EP0925445A1 - Radial piston pump for high-pressure fuel supply - Google Patents
Radial piston pump for high-pressure fuel supplyInfo
- Publication number
- EP0925445A1 EP0925445A1 EP98941253A EP98941253A EP0925445A1 EP 0925445 A1 EP0925445 A1 EP 0925445A1 EP 98941253 A EP98941253 A EP 98941253A EP 98941253 A EP98941253 A EP 98941253A EP 0925445 A1 EP0925445 A1 EP 0925445A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston pump
- radial piston
- drive shaft
- pressure
- pump according
- 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
- 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
- Components preferably have lapped contact surfaces.
- the lapping process creates a desired surface roughness while maintaining dimensional accuracy.
- 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.
- 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.
- 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.
- 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
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19729792 | 1997-07-11 | ||
DE19729792 | 1997-07-11 | ||
DE19814477 | 1998-04-01 | ||
DE19814477A DE19814477C2 (en) | 1997-07-11 | 1998-04-01 | Radial piston pump for high-pressure fuel supply |
PCT/DE1998/001790 WO1999002857A2 (en) | 1997-07-11 | 1998-06-30 | Radial piston pump for high-pressure fuel supply |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0925445A1 true EP0925445A1 (en) | 1999-06-30 |
EP0925445B1 EP0925445B1 (en) | 2003-09-10 |
Family
ID=26038229
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98941253A Expired - Lifetime EP0925445B1 (en) | 1997-07-11 | 1998-06-30 | Radial piston pump for high-pressure fuel supply |
Country Status (4)
Country | Link |
---|---|
US (1) | US6238189B1 (en) |
EP (1) | EP0925445B1 (en) |
JP (1) | JP2001506343A (en) |
WO (1) | WO1999002857A2 (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19744577A1 (en) * | 1997-10-09 | 1999-04-22 | Bosch Gmbh Robert | Radial piston pump for high pressure fuel supply in motor vehicles |
DE19848040A1 (en) * | 1998-10-17 | 2000-04-20 | Bosch Gmbh Robert | Radial piston pump for high fuel pressure in IC engines with common-rail injection systems has two plates engaging fully on each other, and second back pressure valve between first plate and pump housing |
DE19959006C1 (en) * | 1999-12-08 | 2000-12-21 | Bosch Gmbh Robert | Radial piston pump for common-rail fuel injection system for automobile engine has suction valve for one cylinder bore controlled in dependence on rotation angle of eccentric drive shaft |
JP2002371941A (en) * | 2001-06-18 | 2002-12-26 | Denso Corp | Fuel injection pump |
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 (en) * | 2006-04-11 | 2007-10-18 | Siemens Ag | Radial piston pump for fuel high pressure supply in an internal combustion engine |
DE102007050808A1 (en) * | 2007-10-24 | 2009-04-30 | Robert Bosch Gmbh | High pressure fuel pump |
CN102852751B (en) * | 2011-07-01 | 2016-03-16 | 德帕姆(杭州)泵业科技有限公司 | A kind of multi-plunger type high pressure reciprocating pump of vertical working |
CN103470416B (en) * | 2013-09-26 | 2016-08-17 | 南岳电控(衡阳)工业技术股份有限公司 | A kind of radial plunger oil feed pump being applied to high pressure common rail fuel injection system |
JP2016113897A (en) * | 2014-12-11 | 2016-06-23 | 株式会社小金井精機製作所 | Diesel pump |
JP6317701B2 (en) * | 2015-04-10 | 2018-04-25 | 株式会社デンソー | High pressure pump |
JP6829003B2 (en) * | 2015-04-28 | 2021-02-10 | マグネティ マレッリ ソチエタ ペル アツィオニ | Fuel pump for direct injection system with good hydraulic seal on inlet valve |
CN214304212U (en) * | 2021-03-09 | 2021-09-28 | 绿田机械股份有限公司 | Pump unit for miniature cleaning machine |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT212433Z2 (en) * | 1987-08-25 | 1989-07-04 | Weber Srl | RADIAL PISTON PUMP |
IT1218675B (en) * | 1987-08-25 | 1990-04-19 | Weber Srl | RADIAL PUMP PUMP IN PARTICULAR PUMP FOR INJECTION OF FUEL IN DIESEL CYCLE ENGINES |
US4957416A (en) * | 1989-09-11 | 1990-09-18 | Dresser-Rand Company | Gas compressor |
JP2759861B2 (en) * | 1992-10-02 | 1998-05-28 | 日清紡績株式会社 | Hydraulic pump |
US5382140A (en) * | 1993-02-11 | 1995-01-17 | Elasis Sistema Ricerca Fiat Nel Mezzogiorno | Radial-piston pump |
DE69919658T2 (en) * | 1998-05-26 | 2005-09-15 | Caterpillar Inc., Peoria | HYDRAULIC SYSTEM WITH A PUMP WITH A VARIABLE DELIVERY VOLUME |
-
1998
- 1998-06-30 JP JP50797899A patent/JP2001506343A/en not_active Ceased
- 1998-06-30 US US09/254,448 patent/US6238189B1/en not_active Expired - Fee Related
- 1998-06-30 WO PCT/DE1998/001790 patent/WO1999002857A2/en active IP Right Grant
- 1998-06-30 EP EP98941253A patent/EP0925445B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9902857A2 * |
Also Published As
Publication number | Publication date |
---|---|
EP0925445B1 (en) | 2003-09-10 |
WO1999002857A3 (en) | 1999-04-01 |
US6238189B1 (en) | 2001-05-29 |
WO1999002857A2 (en) | 1999-01-21 |
JP2001506343A (en) | 2001-05-15 |
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