| 摘要 |
An auxiliary device driving unit connectable to an engine of a vehicle has a frictional transmission type stepless speed-change gear with a differential planetary structure disposed in a transmission system for transmitting a force from a input shaft connected to the crank shaft of the engine to a pulley for driving auxiliary devices. Control of change in speed is performed by shifting a speed-change ring as an element of speed-changing in the axial direction of the input shaft. An actuator for shifting the speed-change ring is constituted by an non-contact type electromagnetic brake immovably attached to the stepless speed-change gear, a ring-shaped cam connected to a rotating element of the electromagnetic brake, a cam follower fixed to the speed-change ring to be in contact with a cam surface formed in the cam, and an electric circuit for controlling the electromagnetic brake depending on the condition of operations of the auxiliary devices.
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