EP0795083B1 - Pompe d'injection de carburant - Google Patents

Pompe d'injection de carburant Download PDF

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Publication number
EP0795083B1
EP0795083B1 EP96908019A EP96908019A EP0795083B1 EP 0795083 B1 EP0795083 B1 EP 0795083B1 EP 96908019 A EP96908019 A EP 96908019A EP 96908019 A EP96908019 A EP 96908019A EP 0795083 B1 EP0795083 B1 EP 0795083B1
Authority
EP
European Patent Office
Prior art keywords
pump
diaphragm
drive
fuel
space
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
EP96908019A
Other languages
German (de)
English (en)
Other versions
EP0795083A1 (fr
Inventor
Wolfgang Fehlmann
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 EP0795083A1 publication Critical patent/EP0795083A1/fr
Application granted granted Critical
Publication of EP0795083B1 publication Critical patent/EP0795083B1/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
    • 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
    • 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
    • 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
    • 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
    • F04B1/0404—Details or component parts
    • F04B1/0448—Sealing means, e.g. for shafts or housings
    • 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
    • F04B1/0404—Details or component parts
    • F04B1/0452—Distribution members, e.g. valves
    • F04B1/0456—Cylindrical

Definitions

  • the invention is based on a fuel injection pump, in particular distributor injection pump, for Internal combustion engines, which in the preamble of claim 1 defined genus.
  • Such a fuel injection pump is from the EP 0 633 398 A1 is known.
  • the suction stroke of the pump piston by simultaneous volume change in the suction and Engine room the filling process of the pump work room positively supported.
  • the fuel injection pump according to the invention with the In contrast, features of claim 1 the advantage that by the invention, from a Diaphragm limited vacuum chamber pressure fluctuations in the Engine room due to compression or expansion of the Vacuum chamber can be compensated, whereby cavitation in the Engine room avoided and its filling with lubricating liquid is improved.
  • the Vacuum chamber is integrated in the fuel injection pump and does not require additional space.
  • the membrane preferably on the movable wall is attached to what is a movable Wall made of metal by soldering.
  • This has the advantage that by soldering to connect metal membrane and movable metal wall there is a vacuum between the two interconnected parts when cooling automatically sets.
  • the membrane can harden from the Soldering process can be carried out. A constructive one
  • the structure of the fuel injection pump is not changed required, since only the movable wall must be provided with a membrane.
  • the vacuum chamber of two edges on top of each other, firmly connected shells included the together a membrane box with two effective membrane surfaces form.
  • the vacuum chamber are through the double-sided membrane surfaces the most effective Work surfaces to compensate for pressure fluctuations significantly larger.
  • Fuel injection pump in the type of Radial piston distributor injection pump for Internal combustion engines have a housing 10 therein inserted cylinder liner 11, in which a Distributor 12 rotates in through a drive shaft 13 Direction of arrow 14 is driven.
  • pump cylinders 15 are Pump piston 16 guided axially between which a pump work space 17 is included.
  • the number of Pump cylinder 15 and pump piston 16 depends on the Number of those to be supplied by the fuel injection pump Cylinder or combustion chambers of the internal combustion engine.
  • the Outlet from the distributor 12 as Distribution opening serves in the course of the rotation of the Distributor 12 in succession during the lifting movements of the Pump piston 16 with one of several injection lines 20 connectable in the housing 10 of the Fuel injection pump are provided and to the individual cylinders or combustion chambers and arranged there Lead injection points of the internal combustion engine.
  • the pump pistons 16 are driven by a cam engine 21, arranged in an engine room 22 in the housing 10 is driven to their lifting movement.
  • the engine 21 has a cam ring 23 with a radially inward directed cam track 231 on which during the Rotation of the distributor 12 rollers 24 expire their radial movement via roller tappet 25 onto the pump piston 16 transferred.
  • the cam ring 23 is essentially fixed and can be used to adjust the start of spraying via a Pin 26, which is engaged by an injection piston, in be adjusted in a known manner.
  • the axial channel 18 opens into the front of the distributor 12 a fuel chamber 27 via a channel 28 in the housing 10 with a fuel storage space formed in the housing 10 29 is connected.
