EP2167818A1 - Kraftstoffhochdruckpumpe mit rollenstössel - Google Patents
Kraftstoffhochdruckpumpe mit rollenstösselInfo
- Publication number
- EP2167818A1 EP2167818A1 EP08774082A EP08774082A EP2167818A1 EP 2167818 A1 EP2167818 A1 EP 2167818A1 EP 08774082 A EP08774082 A EP 08774082A EP 08774082 A EP08774082 A EP 08774082A EP 2167818 A1 EP2167818 A1 EP 2167818A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plunger
- radial piston
- drive shaft
- piston pump
- 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
- 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
- F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
- F04B1/043—Hydraulic arrangements
-
- 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
- F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
-
- 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
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
- F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
- F04B9/042—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being cams
Definitions
- the invention relates to a radial piston pump for high-pressure fuel generation 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 supports at least one piston arranged radially in a respective element bore with respect to the drive shaft Rotating the drive shaft in the respective element bore in the radial direction are movable back and forth, each with a arranged between the piston and the drive shaft and guided in the pump housing roller tappet.
- Such a radial piston pump is known for example from DE 103 56 262 Al.
- the plunger and the pump housing each delimit a plunger space within which, inter alia, there is a respective spring which holds the plunger in contact with the drive shaft or camshaft. Since the plungers join the oscillating movement of the pistons of the radial piston pump, the volume of the plunger chambers changes periodically.
- a roller is slidably mounted in the plunger, wherein the roller rolls on the cam of the drive shaft.
- Disclosure of the invention is based on the object to further improve such a radial piston pump in terms of life, reliability, wear and efficiency.
- High-pressure fuel generation in particular in a common rail injection system, with a mounted in a pump housing drive shaft with at least one with respect to the drive shaft radially arranged in each case an element bore piston, said at least one piston by turning the drive shaft in the element bore in the radial direction and can be moved, with a arranged between the piston and the drive shaft and guided in the pump housing plunger, each with a limited by the plungers and the pump housing plunger space, wherein the plunger space is hydraulically in communication with an engine room, wherein at one of the drive shaft facing the end of the plunger a recess for receiving a roller is provided, achieved in that at least a part of the hydraulic connection between plunger space and the engine room opens into the recess.
- the flow resistance of the plunger is reduced in the guide bore by the additional hydraulic connection, which reduces the dissipation caused by the plunger movement.
- the fuel is heated less and increases the efficiency of the pump.
- Engine room and ram space is that the production costs are low and they can also be retrofitted to already manufactured in series high-pressure fuel pumps without further notice. For this it is only necessary to modify the plunger. All other components can be taken over unchanged.
- a particularly advantageous embodiment of the invention provides that the plunger has at least one groove, but preferably a groove at both ends of the recess, wherein the groove extends substantially in the axial direction of the plunger.
- At least one connecting bore is provided in the pump housing, and that the at least one Connecting bore two ram spaces hydraulic interconnects.
- Connecting bore and the hydraulic connection according to the invention can be limited by the hydraulic amount of fuel delivered according to the invention to the necessary extent, so that the pumping work of the plunger is reduced to the necessary level.
- two plunger chambers can be hydraulically connected by an external connection line. This variant is recommended if, for structural or other reasons, a connection bore in the pump housing can not be accommodated.
- the function of the radial piston pump according to the invention can be further improved if the already existing supply of the drive shaft with fuel for cooling and lubrication opens into the hydraulic connection between two plunger chambers, since in this case a defined amount of lubricant for lubrication and cooling purposes the plungers and the Tappet spaces can be supplied. Thereby increases the load capacity of the radial piston pump according to the invention, without additional manufacturing or manufacturing costs.
- Camshaft or be designed as an eccentric shaft. It is also possible to provide the plungers with a roller which roll on the camshaft so that the frictional forces between the plunger and the camshaft are reduced.
- Figure 2 is an enlarged view of a roller tappet according to the invention.
- FIG. 1 shows schematically a radial piston pump for
- the radial piston pump shown in Figure 1 is equipped with an integrated demand quantity control.
