| 摘要 |
PROBLEM TO BE SOLVED: To provide a recliner shaft which is lightweight because a hollow is formed inside, which can reduce a manufacturing cost, and which can maintain sufficient torsional strength.SOLUTION: A recliner shaft 100 includes: a hollow pipe-shaped body 200; a plurality of spline protrusions 300 which are formed in a protruding shape on the radial outside of the body and extended along a lengthwise direction of the body; and a plurality of groove parts 400 that are formed in a depressed state on the radial outside in such a manner as to correspond to the spline protrusions on an inner surface of the body, respectively. The body includes curved surfaces that are arranged separately from one another in a circumferential direction of the body in such a manner as to have mutually different centers of curvature, respectively.SELECTED DRAWING: Figure 1 |
