EP1704327A1 - Kraftstoffhochdruckpumpe für common-rail-einspritzsysteme - Google Patents
Kraftstoffhochdruckpumpe für common-rail-einspritzsystemeInfo
- Publication number
- EP1704327A1 EP1704327A1 EP04766829A EP04766829A EP1704327A1 EP 1704327 A1 EP1704327 A1 EP 1704327A1 EP 04766829 A EP04766829 A EP 04766829A EP 04766829 A EP04766829 A EP 04766829A EP 1704327 A1 EP1704327 A1 EP 1704327A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump housing
- shaped container
- pressure
- pump
- opening
- 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
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/121—Casings
-
- 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
Definitions
- the invention relates to a high-pressure fuel pump for common-rail injection systems with a high-pressure accumulator integrated in the high-pressure fuel pump.
- High-pressure fuel pumps for common rail injection systems are generally designed as radial piston pumps. From DE 102 285 51.9 of the applicant, a radial piston high pressure pump for common rail injection systems with a high pressure accumulator integrated in the radial piston high pressure pump is already known.
- the radial piston high-pressure pump has a housing in which a drive shaft is guided.
- the drive shaft has an eccentric section on which a cam ring is mounted.
- a plurality of pump pistons are preferably supported on the cam ring and are radially longitudinally movable in the pump body with respect to the drive shaft.
- a suction valve and a pressure valve are assigned to each pump piston. Fuel is fed into the pump piston from the low-pressure area via the suction valve.
- the compressed fuel is discharged via the pressure valve and fed to the common high-pressure accumulator (common rail) via a high-pressure line.
- the high-pressure accumulator is integrated in a peripheral area of the high-pressure fuel pump.
- the high-pressure accumulator is integrated in the pump, it is difficult to adapt the high-pressure pump to different engine types.
- An individual high- pressure fuel pump must therefore be designed and manufactured for each engine type. The subsequent adjustment of the high pressure fuel Storage to the circumstances is hardly possible, or only with considerable effort.
- the object of the invention is therefore to provide a high-pressure fuel pump for common-rail injection systems with a high-pressure accumulator integrated in the high-pressure radial piston pump, the high-pressure accumulator volume of which can be changed in a simple and inexpensive manner and which is inexpensive to manufacture.
- the invention is characterized in that the high-pressure accumulator is formed by an opening made in the pump housing and a pot-shaped container arranged in the opening.
- the manufacture of such a high-pressure accumulator is particularly simple and inexpensive.
- the high-pressure storage volume can be changed simply and inexpensively in such a construction, in which only a pot-shaped container with a different high-pressure storage volume is used.
- the high-pressure pump can thus be quickly, easily and inexpensively adapted to the respective requirements. It is not necessary to change the pump itself. It is not even necessary to disassemble the pump for retrofitting.
- a preferred embodiment of the invention provides that the opening in the pump housing and the pot-shaped container are cylindrical. Due to the cylindrical shape
- the components can be manufactured in a particularly simple manner, for example by drilling or turning.
- a particularly advantageous embodiment of the invention provides that the opening in the pump housing has an internal thread and the cup-shaped container has an external thread corresponding to the internal thread.
- the cup-shaped container can be screwed into the pump housing in a simple manner. This considerably simplifies assembly, which means further cost savings are possible.
- a further advantageous embodiment of the invention provides that the opening in the pump housing has an internal thread and that a screw sleeve can be screwed into the internal thread, which lies against a collar of the pot-shaped container and which fixes the container in the pump housing.
- the screw sleeve When screwing into the pump housing, the screw sleeve carries out both an axial movement and a rotary movement about its axis.
- the cup-shaped container is only pressed into the pump housing in the axial direction by the screw sleeve.
- sealing surfaces formed on the cup-shaped container are not rotated when screwing in on a corresponding sealing surface of the pump housing, but rather are only pressed thereon in the axial direction, as a result of which the sealing surfaces can be damaged less quickly.
- a further advantageous embodiment of the invention provides that a relief groove is formed in the cylindrical opening in the pump housing and / or on an outer lateral surface of the pot-shaped container or the lateral surface of the screw sleeve, via which a relief groove may be provided between the pump housing and the pot-shaped container. leakage current escaping from the screw sleeve can be dissipated.
- the relief groove is preferably connected to the tank or the suction side of the pump via a discharge line.
- FIG. 1 shows the basic structure of a radial piston high-pressure pump with a high-pressure accumulator integrated in the high-pressure pump
- FIG. 2 shows a first exemplary embodiment of a high-pressure accumulator as can be used in a radial piston high-pressure pump according to FIG. 1,
- Figure 3 shows a second embodiment of a high pressure accumulator as it can be used in a high pressure pump according to Figure 1, and
- FIG. 4 shows a third exemplary embodiment of a high-pressure accumulator as can be used in a radial piston high-pressure pump according to FIG. 1,
- FIG. 1 shows a first embodiment of the high pressure fuel pump.