- the flow rate control is carried out on the low pressure side via a metering unit ZME.
- the radial piston pump shown in Figure 1 comprises a mounted in a pump housing 1 drive shaft 2 with two offset by 180 ° seconded cam 36. against the cam 36, two pistons 8 are supported.
- the pistons 8 are each received in an element bore 11 in the radial direction movable back and forth.
- the pistons 8 are arranged at an angle of about 90 ° to each other and limit at its end remote from the drive shaft 2 a delivery chamber (not shown), the
- a plate 14 is provided on the piston 8. These plates 14 may be either integral with the piston 8 or removably attached thereto.
- a spring 17 is biased. The springs 17 press the pistons 8 against the bottoms 20 of the plungers 23.
- From the bottoms 20 of the plungers 23 extends a cylindrical guide body 26 in the direction of the delivery chambers, not shown. The guide body 26 are part of the plunger 23 and prevent tilting of the plunger 23 in a guide bore 29.
- the plunger 23 are slidable in the pump housing 1.
- a semicircular recess 27 is provided which serves to support a roller 28.
- the recess 27 and the roller 28 form a sliding bearing, while the roller 28 rolls on the cam 36 of the drive shaft 2.
- the roller 28 i, guide body 26 is fixed. In this case, a relative movement between the end faces of the roller 28 and the guide body 26 takes place, which can cause wear.
- radial piston pump serves to pressurize fuel, which is supplied from a Vor fundamentalpumpe from a tank with high pressure.
- the pistons 8 are moved away from the axis of rotation of the drive shaft camshaft 2 as a result of the eccentric movement of the cams 36 of the drive shaft 2.
- the pistons 8 move radially toward the axis of the camshaft 2 in order to suck fuel into the delivery chamber (not shown).
- the plunger 23 is shown in a longitudinal section and in Figure 2 b) in a side view. From the longitudinal section (FIG. 2 a), it can be clearly seen that the base 20 is inserted into the guide body 26 in the illustrated embodiment becomes. To make a positive connection between the bottom 20 and guide body 26, a Seeger ring 30 may be provided.
- the roller 28 is rounded at its end faces and is fixed in the lateral direction by the guide body 26. Due to the oscillating movement of the plunger 23 in the guide bore 29, the end faces of the roller 28 rotate on the inside of the guide body 26.
- a hydraulic connection between the plunger chambers 32, 33 on the one hand and the recess 28 is provided according to the invention . Furthermore, the hydraulic connection according to the invention improves the tribological relationships between roller 28 and plunger 23.
- FIG. 2 a shows two variants of hydraulic connections according to the invention.
- a groove 53 is shown, which supplies the contact point between the roller 28 and the guide body 26 with fuel.
- an alternative embodiment of the hydraulic connection according to the invention in the form of a bore 55 is shown, which supplies the contact point between the roller 28 and the guide body 26 with fuel.
- the groove 53 and the bore 55 are alternative embodiments of the invention. Which of these
- the plunger 23 is driven by the cam 36 of the drive shaft, it performs an oscillating movement, which is indicated in Figure 2a by a double arrow, from. Since there is fuel in both the plunger chambers 32, 33 and in the engine compartment 35, the oscillating movement of the plunger 23 causes fuel to be conveyed from the engine compartment 35 into the plunger chambers 32 and 33 when the piston in FIG moved down to the top. As soon as the plunger 23 moves from the bottom to the top, the flow direction is reversed and fuel from the plunger chambers 32, 33 is conveyed into the engine compartment 35.
- the volume changes in the plunger chambers 32 and 33 are phase-shifted by 90 °.
- This phase shift can be exploited by providing a communication bore 37 between the plunger spaces 32 and 33 such that whenever the volume of a plunger space decreases, the fuel in that plunger space is partially ejected into the adjacent plunger space whose volume is the same Time is increasing. The other part of the fuel flows through the groove 53 or the bore 55 and the compensation bores 41 (if present) in the bottom 20 of the plungers 23 and 24.
