EP3430261B1 - Pompe à haute pression ayant un amortisseur fluidique de pulsations - Google Patents

Pompe à haute pression ayant un amortisseur fluidique de pulsations Download PDF

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Publication number
EP3430261B1
EP3430261B1 EP17701506.2A EP17701506A EP3430261B1 EP 3430261 B1 EP3430261 B1 EP 3430261B1 EP 17701506 A EP17701506 A EP 17701506A EP 3430261 B1 EP3430261 B1 EP 3430261B1
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EP
European Patent Office
Prior art keywords
pump
chamber
pressure
pressure pump
damper
Prior art date
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Application number
EP17701506.2A
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German (de)
English (en)
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EP3430261A1 (fr
Inventor
Daniel Keilbach
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
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Robert Bosch GmbH
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Publication of EP3430261A1 publication Critical patent/EP3430261A1/fr
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Classifications

    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • 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
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • 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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
    • F04B11/0016—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators with a fluid spring
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0041—Means for damping pressure pulsations

Definitions

  • the invention relates to a high-pressure pump, having a pump housing on which a pump cylinder head having a pump cylinder is arranged, with a pump tappet being arranged in a pump cylinder guide of the pump cylinder, which interacts with a pump working chamber that can be filled with fluid, with the pump working chamber being able to be filled with fluid via an electromagnetically actuatable suction valve and the high pressure pump includes a fluid damper.
  • Such a high-pressure pump is from DE 10 2010 063 589 A1 known.
  • This high pressure pump is part of a fuel injection system of an internal combustion engine.
  • This high-pressure pump has a pump housing on which a pump cylinder head having a pump cylinder is arranged, which forms the pump housing, a pump tappet for pumping the fuel being arranged in a pump cylinder guide of the pump cylinder.
  • a pump working chamber is arranged adjacent to the pump cylinder guide, to which fuel can be supplied via an electromagnetically actuable suction valve.
  • the high-pressure pump has a fluid damper which is arranged in a damper chamber of the pump cylinder head.
  • the high-pressure pump also has an engine, which is arranged in an engine room, in which oil is present for lubrication. There is an oil seal between the pump tappet and the engine compartment to prevent the oil from mixing with the fuel delivered by the high-pressure pump. Fuel is supplied to the damper chamber via an inlet connection on the pump cylinder head supplied and fed from this via the electromagnetically actuated suction valve to the pump working chamber. Because of the different media, oil in the machine room and fuel in the pump working room, the pump working room must not have any connection with the machine room. In the case of the known high-pressure pump, therefore, only pressure fluctuations and pulsations in the inlet to the suction valve can be reduced.
  • the object of the invention is to provide a high-pressure pump in which the fluid damper is advantageously integrated in the pump housing and pressure fluctuations and pulsations occurring in the engine compartment are also damped.
  • the damper chamber is thus arranged in a space-saving manner next to the inlet connection and the fluid damper reduces pressure fluctuations and pulsations in the drive mechanism chamber, through which the inlet to the pump working chamber runs.
  • the fluid damper is a membrane.
  • This membrane is ring-shaped or cylindrical and has two opposing annular end faces which enclose an inner membrane chamber and can be moved in relation to one another.
  • Such a membrane is known in principle and can be made of a metallic material, for example.
  • the diaphragm chamber is thus formed between the two opposite end faces and is filled with a gas, for example.
  • the membrane is acted upon on both sides by the fluid pressure prevailing in the damper chamber.
  • This enables the membrane to work ideally, in that the pressure curves on both sides of the membrane are synchronous.
  • the end faces are pressurized in the longitudinal direction or parallel to the end faces. This has a positive effect on the function and durability of the membrane.
  • At least two membranes are arranged in the damper chamber.
  • This configuration can be easily implemented by the damper chamber let into the pump housing, the arrangement being aligned in relation to the inlet connection—as explained—that the membrane is arranged longitudinally to the direction of pulsation propagation and not transversely to it, as was previously the case. This reduces the stress acting on the membrane. As a result, the service life of the membrane installed in this way is increased, as a result of which the service life of the high-pressure pump or a maintenance interval for the high-pressure pump is increased or lengthened.
  • the damper chamber is arranged between the engine chamber and a tappet chamber connection or the tappet chamber below the pump cylinder head. This dampens the two main sources of pulsation, which are triggered by the high-pressure pump.
  • the at least one membrane can be inserted into a membrane holder which can be installed in the damper chamber.
  • a membrane holder which can be installed in the damper chamber.
  • the damper chamber has an assembly opening that can be covered by a chamber cover.
  • This assembly opening is arranged on the high-pressure pump in such a way that it can also be reached when the high-pressure pump is fully equipped with add-on parts. This means that the damper chamber can be reached without dismantling the high-pressure pump.
  • the chamber cover can, for example, be screwed to the pump housing by inserting a sealing ring.
  • the drive mechanism chamber and the damper chamber are both connected via connecting channels to a tappet chamber below the pump cylinder head.
