EP0970309B2 - Pompe a pistons radiaux pour alimentation en carburant sous haute pression - Google Patents

Pompe a pistons radiaux pour alimentation en carburant sous haute pression Download PDF

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Publication number
EP0970309B2
EP0970309B2 EP98963344A EP98963344A EP0970309B2 EP 0970309 B2 EP0970309 B2 EP 0970309B2 EP 98963344 A EP98963344 A EP 98963344A EP 98963344 A EP98963344 A EP 98963344A EP 0970309 B2 EP0970309 B2 EP 0970309B2
Authority
EP
European Patent Office
Prior art keywords
drive shaft
piston pump
radial piston
bucket
tappet
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
EP98963344A
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German (de)
English (en)
Other versions
EP0970309A1 (fr
EP0970309B1 (fr
Inventor
Bernd Streicher
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7850594&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0970309(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0970309A1 publication Critical patent/EP0970309A1/fr
Application granted granted Critical
Publication of EP0970309B1 publication Critical patent/EP0970309B1/fr
Publication of EP0970309B2 publication Critical patent/EP0970309B2/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
    • 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
    • F04B1/0439—Supporting or guiding means for the pistons
    • 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
    • F04B1/0421—Cylinders

Definitions

  • the invention relates to a radial piston pump for high-pressure fuel supply in fuel injection systems of internal combustion engines, in particular in a common rail injection system, with a mounted in a pump housing drive shaft which is eccentric or has cam-like elevations in the circumferential direction, and preferably with a plurality of relative to the drive shaft radially in one respective cylinder chamber arranged pistons, which are movable by rotating the drive shaft in the respective cylinder chamber in the radial direction back and forth.
  • the present invention can be used not only in a radial piston pump, but also in high-pressure pumps, in particular with a demand flow control.
  • the invention is therefore based on the problem to provide a radial piston pump, which avoids these disadvantages and has a further improved efficiency and a further increased load capacity with low production costs.
  • damage to the piston base, such as cage breaks are to be prevented, so that a perfect operation of the radial piston pump is guaranteed even with partial filling.
  • the radial piston pump according to the invention should withstand a pump pressure of up to 2000 bar.
  • the openings according to the invention serve to equalize the pressure and ensure that even when the full stroke is used, only a minimal pressure difference results between the space surrounding the drive shaft and the respective cylinder space.
  • the increase in the Hertzian pressure in Nutzhub remains low and in the intake stroke a full filling of the element is guaranteed.
  • peak pressures up to 2000 bar a long service life of the piston is guaranteed.
  • the force receiving plate is in contact with the drive shaft and may have a different thickness depending on the load.
  • the surface of the force plate may be specially treated to ensure high wear resistance.
  • the guide ring ensures that the transverse force receiving device does not tilt in the cylinder chamber.
  • the dimensions of the guide ring depend on the pump pressure and the number of load changes per unit time.
  • a particular embodiment of the invention is characterized in that the bucket tappet is movable in the same direction as the associated piston back and forth. This ensures that forces from the drive shaft in the radial direction, i. in the longitudinal direction of the piston, can be discharged through the tappets on the piston. Thus, the required for the operation of the pump reciprocating the piston of the radial piston pump is guaranteed.
  • Another particular embodiment of the invention is characterized in that the bucket tappet is guided in each case in a bore in the housing, which extends in the same direction as the associated cylinder chamber.
  • the guide allows even at high pump pressures and rapid load changes a reciprocating motion of the transverse force receiving device. In particular, tilting of the tappet in the cylinder space is avoided.
  • Another particular embodiment of the invention is characterized in that the pistons are each pressed by a spring against the associated force receiving plate of the tappet. By the spring force of the piston is moved to the drive shaft, so that fuel is sucked. It is also possible that the force-receiving plate of the bucket tappet is pressed by a spring against the drive shaft. However, in this case, it would be necessary for the force-receiving plate to be connected to the piston in order to ensure the suction of fuel. If the piston is acted upon directly by the spring force, this connection between the force plate and piston can be omitted.
