EP1269021B1 - Pompe a pistons radiaux - Google Patents

Pompe a pistons radiaux Download PDF

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Publication number
EP1269021B1
EP1269021B1 EP00987099A EP00987099A EP1269021B1 EP 1269021 B1 EP1269021 B1 EP 1269021B1 EP 00987099 A EP00987099 A EP 00987099A EP 00987099 A EP00987099 A EP 00987099A EP 1269021 B1 EP1269021 B1 EP 1269021B1
Authority
EP
European Patent Office
Prior art keywords
suction valve
drive shaft
controlled
piston pump
radial piston
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.)
Expired - Lifetime
Application number
EP00987099A
Other languages
German (de)
English (en)
Other versions
EP1269021A1 (fr
Inventor
Andreas Scharfenberg
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 EP1269021A1 publication Critical patent/EP1269021A1/fr
Application granted granted Critical
Publication of EP1269021B1 publication Critical patent/EP1269021B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/102—Disc valves
    • F04B53/1022—Disc valves having means for guiding the closure member axially
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • 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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • 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
    • F04B1/0452—Distribution members, e.g. valves

Definitions

  • the invention relates to a radial piston pump for High-pressure fuel production in fuel injection systems of internal combustion engines, in particular in a common rail Injection system, with one rotatable in a pump housing mounted drive shaft which is eccentric and with several, in particular three, with respect to Drive shaft radially in a respective element bore arranged piston cooperates by turning the Drive shaft in the respective element bore in radial Direction are reciprocable and one each Cylinder space limit, via a suction valve with a Low pressure space communicates.
  • Common-rail injection systems promotes a High pressure pump with the aid of a feed pump the Fuel to be injected from a fuel tank in a central high-pressure fuel storage, as Common rail is called. Lead by the rail Fuel lines to the individual injectors, the Cylinders of the internal combustion engine are assigned. The Injectors are dependent on the Operating parameters of the internal combustion engine individually from the Engine electronics driven to fuel in the combustion chamber to inject the internal combustion engine.
  • a radial piston pump can be used as they are, for example, in the unpublished DE 198 48 035 is described.
  • a Radial piston pump forms a piston with the associated Cylinder space each have a pump element through which the pumped fuel is subjected to high pressure.
  • the Flow rate of the radial piston pump can with the help of a Metering unit to the respective needs of Internal combustion engine to be adjusted. Then in the Radial piston pump only as much fuel compressed as actually needed.
  • an on the suction side of the radial piston pump provided adjustable throttle can be used. As a result, that the individual cylinder chambers in operation at a low flow rate can not be completely filled.
  • a radial piston pump with the features of the preamble of claim 1 is made WO 99/02857 known.
  • the object of the invention is a radial piston pump to provide an equal promotion of each Guaranteed pump elements and inexpensive to produce is.
  • the task is with a radial piston pump for High-pressure fuel production in fuel injection systems of internal combustion engines, in particular in a common rail injection system, rotatable with one in a pump housing mounted drive shaft which is eccentric and with several, in particular three, with respect to Drive shaft radially in a respective element bore arranged piston cooperates by turning the Drive shaft in the respective element bore in radial Direction are reciprocable and one each Cylinder space limit, via a suction valve with a Low pressure space is connected, solved by that exactly one suction valve is controlled so that it is in Dependence on the angle of rotation of the drive shaft opens and closes.
  • a particular embodiment of the invention is characterized characterized in that the controlled suction valve a Valve body having, by a closing spring is applied, which is located on the associated piston supported.
  • the closing spring presses depending on the Position of the associated piston and thus the Drive shaft against the valve body of the suction valve. If the piston is in its top dead center is the Distance between the piston and the valve body at smallest. Consequently, that of the closing spring on the Valve body applied force greatest.
  • Another particular embodiment of the invention is characterized in that the controlled suction valve is e.g. via a magnet is so controllable that it is at the top Dead center of the associated piston opens and one certain rotation angle of the drive shaft later again closes. Due to the exact opening time of the Controlled suction valve is the equal promotion of Radial piston pump according to the invention improved.
