| 摘要 |
An electromagnetic clutch includes: a rotary member; an output mechanism including an electromagnetic coil and an armature moved toward the electromagnetic coil by electromagnetic force; a cam mechanism operated by rotation of the rotary member in the electromagnetic coil energized state; and a coil housing having a coil accommodating portion open toward the armature and accommodating the electromagnetic coil. The coil housing and the armature have frictional engagement faces. The frictional engagement faces of the coil housing and the armature are frictionally-engageable. At least one of the coil housing and the armature has a contact pressure reducing portion for reducing contact pressures of the frictional engagement faces of the coil housing and the armature, generated based on cam thrust generated through an operation of the cam mechanism when the frictional engagement faces of the coil housing and the armature are frictionally-engaged.
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