  • This configuration can be implemented in a favorable manner in terms of design and production technology and also offers the advantage that the direct connection of the components to one another results in advantages with regard to the damping of pressure fluctuations or pressure pulsations of the fluid to be conveyed.
  • the high-pressure pump designed as a high-pressure fuel pump is part of a fuel injection system of an internal combustion engine, the fuel injection system being designed as a common rail fuel injection system, for example, and being designed for injecting fuel, for example diesel fuel or gasoline, into a combustion chamber of the internal combustion engine.
  • figure 1 shows a perspective view of a high-pressure pump, which is designed as a high-pressure fuel pump 1 of a fuel injection system.
  • the fuel injection system is installed on an internal combustion engine and the high-pressure fuel pump delivers fuel from a low-pressure fuel system at a delivery pressure of up to 3,000 bar, for example, into a high-pressure accumulator connected to the high-pressure fuel pump 1 via a high-pressure line, from which the fuel stored there is taken from fuel injectors for controlled injection into the assigned Combustion chambers of the internal combustion engine is removed.
  • the fuel is diesel fuel, for example, and the internal combustion engine is a self-igniting internal combustion engine.
  • the high-pressure fuel pump has a pump housing 2 on which a pump cylinder 3 (see also figure 2 ) Having pump cylinder head 4 is mounted.
  • the pump cylinder head 4 has a high-pressure connection 5 for connection to the high-pressure line.
  • an electrically operated suction valve 6 is installed in the pump cylinder head 4, to which reference is made to FIG figure 2 will be dealt with below.
  • the suction valve 6 has a connector plug 7 for the electrical connection to an electronic control device.
  • the pump housing 2 In the pump housing 2 is on off figure 2 visible engine room 8 embedded in which a camshaft 10 having a double cam 9 is rotatably mounted.
  • the engine chamber 8 is closed off from the environment by a pump housing cover 11, through which a drive cone 12 of the camshaft 10 protrudes.
  • a drive gear On the drive cone 12, for example, a drive gear is mounted in a rotationally fixed manner, which is set in rotation by a drive shaft, for example, of the internal combustion engine during operation of the same.
  • the pump housing 2 also has an inlet connection 13 and a return connection 14 .
  • the inlet connection 13 is connected to the low-pressure fuel system via a pressure-resistant inlet hose, for example, while the return connection 14 is connected to a fuel tank, for example, via a return hose.
  • the chamber cover 15 closes a mounting opening 18 of a damper chamber 19, which is also explained below.
  • FIG figure 2 shows a longitudinal section through the high-pressure fuel pump 1 according to FIG figure 1 , It being evident from this representation that the pump cylinder 3 of the pump cylinder head 4 protrudes into a plunger chamber 20 in the pump housing 2 .
  • a roller tappet 21 is inserted in the cylindrical tappet chamber 20, which rolls with a roller 22 on the double cam 9 of the camshaft 10 arranged in the engine compartment 8 during a rotary movement of the camshaft 10 and thus the roller tappet 21 in the Plunger space 20 moves translationally up and down.
  • a tappet spring 23 is arranged in the tappet chamber 20, which is clamped between the pump cylinder head 4 and a retaining disk 24, which is arranged inside the roller tappet 21 .
  • the retaining disk 24 rests on an inner ring contact surface 25 of the roller tappet 21 and at the same time holds a pump tappet 26, which can be moved translationally in a pump cylinder guide 27 embedded in the pump cylinder 3, with a pump tappet foot 28 against a roller holder 29 of the roller tappet 21.
  • the inlet connection 13 (see also figure 3 ) is via an inlet channel 30 (see also figure 5 ) connected to engine room 8.
  • the engine chamber 8 is in turn connected to the damper chamber 19 and both are connected to the tappet chamber 20 below the pump cylinder head 4 via connecting channels 31a, 31b.
  • the connecting channel 31a has an extension 32 ( figure 2 ) which ends in a contact surface 33 of the pump housing 2 for contacting the pump cylinder head 4 .
  • the extension 32 continues in a supply channel 34 which is let into the pump cylinder head 4 and is in communication with the electromagnetically actuated suction valve 6 .
  • the electromagnetically actuated suction valve 6 has an inlet valve 35 actuated by it, which in the open state connects the supply channel 34 to a pump work chamber 36, which is arranged as an extension of the pump cylinder guide 27 above the pump tappet 26 in the pump cylinder head 4. Consequently, when the inlet valve 35 is open, fuel supplied via the inlet connection 13 is introduced into the pump working chamber 36 when the pump tappet 26 moves downwards and is pushed back into the low-pressure fuel system during a subsequent upward movement of the pump tappet 26 along the same path with the inlet valve 35 open.
  • a return channel 43 is also shown, which is connected to the return connection 14 and, for example, through the pump housing 2 and the pump housing cover 11 arranged bearing for supporting the camshaft 10 for cooling and lubrication recirculates fuel passed back into the low-pressure system or the tank.
  • the fluid damping device is installed in the damper chamber 19, with reference to the figures 2 , 3 and 4 is explained below.
  • the fluid damping device has two membranes 38a, 38b, which are inserted into a membrane holder 40, preferably designed as a stamped and bent part, with the insertion of a membrane spring 39, which is made, for example, of spring steel.
  • the membrane holder 40 pre-assembled in this way is evident from the figure 4 introduced into the damper chamber 19 via the assembly opening 18 and then the chamber cover 15 is screwed to the pump housing 2 by means of the screws 17 with the insertion of the sealing ring 16 .
  • the membranes 38a, 38b are ring-shaped or cylindrical and have an inner membrane chamber 41 which is filled with a medium, for example with a compressible gas. If a force acts on the two opposite annular end faces 42 of the two membranes 38a, 38b, the two end faces 42 are deformed inwards into the membrane chamber 41. This effect is used to dampen the pressure fluctuations or pressure pulsations prevailing in the high-pressure fuel pump 1 .