  • This variant has the advantage that a so executed radial piston pump can be easily and inexpensively manufactured. In addition, in this variant, the application of the present invention to known radial piston pumps readily possible.
  • Another particular embodiment of the invention is characterized in that the force-receiving plate is slightly convex formed on the side facing the drive shaft.
  • the convexity of the force-absorbing plate serves to reduce the contact area between the drive shaft and the force-receiving plate. As a result, the torque applied by the drive shaft to the tappet is advantageously reduced.
  • the elastic deformation of the tappet must be taken into account.
  • a ring is arranged between the drive shaft and the bucket tappets.
  • the ring serves to transmit the forces from the drive shaft to the force-receiving plate.
  • the ring is slidably mounted on the drive shaft.
  • the ring may be formed either cylindrical or polygonal.
  • the present invention has the general advantage that it can be realized easily and inexpensively.
  • the basic idea of the present invention can be easily applied to existing radial piston pumps by e.g. a plunger plate provided on the piston is replaced by a cup tappet.
  • the component strength is increased, especially at a zero promotion in the intake stroke.
  • FIGS. 1 and 2 show a radial piston pump for high-pressure fuel supply in fuel injection systems of internal combustion engines.
  • the radial piston pump is equipped with an integrated demand quantity control.
  • the radial piston pump according to the invention is used in particular in common-rail injection systems for supplying fuel to diesel engines.
  • “Common rail” means “joint management” or “common rail”.
  • the injection nozzles in common-rail injection systems are fed from a common line.
  • the in the FIGS. 1 and 2 shown radial piston pump comprises a mounted in a pump housing 2 drive shaft 4 with an eccentrically shaped shaft portion 6.
  • a ring 8 is provided, against which the shaft portion 6 is rotatable.
  • the ring 8 comprises three each offset by 120 ° to each other flattened portions 10 against each of which a piston 12 is supported.
  • the pistons 12 are each received in a cylinder chamber 18 to the drive shaft 4 in the radial direction back and forth.
  • a spring plate 13 is secured, against which a spring 14 is prestressed.
  • the spring 14 presses the piston 12 against a force-receiving plate 15, which belongs to a tappet 9, enlarged in scale 2: 1 in the FIGS. 3 and 4 is shown.
  • the force receiving plate 15 has the shape of a round disc on the circumference of four rectangular recesses 16 are evenly distributed.
  • the force-receiving plate 15 is connected by a cup-shaped body 17 with a guide ring 19.
  • the openings 16 extend each of the force receiving plate 15 in the cup-shaped body 17.
  • the size of the openings 16 is selected so that when reciprocating the bucket tappet 9, a pressure equalization takes place between the space in which the ring 8 is arranged, and the space in the spring 14 is arranged. Ensure the openings 16. that the pressure difference between the aforementioned spaces is minimal in all operating conditions.
  • FIG. 1 It is shown that the force receiving plates 15 are in abutment with the flats 10 of the ring 8.
  • the ring 8 is slidably mounted on the drive shaft 4 and is set in rotation of the drive shaft 4 by the eccentrically shaped shaft portion 6 in motion.
  • this movement not only has a radial component required with respect to the drive shaft 4, which is required for the piston stroke, but also a component in the circumferential direction of the drive shaft 4, ie transversely to the piston 12. This component, which corresponds to the transverse forces mentioned above, is undesirable because it causes a moment on the pistons.
  • the bucket tappet according to the invention absorbs the forces in the circumferential direction of the ring 8.
  • the tappet 9 is, as in the FIGS. 1 and 2 is shown guided by the guide ring 19 in a bore 24 in the housing 2.
  • the bore extends in each case in the same direction as the associated cylinder chamber 18.
  • the main difference between the embodiment of the Figures 5 and 6 compared to the embodiment of the FIGS. 1 and 2 is that the ring 8 at the in the Figures 5 and 6 shown radial piston pump does not have the shape of a polygon, but is cylindrical.
  • the tappet 9 is the same in both embodiments and corresponds to the tappet 9, which increases in the FIGS. 3 and 4 is shown.

