EP0950149A1 - Radial piston pump for high pressure fuel supply - Google Patents
Radial piston pump for high pressure fuel supplyInfo
- Publication number
- EP0950149A1 EP0950149A1 EP98942485A EP98942485A EP0950149A1 EP 0950149 A1 EP0950149 A1 EP 0950149A1 EP 98942485 A EP98942485 A EP 98942485A EP 98942485 A EP98942485 A EP 98942485A EP 0950149 A1 EP0950149 A1 EP 0950149A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- opening
- housing
- housing part
- piston pump
- drive shaft
- 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.)
- Granted
Links
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
- F04B1/0443—Draining of the housing; Arrangements for handling leaked fluids
-
- 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
- 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
- F04B53/04—Draining
Definitions
- the invention relates to a radial piston pump for supplying high-pressure fuel in fuel injection systems of internal combustion engines, in particular in a common rail injection system, with a drive shaft mounted in a pump housing, which is eccentrically formed or has a plurality of cam-like elevations in the circumferential direction, and preferably a plurality of radially in relation to the drive shaft pistons arranged in a respective cylinder space, which can be moved back and forth in the cylinder space in the radial direction when the drive shaft is rotated, and with check valves on the intake side and the high pressure side, wherein for each piston a metallic housing part forming the respective cylinder space with a fuel supply opening and a fuel discharge opening is provided.
- the housing part is supported and sealed against other housing areas by a number of elastomeric sealing elements. This leads to an undefined arrangement of the components of the pump.
- the present invention has for its object to provide a radial piston pump that is high-pressure-tight to 2000 bar, in which the high-pressure components and their sealing points are decoupled from one another and statically exactly defined in the assembled state.
- a radial piston pump of the type described in the introduction in that the housing part bears with respect to the drive shaft from the outside with a flat contact surface against a metallic housing base body and a projecting section of the housing part facing the drive shaft concentric with the cylinder space extends through a radial opening of the housing base body
- Direction extends to the drive shaft that the fuel supply opening and the fuel discharge opening open in the flat contact surface and are aligned with further supply or discharge openings in the housing base body, and that the housing part is tightened against the housing base body by screws such that the contact surfaces without intermediate arrangement of sealing elements effect a high pressure seal.
- the invention proposes to effect sealing via flat metallic contact surfaces of the respective radially outer housing part and the housing base body, which are attracted to one another .
- the fuel supply and the fuel discharge into or out of the cylinder space take place via the respective fuel supply opening and the fuel discharge opening, which on the one hand open into the intake or compression space and on the other hand into the contact surface of the housing part facing the basic housing body.
- the housing part can rest against the basic housing body in a statically determined manner without the interposition of any sealing elements.
- all the sealing points subjected to high pressure are formed by metallic components which are attracted to one another without the interposition of additional sealing elements.
- the surfaces of the metallic components sealingly against one another are machined, in particular lapped, in order to produce a desired surface roughness. If the lapping is difficult or not feasible because a component in question has a projecting pin or the like. has a surface texture sufficient to form a hard seal (metal on metal) can be achieved by hard turning, ie machining after heat curing.
- the projecting section of the housing part facing the drive shaft forms a centering collar with which the housing part can be positioned in the radial opening of the housing base body.
- suction-side and the high-pressure side check valve are integrated into the respective housing part forming the cylinder space.
- the cylinder space could be formed by a radially outward blind bore in the housing part.
- the housing part has a through-opening which forms the cylinder space and runs radially to the drive shaft and which is closed radially on the outside by a metallic closure element which is screwed into the through-opening.
- an angular or bead-shaped circumferential elevation is formed on the end face of the closure element, which leads to a sealing plastic deformation along the elevation when the components are tightened against one another.
- the elevation itself is not deformed but only forms the hard seal of the flat surfaces.
- This seal which is referred to as the biting edge technique, is not limited to the sealing of the radial through opening in the housing part forming the cylinder space by means of the closure element, but also to other insert parts, in particular screw-in parts, such as, for example, the closure of an access opening to a check valve, or a screw-in high-pressure nozzle applicable.
- Figure 1 is a plan view of an embodiment of the radial piston pump according to the invention in the direction of the drive shaft;
- Figure 2 shows a longitudinal section along the line II-II in Figure 1;
- Figure 3 is a plan view of the radially outer one
- Housing part forming cylinder space in the direction of arrows III-III in FIG. 2;
- Figure 4 shows a detail of Figure 2 in an enlarged view.
- FIGS. 1 and 2 show a radial piston pump for supplying high-pressure fuel in fuel injection systems, in particular in common rail systems, to internal combustion engines.
- the radial piston pump is designed with an integrated demand control.
- the principle of suction throttle control is used as the control concept.
- the fuel supply and dimensioning takes place via a metering unit, not shown.
- the radial piston pump comprises a drive shaft 4, which is mounted in a pump housing, generally designated by reference number 2, with an eccentrically designed shaft section 6.