  • the confluence of the Axial channel 18 in the fuel chamber 27 is through a Solenoid valve 30 controlled so that the Pump work space 17 with the solenoid valve 30 open of the suction stroke of the pump pistons 16 from the storage space 29 can be supplied with fuel.
  • the solenoid valve 30 At the beginning of Delivery stroke of the pump piston 16 becomes the solenoid valve 30 closed and thus determines the start of injection and also the duration of the pump pistons during the delivery stroke 16
  • High-pressure fuel from the pump work space 17 is conveyed into the injection line 20. Start of injection and injection quantity are thus through the solenoid valve 30 fixed.
  • the storage space 29 is from the engine room 22 through a movable wall 37 separated, the one hand close to the cylindrical inner wall 101 of the housing 10 abuts and on the other hand, tightly with the cylinder liner 11 coaxial therewith connected is. Due to the large pressure difference of the Fuel in the storage space 29 (storage pressure) and the Fuel in the engine room 22 (lubrication pressure) can be on it be dispensed with that the pump piston 16 during its Suction strokes by springs on the roller tappet 25 and Rollers 24 are pressed against the cam track 231; because during the suction stroke of the pump piston 16, the solenoid valve 30 opened and the memory pressure affects the Pump working space 17 delimiting piston area of the Pump piston 16 while in the engine room 22nd projecting end of the pump piston 16 with the same area the lubricating pressure works. Because of this pressure difference the pump pistons 16 to the roller tappets 25 pressed and follow the radially outwards during the suction stroke directed lifting movement of the rollers 24.
  • the moveable Wall 37 gives way due to that in the storage space 29 occurring pressure peaks elastic to the engine room 22 out, whereby on the one hand the rapid pressure reduction in the Pump work space 17 is facilitated and on the other hand in Memory space 29 occurring pressure vibrations damped will.
  • the movable wall 37 is only for Pressure vibrations in the storage space 29 optimally designed and generated by evading to the engine room 22 in turn, pressure fluctuations in the engine room 22.
  • a vacuum chamber 38 arranged by a membrane 39 acted upon by the lubricating pressure is shown in the Engine room 22 .
  • the rigidity of the membrane 39 is designed so that they only with a pressure load that is slightly above the stationary lubrication pressure in the engine room 22 is in Moving towards the reduction of the vacuum chamber 38 can.
  • This design of the membrane 39 is necessary so that the vacuum chamber 38 by the stationary pressure in the engine room 22 does not collapse.
  • the vacuum chamber 38 is on the one hand from the movable wall 37 and on the other hand from the Membrane 39 limited.
  • the movable ones are preferred Wall 37 and the membrane 39 made of metal, and the Membrane 39 is soldered to the movable wall 37.
  • the soldering process can adjust the rigidity of the membrane 39 become, and the vacuum in the vacuum chamber 38 arises automatically after cooling.
  • Pressure fluctuations in Fuel inside the engine room 22 will now be by more or less pressing in the membrane 39 into the vacuum chamber 38 or by bulging the membrane 39 compensated for by increasing the volume of the vacuum chamber 38. This will avoid the dreaded cavitations, and the degree of filling of the engine room 22 is improved, which gives the engine very good lubrication overall 21 is ensured.
  • Fig. 3 is the Vacuum chamber 38 enclosed by two shells 40, 41, the edge on top of each other and firmly connected are.
  • the two shells 40, 41 form a membrane box 42 with two effective membrane surfaces.
  • the membrane box 42 is attached with its edge to the movable wall 37, wherein care is taken that the movable wall 37 facing membrane surface not to the movable wall 37 triggers.
  • the membrane box 42 can also on others Components attached within the engine room 22 will. It is also possible to attach the Membrane can 42 within the engine room 22 through clamping on the edge between two components to make.
  • the invention is not based on the described Embodiment limited. So it can make sense as shown in Fig. 1, a check valve 44 in the Line 34 between the pre-feed pump 31 and the suction chamber 29 to integrate, which is expedient in the Line section after branching line 35 is arranged.
  • a check valve 44 achieved that the pressure in the storage space 29 when opening of the axial channel 18 through the solenoid valve 30 via the set delivery pressure of the feed pump 31 increase can and thus at the beginning of the subsequent Filling process of the pump work space 17 a larger one Druckunte Kunststoff is available, the filling of the Pump work room 17 improved.

