EP1834089A1 - Pompe a piston, notamment pompe a carburant haute pression destinee a un moteur a combustion interne - Google Patents

Pompe a piston, notamment pompe a carburant haute pression destinee a un moteur a combustion interne

Info

Publication number
EP1834089A1
EP1834089A1 EP05797277A EP05797277A EP1834089A1 EP 1834089 A1 EP1834089 A1 EP 1834089A1 EP 05797277 A EP05797277 A EP 05797277A EP 05797277 A EP05797277 A EP 05797277A EP 1834089 A1 EP1834089 A1 EP 1834089A1
Authority
EP
European Patent Office
Prior art keywords
piston
piston pump
pump
working space
housing
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
EP05797277A
Other languages
German (de)
English (en)
Other versions
EP1834089B1 (fr
Inventor
Heinz Siegel
Thomas Jakisch
Siamend Flo
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 EP1834089A1 publication Critical patent/EP1834089A1/fr
Application granted granted Critical
Publication of EP1834089B1 publication Critical patent/EP1834089B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • F04B1/0408—Pistons

Definitions

  • Piston pump in particular high-pressure fuel pump for an internal combustion engine
  • the invention relates to a piston pump, in particular a fuel pump high-pressure pump for an internal combustion engine, with a housing and with a piston which defines a working space and has a pointing away from the working space paragraph.
  • a piston pump of the type mentioned is known from DE 101 34 066 Al.
  • the piston can be offset by an eccentric shaft in a reciprocating motion.
  • the piston has a region with a larger diameter and a region with a smaller diameter, wherein the region of larger diameter is in the installed position adjacent to the working space.
  • the piston is guided in the known pump with the larger diameter region directly in the housing and inserted with this area ahead of the working space forth in the housing.
  • the opening through which the piston is inserted into the housing is closed by a quantity control valve after insertion of the piston.
  • Object of the present invention is to provide a piston pump of the type mentioned in such a way that it can be made faster and easier.
  • the piston can be introduced with the working space end in front of the housing, the piston can be inserted through the same opening in which it is later performed in operation in the housing. An additional opening for the assembly of the piston can thus be omitted.
  • This increases the freedom in the design of the piston pump, reduces the cost of the housing, and reduces assembly costs.
  • the pump can therefore be supplied in preassembled state to the manufacturer of the internal combustion engine. This simplifies storage, transport and integration into the internal combustion engine.
  • the shoulder is formed by an annular step on the piston.
  • Such a stepped piston can be easily and inexpensively manufactured.
  • the proposed annular step on the piston still has the advantage that in this area, the piston pump can build a total of smaller, which further facilitates their installation in the engine.
  • the annular step delimits a compensation chamber which is fluidically separated from the working chamber and which is connected to a region of an inlet-side volume control valve remote from the working chamber.
  • a pressure damper is arranged between the equalization chamber and the quantity control valve in such a piston pump. Due to the presence of the compensation chamber of the pressure damper can build smaller, which contributes to a total reduction of the dimensions of the piston pump according to the invention. Due to the compensation volume provided in the compensation room In addition, pressure peaks, which can occur in the event of failure of the pressure damper, are reduced. As a result, the inlet side parts of the piston pump and also a low pressure system connected to the inlet of the piston pump can be designed for maximum pressures, which also contributes to simplification and cost reduction.
  • the hydraulically effective area of the annular step is approximately half the size of the hydraulically effective area of the piston projecting into the working space. "About half the size” includes a range of 40-60% of the hydraulic effective area of the piston projecting into the working space.
  • Piston pump provides that the stop element comprises a coaxial with the piston sleeve part with a radially inner region on which the stopper is formed.
