US3537654A - Metering and distributing device for fuel injection systems - Google Patents

Metering and distributing device for fuel injection systems Download PDF

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Publication number
US3537654A
US3537654A US778152A US77815268A US3537654A US 3537654 A US3537654 A US 3537654A US 778152 A US778152 A US 778152A US 77815268 A US77815268 A US 77815268A US 3537654 A US3537654 A US 3537654A
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Prior art keywords
flow passage
fuel
pressure
metering
passage sections
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Expired - Lifetime
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US778152A
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English (en)
Inventor
Gerhard Stumpp
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/16—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors
    • F02M69/18—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors the means being metering valves throttling fuel passages to injectors or by-pass valves throttling overflow passages, the metering valves being actuated by a device responsive to the engine working parameters, e.g. engine load, speed, temperature or quantity of air
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/50—Arrangement of fuel distributors, e.g. with means for supplying equal portion of metered fuel to injectors

Definitions

  • a unitary device for metering fuel and distributing the same to injection valves of an internal combustion engine said device includes a control plunger for varying synchronously flow passage sections associated with each injection valve to provide uniform metering of the fuel and a plurality of piston-cylinder assemblies, one associated with each injection valve, the piston of each said assembly controls the admission of fuel to its associated valve in response to the pressure fluctuations upstream of said synchronously variable flow passage sections to ensure a constant difference between the pressures upstream and downstream of said sections.
  • This invention relates to a metering'and' distributing device for continuously operating fuel injection systems used in particular in multicylinder internal combustion engines having distributing means and metering means which, in the case of an at least approximately constant pressure drop determines, by varying an adjustable flow passage section, the fuel quantities to be injected.
  • Devices of this type purport to provide for an exact metering of the fuel corresponding to the operating conditions of the internal combustion engine and for a uniform distribution of the fuel into the individual cylinders of the engine.
  • a device of the aforenoted type is disclosed in British Pat. No. 1,066,721 wherein the fuel is metered at a sole flow passage section by means of an arbitrarily displaceable needle.
  • a constant pressure drop is maintained by means of a throttle element disposed upstream of said section.
  • the throttle element is affected, on the one hand, by the fuel pressure downstream of the flow passage section and, on the other hand, by the pressure between the throttle element and the flow passage section.
  • the fuel is distributed to the individual cylinders subsequent to metering by means of a distributor operating with throttles.
  • the afore-outlined device is disadvantageous in that the pressure drop at the distributing throttles is formed by the difference between two high pressures and therefore it is strongly dependent on the changes in the injection pressure or in the delivery pressure that advances fuel to the distributor. Furthermore, the separate arrangement of the metering device and the distributor requires relatively expensive conduit systems.
  • I fuel injection valve there is associated a first variable flow passage section synchronously controlled by a plunger and a second variable flow passage section each controlled by a separate piston exposed to opposed pressures 3,537,654 Patented Nov. 3, 1970 upstream and downstream of said first variable flow passage sections.
  • FIG. 1 is a schematic representation of the principles of the invention
  • FIG. 2 is a cross-sectional view of a preferred embodiment
  • FIG. 3 is a sectional view along line III-III of FIG. 2.
  • FIG. 1 schematically showing the principles in structure and operation of the invention
  • the fuel is delivered by supply conduit 1 to a longitudinal bore 2 from which extend branch channels 3a.
  • the flow passage sections 4 of these branch channels are variable by a common control plunger '5 slidably disposed in bore 2.
  • Each branch channel 3a merges into a separate cylinder 6 in which there is arranged a piston 7 which, at its outer face, is exposed to the pressure prevailing in bore 2 and thus in the supply conduit 1 and, at its inner face, is exposed to the pressure in the respective branch channel 3a.
  • the latter pressure is aided by the force of a compression spring 8.
  • Each piston 7 controls a second flow passage section 9 associated With each branch channel 3b connecting cylinder 6 with an injection valve 30.
  • bushing sleeves 10 and 11 inserted in axial alignment into a housing block 12 define a longitudinal bore 2'.
  • the fuel supply conduit 1' merges radially into bore 2' and is in continuous communication with an annular circumferential groove 13 provided in the lateral face of a control plunger 5 slidably held in bore 2.
  • annular groove 13 defines a control edge 14 for varying flow passage sections 4' (only one shown), each formed in the bushing sleeve 10 by a narrow longitudinal slot 15.
  • the circumferential annular groove 13 also serves to equalize the pressures on control plunger 5'.
  • the slots 15 are of identical Width and all begin at the same height by starting from the frontal edge of bushing sleeve 10. These slots may be very accurately made with relatively inexpensive means.
  • the frontal edge of bushing sleeve 10 is sealed by the abutting front edge of the bushing sleeve 11.
  • Each slot 15 continues in a branch channel 3a merging into a cylinder 6'.
  • the exemplary embodiment shown in FIG. 2 comprises four cylinders 6 equidistantly arranged about longitudinal bore 2'.
  • a piston 7 formed preferably as a shell to minimize its mass.
  • Each piston 7' controls a second flow passage section 9 continuing in a branch channel 3b connecting each cylinder 6' with a fuel injection valve (not shown in FIGS. 2 and 3).
  • control plunger 5' is in continuous communication with ports 16 provided in bushing sleeves 11 and admitting the fuel delivery pressure prevailing in supply conduit 1 (Le. the pressure upstream of flow passage section 4) to the outer face of each piston 7'.
  • the inner face of each piston 7' is exposed to the pressure prevailing in branch channel 3a (i.e. the pressure downstream of flow passage section 4).
  • the cylinders 6' are closed by means of screw caps 18. Between the cap 18 and piston 7' there is disposed in each cylinder 6' a compression spring 8' urging the piston 7' towards the longitudinal bore 2' and thus aiding the pressure on the inner face of each piston 7.
  • the longitudinal bore 2' is closed by a plug 19.
  • the control plunger '5' is provided with an axial bore 20 for the discharge of fuel leaking into bore 2' beyond the control plunger 5'.
  • the fuel is, by virtue of the setting of the control plunger 5, metered identically for each branch channel 3a, 3a. Stated in other terms, the flow passage section 4, 4 (F) and the fuel quantity (Q) passing thereacross changes according to the formula Q zQ F zF at constant difference of the pressures upstream and downstream of the controlled flow passage section 4, 4'.
  • a constant difference between the pressures upstream and downstream of the flow passage sections 4, 4 is maintained in the following manner: Should the pressure increase in the supply conduit 1 1' (i.e. upstream of the flow passage sections 4, 4), the pistons 7, 7 are urged radially away from bore 2, 2', thus narrowing the flow passage sections 9, 9'. Consequently, the pressure in cylinders 6, 6' and in branch channels 3a, 3a (i.e. downstream of fiow passage sections 4, 4') also increases resulting in the maintenance of the original differential pressure. Conversely, should the pressure upstream of the flow passage sections 4, 4' decrease, the pistons 7, 7', by virtue of their responsive radial shift towards bore 2, 2, enlarge the flow passage sections 9, 9'.
  • a particular advantage achieved by the inventive device resides in a very accurate dosing of the injected fuel quantities which is made possible because, first, the distributing device and the metering device are connected in parallel and form a unit and, secondly, the control of the pressure drop at the individual flow passage sections 4, 4' is effected independently from one another.
  • the simple synchronous setting of the fiow passage sections 4, 4 by means of control plunger 5, 5 is a further advantage of the invention.
  • the injected quantity at each fuel injection valve is substantially independent of the delivery pressure that forces the fuel to the device and of the injection pressure of the individual fuel injection valves. Consequently, less expensive fuel injection valves may be used.
  • the pressure in the supply conduit may be relatively low.
  • Pressure fluctuations in the fuel injection conduit have, by virtue of the aforenoted arrangement of the flow passage sections 9, 9' downstream of the sections 4, 4', practically no effect on the metering of the fuel.
  • By virtue of the arrangement of the individual elements of the device less parts are necessary than if a correspondingly accurate distributor is arranged downstream of the metering device.
  • the smallest possible variable volume may be obtained in the injection circuit so that, also considering the small moment of inertia of the displaceable pistons, a maximum setting speed may be achieved.
  • Fuel metering and ditsributing device for a continuously operating fuel injection system having a plurality of injection valves each associated with a cylinder of a multi-cylinder internal combustion engine, said device comprising,
  • (C) supply means for simultaneously delivering fuel under pressure to each of said first branch channels through said first flow passage sections
  • control plunger is provided with a circumferential annular groove, said conduit is in continuous communication therewith, one terminal of said groove is provided with a control edge to vary in unison said first flow passage sections in communication -with said groove.
  • each said first fiow passage section is formed of a narrow, elongated slot.
  • each said piston has an inner and an outer face
  • each cylinder is provided with an opening to establish continuous communication between said supply means and said outer face of each piston
  • the position of said pistons is determined, on the one hand, by the fuel pressure downstream of said first flow passage sections and affecting said inner face of said pistons and, on the other hand, by the fuel pressure upstream of said first flow passage sections and affecting said outer face of said pistons.
  • each said piston has a shell-like configuration.

