Radial piston pump for high pressure fuel delivery

A radial piston pump for high-pressure fuel delivery in fuel injection systems of internal combustion engines, which comprises a common rail injection system, 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 circumferential direction, said system includes a number of pistons (10) that are disposed radially with regard to the drive shaft, each in a respective radially extending cylinder chamber (12), said pistons are set into a reciprocating motion in the radial direction in the cylinder chamber upon rotation of the drive shaft (4), check valves (48, 62) on the intake side and the high-pressure side, for each piston (10), a metallic housing part (22), which constitutes the respective cylinder chamber (12), is provided with a fuel intake opening (44, 46) and a fuel outlet opening (60, 61), the housing part (22) rests with a flat contact surface (26) against a flat contact surface (28) of the metallic housing base body (30) from the radial outside with regard to the drive shaft (4), and a projecting section (66) of the housing part (22), which is concentric to the cylinder chamber (12) and is oriented toward the drive shaft, extends through a radial opening (67) of the housing base body (30) in a direction toward the drive shaft (4), the fuel inlet opening (46) and the fuel outlet opening (61) discharge into the flat contact surface (26) and are flush with other inlet and outlet openings (47, 65) in the housing base body (30), and that the housing part (22) is tightened against the housing base body (30) by means of screws (69) in such a way that the contact surfaces (26, 28) produce a high-pressure seal without the interposition of sealing elements.