| 摘要 |
<p>An electromagnetic clutch (C) includes a wrap spring (11) being wound around to be in a pressure bonding state relative to an outer peripheral surface (7D) of a tubular portion (7B) of a driving-side rotation member (7). A first end (11A) of the wrap spring (11) connects to a driving arm (12A) of a driving member (12), which connects to a driven-side rotation member (3). A second end (11B) of the wrap spring (11) connects to a rim portion (13C) of an operating member (13) formed in a disc form. The operating member (13) is rotatable relative to the driven-side rotation member (3) about the rotation axis (X) as the center and movable along the rotation axis (X). After a rotation of the operating member (13) is restrained, the driving member (12) is restrained from rotation, which operates the wrap spring (11) to twist and cancels the pressure boding state of the wrap spring (11) relative to the driving-side rotation member (7), which in turn provides a power cutoff state.</p> |
