EP2304220B1 - Pompe a haute pression - Google Patents

Pompe a haute pression Download PDF

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Publication number
EP2304220B1
EP2304220B1 EP09757358A EP09757358A EP2304220B1 EP 2304220 B1 EP2304220 B1 EP 2304220B1 EP 09757358 A EP09757358 A EP 09757358A EP 09757358 A EP09757358 A EP 09757358A EP 2304220 B1 EP2304220 B1 EP 2304220B1
Authority
EP
European Patent Office
Prior art keywords
pump
guide sleeve
guide piece
pump head
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.)
Not-in-force
Application number
EP09757358A
Other languages
German (de)
English (en)
Other versions
EP2304220A1 (fr
Inventor
Hans-Christoph Magel
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 EP2304220A1 publication Critical patent/EP2304220A1/fr
Application granted granted Critical
Publication of EP2304220B1 publication Critical patent/EP2304220B1/fr
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
    • F02M59/442—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

Definitions

  • the invention relates to a high-pressure pump for a fuel injection device of an internal combustion engine according to the preamble of claim 1.
  • Such a high-pressure pump is through the US-A-5,899,136 known.
  • This high-pressure pump has an axially guided in a guide piece pump piston and a pump head.
  • the guide piece, the pump piston and the pump head define a working space which is in connection with an inlet and an outlet for the fuel to be delivered.
  • the pump piston is additionally guided in a guide sleeve, which is arranged in the working space such that the operating pressure prevailing during operation of the pump in the working space on the outer peripheral surface and on the pump head end face of the guide sleeve abliegt-
  • the guide sleeve must by means of additional measures in the axial Direction be braced and possibly occurring between the pump piston and the guide sleeve leakage can get into other parts of the high-pressure pump.
  • the high-pressure pump according to the invention with the features of claim 1 has the advantage that the guide sleeve is supported in a simple manner in the axial direction and possibly occurring between the pump piston and the guide sleeve leakage can be reliably collected and removed.
  • a biting edge arranged on the outside of the guide sleeve can contribute. If this is done, namely, the end face tapered or receives a cutout, resulting in cooperating with a flat contact surface on the guide piece a cavity that can be used as a leakage space.
  • a leakage space can also be produced by a corresponding frontal recess in the guide sleeve and / or in the guide piece.
  • the leakage chamber intercepts any fuel escaping via the sealing gap between pump piston and guide sleeve. In this case, there is a lesser pressure at the leakage area limiting Stirnff kaue the guide sleeve than at the Working space delimiting surfaces. It is thus ensured that the guide sleeve is held in sealing engagement with the guide piece.
  • the pump head facing end face of the guide sleeve is additionally acted upon by the spring force of a spring.
  • the spring may be, for example, a screw or plate spring arranged between the end face of the guide sleeve and the pump head. The additional spring force ensures the required contact pressure of the guide sleeve on the guide piece during operation of the pump.
  • the face facing away from the pump head or the guide piece facing end face of the guide sleeve may be provided with a biting edge, which forms a circular or annular, applied to the guide piece sealing edge.
  • the surface pressure is preferably chosen so high that it leads to a slight deformation of at least one contact surface, whereby an even greater tightness is ensured.
  • the pump head preferably has a cylindrical projection projecting into the working space, on the outer peripheral surface of which the working pressure prevailing in the working space prevails during operation of the pump.
  • the inlet and / or outlet for the fuel to be delivered is also arranged in the cylindrical projection of the pump head.
  • the size of the end face of the cylindrical projection of the pump head determines the effective area and thus the pressure force with which this surface is acted upon operation of the pump in the delivery stroke. The size of the end face can therefore influence the stress ratio in the material, so that it has a positive effect on the strength of this area.
  • the inlet and the outlet bore in the pump head in particular with formation of a cylindrical approach, there may be arranged only the outlet in the pump head or the cylindrical extension of the pump head and the fuel to be delivered to the working space via a hole in the guide piece and be supplied via the leakage space.
  • the bore in the guide piece is arranged such that it opens into the leakage space, which is formed between the guide sleeve and guide piece. It thus replaces an inlet bore formed in the pump head, so that by dispensing with such a bore, the strength of the pump head can be further increased.
