STEERING COLUMN DEVICE

摘要

A steering column device has a downward U-shaped attachment bracket, an upward U-shaped lower jacket, a polygonal cylindrical mid jacket 3, a polygonal cylindrical upper jacket 4 inserted into the polygonal cylindrical mid jacket 3 and a shock energy absorbing mechanism 26 to absorb a shock energy at the time of a secondary collision. The shock energy absorbing mechanism 26 has a contracting guide part 27 to perform sliding and contracting operation of the upper jacket 4 to the mid jacket 3 separately from an energy absorbing part 28. The contracting guide part 27 is formed by interposing a plurality of linear guides 29 at an overlapping part between the mid jacket 3 and the upper jacket 4, linear guides 29 in which a plurality of bolls 29b arranged in the sliding direction of the mid jacket 3 and the upper jacket 4 are connected to each other through holders 29a.

主权项

1. A steering column device comprising:
a downward U-shaped attachment bracket fixed to a vehicle; an upward U-shaped lower jacket disposed inside a U-shaped space of the attachment bracket and supported by the attachment bracket; a polygonal cylindrical mid jacket disposed inside a U-shaped space of the lower jacket and supported by the lower jacket; a polygonal cylindrical upper jacket, of which a shape is similar to that of the mid jacket, inserted into and supported by the mid jacket so as to be able to slide; and a shock energy absorbing mechanism for absorbing a shock energy at a time of a secondary collision, wherein the shock energy absorbing mechanism has a contracting guide part to smoothly perform a sliding and contracting operation of the upper jacket to the mid jacket at the time of the secondary collision separately from an energy absorbing part serving as a load generation part to absorb the shock energy, wherein the contracting guide part is formed by interposing a linear motion guide member at an overlapping part between the mid jacket and the upper jacket, linear motion guide member in which at least two rolling elements arranged in a sliding direction of the mid jacket and the upper jacket are supported by a holder, and wherein a relative position between the mid jacket and the upper jacket is regulated except for at a time of collision by a pin member which is sheared at the time of the collision.