EP2379871A1 - Pompe à haute pression - Google Patents

Pompe à haute pression

Info

Publication number
EP2379871A1
EP2379871A1 EP09760836A EP09760836A EP2379871A1 EP 2379871 A1 EP2379871 A1 EP 2379871A1 EP 09760836 A EP09760836 A EP 09760836A EP 09760836 A EP09760836 A EP 09760836A EP 2379871 A1 EP2379871 A1 EP 2379871A1
Authority
EP
European Patent Office
Prior art keywords
fluid
pressure pump
hollow cylindrical
cylinder housing
pressure
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
EP09760836A
Other languages
German (de)
English (en)
Other versions
EP2379871B1 (fr
Inventor
Uwe Nigrin
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.)
Continental Automotive GmbH
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP2379871A1 publication Critical patent/EP2379871A1/fr
Application granted granted Critical
Publication of EP2379871B1 publication Critical patent/EP2379871B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/205—Quantity of fuel admitted to pumping elements being metered by an auxiliary metering device
    • 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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment

Definitions

  • the invention relates to a high-pressure pump.
  • such a high-pressure pump is used as a feed pump for conveying fluid for a storage injection system for internal combustion engines of motor vehicles.
  • Storage injection systems for internal combustion engines of motor vehicles should be able to provide the necessary volume flow and the required fluid pressure.
  • the high-pressure pump is subject to strong loads in memory injection systems for motor vehicles, in particular mechanical stresses. In particular, large forces must be absorbed by such high-pressure pumps. Thus, both high demands are placed on the materials that make up the components of the high pressure pump, as well as the construction of the high pressure pump.
  • the object of the invention is to provide a high-pressure pump, which allows reliable and precise operation even at high pump pressures and thereby subject to the lowest possible wear. At the same time, the high-pressure pump should be inexpensive to produce.
  • the object is solved by the features of the independent claims. Advantageous embodiments of the invention are characterized in the subclaims.
  • the invention is characterized by a high-pressure pump for conveying a fluid, having a rotatable drive shaft, a driven by the drive shaft pump unit having a cylinder housing with a fluid inlet chamber and a hydraulically coupled to the fluid inlet chamber high-pressure chamber in which an axially movable, with of the
  • Drive shaft is operatively connected to the high-pressure piston and which can be acted upon by high pressure, and a volume flow control valve, which is designed to adjust the fluid flow into the high-pressure pump, wherein the volume flow control valve is at least partially disposed in the fluid inlet chamber.
  • fluid is to be understood here in its broader sense, so the fluid can be both a liquid and a gas.
  • Such a high-pressure pump has the advantage that a direct hydraulic connection between the volume flow control valve and the fluid inlet chamber of the high-pressure pump is possible. Thus, no connection line between the flow control valve and the fluid inlet chamber of the high-pressure pump is required. In particular, a compact design of the high-pressure pump with integrated volume flow control valve can be realized.
  • the fluid inlet chamber is arranged in a substantially hollow cylindrical portion of the cylinder housing, and the hollow cylindrical portion has an outer wall.
  • the high-pressure pump has a connection piece with an inner fluid channel for supplying fluid.
  • the connecting piece has a hollow cylindrical base body with an inner wall which rests in a fluid-tight manner on the outer wall of the hollow cylindrical section, and in the hollow cylindrical portion of the cylinder housing a fluid passage opening is formed, by means of which the fluid channel is hydraulically coupled to the fluid inlet chamber.
  • an annular groove is formed in the hollow cylindrical base body in the region of the inner wall, and the connecting piece is arranged on the hollow cylindrical portion of the cylinder housing, that the fluid passage opening is hydraulically coupled to the annular groove.
  • the connecting piece is mechanically coupled by means of a snap connection with the hollow cylindrical section of the cylinder housing. This has the advantage that a simple, rapid and secure coupling between the connecting piece and the hollow cylindrical portion of the cylinder housing is possible.
