EP2235368B1 - Pompe, en particulier pompe à carburant haute pression - Google Patents

Pompe, en particulier pompe à carburant haute pression Download PDF

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Publication number
EP2235368B1
EP2235368B1 EP08860875A EP08860875A EP2235368B1 EP 2235368 B1 EP2235368 B1 EP 2235368B1 EP 08860875 A EP08860875 A EP 08860875A EP 08860875 A EP08860875 A EP 08860875A EP 2235368 B1 EP2235368 B1 EP 2235368B1
Authority
EP
European Patent Office
Prior art keywords
drive shaft
pump
rotation
piston
axis
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
EP08860875A
Other languages
German (de)
English (en)
Other versions
EP2235368A1 (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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2235368A1 publication Critical patent/EP2235368A1/fr
Application granted granted Critical
Publication of EP2235368B1 publication Critical patent/EP2235368B1/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
    • 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
    • F04B1/0408—Pistons

Definitions

  • the invention relates to a pump, in particular high-pressure fuel pump according to the preamble of claim 1.
  • Such a pump is through the US 1 964 245 A known.
  • This pump has a drive shaft with an eccentric to its axis of rotation formed portion on which a ring is rotatably mounted.
  • the pump has at least one pump piston which is supported directly via its piston base or via a support element on the ring and is driven in a stroke movement during the rotation of the drive shaft.
  • the ring has in the region of the system of the piston foot or the support element on at least approximately flat support surface.
  • the support surface of the piston foot or of the support element on the ring is larger than the cross-sectional area of the shaft of the pump piston.
  • the support surface of the piston foot or of the support element is usually circular and should be as large as possible to avoid tilting movements of the ring relative to the piston foot or support element.
  • the extension of the support surface of the piston foot or of the support element in the tangential direction to the axis of rotation of the drive shaft is greater than the extent thereof in the direction of the axis of rotation of the drive shaft.
  • it can lead to tilting of the ring.
  • this tilting can lead to damage to the ring and / or the pump piston or support element at high speeds of the drive shaft.
  • the pump should have a compact design as possible, the placement of a piston foot or support element with a large support surface, in particular in the direction of the axis of rotation of the drive shaft, difficult.
  • the pump according to the invention with the features of claim 1 has the advantage that tilting of the ring can be effectively prevented by the formation of the support surface of the piston foot or the support member.
  • FIG. 1 a pump in a longitudinal section
  • FIG. 2 an enlarged section of the pump in a cross section along line II-II in FIG. 1 according to a first embodiment
  • FIG. 3 the pump in a section along line III-III in FIG. 2
  • FIG. 4 a section of the pump in section along line IV-IV in FIG. 2
  • FIG. 5 the pump according to a second embodiment
  • FIG. 6 the pump according to a third embodiment.
  • a pump which is in particular a high-pressure fuel pump for a fuel injection device of an internal combustion engine.
  • the pump has a housing 10, which may be designed in several parts and in which a rotationally driven drive shaft 12 is arranged.
  • the drive shaft 12 is in the housing 10 via two spaced apart in the direction of the axis of rotation 13 of the drive shaft 12 bearings 14th and 15 rotatably mounted.
  • the bearings 14,15 can be arranged in different parts of the housing 10.
  • the direction of rotation of the drive shaft 12 is illustrated by an arrow 17.
  • the drive shaft 12 In a region lying between the two bearing points 14,15 the drive shaft 12 has an eccentric to its axis of rotation 13 formed portion 20 which has a cylindrical shape and on which a ring 22 is rotatably mounted.
  • one or more pump elements 24 are provided, each having a pump piston 26 which is at least indirectly driven by the portion 20 of the drive shaft 12 and the ring 22 mounted thereon in a lifting movement.
  • the pump has two pump elements 24, these are for example as in FIG. 1 represented diametrically opposite each other, that is arranged to rotate 180 ° about the axis of rotation 13 of the drive shaft 12 to each other. If the pump has three pump elements 24, then these are arranged, for example, rotated by 120 ° about the axis of rotation 13 of the drive shaft 12 to each other.
  • the pump piston 26 is slidably guided in each case in a cylinder bore 28 of a housing part of the pump and limited with its the drive shaft 12 facing away from a pump chamber 30.
  • suction stroke of the pump piston 26 sucks this via an inlet valve 32 fuel from an inlet in the pump working space 30 at.
  • delivery stroke of the pump piston 26 compresses the fuel in the pump chamber 30 and displaces fuel via an outlet valve 34 into an outlet, which leads, for example, to a high-pressure accumulator.
  • the return movement of the pump piston 26 during its suction stroke is effected by a return spring 36.
