Fuel pump, in particular for an internal combustion engine with direct injection
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02M-037/04
F04B-053/10
출원번호
US-0419237
(2003-04-21)
우선권정보
DE-0020281 (2002-05-07)
발명자
/ 주소
Hess, Manfred
출원인 / 주소
Robert Bosch GmbH
인용정보
피인용 횟수 :
2인용 특허 :
7
초록▼
A fuel pump for use in a fuel injection system includes a housing at least one piston defining a work chamber and drive means which put the piston into a reciprocating motion in the chamber. An inlet conduit and an outlet conduit can be made to communicate with the work chamber. A first valve device
A fuel pump for use in a fuel injection system includes a housing at least one piston defining a work chamber and drive means which put the piston into a reciprocating motion in the chamber. An inlet conduit and an outlet conduit can be made to communicate with the work chamber. A first valve device is provided between the inlet conduit and the work chamber, and a second valve device is provided between the work chamber and the outlet conduit. The valve element of one valve device has a guide portion, which is received in a guide opening embodied in the valve element of the other valve device, and the circumferential face of the guide portion and/or of the guide opening has at least one recess, by which the contact area between the guide portion and the guide opening is reduced.
대표청구항▼
1. A fuel pump (22), in particular for an internal combustion engine (12) with direct injection, the pump comprisinga housing (38), at least one piston (40) which is received in the housing (38), drive means (42), which put the piston (40) into a reciprocating motion, a work chamber (44) which is de
1. A fuel pump (22), in particular for an internal combustion engine (12) with direct injection, the pump comprisinga housing (38), at least one piston (40) which is received in the housing (38), drive means (42), which put the piston (40) into a reciprocating motion, a work chamber (44) which is defined in some regions by the piston (40), an inlet conduit (48) and an outlet conduit (50), each of which can be made to communicate with the work chamber (44), a first valve device (64) between the work chamber (44) and the inlet conduit (48) a second valve device (74) between the work chamber (44) and the outlet conduit (50), each valve device (64, 74) having a movable valve element the movable valve element (62) of one valve device (64) having a guide portion (60), which is received at least in some regions in a guide opening (58), embodied in the movable valve element (72) of the other valve device (74), and the circumferential face of the guide portion (60) and/or of the guide opening having at least one recess (88), by means of which the contact area between the guide portion (60) and the guide opening (58) is reduced. 2. The fuel pump (22) of claim 1, further comprising a connecting conduit (94, 96) which connects the guide opening (58) with the work chamber (44).3. A fuel pump (22), in particular for an internal combustion engine (12) with direct injection, the pump comprisinga housing (38), at least one piston (40) received in the housing (38), drive means (42), which put the piston (40) into a reciprocating motion, a work chamber (44) which is defined in some regions by the piston (40), an inlet conduit (48) and an outlet conduit (50), each of which can be made to communicate with the work chamber (44), a first valve device (64) between the work chamber (44) and the inlet conduit (48) a second valve device (74) between the work chamber (44) and the outlet conduit (50), each valve device (64, 74) having a movable valve element, the movable valve element (62) of one valve device (64) having a guide portion (60), which is received in a guide opening (58), the guide portion (60) being embodied on the valve element (62) of the first valve device (64), and the guide opening (58) being embodied in the inlet conduit (48). 4. The fuel pump (22) of claim 3, wherein the circumferential face of the guide portion (60) and/or of the guide opening comprises at least one longitudinally extending recess (88), by which the contact area between the guide portion (60) and the guide opening (58) is reduced and which acts as a flow conduit when the valve device (64) is open.5. The fuel pump (22) of claim 1, comprising a plurality of said recesses (88).6. The fuel pump (22) of claim 2, comprising a plurality of said recesses (88).7. The fuel pump (22) of claim 4, comprising a plurality of said recesses (88).8. The fuel pump (22) of claim 1, wherein said at least one recess (88) is embodied such that between the guide portion (60) and the guide opening (58), only an essentially linear contact exists.9. The fuel pump (22) of claim 2, wherein said at least one recess (88) is embodied such that between the guide portion (60) and the guide opening (58), only an essentially linear contact exists.10. The fuel pump (22) of claim 4, wherein said at least one recess (88) is embodied such that between the guide portion (60) and the guide opening (58), only an essentially linear contact exists.11. The fuel pump (22) of claim 5, wherein said at least one recess (88) is embodied such that between the guide portion (60) and the guide opening (58), only an essentially linear contact exists.12. The fuel pump (22) of claim 1, wherein the guide portion (60) is embodied such that it includes at least three radially extending vanes (86), which are distributed over the circumference.13. The fuel pump (22) of claim 2, wherein the guide portion (60) is embodied such that it includes at least three radially extending vanes (86), which are distributed over the circumference.14. The fuel pump (22) of claim 5, wherein the guide portion (60) is embodied such that it includes at least three radially extending vanes (86), which are distributed over the circumference, and wherein said plurality of recesses are embodied such that the guide opening (58) is embodied such that it includes at least three radially extending ribs (86), which are preferably distributed over the circumference.15. The fuel pump (22) of claim 1, the guide opening (58) is embodied such that it includes at least three radially extending ribs (86), which are distributed over the circumference.16. The fuel pump (22) of claim 2, the guide opening (58) is embodied such that it includes at least three radially extending ribs (86), which are distributed over the circumference.17. The fuel pump (22) of claim 12, wherein the vanes (86) are ground hollow.18. The fuel pump (22) of claim 15, wherein the vanes (86) are ground hollow.19. The fuel pump (22) of claim 1, wherein the valve element (62) of the first valve device (64) is braced on the valve element (72) of the second valve device (74) via a clamping element (80) in such a way that it is pressed against the associated seat.20. The fuel pump (22) of claim 19, wherein the first valve element (62) comprises a plate-shaped support portion, preferably a disk (82), on which the clamping element (80) is braced.
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이 특허에 인용된 특허 (7)
Kawamura Kazuya (Higashimatsuyama JPX), Constant pressure type delivery valve for fuel injection pump.
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