US3929113A - Fuel injection pump - Google Patents

Fuel injection pump Download PDF

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Publication number
US3929113A
US3929113A US465349A US46534974A US3929113A US 3929113 A US3929113 A US 3929113A US 465349 A US465349 A US 465349A US 46534974 A US46534974 A US 46534974A US 3929113 A US3929113 A US 3929113A
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United States
Prior art keywords
fuel
plunger
engine
plungers
idling
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Expired - Lifetime
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US465349A
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English (en)
Inventor
Koichi Kawase
Yasuhide Suzuki
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Bosch Corp
Original Assignee
Diesel Kiki Co Ltd
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Publication date
Application filed by Diesel Kiki Co Ltd filed Critical Diesel Kiki Co Ltd
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Publication of US3929113A publication Critical patent/US3929113A/en
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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
    • 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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/24—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke
    • F02M59/26—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders
    • F02M59/265—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders characterised by the arrangement or form of spill port of spill contour on the piston

Definitions

  • ABSTRACT A fuel injection pump having two kinds of plungers rotatable by a common rack, one kind for supplying fuel and the other for ceasing fuel supply during the idling of an engine, comprising plungers for ceasing fuel supply during the idling of the engine, vertical grooves of metering helical grooves of said plungers being changed in width successively.
  • FIG. 1 A first figure.
  • the present invention relates to a fuel injection pump for an injection type internal combustion engine, par- 5
  • Diesel engines for vehicles tend to I operate at high speed due to increase of engine output and are so designed that range of number of revolutions from a minimum number of revolutions to a maximum number of revolutions is widened so as to obtain sufficient air supply and compression heat at a maximum speed and at a maximum load.
  • Diesel engines for vehicles tend to I operate at high speed due to increase of engine output and are so designed that range of number of revolutions from a minimum number of revolutions to a maximum number of revolutions is widened so as to obtain sufficient air supply and compression heat at a maximum speed and at a maximum load.
  • it is required to carry out an accurate and regular combustion even when the engine is idle.
  • the aforesaid design makes it difficult to meet such requirements during the idling of the engine.
  • This construction is of a multi-plunger type and provides an injection pump adapted to control a quantity of injected fuel by a rack which controls in common rotational position of each of plungers and a metering helical groove in the periphery of each plunger, wherein the fuel supplied cylinders and the fuel supply ceased cylinders when the engine is idle, have different shapes of metering helical grooves in the plungers corresponding to said cylinders, respectively, thereby supplying fuel and ceasing fuel supply.
  • An object of the invention is to eliminate the above. disadvantages and to obtain a fuel injection pump wherein fuel supply may be ceased for desired cylinders during the idling of the engine to thereby provide a smooth idling operation and to smoothly increase number of revolutions of the engine from the idling one, which could not be attained by prior arts, in addition to the prior arts that reduces discharge of exhaust gases and a great effect is offered in the accomplishment of smooth operation of the whole range of number of revolution of the engine.
  • a fuel injection pump comprising metering grooves in a plurality of in ection pump plungers for ceasing fuel supply, widths of vertical portions in communication with a plunger pump chamber are successively changed to orderly effect the feeding of fuel into the fuel supply ceased cylinders thus smoothly increasing the number of revolutions of the engine from number of revolutions in an idling state.
  • FIG. 1 is a sectional view of a plunger in a Bosch type fuel injection pump
  • FIG. 2 is a diagram showing relation between fuel quantity and rack position
  • FIGS. 3 and 4 are sectional views of further plungers similar to that shown in FIG. 1 but wherein the width of the vertical or longtidunal groove formed in the plunger is varied.
  • plunger assemblies In conventional fuel injection pumps such as illustrated, for example, in U.S. Pat. No. 3,438,327, two different groups of plunger assemblies are provided, viz., a first group of plungers which are designed to terminate fuel during idling and a second group of plungers which provide continuous fuel flow during idling.
  • the plunger assemblies of the former group include a so-called helical groove which provides a control edge, and a vertical groove which is connected to the helical groove in the idling region of the latter, i.e., in the region of the portion of the control edge which is moved to an operative position relative to the inlet port during engine idling.
  • a helical groove G and a vertical groove 1 are shown which are of conventional form and correspond to those discussed above.
  • the vertical groove 1 indicated in solid lines represents the groove that would be employed in a plunger used to terminate fuel flow during idling while groove 2 indicated in dashed lines would be employed in a plunger in which fuel is supplied throughout idling.
  • the plunger P in which grooves G and 1 are formed moves within a chamber C relative to an inlet port IP to control the fuel between inlet port IP and an outlet or discharge port OP.
  • FIG. 1 illustrates the bottom of the stroke of plunger P wherein fuel is supplied to the portion of chamber C formed above plunger P but is prevented from escaping therefrom by a check valve (not shown) positioned in outlet port OP.
  • This valve is open during the compression upstroke of plunger P so that fuel is discharged through outlet port OP at this time. Fuel flow is terminated on the downstroke of plunger P and it will be appreciated that with plunger P rotated to the idling position, wherein the upper portion of the helical groove G adjacent to vertical groove 1 registers with inlet port IP, the amount of fuel injected will be reduced since the fuel pressure above plunger P will be communicated to inlet port IP sooner (i.e., the inlet opening of port IP will be uncovered sooner) during the downward movement of plunger P than would be the case when plunger P is rotated to the position shown in FIG. 1.
  • a width (a) of vertical or longitudinal groove 1 in a plunger for ceasing fuel supply during the idling of an engine is formed greater than a width (b) of longitudinal groove 2 in a plunger for supplying fuel during the idling of the engine to such extent that the portion of the width (a b) thus cut corresponds to the lead portion during the idling of the engine.
  • the injection pump plungers provided with two kinds of longitudinal grooves having the groove widths (a) and (b) are suitably combined in accordance with number of cylinders in the engine, for example at the ratio of 3 to 3 in case of a six-cylinder, and, as noted, are rotated by a common rack to increase or decrease fuel supply, and the object was obtained by the characteristic line A of injection amount obtained by the plunger provided with a longitudinal groove having the width (a) and the characteristic line B of injection amount obtained by the plunger provided with a longitudinal groove having the width (b), as depicted in FIG. 2.
  • the total amount of the fuel to be supplied into the engine was rapidly changed in the vicinity of a point of intersection 3 of the characteristics lines A and B of injection amount shown in FIG. 2, causing the disadvantages such as hunting of the engine.
  • longitudinal grooves l, l, and l in the plungers for ceasing fuel supply during the idling of the engine are configured in widths successively changed as shown at a, a, and a in FIGS. 1, 3 and 4 and these plungers are used in order to obtain the characteristic lines A, A and A", as shown in FIG. 2, so as to have points of intersection in the plural positions shown as at 3', 3", while only one point of intersection 3 has heretofore been provided between the characteristic line of injection amount of the plungers for supplying fuel during the idling of the engine and the characteristic line of injection amount of the plungers for ceasing fuel supply,
  • a fuel injection pump comprising a plurality of pump devices each including a chamber and a plunger slidably disposed in oil tight relationship within the chamber, each said plunger including a helical'control edge formed thereon which cooperates with a port in the chamber to control the amount of fuel supplied, said pump devices being controlled from a common fuel rod, and a plurality of said plungers including a vertical fuel supply groove which opens at the top of the plunger and is connected to the helical control edge at a portion of the latter which corresponds to the engine idling position, the improvement wherein the width of the vertical groove is varied for each said plunger so as to provide a predetermined variation in the total amount of fuel to be supplied to the engine.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
US465349A 1973-05-07 1974-04-29 Fuel injection pump Expired - Lifetime US3929113A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1973052638U JPS501722U (enrdf_load_stackoverflow) 1973-05-07 1973-05-07

