Patent ID: 7950300

Claim:
A thrust transfer device comprising: a motor serving as a driving source; a sun gear mounted to be rotatable to an output shaft of the motor, a plurality of nut members each provided, at an outer periphery thereof, with an external tooth meshed with the sun gear and provided with, on an inner peripheral surface thereof, with a nut side spiral screw groove; a plurality of screw shafts, each provided, at an outer periphery thereof, with a screw side spiral screw groove corresponding to the nut side spiral screw groove, and reciprocally moved in accordance with rotating motion of the nut member by fitting the screw side screw groove into the nut side screw groove; and an auxiliary plate fixed to one of side end portions of the plural screw shafts and a pressing plate fixed to another of the side end portions of the plural screw shafts, wherein thrust generated by the reciprocating motion of the screw shafts is transferred through the pressing plate, and wherein when the sun gear is rotated, the nut members are rotated, and according to the rotating motion of the nut members, the screw shafts are reciprocally moved in axial directions thereof.