WO1999002857A2 - Radialkolbenpumpe zur kraftstoffhochdruckversorgung - Google Patents
Radialkolbenpumpe zur kraftstoffhochdruckversorgung Download PDFInfo
- Publication number
- WO1999002857A2 WO1999002857A2 PCT/DE1998/001790 DE9801790W WO9902857A2 WO 1999002857 A2 WO1999002857 A2 WO 1999002857A2 DE 9801790 W DE9801790 W DE 9801790W WO 9902857 A2 WO9902857 A2 WO 9902857A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- piston pump
- radial piston
- drive shaft
- pressure
- pump according
- Prior art date
Links
Classifications
-
- 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
- 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
- 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
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
-
- 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
- F04B1/0408—Pistons
-
- 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
- F04B1/0448—Sealing means, e.g. for shafts or housings
Definitions
- the invention relates to a radial piston pump for high-pressure fuel supply
- 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 has a plurality of pistons arranged radially with respect to the drive shaft in a respective cylinder space, which at Turning the drive shaft back and forth in the cylinder space in the radial direction and the end faces facing away from the drive shaft a respective suction or. Limit the compressor space, and with check valves on the suction side and the high pressure side.
- Such a radial piston pump is sold by the applicant under the trade name CP1.
- the assembly forces are introduced via several components that are supported against one another.
- a number of elastomeric sealing elements are used for sealing.
- the present invention is based on the problem of a high pressure density of up to 2000 bar To create a radial piston pump with a small dead space and correspondingly high efficiency, in which the high-pressure components and their sealing points are decoupled from one another and statically precisely defined.
- a metallic insert part forming the respective cylinder space is provided inside the housing and radially to the drive shaft, which communicates with the suction side and with the high pressure side, and in that the respective insert part in the direction of the drive shaft between two flange-shaped metallic housing parts with contact surfaces running perpendicular to the drive shaft and that the respective insert part has a fuel supply opening and a fuel discharge opening, which open in the region of the contact surfaces and are aligned with a further supply or discharge opening in the housing parts, and that the flange-shaped housing parts are attracted to one another with the interposition of the insert parts in such a way that the contact surfaces of the respective insert part and the housing parts without an interposition of you effect a high pressure seal.
- all the sealing points subjected to high pressure are formed by metal components which are tightened against one another without intermediate arrangement of additional sealing elements, ie so-called hard seals.
- Components preferably have lapped contact surfaces.
- the lapping process creates a desired surface roughness while maintaining dimensional accuracy.
- suction-side and the high-pressure side check valve is integrated outside the insert part in the respective housing part and the downstream side of the high-pressure side check valve extends to a high-pressure nozzle entirely inside the housing part, then the high-pressure side is through the hard (only) t to HH in o in oo in
- FIG. 1 shows a longitudinal section of a radial piston pump according to the invention
- FIG. 2 shows a section along the plane AA in FIG. 1;
- FIG. 3 shows a section with stepped section plane B - B in FIG. 2;
- FIG. 4 shows an individual representation of the insert part of the radial piston pump that forms the cylinder space.
- Figures 1 and 2 show a radial piston pump for high-pressure fuel supply
- Fuel injection systems especially in common rail systems, of 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 pump housing, which is generally designated by the reference number 2
- a drain bushing 8 is provided, against which the shaft section 6 can be rotated.
- a drain bushing 8 is provided, against which the shaft section 6 can be rotated.
- the pistons 10 comprise a plunger 14 guided in a cylinder chamber 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 is supported against the outer lateral surface of the outlet bush 8 under the pretension of a spring 18.
- the cylinder chamber 12 of a respective tappet 14 of the pump piston 10 is formed by a through opening 20 running radially to the drive shaft 4 in an insert part 22 (FIG. 4).
- the insert 22 is essentially block-shaped with at least two flat side surfaces 24 and 26 running parallel to one another.
- the insert element 22 is arranged with its through opening 20 forming the cylinder space 12 radially to the drive shaft 4 in accordance with the position of the plunger pistons 10.
- the through opening 20 is stepped and has an enlarged end section 28 of larger diameter on the side facing away from the drive shaft 4.
- a closure element 30 designed as a screw is screwed into this end section 28 in order to seal the cylinder space 12 to the outside in a manner to be described in more detail.
- a fuel supply opening 32 and a fuel discharge opening 34 are also provided in the insert element 22, which extend from the cylinder space 12 in the radial direction outwards and open into the previously mentioned mutually parallel side surfaces 24, 26.
- the insert 22 is, as can be seen in detail from FIGS. 1 and 3, arranged in the direction of the drive shaft 4 between two flange-shaped metallic housing parts 48, 50.
- the housing parts 48, 50 likewise have flat contact surfaces 52, 54 which bear against the side surfaces 24, 26 of the insert part 22 running parallel to one another, forming a so-called hard seal.