  • the ring 22 has, for each pump piston 26, an at least approximately planar contact surface 40 on which the pump piston 26 is supported directly with its piston foot 42 or via a support element 54 or 64.
  • FIG. 2 the pump is shown according to a first embodiment, in which the pump piston 26 directly with his piston 42 on the foot Bearing surface 40 of the ring 22 is supported.
  • the support surface 46 of the piston foot 42 is larger than the cross-sectional area of the shaft of the pump piston 26, which is arranged in the cylinder bore 28.
  • the return spring 36 is clamped between the piston 42 and a housing part of the pump.
  • the support surface 46 is at least approximately flat and has as in FIG. 3 shown in the tangential direction with respect to the axis of rotation 13 of the drive shaft 12 a greater extent than in the direction of the axis of rotation 13.
  • the extension of the support surface 46 in the tangential direction is denoted by a and their extension in the direction of the axis of rotation 13 is denoted by b.
  • the support surface 46 as in the Figures 2 and 3 represented in the tangential direction with respect to the rotational axis 13 of the drive shaft 12, starting from the longitudinal axis 27 of the pump piston 26 against the direction of rotation 17 of the drive shaft 12 a greater extent than in the direction of rotation 17 of the drive shaft 12.
  • the extension of the support surface 46 against the direction of rotation 17 is c designated and whose extension in the direction of rotation 17 is designated d.
  • the pump piston 26 is arranged such that its longitudinal axis 27 does not intersect the axis of rotation 13 of the drive shaft 12 but extends offset in the direction of rotation 17 of the drive shaft 12 with respect to the axis of rotation 13.
  • the longitudinal axis 27 of the pump piston 26 thus extends in the area of the support surface 46 offset by a dimension f with respect to a rotation axis 13 of the drive shaft 12 containing radial plane 48 in the direction of rotation 17.
  • the support surface 46 is preferably formed such that viewed in the tangential direction with respect to the axis of rotation 13 of the drive shaft 12 whose center M is at least approximately in the radial plane 48, as in the Figures 2 and 3 is shown. With respect to the longitudinal axis 27 of the pump piston 26, the support surface 46 is thus formed asymmetrically, since this counter to the direction of rotation 17 has the greater extent c and in the direction of rotation 17, the smaller extension d. With regard to the radial plane 48, however, the support surface 46 is formed symmetrically with its center M in the radial plane 48.
  • the support surface 46 is for example as in FIG. 3 shown formed rounded at their pointing in the tangential direction to the axis of rotation 13 of the drive shaft 12 edges and formed at their pointing in the direction of the axis of rotation 13 edges at least approximately flat.
  • the pump is shown in sections according to a second embodiment, in which the basic structure is the same as in the first embodiment, the pump piston 26 but supported by a plate-shaped support member 54 on the contact surface 40 of the ring 22.
  • the support element 54 is connected to the piston foot 42 of the pump piston 26, which has a relative to the shaft of the pump piston 26 enlarged cross-sectional area, but has a smaller cross-sectional area than in the first embodiment.
  • the support member 54 has on its side facing away from the ring 22 a recess 55 into which the piston 42 is inserted.
  • the connection between the piston foot 42 and the support member 54 may be rigid or articulated.
  • connection of the piston foot 42 with the support element 54 can take place, for example, by means of a clamp-like fastening element 58 which engages over the piston foot 42 and the support element 54.
  • the support surface 56 of the support member 54, with this comes to rest on the contact surface 40 on the ring 22 is the same design as the support surface 46 of the piston 42 in accordance with the first embodiment.
  • the pump is shown in sections according to a third embodiment, in which the basic structure is again the same as in the first embodiment, the pump piston 26 but supported by a support member 64 on the contact surface 40 of the ring 22.
  • the support member 64 is arranged as an insert in a plunger 68, which in is formed substantially hollow cylindrical.
  • the plunger 68 is slidably guided over its outer circumference in a bore of a housing part of the pump or over its inner circumference on a cylindrical projection of a housing part of the pump.
  • the pump piston 26 protrudes into the plunger 68 and rests with its piston foot 42 on the side facing away from the ring 22 of the support member 64.
  • the return spring 36 is supported on a spring plate 70 which abuts on the piston foot 42 as well as on a projection 72 projecting radially inward on the plunger 68 and thus acts on both the plunger 68 and the pump piston 26 and via this the support element 64 to the ring 22 out.
  • the support member 64 has a ring 22 facing and abutting the abutment surface 40 support surface 66 which is formed the same as the support surface 46 of the piston 42 according to the first embodiment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)

