EP2255089B1 - Pompe à carburant - Google Patents

Pompe à carburant Download PDF

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Publication number
EP2255089B1
EP2255089B1 EP09723427A EP09723427A EP2255089B1 EP 2255089 B1 EP2255089 B1 EP 2255089B1 EP 09723427 A EP09723427 A EP 09723427A EP 09723427 A EP09723427 A EP 09723427A EP 2255089 B1 EP2255089 B1 EP 2255089B1
Authority
EP
European Patent Office
Prior art keywords
pump
shaft
sealing ring
shaft sealing
fuel
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
EP09723427A
Other languages
German (de)
English (en)
Other versions
EP2255089A1 (fr
Inventor
Friedrich Boecking
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 EP2255089A1 publication Critical patent/EP2255089A1/fr
Application granted granted Critical
Publication of EP2255089B1 publication Critical patent/EP2255089B1/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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/10—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type
    • F04B23/103—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type being a radial piston pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/005—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of dissimilar working principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C15/0038—Shaft sealings specially adapted for rotary-piston machines or pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings

Definitions

  • the invention relates to a fuel pump, in particular a pump arrangement with an external gear pump. Specifically, the invention relates to the field of fuel injection systems of air compressing, self-igniting internal combustion engines.
  • the known pump arrangement is particularly suitable for a common rail injection system.
  • the known pump arrangement comprises a radial piston pump with a drive shaft mounted in a pump housing and a low pressure pump upstream of the radial piston pump.
  • leakage occurs in the region of the drive train from the gear pump into the interior of the radial piston pump.
  • the fuel pump according to the invention with the features of claim 1, namely that in the opening a shaft seal is arranged, which seals the first pump part relative to the second pump part, that the shaft seal on an inner piece has an at least substantially circular sealing edge and that the shaft seal with its circular Sealing edge rests against the pump shaft, has the advantage that the structure of the fuel pump is simplified. Specifically, the sealing of the first pump part with the gear pump can be simplified. Furthermore, it is advantageous that the shaft sealing ring has on its inside an at least substantially circular sealing edge and that the shaft seal rests with its circular sealing edge on the pump shaft. As a result, a reliable seal in the region between the inside of the shaft sealing ring and the pump shaft is achieved even at relatively high speeds of the pump shaft.
  • the high-pressure pump part may comprise a radial piston pump, which is connected upstream of the gear pump of the first pump part.
  • the first pump part can be attached in a relatively simple manner to the second pump part, for example, one or more pins or the like may be provided, by means of which the first pump part is centered to the high-pressure pump housing of the second pump part. The requirements for the tightness are reduced, with a cover of the first pump part can be omitted.
  • the first pump part may, for example, be surrounded by a relatively simply designed housing part, which is connected to the high-pressure pump housing.
  • the shaft sealing ring lies on its outer side on an inner surface of the opening, which is provided in the housing part separating the two pump parts.
  • the inner surface of the opening is preferably designed as a cylinder jacket, so that it has a uniform curvature in the circumferential direction and a flat, in particular full-surface, concern of the shaft seal on the cylinder jacket-shaped inner surface of the opening is possible. This results in a high sealing effect in the area between the inner surface of the opening and the outside of the shaft seal achieved.
  • a clamping element which presses the circular sealing edge of the shaft seal circumferentially against the pump shaft.
  • the clamping element thereby biases the shaft sealing ring with respect to the pump shaft, so that a high contact pressure in the radial direction is achieved on the pump shaft, which allows a high sealing effect.
  • the clamping element can, for example, as a clamping ring be configured, which is elastically expanded in the shaft seal integrated.
  • the clamping ring can be formed for example from a metal ring.
  • the first pump part may also have other elements in addition to one or more gears.
  • the first pump part may have a coupling, wherein the gear is operatively connected by means of the coupling with the pump shaft.
  • the design of the pump shaft is adapted to the respective application.
  • the pump shaft may be designed as a polygonal shaft or as a camshaft.
  • Fig. 1 shows a fuel pump 1 in a side view according to a first embodiment of the invention.
  • the fuel pump 1 can be designed in particular as a pump arrangement with an external gear pump for fuel injection systems of air-compressing, self-igniting internal combustion engines.
  • a preferred use of the fuel pump 1 is for a fuel injection system with a fuel rail, a so-called common rail that stores diesel fuel under high pressure.
  • the fuel pump 1 according to the invention is also suitable for other applications.
  • the fuel pump 1 has a first pump part 2 and a second pump part 3.
