EP2207958B1 - Pompe à pistons radiaux à corps de base prismatique pour système d'injection de carburant - Google Patents

Pompe à pistons radiaux à corps de base prismatique pour système d'injection de carburant Download PDF

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Publication number
EP2207958B1
EP2207958B1 EP08804452A EP08804452A EP2207958B1 EP 2207958 B1 EP2207958 B1 EP 2207958B1 EP 08804452 A EP08804452 A EP 08804452A EP 08804452 A EP08804452 A EP 08804452A EP 2207958 B1 EP2207958 B1 EP 2207958B1
Authority
EP
European Patent Office
Prior art keywords
radial piston
pump
basic body
piston pump
elements
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
EP08804452A
Other languages
German (de)
English (en)
Other versions
EP2207958A2 (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 EP2207958A2 publication Critical patent/EP2207958A2/fr
Application granted granted Critical
Publication of EP2207958B1 publication Critical patent/EP2207958B1/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
    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • 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
    • F04B53/22—Arrangements for enabling ready assembly or disassembly

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 according to the preamble of claim 1.
  • Such a radial piston pump is through EP-A-1 223 334 known.
  • This radial piston pump has at least one pump element arranged radially relative to a drive shaft mounted in a pump housing, wherein the pump elements are actuated by the drive shaft and each have a suction side and a high-pressure side.
  • the pump housing comprises a prismatic base body, which has a number of pump elements corresponding number of radially arranged receiving bores.
  • a fastening flange is provided, which has a first bearing for the drive shaft.
  • a bearing cap is provided, in which a second bearing is arranged for the drive shaft.
  • the mounting flange and the bearing cap are each connected via connecting means in the form of a screw connection to the base body, wherein the screw connection extends through the base body. Through the holes for the screw the production of the body is expensive and the body is weakened.
  • a radial piston pump having at least one with respect to a mounted in a pump housing drive shaft radially arranged pump element, wherein the pump elements are actuated by the drive shaft and each have a suction side and a high pressure side.
  • the pump housing comprises a prismatic base body, which has a number of pump elements corresponding number of radially arranged receiving bores.
  • a fastening flange is provided, which has a first bearing for the drive shaft.
  • a lid is provided through which an opening for a arranged in the main body second bearing for the drive shaft is closed. The mounting flange and the lid are each attached to the main body, which must be designed accordingly.
  • a radial piston pump having at least one with respect to a mounted in a pump housing drive shaft radially arranged pump element, wherein the pump elements are actuated by the drive shaft and each have a suction side and a high pressure side.
  • the pump housing comprises a prismatic base body, which has a number of pump elements corresponding number of radially arranged receiving bores. Two bearings for the drive shaft are arranged in a bore of the base body, which is thus expensive to produce.
  • the radial piston pump according to the invention with the features of claim 1 has the advantage that the pump housing with the main body is easy to manufacture, since no precautions for the arrangement of the bearing and for mounting the mounting flange and the bearing cap are erfoderlich to this.
  • the pump elements of the radial piston pump according to the invention comprise a piston, a cylinder and a cylinder head, wherein the piston oscillates in the cylinder and limits a delivery space.
  • cylinder and cylinder head in one piece or as separate components.
  • the cylinder and cylinder head of the pump elements are releasably connected, in particular by a screw connection or by welding, to the base body.
  • the pump elements or the stationary parts of the pump elements are releasably connected, in particular by a screw connection or by welding, to the base body.
  • the complexity of the pump housing according to the invention can be further reduced by providing low-pressure channels in the base body and / or the bearing cap, and by connecting the low-pressure channels with the suction side of the pump element (s). This makes it possible to produce the low-pressure channels outside of the pump housing, which usually brings a manufacturing simplification with it.
  • the radial piston pump according to the invention it is also possible in the radial piston pump according to the invention to integrate further assemblies of the low pressure region of the fuel injection system, such as a metering unit or a KÜV and other more in the bearing cap. Because the bearing cap or the mounting flange is only subjected to the low pressure and is not exposed to the delivery pressure of the radial piston pump of over 2,000 bar, it is often sufficient to produce the mounting flange and / or the bearing cap made of aluminum or a high-strength plastic. As a result, manufacturing costs can be saved to a considerable extent and it can be used other and very economical production processes, such as plastic syringes. These manufacturing methods are not applicable to a conventional pump housing.