  • the hydraulic pressure in the leakage chamber increases until the guide sleeve is lifted out of its position on the guide piece, originally sealing seat.
  • the fuel can now reach the working space via the leakage chamber.
  • the guide sleeve is thus formed as it were as a filling valve.
  • the pressure of the pump in the working space falls below the pressure in the leakage chamber and the valve opens.
  • the guide sleeve formed as a valve is additionally held by spring force in its valve seat, the spring force is to be dimensioned such that an opening of the valve is ensured in the suction phase.
  • the opening pressure can be adjusted via the sealing seat of the guide sleeve and the spring force.
  • the fuel to be delivered to the working space can be supplied via flow channels formed in the guide region of the guide piece and via the leakage space.
  • the flow channels open into the leakage space, from where the fuel with increasing pressure, which causes a lifting of the guide sleeve, enters the working space.
  • the mode of action thus corresponds to that mentioned above in connection with an inlet bore arranged in the guide piece.
  • the guide sleeve forms at the same time a filling valve, which closes the leakage chamber in the delivery stroke with respect to the working space sealing and allows the suction line of the fuel through the leakage chamber.
  • a metering unit may be provided to allow control of the delivery rate of the pump.
  • the guide piece 1, the pump piston 2 and the pump head 3 define a working space 4, in which a separate, the pump piston 2 tightly enclosing guide sleeve 7 is inserted.
  • the the Guide piece 1 facing end face of the guide sleeve 7 rests against the bottom of the guide piece 1.
  • An arranged between the guide sleeve 7 and the pump head 3 spring 8 causes an additional contact pressure.
  • Fig. 1 it is a plate spring 8
  • a coil spring finds its use.
  • the drive of the high-pressure pump takes place in both embodiments via an eccentric 14 rotating about a shaft, on which runs a roller 15 connected to the pump piston 2. To reset the pump piston 2, this is also spring-loaded.
  • the guide sleeve 7 leads in both embodiments that an expansion of the sealing gap between the pump piston 2 and guide sleeve 7 is counteracted by the fact that on the outer peripheral side of the guide sleeve 7 also prevails during operation of the pump in the working space prevailing working pressure and thus the voltage applied to the inner peripheral surface Working pressure at least partially compensated. Should fuel still escape via the sealing gap between pump piston 2 and guide sleeve 7, this is collected in a formed between the guide sleeve 7 and guide piece 1 leakage chamber 10.
  • the guide piece 1 facing end face of the guide sleeve 7 is formed conical, so that the outer peripheral side of the end face an annular biting edge 9 is formed as a sealing edge. This closes the leakage chamber 10 against the working space 4 sealingly.
  • the formation of a biting edge 9 is not absolutely necessary, but increases the contact pressure in the contact area and thus the tightness of this area.
  • the guide sleeve 7 consists essentially of a simple tubular body which is easy and thus inexpensive to produce.
  • the simple geometric shape also allows the use of high-strength materials that are difficult to work and therefore often find no use in the formation of complicated designs.
  • FIG. 1 illustrated example of a high-pressure pump according to the invention has an inlet and an outlet 5, 6 for the fuel to be delivered in the pump head 3.
  • this has a cylindrical projection 11 which projects into the working space 4 and abuts on the outer peripheral surface of the prevailing during operation of the pump in the working space working pressure.
  • the spring 8 is supported against the end face of the cylindrical projection 11.
  • Fig. 1 In contrast to the example of Fig. 1 has the pump head 3 of the embodiment of the Fig. 2 only a finish 6 on. As a result, the latter already has a higher strength.
  • the end face of the cylindrical shoulder 11 of the pump head 3 is loaded by means of the spring 8, but a region lying opposite the cylindrical projection 11.
  • the inlet bore instead of the inlet bore, several axially extending and opening into the leakage chamber 10 flow channels in the guide portion 13 of the guide piece 1 are provided.
  • piston pump Any piston pump may be made according to the invention described above.
  • the advantages of the invention are therefore in all types of piston pump, such as the single or multi-piston pump, the series pump, the V-pump, the axial piston pump, usable.
  • the structure of the pump is essentially composed of basically known components produced by conventional manufacturing processes. The costs can thus be kept low.

