EP2013471B1 - Dispositif de refoulement de carburant sous haute pression - Google Patents

Dispositif de refoulement de carburant sous haute pression Download PDF

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Publication number
EP2013471B1
EP2013471B1 EP07726366A EP07726366A EP2013471B1 EP 2013471 B1 EP2013471 B1 EP 2013471B1 EP 07726366 A EP07726366 A EP 07726366A EP 07726366 A EP07726366 A EP 07726366A EP 2013471 B1 EP2013471 B1 EP 2013471B1
Authority
EP
European Patent Office
Prior art keywords
pressure
flow path
delivery device
fuel delivery
pump
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.)
Not-in-force
Application number
EP07726366A
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German (de)
English (en)
Other versions
EP2013471A1 (fr
Inventor
Sascha Ambrock
Andreas Dutt
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2013471A1 publication Critical patent/EP2013471A1/fr
Application granted granted Critical
Publication of EP2013471B1 publication Critical patent/EP2013471B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • 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
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0275—Arrangement of common rails
    • F02M63/028—Returnless common rail system
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails

Definitions

  • the invention relates to a high-pressure fuel delivery device according to the preamble of claim 1.
  • Such a fuel high-pressure conveyor for an internal combustion engine is characterized by the WO 02/40857 A known.
  • This high-pressure fuel delivery device has a high-pressure pump and a low-pressure flow path that leads from a fuel inlet of the high-pressure fuel delivery device to a receiving space for a drive shaft of the high-pressure pump and to at least one inlet valve of the high-pressure pump.
  • a return flow path is provided, is returned via the leakage and / or lubricating fuel.
  • the return flow path leads out of the high pressure pump and flows into a return line to a tank and thus into a low pressure flow path. At least one further connection for the return flow path is thus required in addition to the fuel inlet at the high-pressure fuel delivery device, which leads to a complicated construction of the high-pressure fuel delivery device.
  • a high-pressure fuel conveyor in the form of a high-pressure pump is known, in which the high-pressure pump is shown only symbolically.
  • the high pressure pump does not have a return flow path for leakage and / or lubricating fuel. How a required lubrication of the high pressure pump is not specified here. From a connection between the high-pressure pump and a fuel reservoir performs a return flow path, which opens into a low-pressure flow path to the high-pressure pump. Both the return flow path and the low-pressure flow path are arranged outside the high-pressure pump.
  • the present invention has the object, a high-pressure fuel conveyor of the to provide the aforementioned type, which allows a cheaper construction of the fuel system.
  • the return flow path does not leave the high-pressure fuel delivery device, but is integrated into it.
  • the fuel passing through, for example, the shaft bearings and / or shaft seals of the drive shaft is not returned to the tank but remains within the high pressure fuel delivery by being introduced into the low pressure flow path. In this way, an undesirable heating of the fuel stored in the fuel tank is avoided.
  • An advantageous embodiment of the fuel high-pressure conveyor according to the invention is characterized in that it comprises an integrated prefeed pump. This creates a particularly compact and powerful high-pressure fuel delivery device.
  • the prefeed pump is arranged in the low-pressure flow path, and that the return flow path upstream of the prefeed pump in the low pressure flow path opens.
  • a fuel system with such designed high-pressure fuel delivery device is particularly simple and compact.
  • a mechanical pressure control valve may be provided with a return channel, which opens into the low-pressure flow path upstream of the prefeed pump.
  • a return channel which opens into the low-pressure flow path upstream of the prefeed pump.
  • the high-pressure fuel delivery device can be connected to an external feed pump.
  • an external feed pump Such may, for example, be provided in the region of the tank of the fuel system to which the high-pressure fuel delivery device belongs. In this way it is avoided that a fuel line with comparatively low pressure is present between the high-pressure fuel conveyor and the tank, in which, for example, vapor bubbles can form.
  • a particularly advantageous development of the high-pressure fuel delivery device is characterized in that a suction jet pump is arranged in the low-pressure flow path, which is driven by the fuel flowing to the inlet valve and into which the return flow path opens.
  • the passing through the shaft bearings for example, amount of fuel is sucked in this way by the suction jet pump.
  • the sum of the amount of fuel flowing directly from the receiving space to the intake valve and the amount of flow recirculated via the return flow path is then available as a high-pressure delivery quantity.
  • Such a high-pressure fuel delivery device has a good efficiency, and moreover, the lubrication of the bearings is improved by the forced extraction of the lubricating fuel.