Landscapes

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

Claims (7)

  1. Pompe d'injection de carburant notamment pompe distributrice pour moteurs à combustion interne comprenant :
    au moins un piston de pompe (16) guidé en coulissement axial dans un cylindre de pompe (15), et délimitant frontalement une chambre active de pompe (17),
    un mécanisme d'entraínement (21) agissant sur la face frontale du piston de pompe (16) opposée à celle de la chambre de pompe (17), qui entraíne le piston de pompe (16) pour effectuer des courses de pression et de transfert dans la direction axiale,
    une chambre à mécanisme (22) recevant le mécanisme (21) et remplie d'un liquide lubrifiant,
    une chambre de réserve (29) remplie de carburant, séparée de la chambre du mécanisme (22) par une paroi mobile (37), et à partir de laquelle, lors des courses d'aspiration du piston de pompe (16), on remplit de carburant la chambre active (17) et à la fin de la course de transfert du piston de pompe (16), une fraction de la pression d'injection est fournie par le carburant transféré au cours de la course de transfert,
    la pression du carburant dans la chambre de réserve (29) étant beaucoup plus grande que la pression du liquide dans la chambre du mécanisme (22),
    caractérisée en ce qu'
    une chambre à vide (38) est prévue dans la chambre à mécanisme (22), cette chambre à vide étant délimitée au moins partiellement par une pression partielle de liquide dans le mécanisme à vide (22), sollicitant la membrane (99, 40, 41),
    et la rigidité de la membrane (39, 40, 41) est telle que pour une contrainte de pression seulement légèrement au-dessus de la pression stationnaire du liquide dans la chambre du mécanisme (22), elle passe dans la chambre à vide (38).
  2. Pompe selon la revendication 1,
    caractérisée en ce que
    la membrane (39) délimite la chambre à vide (38) avec la cloison mobile (37) et la membrane (39) est fixée à la cloison mobile (37).
  3. Pompe selon la revendication 2,
    caractérisée en ce que
    la cloison mobile (37) et la membrane (39) sont en métal et la membrane (39) est soudée sur la paroi mobile (37).
  4. Pompe selon la revendication 1,
    caractérisée en ce que
    la chambre à vide (38) est délimitée par trois coquilles (40, 41) reliées solidairement, adjacentes par leur côté du bord, ces coquilles formant avec deux surfaces enveloppe actives, une boíte à membrane (42) correspondante.
  5. Pompe selon la revendication 4,
    caractérisée en ce que
    la boíte à membrane (42) est fixée du côté du bord contre une pièce de la pompe d'injection de carburant.
  6. Pompe selon la revendication 5,
    caractérisée en ce que
    la pièce est la cloison mobile (37) entre la chambre de réserve (29) et la chambre à mécanisme (22).
  7. Pompe selon la revendication 4,
    caractérisée en ce que
    la boíte à membrane (42) est fixée du côté du bord entre deux pièces de la pompe d'injection de carburant.
EP96908019A 1995-08-30 1996-03-29 Pompe d'injection de carburant Expired - Lifetime EP0795083B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19531811A DE19531811A1 (de) 1995-08-30 1995-08-30 Kraftstoffeinspritzpumpe
DE19531811 1995-08-30
PCT/DE1996/000612 WO1997008454A1 (fr) 1995-08-30 1996-03-29 Pompe d'injection de carburant

Publications (2)

Publication Number Publication Date
EP0795083A1 EP0795083A1 (fr) 1997-09-17
EP0795083B1 true EP0795083B1 (fr) 1998-09-16

Family

ID=7770700

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96908019A Expired - Lifetime EP0795083B1 (fr) 1995-08-30 1996-03-29 Pompe d'injection de carburant

Country Status (6)

