| 摘要 |
A seat reclining apparatus includes: a fixing member; a pivot member having an internal tooth located on an inner circumference surface of the circular recessed portion; a lock tooth having an external tooth arranged to be engaged with the internal tooth of the pivot member, the lock tooth being arranged to be moved along an orbit between an engagement position and a disengagement position; a cam; an urging member; the lock tooth including a pair of guide protrusions which are disposed on both sides of the lock tooth, and which protrude axially toward the fixing member, and the fixing member including a pair of guide grooves formed on an inside surface of the fixing member, and arranged to receive, respectively, the guide protrusions of the lock tooth to guide the lock tooth along the orbit between the engagement position and the disengagement position.
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