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)

Claims (6)

  1. Pompe à pistons radiaux pour l'alimentation en carburant à haute pression dans un système d'alimentation en carburant d'un moteur à combustion interne notamment d'un système d'injection à rampes communes comprenant un arbre d'entraînement (4) monté dans un boîtier de pompe (2), cet arbre étant excentrique ou comportant dans la direction périphérique des bossages en forme de cames ainsi que plusieurs pistons (12) disposés radialement par rapport à l'arbre d'entraînement (4) dans une chambre cylindrique (18) respective, ces pistons (12) sont entraînés en mouvements alternatifs dans la direction radiale dans chaque chambre cylindrique (18) par la rotation de l'arbre d'entraînement (4), on a chaque fois un poussoir en forme the coupelle avec un corps (17) en forme de coupelle et le fond du poussoir en forme de coupelle (9) est formé par une plaque de réception de forces (15), caracterisée en ce que le corps (17) en forme de coupelle comporte plusieurs ouvertures (16) et en ce que la plaque de réception de forces (15) est reliée à une bague de guidage (19) par le corps en forme de coupelle.
  2. Pompe à pistons radiaux selon la revendication 1, caracterisée en ce que le poussoir en forme de coupelle (9) est mobile selon un mouvement de va-et-vient dans la même direction que le piston (12) correspondant.
  3. Pompe à pistons radiaux selon la revendication 2, caracterisée en ce que le poussoir en forme de coupelle (9) est guidé chaque fois dans un perçage (24) du boîtier (2) s'étendant dans la même direction que la chambre cylindrique (18) correspondante.
  4. Pompe à pistons radiaux selon la revendication 1, caracterisée en ce que les pistons (12) sont poussés par un ressort (14) contre la plaque de réception de forces (15) correspondate du poussoir en forme de coupelle (9).
  5. Pompe à pistons radiaux selon la revendication 4, caracterisée en ce que la plaque de réception de forces (15) a un côté de forme légèrement bombée tourné vers l'arbre d'entraînement (4).
  6. Pompe à pistons radiaux selon l'une des revendications précédentes, caracterisée par un anneau (8) prévu entre l'arbre d'entraînement (4) et les poussoirs en forme de coupelle (9).
EP98963344A 1997-12-03 1998-11-12 Pompe a pistons radiaux pour alimentation en carburant sous haute pression Expired - Lifetime EP0970309B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19753593 1997-12-03
DE19753593A DE19753593A1 (de) 1997-12-03 1997-12-03 Radialkolbenpumpe zur Kraftstoffhochdruckversorgung
PCT/DE1998/003321 WO1999028625A1 (fr) 1997-12-03 1998-11-12 Pompe a pistons radiaux pour alimentation en carburant sous haute pression

Publications (3)

Publication Number Publication Date
EP0970309A1 EP0970309A1 (fr) 2000-01-12
EP0970309B1 EP0970309B1 (fr) 2003-09-03
EP0970309B2 true EP0970309B2 (fr) 2009-04-22

Family

ID=7850594

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98963344A Expired - Lifetime EP0970309B2 (fr) 1997-12-03 1998-11-12 Pompe a pistons radiaux pour alimentation en carburant sous haute pression

Country Status (5)

Country Link
US (1) US6250893B1 (fr)
EP (1) EP0970309B2 (fr)
JP (1) JP4308921B2 (fr)
DE (2) DE19753593A1 (fr)
WO (1) WO1999028625A1 (fr)

Families Citing this family (18)

