| 摘要 |
<p>A reclining mechanism ratchet (50) which is tiltably supported with respect to a base plate and on which an annular internal gear (54) surrounding recesses is formed on a surface-side facing the base plate, wherein a rear-side annular portion (60) having an outer peripheral surface positioned at a radial position between the pitch circle and the addendum circle of the internal gear (54) is formed on the rear side surface of the ratchet (50). As a result, it is possible to form the internal gear (54) with high-precision so as to produce the ratchet (50) in a smaller size, and also to improve the durability of a die for forming the internal gear (54).</p> |
