| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce load applied to a rotation sensor and to suppress increase of a size in a thrust direction while enhancing detection accuracy of a rotation amount detection member. <P>SOLUTION: A transmission gear 24 is integrally rotatably provided on a rotation shaft 10a of a spool. The rotation sensor 15 is made eccentric to the rotation shaft 10a, is arranged in a radial direction of the rotation shaft 10a and is arranged in a direction in which the rotation shaft 10a is left from the rotation sensor 15 by large load F applied from a seat belt to the spool 10 at emergency. The rotation sensor 15 has a circular ring-like magnet 21 and a magnet retaining member 22 for retaining the magnet 21, and the magnet retaining member 22 has a gear 23 to be transmitted. An outer tooth 23a of the gear 23 to be transmitted and an outer tooth 24a of the transmission gear 24 are engaged with each other, and rotation of the spool 10 is speed-increased and transmitted to the gear 23 to be transmitted. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
