Patent ID: 6514050
Filing Date: 2003-02-04
Classification: F02M,F04B,F16J

Abstract:
A radial piston pump for high-pressure fuel delivery in fuel injection systems of internal combustion engines including a common rail injection system, which comprises an eccentric drive shaft (4) that is supported in a pump housing (2), a number of pistons (10) that are disposed radially with regard to the drive shaft, each piston is operative in a respective cylinder chamber (12), and is set into a reciprocating motion in the radial direction in the cylinder chamber upon rotation of the drive shaft (4), said system includes an intake check valve (48) on an intake side and an output check valve (62) on a high-pressure side of said cylinder, wherein for each piston (10), a metallic housing part (22), which constitutes the respective cylinder chamber (12), is provided with first and second fuel intake openings (44, 46) and first and second fuel outlet openings (60, 61), the housing part (22) rests with a flat contact surface (26) against a flat contact surface (28) of a metallic housing base body (30) from a radial outside with regard to the drive shaft (4), said housing part (22) includes a projecting section (66) which is concentric to the cylinder chamber (12) and is oriented toward the drive shaft, said projecting section (66) extends through a radial opening (67) of the housing base body (30) in a direction toward the drive shaft (4), said second fuel outlet opening (61) discharges into the flat contact surface (26) and is flush with a third outlet opening (65) in the housing base body (30), and that in a widened mouth region (100) of the second fuel outlet opening (61) in the housing part (22) and the third outlet opening (65) that is flush with the second outlet opening in the housing base body (30) is provided with a metallic high-pressure sealing element (106, 114, 126, 130-134) which includes end faces, and that the housing part (22), with the interposition of the metallic high-pressure sealing element, is tightened against the housing base body (30) by way of screws (69) in such a way that the high-pressure side is sealed through the clamping of the high-pressure sealing element, with second fuel outlet opening (61), said third outlet opening (65), and said high-pressure sealing element all being coaxial, with the end faces of the high-pressure sealing element providing the sealing function.