- the high-pressure fuel pump is designed as a radial piston pump and has a pump housing 1 in which a drive shaft 2 is rotatably mounted.
- the drive shaft 2 is designed as an eccentric shaft.
- Three pump pistons 18 are preferably arranged on the outer circumference of the eccentric 17 at an angle and 120 degrees to one another.
- each pump piston 18 performs a complete suction and compression stroke by.
- the cylinder piston 18 moves in the direction of the drive shaft 2 and fuel is supplied to the cylinder space via a sucking valve (not shown in FIG. 1).
- the direction of movement is reversed and the compression stroke begins.
- the suction valve closes and the fuel is subsequently compressed to a pressure of up to 1800 bar during the art movement of the pump piston 18.
- the pressure valve 19 opens and the compressed fuel flows from the cylinder space, via a high-pressure line 20, to the common high-pressure accumulator 4.
- the high-pressure accumulator is opened by an opening 5 in the pump housing 1 and one arranged in the opening 5, pot-shaped container 6 is formed.
- the opening 5 can be introduced in a simple manner by machining, for example by drilling or turning.
- the high-pressure accumulator volume is adapted to different engine types by exchanging the cup-shaped container 6. Special configurations of the high-pressure accumulator 4 are shown in more detail below in FIGS. 2 to 4.
- FIG. 2 shows a first exemplary embodiment of a high-pressure fuel accumulator 4 as it can be embodied in a high-pressure fuel pump according to FIG. 1.
- the high-pressure fuel accumulator 4 is formed by an opening 5 made in the pump housing 1 and a cup-shaped container 6 arranged in the opening 5.
- the opening 5 in the pump housing 1 has an internal thread 7.
- the cup-shaped container 6 has a corresponding external thread 8 on its lateral surface.
- the pot-shaped container 6 can be inserted into the pump housing 1 in a particularly simple manner be screwed in.
- a key extension 21 is formed on the pot-shaped container 4.
- the open end face 13 of the cup-shaped container is designed as a flat sealing surface.
- the sealing surface presses against a corresponding sealing surface 14 in the pump housing 1. This seals the high-pressure accumulator 4.
- An annular relief groove 12 is provided to prevent a possible leakage current from escaping through the thread.
- the relief groove 12 is formed in the lateral surface of the opening 5. Alternatively or additionally, a relief groove can also be formed in the outer lateral surface of the pot-shaped container 6. The leakage flow from the relief groove 12, via a discharge line, not shown, back into the fuel tank or on the suction side of the high-pressure fuel pump. This ensures that no fuel can get into the environment.
- the high-pressure accumulator 4 is connected to the high-pressure side of the high-pressure fuel pump via a connecting line 22.
- the connecting line 22 opens axially in the opening 5 of the high-pressure accumulator 4.
- the connecting line 22 can be drilled with the opening 5 in one working step without the pump housing 1 having to be reclamped.
- the connecting line 22 can also open into the lateral surface of the opening 5, the pressure accumulator 4.
- the high-pressure connections 23 can be connected to lines which connect the high-pressure accumulator 4 to the injectors of an internal combustion engine. It is possible that the fuel pressure pump branches only a high pressure connection 23 and the distribution of the fuel takes place via a fuel distributor arranged outside the pump. Or a number of high-pressure connections 23 corresponding to the number of injectors is already formed on the pump housing 1, so that the individual lines can be routed directly from the pump to the individual injectors.
- FIG. 3 shows a second exemplary embodiment of a high-pressure accumulator 4 as it is in a high-pressure pump according to FIG.
- the high-pressure accumulator 4 essentially corresponds to the high-pressure accumulator as already shown in FIG.
- the jacket surface 11 of the pot-shaped container 6, in the region of the open end face 13, has an outer cone 15 which is pressed against a corresponding conical surface 16 formed in the opening 5 of the pump housing 1.
- the conical surfaces 15, 16 serve to seal the high-pressure accumulator 4.
- the conical design of the sealing surfaces results in a particularly secure seal. It is particularly advantageous if the pot-shaped container 6 has a reduced wall thickness in the area of the outer cone 15. This creates a slightly elastic outer cone 15 to be deformed, which also ensures a secure seal when the screw connection is set.
- FIG. 4 shows a third exemplary embodiment of a high-pressure accumulator 4 as can be used in the high-pressure fuel pump according to FIG. 1.
- the exemplary embodiment essentially speaks of the exemplary embodiment in FIG. 3, to the description of which reference is made here.
- the high-pressure accumulator 4 still has an additional screw sleeve 9, which is arranged between the pump housing 1 and the cup-shaped container 6.
- the screw sleeve 9 is screwed into the opening 5 in the pump housing 1.