  • an external prefeed pump is provided, with which the fuel high-pressure conveyor is connectable, the return of the lubricating fuel is ensured even at low speeds of the high pressure pump by such a suction jet pump.
  • the adjustment of the prefeed pressure that is, the pressure with which the fuel through the receiving space to the intake valve is promoted, be particularly well adjusted.
  • a particularly compact high-pressure fuel delivery device can be created.
  • an adjustable throttle device may be disposed downstream of the mouth of the return flow path.
  • metering unit allows adjustment of the delivery of the high-pressure pump and thus the high-pressure fuel conveyor.
  • At least one flow restrictor may be arranged in the return flow path.
  • a fuel system carries the overall reference numeral 10. It belongs to an internal combustion engine, not shown, which in turn drives a motor vehicle, not shown.
  • the fuel system 10 includes a fuel tank 12 in which a liquid fuel, such as gasoline or diesel, is stored. From the fuel tank 12, a fuel line 14 via a filter 16 to a high-pressure fuel conveyor 18. In this, the fuel is compressed to a high pressure and conveyed to a fuel pressure accumulator 20, which is also referred to as "rail". To the rail 20 a plurality of fuel injectors 22 are connected, which inject the fuel directly into them associated combustion chambers (not shown) of the internal combustion engine. To the rail 20, a controllable pressure relief valve 24 is connected, from which a drain line 26 leads back to the fuel tank 12.
  • a liquid fuel such as gasoline or diesel
  • the high-pressure fuel delivery device 18 includes a fuel inlet 28 to which the fuel line 14 is connected. From the fuel inlet 28, a channel 30 leads to a prefeed pump 32, which is integrated into the high-pressure fuel delivery device 18. From the prefeed pump 32, a channel 34 leads to a high-pressure pump 36.
  • the high-pressure pump 36 as well as the prefeed pump 32 is mechanically driven by the internal combustion engine, for example by a camshaft of the internal combustion engine.
  • the high pressure pump 36 comprises a housing 38 having a receiving space 40 for a provided with a cam 42 drive shaft 44. This works with two pistons 46 a and 46 b together, the delivery spaces 48 a and 48 b limit.
  • a channel 50 leads to an adjustable throttling device 52, from which in turn pass channels 54a and 54b via intake valves 56a and 56b to the delivery chambers 48a and 48b.
  • Channels 58a and 58b connect delivery chambers 48a and 48b to exhaust valves 60a and 60b. These simultaneously form a fuel outlet of the high-pressure fuel delivery device, to which the rail 20 is connected.
  • the drive shaft 44 is mounted in the housing 38 of the high-pressure pump 36 by shaft bearings.
  • the receiving space 40 is sealed to the outside via corresponding shaft seals.
  • These are not absolutely tight and therefore in FIG. 1 by channels 62a and 62b and corresponding throttles 64a and 64b.
  • the throttle or shaft seal 64a is arranged in a housing cover, the throttle or shaft seal 64b in a housing body. About limiting throttles 65a and 65b lead the channels 62a and 62b back to the channel 30.
  • the mouth is designated 66.
  • an overflow channel 68 branches off, in which a mechanical pressure control or overflow valve 70 is arranged.
  • the overflow channel 68 opens into the channel 62 a and thus ultimately into the channel 30 at 66.
  • the fuel is sucked in by the prefeed pump 32 from the fuel tank 12 and compressed to a comparatively low prefeed pressure, for example 4 bar, and conveyed into the receiving space 40 at this pressure. There it serves to cool and lubricate the bearings of the drive shaft 44. From the receiving space 40, the fuel flows via the adjustable throttle 52 to the intake valves 56a, b and on into the delivery chambers 48a, b, where it is compressed and via the outlet valves 60a, b for Rail 20 is promoted.
  • a comparatively low prefeed pressure for example 4 bar
  • the fuel which passes through for the lubrication of the bearings of the drive shaft 44 and via the shaft seals 64a, b is conveyed via the return flow path 62a, b to the suction side (channel 30) of the prefeed pump 32 and sucked back therefrom.
  • FIG. 2 A fuel system 10 with an alternative embodiment of a high pressure fuel delivery device 18 is shown in FIG FIG. 2 shown. It is true that such elements and areas that have equivalent functions to previously described elements and areas, the same reference numerals and are not explained in detail again.
  • the prefeed pump 32 is not integrated into the high-pressure fuel conveyor 18, but arranged as an external prefeed pump 32 in the region of the fuel tank 12. It is also not powered by the internal combustion engine, but electrically.
  • the pressure control valve 70 with the overflow channel 68 is arranged in the region of the prefeed pump 32 close to the fuel tank 12.
  • an ejector 74 is arranged in the channel 50, which leads from the receiving space 40 via the adjustable throttle 52 to the channels 54a, b and on to the inlet valves 56a, b. This is thus driven by the fuel flowing from the receiving space 40 to the inlet valves 56a, b, and in 66 opens the return flow path 62a, b.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (11)

