EP3039282B1 - Pumpe, insbesondere eine kraftstoffhochdruckpumpe - Google Patents

Pumpe, insbesondere eine kraftstoffhochdruckpumpe Download PDF

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Publication number
EP3039282B1
EP3039282B1 EP14742485.7A EP14742485A EP3039282B1 EP 3039282 B1 EP3039282 B1 EP 3039282B1 EP 14742485 A EP14742485 A EP 14742485A EP 3039282 B1 EP3039282 B1 EP 3039282B1
Authority
EP
European Patent Office
Prior art keywords
pump
low
pressure module
metering device
hollow cylindrical
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
EP14742485.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3039282A1 (de
Inventor
Jochen Aleker
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 EP3039282A1 publication Critical patent/EP3039282A1/de
Application granted granted Critical
Publication of EP3039282B1 publication Critical patent/EP3039282B1/de
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
    • F02M59/44—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
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • 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
    • F02M59/48—Assembling; Disassembling; Replacing
    • F02M59/485—Means for fixing delivery valve casing and barrel to each other or to pump casing

Definitions

  • the invention relates to a pump, in particular high-pressure fuel pump, according to the preamble of claim 1.
  • Such a pump in the form of a high-pressure fuel pump is through DE 10 2009 000 835 A1 known.
  • This pump has a housing part in which a pump piston is movably arranged in a cylinder bore, which delimits a pump working chamber in the cylinder bore.
  • the pump has an inlet valve which is arranged in the housing part and through which the pump working space can be connected to an inlet for conveying medium.
  • a metering device is provided, through which the pump working space supplied amount of conveying medium is variably adjustable.
  • the inlet partially runs through a low-pressure module, in which the metering device is arranged and which is connected to the housing part of the pump.
  • a connection for the inlet is arranged, which can lead, for example, from a feed pump to the low pressure module.
  • the inlet runs from the metering device in the low-pressure module through the housing part of the pump to the inlet valve arranged in the housing part.
  • the housing part of the pump has a subsequent to the cylinder bore hollow cylindrical projection, in which the inlet valve is arranged with the valve housing.
  • the low-pressure module has a recess into which protrudes the projection of the housing part, wherein the inlet from the metering device to the inlet valve in the hollow-cylindrical projection extends.
  • the valve housing of the inlet valve is pressed by a provided with a central opening screw ring into the hollow cylindrical projection of the housing part, so that the pump working space is sealed to the approach.
  • a space adjoining the projection is delimited, from which fuel can pass from the space to the inlet valve through bores extending from the central opening in the screw ring.
  • the pump according to the invention with the features of claim 1 has the advantage that it is simple, inexpensive and compact in size to produce, since the inlet to the inlet valve from the outer shell of the hollow cylindrical projection of the housing part arranged annulus takes place and the hollow cylindrical approach to the outside the screw plug is closed.
  • FIG. 1 a simplified representation of a pump in a longitudinal section with one of these associated low-pressure module according to a first embodiment
  • FIG. 2 the pump in a view in the direction of arrow II in FIG. 1
  • FIG. 3 the pump with the low pressure module according to a second embodiment.
  • a pump which is in particular a high-pressure fuel pump for a fuel injection device of an internal combustion engine.
  • the pump has a housing part 10, which is referred to below as the cylinder head.
  • the cylinder head 10 has a cylinder bore 12 in which a pump piston 14 is displaceably guided.
  • the pump piston 14 defines with its protruding into the cylinder bore 12 end of a pump working chamber 16.
  • the protruding from the cylinder bore 12 end of the pump piston 14 is connected to a transmission device, for example in the form of a roller tappet 20.
  • the roller tappet 20 is supported on a cam 22 of a drive shaft 24, through which a rotational movement of the pump piston 14 in the cylinder bore 12 is effected during the rotational movement of the drive shaft 24.
  • the drive shaft 24 may be part of the pump or part of the internal combustion engine, such as the camshaft or another shaft.
  • the pump working chamber 16 can be connected via an inlet valve 26 to a low-pressure inlet 27 to the pump and via an outlet valve 28 to a high-pressure outlet which leads, for example, to a high-pressure accumulator 30.
  • the low-pressure inlet 27 can be fed, for example, from a feed pump, which sucks fuel from a reservoir.
  • the inlet valve 26 has a valve housing 32 and is designed as a check valve.
  • the inlet valve 26 has a piston-shaped valve member 34, which is guided via its shaft 36 in the valve housing 32 and which cooperates with a formed at its diameter in relation to the shaft 36 enlarged head 38 sealing surface with a valve housing 32 formed on the valve seat.
