Patent ID: 8084908

Claim:
A generator/motor as an auxiliary power unit of an engine, the generator/motor comprising: a ring-shaped stator core fixed to a motor housing, a motor rotor rotatably supported by the motor housing, the motor rotor including: a ring-shaped rotor yoke which is opposed to an inner peripheral surface of the stator core at a predetermined gap therebetween, a rotor flange which fixes and supports the rotor yoke, and a cylindrical shaft portion disposed at a center of the rotor flange and transmitted rotation directly between the rotor flange, wherein the rotor flange is rotatably supported by a support portion of the motor housing through a bearing, and wherein the cylindrical shaft portion is configured at its center to transmit the rotation between the rotor flange, and is formed at its both ends with spline teeth which are disposed on a same axis respectively, the spline tooth formed on the one end of the cylindrical shaft portion and a region to eject rotation of the engine are spline coupled on the same axis, and the spline tooth formed on the other end of the cylindrical shaft portion and an input shaft of a hydraulic pump or a transmission are spline coupled on the same axis.