- the flat contact surfaces 52, 54 of the flange-shaped housing parts 48, 50 run in one plane without a circumferential edge or any other
- housing parts 48, 50 Protrudes over the respective contact surface 52, 54.
- the surface of these housing parts 48, 50 can therefore be machined very well; they are preferably lapped to form a suitable surface finish (roughness depth of ).
- the flange-shaped housing parts 48, 50 are tightened against one another by means of screws 56 (FIGS. 2, 3), with the insert part 22 being arranged in such a way that the contact surfaces 52, 54 and 24, 26 of the housing parts and insert part are pressed against one another in such a flat manner that a
- High pressure sealing is effected.
- the fuel supply opening 32 or discharge opening 34 opening into the contact surface 24 or 26 is aligned with a further fuel supply duct 58 in the flange-shaped housing part 48 or with a high-pressure duct 60 in the other flange-shaped housing part 50. Due to the planar contact of the insert part 22 with the housing parts 48, 50, the fuel supply and the fuel discharge are effectively sealed without having to use any additional sealing elements which would call into question a statically exact definition of the components mounted against one another.
- two positioning pins 57 are used which extend parallel to the screws 56 and are parallel to the drive shaft 4 extend through precisely dimensioned through bores through the insert part 22 and immerse in blind hole bores 59 in the flange-shaped housing part 48 or 50.
- the previously mentioned check valve 42 on the low-pressure side or 44 on the high-pressure side is accommodated in an expanded section of the fuel supply duct 58 or the fuel discharge duct 60 outside the insert part 22.
- the closure element 30 has a circular circumferential biting edge 64 on its end face 62 facing the piston.
- This biting edge 64 is to be understood as a circumferential bead-like elevation which preferably forms an edge which is formed against an axial step 66 between the diameter-widened section 28 and the cylinder space 12. Tightening the closure element 30 results in a high-pressure-sealing plastic deformation of the bite edge 64 and the axial step 66.
- the fuel discharge duct 60 forming the high-pressure side 42 extends entirely within the flange-shaped housing part 50.
- the high-pressure side 42 is thus comprehensively sealed by the above-described hard seal between the insert part 22 and the flange-shaped housing parts 48, 50; it is only supplemented by a high-pressure nozzle 68 and a pressure relief valve 70, both of which are statically exactly defined in relation to the flange-shaped housing part 50.
- the high-pressure nozzle 68 has a bite edge 70 which corresponds to the bite edge 64 of the closure element 30 and which is tightly tightened against a circularly extending shoulder 72.
- the intake-side check valve 44 closes and, after the opening pressure has been exceeded, the high-pressure check valve 46 is opened, and the fuel compressed to high pressure is conveyed to an engine piston or a high-pressure storage space of a common rail system via high-pressure duct 60 and high-pressure nozzle 68.
- the radial piston pump according to the invention is highly pressure-tight against 2000 bar;
- the check valves 44 and 46 are locally close to the suction or compression chamber 38, so that the dead space is very small and the efficiency of the pump is accordingly high.
- the flange-shaped housing part 48 on the low-pressure side and the insert part 22 are overlaid by a housing shell made of aluminum, which has a circumferential cylinder wall 74, the end face 76 facing the housing part 50 via an elastomeric sealing element abuts the housing part 50 to form a low-pressure seal.
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
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/254,448 US6238189B1 (en) | 1997-07-11 | 1998-06-30 | Radial piston pump for high-pressure fuel supply |
DE59809562T DE59809562D1 (de) | 1997-07-11 | 1998-06-30 | Radialkolbenpumpe zur kraftstoffhochdruckversorgung |
EP98941253A EP0925445B1 (de) | 1997-07-11 | 1998-06-30 | Radialkolbenpumpe zur kraftstoffhochdruckversorgung |
JP50797899A JP2001506343A (ja) | 1997-07-11 | 1998-06-30 | 燃料高圧供給のためのラジアルピストンポンプ |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19729792 | 1997-07-11 | ||
DE19729792.7 | 1997-07-11 | ||