  • the connecting piece is formed from a material which comprises a plastic. For a simple and inexpensive design of the connection piece is possible.
  • an inlet valve is disposed in the cylinder housing upstream of the high pressure chamber and downstream of the volumetric flow control valve, and the inlet valve is partially disposed within the volumetric flow control valve.
  • FIG. 1 shows a schematic view of a high-pressure pump in a longitudinal section
  • FIG. 2 shows a schematic view of the high-pressure pump in a cross section along the line II-II 'of FIG. 1.
  • FIGS 1 and 2 show a high-pressure pump 10 with a pump unit 12.
  • the high-pressure pump 10 can be used in particular for high-pressure fuel supply in a storage injection system of an internal combustion engine of a motor vehicle.
  • the high pressure pump 10 has centrally a drive shaft 16 which is in operative connection with a cam ring with cam 18 and is rotatable about a rotation axis D.
  • the number of conveying and compression strokes over the number of cams 18 can be specified.
  • the number of conveying or compression strokes corresponds to the number of cams.
  • an eccentric ring and sliding shoes can also be used in conjunction with the drive shaft 16.
  • a circular ring and a mushroom piston in conjunction with the drive shaft 16 can be used.
  • the high pressure pump 10 may also be designed as a crank drive pump.
  • the pump unit 12 essentially consists of a cylinder housing 14 with a longitudinal axis L, a high pressure piston 20, a high pressure chamber 21 arranged in the cylinder housing 14, a spring 26 and a plunger assembly 28.
  • the cylinder housing 14, the high pressure piston 20, the high pressure chamber 21 and the spring 26 are arranged coaxially with each other.
  • the cylinder housing 14 is formed of a metal, preferably a steel.
  • the high pressure piston 20 is axially movably mounted in the high pressure chamber 21 and is in operative connection with the drive shaft 16 and the cam 18.
  • the high-pressure piston 20 is held in constant contact with the cams 18 by means of the spring 26, which is preferably designed as a helical compression spring and is preferably supported on the cylinder housing 14 and on the high-pressure piston 20.
  • the spring 26 which is preferably designed as a helical compression spring and is preferably supported on the cylinder housing 14 and on the high-pressure piston 20.
  • the cylinder housing 14 has a high-pressure chamber inlet line 22, in which preferably an inlet valve 23 is arranged.
  • the inlet valve 23 facilitates the filling of the high pressure chamber 21 and prevents the backflow of the fluid from the high pressure chamber inlet line 22 during filling.
  • the cylinder housing 14 further has a high pressure chamber drain line 24 and an outlet valve 25 arranged therein. Via the high-pressure chamber drain line 24, the outlet valve 25 and a high-pressure nozzle 29, the fluid can be ejected from the high-pressure chamber 21 in a flow direction F of the fluid in the direction of a fluid reservoir, not shown.
  • a suction stroke that is to say a downward movement of the high-pressure piston 20 with respect to FIG. 1
  • fluid, in particular fuel is conveyed from the high-pressure chamber feed line 22 via the inlet valve 23 into the high-pressure chamber 21, the outlet valve 25 being closed.
  • a pumping stroke that is to say a movement of the high-pressure piston 20 directed upward with respect to FIG. 1, the fuel in the high-pressure chamber 21 is compressed or discharged via the outlet valve 25 under high pressure, the inlet valve 23 being closed.
  • a fluid inlet chamber 30 is arranged, which is hydraulically coupled to the high-pressure chamber 21 via the inlet valve 23.
  • the fluid inlet chamber 30 is arranged in the cylinder housing 14 such that a hollow cylindrical portion 32 of the cylinder housing 14 is formed.
  • the hollow cylindrical portion 32 has an outer wall 34.
  • one or more fluid passage openings 36 are formed, which, based on the longitudinal axis L of the cylinder housing 14, extending in the radial direction.
  • a volume flow control valve 40 is arranged in the fluid inlet chamber 30, in the fluid inlet chamber 30, a volume flow control valve 40 is arranged.
  • the volume flow control valve 40 is only partially disposed in the fluid inlet chamber 30.
  • the volume flow control valve 40 may also be arranged completely in the fluid inlet chamber 30.
  • the volume flow control valve 40 serves to adjust the fluid flow in the high-pressure pump 10.
  • the volume flow control valve 40 has a valve inlet line 42 and a valve outlet line 44.
  • a valve stem 46 is formed. Depending on the axial position of the valve stem 46, a fluid flow of the
