Patent ID: 6352415
Filing Date: 2002-03-05
Classification: B62D,F04C

Abstract:
A variable capacity hydraulic pump comprising:a pump body; a cam ring supported within an inner space of the pump body to swing in a swinging direction, the cam ring defining: a pump chamber; a first fluid pressure chamber on one side of the swing direction of the cam ring; and a second fluid pressure chamber on the other side of the swinging direction of the cam ring; urging member provided for urging the cam ring to a direction to maximize a capacity of the pump chamber; a discharge path connected to the pump chamber, the discharge path through which a fluid discharged from the pump chamber flows; a variable metering throttle provided in the middle of the discharge path; and a control valve operating in response to a fluid pressure difference between an upstream and downstream sides of the variable metering throttle, wherein a fluid pressure within at least the first fluid pressure chamber is controlled by the control valve to swing the cam ring; and the variable metering throttle is provided at a position between the side surface of one side of the cam ring in an axial direction of the cam ring and the side wall of the pump body facing the side surface; and the variable metering throttle is structurally isolated from the second fluid pressure chamber.