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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)
US778152A 1967-12-20 1968-11-22 Metering and distributing device for fuel injection systems Expired - Lifetime US3537654A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB0095922 1967-12-20

Publications (1)

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US3537654A true US3537654A (en) 1970-11-03

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US778152A Expired - Lifetime US3537654A (en) 1967-12-20 1968-11-22 Metering and distributing device for fuel injection systems

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US (1) US3537654A (de)
AT (1) AT290213B (de)
DE (1) DE1576489C3 (de)
FR (1) FR1595781A (de)
GB (1) GB1250345A (de)
SE (1) SE353373B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106622844A (zh) * 2016-12-01 2017-05-10 重庆金华兴门业有限公司 一种立式喷漆装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2246546C2 (de) * 1972-09-22 1984-12-06 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffzumeßventil einer Kraftstoffeinspritzanlage für gemischverdichtende fremdgezündete Brennkraftmaschinen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1973215A (en) * 1932-12-05 1934-09-11 Marvel Carbureter Co Injector
US2706520A (en) * 1947-10-29 1955-04-19 Niles Bement Pond Co Fluid distributing apparatus
US2852308A (en) * 1956-10-01 1958-09-16 Mrs Clare H Whitson Liquid fuel injectors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1973215A (en) * 1932-12-05 1934-09-11 Marvel Carbureter Co Injector
US2706520A (en) * 1947-10-29 1955-04-19 Niles Bement Pond Co Fluid distributing apparatus
US2852308A (en) * 1956-10-01 1958-09-16 Mrs Clare H Whitson Liquid fuel injectors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106622844A (zh) * 2016-12-01 2017-05-10 重庆金华兴门业有限公司 一种立式喷漆装置

Also Published As

Publication number Publication date
SE353373B (de) 1973-01-29
DE1576489A1 (de) 1970-06-18
DE1576489C3 (de) 1974-05-16
GB1250345A (de) 1971-10-20
FR1595781A (de) 1970-06-15
AT290213B (de) 1971-03-15
DE1576489B2 (de) 1973-10-18

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