  • Valve inlet line 42 to the valve drain line 44 allows his or this be prevented.
  • the volume flow control valve 40 is fixedly arranged in the hollow cylindrical section 32 of the cylinder housing 14 by means of a screw 48.
  • the volume flow control valve 40 may also have a latching connection in order to fix the volume flow control valve 40 firmly in the hollow cylindrical section 32 of the cylinder housing 14.
  • connecting elements for fastening the volume flow control valve 40 in the hollow cylindrical portion 32 of the cylinder housing 14 can be used.
  • sealing elements 50 By means of one or more sealing elements 50, leakage of fluid from the volume flow control valve 40 to the outside or inadvertent penetration of fluid into the valve drain line 44 can be prevented.
  • no connection line between the volume flow control valve 40 and the fluid inlet chamber 30 of the high-pressure pump 10 is required. It can thus be achieved in particular a particularly compact construction of the high-pressure pump 10 with the integrated volume flow control valve 40.
  • the inlet valve 23 is partially disposed within the volume flow control valve 40. This makes it possible to achieve a very compact design of the high-pressure pump 10 with an integration of the volume flow control valve 40 and the inlet valve 23 in a construction space of the cylinder housing 14.
  • the inlet valve 23 may also be arranged completely outside the volume flow control valve 40.
  • the high-pressure pump 10 further has a connecting piece 52, with a hollow cylindrical base body 54 and a pipe section 56.
  • the connecting piece 52 is preferably formed from a material which comprises a plastic. Particularly preferably, a connecting piece 52 is completely formed from a plastic.
  • the hollow cylindrical base body 54 has a continuous fluid channel 58 in the direction of the longitudinal axis L of the cylinder housing 14.
  • the fluid channel 58 of the connecting piece 52 serves to supply fluid to the fluid inlet chamber 30 and thus on to the high-pressure chamber 21 of the high-pressure pump 10.
  • the hollow cylindrical basic body 54 has an inner wall 62, which rests in a fluid-tight manner on the outer wall 34 of the hollow cylindrical portion 32 of the cylinder housing 14. By means of the fluid passage opening 36, the fluid channel 58 is hydraulically coupled to the fluid inlet chamber 30. It can thus be achieved that the connecting piece 52 is designed as the only common fluid connection for the high-pressure chamber 21 of the high-pressure pump 10 and the volume flow control valve 40.
  • annular groove 60 is formed, through which a fluid flow from the fluid channel 58 to the valve inlet line 42 of the volume flow control valve 40 regardless of the position of the connecting piece 52 with respect to an azimuth angle ALPHA between the connecting piece 52 and a predetermined reference line (in the embodiment shown here by way of example with respect to a central axis M of the high-pressure nozzle 29) is made possible ( Figure 2).
  • the connecting piece 52 is coupled by means of a snap connection 64 in the direction of the longitudinal axis L of the cylinder housing 14 with the hollow cylindrical portion 32 of the cylinder housing 14.
  • the snap connection 64 allows a secure coupling between the connecting piece 52 and the hollow cylindrical portion 32 of the cylinder housing 14th
  • the high-pressure piston 20 should be in a position in the pump unit 12, in which it has a maximum distance from the drive shaft 16, as shown in Figure 1.
  • the high pressure chamber 21 is increased and the fluid is via the fluid channel 58 and the annular groove 60 of the connecting piece 52, the fluid passage opening 36 of the cylinder housing 14, the valve inlet line 42 and the valve drain line 44 of the volume flow control valve 40, and the fluid inlet chamber 30 is guided via the inlet valve 23 designed as a check valve into the high-pressure chamber 21.
  • the high-pressure chamber 21 is filled with fluid.
  • the high-pressure piston 20 is moved away from the drive shaft 16 by the cams 18 in the direction of the longitudinal axis L, thereby compressing the fluid located in the high-pressure chamber 21.
  • pressures of up to 2000 bar in the high pressure chamber 21 may occur.
  • the compressed fluid may be following the Compression stroke via the Hochdruckschablauftechnisch 24 and the now open exhaust valve 25 are ejected.
  • the high-pressure pump 10 is, for example, a high-pressure fuel pump of an injection system of an internal combustion engine, the fuel subjected to high pressure can reach a fluid accumulator designed as a high-pressure fuel accumulator, the so-called common rail.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