Claims (4)

  1. Pompe, en particulier pompe à carburant haute pression, comprenant un arbre d'entraînement (12) entraîné en rotation, qui présente une portion (20) excentrique par rapport à son axe de rotation (13), sur laquelle est montée à rotation une bague (22), avec au moins un piston de pompe (26) qui s'appuie directement par le biais de sa base de piston (42) ou par le biais d'un élément de support (54 ; 64) contre la bague (22) et qui est entraîné en un mouvement alternatif lors du mouvement de rotation de l'arbre d'entraînement (12), la bague (22) présentant, dans la région du support de la base du piston (42) ou de l'élément de support (54 ; 64) une face d'appui (40) au moins approximativement plane et la face de support (46 ; 56 ; 66) de la base de piston (42) ou de l'élément de support (54 ; 64) sur la bague (22) étant plus grande que la surface en section transversale de la tige du piston de pompe (26), et l'étendue (a) de la face de support (46 ; 56 ; 66) de la base de piston (42) ou de l'élément de support (54 ; 64) dans la direction tangentielle par rapport à l'axe de rotation (13) de l'arbre d'entraînement (12) étant plus grande que son étendue (b) dans la direction de l'axe de rotation (13) de l'arbre d'entraînement (12), caractérisée en ce que l'étendue (c) de la face de support (46 ; 56; 66) de la base de piston (42) ou de l'élément de support (54 ; 64) dans la direction tangentielle par rapport à l'axe de rotation (13) de l'arbre d'entraînement (12) partant de l'axe longitudinal (27) du piston de pompe (26) dans le sens opposé au sens de rotation (17) de l'arbre d'entraînement (12) est plus grande que son étendue (d) dans le sens de rotation (17) de l'arbre d'entraînement (12).
  2. Pompe selon la revendication 1, caractérisée en ce que l'au moins un piston de pompe (26) est disposé de telle sorte que son axe longitudinal (27) s'étende de manière décalée par rapport à l'axe de rotation (13) de l'arbre d'entraînement (12) dans le sens de rotation (17) de l'arbre d'entraînement (12).
  3. Pompe selon la revendication 1 ou 2, caractérisée en ce que, dans la direction tangentielle par rapport à l'axe de rotation (13) de l'arbre d'entraînement (12), le centre (M) de la face de support (46 ; 56 ; 66) de la base de piston (42) ou de l'élément de support (54 ; 64) est disposé au moins approximativement dans un plan radial (48) contenant l'axe de rotation (13) de l'arbre d'entraînement (12).
  4. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce que la bague (22) présente, dans la direction de l'axe de rotation (13) de l'arbre d'entraînement (12), à côté de la face d'appui (40), des faces de guidage (50) saillant par rapport à celle-ci, entre lesquelles la base de piston (42) ou l'élément de support (54 ; 64) est guidé dans la direction de l'axe de rotation (13) de l'arbre d'entraînement (12) de manière essentiellement non coulissante.
EP08860875A 2007-12-17 2008-11-14 Pompe, en particulier pompe à carburant haute pression Not-in-force EP2235368B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007060772A DE102007060772A1 (de) 2007-12-17 2007-12-17 Pumpe, insbesondere Kraftstoffhochdruckpumpe
PCT/EP2008/065590 WO2009077274A1 (fr) 2007-12-17 2008-11-14 Pompe, en particulier pompe à carburant haute pression