  1. Dispositif de refoulement de carburant sous haute pression (18) pour un moteur à combustion interne, dans lequel le dispositif de refoulement de carburant sous haute pression (18) comprend au moins une pompe haute pression (36) et des voies d'écoulement (30, 34, 40, 50, 58a, 72), à travers lesquelles du carburant parvient depuis une entrée de carburant (28) du dispositif de refoulement de carburant sous haute pression (18) jusqu'à une sortie de carburant (60a, 60b) du dispositif de refoulement de carburant sous haute pression (18), les voies d'écoulement (30, 34, 40, 50, 58a, 58b, 72) comprenant une voie d'écoulement basse pression (72) qui conduit depuis une entrée de carburant (28) du dispositif de refoulement de carburant sous haute pression (18) jusqu'à un espace de réception (40) pour un arbre d'entraînement (44) de la pompe haute pression (36) et jusqu'à au moins une soupape d'admission (56) de la pompe haute pression (36), et comprenant une voie d'écoulement de retour (62), par le biais de laquelle du carburant de fuite et/ou de lubrification est ramené, la voie d'écoulement de retour (62) débouchant dans la voie d'écoulement basse pression (72), caractérisé en ce que la voie d'écoulement basse pression (72) conduit jusqu'à l'espace de réception (40) et ensuite jusqu'à l'au moins une soupape d'admission (56), en ce que la voie d'écoulement de retour (62) est intégrée dans le dispositif de refoulement de carburant sous haute pression (18) et ne quitte pas ce dernier, et en ce que la voie d'écoulement de retour (62) débouche (66) à l'intérieur du dispositif de refoulement de carburant sous haute pression (18) dans la voie d'écoulement basse pression (72).
  2. Dispositif de refoulement de carburant sous haute pression (18) selon la revendication 1, caractérisé en ce qu'il comprend une pompe de pré-refoulement intégrée (32).
  3. Dispositif de refoulement de carburant sous haute pression (18) selon la revendication 2, caractérisé en ce que la pompe de pré-refoulement (32) est disposée dans la voie d'écoulement basse pression (72), et en ce que la voie d'écoulement de retour (62) débouche (66) en aval de la pompe de pré-refoulement (32) dans la voie d'écoulement basse pression (72).
  4. Dispositif de refoulement de carburant sous haute pression (18) selon l'une quelconque des revendications 2 ou 3, caractérisé en ce qu'il comprend une soupape de régulation de la pression mécanique (70) avec un canal de trop-plein (68) qui débouche en aval de la pompe de pré-refoulement (32) dans la voie d'écoulement basse pression (72).
  5. Dispositif de refoulement de carburant sous haute pression (18) selon la revendication 1, caractérisé en ce qu'il peut être connecté à une pompe de pré-refoulement externe (32).
  6. Dispositif de refoulement de carburant sous haute pression (18) selon la revendication 5, caractérisé en ce que la voie d'écoulement de retour (62) débouche (66) entre l'espace de réception (40) et la soupape d'admission (56) dans la voie d'écoulement basse pression (72).
  7. Dispositif de refoulement de carburant sous haute pression (18) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une pompe à jet aspirant (74) est disposée dans la voie d'écoulement basse pression (72), laquelle est entraînée par le carburant s'écoulant jusqu'à la soupape d'admission (56) et dans laquelle débouche (66) la voie d'écoulement de retour (62).
  8. Dispositif de refoulement de carburant sous haute pression (18) selon l'une quelconque des revendications 2 à 7, caractérisé en ce que la pompe de pré-refoulement (32) est entraînée de manière électrique.
  9. Dispositif de refoulement de carburant sous haute pression (18) selon l'une quelconque des revendications 2 à 7, caractérisé en ce que la pompe de pré-refoulement (32) est entraînée au moins indirectement par le moteur à combustion interne.
  10. Dispositif de refoulement de carburant sous haute pression (18) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un dispositif d'étranglement réglable (52) est disposé dans la voie d'écoulement basse pression (72) en aval de l'embouchure (66) de la voie d'écoulement de retour (62).
  11. Dispositif de refoulement de carburant sous haute pression (18) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins un étranglement d'écoulement (65) est disposé dans la voie d'écoulement de retour (62).
EP07726366A 2006-04-21 2007-02-14 Dispositif de refoulement de carburant sous haute pression Not-in-force EP2013471B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006018702A DE102006018702A1 (de) 2006-04-21 2006-04-21 Kraftstoff-Hochdruck-Fördereinrichtung
PCT/EP2007/051410 WO2007122023A1 (fr) 2006-04-21 2007-02-14 Dispositif de refoulement de carburant sous haute pression