  • Another particular embodiment of the invention is characterized in that the remaining suction valves so are designed to be independent of the rotation angle of the Open drive shaft at different opening pressures.
  • the remaining, uncontrolled suction valves open in Dependence on the prevailing pressure difference. Druch the different opening pressures ensures that Each suction valve opens at minimum delivery.
  • all pump elements promote fuel.
  • the opening times of each are Suction valves different. Thus, not everyone promotes Element the same amount of fuel. Nevertheless, in the Practice with the radial piston pump according to the invention good Results achieved.
  • the radial piston pump according to the invention comprises three Pump elements offset by 120 ° from each other in one Radial plane are arranged to the axis of a drive shaft.
  • the drive shaft is rotatable in a pump housing stored and with an eccentric shaft section fitted.
  • the eccentric shaft section of the Drive shaft cooperates with three pistons, the radial to the drive shaft in a respective element bore are arranged.
  • the pistons limit one each Cylinder space.
  • Through a suction valve fuel enters the Cylinder space and is there by the piston with high pressure applied.
  • the high pressure fuel passes through a pressure valve in one High-pressure fuel storage (Rail).
  • the radial piston pump according to the invention thus comprises three Suction valves and three pressure valves.
  • a first Embodiment of the invention will be two conventional, spring-loaded suction valves together with a used rotary angle controlled suction valve whose Closing spring is supported against the associated piston.
  • rotationally controlled means that the Suction valve depending on the angle of rotation of the drive shaft is controlled.
  • the control of the suction valve is done by the closing spring, which depends on the position of the associated piston a more or less large force exerts the suction valve.
  • Such a suction valve is, for example. in the non-prepublished (DE 198 48 035) described.
  • the piston strokes H of the three pump elements 1, 2 and 3 are plotted over time as a function of the position of the associated suction valves S 1 , S 2 and S 3 .
  • the suction valve S 2 is rotational angle controlled.
  • the suction valve S 2 opens.
  • the closing spring which is supported on the piston is compressed, whereby the suction valve S 2 closes.
  • the low-pressure chamber which is formed in conventional radial piston pumps by an annular channel, there is still inlet pressure. The inlet pressure ensures that the uncontrolled suction valve S 3 opens.
  • the opening pressure at the suction valve S 3 may not be set higher than in the suction valve S 1 .
  • the suction valve S 3 remains open until the pump element 3 is filled so far that the higher opening pressure of the suction valve S 1 is reached. Then the uncontrolled suction valve S 1 opens until the controlled suction valve S 2 is opened again.
  • FIG. 2 shows an embodiment of the invention with two conventional suction valves S 1 , S 3 and a separately controlled suction valve S 2 is shown.
  • the suction valve S 2 is controlled so that it opens at top dead center TDC of the pump element 2 and closes at a low flow rate 120 ° rotation angle of the drive shaft later again.
  • By the adjacent inlet pressure then opens the suction valve S 1 , whose opening pressure is set lower than that of the suction valve S 3rd In the pump element 1 which thereby fills the piston pushes the fuel due to its stroke movement against the suction valve S 1 , which is thereby closed.
  • the suction valve S 3 is then opened, and that until the piston in the pump element 1 has left the top dead center, whereby the suction valve S 1 opens again because of its lower opening pressure.
  • the suction valve S 1 remains open until the controlled suction valve S 2 opens again.
  • the inventive combination of the separately controlled suction valve S 2 with the uncontrolled suction valves S 1 and S 3 ensures that all three pump elements 1 to 3 are securely filled with fuel.
  • the controlled opening duration of the suction valve S 2 of 120 ° rotation angle is to be expected with a better equal promotion than in the embodiment shown in Figure 1.
  • the control for the separate suction valve S 2 is integrated into the radial piston pump.
  • the invention generally provides the advantage that the Opening pressure of the uncontrolled suction valves are lowered can. As a result, the starting conditions for the prefeed pump in a common rail injection system defused. In addition, the efficiency compared to a Radial piston pump with three controlled suction valves increased become.

