EP2649313B1 - 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
EP2649313B1
EP2649313B1 EP11794104.7A EP11794104A EP2649313B1 EP 2649313 B1 EP2649313 B1 EP 2649313B1 EP 11794104 A EP11794104 A EP 11794104A EP 2649313 B1 EP2649313 B1 EP 2649313B1
Authority
EP
European Patent Office
Prior art keywords
pump
drive shaft
medium
chamber
cam
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
EP11794104.7A
Other languages
German (de)
English (en)
Other versions
EP2649313A1 (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 EP2649313A1 publication Critical patent/EP2649313A1/fr
Application granted granted Critical
Publication of EP2649313B1 publication Critical patent/EP2649313B1/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
    • F04B1/0413—Cams

Definitions

  • the invention relates to a pump, in particular high-pressure fuel pump, according to the preamble of claim 1.
  • Such a pump in the form of a high-pressure fuel pump is through DE 10 2004 004 705 A1 known.
  • This pump has at least one pump element which has a pump piston driven at least indirectly by a rotating drive shaft in a stroke movement, wherein the drive shaft has at least one cam. Between the pump piston and the cam, a roller tappet is provided with a roller running on the cam.
  • the pump has a pump housing, in which the drive shaft is arranged, wherein the interior of the pump housing via a feed liquid medium is supplied and discharged via a discharge liquid medium. As the medium, the fuel is supplied to the interior of the pump housing, which is to be pumped by the pump.
  • the supplied into the interior of the pump housing fuel lubrication and / or cooling of the drive range of the pump is achieved, however, there is no targeted supply of medium to the drive area but the medium is distributed throughout the interior of the pump housing. Since no targeted mixing of the medium takes place inside the pump housing, the medium can have a high temperature around the drive region. At high load of the pump, however, the lubrication and / or cooling of the drive portion, in particular the contact area between the roller and the cam and the roller tappet may not be sufficient. This can lead to wear and eventually to failure of the pump.
  • the pump according to the invention with the features according to claim 1 has the advantage that in the space defined by the cam and the pump housing space by the rotational movement of the cam specifically a mixing of the medium present in the space takes place. As a result, high temperatures in the drive area and thus wear can be avoided.
  • FIG. 1 a pump in a longitudinal section
  • FIG. 2 one in FIG. 1 with II designated section of the pump in an enlarged view
  • FIG. 3 the pump in a cross section along line III-III in FIG. 2
  • FIG. 4 the pump in a view in the direction of arrow IV in FIG. 3 ,
  • 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 is designed in several parts and in which a drive shaft 14 driven in rotation is rotatably mounted about a rotation axis 15.
  • the drive shaft 14 has at least one cam 16.
  • the cam 16 may be a single or multiple cam.
  • the pump has at least one or more pump elements 18, each with a pump piston 20 which is driven by the cam 16 of the drive shaft 14 at least indirectly in a lifting movement in at least approximately radial direction to the axis of rotation 15 of the drive shaft 14.
  • the pump piston 20 is tightly guided in a cylinder bore 22 of a housing part 24 of the pump. With its end facing away from the drive shaft 14, the pump piston 20 in the cylinder bore 22 defines a pump working chamber 26.
  • the pump working chamber 26 has an inlet check valve 30 opening into this connection with an inlet 32 leading, for example, from a feed pump, via which the pump working chamber 26 radially inward to the axis of rotation 15 of the drive shaft 14 directed suction stroke of the pump piston 20 is filled with fuel.
  • the pump working chamber 26 also has an outlet check valve 34 which opens out of this connection with a drain 36 which leads, for example, to a high-pressure fuel accumulator 38 and fuel via the delivery stroke of the pump piston 20 directed radially outward from the rotational axis 15 of the drive shaft 14 the pump working space 26 is displaced.
  • the pump piston 20 is supported indirectly via an element in the form of a roller tappet 42 on the cam 16 of the drive shaft 14.
  • the roller tappet 42 comprises a hollow cylindrical tappet body 44, in which a roller shoe 46 is used as a support element.
  • the roller shoe 46 has on its side facing the drive shaft 14 a recess 48, which forms a bearing for a cylindrical roller 50, which is thus rotatably mounted about an axis 51 in the recess 48.
