Patent ID: 6514055
Filing Date: 2003-02-04
Classification: B60T,F04B

Abstract:
A piston pump, having a piston drivable to execute a reciprocating stroke motion, wherein the piston (16) is hollow, and whose interior includes a positive displacement chamber (42) of the piston pump (10); the piston pump (10) includes a fixed internal part (24) which protrudes into the interior of the hollow piston (16); the hollow piston (16) being formed from sheet metal, wherein a valve seat part (46) is positioned within the interior of the hollow piston (16) and divides a first annular chamber (48) from the positive displacement chamber (42), which first annular chamber (48) is formed between the valve seat part (46) and the inner surface of the hollow piston (16), and an inlet valve (44) controlling a fluid flow direction through the piston pump (10) is disposed on the valve seat part (46).