- Three pistons 10, each offset by 120 ° from one another in the radial direction, are supported against the outer lateral surface of the drain bushing 8, which can be cylindrical or polygonal.
- the pistons 10 comprise a plunger 14 guided in a cylinder space 12, on the end of which facing the drive shaft 4 a plate-shaped contact section 16 is formed, with which the respective piston 10 against the outer lateral surface of the drain bushing 8 underneath Bias of a spring 18 is supported.
- the cylinder chamber 12 of a respective tappet 14 is formed by a through opening 20 running radially to the drive shaft 4 and a pump piston 10 radially movable in this through opening in a radially outer housing part 22.
- the housing part 22 is essentially block-shaped and has a contact surface 26, which faces the drive shaft 4 and runs perpendicular to the longitudinal direction of the through opening 20, by means of which the housing part 22 bears against a likewise flat contact surface 28 of a basic housing body 30 which faces radially outward from the drive shaft 4.
- a locking element 32 designed as a locking screw is sealingly screwed into an enlarged, radially outer end section 31 of the through opening 20.
- a disc-shaped element 38 with a central opening 40 and with at least one radial opening 42 extending from the central opening 40 is inserted between the end face 34 of the closure element 32 and an axial step 36 in the through opening 20.
- the radial opening 42 communicates with a fuel supply opening 44 and 46 in the housing part 22, which opens into the contact surface 26 of the housing part 22 and is aligned with a further supply opening 47 in the basic housing body 30.
- a check valve 48 on the suction side is provided on the side of the disk-shaped element 38 facing the pump piston.
- a pot-shaped holder in which a compression spring is accommodated, which prestresses a disk-shaped valve body against the central opening 40 in the disk element 38.
- a Kraf substance discharge opening 60 From the cylinder chamber 12 leads a Kraf substance discharge opening 60, in which a high pressure side check valve 62 is housed and in another
- Kraf substance discharge opening 61 which also opens into the contact surface 26 of the housing part 22 and is aligned with another discharge line 65 leading to a high-pressure nozzle 64.
- the housing part 22 comprises a section 66 projecting to the drive shaft 4 and concentric to the cylinder space 12, which engages in a radial opening 67 in the housing base body 30.
- a centering collar 68 is provided with which the housing part 22 is positioned in the radial opening 67.
- the housing part 22 is tightened by screws 69 against the housing base body 30 in such a way that the contact surface 26 of the housing part 22 and the contact surface 28 of the housing base body 30 bring about a high-pressure seal in direct metallic contact with one another, so that the fuel supply openings 46, 47 and the further supply or Discharge openings 61, 65 are sealed in the housing base body 30, without the need to use additional sealing elements.
- a statically precisely defined position of the housing part 22 on the housing base body 30 is achieved, and all of them
- High pressure sealing points are decoupled from each other. Because the check valves 48, 62 are accommodated in the radially outer housing part 22, this housing part can be preassembled as an assembly and can be separately pressure-tested.
- the sealing of the diameter-widened radially outer end section 31 of the through opening 20 by the screwed-in closure element 32 takes place in that a bead-like elevation 70, a so-called biting edge, is provided on the end face 34 of the closure element 32, which surrounds the central opening 40 in the disc element 38 "digs" into the metal of the disk element 38 when the closure element 32 is tightened.
- the disk element 38 is pressed with its opposite side against the axially hard-turned step 36 in such a way that a high-pressure seal is also achieved there.
- a bite edge 74 is also formed on the end face 72 of the high-pressure nozzle 64.
- a screw plug 76 which closes an assembly and access opening to the high-pressure check valve 62, is tightened against a step with a biting edge.
