| 摘要 |
PROBLEM TO BE SOLVED: To provide a vehicle seat reclining device capable of improving the lock strength and preventing the looseness of the lock. SOLUTION: The lock tooth 20 of the device is disposed in such a way that it can be rotated by an axis part 16 projecting from a machine casing 10 and having the center O of rotation of the lock tooth 20 and two circular arc-shaped guide surfaces 11a and 11b via the axis part 16. The lock tooth 20 has teeth 21, or an external gear 21 to be engaged with internal gear 61, on one side surface on the free end side, and a cam surface 25 is formed on the rear side of the external gear 21 for oscillating the lock tooth 20 via the axis part 16. The center O of rotation of the lock tooth 20 is set near the inner side of the internal gear 61.
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