Patent ID: 6238189
Filing Date: 2001-05-29
Classification: F02M,F04B

Abstract:
A radial piston pump for a high-pressure fuel supply in fuel injection systems of internal combustion engines, comprising a drive shaft (4), which is supported in a pump housing (2) and embodied as one of an eccentric drive and camlike protuberances in a circumferential direction, a plurality of pistons (10), disposed radially with respect to the drive shaft (4) in a respective cylinder chamber (12) of a metal insert part (22), upon rotation of the drive shaft (4) the pistons are movably radially back and forth in the respective cylinder chamber, each piston includes a face end (36) remote from the drive shaft (4), each face end defines one of a suction and compressor chamber (38), an intake check valve (44) on an intake side in a first metal housing part (40) and an output check-valve (46) on a high-pressure side (42) in a second metal housing part (50) are provided, respectively for each piston (10), the metal insert part (22) forming the respective cylinder chamber (12) is provided inside the housing (2) and radially to the drive shaft (4), the cylinder chamber communicates with the intake side of the first metal housing part (40) and with the high-pressure side (42) of the second metal housing part (50), and that the respective metal insert part (22), is directed in a direction toward the drive shaft (4) between the first and second metal housing parts (48, 50) which include bearing faces (24, 26; 52, 54) extending perpendicular to the drive shaft with the respective metal insert part (22) resting on the bearing faces; and the respective metal insert part (22) has a fuel delivery opening (32) and a fuel discharge opening (34), the fuel discharge opening discharges in a region of the bearing faces and is aligned with a further respective delivery opening (58) and discharge opening (60) in the first and second metal housing parts (48, 50); and the first and second metal housing parts (48, 50) are tightened against one another, with an interposition of the metal insert part (22), in such a way that the bearing faces (24, 26; 52, 54) of the respective metal insert part (22) and first and second metal housing parts (48, 50) bring about high-pressure sealing without the interposition of sealing elements, and the intake check valves (44) on the intake side and output check valve (46) on the high-pressure side, respectively, are integrated with the first housing part (48) and the second housing part (50), respectively; and that a downstream side of the output check valve (46) on the high-pressure side extends as far as a high-pressure connection stub (68) with the high-pressure side extending entirely inside the second metal housing part (50).