L'invention concerne une pompe à haute pression (10) pour le déplacement d'un fluide, avec un arbre d'entraînement rotatif (16), avec une unité de pompe (12) qui peut être entraînée par l'arbre d'entraînement (16) et qui possède un carter cylindrique (14) avec une chambre d'admission du fluide (30) et une chambre à haute pression (21) pouvant être couplée hydrauliquement avec la chambre d'admission du fluide (30), dans lequel est disposé un piston à haute pression (20) pouvant se déplacer axialement et être mis en liaison fonctionnelle avec l'arbre d'entraînement (16) et pouvant être soumis à une haute pression, et avec une vanne de commande de débit volumique (40). La vanne de commande de débit volumique (40) est configurée pour régler le flux de fluide entrant dans la pompe à haute pression (10) et est au moins partiellement implanté dans la chambre d'admission du fluide (30).
EP09760836.8A 2008-12-16 2009-11-23 Pompe à haute pression Active EP2379871B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008062518.3A DE102008062518B4 (de) 2008-12-16 2008-12-16 Hochdruckpumpe
PCT/EP2009/065661 WO2010072493A1 (fr) 2008-12-16 2009-11-23 Pompe à haute pression

Publications (2)

Publication Number Publication Date
EP2379871A1 true EP2379871A1 (fr) 2011-10-26
EP2379871B1 EP2379871B1 (fr) 2017-02-08

Family

ID=41651443

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09760836.8A Active EP2379871B1 (fr) 2008-12-16 2009-11-23 Pompe à haute pression

Country Status (3)

Country Link
EP (1) EP2379871B1 (fr)
DE (1) DE102008062518B4 (fr)
WO (1) WO2010072493A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011003104A1 (de) * 2011-01-25 2012-07-26 Continental Automotive Gmbh Hochdruckpumpe
DE102012224430A1 (de) * 2012-12-27 2014-07-03 Robert Bosch Gmbh Hochdruckpumpe für ein Kraftstoffeinspritzsystem
DE102021102709A1 (de) 2021-02-05 2022-08-11 Joachim Risse Hochdruckpumpe

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5058553A (en) * 1988-11-24 1991-10-22 Nippondenso Co., Ltd. Variable-discharge high pressure pump
DE10124238A1 (de) * 2001-05-18 2002-11-28 Bosch Gmbh Robert Hochdruck-Kraftstoffpumpe, insbesondere für direkteinspritzende Brennkraftmaschinen, sowie Kraftstoffsystem und Brennkraftmaschine
JP3944413B2 (ja) * 2002-05-24 2007-07-11 株式会社日立製作所 高圧燃料供給ポンプ
DE10327411B4 (de) * 2002-10-15 2015-12-17 Robert Bosch Gmbh Druckbegrenzungsventil sowie Kraftstoffsystem mit einem solchen Druckbegrenzungsventil
JP4415929B2 (ja) * 2005-11-16 2010-02-17 株式会社日立製作所 高圧燃料供給ポンプ
JP2007162677A (ja) * 2005-11-21 2007-06-28 Denso Corp 高圧燃料ポンプ
JP2008057451A (ja) * 2006-08-31 2008-03-13 Hitachi Ltd 高圧燃料供給ポンプ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010072493A1 *

Also Published As

Publication number Publication date
EP2379871B1 (fr) 2017-02-08
DE102008062518B4 (de) 2016-05-25
DE102008062518A1 (de) 2010-06-24
WO2010072493A1 (fr) 2010-07-01

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