EP0372238A1 - Pompe d'injection de combustible pour moteurs à combustion interne - Google Patents

Pompe d'injection de combustible pour moteurs à combustion interne Download PDF

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Publication number
EP0372238A1
EP0372238A1 EP19890120542 EP89120542A EP0372238A1 EP 0372238 A1 EP0372238 A1 EP 0372238A1 EP 19890120542 EP19890120542 EP 19890120542 EP 89120542 A EP89120542 A EP 89120542A EP 0372238 A1 EP0372238 A1 EP 0372238A1
Authority
EP
European Patent Office
Prior art keywords
pump
fuel
piston
accumulator
fuel injection
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.)
Granted
Application number
EP19890120542
Other languages
German (de)
English (en)
Other versions
EP0372238B1 (fr
Inventor
Jean Leblanc
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0372238A1 publication Critical patent/EP0372238A1/fr
Application granted granted Critical
Publication of EP0372238B1 publication Critical patent/EP0372238B1/fr
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
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • F02M39/005—Arrangements of fuel feed-pumps with respect to fuel injection apparatus
    • 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
    • F02M41/02—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor being spaced from pumping elements
    • F02M41/06—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor being spaced from pumping elements the distributor rotating
    • 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
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically

Definitions

  • the invention relates to a fuel injection pump according to the preamble of the main claim.
  • a fuel injection pump known from DE-OS 33 18 236, the fuel delivered and compressed by a pump cylinder is fed to a store in the amount exceeding the required injection quantity and is intended to push it back into the pump workspace until the start of the suction stroke.
  • the accumulator is under high pressure due to the immediate absorption of the control surge until it is emptied; this requires a massive dimensioning of the memory and causes sealing problems.
  • there are different charge states of the accumulator and inaccuracies in the compressibility of the accumulator volume this does not guarantee that, even at high engine speeds, all of the fuel that has been cut off is returned to the pump work chamber.
  • connection between the accumulator and the pump work space is controlled via control edges, which are realized by annular and longitudinal grooves embodied in the pump piston.
  • the ring and longitudinal grooves take over part of the fuel flow between the accumulator and the pump work space.
  • the device according to the invention with the characterizing features of the main claim has the advantage that the control of the fuel supply of the pump work space can be represented by a simple device for which the use of a pump piston in its function as a control and distribution element for the fuel flow from and to the Pump work space is no longer required.
  • the device according to the invention is essentially formed by a simple feed pump which works on the displacement principle and an electrically controlled valve which works as a control means.
  • the feed pump is a small pre-feed pump that is able to absorb the discharge surge up to a limited pressure level, which reduces the dimensioning effort of the parts that are in effect with the pump and the sealing problem.
  • the measures listed in the subclaims permit advantageous developments and improvements of the fuel injection pump specified in the main claim.
  • the displacement element of the feed pump is designed as a stepped piston so that it is possible to supply more fuel to the pump work space during the filling process than was displaced by the pump piston during the previous movement section between the end of delivery and the reversal point in the uppermost position of movement and was driven off to the device , which leads to faster filling of the pump work space and faster operating speeds of the internal combustion engine.
  • FIG. 1 shows a partial longitudinal section through a radial piston pump
  • FIG. 2 shows an exemplary embodiment in a schematic illustration
  • FIG. 3 shows the movement plan of the pump piston.
  • a rotating distributor 2 which is guided in stationary bearings by a plurality of pumps which are radial to the distributor 2
  • Pump piston is supplied under pressure fuel.
  • a pump piston 3 is described in more detail here by way of example.
  • annular groove 4 is provided on the distributor 2. It is connected to a pump work chamber 5, the volume of which is periodically changed by the axially moving pump piston 3.
  • the pump piston 3 is sealingly and displaceably mounted in a bore 6 of a stationary piston carrier 7 that extends radially to the distributor 2.
  • a cranked spring plate 9 engages in an annular groove 8.
  • a piston return spring 10 acts on the bottom of the spring plate 9, the other end of which is supported in an annular groove 11 of the piston carrier 7.
  • a pot-shaped roller tappet 12 Concentrically surrounding the piston return spring 10 and also engaging with its cylindrical jacket in the annular groove 11, a pot-shaped roller tappet 12 with its inner bottom surface forms the contact surface for the side of the base of the spring plate 9 facing away from the piston return spring 10.
  • roller plunger 12 The outer bottom surface of the roller plunger 12 is due to the tension of the piston return spring 10 in frictional engagement with a roller 13, which is supported in a cam ring 14 driven synchronously with the distributor 2, through the inwardly directed cam of which the pump piston 3 is directed against the deflection of the piston return spring , the pump work space 5 performs a reducing stroke movement.
  • the fuel supply and the derivation of the excess fuel quantity of the pump work chamber 5 which has not been injected takes place via a fuel channel 15 which opens into a memory 16.
  • This has a movable wall 17 which is adjustable against the force of a spring 18 and one in shape from a provided stroke an annular groove designed relief opening 19, which is connected to a suction chamber 20 contained in the fuel injection pump, which is kept at a low pressure by means of a feed pump (not shown).
  • An electrically controlled valve 21 is inserted into the fuel channel 15.
  • the movable wall 17 of the accumulator 16 displaces a part of a stepped piston 22 which is smaller in diameter and which is displaceably mounted in a part of a stepped bore 51 in a sealing manner relative to the accumulator 16.
  • the larger diameter portion of the stepped piston 22 forms in a feed pump 23 a displacement element 24 with a displacement surface 25 formed from the annular surface between the large diameter and the small diameter of the stepped piston 22, which together with the other part of the stepped bore 51 forms a displacement space 26, which acts as a fuel storage space trained, limited.
  • the displacement space 26 has a suction line 27 ending in the suction space 20.
  • a first check valve 28 is inserted into this in such a way that a backflow from the displacement space 26 to the suction space 20 is prevented.
  • a fuel supply channel 29 leads away from the displacement space 26.
  • the delivery lines 32 are distributed according to the number of cylinders to be supplied to the associated internal combustion engine on the circumference of the bore 34 leading the distributor 2 and each contain a relief valve (not shown here) and an injection valve 33 each.
  • Figure 3 shows the elevation curve of the pump piston 3 over the angle of rotation.
  • the valve 21 in the point FB which indicates the start of delivery
  • this begins its high-pressure delivery, which is described in the point FE, which describes the end of delivery
  • the movable wall 17 reaches the relief opening 19, which opens the connection from the pump work chamber 5 to a suction chamber 20 contained in the fuel injection pump, the pressure level of which is comparatively low. This limits the pressure increase in the accumulator 16.
  • the stepped piston 22 is deflected. Whose Displacement surface 25 increases the volume in the displacement space 26, the pressure level of which drops below that in the suction space 20.
  • This pressure difference is compensated for by opening the first check valve 28 and fuel flow from the accumulator 20, which is pressurized by a pre-feed pump under low pressure, through the first check valve 28 into the displacement space 26 by the restoring force of the spring 18, the reverse movement of the movable wall 17, whereby it in turn shifts the fuel volume contained in the accumulator 16 via the fuel channel 15 to the pump work chamber 5 for filling it for the compression phase beginning after TDC.
  • the fuel filling of the pump work chamber 5 is additionally effected by the reversing movement of the stepped piston 22, the displacement surface 25 of which pushes additional fuel against the now closed first check valve 28 via the open second check valve 30 in the fuel supply channel 29, which is now located in the flow direction Fuel channel 15 transferred to the pump work space 5 until it is completely filled.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP89120542A 1988-12-02 1989-11-07 Pompe d'injection de combustible pour moteurs à combustion interne Expired - Lifetime EP0372238B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3840652A DE3840652A1 (de) 1988-12-02 1988-12-02 Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3840652 1988-12-02