  • the roller 50 runs on the cam 16 of Drive shaft 14 from.
  • the pump piston 20 is coupled in the direction of its longitudinal axis 21 with the roller tappet 42.
  • the plunger body 44 is slidably guided in a receptacle 52 in a part 54 of the pump housing 10 in at least approximately vertical direction to the axis of rotation 15 of the drive shaft 14.
  • the receptacle 52 is formed for example as a bore.
  • the roller tappet 42 and the pump piston 20 connected thereto are acted upon by a spring 40 towards the cam 16.
  • the pump housing 10 includes as in FIG. 2 shown in the base housing part 54, the bore 52 is formed to guide the plunger body 44 and in this, a first bearing 58 is arranged for the drive shaft 14 in the main housing part 54.
  • a second bearing 60 is arranged for the drive shaft 14.
  • the basic housing part 54 has a recess 62, in which the at least one cam 16 of the drive shaft 14 is arranged.
  • the recess 62 is closed in the direction of the axis of rotation 15 of the drive shaft 14.
  • a space 64 is limited, which extends over the circumference of the cam 16.
  • a feed 66 and a discharge 68 of liquid medium As a medium is preferably used by the pump to be pumped fuel.
  • the supply 66 and discharge 68 of the medium are formed for example as bores which extend through the base housing part 54.
  • the feed 66 and discharge 68 of the medium open at the end face of the recess 62 pointing in the direction of the axis of rotation 15 of the drive shaft 14.
  • the mouth of the feed 66 and the discharge 68 in the space 64 are at least in the radial direction with respect to the axis of rotation 15 of the drive shaft 14 disposed about the top dead center of the cam 16 or higher.
  • the top dead center of the cam 16 is its region 17 with the greatest radial distance from the rotation axis 15 of the drive shaft 14.
  • the supply 66 and discharge 68 thus open in relation to the rotation axis 15 of the drive shaft 14 outer edge region of the space 64th
  • the supply 66 of the medium is preferably arranged in the direction of rotation 13 of the drive shaft 14 at a short distance after the pump element 18 and the discharge 68 of the medium is arranged at a short distance in front of the pump element 18.
  • the discharge 68 is seen in the direction of rotation 13 of the drive shaft 14 is preferably arranged at an angle of about 270 ° with respect to the feed 66.
  • the medium entering the space 64 through the feed 66 is carried along by the cam 16 during the rotational movement of the drive shaft 14 in its direction of rotation 13 and leakage of the medium through the outlet 68 is possible only after an angular range of about 270 °.
  • a circumferential groove 70 is preferably provided, which is in communication with the space 64.
  • the pump as in FIG. 3 shown having two pump elements 18a and 18b, wherein the second pump element 18b is arranged with respect to the first pump element 18a seen in the direction of rotation 13 of the drive shaft 14 offset by about 90 °. Viewed in the direction of rotation 13 of the drive shaft 14, an angle of approximately 90 ° is present between the first and second pump element 18a, 18b, and an angle of approximately 270 ° exists between the second and first pump element 18b, 18a.
  • the two pump elements 18a, 18b are preferably at least substantially identical.
  • the feed 66 of the medium opens into the space 64 in the direction of rotation 13 of the drive shaft 14 preferably in the 270 ° angle range between the two pump elements 18a, 18b at a short distance to the second pump element 18b and the discharge 68 of medium preferably opens into the space 64 at least approximately midway in the 90 ° angle region between the two pump elements 18a, 18b and thus offset by an angle of about 270 ° with respect to the feed 66.
  • FIG. 4 the pump is in a view in the direction of arrow IV according to FIG. 3 shown, wherein the pump housing 10 is partially not shown to make the two pump elements 18a and 18b visible.
  • the supply 66 and discharge 68 of the medium are also shown for reasons of clarity, although they run through the basic housing part 54, not shown.
  • the caused by the cam 16 flow of the medium in the space 64 is illustrated by arrows 72.
  • the supply 66 pressurized medium is supplied into the space 64, preferably fuel, which is conveyed by the pump into the memory 38.
  • the fuel is conveyed by a feed pump 80 from a fuel tank 82 via the supply 66 into the space 64, flows through the discharge 68 from the space 64 and passes through the inlet 32 to the inlet of the pump or the elements 18a, 18b.
  • a metering unit 84 can be provided, through which the amount of fuel sucked by the pump elements 18a, 18b is variably adjustable.

