Pump element and piston pump for generating high fuel pressure
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F04B-001/04
F04B-001/00
F01B-001/00
출원번호
US-0450175
(2002-07-27)
등록번호
US-7384246
(2008-06-10)
우선권정보
DE-101 50 351(2001-10-15)
국제출원번호
PCT/DE02/002780
(2002-07-27)
§371/§102 date
20031119
(20031119)
국제공개번호
WO03/042534
(2003-05-22)
발명자
/ 주소
Diaferia,Antonio
Putignano,Giuseppe
Polito,Stefano
Ranaldo,Sandra
출원인 / 주소
Robert Bosch GmbH
대리인 / 주소
Greigg,Ronald E.
인용정보
피인용 횟수 :
2인용 특허 :
10
초록
A pump element and a piston pump for generating high fuel pressure are proposed, in which tilting of the piston base relative to a drive shaft is effectively suppressed, so that the service life of the high-pressure fuel pump is increased.
대표청구항▼
The invention claimed is: 1. In a pump element for a piston pump (3) for generating high fuel pressure in fuel injection systems of internal combustion engines, with at least one piston (11), disposed in a cylinder bore (9), the piston (11) having a piston base (15) and a piston shaft (13), and wit
The invention claimed is: 1. In a pump element for a piston pump (3) for generating high fuel pressure in fuel injection systems of internal combustion engines, with at least one piston (11), disposed in a cylinder bore (9), the piston (11) having a piston base (15) and a piston shaft (13), and with a plate (17), mounted on the piston base (15), for transmitting the pumping motion from a drive mechanism (5) to the piston (11), the piston base (15) having a bearing face (29) cooperating with an indentation (31) in the plate (17), the improvement wherein the bearing face (29) protrudes into the indentation (31) and rests on a bottom surface (33) of the indentation (31), the indentation (31) in the plate (17) being dimensioned such that the piston base (15) fits precisely into the indentation (31), and wherein the bearing face (29) and the bottom surface (33) of the indentation (31) form an essentially plane contact zone and the area of the essentially plane contact zone is larger than or equal to the cross-sectional area of the piston shaft (13). 2. The pump element of claim 1, wherein the bearing face (29) or the face (33) of the indentation that together with the bearing face (29) forms the contact zone has a radius greater than 20�� the diameter of the piston shaft (13). 3. The pump element of claim 1, wherein the piston base (15) and the plate (17) are joined together by positive engagement by means of a plate holder (35). 4. The pump element of claim 2, wherein the piston base (15) and the plate (17) are joined together by positive engagement by means of a plate holder (35). 5. The pump element of claim 3, wherein the piston base (15) comprises a collar (43), and wherein the plate holder (35) is joined to the piston (11) via the collar (43). 6. The pump element of claim 3, wherein the piston base (15) comprises a groove (25) with a snap ring (27), and wherein the plate holder (35) is braced on the snap ring (27). 7. The pump element of claim 3, wherein the plate holder (35) is joined to the plate (17) by creative forming, in particular by crimping or folding. 8. The pump element of claim 5, wherein the plate holder (35) is joined to the plate (17) by creative forming, in particular by crimping or folding. 9. The pump element of claim 6, wherein the plate holder (35) is joined to the plate (17) by creative forming, in particular by crimping or folding. 10. The pump element of claim 3, wherein the plate (17), on its circumference on the side toward the piston (11), has a chamfer. 11. The pump element of claim 3, wherein the plate (17) comprises a collar (41), and wherein the plate holder (35) surrounds the collar (41). 12. The pump element of claim 1, wherein the drive element comprises a polygonal ring (19), and wherein the plate (17), comprises a chamfer (40) on its bearing face oriented toward the polygonal ring (19). 13. The pump element of claim 6, comprising a crimped edge (45) embodied on the plate (17), and wherein the crimped edge (45) engages the groove (25) of the piston (11) or surrounds the collar (43) of the piston (11). 14. A piston pump for generating high fuel pressure in fuel injection systems of internal combustion engines, in particular in a common rail injection system, comprising at east one pump element (1), as defined in claim 1. 