WO2013098301A1 - Pompe à carburant haute pression pour un système d'injection de carburant - Google Patents

Pompe à carburant haute pression pour un système d'injection de carburant Download PDF

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Publication number
WO2013098301A1
WO2013098301A1 PCT/EP2012/076918 EP2012076918W WO2013098301A1 WO 2013098301 A1 WO2013098301 A1 WO 2013098301A1 EP 2012076918 W EP2012076918 W EP 2012076918W WO 2013098301 A1 WO2013098301 A1 WO 2013098301A1
Authority
WO
WIPO (PCT)
Prior art keywords
hollow cylinder
seal
pressure fuel
pump
pump piston
Prior art date
Application number
PCT/EP2012/076918
Other languages
German (de)
English (en)
Inventor
Markus Schetter
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
Priority to CN201280062345.9A priority Critical patent/CN104024635B/zh
Priority to EP12818522.0A priority patent/EP2798210B1/fr
Publication of WO2013098301A1 publication Critical patent/WO2013098301A1/fr
Priority to IN3227DEN2014 priority patent/IN2014DN03227A/en

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
    • 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
    • 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
    • F02M59/442—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 means preventing fuel leakage around pump plunger, e.g. fluid barriers
    • 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
    • F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
    • 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
    • F04B1/0443—Draining of the housing; Arrangements for handling leaked fluids

Definitions

  • the invention relates to a high-pressure fuel pump designed in particular as a plug-in pump for a fuel injection system for injecting fuel into the combustion chamber of an internal combustion engine having the features of the preamble of claim 1.
  • a high-pressure fuel pump designed as a plug-in pump for an internal combustion engine is disclosed, for example, in the published patent application DE 10 2008 002 195 A1. It comprises a piston which is accommodated in a hollow cylinder and has one end which projects beyond the hollow cylinder and can be displaced into a reciprocating movement by a compression spring against a radial projection of a drive shaft rotating about an axis in the hollow cylinder.
  • the hollow cylinder superior end of the piston and the hollow cylinder are liquid-tightly connected by a bellows and a from Bellows, the hollow cylinder and the pump piston enclosed annular space is connected to a leakage line, the leakage line opens directly into the annulus.
  • Bellows seals of the aforementioned type are among the contactless sealing method. They have the disadvantage that a defect leads to the immediate failure of the internal combustion engine.
  • contacting sealing methods such as rod seals and metallic seals are known, which have a leakage-resistant Form th ring gap. By tightening the exhaust gas, such leakage is no longer acceptable.
  • the present invention is therefore based on the object, a high-pressure fuel pump, in particular plug-in pump to specify, via which a permanently secure media separation is ensured.
  • the proposed high-pressure fuel pump, in particular plug-in pump, for a fuel injection system for injecting fuel into the combustion chamber of an internal combustion engine comprises a liftable pump piston whose first end is guided in a hollow cylinder and whose second end is supported indirectly via a cup-shaped component on a cam or eccentric shaft. Furthermore, the high-pressure pump comprises a preferably designed as a bellows seal, which is attached to form an annular space on the one hand on the pump piston and on the other hand on the hollow cylinder. According to the invention, a guide gap formed between the pump piston and the hollow cylinder is designed as an annular gap seal for sealing the annular space.
  • the guide gap opens into an annular groove formed in the hollow cylinder, which is connected to a leakage line for returning a leakage amount.
  • both a contactless and a contacting sealing method are used.
  • the combination of both sealing methods thus ensures a particularly secure media separation.
  • the internal combustion engine can continue to operate, since a seal is still ensured via the annular gap seal.
  • a further formed between the pump piston and the hollow cylinder and opening into the annular groove guide gap is designed as an annular gap seal.
  • the further guide gap is separated from the first guide gap via the annular groove formed in the hollow cylinder. This ensures that a leakage quantity flowing over the further guide gap into the annular groove is dissipated via the leakage line connected thereto and does not pass into the annular space enclosed by the preferably designed as a bellows seal. In this way, pressure pulsations in the annulus are avoided and consequently the annulus enclosing seal relieved.
  • the required lengths and l 2 of the two executed as annular gap seals guide column can be determined by simulation. Preferably, the length l 2 of the further guide gap is greater than the length of the first guide gap selected.
  • the seal is preferably designed as a bellows attached to an outer peripheral surface of the pump piston. In this way, the volume of the enclosed by the seal annulus is minimized. Further preferably, the attachment of the seal on the pump piston by means of a crimp ring.
  • the crimp ring allows a gas-tight connection of the seal to the pump piston. Alternatively or additionally, further fastening means may be provided.
  • the seal which is preferably designed as a bellows, is fastened to an outer peripheral surface of the hollow cylinder.
  • the fastening takes place again by means of a crimp ring, in order at the same time to effect a gas-tight connection.
  • the collar is attached radially inwardly to the hollow cylinder and extends the annular gap seal designed as a guide gap between the pump piston and the hollow cylinder.
  • the preferably designed as a bellows seal comes to lie in this way close to the pump piston, whereby the volume of the enclosed seal of the annular space on is minimized.
  • direct contact of the individual folds of the seal, which is preferably designed as a bellows, with the pump piston should be avoided in order to increase the service life of the seal.
  • the length of the preferably designed as a bellows seal is therefore to be chosen such that the opening angle of the individual folds during a stroke of the pump piston is as small as possible.
  • the seal is made of a resistant material, in particular of a plastic, such as polytetrafluoroethylene.
  • FIG. 1 shows a longitudinal section through a designed as a plug-in pump according to the invention high-pressure fuel pump
  • FIG. 2 shows a detail of FIG. 1 in the region of the guide of the pump piston
  • Fig. 3 shows a detail of Fig. 1 in the region of the attachment of the bellows seal on the hollow cylinder and
  • Fig. 4 is a perspective view of the bellows seal.
  • the plug-in pump shown in FIG. 1 comprises a pump piston 1, whose first end 1.1 is received in a hollow cylinder 2 of a cylinder head and whose second end 1.2 is supported indirectly via a cup-shaped component 3 on a camshaft 4.
  • the second end 1.2 forms a piston foot 17 on soft a spring plate 16 is placed for receiving a spring 15.
  • the spring force of the spring 15 holds the cup-shaped component 3 and the pump piston 1 in contact with the camshaft 4.
  • the spring 15 and the cup-shaped component 3 surround the hollow cylinder. 2
  • the pump piston 1 and the hollow cylinder 2 are connected to seal a guide gap 7, 10 via a seal 5 designed as a bellows.
  • the seal 5 is fastened on the one hand to an outer peripheral surface 11 of the pump piston 1 and on the other hand to an outer peripheral surface 13 of a collar 14 attached to the hollow cylinder 2.
  • the fastening takes place by means of crimp rings 12 which effect a gas-tight connection of the seal 5 to the pump piston 1 and the hollow cylinder 2.
  • the seal 5 designed as a bellows surrounds an annular space 6, in which the guide gap 7 opens.
  • the guide gap 7 terminates at an annular groove 8 formed in the hollow cylinder 2, which is connected to a leakage line 9 for the return of a leakage amount emerging via the further guide gap 10. This ensures that the leakage quantity does not get into the annular space 6 and causes pressure pulsations which would stress the seal 5.
  • the lengths and l 2 are chosen such that ⁇ l 2 .
  • the optimal lengths, which ensure a sufficient seal for media separation, can be found out by simulation.
  • the section of Fig. 3 shows the attachment of the bellows formed as a seal 5 on the collar 14 of the hollow cylinder 2 by means of a crimp ring 12.
  • At the seal 5 are for receiving the crimp rings 12 at both ends of collar portions 18 are formed (see Fig. 4), which allow application of the crimp ring 12.
  • the collar portions 18 further allow a flat application of the seal 5 on the outer peripheral surface 11 of the pump piston 1 and the outer peripheral surface 13 of the attached to the hollow cylinder 2 collar 14.
  • the position of the collar portions 18 is selected such that the convolutions of the bellows at a distance with respect to the pump piston 1 are held.
  • the volume of the annular space 6 is reduced to a minimum, in order to minimize the unwanted circulation volume at the same time.
  • the seal 5 can also be realized by a differently designed membrane seal.

