WO2009144060A1 - Pompe de carburant haute pression - Google Patents

Pompe de carburant haute pression Download PDF

Info

Publication number
WO2009144060A1
WO2009144060A1 PCT/EP2009/053871 EP2009053871W WO2009144060A1 WO 2009144060 A1 WO2009144060 A1 WO 2009144060A1 EP 2009053871 W EP2009053871 W EP 2009053871W WO 2009144060 A1 WO2009144060 A1 WO 2009144060A1
Authority
WO
WIPO (PCT)
Prior art keywords
bellows
plug
cylinder head
cup
pump according
Prior art date
Application number
PCT/EP2009/053871
Other languages
German (de)
English (en)
Inventor
Friedrich Boecking
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 WO2009144060A1 publication Critical patent/WO2009144060A1/fr

Links

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
    • 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
    • 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

Definitions

  • the invention relates to a pump, in particular of a high-pressure fuel pump according to the preamble of claim 1.
  • Such a high-pressure fuel pump is known from DE19515191A1. It is driven by an eccentric of a rotating about an axis of the drive shaft to be supplied with the fuel internal combustion engine, for example, the eccentric camshaft or a balancer shaft. Such waves are arranged in a space acted upon by lubricating oil of the internal combustion engine to ensure adequate lubrication of their storage. Fuel has extremely poor lubricating properties, with the related behavior by the usual additives even further can worsen. There is therefore an urgent need to prevent the passage of fuel from the high-pressure fuel pump in the region of the drive shaft. Conversely, no lubricating oil may enter the space filled with fuel, because the ignition behavior and combustion behavior of the fuel is changed very adversely. Especially at standstill an internal combustion engine, this danger is always given by the high creep of the lubricating oils.
  • the high-pressure fuel pump according to the invention with the features according to claim 1 has the advantage that the filled with the fuel spaces of the high-pressure fuel pump and acted upon by the lubricating oil space of the internal combustion engine are completely separated from each other by a liquid impermeable bellows. A mutual mixing of fuel and lubricating oil is therefore completely excluded and always ensures perfect lubrication of the internal combustion engine as well as an excellent combustion process.
  • the plug-in pump has no outer parts that can be changed during the storage and transport functionally impairing. Even a faulty installation is completely excluded.
  • the embodiment according to claim 6 has the advantage that the bellows can be mechanically protected by the pressure spring which surrounds it on the outside completely and thus can be produced in a particularly thin-walled manner.
  • the deformation-opposing elastic forces decrease accordingly, which reduces the fuel consumption.
  • the embodiment according to claim 7 has the advantage that reduces the length and thus at the same time the manufacturing cost of the bellows.
  • the embodiment according to claim 8 has the advantage that that the operational deformations of the bellows on an extremely large length to distribute.
  • the specific deformations are accordingly extremely low, which reduces the deformation resistance and improves the longevity.
  • Figure 1 is a mounted in a bore of an internal combustion engine plug-in pump in longitudinal section, in which the bellows is disposed radially within the compression spring and has a substantially coincident with the axial length of the compression spring length.
  • FIG. 2 shows a plug-in pump inserted into a bore of an internal combustion engine in longitudinal section, in which the bellows surrounds the pressure spring over its entire length radially on the outside.
  • a plug-in pump inserted into a bore of an internal combustion engine in longitudinal section, in which the bellows is arranged radially outside the compression spring in the axial space between the cup and the cylinder head.
  • the plug-in pump shown in Fig. 1 is intended for feeding of up to 2000 bar combinbeetztem fuel into the combustion chamber of an internal combustion engine 1. It comprises an insertable into a bore of the internal combustion engine 1 cylinder head 2 with a in the direction of a drive shaft 3 of Internal combustion engine 1 open hollow cylinder 4.
  • the drive shaft 3 is provided with an eccentric 5.
  • a piston 6 is received, which projects beyond the hollow cylinder 4, which is fixed to a longitudinally displaceable on the hollow cylinder 4 Cup 7 and pressed by a compression spring 8 yielding to the eccentric 5.
  • the drive shaft rotates, this results in a reciprocating movement of the piston 6 in the hollow cylinder 4, in which the connected to the piston 6 and guided on the hollow cylinder 4 Cup 7 is included.