- the lubrication of the camshaft 2 and its storage takes place via a lubricant supply 38 with a throttle 39, which directly with fuel from the fuel tank, not shown Internal combustion engine is fed via a supply line 40. From the supply line 40 branches off a line 43 which supplies the metering unit ZME of the radial piston pump with fuel.
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)
- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007034036A DE102007034036A1 (de) | 2007-07-20 | 2007-07-20 | Kraftstoffhochdruckpumpe mit Rollenstößel |
PCT/EP2008/057457 WO2009013068A1 (de) | 2007-07-20 | 2008-06-13 | Kraftstoffhochdruckpumpe mit rollenstössel |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2167818A1 true EP2167818A1 (de) | 2010-03-31 |
EP2167818B1 EP2167818B1 (de) | 2011-01-26 |
Family
ID=39777041
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08774082A Not-in-force EP2167818B1 (de) | 2007-07-20 | 2008-06-13 | Kraftstoffhochdruckpumpe mit rollenstössel |
Country Status (6)
Country | Link |
---|---|
US (1) | US20100170480A1 (de) |
EP (1) | EP2167818B1 (de) |
JP (1) | JP2010533818A (de) |
AT (1) | ATE497106T1 (de) |
DE (2) | DE102007034036A1 (de) |
WO (1) | WO2009013068A1 (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011003678A1 (de) * | 2011-02-07 | 2012-08-09 | Robert Bosch Gmbh | Hochdruckpumpe |
DE102011084486A1 (de) | 2011-10-14 | 2013-04-18 | Robert Bosch Gmbh | Stößelbaugruppe für eine Hochdruckpumpe |
JP2013155682A (ja) * | 2012-01-31 | 2013-08-15 | Denso Corp | 燃料供給ポンプおよび燃料供給装置 |
KR101349642B1 (ko) * | 2012-04-19 | 2014-01-10 | (주)모토닉 | 내연기관의 고압펌프 |
KR20140019539A (ko) * | 2012-08-06 | 2014-02-17 | 현대자동차주식회사 | 고압펌프용 롤러 구조 |
KR101371897B1 (ko) | 2012-09-05 | 2014-03-07 | 현대자동차주식회사 | 윤활성능이 개선된 고압연료펌프 |
KR20140037707A (ko) * | 2012-09-19 | 2014-03-27 | 현대자동차주식회사 | 고압연료펌프 |
CN102979732B (zh) * | 2012-10-30 | 2015-10-28 | 无锡鸿声铝业有限公司 | 真空旋转密封泵滚珠摩擦进油结构 |
DE102012223413A1 (de) * | 2012-12-17 | 2014-06-18 | Robert Bosch Gmbh | Rollenstößel für eine Pumpe, insbesondere Kraftstoffhochdruckpumpe, und Pumpe mit Rollenstößel |
GB201520698D0 (en) * | 2015-11-24 | 2016-01-06 | Delphi Internat Operations Luxembourg S À R L | Fuel Pump |
US10975816B2 (en) * | 2017-11-27 | 2021-04-13 | Stanadyne Llc | Roller drive mechanism for GDI pump |
Family Cites Families (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2965087A (en) * | 1958-01-29 | 1960-12-20 | Bosch Arma Corp | Fuel injection pump |
DE3447374A1 (de) * | 1984-12-24 | 1986-07-10 | Robert Bosch Gmbh, 7000 Stuttgart | Kraftstoffeinspritzpumpe fuer brennkraftmaschinen |
DE3724409A1 (de) * | 1986-10-31 | 1988-05-19 | Bosch Gmbh Robert | Kraftstoffeinspritzpumpe fuer brennkraftmaschinen |
EP0301222B1 (de) * | 1987-07-25 | 1992-05-06 | Robert Bosch Gmbh | Kraftstoffeinspritzpumpe für Brennkraftmaschinen |
US5058553A (en) * | 1988-11-24 | 1991-10-22 | Nippondenso Co., Ltd. | Variable-discharge high pressure pump |