  • a sleeve part can be produced inexpensively, for example, as a sheet metal part.
  • the stop element may comprise a sleeve part which is coaxial with the piston and which has an axially extending fastening section on a radially outer region, on which the sleeve part is connected to the housing, preferably pressed in and / or welded.
  • the attachment of the stop element is moved to the housing in a radially comparatively far outboard area, which is at most far away from the piston and the piston seal.
  • the risk of damage to these sensitive parts during assembly or manufacture of the piston pump according to the invention is thus reduced. This is especially true for attachment of the stop element to the housing by a weld, in the production of which welding spatter can occur and In addition, there may be a delay of lying in the vicinity of the weld components.
  • a particularly advantageous embodiment of the piston pump according to the invention is characterized in that it comprises a housing-fixed piston seal, which rests against a lateral surface of the piston and a conveying region separated from a drive region, and that the piston seal is held by a holding portion of the stop element.
  • the stop element thus has a dual function, namely it additionally holds the piston seal.
  • the stop element may comprise a first sleeve part on which the stopper is present, and a second sleeve part which holds the piston seal.
  • the holding section comprises a receiving chamber, in which the piston seal is accommodated, and which is formed between the first sleeve part and the second sleeve part.
  • a receiving chamber allows a simple and safe and beyond a protected mounting of the piston seal.
  • a simple joining method for the two sleeve parts is that they are pressed together.
  • This pre-assembled assembly is postponed after insertion of the piston in the guide opening of the housing on the piston as a whole, whereby assembly time is saved.
  • the piston spring can be placed and then attached to the end remote from the working space of the piston, a spring plate, for example by a press connection.
  • the piston can be pressed with its working space end against the opposite boundary wall of the working space without the risk of damage, for example, a quantity control valve.
  • Figure 1 is a schematic representation of a
  • Figure 2 is a partial section through the piston pump of Figure l;
  • Figure 3 is a section through an assembly of the piston pump of Figure 1;
  • Figure 4 is a first schematic diagram for explaining the operation of the piston pump of Figure 1;
  • FIG. 5 shows a second basic illustration for explaining the mode of operation of the piston pump from FIG. 1.
  • a fuel system in FIG. 1 bears the whole
  • Reference numeral 10 It comprises a fuel tank 12, from which a prefeed pump 14 conveys the fuel to a high-pressure fuel pump 16 designed as a piston pump. This compresses the fuel to a very high pressure and conveys it to a fuel rail 18, to which a plurality of injectors 20 are connected. These inject the fuel directly into their associated combustion chambers 22 a.
  • the piston pump 16 is mechanically driven by the internal combustion engine, as indicated by the connection 24. To control the Flow rate of the piston pump 16 includes this inlet side a quantity control valve 26th
  • the piston pump 16 is shown in greater detail in FIG. 2. Thereafter, it comprises an overall approximately cylindrical housing 28, which is closed in FIG. 2 at the top by a cover 30. As will be explained below, a pressure damper not visible in FIG. 2 is arranged under the cover. In Figure 2 from below a stepped bore 32 is introduced into the housing 28, in which a piston sleeve 34 is inserted. In the latter, in turn, a piston 36 is guided axially displaceable with very little play.
  • Staged bore 32 define a working space 38 into which the fuel passes from the side of the housing 28 arranged quantity control valve 26 during an intake stroke via an inlet 40. During a compression stroke of the piston 36, the fuel is expelled from the working space 38 via an outlet 42 to the fuel rail 18.
  • the piston 36 is designed as a stepped piston with a working space 38 toward the area 44 with a larger diameter and a remote from the working space 38