  • the cup 7 and the cylinder head 2 are liquid-tightly connected by a bellows 9, which engages over the compression spring 8 over its entire length.
  • the bellows is arranged radially on the outside of the compression spring 8. Leakage fuel that passes through the sealing gap between the piston 6 and the hollow cylinder 4 can not thereby reach the interior of the internal combustion engine 1 charged with lubricating oil and lubricating oil from the interior of the internal combustion engine 1 does not enter the fuel pump chamber 11 of the plug-in pump.
  • the pump chamber 11 is connected by a suction valve to a fuel supply and by a high pressure valve with a pressure accumulator for fuel, which is under high pressure.
  • the direction of flow of the fuel through the plug-in pump is indicated by arrows.
  • the space defined by the bellows 7, the hollow cylinder 4, the piston 6 and the cup 7, in which the compression spring 8 is arranged at the same time, is connected by a discharge opening 10 with a leakage space, not shown.
  • Leakage fluid which may be fuel and / or lubricating oil, is thereby drained away and the space kept pressure free.
  • the space radially inside the cup 7 is connected by an overflow opening with the space containing the compression spring 8.
  • the cup 7 and the piston 6 are immovably fixed to each other.
  • the cup 7 in this case comprises a piston head, in which a parallel to the longitudinal direction of the drive shaft 3 extending and in opposite directions to the drive shaft 3 and the eccentric 5 rotatable support roller 12 is inserted. The transmission of shear forces on the cup 7 and piston 6 is thereby suppressed during operation.
  • the bellows 9 may consist of polymeric material and then ends, deviating from the drawing, in the longitudinal direction at least one end in an integrally formed O-ring seal, which opens into a radially outwardly open groove of a cross section adapted to the profile of the cylinder head 2 and / or the cup 7 is inserted sealingly.
  • the production and assembly are then particularly simple.
  • the cylinder head under cross-end of the bellows 9 also end in a flat sealing washer, which is pressed during assembly of the plug-in pump between the cylinder head and the housing of the internal combustion engine 1 and thereby not only causes a seal in the sense of the invention but in addition to an additional sealing of the cylinder head relative to the internal combustion engine.
  • the bellows 9 is made of metal and is liquid-tightly connected to the cylinder head 2 and / or the cup 7 in the longitudinal direction at least one end by welding or gluing with a flat surface. If a mutual connection by welding is used, it is particularly recommended to make the connection by laser welding.
  • the bellows 9 surrounds the compression spring 8 radially on the outside.
  • the compression spring 8 is thereby additionally protected against a change in position, which may arise during storage, assembly or transport.
  • the plug-in pump shown in Fig. 2 corresponds in functional terms to those described above. Deviating from Fig. 1, however, the bellows 9 is arranged in a first, radial intermediate space between the compression spring 8 and the cup 7 and thus of reduced cross-section. It is further protected by the compression spring 8 from external damage, which allows it to reduce its wall thickness with the aim to reduce the forces necessary for a deformation forces and thus at the same time required for the operation of the plug-in drive forces.
  • Fig. 3 shows a construction in which the bellows 9 between the cylinder head 2 facing the end of the cup 7 and the cylinder head 2 is arranged. Due to the reduced size results in a reduction in the manufacturing costs. Also, the compression spring 8 is inaccessible from the outside taken in the bellows 9 and protected in a special way from damage and undesirable changes in position.

Landscapes

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

Abstract

Pompe enfichable destinée à alimenter une chambre de combustion d'un moteur à combustion interne (1) en carburant sous haute pression, et comportant une culasse (2) qui peut être intégrée dans un orifice du moteur à combustion interne (1) et qui comprend un cylindre creux (4) ouvert en direction d'un arbre d'entraînement (3) doté d'un excentrique (5). Dans le cylindre creux (4) est logé un piston (6), en saillie par rapport au cylindre, ce piston étant fixé à une coupelle (7) mobile et venant se plaquer contre l'excentrique (5) de manière élastique au moyen d'un ressort de pression (8). La coupelle (7) et la culasse (2) sont reliées par un soufflet (9) de manière étanche aux liquides.
PCT/EP2009/053871 2008-05-30 2009-04-01 Pompe de carburant haute pression WO2009144060A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810002088 DE102008002088A1 (de) 2008-05-30 2008-05-30 Kraftstoffhochdruckpumpe
DE102008002088.5 2008-05-30