Publications (2)

Publication Number Publication Date
EP2013471A1 EP2013471A1 (fr) 2009-01-14
EP2013471B1 true EP2013471B1 (fr) 2011-11-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07726366A Not-in-force EP2013471B1 (fr) 2006-04-21 2007-02-14 Dispositif de refoulement de carburant sous haute pression

Country Status (6)

Country Link
EP (1) EP2013471B1 (fr)
CN (1) CN101427020A (fr)
AT (1) ATE535707T1 (fr)
BR (1) BRPI0706557A2 (fr)
DE (1) DE102006018702A1 (fr)
WO (1) WO2007122023A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008017222A1 (de) * 2008-04-04 2009-10-08 Continental Automotive Gmbh Pumpenanordnung zur Förderung eines Fluids
DE102008001704A1 (de) 2008-05-09 2009-11-12 Robert Bosch Gmbh Kraftstofffördereinrichtung
DE102010026159A1 (de) * 2010-07-06 2012-01-12 Audi Ag Kraftstoffsystem für eine Brennkraftmaschine
DE102010042587A1 (de) * 2010-10-18 2012-04-19 Robert Bosch Gmbh Kraftstoffpumpe für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine
DE102011003089A1 (de) 2011-01-25 2012-07-26 Robert Bosch Gmbh Überströmventil eines Krafteinspritzsystems
DE102011075474A1 (de) 2011-05-09 2012-11-15 Robert Bosch Gmbh Hochdruckpumpe
DE102011089623A1 (de) 2011-12-22 2013-06-27 Robert Bosch Gmbh Kraftstofffördereinrichtung für ein Kraftstoffeinspritzsystem sowie Kraftstoffeinspritzsystem
DE102012203724A1 (de) 2012-03-09 2013-09-12 Robert Bosch Gmbh Kraftstofffördereinrichtung für ein Kraftstoffeinspritzsystem mit einem Überströmventil sowie Überströmventil
DE102012210177A1 (de) 2012-06-18 2013-12-19 Robert Bosch Gmbh Kraftstofffördereinrichtung für ein Kraftstoffeinspritzsystem sowie Kraftstoffeinspritzsystem
DE102012212062A1 (de) 2012-07-11 2014-01-16 Robert Bosch Gmbh Niederdruckkreislauf für ein Kraftstoffeinspritzsystem, Kraftstoffeinspritzsystem sowie Verfahren zum Betreiben eines Kraftstoffeinspritzsystems
DE102015217863A1 (de) * 2015-09-17 2017-03-23 Continental Automotive Gmbh Kraftstoffeinspritzsystem
EP3601777B1 (fr) * 2017-03-29 2021-10-27 Wärtsilä Finland Oy Ensemble pompe à carburant haute pression pour moteur à piston à combustion interne

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19714488C1 (de) 1997-04-08 1998-09-03 Siemens Ag Verfahren zum Erwärmen von Kraftstoff und Kraftstoffeinspritzanlage
DE19941689A1 (de) * 1999-09-01 2001-03-15 Siemens Ag Einspritzanlage für eine Brennkraftmaschine
DE10057244A1 (de) 2000-11-18 2002-06-06 Bosch Gmbh Robert Kraftstoffeinspritzanlage für Brennkraftmaschinen mit verbessertem Startverhalten
DE10205187A1 (de) * 2002-02-08 2003-08-21 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
JP3915718B2 (ja) * 2003-03-11 2007-05-16 株式会社デンソー 燃料供給ポンプ

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Publication number Publication date
DE102006018702A1 (de) 2007-10-25
BRPI0706557A2 (pt) 2011-03-29
ATE535707T1 (de) 2011-12-15
WO2007122023A1 (fr) 2007-11-01
EP2013471A1 (fr) 2009-01-14
CN101427020A (zh) 2009-05-06

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