Country Link
US (1) US5794594A (fr)
EP (1) EP0795083B1 (fr)
JP (1) JPH10508358A (fr)
DE (2) DE19531811A1 (fr)
RU (1) RU2156881C2 (fr)
WO (1) WO1997008454A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3180948B2 (ja) * 1996-09-03 2001-07-03 株式会社ボッシュオートモーティブシステム ダイヤフラム型ダンパ
DE19712872A1 (de) * 1997-03-27 1998-10-01 Bosch Gmbh Robert Pumpe, insbesonder Hochdruckpumpe für eine Kraftstoffeinspritzvorrichtung eines Verbrennungsmotors
JPH11132130A (ja) * 1997-10-27 1999-05-18 Mitsubishi Electric Corp 筒内噴射用高圧燃料ポンプ
JP3471587B2 (ja) * 1997-10-27 2003-12-02 三菱電機株式会社 筒内噴射用高圧燃料ポンプ
DE10327408B4 (de) * 2002-10-19 2017-10-26 Robert Bosch Gmbh Vorrichtung zum Dämpfen von Druckpulsationen in einem Kraftstoffsystem einer Brennkraftmaschine
DE10307877A1 (de) * 2003-02-25 2004-09-02 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
JP4036153B2 (ja) * 2003-07-22 2008-01-23 株式会社日立製作所 ダンパ機構及び高圧燃料供給ポンプ
ATE366874T1 (de) * 2005-06-09 2007-08-15 Thomas Magnete Gmbh Dosierpumpe
JP4686501B2 (ja) * 2007-05-21 2011-05-25 日立オートモティブシステムズ株式会社 液体脈動ダンパ機構、および液体脈動ダンパ機構を備えた高圧燃料供給ポンプ
DE102008043643A1 (de) * 2007-11-29 2009-06-04 Robert Bosch Gmbh Kraftstoffeinspritzsystem für eine Brennkraftmaschine mit HC-Injektor
JP5002523B2 (ja) 2008-04-25 2012-08-15 日立オートモティブシステムズ株式会社 燃料の圧力脈動低減機構、及びそれを備えた内燃機関の高圧燃料供給ポンプ
IT1396142B1 (it) * 2009-11-03 2012-11-16 Magneti Marelli Spa Pompa carburante con dispositivo smorzatore perfezionato per un sistema di iniezione diretta
DE102011008467B4 (de) * 2011-01-13 2014-01-02 Continental Automotive Gmbh Injektor mit Druckausgleichsmitteln
DE102015219772A1 (de) * 2015-10-13 2016-10-06 Continental Automotive Gmbh Niederdruckdämpfer sowie Kraftstoffhochdruckpumpe
US9897056B1 (en) 2016-11-22 2018-02-20 GM Global Technology Operations LLC Protective cover assembly for a fuel pump

Family Cites Families (15)

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Publication number Priority date Publication date Assignee Title
GB1349155A (en) * 1971-03-01 1974-03-27 Lucas Industries Ltd Device for damping fluid pressure fluctuations
US4573442A (en) * 1982-06-10 1986-03-04 Nippondenso Co., Ltd. Fuel injection pump having a compact spill-port timing control unit
GB8417861D0 (en) * 1984-07-13 1984-08-15 Lucas Ind Plc Fuel pumping apparatus
GB8417860D0 (en) * 1984-07-13 1984-08-15 Lucas Ind Plc Fuel injection pumping apparatus
GB8417862D0 (en) * 1984-07-13 1984-08-15 Lucas Ind Plc Fuel pumping apparatus
US4649884A (en) * 1986-03-05 1987-03-17 Walbro Corporation Fuel rail for internal combustion engines
GB2195266B (en) * 1986-09-17 1990-06-20 Philips Electronic Associated Liquid chromatograph apparatus including a proportioning arrangement.
EP0280923A3 (fr) * 1987-03-06 1989-02-22 WALBRO CORPORATION (Corporation of Delaware) Amortisseur de vibrations d'un collecteur dans un moteur
US4948346A (en) * 1989-05-18 1990-08-14 Walbro Corporation Fuel pump mount for reduction of vibration transmission
DE3928612A1 (de) * 1989-08-30 1991-03-07 Bosch Gmbh Robert Kraftstoffverteilereinspritzpumpe fuer brennkraftmaschinen
US5219277A (en) * 1990-05-29 1993-06-15 Walbro Corporation Electric-motor fuel pump
DE4137073A1 (de) * 1991-11-12 1993-05-13 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
US5354183A (en) * 1993-02-11 1994-10-11 Elasis Sistema Ricerca Fiat Nel Mezzogiorno Societa Consortile Per Azioni Pumping device with a main pumping stage and a supply pump
DE4315646A1 (de) * 1993-05-11 1994-11-17 Bosch Gmbh Robert Kraftstoffeinspritzpumpe für Brennkraftmaschinen
US5413468A (en) * 1993-11-23 1995-05-09 Walbro Corporation Pulse damper

Also Published As

Publication number Publication date
EP0795083A1 (fr) 1997-09-17
RU2156881C2 (ru) 2000-09-27
US5794594A (en) 1998-08-18
DE59600567D1 (de) 1998-10-22
WO1997008454A1 (fr) 1997-03-06
DE19531811A1 (de) 1997-03-06
JPH10508358A (ja) 1998-08-18

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