PURPOSE: To release a two-vane set of dual vanes in a V-shape during operation of a pump.
CONSTITUTION: Vanes 1 and 1' contained in the slit 21 of a rotor 2 are formed in a two-vane set state. A width spreading-form recessed part 11 or recessed groove is formed in the mating side of the vane on one side of the vanes 1 and 1'. The recessed part 11 or the recessed groove forms an oil pressure introduction passage. This constitution opens one set of vanes 1 and 1' in a V-shape by operation of an oil pressure to the recessed part 11 or the recessed groove when a pump is run and the rotor 2 is rotationally moved. This constitution cuts off the gap of the slit 21 and suppresses leakage of pressure oil from a slit bottom part 22 to the suction port 52 side, resulting in prevention of the occurrence of pump pulsation.
SUZUKI HIROYUKI
ANDO KAZUYA