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)

Abstract

L'invention concerne une pompe à carburant haute pression, en particulier une pompe enfichable, pour un système d'injection de carburant destiné à injecter du carburant dans une chambre de combustion d'un moteur à combustion interne, comprenant un piston de pompe (1) alternatif dont la première extrémité (1.1) est guidée dans un cylindre creux (2) et dont la seconde extrémité (1.2) s'appuie indirectement sur un arbre à cames ou arbre excentrique (4) par le biais d'un élément en forme de tasse (3), comprenant en outre un joint d'étanchéité (5) de préférence réalisé sous la forme d'un soufflet (5) et fixé, en configurant un espace annulaire (6), d'une part au piston de pompe (1) et d'autre part au cylindre creux (2). Selon l'invention, une fente de guidage (7) formée entre le piston de pompe (1) et le cylindre creux (2) est réalisée sous la forme d'un joint d'étanchéité de fente annulaire pour rendre étanche cet espace annulaire (6). Il est en outre prévu que la fente de guidage (7) débouche dans une rainure annulaire (8) formée dans le cylindre creux (2) et raccordée à un conduit de fuite (9) pour forcer le retour d'une quantité de fuite.
PCT/EP2012/076918 2011-12-27 2012-12-27 Pompe à carburant haute pression pour un système d'injection de carburant WO2013098301A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201280062345.9A CN104024635B (zh) 2011-12-27 2012-12-27 燃料喷射系统的高压燃料泵
EP12818522.0A EP2798210B1 (fr) 2011-12-27 2012-12-27 Pompe à carburant haute pression pour un système d'injection de carburant
IN3227DEN2014 IN2014DN03227A (fr) 2011-12-27 2014-04-22