Publications (1)

Publication Number Publication Date
WO2009144060A1 true WO2009144060A1 (fr) 2009-12-03

Family

ID=40908490

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/053871 WO2009144060A1 (fr) 2008-05-30 2009-04-01 Pompe de carburant haute pression

Country Status (2)

Country Link
DE (1) DE102008002088A1 (fr)
WO (1) WO2009144060A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013139498A1 (fr) * 2012-03-19 2013-09-26 Robert Bosch Gmbh Pompe à haute pression
KR20180096684A (ko) * 2015-12-16 2018-08-29 델피 테크놀로지스 아이피 리미티드 펌프 스프링 밀봉 슬리브를 갖는 고압 펌프
EP4361472A1 (fr) * 2022-10-24 2024-05-01 ALSTOM Holdings Dispositif d'étanchéité, ensemble et véhicule comprenant un tel dispositif d'étanchéité et procédé d'assemblage d'un véhicule comprenant un tel dispositif d'étanchéité

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011089967A1 (de) * 2011-12-27 2013-06-27 Robert Bosch Gmbh Kraftstoffhochdruckpumpe für ein Kraftstoffeinspritzsystem
KR101881678B1 (ko) * 2013-10-14 2018-08-24 콘티넨탈 오토모티브 게엠베하 고압 펌프
DE102014206966A1 (de) 2014-04-10 2015-10-15 Robert Bosch Gmbh Kraftstoffhochdruckpumpe für ein Kraftstoffeinspritzsystem
DE102014206965A1 (de) 2014-04-10 2015-10-15 Robert Bosch Gmbh Kraftstoffhochdruckpumpe für ein Kraftstoffeinspritzsystem
DE102014206962A1 (de) 2014-04-10 2015-10-15 Robert Bosch Gmbh Kraftstoffhochdruckpumpe für ein Kraftstoffeinspritzsystem

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19515191A1 (de) * 1994-04-28 1995-11-02 Nippon Denso Co Hochdruck-Kraftstoffpumpe
EP0879960A2 (fr) * 1997-05-19 1998-11-25 Honda Giken Kogyo Kabushiki Kaisha Pompe à haute pression pour combustible
US6053208A (en) * 1998-12-28 2000-04-25 Mitsubishi Denki Kabushiki Kaisha Surge absorber assembly
EP1876353A1 (fr) * 2006-07-07 2008-01-09 Siemens Automotive Hydraulics Sa Pompe transfert à plusieurs pistons

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19515191A1 (de) * 1994-04-28 1995-11-02 Nippon Denso Co Hochdruck-Kraftstoffpumpe
EP0879960A2 (fr) * 1997-05-19 1998-11-25 Honda Giken Kogyo Kabushiki Kaisha Pompe à haute pression pour combustible
US6053208A (en) * 1998-12-28 2000-04-25 Mitsubishi Denki Kabushiki Kaisha Surge absorber assembly
EP1876353A1 (fr) * 2006-07-07 2008-01-09 Siemens Automotive Hydraulics Sa Pompe transfert à plusieurs pistons

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013139498A1 (fr) * 2012-03-19 2013-09-26 Robert Bosch Gmbh Pompe à haute pression
KR20180096684A (ko) * 2015-12-16 2018-08-29 델피 테크놀로지스 아이피 리미티드 펌프 스프링 밀봉 슬리브를 갖는 고압 펌프
KR102634019B1 (ko) 2015-12-16 2024-02-06 델피 테크놀로지스 아이피 리미티드 펌프 스프링 밀봉 슬리브를 갖는 고압 펌프
EP4361472A1 (fr) * 2022-10-24 2024-05-01 ALSTOM Holdings Dispositif d'étanchéité, ensemble et véhicule comprenant un tel dispositif d'étanchéité et procédé d'assemblage d'un véhicule comprenant un tel dispositif d'étanchéité

Also Published As

Publication number Publication date
DE102008002088A1 (de) 2009-12-03

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