초록

A high-pressure fuel pump with a pressure relief valve which has improved hydraulic properties and a reduced number of high-pressure sealing points.

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We claim: 1. A high-pressure fuel pump (30) having a delivery chamber (60) delimited on one side by a piston (62) of the high-pressure fuel pump (30), the delivery chamber (60) being connected on the intake side via an intake valve (34) to a low-pressure fuel line (22) and on the pressure side via

We claim: 1. A high-pressure fuel pump (30) having a delivery chamber (60) delimited on one side by a piston (62) of the high-pressure fuel pump (30), the delivery chamber (60) being connected on the intake side via an intake valve (34) to a low-pressure fuel line (22) and on the pressure side via a high-pressure connection (63) to a high-pressure fuel line (42), wherein a check valve (44) and a pressure relief valve (56), connected parallel to the check valve (44), are provided between the delivery chamber (60) that is contained in a housing (58) and the high-pressure connection (63) that is connected to the housing (58) in a fluid-tight manner, both the check valve (44) and the pressure relief valve (56) having a center line disposed at approximately 90�� to a center line of the piston (62), wherein the pressure relief valve (56) is contained in a blind hole bore (69) of the housing (58), and wherein the blind hole bore (69) starts from a chamber (68) delimited by the high-pressure connection (63) and the housing (58). 2. The high-pressure fuel pump according to claim 1, wherein the pressure relief valve comprises an inlet, an outlet and a valve element (74) that is prestressed in the direction of a valve seat (72), wherein the inlet is subjected to the pressure prevailing in the high-pressure fuel line (42), wherein starting at a particular pressure differential between the inlet and outlet, the valve element (74) connects the inlet and outlet hydraulically, and wherein the outlet of the pressure relief valve (56) is hydraulically connected to the delivery chamber (60) of the high-pressure pump (30). 3. The high-pressure fuel pump according to claim 1, wherein the pressure relief valve (56) is embodied in the form of a seat valve or a slide valve. 4. The high-pressure fuel pump according to claim 2, wherein the pressure relief valve (56) is embodied in the form of a seat valve or a slide valve. 5. The high-pressure fuel pump according to claim 1, wherein the pressure relief valve (56) comprises the housing (58) with a valve element (74), a valve seat (72) and a spring chamber (78), wherein the spring chamber (78) contains a spring (76) that rests against the housing (58) at one end and rests against the valve element (74) at the other end, wherein the spring chamber (78) is hydraulically connected to an outlet (70b), in that the valve seat (72) is disposed in a seat sleeve (102), and wherein the seat sleeve (102) is attached in the blind hole bore (69) of the housing (58). 6. The high-pressure fuel pump according to claim 2, wherein the pressure relief valve (56) comprises the housing (58) with the valve seat (72) and a spring chamber (78), wherein the spring chamber (78) contains a spring (76) that rests against the housing (58) at one end and rests against the valve element (74) at the other end, wherein the spring chamber (78) is hydraulically connected to the outlet (70b), in that the valve seat (72) is disposed in a seat sleeve (102), and wherein the seat sleeve (102) is attached in the blind hole bore (69) of the housing (58). 7. The high-pressure fuel pump according to claim 5, wherein the seat sleeve (102) is press-fitted and/or welded into the blind hole bore (69). 8. The high-pressure fuel pump according to claim 1, wherein the pressure relief valve (56) has a valve element (74), a valve seat (72) and a spring retainer (106), and wherein between the spring retainer (106) and the valve seat (72), a spring (76) is provided, which rests against the spring retainer (106) at one end and rests against the valve element (74) at the other end. 9. The high-pressure fuel pump according to claim 2, wherein the pressure relief valve (56) has a spring retainer (106), and wherein between the spring retainer (106) and the valve seat (72), a spring (76) is provided, which rests against the spring retainer (106) at one end and rests against the valve element (74) at the other end. 10. The high-pressure fuel pump according to claim 8, wherein the spring retainer (106) is attached to the valve seat (72). 11. The high-pressure fuel pump according to claim 2, wherein the pressure relief valve (56) has a spring retainer (106) and wherein the spring retainer (106) is attached to the valve seat (72). 12. The high-pressure fuel pump according to claim 8, wherein the spring retainer (106) is disposed at the bottom of the blind hole bore (69). 13. The high-pressure fuel pump according to claim 10, wherein the spring retainer (106) is disposed at the bottom of the blind hole bore (69). 14. The high-pressure fuel pump according to claim 8, wherein the spring retainer (106) includes a supporting arbor (112). 15. The high-pressure fuel pump according to claim 2, wherein the valve seat (72) adjoins a guide section (124) and in that a throttle gap (126) is formed between the guide section (124) and the valve element (74). 16. The high-pressure fuel pump according to claim 2, wherein the pressure relief valve further comprises a spring plate (94) resting against the valve element (74) and wherein the valve seat (72) adjoins a guide section (124) and in that a throttle gap (126) is formed between the guide section (124) and the spring plate (94). 17. The high-pressure fuel pump according to claim 1, wherein the high-pressure fuel pump (30) is a one-cylinder piston pump.