| 摘要 |
A vehicle seat reclining apparatus is provided which is simple in construction and which is capable of pressing pawls by a cam at places close to meshing portions. To that end, a plurality of pawls 31 having outer gears 44, 47 which are disengageably engaged with an inner gear 23 provided on an internal surface of an upper arm 12 are constituted by a first pawl 31A having an inner cam portion 45 which is engaged with a cam surface 55 provided on an outer circumference of a cam 32, a pawl grooved cam portion 46 which is engaged with an engaging protrusion 57 provided on a side surface of the cam, and an engaging portion 43 which is brought into engagement with a protruding portion 25 provided on the internal surface of the upper arm when the upper arm is pivotally moved a predetermined angle relative to a lower arm 11 and second pawls 31B having engaging protrusions 49 engaged with release plate grooved cam portions 59 provided in a release plate 33.
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