Hydraulische Drehflügel Aktuator

摘要

A vane type hydraulic actuator comprises: a case (43) having a plurality of shoes (71); a rotor (44) having a plurality of vanes (64-67); oil pressure chambers for timing retard (73) and for timing advance (74) disposed between the vanes (64-67) of the rotor (44) and the shoe (71) of the case (43); and a locking means for retaining the rotor (44) to the case (43) so that the relative rotation between the case (43) and the rotor (44) is prevented; wherein the length in the peripheral direction of the tip portion of the vane or shoe having the locking means is substantially identical to that of the vane or shoe, which is located symmetrically with the vane or shoe having the locking means in respect with the axis of the rotor; and the length in the peripheral direction of the tip portion of the other vanes or shoes is shorter than that of the vane or shoe having the locking means.