  • an assembly 58 shown in greater detail in FIG. 3 is mounted on the housing 28, which comprises a stop element 60 and a piston seal 62, from the end of the piston 36 facing away from the working space 38.
  • the stop element 60 in turn consists of a first sleeve part 64 and a second sleeve part 66. Both sleeve parts 64 and 66 and the piston seal 62 are arranged coaxially with the piston 36.
  • the piston seal 62 rests in the installed position on the lateral surface of the piston 36 and separates a fuel-side delivery region 68 from a motor oil-side drive region 70 (see FIG. 2).
  • the first sleeve part 64 comprises a radially inner and tubular axially extending inner portion 72, a radially extending central portion 74, which is integrally formed on the working space 38 and the conveying area 68 towards the end of the inner portion 72, and a radially outwardly to the central portion 74 formed outer portion 76 which extends in the axial direction to the drive portion 70 through.
  • the second sleeve part 66 comprises an annular and radially inner inner portion 78, a radially outwardly formed on the inner portion 78 central portion 80 which extends in the axial direction of the working space 38 and the conveying region 68 and an integrally formed on the central portion 80 outer portion 82, which extends radially outward.
  • the outer diameter of the central portion 80 of the second sleeve portion 66 and the inner diameter of the inner portion 72 of the first sleeve portion 64 are at least partially coordinated so that the inner portion 78 and the central portion 80 of the second sleeve portion 66 are held by a press fit within the first sleeve portion 64.
  • a short, radially inwardly directed turn 84 is present at the free end of the inner portion 72 of the first sleeve portion 64 facing away from the working space 38 and from the conveying area 68.
  • This bend 84 together with a region of the inner portion 72 of the first sleeve part 64 and the inner portion 78 of the second sleeve part 66, forms a holding portion for the piston seal 62 in the form of an annular receiving chamber 86.
  • Piston 36 postponed The outside of the outer portion 76 of the first sleeve part 64 is then pressed in 88 and welded to the connection piece 50 of the housing 28. Now, a piston spring 90 is mounted, the diameter of which is selected so that it is supported axially at one end to the inner portion 72 of the first sleeve portion 64 adjacent region of the central portion 74. The portion of the inner portion 72 adjacent to the central portion 74 has a slightly increased diameter, by which the piston spring 90 is centered without its free mobility being restricted by the inner portion 72 as a whole.
  • Channel 100 further connected to a remote from the working space 38 portion of the quantity control valve.
  • the function of the compensation chamber 94 results from FIGS. 4 and 5: During a suction stroke (FIG. 4), the piston 36 moves in the direction of the arrow 102.
  • the combined intake and quantity control valve 26 flows fuel from the pressure damper 98 and from the compensation chamber 94 the channel 96 in the working space 38.
  • the Pressure damper 98 connected via a channel 104 to the outlet of the feed pump 14.
  • piston 36 moves in the direction of arrow 106.
  • the fuel trapped in working chamber 38 is compressed and expelled via outlet 42 to fuel rail 18 with the intake / quantity control valve 26 and exhaust valve 108 open.
  • the inlet / quantity control valve 26 is opened during the compression stroke, whereby high-pressure fuel flows out of the working space 38 in accordance with the arrows 110.
  • a resulting pressure pulsation is reduced on the one hand by the pressure damper 98, on the other hand, the outflowing fuel volume is also absorbed by the volume of the expansion chamber 94 which increases during a compression stroke.
  • the corresponding stroke volume in the compensation chamber 94 is determined by the area of the shoulder 48 between the two regions 44 and 46 of the piston 36. It is indicated in FIG. 5 by a dot-dash line 112 and amounts to approximately 40-60% of the stroke volume in the working space 38 (reference number 114 in FIG. 4).
  • the filling of the working space 38 is supported during the suction stroke by the decreasing volume of the compensation chamber 94. This leads to an improvement of the dynamics and also of the efficiency of the piston pump 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

