Patent ID: 6412474
Filing Date: 2002-07-02
Classification: F02M,F04B

Abstract:
A radial piston pump for producing high fuel pressure in fuel injection systems of internal combustion engines, in particular in a common rail injection system, with a drive shaft supported in a pump housing, which shaft is embodied eccentrically or has cam-like projections in the circumference direction, and preferably with a number of pistons (1), each in its own cylinder chamber (2), arranged radially with regard to the drive shaft, and with a plate (3) attached to the ends of these cylinders oriented toward the drive shaft, which plate (3) has a blind hole (9) in its center for receiving the end of the associated piston (1), wherein on its circumference, the piston (1) has a groove (7) into which a snap ring (6) is inserted in order to fasten a plate retainer (4) to the piston (1), which holds the plate (3) on the piston (1), the improvement wherein at the rim of the blind hole (9) in the plate (3), a cylindrical recess (26) is provided, the diameter of said cylindrical recess (26) being dimensioned so that the play between the snap ring (6) and the circumference of the cylindrical recess (26) is smaller than the depth of the groove (7).