  • the second pump portion lies behind the first pump part 2 and is partially covered by the first pump part 2.
  • an intake manifold 4 is provided, via the fuel from a Tank or the like can be supplied.
  • the fuel first passes through the second pump part 3 to a gear pump provided in the first pump part 2, which is connected upstream of a high-pressure pump provided in the second pump part 3.
  • the first pump part 2 therefore has the function of a low-pressure pump
  • the second pump part 3 mainly has the function of a high-pressure pump.
  • the high-pressure pump of the second pump part 3 can be designed in particular as a radial piston pump.
  • the first pump part 2 has gears 5, 6, whose position in the Fig. 1
  • the gears 5, 6 are covered by a cover 7 which is connected at fixed points 8A, 8B, 8C, 8D to a high-pressure pump housing 9 of the second pump part 3.
  • the cover 7 preferably has essentially the function that To cover gears 5, 6 and possibly other components of the first pump part 2.
  • the cover 7 has no special sealing means and is also provided with respect to the attachment to the high-pressure pump housing 9 with no special seal.
  • the cover 7 is in particular not designed as a lid. Thus, the cover 7 can be easily manufactured.
  • the first pump part 2 is thus designed without cover and thus also inexpensive to manufacture.
  • Fig. 2 shows an excerpted section through the in Fig. 1 shown fuel pump 1 along the designated II section line.
  • the cover 7 is connected to the fixing point 8 B with a housing part 16 of the high-pressure pump housing 9 of the second pump part 3.
  • the connection can be made for example by means of a screw.
  • the housing part 16 is in this embodiment part of the second pump part 3.
  • the housing part 16 separates the first pump part 2 of the second pump part 3. In this case, the housing part 16 is disposed substantially between the pump parts 2, 3 of the fuel pump 1
  • a bearing pin 17 is formed, which has a bearing surface 18.
  • a gear 19 is mounted, which is in engagement with a further gear 20 to form a gear pump.
  • the pump shaft 15 of the fuel pump 1 is inside the second pump part 3 stored and aligned axially with the gear 19.
  • the pump shaft 15 is driven so that it rotates about an axis 21.
  • the pump shaft 15 protrudes through an opening 22 in the housing part 16.
  • the pump shaft 15 projects partially into an adjacent to the housing part 16, bounded by the cover 7 space 23 of the first pump part 2.
  • a clutch 24 is also arranged.
  • An example designed as a two-flat end 25 of the pump shaft 15 is connected in a suitable manner with the coupling 24, so that via the coupling 24 is an operative connection between the pump shaft 15 and the gear 19.
  • the end 25 of the pump shaft 15 is at least substantially in the space 23 of the first pump part. 2
  • an at least substantially cylindrical jacket-shaped inner surface 30 of the opening 22 is formed on the housing part 16.
  • the axis 21 of the pump shaft 15 is oriented at least substantially centrally to the cylinder jacket-shaped inner surface 30.
  • a shaft sealing ring 31 is arranged, which, viewed in the circumferential direction, has a profile opened on one side. In this exemplary embodiment, the profile is opened towards the second pump part 3.
  • the shaft sealing ring 31 is configured such that an outer surface 32 of the shaft sealing ring 31, which is at least substantially cylindrical in shape, is formed. The shaft sealing ring 31 rests flat on this outer surface 32 against the cylinder jacket-shaped inner surface 30 of the opening 22, so that a reliable sealing effect is provided in the region between the outer surface 32 of the shaft sealing ring 31 and the inner surface 30 of the opening 22.
  • the sealing ring has in profile a directed toward the pump shaft 15, triangular inner piece 33.
  • the inner piece 33 of the shaft sealing ring 31 is configured such that a circular sealing edge 34 is provided on the shaft sealing ring 31, at which there is contact between the shaft sealing ring 31 and the pump shaft 15.
  • the shaft sealing ring 31 lies peripherally on the pump shaft 15 at the circular sealing edge 34 at.
  • the shaft sealing ring 31 has a tensioning element designed as a clamping ring 35, which is inserted into the shaft sealing ring 31 which is open on one side in the profile.
  • the clamping element 35 may be formed, for example, of a metal ring.
  • the clamping element 35 is resiliently biased when introduced into the shaft seal 31, wherein in the assembled state, in the Fig.
  • the shaft seal 31 generates both in the region of its outer surface 32 to the housing part 16 out as well as in the region of its sealing edge 34 to the pump shaft 15 toward a reliable sealing effect.
  • the shaft seal 31 therefore seals the second pump part 3 reliably relative to the first pump part 2.
  • no or at most a slight leakage occurs from the second pump part 3 in the space 23 of the first pump part 2.
  • This makes it possible for the first pump part 2 to be designed without seals, specifically that the first pump part 2 is designed to be cap-free. Therefore, a cover of the first pump part 2 with the cover 7 is sufficient.
  • the pump shaft 15 may be configured as a polygonal shaft or as a camshaft.
  • the fuel pump 1 of the embodiment of the invention has the advantage that the shaft seal 31 is integrated in the opening 22 of the housing part 16.
  • the shaft seal 31 may be formed substantially of an elastic material, for example, an elastic plastic, wherein the clamping element 35 of the shaft seal 31 is preferably formed of a metallic material

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (8)