L'invention concerne une pompe à piston (16), notamment une pompe à carburant haute pression destinée à un moteur à combustion interne, comportant un boîtier (28) et un piston (36) délimitant un espace de travail (38) et présentant une saillie (48) opposée à l'espace de travail (38). Selon l'invention, le piston (38) est introduit dans le boîtier (28), l'extrémité côté espace de travail en premier, et le boîtier (28) comporte une butée (60) présentant une zone de butée (78) interagissant au moins temporairement avec la saillie (48).
EP05797277A 2004-12-28 2005-10-05 Pompe a piston, notamment pompe a carburant haute pression destinee a un moteur a combustion interne Active EP1834089B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004063075.5A DE102004063075B4 (de) 2004-12-28 2004-12-28 Kraftstoff-Hochdruckpumpe für eine Brennkraftmaschine mit einem Stufenkolben und einem Mengensteuerventil
PCT/EP2005/055002 WO2006069818A1 (fr) 2004-12-28 2005-10-05 Pompe a piston, notamment pompe a carburant haute pression destinee a un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1834089A1 true EP1834089A1 (fr) 2007-09-19
EP1834089B1 EP1834089B1 (fr) 2012-12-12

Family

ID=35520962

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05797277A Active EP1834089B1 (fr) 2004-12-28 2005-10-05 Pompe a piston, notamment pompe a carburant haute pression destinee a un moteur a combustion interne

Country Status (6)

Country Link
EP (1) EP1834089B1 (fr)
JP (1) JP4664989B2 (fr)
CN (1) CN101094988B (fr)
DE (1) DE102004063075B4 (fr)
ES (1) ES2395942T3 (fr)
WO (1) WO2006069818A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150017041A1 (en) * 2008-04-25 2015-01-15 Hitachi, Ltd., Mechanism for Restraining Fuel Pressure Pulsation and High Pressure Fuel Supply Pump of Internal Combustion Engine with Such Mechanism

