| 摘要 |
PURPOSE: A reclining device and the manufacturing method are provided to prevent abnormal noise, minimize non-uniformity in the rotation angle range of an operation shaft, and retain balance of the pushing force between a locking tooth part and a cam plate. CONSTITUTION: A reclining device comprises a casing(10), a cap rotatably mounted on the casing, having a first gear along an inner circumference thereof, and a plurality of second gears for engaging with the first gear, each having a second locking cam(25), disposed in axial symmetry with a rotational axis of the casing. The cam comprises a plurality of first locking cams(41) for pressing the second locking cam to thereby engage the second gear with the first gear, disposed in axial symmetry with a rotational shaft of the cam, and a plurality of guiding faces(45) disposed in axial symmetry with the rotational shaft of the cam and on a straight line(L2) perpendicular to a line(L1) passing through two first locking cams located axially opposite each other. The casing includes a plurality of guides(11A) for guiding the guiding face, disposed in axial symmetry with a rotational shaft of the casing and on a straight line(L4) perpendicular to a line(L3) passing through two second locking cams located axially opposite each other.
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