| 主权项 |
1. A tilt steering apparatus, comprising:
a steering column that is pivotally displaced centered around a tilt shaft that is provided in a width direction of a section on a front side thereof, and supports a steering shaft on an inside thereof such that the steering shaft can rotate freely; a fixed-side bracket made of a metal material that is supported by a vehicle body and comprises a pair of support plate portions that hold the steering column; vertically long holes of the steering column that are provided in positions in each of the pair of support plate portions that are aligned with each other, and that extend in the up-down direction of the steering column; an adjustment rod that is inserted through the vertically long holes in the width direction of the steering column; an anchor portion on a base-end portion of the adjustment rod and that engages with one of the vertically long holes that is provided in one of the pair of support plate portions so as to be able to be displaced along the one vertically long hole; a driven-side cam made of a metal material that constitutes a cam apparatus that expands or contracts an axial dimension thereof according to rotation of the adjustment rod, that is fitted around a portion near a tip end of the adjustment rod so as to be capable of relative rotation with respect to the adjustment rod, that comprises a driven-side cam surface formed on an outside surface thereof, and a convex engaging portion formed so as to protrude from an inside surface thereof and engaging with other of the vertically long holes that is provided in other of the pair of support plate portions so as to be able to be displaced along the other vertically long hole in a state such that rotation thereof centered around the adjustment rod is suppressed; and a buffer member that is formed using a material that is softer than the metal material of the driven-side cam and the metal material of the fixed-side bracket, and that is attached to the convex engaging portion; stoppers being provided in at least two locations in the buffer member that are rotationally symmetric about a center axis of the adjustment rod, and the stoppers preventing collision between the convex engaging portion and a front-side edge or a rear-side edge of the other vertically long hole when the driven-side cam rotates as the axial dimension of the cam apparatus expands or contracts, and regulate the rotation of the driven-side cam; wherein the buffer member comprises a pair of buffer portions that have shapes to cover surfaces on both top and bottom ends of the convex engaging portion, and crank-shaped stepped surfaces that match each other are formed on the surfaces of both the top and bottom ends of the convex engaging portion and on end surfaces of the pair of buffer portions that face each other so as to match each other, and the stepped surfaces of the pair of buffer portions function as the stoppers. |