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)
  • Details Of Reciprocating Pumps (AREA)

Claims (4)

  1. Pompe à pistons radiaux permettant de générer une haute pression de carburant dans des systèmes d'injection de carburant de moteurs à combustion interne, notamment dans un système d'injection à rampe commune (Common Rail), comprenant un arbre d'entraínement monté en rotation dans un boítier de pompe, arbre formé de manière excentrique et coopérant avec plusieurs pistons, notamment trois pistons disposés radialement par rapport à l'arbre d'entraínement dans l'alésage d'un élément respectif, ces pistons pouvant être déplacés dans un mouvement de va-et-vient en direction radiale dans l'alésage de l'élément respectif lors de la rotation de l'arbre d'entraínement et limitant à chaque fois une chambre de cylindre reliée à une chambre basse-pression par une soupape d'aspiration (S1, S2, S3),
    caractérisée en ce que
    seule une soupape d'aspiration (S2) est commandée de telle sorte qu'elle s'ouvre et se ferme en fonction de l'angle de rotation de l'arbre d'entraínement.
  2. Pompe à pistons radiaux selon la revendication 1,
    caractérisée en ce que
    la soupape d'aspiration commandée (S2) présente un corps de soupape sollicité par un ressort de fermeture qui s'appuie contre le piston correspondant.
  3. Pompe à pistons radiaux selon la revendication 1,
    caractérisée en ce que
    la soupape d'aspiration commandée (S2) peut être commandée par un aimant, de telle sorte qu'elle s'ouvre lorsque le piston correspondant est au point mort supérieur et se referme ensuite suivant un certain angle de rotation de l'arbre d'entraínement.
  4. Pompe à pistons radiaux selon l'une des revendications précédentes,
    caractérisée en ce que
    les autres soupapes d'aspiration (S1, S3) sont montées de telle sorte qu'elles s'ouvrent indépendamment de l'angle de rotation de l'arbre d'entraínement sous des pressions d'ouverture différentes.
EP00987099A 1999-12-08 2000-11-09 Pompe a pistons radiaux Expired - Lifetime EP1269021B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19959006A DE19959006C1 (de) 1999-12-08 1999-12-08 Radialkolbenpumpe
DE19959006 1999-12-08
PCT/DE2000/003914 WO2001042651A1 (fr) 1999-12-08 2000-11-09 Pompe a pistons radiaux

Publications (2)

Publication Number Publication Date
EP1269021A1 EP1269021A1 (fr) 2003-01-02
EP1269021B1 true EP1269021B1 (fr) 2005-11-16

Family

ID=7931747

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00987099A Expired - Lifetime EP1269021B1 (fr) 1999-12-08 2000-11-09 Pompe a pistons radiaux

Country Status (5)

Country Link
US (1) US6843641B1 (fr)
EP (1) EP1269021B1 (fr)
JP (1) JP4787444B2 (fr)
DE (2) DE19959006C1 (fr)
WO (1) WO2001042651A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006017036A1 (de) * 2006-04-11 2007-10-18 Siemens Ag Radialkolbenpumpe zur Kraftstoff-Hochdruckversorgung bei einer Brennkraftmaschine
US7444989B2 (en) * 2006-11-27 2008-11-04 Caterpillar Inc. Opposed pumping load high pressure common rail fuel pump
US7690353B2 (en) * 2007-11-30 2010-04-06 Caterpillar Inc. Synchronizing common rail pumping events with engine operation
DE102008036416B4 (de) * 2008-08-05 2013-12-05 Continental Automotive Gmbh Pumpe und Verfahren zur Förderung eines Fluids
DE102009057927B4 (de) * 2009-12-11 2016-05-19 Continental Automotive Gmbh Pumpe und Verfahren zur Förderung eines Fluids

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2336526A (en) * 1941-07-02 1943-12-14 Nat Tube Co Means for controlling the operation of pumps and the like
JPS506043B1 (fr) * 1969-05-19 1975-03-10
DE3243348A1 (de) * 1982-11-24 1984-05-24 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe
JPH07122422B2 (ja) 1986-05-02 1995-12-25 日本電装株式会社 燃料噴射装置
WO1990002876A1 (fr) * 1988-09-15 1990-03-22 Zahnradfabrik Friedrichshafen Ag Pompe a piston radiaux
US5167493A (en) * 1990-11-22 1992-12-01 Nissan Motor Co., Ltd. Positive-displacement type pump system
ATE169720T1 (de) 1993-11-08 1998-08-15 Sig Schweiz Industrieges Steuereinrichtung für eine füllgrad-verstellpumpe
JP3310871B2 (ja) 1996-07-08 2002-08-05 三菱電機株式会社 燃料噴射装置
DE19709586A1 (de) * 1997-03-08 1998-09-10 Itt Mfg Enterprises Inc Hydraulische Pumpe mit weggsteuertem Saugventil
DE19814505A1 (de) * 1997-07-11 1999-01-21 Bosch Gmbh Robert Radialkolbenpumpe zur Kraftstoffhochdruckerzeugung
WO1999002857A2 (fr) * 1997-07-11 1999-01-21 Robert Bosch Gmbh Pompe a piston radial pour alimentation haute pression en carburant
DE19848035A1 (de) * 1998-10-17 2000-04-20 Bosch Gmbh Robert Radialkolbenpumpe für Kraftstoffhochdruckerzeugung

Also Published As

Publication number Publication date
JP4787444B2 (ja) 2011-10-05
WO2001042651A1 (fr) 2001-06-14
US6843641B1 (en) 2005-01-18
DE50011662D1 (de) 2005-12-22
JP2003516498A (ja) 2003-05-13
DE19959006C1 (de) 2000-12-21
EP1269021A1 (fr) 2003-01-02

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