ACTUATOR AND EXHAUST VALVE DRIVING DEVICE

An actuator includes a housing , an output shaft protruding from the inside of the housing to the outside, a motor provided in the housing , and a reduction mechanism that connects the motor with the output shaft . The reduction mechanism includes a worm gear, in which a worm provided at a front end of a drive shaft protruding from a main body of the motor and a worm wheel rotating integrally with the output shaft are engaged. A spindle for increasing an inertia is provided between the worm of the drive shaft and the motor body