PURPOSE: To prevent the occurrence of cavitation, by a method wherein a suction pipe running from a reservoir to a vane pump is branched into plural parts, return pipes from a fluid pressure device are joined together to form a one-piece pipe, and the tip thereof is caused to face on the outflow port of the reservoir.
CONSTITUTION: When a car engine E started, vane pumps Pa and Pb suck fluid from a reservoir T, and the fluid is fed to a power steering device A and a fan drive hydraulic motor B. The return flows of pressure fluid, by means of which a given work is effected with the aid of a hydraulic responding device, are joined approximately in the same direction at an Y-shaped joining pipe. Therefore, speed energy is synergistically increased and outputted with a force through a return pipe 40d, and thereby fluid around an outflow port 23 is sucked in a suction pipe 20b through the roll-in action of the return flow to exert a more powerful supercharge action. Since the fluid is smoothly and uniformly branched through a Y-shaped branch pipe 20a, insufficient suction is prevents from occurring to a vane pump.
TANAKA TSUNEO
INAGUMA YOSHIHARU
KATOU TOSHIYA
MORI KATSUHISA
