EP2167818B1 - Pompe haute pression avec poussoir à galet pour carburant - Google Patents

Pompe haute pression avec poussoir à galet pour carburant Download PDF

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Publication number
EP2167818B1
EP2167818B1 EP08774082A EP08774082A EP2167818B1 EP 2167818 B1 EP2167818 B1 EP 2167818B1 EP 08774082 A EP08774082 A EP 08774082A EP 08774082 A EP08774082 A EP 08774082A EP 2167818 B1 EP2167818 B1 EP 2167818B1
Authority
EP
European Patent Office
Prior art keywords
tappet
drive shaft
radial piston
piston pump
bore
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
EP08774082A
Other languages
German (de)
English (en)
Other versions
EP2167818A1 (fr
Inventor
Eberhard Maier
Bernd Haeusser
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 EP2167818A1 publication Critical patent/EP2167818A1/fr
Application granted granted Critical
Publication of EP2167818B1 publication Critical patent/EP2167818B1/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
    • F04B1/043—Hydraulic arrangements
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
    • 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
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/042—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being cams

Definitions

  • the invention relates to a radial piston pump for high-pressure fuel generation according to the preamble of claim 1.
  • Such a radial piston pump is through EP-A-0 972 936 known.
  • This radial piston pump has a drive shaft mounted in a pump housing.
  • the radial piston pump also has at least one with respect to the drive shaft radially in each case an element bore arranged piston, wherein the at least one piston is movable by rotating the drive shaft in the element bore in the radial direction back and forth.
  • a plunger is arranged and guided in the pump housing of the plunger and the pump housing in each case a plunger space is limited, wherein the plunger space is hydraulically in communication with an engine room.
  • An indentation for receiving a roller is provided on an end of the tappet facing the drive shaft, with at least part of the hydraulic connections between the tappet space and the engine compartment opening into the recess.
  • a radial piston pump which has a drive shaft mounted in a pump housing.
  • the radial piston pump also has at least one with respect to the drive shaft radially in each case an element bore arranged piston, wherein the at least one piston is movable by rotating the drive shaft in the element bore in the radial direction back and forth.
  • a plunger is arranged and guided in the pump housing of the plunger and the pump housing in each case a plunger space is limited, wherein the plunger space is hydraulically in communication with an engine room.
  • An indentation for receiving a roller is provided on an end of the tappet facing the drive shaft, with at least part of the hydraulic connections between the tappet space and the engine compartment opening into the recess. Also in this radial piston pump lubrication of the roller is achieved by the hydraulic connections, which may still be insufficient under certain circumstances.
  • the radial piston pump according to the invention with the features according to claim 1 has the advantage that the subsidized by the plunger fuel directly to the tribologically most krestensten points, namely the contact zones between Guide body and roller, is supplied. In addition, in this way particles which have developed due to wear between the plunger body and the roller can best be conveyed away from this contact zone.
  • the plunger has at least one groove, but preferably a groove at both ends of the recess, wherein the groove extends substantially in the axial direction of the plunger.
  • At least one connecting bore is provided in the pump housing, and that the at least one Connecting bore two ram spaces hydraulic interconnects.
  • the amount of fuel delivered by the hydraulic fuel of the invention can be limited to the necessary extent, so that the pumping work of the plunger is reduced to the necessary level.
  • two plunger chambers can be hydraulically connected by an external connection line. This variant is recommended if, for structural or other reasons, a connection bore in the pump housing can not be accommodated.
  • the function of the radial piston pump according to the invention can be further improved if the already existing supply of the drive shaft with fuel for cooling and lubrication opens into the hydraulic connection between two plunger chambers, since in this case a defined amount of lubricant for lubrication and cooling purposes the plungers and the Tappet spaces can be supplied. Thereby increases the load capacity of the radial piston pump according to the invention, without additional manufacturing or manufacturing costs.
  • the drive shaft may be formed as a camshaft or as an eccentric shaft. It is also possible to provide the plungers with a roller which roll on the camshaft so that the frictional forces between the plunger and the camshaft are reduced.
