Patent ID: 8328672

Claim:
A power unit for driving a driven unit and an auxiliary device, comprising: a prime mover having an output shaft for use in outputting power; a rotary actuator having a body of rotation for use in outputting power; a differential gear having a first rotating element, a second rotating element, and a third rotating element capable of transmitting power between each other, wherein the first rotating element is connected to the output shaft of the prime mover, the second rotating element is connected to the body of rotation of the rotary actuator, and the third rotating element is connected to the driven unit via a first power transmission path; a first power transmission system included in the first power transmission path and selectively operable between a first operating state for enabling power transmission in the first power transmission path and a second operating state for disconnecting power transmission in the first power transmission path; a second power transmission path which connects the output shaft of the prime mover and the driven unit bypassing the differential gear and the first power transmission system; and a second power transmission system included in the second power transmission path and selectively operable between a third operating state for enabling power transmission in the second power transmission path and a fourth operating state for disconnecting power transmission in the second power transmission path without disconnecting the power transmission in the first power transmission path, wherein the auxiliary device is connected to one of the second rotating element and the third rotating element of the differential gear.