Landscapes

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

Abstract

L'invention concerne une pompe à haute pression pour un dispositif d'injection de carburant d'une machine à combustion interne, avec un piston de pompe (2) guidé axialement par une pièce de guidage (1) et une tête de pompe (3). La pièce de guidage, le piston de pompe et la tête de pompe délimitent un espace de travail (4) qui est en liaison avec une arrivée (5) et/ou une évacuation (6) du carburant à déplacer. Selon l'invention, le piston de pompe (2) est en outre guidé dans une douille de guidage (7) qui est montée dans l'espace de travail (4) afin que, lorsque la pompe est en service, la pression de travail régnant dans l'espace de travail soit appliquée sur les surfaces périphériques extérieures de la douille de guidage (7) et sur sa face frontale tournée vers la tête de pompe (3).

Claims (8)

  1. Pompe à haute pression pour un dispositif d'injection de carburant d'un moteur à combustion interne comprenant un piston de pompe (2) guidé axialement dans une pièce de guidage (1) et une tête de pompe (3), la pièce de guidage (1), le piston de pompe (2) et la tête de pompe (3) délimitant un espace de travail (4) qui est en liaison avec une entrée (5) et/ou une sortie (6) pour le carburant à refouler, le piston de pompe (2) étant en outre guidé dans une douille de guidage (7) qui est disposée dans l'espace de travail (4) de telle sorte que la pression de travail régnant dans l'espace de travail (4) lors du fonctionnement de la pompe s'applique à la surface périphérique extérieure et à la surface frontale tournée vers la tête de pompe (3) de la douille de guidage (7), caractérisée en ce que la douille de guidage (7) s'applique avec une surface frontale contre un fond de la pièce de guidage (1) et en ce qu'entre la surface frontale tournée vers la pièce de guidage (1) de la douille de guidage (7) et la pièce de guidage (1) est réalisé un espace de fuite (10).
  2. Pompe à haute pression selon la revendication 1, caractérisée en ce que la surface frontale tournée vers la tête de pompe (3) de la douille de guidage (7) est en outre sollicitée par la force de ressort d'un ressort (8).
  3. Pompe à haute pression selon la revendication 1 ou 2, caractérisée en ce que la surface frontale tournée vers la pièce de guidage (1) de la douille de guidage (7) est pourvue d'une arête d'attaque (9) qui forme une arête d'étanchéité circulaire ou annulaire s'appliquant contre la pièce de guidage (1).
  4. Pompe à haute pression selon l'une quelconque des revendications 1 à 3, caractérisée en ce que la tête de pompe (3) présente une saillie (11) de forme cylindrique pénétrant dans l'espace de travail (4), sur la surface périphérique extérieure de laquelle s'applique la pression de travail régnant dans l'espace de travail (4) lors du fonctionnement de la pompe.
  5. Pompe à haute pression selon la revendication 4, caractérisée en ce que l'entrée (5) et/ou la sortie (6) pour le carburant à refouler est disposée dans la saillie (11) de forme cylindrique de la tête de pompe (3).
  6. Pompe à haute pression selon l'une quelconque des revendications 1 à 5, caractérisée en ce que seulement la sortie (6) est disposée dans la tête de pompe (3) ou dans la saillie (11) de forme cylindrique de la tête de pompe (3), et le carburant à refouler est acheminé à l'espace de travail (4) par le biais d'un alésage (12) dans la pièce de guidage (1) et par le biais de l'espace de fuite (10), la douille de guidage (7) servant de soupape de remplissage.
  7. Pompe à haute pression selon l'une quelconque des revendications 1 à 5, caractérisée en ce que seulement la sortie (6) est disposée dans la tête de pompe (3) ou dans la saillie (11) de forme cylindrique de la tête de pompe (3) et le carburant à refouler est acheminé à l'espace de travail (4) par le biais de canaux d'écoulement réalisés dans la région de guidage (13) de la pièce de guidage (1) et par le biais de l'espace de fuite (10), la douille de guidage (7) servant de soupape de remplissage.
  8. Pompe à haute pression selon l'une quelconque des revendications 1 à 7, caractérisée en ce que dans le chemin d'alimentation est prévue une unité de dosage pour la régulation de la quantité de refoulement de la pompe.
EP09757358A 2008-06-03 2009-04-21 Pompe a haute pression Not-in-force EP2304220B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810002169 DE102008002169A1 (de) 2008-06-03 2008-06-03 Hochdruckpumpe
PCT/EP2009/054737 WO2009146975A1 (fr) 2008-06-03 2009-04-21 Pompe à haute pression

Publications (2)

Publication Number Publication Date
EP2304220A1 EP2304220A1 (fr) 2011-04-06
EP2304220B1 true EP2304220B1 (fr) 2012-07-11

Family

ID=40910754

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09757358A Not-in-force EP2304220B1 (fr) 2008-06-03 2009-04-21 Pompe a haute pression

Country Status (3)

Country Link
EP (1) EP2304220B1 (fr)
DE (1) DE102008002169A1 (fr)
WO (1) WO2009146975A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE554283T1 (de) * 2009-07-08 2012-05-15 Delphi Tech Holding Sarl Pumpeneinheit
CN104870802B (zh) * 2012-12-20 2018-11-02 罗伯特·博世有限公司 用于内燃机的活塞燃料泵
GB201322264D0 (en) * 2013-12-17 2014-01-29 Delphi Tech Holding Sarl High Pressure Pump

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5899136A (en) * 1996-12-18 1999-05-04 Cummins Engine Company, Inc. Low leakage plunger and barrel assembly for high pressure fluid system
DE19914713C2 (de) * 1999-03-31 2003-10-23 Siemens Ag Druckbeaufschlagte Stelleinrichtung
DE60128000T2 (de) * 2001-01-05 2008-01-17 Hitachi, Ltd. Fluidpumpe und hochdruckkraftstoffförderpumpe
DE10210317A1 (de) * 2002-03-08 2003-09-25 Bosch Gmbh Robert Hochdruckelement für Einspritzanlagen mit verringerter Leckage

Also Published As

Publication number Publication date
WO2009146975A1 (fr) 2009-12-10
DE102008002169A1 (de) 2009-12-10
EP2304220A1 (fr) 2011-04-06

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