  • FIG. 1 schematically shows a radial piston pump for high-pressure fuel supply in fuel injection systems, in particular common rail fuel injection systems, of internal combustion engines in section.
  • radial piston pump is equipped with an integrated demand quantity control.
  • the flow rate control is carried out on the low pressure side via a metering unit ZME.
  • radial piston pump comprises a mounted in a pump housing 1 drive shaft 2 with two offset by 180 ° seconded cam 36. Against the cam 36, two pistons 8 are supported. The pistons 8 are each received in an element bore 11 in the radial direction movable back and forth. The pistons 8 are arranged at an angle of about 90 ° to each other and limit at its end remote from the drive shaft 2 a delivery chamber (not shown).
  • a plate 14 is provided on the piston 8. These plates 14 may be either integral with the piston 8 or removably attached thereto.
  • a spring 17 is biased. The springs 17 press the pistons 8 against the bottoms 20 of the plungers 23.
  • From the bottoms 20 of the plungers 23 extends a cylindrical guide body 26 in the direction of the delivery chambers, not shown. The guide body 26 are part of the plunger 23 and prevent tilting of the plunger 23 in a guide bore 29.
  • the plunger 23 are slidable in the pump housing 1.
  • a semicircular recess 27 is provided which serves to support a roller 28.
  • the recess 27 and the roller 28 form a sliding bearing, while the roller 28 rolls on the cam 36 of the drive shaft 2.
  • the roller 28 i, guide body 26 is fixed. In this case, a relative movement between the end faces of the roller 28 and the guide body 26 takes place, which can cause wear.
  • radial piston pump serves to pressurize fuel that is supplied from a Vor fundamentalpumpe from a tank with high pressure.
  • the pistons 8 are moved away from the axis of rotation of the drive shaft camshaft 2 as a result of the eccentric movement of the cams 36 of the drive shaft 2.
  • the pistons 8 move radially toward the axis of the camshaft 2 in order to suck fuel into the delivery chamber (not shown).
  • FIG. 2 a is the plunger 23 in longitudinal section and in FIG. 2 b) shown in a side view. From the longitudinal section ( Fig. 2a ) can be clearly seen that in the illustrated embodiment, the bottom 20 is inserted into the guide body 26 becomes. To make a positive connection between the bottom 20 and guide body 26, a Seeger ring 30 may be provided.
  • the roller 28 is rounded at its end faces and is fixed in the lateral direction by the guide body 26. Due to the oscillating movement of the plunger 23 in the guide bore 29, the end faces of the roller 28 rotate on the inside of the guide body 26.
  • a hydraulic connection between the plunger chambers 32, 33 on the one hand and the recess 28 is provided according to the invention . Furthermore, the hydraulic connection according to the invention improves the tribological relationships between roller 28 and plunger 23.
  • FIG. 2a Two variants of inventive hydraulic connections are shown. On the right side of FIG. 2a ), a groove 53 is shown, which supplies the contact point between the roller 28 and the guide body 26 with fuel. At the left side of FIG. 2a ) an alternative embodiment of the hydraulic connection according to the invention in the form of a bore 55 is shown, which supplies the contact point between the roller 28 and the guide body 26 with fuel. In general, you will make both sides of a plunger 23 the same.
  • the groove 53 and the bore 55 are alternative embodiments of the invention. Which of these alternatives is given preference in the individual case depends on the circumstances of the individual case.
  • the plunger 23 when the plunger 23 is driven by the cam 36 of the drive shaft, it performs an oscillating motion in FIG. 2a indicated by a double arrow, from. Since there is fuel in both the plunger chambers 32, 33 and in the engine compartment 35, the oscillating movement of the plunger 23 causes fuel to be delivered from the engine compartment 35 into the plunger chambers 32 and 33 when the piston engages FIG. 2a moved from top to bottom. As soon as the plunger 23 moves from the bottom to the top, the flow direction is reversed and fuel from the plunger chambers 32, 33 is conveyed into the engine compartment 35.
  • the volume changes in the plunger chambers 32 and 33 are phase-shifted by 90 °.
  • This phase shift can be exploited by providing a communication bore 37 between the plunger spaces 32 and 33 such that whenever the volume of a plunger space decreases, the fuel in that plunger space is partially ejected into the adjacent plunger space whose volume is the same Time is increasing. The other part of the fuel flows through the groove 53 or the bore 55 and the compensation bores 41 (if present) in the bottom 20 of the plungers 23 and 24.
  • the lubrication of the camshaft 2 and its storage takes place via a lubricant supply 38 with a throttle 39, which directly with fuel from the fuel tank, not shown Internal combustion engine is fed via a supply line 40. From the supply line 40 branches off a line 43 which supplies the metering unit ZME of the radial piston pump with fuel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)

