| 摘要 |
The invention relates to a radial piston pump for high-pressure fuel delivery in fuel injection systems of internal combustion engines, particularly in a common rail injection system, with a drive shaft (4) that is supported in a pump housing (2) and is embodied eccentrically or has a number of cam-like projections in the circumference direction, and preferably with a number of pistons (12) that are disposed radially with regard to the drive shaft (4), each in a respective cylinder chamber (18, 74), and can be set into a reciprocating motion in the radial direction in the cylinder chamber (18, 74) upon rotation of the drive shaft (4), wherein each respective cylinder chamber (18, 74) is sealed on the radial outside in relation to the drive shaft (4) by a valve plate (24, 72) that has an intake side check valve (26, 60) and a high-pressure side check valve (28); in order to increase the efficiency of the pump, the invention proposes that the intake side check valve (26, 60) has a tappet (30, 66) that passes through the valve plate (24, 72) and this tappet, on its end oriented toward the cylinder chamber (18, 74), has a valve disk (32, 70) that can be placed in a sealed fashion against a sealing seat (36) of the valve plate (24, 72), and that on the side of the valve plate (24, 72) remote from the cylinder chamber (18, 74), a device (38) is provided, which pre-stresses the tappet (30, 66) in the closing direction.
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