JPH0571441A (ja) * | 1991-09-11 | 1993-03-23 | Nippondenso Co Ltd | 燃料噴射装置 |
JPH05180116A (ja) * | 1991-12-25 | 1993-07-20 | Nippondenso Co Ltd | 燃料噴射ポンプ |
CN1055745C (zh) | 1993-05-06 | 2000-08-23 | 卡明斯发动机公司 | 带有蓄压器的结构紧凑的高性能燃油*** |
AU6828294A (en) * | 1993-05-06 | 1994-12-12 | Cummins Engine Company Inc. | Distributor for a high pressure fuel system |
GB9701877D0 (en) * | 1997-01-30 | 1997-03-19 | Lucas Ind Plc | Fuel pump |
GB9815272D0 (en) | 1998-07-14 | 1998-09-09 | Lucas Ind Plc | Positive displacement pumps |
DE19907311A1 (de) * | 1999-02-22 | 2000-08-31 | Bosch Gmbh Robert | Hydraulikpumpeneinheit |
JP2001221131A (ja) * | 2000-02-07 | 2001-08-17 | Bosch Automotive Systems Corp | 噴射ポンプのタペット潤滑機構 |
JP2001263198A (ja) * | 2000-03-14 | 2001-09-26 | Bosch Automotive Systems Corp | 燃料ポンプ及びこれを用いた燃料供給装置 |
DE10161258A1 (de) * | 2001-12-13 | 2003-07-03 | Bosch Gmbh Robert | Kraftstoffhochdruckpumpe mit integrierter Sperrflügel-Vorförderpumpe |
JP3823819B2 (ja) * | 2001-12-18 | 2006-09-20 | 株式会社デンソー | 燃料噴射ポンプ |
DE10256418A1 (de) * | 2002-12-02 | 2004-06-09 | Abb Turbo Systems Ag | Abgasturbinengehäuse |
DE10307877A1 (de) * | 2003-02-25 | 2004-09-02 | Robert Bosch Gmbh | Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine |
EP1498600A1 (de) * | 2003-07-18 | 2005-01-19 | Delphi Technologies, Inc. | Common-Rail-Einspritzsystem |
DE10356262A1 (de) | 2003-12-03 | 2005-06-30 | Robert Bosch Gmbh | Radialkolbenpumpe, insbesondere für Kraftstoffeinspritzsysteme |
DE102004004705A1 (de) * | 2004-01-30 | 2005-08-18 | Robert Bosch Gmbh | Hochdruckpumpe, insbesondere für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine |
DE102004023541A1 (de) * | 2004-05-13 | 2005-12-01 | Robert Bosch Gmbh | Hochdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine |
DE102006045933A1 (de) * | 2006-09-28 | 2008-04-03 | Robert Bosch Gmbh | Stößelbaugruppe für eine Hochdruckpumpe und Hochdruckpumpe mit wenigstens einer Stößelbaugruppe |
US7610902B2 (en) * | 2007-09-07 | 2009-11-03 | Gm Global Technology Operations, Inc. | Low noise fuel injection pump |
-
2007
- 2007-07-20 DE DE102007034036A patent/DE102007034036A1/de not_active Withdrawn
-
2008
- 2008-06-13 AT AT08774082T patent/ATE497106T1/de active
- 2008-06-13 WO PCT/EP2008/057457 patent/WO2009013068A1/de active Application Filing
- 2008-06-13 US US12/663,671 patent/US20100170480A1/en not_active Abandoned
- 2008-06-13 EP EP08774082A patent/EP2167818B1/de not_active Not-in-force
- 2008-06-13 DE DE502008002488T patent/DE502008002488D1/de active Active
- 2008-06-13 JP JP2010517336A patent/JP2010533818A/ja active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO2009013068A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2167818B1 (de) | 2011-01-26 |
DE102007034036A1 (de) | 2009-01-22 |
WO2009013068A1 (de) | 2009-01-29 |
ATE497106T1 (de) | 2011-02-15 |
JP2010533818A (ja) | 2010-10-28 |
DE502008002488D1 (de) | 2011-03-10 |
US20100170480A1 (en) | 2010-07-08 |
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