Publications (2)

Publication Number Publication Date
EP0372238A1 true EP0372238A1 (fr) 1990-06-13
EP0372238B1 EP0372238B1 (fr) 1992-09-02

Family

ID=6368334

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89120542A Expired - Lifetime EP0372238B1 (fr) 1988-12-02 1989-11-07 Pompe d'injection de combustible pour moteurs à combustion interne

Country Status (3)

Country Link
EP (1) EP0372238B1 (fr)
JP (1) JPH02188665A (fr)
DE (2) DE3840652A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2682996A1 (fr) * 1991-10-29 1993-04-30 Bosch Gmbh Robert Pompe d'injection de carburant pour moteurs a combustion interne.
EP0472605B2 (fr) † 1989-05-17 2003-01-22 Schedler, Johannes, Dipl.Ing. Installation et procede pour traitement thermique d'effluents gazeux
DE102005042598B4 (de) * 2005-09-07 2008-10-16 Ab Skf Stößel

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10115168C1 (de) * 2001-03-27 2002-08-22 Orange Gmbh Kraftstoff-Hochdruckpumpe, insbesondere für Einspritzsysteme von Brennkraftmaschinen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB468958A (en) * 1936-01-15 1937-07-15 John Forster Alcock Improvements in fuel injection pumps for internal combustion engines
FR2519085A1 (fr) * 1981-12-30 1983-07-01 Maschf Augsburg Nuernberg Ag Dispositif d'injection de combustible pour moteurs a combustion interne
FR2536464A1 (fr) * 1982-11-24 1984-05-25 Bosch Gmbh Robert Pompe d'injection de carburant
EP0204982A2 (fr) * 1985-06-14 1986-12-17 Robert Bosch Gmbh Dispositif d'injection de combustible pour moteurs à combustion interne
US4643155A (en) * 1984-10-05 1987-02-17 Olin Corporation Variable stroke, electronically controlled fuel injection control system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB468958A (en) * 1936-01-15 1937-07-15 John Forster Alcock Improvements in fuel injection pumps for internal combustion engines
FR2519085A1 (fr) * 1981-12-30 1983-07-01 Maschf Augsburg Nuernberg Ag Dispositif d'injection de combustible pour moteurs a combustion interne
FR2536464A1 (fr) * 1982-11-24 1984-05-25 Bosch Gmbh Robert Pompe d'injection de carburant
US4643155A (en) * 1984-10-05 1987-02-17 Olin Corporation Variable stroke, electronically controlled fuel injection control system
EP0204982A2 (fr) * 1985-06-14 1986-12-17 Robert Bosch Gmbh Dispositif d'injection de combustible pour moteurs à combustion interne

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0472605B2 (fr) † 1989-05-17 2003-01-22 Schedler, Johannes, Dipl.Ing. Installation et procede pour traitement thermique d'effluents gazeux
FR2682996A1 (fr) * 1991-10-29 1993-04-30 Bosch Gmbh Robert Pompe d'injection de carburant pour moteurs a combustion interne.
DE102005042598B4 (de) * 2005-09-07 2008-10-16 Ab Skf Stößel

Also Published As

Publication number Publication date
JPH02188665A (ja) 1990-07-24
EP0372238B1 (fr) 1992-09-02
DE58902204D1 (de) 1992-10-08
DE3840652A1 (de) 1990-06-07

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