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  • 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 (10)

  1. Pompe à haute pression, comportant un boîtier de pompe (2) sur lequel est disposée une culasse de pompe (4) qui comporte un cylindre de pompe (3), un plongeur de pompe (26), qui coopère avec un compartiment de travail de pompe (36), étant disposé dans un guide de cylindre de pompe (27) du cylindre de pompe (3), le compartiment de travail de pompe (36) pouvant être rempli avec un fluide par le biais d'une soupape d'aspiration (6) à commande électromagnétique et la pompe à haute pression comportant un amortisseur à fluide qui est inséré dans une chambre d'amortisseur (19) qui débouche dans le boîtier de pompe (2), caractérisée en ce qu'un compartiment de turbine (8) est disposé dans le boîtier de pompe (2), en ce que le compartiment de travail de pompe (36) peut être relié fluidiquement au compartiment de turbine (8) par le biais de la soupape d'aspiration (6) à commande électromagnétique, en ce que la chambre d'amortisseur (19) est reliée au compartiment de turbine (8) et en ce que la chambre d'amortisseur (19) est disposée latéralement à côté d'un raccord d'admission (13) du boîtier de pompe (2) qui est destiné alimenter le compartiment de turbine (8) en fluide à transporter par la pompe à haute pression.
  2. Pompe à haute pression selon la revendication 1, caractérisée en ce que l'amortisseur à fluide est au moins une membrane (38a, 38b).
  3. Pompe à haute pression selon la revendication 2,
    caractérisée en ce que la membrane (38a, 38b) comporte une chambre de membrane intérieure (41) remplie de milieu.
  4. Pompe à haute pression selon la revendication 2 ou 3,
    caractérisée en ce que la membrane (38a, 38b) est pressurisée des deux côtés par la pression de fluide régnant dans la chambre d'amortisseur (19).
  5. Pompe à haute pression selon la revendication 4,
    caractérisée en ce que la membrane (38a, 38b) est pressurisée parallèlement à ses faces frontales opposées (42).
  6. Pompe à haute pression selon l'une des revendications 2 à 5,
    caractérisée en ce qu'au moins deux membranes (38a, 38b) sont insérées dans la chambre d'amortisseur (19) parallèlement l'une à l'autre.
  7. Pompe à haute pression selon l'une des revendications 2 à 6, caractérisée en ce que la membrane (38a, 38b) est insérée dans un support de membrane (40) qui peut être inséré dans la chambre d'amortisseur (19).
  8. Pompe à haute pression selon l'une des revendications précédentes,
    caractérisée en ce que la chambre d'amortisseur (19) comporte une ouverture de montage (18) qui peut être recouverte par un couvercle de chambre (15).
  9. Pompe à haute pression selon l'une des revendications précédentes, caractérisée en ce que le compartiment de turbine (8) et la chambre d'amortisseur (19) sont tous deux reliés par des canaux de liaison (31a, 31b) à un compartiment de piston (20) situé au-dessous de la culasse de pompe (4).
  10. Système d'injection de carburant comprenant une pompe à haute pression selon l'une des revendications précédentes qui est conçue comme une pompe à carburant à haute pression (1).
EP17701506.2A 2016-03-14 2017-01-26 Pompe à haute pression ayant un amortisseur fluidique de pulsations Active EP3430261B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016204128.2A DE102016204128A1 (de) 2016-03-14 2016-03-14 Hochdruckpumpe
PCT/EP2017/051651 WO2017157554A1 (fr) 2016-03-14 2017-01-26 Pompe haute pression comprenant un amortisseur de fluide