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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19729789A DE19729789A1 (en) | 1997-07-11 | 1997-07-11 | Radial piston pump for high-pressure fuel supply |
DE19729789 | 1997-07-11 | ||
PCT/DE1998/001828 WO1999002859A1 (en) | 1997-07-11 | 1998-07-02 | Radial piston pump for high pressure fuel supply |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0950149A1 true EP0950149A1 (en) | 1999-10-20 |
EP0950149B1 EP0950149B1 (en) | 2003-10-15 |
Family
ID=7835424
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98942485A Expired - Lifetime EP0950149B1 (en) | 1997-07-11 | 1998-07-02 | Radial piston pump for high pressure fuel supply |
Country Status (5)
Country | Link |
---|---|
US (1) | US6139284A (en) |
EP (1) | EP0950149B1 (en) |
JP (1) | JP2001500223A (en) |
DE (2) | DE19729789A1 (en) |
WO (1) | WO1999002859A1 (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19841642C2 (en) * | 1998-09-11 | 2002-07-18 | Bosch Gmbh Robert | Radial piston pump |
DE19859188B4 (en) * | 1998-12-21 | 2013-11-21 | Continental Automotive Gmbh | high pressure pump |
IT1308782B1 (en) * | 1999-07-02 | 2002-01-10 | Elasis Sistema Ricerca Fiat | IMPROVEMENTS TO A HIGH PRESSURE PUMP FOR THE FUEL SUPPLY TO AN INTERNAL COMBUSTION ENGINE. |
DE10046315C2 (en) * | 2000-09-19 | 2002-11-14 | Siemens Ag | High pressure pump for a storage injection system and storage injection system |
DE10310123A1 (en) * | 2003-03-07 | 2004-09-23 | Siemens Ag | Radial piston pump |
DE10326880A1 (en) * | 2003-06-14 | 2004-12-30 | Daimlerchrysler Ag | Radial piston pump for fuel high pressure generation in fuel injection systems of internal combustion engines |
DE10339278B3 (en) * | 2003-08-26 | 2005-01-27 | Siemens Ag | Radial piston pump for fuel injection system has tightening force applied by bracket to region of cylinder head |
DE102004015263A1 (en) | 2004-03-29 | 2005-10-20 | Siemens Ag | Radial piston pump |
ES2542856T3 (en) * | 2007-10-12 | 2015-08-12 | Delphi International Operations Luxembourg S.À R.L. | Improvements related to fuel pumps |
US8122811B2 (en) * | 2007-11-12 | 2012-02-28 | Denso Corporation | Fuel injection pump and method for assembling the same |
DE102008043993B3 (en) * | 2008-11-21 | 2010-04-29 | Thielert Aircraft Engines Gmbh | Common-rail high-pressure pump |
DE102013210036A1 (en) * | 2013-05-29 | 2014-12-04 | Robert Bosch Gmbh | High pressure pump for a fuel injection system |
CN103883450A (en) * | 2014-04-14 | 2014-06-25 | 北京亚新科天纬油泵油嘴股份有限公司 | High-pressure common rail pump |
JP2016020678A (en) * | 2014-07-16 | 2016-02-04 | 臼井国際産業株式会社 | Terminal seal structure of direct gasoline-injection engine fuel rail |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2271570A (en) * | 1940-07-31 | 1942-02-03 | Harvey S Pardee | Pump |
US2621607A (en) * | 1947-01-03 | 1952-12-16 | Trapp George Joseph | Pump |
GB681625A (en) * | 1950-05-03 | 1952-10-29 | Hobson Ltd H M | Improvements in hydraulic pumps |
CH402613A (en) * | 1961-02-27 | 1965-11-15 | Hatz Motoren | Piston pump with pump units arranged in a star shape |
US3527547A (en) * | 1967-03-15 | 1970-09-08 | Rexroth Gmbh G L | Radial piston pump |
FR2199351A5 (en) * | 1972-09-11 | 1974-04-05 | Gury Hydraulique Sa | |
DE2901240C2 (en) * | 1979-01-13 | 1981-10-01 | Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen | Radial piston pump |
DE3008575C2 (en) * | 1980-03-06 | 1984-02-02 | Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen | Radial piston pump |
DE3840691C2 (en) * | 1988-12-02 | 1997-02-13 | Teves Gmbh Alfred | Radial piston pump |
DE4213798C2 (en) * | 1992-04-27 | 2002-10-24 | Bosch Gmbh Robert | Radial piston pump, in particular fuel pump for internal combustion engines |
DE4301521A1 (en) * | 1993-01-21 | 1994-07-28 | Bosch Gmbh Robert | Pressure valve |
US5382140A (en) * | 1993-02-11 | 1995-01-17 | Elasis Sistema Ricerca Fiat Nel Mezzogiorno | Radial-piston pump |
NL9301010A (en) * | 1993-06-11 | 1995-01-02 | Applied Power Inc | Radial piston pump. |
DE4419927A1 (en) * | 1994-06-08 | 1995-12-14 | Bosch Gmbh Robert | Piston pump |
DE19711557A1 (en) * | 1997-03-20 | 1998-09-24 | Schaeffler Waelzlager Ohg | Radial piston pump |
-
1997
- 1997-07-11 DE DE19729789A patent/DE19729789A1/en not_active Ceased
-
1998
- 1998-07-02 EP EP98942485A patent/EP0950149B1/en not_active Expired - Lifetime
- 1998-07-02 US US09/254,633 patent/US6139284A/en not_active Expired - Fee Related
- 1998-07-02 DE DE59809925T patent/DE59809925D1/en not_active Expired - Lifetime
- 1998-07-02 JP JP11507985A patent/JP2001500223A/en active Pending
- 1998-07-02 WO PCT/DE1998/001828 patent/WO1999002859A1/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9902859A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2001500223A (en) | 2001-01-09 |
EP0950149B1 (en) | 2003-10-15 |
US6139284A (en) | 2000-10-31 |
DE59809925D1 (en) | 2003-11-20 |
WO1999002859A1 (en) | 1999-01-21 |
DE19729789A1 (en) | 1999-01-14 |
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