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US3929113A true US3929113A (en) 1975-12-30

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US465349A Expired - Lifetime US3929113A (en) 1973-05-07 1974-04-29 Fuel injection pump

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JP (1) JPS501722U (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4459952A (en) * 1982-07-28 1984-07-17 Edward Holstein Cylinder deactivator device for diesel engines
US4478187A (en) * 1982-05-13 1984-10-23 Diesel Kiki Co., Ltd. Distribution type fuel injection apparatus
US4489694A (en) * 1981-06-11 1984-12-25 Spica S.P.A. Modular fuel injection pumps for internal combustion engines

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0645427U (ja) * 1992-01-10 1994-06-21 日本ユニカー株式会社 ロールベールサイレージ用ストレッチフィルム

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2050134A (en) * 1934-07-07 1936-08-04 Bryce Ltd Fuel injection pump
US2810375A (en) * 1953-04-13 1957-10-22 Nordberg Manufacturing Co Injection pump for internal combustion engines
US3435811A (en) * 1967-06-14 1969-04-01 Int Harvester Co Multiple injection fuel pump
US3438327A (en) * 1966-07-11 1969-04-15 Holly Carburetor Co High speed automotive type diesel engine
US3677256A (en) * 1969-11-20 1972-07-18 Peugeot Fuel injection device for an internal combustion engine
US3792692A (en) * 1972-03-22 1974-02-19 Teledyne Ind Fuel injection device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS529250B2 (enrdf_load_stackoverflow) * 1973-02-27 1977-03-15

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2050134A (en) * 1934-07-07 1936-08-04 Bryce Ltd Fuel injection pump
US2810375A (en) * 1953-04-13 1957-10-22 Nordberg Manufacturing Co Injection pump for internal combustion engines
US3438327A (en) * 1966-07-11 1969-04-15 Holly Carburetor Co High speed automotive type diesel engine
US3435811A (en) * 1967-06-14 1969-04-01 Int Harvester Co Multiple injection fuel pump
US3677256A (en) * 1969-11-20 1972-07-18 Peugeot Fuel injection device for an internal combustion engine
US3792692A (en) * 1972-03-22 1974-02-19 Teledyne Ind Fuel injection device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4489694A (en) * 1981-06-11 1984-12-25 Spica S.P.A. Modular fuel injection pumps for internal combustion engines
US4478187A (en) * 1982-05-13 1984-10-23 Diesel Kiki Co., Ltd. Distribution type fuel injection apparatus
US4459952A (en) * 1982-07-28 1984-07-17 Edward Holstein Cylinder deactivator device for diesel engines

Also Published As

Publication number Publication date
JPS501722U (enrdf_load_stackoverflow) 1975-01-09

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