Patent ID: 6347843
Filing Date: 2002-02-19
Classification: B60T,F04C,Y10T

Abstract:
A pump equipment for a hydraulic circuit comprising:a casing having a shaft hole; a drive shaft rotatably fitted into the shaft hole; a pump room provided in the casing; a rotor member contained in the pump room to be rotated by the drive shaft; an intake port and a discharge port respectively arranged on side walls of the pump room for sucking fluid from the hydraulic circuit and discharging compressed fluid to the hydraulic circuit according to the rotation of the rotor member; and a fluid communicating path provided on the side walls of the pump room, the fluid communicating path extending from the intake port to the shaft hole so that the fluid flows therethrough from the shaft hole to the intake port, wherein the fluid communicating path is a groove, the depth of the fluid groove being thinner than that of the intake port.