Landscapes

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

Claims (10)

  1. Pompe, en particulier pompe à carburant haute pression, comprenant au moins un élément de pompe (18) qui comprend un piston de pompe (20) entraîné au moins indirectement suivant un mouvement de va-et-vient par un arbre d'entraînement rotatif (14), l'arbre d'entraînement (14) comprenant au moins une came (16), comprenant un carter de pompe (10) dans lequel l'arbre d'entraînement (14) est disposé, un milieu liquide étant acheminé jusqu'à l'intérieur du carter de pompe (10) par le biais d'une amenée (66) et un milieu liquide étant évacué par le biais d'une évacuation (68), caractérisée en ce qu'un espace (64) s'étendant sur la périphérie de l'au moins une came (16) est délimité par le carter de pompe (10) et l'au moins une came (16) de l'arbre d'entraînement (14) dans l'intérieur du carter de pompe (10), dans lequel espace débouchent l'amenée (66) et l'évacuation (68) du milieu liquide.
  2. Pompe selon la revendication 1, caractérisée en ce que, vu dans le sens de rotation (13) de l'arbre d'entraînement (14), l'évacuation (68) du milieu débouche dans l'espace (64) de manière décalée d'au moins approximativement 180°, de préférence d'approximativement 270° par rapport à l'amenée (66) du milieu.
  3. Pompe selon la revendication 1 ou 2, caractérisée en ce que l'amenée (66) et/ou l'évacuation (68) du milieu dans l'espace (64) débouche(nt), vu dans la direction radiale par rapport à l'axe de rotation (15) de l'arbre d'entraînement (14), dans l'espace (64) dans la région du point mort haut (17) de l'au moins une came (16) ou à une plus grande distance de l'axe de rotation (15) que le point mort haut (17) de l'au moins une came (16).
  4. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce qu'un poussoir (42), en particulier un poussoir à galet, est disposé entre la came (16) et le piston de pompe (20), lequel poussoir est guidé dans un logement (52) dans le carter de pompe (10) de manière coulissante dans la direction du mouvement de va-et-vient du piston de pompe (20), et en ce que le logement (52) est raccordé à l'espace (64).
  5. Pompe selon la revendication 4, caractérisée en ce que le logement (52) est réalisé sous forme d'alésage, et en ce que l'alésage (52) comprend, dans sa région d'extrémité tournée vers l'arbre d'entraînement (14), une rainure (70) entourant le poussoir (42), laquelle est raccordée à l'espace (64).
  6. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce que celle-ci comprend un premier élément de pompe (18a) et un deuxième élément de pompe (18b) décalé par rapport au premier élément de pompe (18a) d'approximativement 90°, vu dans le sens de rotation (13) de l'arbre d'entraînement (14), en ce que l'évacuation (68) de milieu dans l'espace (64) débouche dans la zone angulaire d'approximativement 90° entre le premier et le deuxième élément de pompe (18a, 18b), et en ce que l'amenée (66) de milieu dans l'espace (64) débouche dans la zone angulaire d'approximativement 270° entre le premier et le deuxième élément de pompe (18a, 18b).
  7. Pompe selon la revendication 6, caractérisée en ce que l'amenée (66) de milieu dans l'espace (64) débouche à une faible distance angulaire après le deuxième élément de pompe (18b), vu dans le sens de rotation (13) de l'arbre d'entraînement (14).
  8. Pompe selon la revendication 6 ou 7, caractérisée en ce que l'évacuation (68) de milieu dans l'espace (64) débouche au moins approximativement centralement dans la zone angulaire d'approximativement 90° entre le premier et le deuxième élément de pompe (18a, 18b).
  9. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce que du milieu sous pression est acheminé dans l'espace (64) par le biais de l'amenée (66).
  10. Pompe selon la revendication 9, caractérisée en ce que du milieu devant être refoulé par la pompe est acheminé dans l'espace (64) par le biais de l'amenée (66).
EP11794104.7A 2010-12-09 2011-12-05 Pompe, en particulier pompe à carburant haute pression Not-in-force EP2649313B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010062678A DE102010062678A1 (de) 2010-12-09 2010-12-09 Pumpe, insbesondere Kraftstoffhochdruckpumpe
PCT/EP2011/071784 WO2012076484A1 (fr) 2010-12-09 2011-12-05 Pompe, en particulier pompe à haute pression pour carburant

Publications (2)

Publication Number Publication Date
EP2649313A1 EP2649313A1 (fr) 2013-10-16
EP2649313B1 true EP2649313B1 (fr) 2014-09-17

Family

ID=45315765

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11794104.7A Not-in-force EP2649313B1 (fr) 2010-12-09 2011-12-05 Pompe, en particulier pompe à carburant haute pression

Country Status (5)

Country Link
EP (1) EP2649313B1 (fr)
JP (1) JP5739545B2 (fr)
CN (1) CN103249949B (fr)
DE (1) DE102010062678A1 (fr)
WO (1) WO2012076484A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2459596B1 (es) * 2012-11-07 2015-03-31 Bsh Electrodomésticos España, S.A. Dispositivo refrigerador doméstico que comprende un espacio para alojar productos que han de ser refrigerados y una pared posterior para introducir aire frío en el espacio
WO2015001571A2 (fr) * 2013-07-04 2015-01-08 Paul Maria Mécanisme de pompe à déplacement positif utilisé pour des pompes et des turbines à eau

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004004705A1 (de) 2004-01-30 2005-08-18 Robert Bosch Gmbh Hochdruckpumpe, insbesondere für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine
DE602005009966D1 (de) * 2005-12-28 2008-11-06 Sensile Pat Ag Mikropumpe
DE102006041673A1 (de) * 2006-02-20 2007-08-23 Robert Bosch Gmbh Hochdruckpumpe, insbesondere für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine
JP4816438B2 (ja) * 2006-12-20 2011-11-16 株式会社デンソー サプライポンプ
JP2008163829A (ja) * 2006-12-28 2008-07-17 Denso Corp 燃料噴射ポンプ
JP4872684B2 (ja) * 2007-01-29 2012-02-08 株式会社デンソー 燃料供給ポンプ
US8261718B2 (en) * 2007-11-01 2012-09-11 Caterpillar Inc. High pressure pump and method of reducing fluid mixing within same
DE102009003096A1 (de) * 2009-05-14 2010-11-18 Robert Bosch Gmbh Hochdruckpumpe

Also Published As

Publication number Publication date
CN103249949B (zh) 2016-03-02
JP5739545B2 (ja) 2015-06-24
WO2012076484A1 (fr) 2012-06-14
EP2649313A1 (fr) 2013-10-16
CN103249949A (zh) 2013-08-14
DE102010062678A1 (de) 2012-06-14
JP2013545029A (ja) 2013-12-19

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