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JP4215000B2 (ja) * 2005-01-19 2009-01-28 株式会社デンソー 高圧ポンプ
US7677872B2 (en) 2007-09-07 2010-03-16 Gm Global Technology Operations, Inc. Low back-flow pulsation fuel injection pump
JP4736142B2 (ja) 2009-02-18 2011-07-27 株式会社デンソー 高圧ポンプ
IT1396143B1 (it) * 2009-11-03 2012-11-16 Magneti Marelli Spa Pompa carburante con ridotta usura di una guarnizione per un sistema di iniezione diretta
JP4941688B2 (ja) 2009-11-09 2012-05-30 株式会社デンソー 高圧ポンプ
JP5136919B2 (ja) 2010-04-08 2013-02-06 株式会社デンソー 高圧ポンプ
JP5352646B2 (ja) 2011-01-27 2013-11-27 株式会社日本自動車部品総合研究所 高圧ポンプ
CN102619660B (zh) * 2011-01-28 2015-06-24 株式会社电装 高压泵
JP5319713B2 (ja) * 2011-01-28 2013-10-16 株式会社デンソー 高圧ポンプ
JP5668978B2 (ja) * 2011-02-25 2015-02-12 株式会社デンソー 高圧ポンプ
JP5703893B2 (ja) * 2011-03-28 2015-04-22 株式会社デンソー 高圧ポンプ
JP5673284B2 (ja) * 2011-03-28 2015-02-18 株式会社デンソー 高圧ポンプ
JP5382551B2 (ja) 2011-03-31 2014-01-08 株式会社デンソー 高圧ポンプ
JP2013050081A (ja) * 2011-08-31 2013-03-14 Denso Corp 高圧ポンプ
DE102012201240B4 (de) 2012-01-30 2023-03-16 Bayerische Motoren Werke Aktiengesellschaft Dichtung für Kraftstoffpumpe
WO2014095120A1 (fr) * 2012-12-20 2014-06-26 Robert Bosch Gmbh Pompe à carburant alternative pour moteur à combustion interne
DE102013200455A1 (de) 2013-01-15 2014-07-17 Robert Bosch Gmbh Kolbenpumpe, insbesondere Kraftstoffpumpe für ein Kraftstoffsystem für eine Brennkraftmaschine
DE102013205909A1 (de) * 2013-04-04 2014-10-09 Robert Bosch Gmbh Kraftstoff-Kolbensteckpumpe mit einem Gehäuse, mindestens einem in dem Gehäuse angeordneten axial bewegbaren Kolben, und einem Koppelabschnitt
JP6225648B2 (ja) * 2013-11-12 2017-11-08 株式会社デンソー 高圧ポンプ
DE102013224797A1 (de) 2013-12-04 2015-06-11 Robert Bosch Gmbh Kraftstoffpumpe mit einem Kolben, an dessen einem Antrieb zugewandten Endabschnitt ein Federteiler angeordnet ist
DE102014209288A1 (de) * 2014-05-16 2015-11-19 Robert Bosch Gmbh Kolbenpumpe, insbesondere Kraftstoffpumpe für ein Kraftstoffsystem für eine Brennkraftmaschine
DE102014220705B4 (de) * 2014-10-13 2016-05-04 Continental Automotive Gmbh Hochdruckpumpe für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine
JP6369337B2 (ja) * 2015-01-20 2018-08-08 株式会社デンソー 高圧ポンプ及びその製造方法
JP2016133056A (ja) * 2015-01-20 2016-07-25 株式会社デンソー 高圧ポンプ及びその製造方法
DE102015209539A1 (de) 2015-05-22 2016-11-24 Robert Bosch Gmbh Kraftstoffhochdruckpumpe
DE102016202211A1 (de) * 2016-02-12 2017-08-31 Continental Automotive Gmbh Kraftstoffhochdruckpumpe und Verfahren zur Herstellung einer Kraftstoffhochdruckpumpe
DE102016206366A1 (de) * 2016-04-15 2017-05-11 Continental Automotive Gmbh Kraftstoffhochdruckpumpe
US11002236B2 (en) 2016-11-18 2021-05-11 Hitachi Automotive Systems, Ltd. High-pressure fuel supply pump
KR101986018B1 (ko) 2017-09-20 2019-06-04 주식회사 현대케피코 고압연료펌프
KR101986017B1 (ko) 2017-09-20 2019-09-03 주식회사 현대케피코 고압연료펌프
CN110195673B (zh) * 2018-02-27 2021-05-14 纬湃汽车电子(长春)有限公司 高压泵
DE102018203319A1 (de) * 2018-03-06 2019-09-12 Robert Bosch Gmbh Kraftstoff-Hochdruckpumpe
KR102107462B1 (ko) * 2018-12-14 2020-05-07 주식회사 현대케피코 고압펌프의 패킹캐리어 변형 방지 구조
KR102098376B1 (ko) 2018-12-21 2020-05-26 주식회사 현대케피코 고압펌프용 압력해제밸브
DE102020200596A1 (de) 2019-12-23 2021-06-24 Robert Bosch Gesellschaft mit beschränkter Haftung Kraftstoff-Hochdruckpumpe
DE102020215458A1 (de) 2020-12-08 2022-06-09 Robert Bosch Gesellschaft mit beschränkter Haftung Hochdruckpumpe für ein Kraftstoffsystem einer Brennkraftmaschine
DE102021202359A1 (de) 2021-03-11 2022-09-15 Robert Bosch Gesellschaft mit beschränkter Haftung Kraftstoff-Hochdruckpumpe
DE102021208296A1 (de) * 2021-07-30 2023-02-02 Robert Bosch Gesellschaft mit beschränkter Haftung Kolbenpumpe, insbesondere Kraftstoff-Hochdruckpumpe
DE102021214498A1 (de) 2021-12-16 2023-06-22 Robert Bosch Gesellschaft mit beschränkter Haftung Hochdruckpumpe für ein Kraftstoffsystem einer Brennkraftmaschine

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
US20150017041A1 (en) * 2008-04-25 2015-01-15 Hitachi, Ltd., Mechanism for Restraining Fuel Pressure Pulsation and High Pressure Fuel Supply Pump of Internal Combustion Engine with Such Mechanism
US9709055B2 (en) * 2008-04-25 2017-07-18 Hitachi Automotive Systems, Ltd. Mechanism for restraining fuel pressure pulsation and high pressure fuel supply pump of internal combustion engine with such mechanism

Also Published As

Publication number Publication date
WO2006069818A1 (fr) 2006-07-06
CN101094988B (zh) 2010-09-29
CN101094988A (zh) 2007-12-26
DE102004063075B4 (de) 2015-11-26
ES2395942T3 (es) 2013-02-18
DE102004063075A1 (de) 2006-07-13
JP2008525713A (ja) 2008-07-17
EP1834089B1 (fr) 2012-12-12
JP4664989B2 (ja) 2011-04-06

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