  • the valve member 34 is acted upon by a closing spring 40 in the closing direction.
  • the cylinder head 10 is inserted in a receptacle 44 of a basic housing of the pump or a housing of the internal combustion engine, for example, the cylinder head or engine block, wherein the receptacle 44 is formed for example as a bore.
  • the cylinder head 10 in this case has a flange-like region 46, which has a larger cross section than the receptacle 44 and on which the receptacle 44 surrounding outside rests.
  • a projecting through the receptacle 44 extension 48 connects, in which the cylinder bore 12 extends and from which the connected to the roller tappet 20 end of the pump piston 14 protrudes.
  • a hollow cylindrical projection 50 connects to the cylinder head 10, which extends at least approximately coaxial with the cylinder bore 12.
  • valve housing 32 of the inlet valve 26 is inserted from the cylinder bore 12 facing away from the outside in the hollow cylindrical projection 50, wherein the valve housing 32 rests against an annular shoulder 52 of the cylinder head 10 formed at the transition from the cylinder bore 12 to the projection 50.
  • a closure screw 56 is inserted into the projection 50, which has an external thread which cooperates with an internal thread of the projection 50.
  • the valve housing 32 is pressed against the annular shoulder 52 to seal the pump working chamber 16 to the approach 50 out.
  • 52 may be disposed between the valve housing 32 and the annular shoulder a sealing ring.
  • the closure screw 56 has, on its inner side facing the valve housing 32, a central recess 58 in which the end of the shaft 36 of the valve member 34 projecting from the valve housing 32 and the closing spring 40 are arranged.
  • valve housing 32 Provided in the circumference of the valve housing 32 are at least one or preferably a plurality of inlet bores 60 distributed over the circumference, through which fuel enters the inlet valve 26.
  • the valve housing 32 is surrounded in the projection 50 by an annular groove 62, into which the inlet bores 60 open.
  • the annular groove 62 is connected to the outer periphery of the lug 50 via at least one bore 64 extending through the lug 50.
  • a nozzle 66 is formed, in which the outlet valve 28 is arranged. At the nozzle 66 to the memory 30 leading hydraulic line can be connected.
  • a low pressure module 70 is provided, through which the inlet 27 extends to the inlet valve 26.
  • the low-pressure module 70 has a module housing 72, which is connected to the cylinder head 10 and which is placed on the hollow cylindrical projection 50 of the cylinder head 10.
  • the module housing 72 is made of a lightweight material such as light metal such as aluminum or an aluminum alloy or plastic.
  • the module housing 72 has an approximately cylindrical shape, which is placed on the projection 50 of the cylinder head 10 and has a projection 50 receiving recess 74.
  • the module housing 72 bears against the flange-like region 46 of the cylinder head 10 and between the module housing 72 and the region 46 a sealing element 76, for example in the form of a sealing ring, is clamped.
  • the module housing 72 may, for example, be pressed onto the cylinder head 10 or fastened to the cylinder head 10 by means of a latching connection or via at least one or more screws.
  • Adjoining the recess 74 in the module housing 72 is an opening 78 into which a metering device 80 is inserted which serves to be able to variably set the amount of fuel supplied to the inlet valve 26.
  • the metering device 80 is designed, for example, as a proportional valve, by means of which flow cross sections of different sizes can be set.
  • the metering device 80 has a housing in which a piston 82 is arranged, through which the flow cross-section is set between an inlet opening into the metering device 80 and a drain discharging therefrom.
  • the piston 82 is displaceable against a spring 85 by means of an electrical actuator 84, for example an electromagnet. Depending on the position of the piston 82 are set by this differently sized flow cross sections.
  • the feed into the metering device 80 takes place at least approximately radially to the longitudinal axis 83 of the piston 82 and the drain at least approximately coaxial with the longitudinal axis 83 of the piston 82 of the metering device 80 and opens into the recess 74 of the module housing 72.
  • an annular space is formed between the outer periphery of the neck 50 of the cylinder head 10 and the recess 74 so that fuel from the recess 74 on the Bore 64 in approach 50 can reach the inlet valve 26.
  • an electrical terminal 81 is arranged for connection to an electronic control device, by which the actuator 84 is driven.
  • the metering device 80 When connected to the cylinder head 10 low-pressure module 70, the metering device 80 is arranged so that the longitudinal axis 83 of the piston 82 at least approximately coaxial with the cylinder bore 12 extends.
  • the module housing 72 has an at least approximately radially to the recess 74 outwardly projecting projection 86 with a bore 87.
  • a connecting piece 88 is inserted, for example, pressed.
  • a hydraulic line can be connected, which leads, for example, from a feed pump to the low-pressure module 70.