Claims (8)

  1. Pompe à pistons radiaux pour la génération de carburant haute pression dans des systèmes d'injection de carburant de moteurs à combustion interne, notamment dans un système d'injection à rampe commune, comprenant un arbre d'entraînement (2) monté dans un boîtier de pompe (1), au moins un piston (8) disposé par rapport à l'arbre d'entraînement radialement dans un alésage d'élément respectif (11), l'au moins un piston (8) pouvant être déplacé dans la direction radiale d'avant en arrière par rotation de l'arbre d'entraînement (2) dans l'alésage d'élément (11), un poussoir (23) disposé entre le piston (8) et l'arbre d'entraînement (2) et guidé dans le boîtier de pompe (1), avec un espace de poussoir (32, 33) limité à chaque fois par le poussoir (23) et le boîtier de pompe (1), l'espace de poussoir (32, 33) étant en liaison hydraulique avec un espace moteur (35), un renfoncement (27) pour recevoir un galet (28) étant prévu à une extrémité du poussoir (23) tournée vers l'arbre d'entraînement (2), au moins une partie des connexions hydrauliques entre l'espace de poussoir (32, 33) et l'espace moteur (35) débouchant dans le renfoncement (27), caractérisée en ce que la connexion hydraulique (53, 55) débouche aux extrémités du renfoncement (27) dans ce dernier.
  2. Pompe à pistons radiaux selon la revendication 1, caractérisée en ce que le poussoir (23) présente au moins une rainure (53) et en ce que la rainure (53) s'étend essentiellement dans la direction axiale du poussoir (23).
  3. Pompe à pistons radiaux selon la revendication 1, caractérisée en ce que le poussoir (23) présente au moins un alésage (55) et en ce que l'alésage (55) s'étend essentiellement dans la direction axiale du poussoir (23).
  4. Pompe à pistons radiaux selon l'une quelconque des revendications précédentes, caractérisée en ce que le renfoncement (27) est réalisé dans un fond (20) du poussoir (23).
  5. Pompe à pistons radiaux selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins un alésage de connexion (37) est prévu dans le boîtier de pompe (1) et en ce que l'au moins un alésage de connexion (37) relie hydrauliquement deux espaces de poussoir (32, 33).
  6. Pompe à pistons radiaux selon l'une quelconque des revendications précédentes, caractérisée en ce qu'une alimentation en lubrifiant (38) débouche dans la connexion hydraulique (37) entre deux espaces de poussoir (32, 33).
  7. Pompe à pistons radiaux selon l'une quelconque des revendications précédentes, caractérisée en ce que les poussoirs (23) présentent des alésages de compensation supplémentaires (41) ou des rainures de compensation.
  8. Pompe à pistons radiaux selon l'une quelconque des revendications précédentes, caractérisée en ce que l'arbre d'entraînement (2) est réalisé sous forme d'arbre à came.
EP08774082A 2007-07-20 2008-06-13 Pompe haute pression avec poussoir à galet pour carburant Not-in-force EP2167818B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007034036A DE102007034036A1 (de) 2007-07-20 2007-07-20 Kraftstoffhochdruckpumpe mit Rollenstößel
PCT/EP2008/057457 WO2009013068A1 (fr) 2007-07-20 2008-06-13 Pompe haute pression avec poussoir à galet pour carburant

Publications (2)

Publication Number Publication Date
EP2167818A1 EP2167818A1 (fr) 2010-03-31
EP2167818B1 true EP2167818B1 (fr) 2011-01-26

Family

ID=39777041

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08774082A Not-in-force EP2167818B1 (fr) 2007-07-20 2008-06-13 Pompe haute pression avec poussoir à galet pour carburant

Country Status (6)

Country Link
US (1) US20100170480A1 (fr)
EP (1) EP2167818B1 (fr)
JP (1) JP2010533818A (fr)
AT (1) ATE497106T1 (fr)
DE (2) DE102007034036A1 (fr)
WO (1) WO2009013068A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011003678A1 (de) * 2011-02-07 2012-08-09 Robert Bosch Gmbh Hochdruckpumpe
DE102011084486A1 (de) 2011-10-14 2013-04-18 Robert Bosch Gmbh Stößelbaugruppe für eine Hochdruckpumpe
JP2013155682A (ja) * 2012-01-31 2013-08-15 Denso Corp 燃料供給ポンプおよび燃料供給装置
KR101349642B1 (ko) * 2012-04-19 2014-01-10 (주)모토닉 내연기관의 고압펌프
KR20140019539A (ko) * 2012-08-06 2014-02-17 현대자동차주식회사 고압펌프용 롤러 구조
KR101371897B1 (ko) 2012-09-05 2014-03-07 현대자동차주식회사 윤활성능이 개선된 고압연료펌프
KR20140037707A (ko) * 2012-09-19 2014-03-27 현대자동차주식회사 고압연료펌프
CN102979732B (zh) * 2012-10-30 2015-10-28 无锡鸿声铝业有限公司 真空旋转密封泵滚珠摩擦进油结构
DE102012223413A1 (de) * 2012-12-17 2014-06-18 Robert Bosch Gmbh Rollenstößel für eine Pumpe, insbesondere Kraftstoffhochdruckpumpe, und Pumpe mit Rollenstößel
GB201520698D0 (en) * 2015-11-24 2016-01-06 Delphi Internat Operations Luxembourg S À R L Fuel Pump
US10975816B2 (en) * 2017-11-27 2021-04-13 Stanadyne Llc Roller drive mechanism for GDI pump

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DE3724409A1 (de) * 1986-10-31 1988-05-19 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
EP0301222B1 (fr) * 1987-07-25 1992-05-06 Robert Bosch Gmbh Pompe d'injection de combustible pour moteurs à combustion interne
US5058553A (en) * 1988-11-24 1991-10-22 Nippondenso Co., Ltd. Variable-discharge high pressure pump
JPH0571441A (ja) * 1991-09-11 1993-03-23 Nippondenso Co Ltd 燃料噴射装置
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ATE178973T1 (de) 1993-05-06 1999-04-15 Cummins Engine Co Inc Kompakte kraftstoffanlage hoher leistung mit speicher
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Also Published As

Publication number Publication date
JP2010533818A (ja) 2010-10-28
WO2009013068A1 (fr) 2009-01-29
US20100170480A1 (en) 2010-07-08
DE102007034036A1 (de) 2009-01-22
DE502008002488D1 (de) 2011-03-10
ATE497106T1 (de) 2011-02-15
EP2167818A1 (fr) 2010-03-31

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