Patent ID: 6544007
Filing Date: 2003-04-08
Classification: F04B

Abstract:
A radial piston pump (1) for reduction of noise by reducing a pressure gradient during a compression stroke of a piston of the radial piston pump (1), the radial piston pump (1) comprising:a pump housing (3); and a plurality of cylindrical bores (5) configured in a star-shape around a cam (4) and each one of the bores (5) receiving one piston, each of the bores (5) defining an inner chamber (9), for housing a compressible working volume, having an inlet valve (7) and an outlet valve (8), and each one of the bores (5) having at least one pressure relief opening for bleeding off a portion of the working volume at least during the compression stroke of the piston; wherein the piston (6) has a chamfer (20) on a forward rim which coacts with the inlet valve (7), and the chamfer (20) has a chamfer length (17) and a chamfer angle (18).