15. The piston pump of claim 14, wherein the piston pump is embodied as a radial piston pump. 16. The piston pump of claim 14, wherein the piston pump is embodied as a radial piston pump comprising a drive shaft (5) supported in a pump housing (7), which shaft is embodied eccentrically, preferably a plurality of pump elements (1) disposed radially relative to the drive shaft (5), the pistons (11) being movable radially back and forth in the respective cylinder chamber by rotation of the drive shaft (5), and a ring (27) with flat faces (21) disposed between the drive shaft and the plate (17). 17. The piston pump of claim 14, wherein the piston pump is embodied as a distributor pump or inline pump. 18. In a pump element for a piston pump (3) for generating high fuel pressure in fuel injection systems of internal combustion engines, with at least one piston (11), disposed in a cylinder bore (9), the piston (11) having a piston base (15) and a piston shaft (13), and with a plate (17), mounted on the piston base (15), for transmitting the pumping motion from a drive mechanism (5) to the piston (11), the piston base (15) having a bearing face (29) cooperating with an indentation (31) in the plate (17), the improvement wherein the piston base (15) has a diameter larger than the diameter of the piston shaft (13), and the indentation (31) in the plate (17) is dimensioned such that the piston base (15) fits precisely into the indentation (31), and wherein the bearing face (29) and the indentation (31) form an essentially plane contact zone and the area of the essentially plane contact zone is larger than or equal to the cross-sectional area of the piston shaft (13). 19. The pump element of claim 18, wherein the bearing face (29) or the face (33) of the indentation that together with the bearing face (29) forms the contact zone has a radius greater than 20�� the diameter of the piston shaft (13). 20. The pump element of claim 18, wherein the piston base (15) and the plate (17) are joined together by positive engagement by means of a plate holder (35). 21. The pump element of claim 19, wherein the piston base (15) and the plate (17) are joined together by positive engagement by means of a plate holder (35). 22. The pump element of claim 20, wherein the piston base (15) comprises a collar (43), and wherein the plate holder (35) is joined to the piston (11) via the collar (43). 23. The pump element of claim 20, wherein the piston base (15) comprises a groove (25) with a snap ring (27), and wherein the plate holder (35) is braced on the snap ring (27). 24. The pump element of claim 20, wherein the plate holder (35) is joined to the plate (17) by creative forming, in particular by crimping or folding. 25. The pump element of claim 22, wherein the plate holder (35) is joined to the plate (17) by creative forming, in particular by crimping or folding. 26. The pump element of claim 23, wherein the plate holder (35) is joined to the plate (17) by creative forming, in particular by crimping or folding. 27. The pump element of claim 20, wherein the plate (17), on its circumference on the side toward the piston (11), has a chamfer. 28. The pump element of claim 20, wherein the plate (17) comprises a collar (41), and wherein the plate holder (35) surrounds the collar (41). 29. The pump element of claim 18, wherein the drive element comprises a polygonal ring (19), and wherein the plate (17), comprises a chamfer (40) on its bearing face oriented toward the polygonal ring (19). 30. The pump element of claim 23, comprising a crimped edge (45) embodied on the plate (17), and wherein the crimped edge (45) engages the groove (25) of the piston (11) or surrounds the collar (43) of the piston (11). 31. A piston pump for generating high fuel pressure in fuel injection systems of internal combustion engines, in particular in a common rail injection system, comprising at least one pump element (1), as defined in claim 18. 32. The piston pump of claim 31, wherein the piston pump is embodied as a radial piston pump. 33. The piston pump of claim 31, wherein the piston pump is embodied as a radial piston pump comprising a drive shaft (5) supported in a pump housing (7), which shaft is embodied eccentrically, preferably a plurality of pump elements (1) disposed radially relative to the drive shaft (5), the pistons (11) being movable radially back and forth in the respective cylinder chamber by rotation of the drive shaft (5), and a ring (27) with flat faces (21) disposed between the drive shaft and the plate (17). 34. The piston pump of claim 31, wherein the piston pump is embodied as a distributor pump or in-line pump.
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