  • the bore 87 in the module housing 72 is connected via a further bore 89 with the metering device 80, wherein the further bore 89 opens in a surrounding the piston 82 of the metering device 80 annular space 90 in the module housing 72.
  • the annular space 90 and the bore 87 can be arranged offset to one another in the direction of the longitudinal axis 83 of the piston 82, so that the further bore 89 extends correspondingly obliquely in the module housing 72.
  • the pump fuel passes, for example, from a supply pump from a reservoir via the connecting piece 88 into the bore 87 in the module housing 72 and from there via the further bore 89 in the annular space 90. From the annular space 90 of the fuel passes through the piston 82 of the The coaxial arrangement of the piston 82 of the metering device 80 to the inlet valve 26, which in turn is coaxial with the cylinder bore 12 is arranged, a favorable inflow of the fuel is achieved. During the suction stroke of the pump piston 14, the inlet valve 26 opens, so that fuel flows into the pump working chamber 16.
  • the amount of fuel flowing into the pump working chamber 16 depends on the flow cross section set by the piston 82 of the metering device 80. If no fuel is to be delivered by the pump, the metering device 80 is closed so that it blocks the flow cross-section. If, due to leakage of the metering device, fuel still reaches the pump and is pumped through it, the excess fuel delivered can be discharged by suitable measures in the fuel injector.
  • an overflow valve are discharged by the pump from the pump too much subsidized fuel that is not supplied by the metering device 80 of the pump can.
  • the overflow valve is not arranged on the low pressure module 70, but for example on the feed pump.
  • the connecting piece 88 is arranged as the only hydraulic connection and the electrical connection 81 for the metering device 80 is provided. Other hydraulic connections, such as a return, are not provided.
  • the low-pressure module 70 can be placed in any rotational positions on the cylinder head 10 due to the circular cylindrical design of the projection 50 of the cylinder head 10, via the recess 74 and existing between this and the neck 50 of the cylinder head 10 annulus always a connection between the flow of the metering device 80 and the inlet valve 26 is present.
  • the pump is shown with the low pressure module 170 according to a second embodiment.
  • the cylinder head 10 of the pump is the same as in the first embodiment, but the low-pressure module 170 is formed differently and the metering device 180 is arranged differently.
  • the module housing 172 according to the second embodiment is flatter than in the first embodiment and has a flange 173 with an opening 174, wherein the module housing 172 is placed on the cylinder head 10 so that its opening 174 surrounds the projection 50 of the cylinder head 10. Laterally to the flange 173 then the module housing 172 has a projection 186, at the end in a bore 187 of the connecting piece 88 is used.
  • a further opening 178 is provided in the module housing 172, into which the metering device 80 is inserted.
  • the opening 178 is aligned with its longitudinal axis at least approximately parallel to the longitudinal axis of the opening 174.
  • the bore 187 is followed in the module housing 172 by a further bore 189, which opens into a piston 82 of the metering device 80 radially surrounding annular space 190.
  • a space 191 is formed, into which the outlet of the metering device 80 opens and which is connected to a bore 192 opening into the opening 174.
  • an annular space is formed between the projection 50 and the opening 174 in the flange 173 of the module housing 172.
  • a sealing element 76 is arranged between the flange 173 of the module housing 172 and the flange-like region 46 of the cylinder head 10.
  • a sealing element 193 for example in the form of a sealing ring arranged above the bore 64 in the projection 50 of the cylinder head 10 between the projection 50 and the opening 174 of the flange 173, a sealing element 193, for example in the form of a sealing ring arranged above the bore 64 in the projection 50 of the cylinder head 10 between the projection 50 and the opening 174 of the flange 173, a sealing element 193, for example in the form of a sealing ring arranged.
  • a sealing element 194 for example in the form of a sealing ring, is arranged between the closure screw 56 and the inner jacket of the extension 50.
  • the low-pressure module 170 can be connected as a result of the circular cylindrical design of the projection 50 of the cylinder head 10 in any rotational positions with the cylinder head 10. Irrespective of the rotational position of the low-pressure module 70, a connection between the bore 192 of the module housing 172 with the bore 64 of the projection 50 and thus with the inlet valve 26 is always present via the annular space present between the projection 50 and the opening 174 of the flange 173.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Details Of Reciprocating Pumps (AREA)
EP14742485.7A 2013-08-30 2014-07-17 Pumpe, insbesondere eine kraftstoffhochdruckpumpe Not-in-force EP3039282B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201310217357 DE102013217357A1 (de) 2013-08-30 2013-08-30 Pumpe, insbesondere eine Kraftstoffhochdruckpumpe
PCT/EP2014/065390 WO2015028196A1 (de) 2013-08-30 2014-07-17 Pumpe, insbesondere eine kraftstoffhochdruckpumpe