- the tightening force of the screw is transmitted to the cup-shaped container 6 via a collar 10 formed in the cup-shaped container.
- the outer cone 15 formed in the jacket surface of the pot-shaped container 6 is pressed against the corresponding conical surface 16 formed in the opening 5 of the pump housing 1.
- the screw sleeve offers the advantage that when the connection is tightened, only the screw sleeve 9 rotates.
- the conical surfaces 15, 16, however, are pressed against each other only in the axial direction. This does not easily damage the conical surfaces and thus damage the sealing of the high-pressure accumulator.
- the screw sleeve can be used both for a flat, end-side seal, as shown in FIG. 2, and for a seal via the conical sealing surfaces according to FIGS. 3 and 4.
- the invention is thus characterized in that the high-pressure accumulator 4 is formed in a particularly simple manner by an opening 5 made in the pump housing 1 and a cup-shaped container 6 arranged in the opening 5.
- the opening 5 can be introduced into the pump housing 1 by simple and inexpensive exciting machining, for example by drilling or turning.
- the storage volume of the high-pressure accumulator 4 can be easily Exchange of the pot-shaped container 6 adaptable to different applications.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2003160534 DE10360534B4 (de) | 2003-12-22 | 2003-12-22 | Kraftstoffhochdruckpumpe für Common-Rail-Einspritzsysteme |
PCT/EP2004/052252 WO2005061890A1 (de) | 2003-12-22 | 2004-09-21 | Kraftstoffhochdruckpumpe für common-rail-einspritzsysteme |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1704327A1 true EP1704327A1 (de) | 2006-09-27 |
EP1704327B1 EP1704327B1 (de) | 2007-07-18 |
Family
ID=34683764
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04766829A Not-in-force EP1704327B1 (de) | 2003-12-22 | 2004-09-21 | Kraftstoffhochdruckpumpe für common-rail-einspritzsysteme |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1704327B1 (de) |
DE (2) | DE10360534B4 (de) |
WO (1) | WO2005061890A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010001252A1 (de) * | 2010-01-27 | 2011-07-28 | Robert Bosch GmbH, 70469 | Kraftstoffeinspritzsystem mit integriertem Hochdruckspeicher an einem Zylinderkopf |
DE102010002291A1 (de) * | 2010-02-24 | 2011-08-25 | Robert Bosch GmbH, 70469 | Hochdruckpumpe und Hochdruckspeicher |
DE102018215132A1 (de) * | 2018-09-06 | 2020-03-12 | Ford Global Technologies, Llc | Hochdruckpumpe für eine Treibstoffzufuhr eines Verbrennungsmotors |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19747736C1 (de) * | 1997-10-29 | 1999-04-08 | Siemens Ag | Druckspeicher für Kraftstoffversorgungssysteme |
JP2001020830A (ja) * | 1999-07-09 | 2001-01-23 | Usui Internatl Ind Co Ltd | ディーゼル機関用高圧燃料噴射管 |
DE10118884A1 (de) * | 2001-04-18 | 2002-11-07 | Bosch Gmbh Robert | Hochdruck-Kraftstoffpumpe für ein Kraftstoffsystem einer direkteinspritzenden Brennkraftmaschine, Kraftstoffsystem sowie Brennkraftmaschine |
JP2002371941A (ja) * | 2001-06-18 | 2002-12-26 | Denso Corp | 燃料噴射ポンプ |
DE10129449A1 (de) * | 2001-06-19 | 2003-01-02 | Bosch Gmbh Robert | Kraftstoffhochdruckpumpe für Brennkraftmaschine mit verbessertem Teillastverhalten |
ITTO20010968A1 (it) * | 2001-10-12 | 2003-04-12 | C R F Societa Con Sortile Per | Dispositivo di collegamento a tenuta di un raccordo su un iniettore di combustibile per motori endotermici. |
DE10154645A1 (de) * | 2001-11-07 | 2003-06-12 | Siemens Ag | Verfahren zum Herstellen einer Kraftstoffspeicherleitung mit einem vorgespannten Anschlussstück |
DE10228551A1 (de) * | 2002-06-26 | 2004-01-22 | Siemens Ag | Radialkolbenpumpe |
-
2003
- 2003-12-22 DE DE2003160534 patent/DE10360534B4/de not_active Expired - Fee Related
-
2004
- 2004-09-21 EP EP04766829A patent/EP1704327B1/de not_active Not-in-force
- 2004-09-21 DE DE502004004401T patent/DE502004004401D1/de active Active
- 2004-09-21 WO PCT/EP2004/052252 patent/WO2005061890A1/de active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO2005061890A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1704327B1 (de) | 2007-07-18 |
DE502004004401D1 (de) | 2007-08-30 |
DE10360534A1 (de) | 2005-07-21 |
WO2005061890A1 (de) | 2005-07-07 |
DE10360534B4 (de) | 2007-06-06 |
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