Publications (2)

Publication Number Publication Date
EP2235368A1 EP2235368A1 (fr) 2010-10-06
EP2235368B1 true EP2235368B1 (fr) 2011-08-10

Family

ID=40325755

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08860875A Not-in-force EP2235368B1 (fr) 2007-12-17 2008-11-14 Pompe, en particulier pompe à carburant haute pression

Country Status (7)

Country Link
US (1) US8522755B2 (fr)
EP (1) EP2235368B1 (fr)
JP (1) JP5044701B2 (fr)
CN (1) CN101903654B (fr)
AT (1) ATE519944T1 (fr)
DE (1) DE102007060772A1 (fr)
WO (1) WO2009077274A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5925458B2 (ja) * 2010-10-04 2016-05-25 Juki株式会社 ミシンの給油ポンプ
DE102011002701A1 (de) * 2011-01-14 2012-07-19 Robert Bosch Gmbh Hochdruckpumpe
JP5633387B2 (ja) * 2011-01-24 2014-12-03 株式会社デンソー 燃料供給ポンプ
EP2628942B1 (fr) * 2012-02-14 2014-10-01 Continental Automotive GmbH Pompe et système d'injection de carburant à rail commun
DE102013211755A1 (de) 2013-06-21 2014-12-24 Robert Bosch Gmbh Hochdruckpumpe
US20150136051A1 (en) * 2013-11-15 2015-05-21 Delphi Technologies, Inc. Camshaft and follower geometry
DE102014220746B3 (de) * 2014-10-14 2016-02-11 Continental Automotive Gmbh Kraftstoffpumpe
CN105715473A (zh) * 2016-04-01 2016-06-29 郑州科技学院 一种多缸高压径向柱塞泵
CN108571432A (zh) * 2018-06-22 2018-09-25 上海坤释流体科技有限公司 一种耐腐蚀偏心轮泵

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1964245A (en) 1931-09-22 1934-06-26 Hydraulic Press Mfg Co Constant delivery radial piston pump
US5382140A (en) * 1993-02-11 1995-01-17 Elasis Sistema Ricerca Fiat Nel Mezzogiorno Radial-piston pump
DE19814506A1 (de) 1998-04-01 1999-10-14 Bosch Gmbh Robert Radialkolbenpumpe zur Kraftstoffhochdruckversorgung
DE19816044C2 (de) * 1998-04-09 2002-02-28 Bosch Gmbh Robert Radialkolbenpumpe zur Kraftstoffhochdruckerzeugung
JP3891240B2 (ja) * 1998-11-05 2007-03-14 株式会社デンソー 燃料噴射ポンプ
DE10058050C1 (de) * 2000-11-23 2002-03-21 Ats Spartec Inc Radialkolbenpumpe
DE10150351A1 (de) * 2001-10-15 2003-05-08 Bosch Gmbh Robert Pumpenelement und Kolbenpumpe zur Kraftstoffhochdruckerzeugung
DE10256528A1 (de) 2002-12-04 2004-06-24 Robert Bosch Gmbh Hochdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine
DE20313014U1 (de) * 2003-08-21 2004-12-23 Robert Bosch Gmbh Hochdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine
DE102004023541A1 (de) * 2004-05-13 2005-12-01 Robert Bosch Gmbh Hochdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine

Also Published As

Publication number Publication date
US8522755B2 (en) 2013-09-03
DE102007060772A1 (de) 2009-06-18
EP2235368A1 (fr) 2010-10-06
CN101903654A (zh) 2010-12-01
JP2011506838A (ja) 2011-03-03
ATE519944T1 (de) 2011-08-15
WO2009077274A1 (fr) 2009-06-25
JP5044701B2 (ja) 2012-10-10
US20100269795A1 (en) 2010-10-28
CN101903654B (zh) 2013-01-02

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