09-27 Cav Limited Liquid fuel injection pumping apparatus
US4154204A (en) * 1976-08-09 1979-05-15 Cav Rotodiesel Fuel injection pump responsive to an engine's intake air pressure
US4225291A (en) * 1977-12-12 1980-09-30 Stanadyne, Inc. Fuel injection pump and plunger control means therefor
US4358255A (en) * 1980-01-09 1982-11-09 Lucas Industries Limited Liquid fuel injection pumping apparatus
US4652220A (en) * 1985-04-09 1987-03-24 Lucas Industries Liquid fuel pumping apparatus
US5044891A (en) * 1988-01-11 1991-09-03 Ozawa R&D, Inc. Variable displacement diaphragm pump

Also Published As

Publication number Publication date
CA998584A (en) 1976-10-19
IT1055553B (it) 1982-01-11
AU6655074A (en) 1975-09-18
AR200768A1 (es) 1974-12-13
ZA741646B (en) 1975-03-26
BR7401968D0 (pt) 1974-11-19
ES424229A2 (es) 1977-05-16
JPS5912864B2 (ja) 1984-03-26
JPS5048322A (es) 1975-04-30

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