| 摘要 |
A power transfer device including a main clutch, a cam mechanism and an electromagnetic pilot clutch mechanism coaxially assembled within a cylindrical space between an external cylindrical rotary member and an internal rotary member, wherein an electromagnetic coil of the pilot clutch mechanism is applied with an electric current to produce pilot torque, the cam mechanism is applied with the pilot torque to produce thrust force in an axial direction, and the main clutch is engaged by the thrust force applied from the cam mechanism to effect drive connection between the rotary members. In the power transfer device, residual thrust force of the cam mechanism is electrically or mechanically decreased at an instance when differential rotation of the rotary members is reversed.
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