| 摘要 |
An electromagnetic clutch device for transmitting torque from an input means to an output means includes a clutch actuating means in the form of an electromagnetic winding. The input means includes a driving plate coaxially disposed with and connected to an input shaft for rotation therewith, a driving friction ring member coaxial with the input shaft and connected to the driving plate for rotation with the input shaft and axial movement relative to the input shaft, and an armature coaxially disposed with and threadably connected to the friction ring member. The relative rotational motion between the armature and the output means causes the armature to advance on the thread thereby allowing the friction ring member to fully engage with the output means. The relative position between the armature and the driving friction ring member is maintained by a retarder disposed between the armature and the driving friction ring which permits relative rotational motion between the driving friction ring member and the armature in one direction while preventing relative motion in the opposite direction. In addition, a driving spring force reducer coacts with the driving plate and armature to bias the friction ring member toward the input means to compensate for the increased spring force exerted on the friction ring by the driving spring as the friction surface wears.
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