DE19814477A DE19814477C2 (de) | 1997-07-11 | 1998-04-01 | Radialkolbenpumpe zur Kraftstoffhochdruckversorgung |
DE19814477.6 | 1998-04-01 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1999002857A2 true WO1999002857A2 (de) | 1999-01-21 |
WO1999002857A3 WO1999002857A3 (de) | 1999-04-01 |
Family
ID=26038229
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1998/001790 WO1999002857A2 (de) | 1997-07-11 | 1998-06-30 | Radialkolbenpumpe zur kraftstoffhochdruckversorgung |
Country Status (4)
Country | Link |
---|---|
US (1) | US6238189B1 (de) |
EP (1) | EP0925445B1 (de) |
JP (1) | JP2001506343A (de) |
WO (1) | WO1999002857A2 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001042651A1 (de) * | 1999-12-08 | 2001-06-14 | Robert Bosch Gmbh | Radialkolbenpumpe |
EP3088728A1 (de) * | 2015-04-28 | 2016-11-02 | Magneti Marelli S.p.A. | Kraftstoffpumpe für ein direkteinspritzsystem mit einer verbesserten hydraulischen abdichtung des einlassventils |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19744577A1 (de) * | 1997-10-09 | 1999-04-22 | Bosch Gmbh Robert | Radialkolbenpumpe zur Kraftstoffhochdruckversorgung |
DE19848040A1 (de) * | 1998-10-17 | 2000-04-20 | Bosch Gmbh Robert | Kolbenpumpe zur Kraftstoffhochdruckversorgung |
JP2002371941A (ja) * | 2001-06-18 | 2002-12-26 | Denso Corp | 燃料噴射ポンプ |
US6764286B2 (en) * | 2001-10-29 | 2004-07-20 | Kelsey-Hayes Company | Piston pump with pump inlet check valve |
US7021911B2 (en) * | 2003-03-26 | 2006-04-04 | Delphi Technologies, Inc. | Reverse-ported pump |
DE102006017036A1 (de) * | 2006-04-11 | 2007-10-18 | Siemens Ag | Radialkolbenpumpe zur Kraftstoff-Hochdruckversorgung bei einer Brennkraftmaschine |
DE102007050808A1 (de) * | 2007-10-24 | 2009-04-30 | Robert Bosch Gmbh | Hochdruckkraftstoffpumpe |
CN102852751B (zh) * | 2011-07-01 | 2016-03-16 | 德帕姆(杭州)泵业科技有限公司 | 一种直立工作的多柱塞式高压往复泵 |
CN103470416B (zh) * | 2013-09-26 | 2016-08-17 | 南岳电控(衡阳)工业技术股份有限公司 | 一种应用于高压共轨燃油喷射系统的径向柱塞供油泵 |
JP2016113897A (ja) * | 2014-12-11 | 2016-06-23 | 株式会社小金井精機製作所 | ディーゼルポンプ |
JP6317701B2 (ja) * | 2015-04-10 | 2018-04-25 | 株式会社デンソー | 高圧ポンプ |
CN214304212U (zh) * | 2021-03-09 | 2021-09-28 | 绿田机械股份有限公司 | 一种微型清洗机用泵单元 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4952121A (en) * | 1987-08-25 | 1990-08-28 | Weber S.R.L. | Radial piston pump with means preventing ovalization of piston chamber |
US4968220A (en) * | 1987-08-25 | 1990-11-06 | Renato Filippi | Radial piston pump, particularly a fuel injection pump for diesel engines |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4957416A (en) * | 1989-09-11 | 1990-09-18 | Dresser-Rand Company | Gas compressor |
JP2759861B2 (ja) * | 1992-10-02 | 1998-05-28 | 日清紡績株式会社 | 液圧ポンプ |
US5382140A (en) * | 1993-02-11 | 1995-01-17 | Elasis Sistema Ricerca Fiat Nel Mezzogiorno | Radial-piston pump |
DE69919658T2 (de) * | 1998-05-26 | 2005-09-15 | Caterpillar Inc., Peoria | Hydrauliksystem mit einer pumpe mit variabler fördermenge |
-
1998
- 1998-06-30 US US09/254,448 patent/US6238189B1/en not_active Expired - Fee Related
- 1998-06-30 JP JP50797899A patent/JP2001506343A/ja not_active Ceased
- 1998-06-30 WO PCT/DE1998/001790 patent/WO1999002857A2/de active IP Right Grant
- 1998-06-30 EP EP98941253A patent/EP0925445B1/de not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4952121A (en) * | 1987-08-25 | 1990-08-28 | Weber S.R.L. | Radial piston pump with means preventing ovalization of piston chamber |
US4968220A (en) * | 1987-08-25 | 1990-11-06 | Renato Filippi | Radial piston pump, particularly a fuel injection pump for diesel engines |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001042651A1 (de) * | 1999-12-08 | 2001-06-14 | Robert Bosch Gmbh | Radialkolbenpumpe |
US6843641B1 (en) | 1999-12-08 | 2005-01-18 | Robert Bosch Gmbh | Radial piston pump |
EP3088728A1 (de) * | 2015-04-28 | 2016-11-02 | Magneti Marelli S.p.A. | Kraftstoffpumpe für ein direkteinspritzsystem mit einer verbesserten hydraulischen abdichtung des einlassventils |
US9856844B2 (en) | 2015-04-28 | 2018-01-02 | MAGNETI MARELLI S.p.A. | Fuel pump for a direct injection system with a better hydraulic sealing of the intake valve |
Also Published As
Publication number | Publication date |
---|---|
EP0925445B1 (de) | 2003-09-10 |
JP2001506343A (ja) | 2001-05-15 |
EP0925445A1 (de) | 1999-06-30 |
WO1999002857A3 (de) | 1999-04-01 |
US6238189B1 (en) | 2001-05-29 |
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