| 摘要 |
A seat reclining apparatus includes an internal gear, an external gear, an eccentric drive mechanism, and a base plate. The internal gear is secured to a seatback arm. The external gear includes an external tooth portion being in meshing contact with the internal gear, the external tooth portion having a smaller number of teeth than the internal gear. The eccentric drive mechanism rotates the external gear with respect to the internal gear in meshing contact with the internal gear. The base plate is secured to a seatcushion arm. The base plate includes an internal tooth portion press-fitted to the external tooth portion of the external gear. The internal tooth portion of the base plate includes a part press-fitted to the external tooth portion of the external gear and a part loose-fitted to the external tooth portion of the external gear.
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