  • the base body is produced by forming, in particular by hot rolling, cold rolling and / or extrusion. Forging is also an alternative. In any case, all forming processes have in common that the properties of the blank or semi-finished product produced in this way are very good by forming a structural improvement takes place. This also further increases the load capacity of the pump housing according to the invention.
  • FIG. 1 shows a partial longitudinal section through a pump housing according to the invention.
  • the pump housing according to the invention essentially comprises a prismatic base body 1, which has a receiving bore 5.1.
  • This receiving bore 5.1 is arranged radially and orthogonal to a longitudinal axis 3, as is apparent from the section along the line AA in the right part of FIG. 1 results.
  • the receiving bore 5.1 serves a pump element (not shown in FIG FIG. 1 ).
  • a flattening 7.1 is provided on the prismatic base body 1. This flattening 7.1 serves as a contact surface and / or sealing surface for the pump element, not shown.
  • the flattening 7.1 can be made either already during the forming of the main body 1, for example by extrusion. Alternatively, it is also possible to produce the base body 1 as a thick-walled tube with a circular-cylindrical cross section and then produce the flattening 7.1, for example by milling or turning. Of course, it is also possible to perform the receiving bore 5.1 as a stepped bore and to produce the flattening 7.1 with a correspondingly shaped step drill.
  • a mounting flange 9 is provided at a first end face (without reference numeral) of the main body 1.
  • the mounting flange 9 has a compatible with the inner diameter D i of the prismatic body 1 cylindrical projection 11.
  • a bearing cap 17 is present, which likewise has a projection 11 and a bearing surface 13.
  • the bearing cap 17 is closed in contrast to the mounting flange 9, and thus seals an interior of the prismatic body 1 from liquid-tight.
  • the radial piston pump according to the invention should have only one pump element, only the receiving bore 5.1 and the flattening 7.1 is machined out of the blank of the base body 1.
  • the radial piston pump is to have two pump elements, 180 ° to the receiving bore 5.1 and the flattening 7.1 offset a second receiving bore 5.2 and a second flattening 7.2 from the prismatic body 1 worked out.
  • the radial piston pump according to the invention is used for high pressure supply of a very powerful engine, it may also be necessary to provide three pump elements.
  • a total of three receiving bores 5.1, 5.3 and 5.4 and three flats 7.1, 7.3 and 7.4 worked out of the blank of the base body 1.
  • the optional additional receiving bores 5.2, 5.3 and 5.4 are indicated by broken lines in section A-A. It should be emphasized that the main body 1 is made of the same blank regardless of the number of pump elements.
  • FIG. 2 is an embodiment of a radial piston pump according to the invention with two pump elements 29, which are arranged offset 180 ° to each other, shown in section.
  • a drive shaft 23 is provided in the interior of the main body 1.
  • the drive shaft 23 is rotatably mounted on the bearings 13 of the mounting flange 9 and the bearing cap 17.
  • This in FIG. 2 illustrated embodiment of a drive shaft 23 has an eccentric portion 25 on which a polygon ring, as is known from the prior art, is rotatably mounted.
  • the invention is not limited to this type, but can be equipped with all types of eccentric shafts or camshafts.
  • a pump element 29, comprising inter alia a piston 31, a cylinder 33 and a cylinder head 35, is used.
  • the cylinder head 35 and the cylinder 33 are integrally formed.
  • a coil spring 39 is clamped, which holds the piston foot 37 and thus the piston 31 against the polygon ring 27.
  • the piston 31, the cylinder 33 and the cylinder head 35 define a delivery space 41st
  • a high-pressure passage 43 extends from the delivery chamber 41 perpendicular to the plane of the drawing and provides the hydraulic connection between a pressure-side check valve (not shown) and the common rail (also not shown) of the fuel injection system.
  • suction side of the pump elements 29 is shown.
  • This suction side includes a check valve 45, low pressure channels 47.1, 47.2 and 47.3 and an annular groove 49th
  • the annular groove 49 is arranged on the outer diameter of the projection 11 of the bearing cap 17 and is supplied via a fuel supply, not shown, by a prefeed pump with fuel from a fuel tank.
  • the check valve 45 is fastened by a cover 51 in the cylinder head 35.
  • the pump housing according to the invention which comprises a prismatic main body 1 and is supplemented by a mounting flange 9 and a bearing cap 17, firstly has a very simple structure, since the main body 1 has a prismatic shape. This makes it possible to produce this basic body 1 by forming or turning from the solid. At the same time, a large number of high-performance materials are available.
  • the same prismatic body can be used for both radial piston pumps with one or more pumping elements.
  • the bearings of the mounting flange 9, the drive shaft 23, the polygon ring 27, the bearing cap 17 are independent of the number of pump elements used 29.
  • the base body 1 is adapted to the desired number of pump elements 29, that correspondingly many receiving holes 5 and 7 flats radially Distributed distributed over the circumference in the base body 1. This also makes it possible to produce radial piston pumps with different flow rates on a production line, so that they can be utilized very evenly and all radial piston pumps can use the same manufacturing technology.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Claims (8)