  1. Pompe à carburant (1) pour installations d'injection de carburant de moteurs à combustion interne à auto-allumage et suralimentation d'air, comprenant une première partie de pompe (2) qui présente une pompe à engrenage et au moins une deuxième partie de pompe (3) qui est configurée sous forme de partie de pompe à haute pression, la première partie de pompe (2) étant séparée de la deuxième partie de pompe (3) au moyen d'au moins une partie de boîtier (16) d'un boîtier de pompe à haute pression (9) de la deuxième partie de pompe (3), et un arbre de pompe (15) monté à l'intérieur de la deuxième partie de pompe (3) pénétrant dans la partie de boîtier (16) à travers une ouverture (22), caractérisée en ce que dans l'ouverture (22) est disposée une bague d'étanchéité pour arbre (31) qui étanchéifie la première partie de pompe (2) par rapport à la deuxième partie de pompe (3), en ce que la bague d'étanchéité pour arbre (31) présente, sur une pièce interne (33), une arête d'étanchéité (34) de forme circulaire et en ce que la bague d'étanchéité pour arbre (31) s'applique avec son arête d'étanchéité (34) de forme circulaire contre l'arbre de pompe (15).
  2. Pompe à carburant selon la revendication 1, caractérisée en ce que la bague d'étanchéité pour arbre (31) présente une surface extérieure (32) et en ce que la bague d'étanchéité pour arbre (31) s'applique au niveau de sa surface extérieure (32) au moins de manière indirecte contre une surface intérieure (30) de l'ouverture (22).
  3. Pompe à carburant selon la revendication 2, caractérisée en ce que la surface intérieure (30) de l'ouverture (22), contre laquelle la bague d'étanchéité pour arbre (31) s'applique avec sa surface extérieure (32), est réalisée au moins essentiellement sous forme d'enveloppe cylindrique, et en ce que la bague d'étanchéité pour arbre (31) s'applique à plat contre la surface intérieure (30) en forme d'enveloppe cylindrique de l'ouverture (22).
  4. Pompe à carburant selon l'une quelconque des revendications précédentes, caractérisée en ce que la bague d'étanchéité pour arbre (31) présente un élément de serrage (35), notamment une bague de serrage, et en ce que l'élément de serrage (35) presse la pièce interne (33) de la bague d'étanchéité pour arbre (31) avec l'arête d'étanchéité (34) de forme circulaire circonférentiellement contre l'arbre de pompe (15).
  5. Pompe à carburant selon la revendication 4, caractérisée en ce que la bague d'étanchéité pour arbre (31) présente un profil ouvert d'un côté, et en ce que l'élément de serrage (35) est inséré avec une précontrainte dans la bague d'étanchéité pour arbre (31).
  6. Pompe à carburant selon l'une quelconque des revendications 1 à 5, caractérisée en ce que la première partie de pompe (2) est configurée sans garniture d'étanchéité.
  7. Pompe à carburant selon la revendication 6, caractérisée en ce que la première partie de pompe (2) est réalisée sans couvercle.
  8. Pompe à carburant selon l'une quelconque des revendications 1 à 7, caractérisée en ce que la première partie de pompe (2) présente un accouplement (24) et au moins une roue dentée (19), la roue dentée (19) étant en liaison fonctionnelle au moyen de l'accouplement (24) avec l'arbre de pompe (15).
EP09723427A 2008-03-17 2009-01-23 Pompe à carburant Not-in-force EP2255089B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008000700A DE102008000700A1 (de) 2008-03-17 2008-03-17 Brennstoffpumpe
PCT/EP2009/050751 WO2009115357A1 (fr) 2008-03-17 2009-01-23 Pompe à carburant

Publications (2)

Publication Number Publication Date
EP2255089A1 EP2255089A1 (fr) 2010-12-01
EP2255089B1 true EP2255089B1 (fr) 2012-09-26

Family

ID=40602542

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09723427A Not-in-force EP2255089B1 (fr) 2008-03-17 2009-01-23 Pompe à carburant

Country Status (4)

Country Link
EP (1) EP2255089B1 (fr)
CN (1) CN101978163A (fr)
DE (1) DE102008000700A1 (fr)
WO (1) WO2009115357A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20130239A1 (it) * 2013-02-20 2014-08-21 Bosch Gmbh Robert Gruppo pompa per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna
DE102014211946A1 (de) 2014-06-23 2015-12-24 Robert Bosch Gmbh Zahnradpumpe für ein Kraftstoffeinspritzsystem

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4103986C2 (de) 1990-02-10 1999-11-25 Zahnradfabrik Friedrichshafen Doppelpumpe
DE4217259A1 (de) 1992-05-25 1992-11-12 Zahnradfabrik Friedrichshafen Doppelpumpe
DE19736160A1 (de) * 1997-08-20 1999-02-25 Bosch Gmbh Robert Pumpenanordnung zur Kraftstoffhochdruckversorgung bei Kraftstoffeinspritzsystemen von Brennkraftmaschinen
JP2005016514A (ja) * 2003-06-04 2005-01-20 Denso Corp 燃料供給装置
CN2826094Y (zh) * 2005-09-29 2006-10-11 蒋春雷 一种改进回油线结构的油封

Also Published As

Publication number Publication date
EP2255089A1 (fr) 2010-12-01
CN101978163A (zh) 2011-02-16
DE102008000700A1 (de) 2009-09-24
WO2009115357A1 (fr) 2009-09-24

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