Publications (2)

Publication Number Publication Date
EP3039282A1 EP3039282A1 (de) 2016-07-06
EP3039282B1 true EP3039282B1 (de) 2019-02-27

Family

ID=51224919

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14742485.7A Not-in-force EP3039282B1 (de) 2013-08-30 2014-07-17 Pumpe, insbesondere eine kraftstoffhochdruckpumpe

Country Status (5)

Country Link
EP (1) EP3039282B1 (ja)
JP (1) JP6175567B2 (ja)
CN (1) CN105492756B (ja)
DE (1) DE102013217357A1 (ja)
WO (1) WO2015028196A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11713755B2 (en) 2016-07-08 2023-08-01 Delphi Technologies Ip Limited High-pressure fuel pump

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009000835A1 (de) * 2009-02-13 2010-08-19 Robert Bosch Gmbh Modulare Niederdruckeinheit und modulare Pumpenanordnung

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69720603T2 (de) * 1996-07-05 2004-03-04 Nippon Soken, Inc., Nishio Hochdruckpumpe
JP2003120468A (ja) * 2001-10-15 2003-04-23 Bosch Automotive Systems Corp 燃料液流量調節弁、及び該燃料液流量調節弁を備えた内燃機関の燃料噴射システム
JP4221760B2 (ja) * 2005-01-17 2009-02-12 株式会社デンソー 高圧燃料ポンプ
DE102006061558A1 (de) * 2006-12-27 2008-07-03 Robert Bosch Gmbh Kraftstoff-Fördereinrichtung für eine Brennkraftmaschine
DE102007038984A1 (de) * 2007-08-17 2009-02-19 Robert Bosch Gmbh Kraftstoffpumpe für ein Kraftstoffsystem einer Brennkraftmaschine
US7677872B2 (en) * 2007-09-07 2010-03-16 Gm Global Technology Operations, Inc. Low back-flow pulsation fuel injection pump
JP4985476B2 (ja) * 2008-03-04 2012-07-25 株式会社デンソー 燃料供給ポンプの逆止弁
GB0812888D0 (en) * 2008-07-15 2008-08-20 Delphi Tech Inc Improvements relating to fuel pumps
JP2010112304A (ja) * 2008-11-07 2010-05-20 Bosch Corp 燃料供給ポンプ
DE102009000857A1 (de) * 2009-02-13 2010-08-19 Robert Bosch Gmbh Pumpenanordnung
JP5187255B2 (ja) * 2009-03-27 2013-04-24 株式会社デンソー 高圧ポンプ
DE102011087701A1 (de) 2011-12-05 2013-06-06 Robert Bosch Gmbh Niederdruckeinheit für eine Pumpe, insbesondere eine Kraftstoffhochdruckpumpe einer Kraftstoffeinspritzeinrichtung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009000835A1 (de) * 2009-02-13 2010-08-19 Robert Bosch Gmbh Modulare Niederdruckeinheit und modulare Pumpenanordnung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11713755B2 (en) 2016-07-08 2023-08-01 Delphi Technologies Ip Limited High-pressure fuel pump

Also Published As

Publication number Publication date
JP6175567B2 (ja) 2017-08-02
CN105492756B (zh) 2019-03-08
DE102013217357A1 (de) 2015-03-05
JP2016532815A (ja) 2016-10-20
EP3039282A1 (de) 2016-07-06
CN105492756A (zh) 2016-04-13
WO2015028196A1 (de) 2015-03-05

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