Publications (2)

Publication Number Publication Date
EP3430261A1 EP3430261A1 (fr) 2019-01-23
EP3430261B1 true EP3430261B1 (fr) 2022-01-26

Family

ID=57890837

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17701506.2A Active EP3430261B1 (fr) 2016-03-14 2017-01-26 Pompe à haute pression ayant un amortisseur fluidique de pulsations

Country Status (5)

Country Link
EP (1) EP3430261B1 (fr)
KR (1) KR20180121982A (fr)
CN (1) CN108779766B (fr)
DE (1) DE102016204128A1 (fr)
WO (1) WO2017157554A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017213891B3 (de) 2017-08-09 2019-02-14 Continental Automotive Gmbh Kraftstoffhochdruckpumpe für ein Kraftstoffeinspritzsystem
DE102018001129A1 (de) 2018-02-12 2019-08-14 Daimler Ag Kraftstoffhochdruckpumpe für eine Verbrennungskraftmaschine eines Kraftfahrzeugs, insbesondere eines Kraftwagens

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW384358B (en) * 1997-09-25 2000-03-11 Mitsubishi Electric Corp High pressure fuel supply pump body for an in-cylinder fuel injection engine
EP1411236B1 (fr) * 2002-10-19 2012-10-10 Robert Bosch Gmbh Dispositif pour l'atténuation des pulsations de pression dans un système de fluide, en particulier dans un système de carburant d'un moteur à combustion interne
JP2008057451A (ja) * 2006-08-31 2008-03-13 Hitachi Ltd 高圧燃料供給ポンプ
JP5051279B2 (ja) * 2009-12-21 2012-10-17 株式会社デンソー 定残圧弁
US8727752B2 (en) * 2010-10-06 2014-05-20 Stanadyne Corporation Three element diaphragm damper for fuel pump
JP5628121B2 (ja) * 2011-09-20 2014-11-19 日立オートモティブシステムズ株式会社 高圧燃料供給ポンプ
DE102013207393A1 (de) 2013-04-24 2014-10-30 Robert Bosch Gmbh Kolbenpumpe, insbesondere Hochdruckpumpe für ein Kraftstoffsystem für eine Brennkraftmaschine

Also Published As

Publication number Publication date
KR20180121982A (ko) 2018-11-09
CN108779766B (zh) 2020-07-17
WO2017157554A1 (fr) 2017-09-21
CN108779766A (zh) 2018-11-09
EP3430261A1 (fr) 2019-01-23
DE102016204128A1 (de) 2017-09-14

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