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011089967.7 2011-12-27
DE102011089967A DE102011089967A1 (de) 2011-12-27 2011-12-27 Kraftstoffhochdruckpumpe für ein Kraftstoffeinspritzsystem

Publications (1)

Publication Number Publication Date
WO2013098301A1 true WO2013098301A1 (fr) 2013-07-04

Family

ID=47603563

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/076918 WO2013098301A1 (fr) 2011-12-27 2012-12-27 Pompe à carburant haute pression pour un système d'injection de carburant

Country Status (5)

Country Link
EP (1) EP2798210B1 (fr)
CN (1) CN104024635B (fr)
DE (1) DE102011089967A1 (fr)
IN (1) IN2014DN03227A (fr)
WO (1) WO2013098301A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015055332A1 (fr) * 2013-10-14 2015-04-23 Continental Automotive Gmbh Pompe haute pression
CN104728008A (zh) * 2013-12-23 2015-06-24 博世有限公司 燃料喷射泵

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013216983A1 (de) 2013-08-27 2015-03-05 Robert Bosch Gmbh Pumpe
DE102013224882A1 (de) 2013-12-04 2015-06-11 Robert Bosch Gmbh Pumpe zur Förderung eines Fluids
DE102014201849A1 (de) 2014-02-03 2015-08-06 Robert Bosch Gmbh Pumpe zur Förderung eines Fluids
DE102014202338A1 (de) 2014-02-10 2015-08-13 Robert Bosch Gmbh Pumpe zur Förderung eines Fluids
DE102014202340A1 (de) 2014-02-10 2015-08-13 Robert Bosch Gmbh Pumpe zur Förderung eines Fluids
DE102014202571A1 (de) 2014-02-12 2015-08-13 Robert Bosch Gmbh Pumpe zur Förderung eines Fluids
WO2016055250A1 (fr) * 2014-10-09 2016-04-14 Robert Bosch Gmbh Pompe d'alimentation de moteur à combustion interne en carburant haute-pression
GB201522211D0 (en) 2015-12-16 2016-01-27 Delphi Internat Operations Luxembourg S À R L High pressure pump with pump spring sealing sleeve
DE102016105209A1 (de) 2016-02-02 2017-08-03 Darius Loba Kraftstoffhochdruckpumpe mit einem gewichtsreduzierten Kolben
DE102018204556B3 (de) * 2018-03-26 2019-05-16 Continental Automotive Gmbh Kraftstoffhochdruckpumpe für ein Kraftstoffeinspritzsystem
CN113217320A (zh) * 2021-05-12 2021-08-06 陈志昌 一种液电智能数控曲轴轮柱塞泵

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004035188A1 (de) * 2004-07-21 2006-02-16 Bosch Rexroth Aktiengesellschaft Pumpe
DE102008002088A1 (de) * 2008-05-30 2009-12-03 Robert Bosch Gmbh Kraftstoffhochdruckpumpe
DE102008002195A1 (de) 2008-06-04 2009-12-10 Robert Bosch Gmbh Steckpumpe für eine Verbrennungskraftmaschine

Family Cites Families (3)

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Publication number Priority date Publication date Assignee Title
DE2630123A1 (de) * 1976-07-05 1978-01-12 Messer Griesheim Gmbh Einrichtung zum schutz der kolbenstangen von kolbenpumpen
US7677155B2 (en) * 2006-01-13 2010-03-16 Gm Global Technology Operations, Inc. Statically sealed high pressure fuel pump and method
DE102010030342A1 (de) * 2010-06-22 2011-12-22 Robert Bosch Gmbh Kolbenpumpe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004035188A1 (de) * 2004-07-21 2006-02-16 Bosch Rexroth Aktiengesellschaft Pumpe
DE102008002088A1 (de) * 2008-05-30 2009-12-03 Robert Bosch Gmbh Kraftstoffhochdruckpumpe
DE102008002195A1 (de) 2008-06-04 2009-12-10 Robert Bosch Gmbh Steckpumpe für eine Verbrennungskraftmaschine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015055332A1 (fr) * 2013-10-14 2015-04-23 Continental Automotive Gmbh Pompe haute pression
CN104956069A (zh) * 2013-10-14 2015-09-30 大陆汽车有限公司 高压泵
KR101881678B1 (ko) * 2013-10-14 2018-08-24 콘티넨탈 오토모티브 게엠베하 고압 펌프
US10132311B2 (en) 2013-10-14 2018-11-20 Continental Automotive Gmbh High pressure pump
CN104728008A (zh) * 2013-12-23 2015-06-24 博世有限公司 燃料喷射泵

Also Published As

Publication number Publication date
DE102011089967A1 (de) 2013-06-27
IN2014DN03227A (fr) 2015-05-22
CN104024635A (zh) 2014-09-03
EP2798210A1 (fr) 2014-11-05
CN104024635B (zh) 2016-09-07
EP2798210B1 (fr) 2017-05-24

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