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Publication number Priority date Publication date Assignee Title
DE19844326B4 (de) * 1998-09-28 2006-01-05 Robert Bosch Gmbh Radialkolbenpumpe
DE19956092A1 (de) * 1999-11-22 2000-10-26 Siemens Ag Kolbenpumpe, insbesondere Hochdruck-Radialkolbenpumpe
DE10147981A1 (de) * 2001-09-28 2003-04-24 Siemens Ag Verbindungselement zur Verbindung eines Kolbens mit einem Rückstellelement
DE10200792A1 (de) * 2002-01-11 2003-07-31 Bosch Gmbh Robert Kraftstoffpumpe für eine Brennkraftmaschine
KR100539209B1 (ko) * 2002-08-29 2005-12-27 주식회사 두원정공 고압 서플라이 펌프
CN100392241C (zh) * 2003-02-11 2008-06-04 甘瑟-许德罗玛格股份公司 高压泵
GB0311814D0 (en) * 2003-05-22 2003-06-25 Delphi Tech Inc Pump assembly
DE10347715A1 (de) * 2003-10-14 2005-05-12 Zahnradfabrik Friedrichshafen Radialkolbenpumpe
DE102004023541A1 (de) * 2004-05-13 2005-12-01 Robert Bosch Gmbh Hochdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine
SE531362C2 (sv) * 2005-06-20 2009-03-10 Oehlins Racing Ab Pumpanordning för bl a fram- och bakhjulsdriven motorcykel
WO2007071661A1 (fr) * 2005-12-20 2007-06-28 Industriehansa Consulting & Engineering Gmbh Pompe haute pression comprenant plusieurs pistons par cylindre
DE102007019261A1 (de) 2007-04-17 2008-10-23 Golle Motor Ag Radialkolbenpumpe, insbes. für Common Rail (CR)-Einspritzsysteme
ES2542856T3 (es) 2007-10-12 2015-08-12 Delphi International Operations Luxembourg S.À R.L. Mejoras relacionadas con bombas de combustible
DE102008000954A1 (de) 2008-04-03 2009-10-08 Robert Bosch Gmbh Hochdruckkraftstoffpumpe mit optimierter Schmierung
DE102008001869A1 (de) 2008-05-20 2009-11-26 Robert Bosch Gmbh Radialkolbenpumpe
WO2013030873A1 (fr) * 2011-08-30 2013-03-07 Mitsubishi Heavy Industries, Ltd. Générateur à turbine à énergie renouvelable comportant une pompe hydraulique qui présente un couvercle segmenté, et procédé pour assembler la pompe
GB201503556D0 (en) * 2015-03-03 2015-04-15 Delphi International Operations Luxembourg S.�.R.L. High temperature fuel deflector for a fuel pump drive assembly
CN108915919B (zh) * 2018-08-28 2023-10-20 河南柴油机重工有限责任公司 一种高压共轨柴油机共轨泵驱动装置

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DE2529473A1 (de) † 1975-07-02 1977-01-13 Danfoss As Gleitschuhanordnung, insbesondere fuer axial- und radialkolbenmaschinen
DE19507295A1 (de) † 1995-03-02 1996-09-05 Rexroth Mannesmann Gmbh Radialkolbenpumpe, insbesondere Kraftstoffpumpe für einen Verbrennungsmotor

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DE19523283B4 (de) * 1995-06-27 2006-01-19 Robert Bosch Gmbh Pumpe, insbesondere Hochdruckpumpe für eine Kraftstoffeinspritzvorrichtung eines Verbrennungsmotors
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GB9610785D0 (en) * 1996-05-23 1996-07-31 Lucas Ind Plc Radial piston pump
JPH1030525A (ja) * 1996-07-16 1998-02-03 Denso Corp 高圧サプライポンプ
IT239879Y1 (it) * 1996-12-23 2001-03-13 Elasis Sistema Ricerca Fiat Perfezionamenti ad una pompa a pistoni, in particolare ad una pompa apistoni radiali per il carburante di un motore a combustione interna.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2529473A1 (de) † 1975-07-02 1977-01-13 Danfoss As Gleitschuhanordnung, insbesondere fuer axial- und radialkolbenmaschinen
DE19507295A1 (de) † 1995-03-02 1996-09-05 Rexroth Mannesmann Gmbh Radialkolbenpumpe, insbesondere Kraftstoffpumpe für einen Verbrennungsmotor

Also Published As

Publication number Publication date
WO1999028625A1 (fr) 1999-06-10
JP4308921B2 (ja) 2009-08-05
EP0970309A1 (fr) 2000-01-12
DE59809494D1 (de) 2003-10-09
JP2001510531A (ja) 2001-07-31
US6250893B1 (en) 2001-06-26
DE19753593A1 (de) 1999-06-17
EP0970309B1 (fr) 2003-09-03

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