  1. Pompe à pistons radiaux pour l'alimentation en 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 au moins un élément de pompe (29) disposé radialement par rapport à un arbre d'entraînement (23) monté dans un boîtier de pompe, le ou les élément(s) de pompe (29) étant actionné(s) par l'arbre d'entraînement (23) et présentant chacun un côté d'aspiration et un côté haute pression (43), le boîtier de pompe comprenant un corps de base prismatique (1), qui présente un nombre d'alésages de réception (5) disposés radialement correspondant au nombre des éléments de pompe (29), une bride de fixation (9) étant prévue sur un premier côté frontal du corps de base (1), laquelle présente un premier palier (13) pour l'arbre d'entraînement (23), un couvercle de palier (17) étant prévu sur un deuxième côté frontal du corps de base (1), lequel présente un deuxième palier (13) pour l'arbre d'entraînement (23), caractérisée en ce que des moyens de connexion, notamment une connexion vissée (21), sont prévus entre la bride de fixation (9) et le couvercle de palier (17), et en ce que les moyens de connexion (21) sont disposés en dehors du corps de base (1).
  2. Pompe à pistons radiaux selon la revendication 1, caractérisée en ce qu'un contour extérieur du corps de base (1) présente une section transversale en forme de polygone régulier, notamment avec trois ou quatre méplats (7), et en ce que les alésages de réception (5) s'étendent perpendiculairement au ou aux méplat(s) (7).
  3. Pompe à pistons radiaux selon l'une quelconque des revendications précédentes, caractérisée en ce que chaque élément de pompe (29) présente un piston (31), un cylindre (33) et une culasse (35), et en ce que le piston (31) oscille dans le cylindre (33), et limite un espace de refoulement (41).
  4. Pompe à pistons radiaux selon l'une quelconque des revendications précédentes, caractérisée en ce que le cylindre (33) et la culasse (35) sont réalisés d'une seule pièce.
  5. Pompe à pistons radiaux selon l'une quelconque des revendications précédentes, caractérisée en ce que chaque élément de pompe (29) est connecté de manière amovible, notamment par une connexion vissée, ou de manière inamovible, notamment par soudage, au corps de base (1).
  6. Pompe à pistons radiaux selon l'une quelconque des revendications précédentes, caractérisée en ce que des canaux basse pression (43.4, 49) sont prévus dans le corps de base (1) et/ou dans le couvercle de palier (17), et en ce que les canaux basse pression (43.4, 49) sont connectés au côté d'aspiration du ou des élément(s) de pompe (29).
  7. Pompe à pistons radiaux selon l'une quelconque des revendications précédentes, caractérisée en ce qu'un premier clapet antiretour (45) est disposé à chaque fois du côté d'aspiration du ou des élément(s) de pompe (29), et en ce qu'un deuxième clapet antiretour est disposé à chaque fois du côté haute pression du ou des élément(s) de pompe.
  8. Pompe à pistons radiaux selon l'une quelconque des revendications précédentes, caractérisée en ce que le corps de base (1) est fabriqué par façonnage, notamment par laminage à chaud, par laminage à froid et/ou par filage.
EP08804452A 2007-11-06 2008-09-19 Pompe à pistons radiaux à corps de base prismatique pour système d'injection de carburant Not-in-force EP2207958B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007052748A DE102007052748A1 (de) 2007-11-06 2007-11-06 Radialkolbenpumpe mit einem prismatischem Grundkörper für ein Kraftstoffeinspritzsystem
PCT/EP2008/062518 WO2009059835A2 (fr) 2007-11-06 2008-09-19 Pompe à pistons radiaux à corps de base prismatique pour système d'injection de carburant

Publications (2)

Publication Number Publication Date
EP2207958A2 EP2207958A2 (fr) 2010-07-21
EP2207958B1 true EP2207958B1 (fr) 2011-03-16

Family

ID=40514402

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08804452A Not-in-force EP2207958B1 (fr) 2007-11-06 2008-09-19 Pompe à pistons radiaux à corps de base prismatique pour système d'injection de carburant

Country Status (4)

Country Link
EP (1) EP2207958B1 (fr)
AT (1) ATE502210T1 (fr)
DE (2) DE102007052748A1 (fr)
WO (1) WO2009059835A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009026417A1 (de) * 2009-05-22 2010-12-02 Robert Bosch Gmbh Pumpengehäuse eines Kraftfahrzeug-Hydroaggregats
US8333572B2 (en) * 2010-07-06 2012-12-18 Jongherya Co., Ltd. Pump

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2557731B1 (de) * 1975-12-20 1977-04-28 Langen & Co Hydraulische Radialkolbenpumpe
DE19716242A1 (de) 1997-04-18 1998-10-22 Bosch Gmbh Robert Kraftstoffhochdruckpumpe
DE19802476A1 (de) * 1998-01-23 1999-07-29 Bosch Gmbh Robert Pumpenanordnung zur Kraftstoffhochdruckversorgung
GB0100667D0 (en) 2001-01-10 2001-02-21 Delphi Tech Inc Fuel pump
DE10221305A1 (de) 2002-05-14 2003-11-27 Bosch Gmbh Robert Radialkolbenpumpe für Kraftstoffeinspritzsystem mit verbesserter Hochdruckfestigkeit
JP4650629B2 (ja) 2004-11-16 2011-03-16 株式会社アドヴィックス ラジアルプランジャポンプ

Also Published As

Publication number Publication date
EP2207958A2 (fr) 2010-07-21
ATE502210T1 (de) 2011-04-15
WO2009059835A3 (fr) 2009-06-25
WO2009059835A2 (fr) 2009-05-14
DE102007052748A1 (de) 2009-05-07
DE502008002914D1 (de) 2011-04-28

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