Patent ID: 6332761
Filing Date: 2001-12-25
Classification: F02M,F04B,Y10T

Abstract:
A radial piston pump for high-pressure fuel delivery in fuel injection systems of internal combustion engines in a common rail injection system, comprising a drive shaft (4) that is supported in a pump housing (2), said drive shaft is eccentrically embodied or has a number of cam-like projections in the circumference direction, a number of pistons (12) which are arranged radially in relation to the drive shaft (4), each in a respective cylinder chamber (18), each of said pistons move in a reciprocating fashion in the cylinder chamber (18) when the drive shaft (4) rotates, a spring-preloaded check valve (42, 68) respectively on an intake side and on a high pressure side, a housing component (16) includes a through opening (20) that constitutes the cylinder chamber (18), a high-pressure delivery opening (66) leads away from the cylinder chamber (18) and in a sealing seat (76) of the high pressure side check valve (68), opens out into a mounting opening (74) in the component (16), said mounting opening contains the valve components (68), with the exception of a valve body (78) which is placed against the sealing seat (76), the high-pressure side check valve (68) is inserted into the mounting opening (74) as a preassembled unit (88) and is tightened against the component (16) to form a high-pressure seal, and that the valve unit (88) includes a cup-shaped loading element (98), which is pre-stressed in a closing direction and moves in a limited fashion in the closing or opening direction, and which, with an outside of a cup bottom (100), the loading element forces the valve body (78) into contact with the sealing seat (76).