Patent ID: 6474963
Filing Date: 2002-11-05
Classification: B60T,F04B

Abstract:
A piston pump with a piston that can be driven to execute a reciprocating stroke motion, characterized in that the piston (16) is hollow, having an inner chamber which constitutes a displacement chamber (40) of the piston pump (10), and that a valve (20) is accommodated inside the piston (16) and controls the flow direction of fluid to be supplied by the piston pump (10), wherein a valve seat part (22) of the valve (20) is accommodated inside the piston (16), the piston is formed with an end wall (18) and a side cylindrical wall, and the side cylindrical wall of the piston has a fluid opening (48), and that between the valve seat part (22) and the hollow piston (16), an intermediary space (24) is formed, which intermediary space communicates with the fluid opening (48) in the side cylindrical wall of the piston and also communicates with the displacement chamber (40) via the valve (20).