| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce force necessary for changing between disengagement and engagement of a clutch, and for retaining an engaged state. <P>SOLUTION: A spring 26 made of ferromagnetic shape memory alloy capable of contracting in an axial direction of rotating members 14, 16 while super-elastically deforming is provided between an electromagnet 12 and a movable member 24. The spring 26 takes on a coil shape, and in a state before super-elastically deforming, portions 26a of the ferromagnetic shape memory alloy and portions 26b of a magnetic gap are arranged alternately in the axial direction of the rotating members 14, 16. When the spring 26 contracts for engaging the rotating members 14, 16, the portion of the ferromagnetic shape memory alloy attracted to the electromagnet 12 attracts an adjacent portion of the ferromagnetic shape memory alloy with the magnetic gap in between in the axial direction of the rotating members 14, 16, and by this, attraction actions to the electromagnet 12 are carried out in a chain reaction. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
