Steering column device

1. A steering column device comprising:

a lower jacket formed in a tubular shape and configured to be swingably supported to a vehicle body;

an upper jacket formed in a tubular shape and inserted in the lower jacket in such a way as to be movable in a tube-axis direction;

a locking mechanism including an operating lever capable of being operated between a lock position where the upper jacket is locked to the lower jacket and an unlock position where the upper jacket is movable in a tube-axis direction of the lower jacket; and

an energy absorbing mechanism disposed between the lower jacket and the upper jacket and configured to absorb impact energy applied to the upper jacket in the tube-axis direction via deformation of an energy absorbing member, wherein

the locking mechanism includes

an operating shaft to which the operating lever is attached and which is turnable between the lock position and the unlock position,

a locking shaft disposed on a vehicle front side relative to the operating shaft in parallel to the operating shaft,

a guiderail disposed in a slit formed in the lower jacket along the tube-axis direction, and having one end portion swingably supported to a tip portion of the slit and another end portion disposed between the upper jacket and the locking shaft,

a locking member including a catching claw and disposed to be movable along the guiderail,

a locked member which is disposed on a portion of an outer peripheral surface of the upper jacket that the locking member faces and in which a plurality of catching recesses that the catching claw of the locking member is engageable with are formed in the tube-axis direction,

a cam member disposed on the locking shaft and configured to press the locking member against the locked member via the guiderail in such a direction as to engage the locking member with the locked member,

a biasing member configured to bias the cam member in the engaging direction, and

a linking member disposed on the operating shaft and configured to bring the cam member into a state where the locking member and the locked member are disengaged from each other when the operating shaft is moved to the unlock position, and

a wire member which functions as the energy absorbing member is formed in a U-shape such that a catching part at one end is caught on the locking member, a curved part at a middle section is curved around an outer periphery of the cam member, and a turned part at another end section is turned backward.

2. The steering column device according to claim 1 , wherein the wire member is disposed such that a part thereof connecting the catching part and a position of a start point of the curve of the curved part is parallel to the direction of movement of the upper jacket.

3. The steering column device according to claim 1 , wherein the catching claw of the locking member is formed in a saw-tooth shape in cross section by a tapered surface and a vertical surface, and the catching recesses of the locked member are each formed in a saw-tooth shape in cross section by a tapered wall surface and a vertical wall surface.

4. The steering column device according to claim 2 , wherein the catching claw of the locking member is formed in a saw-tooth shape in cross section by a tapered surface and a vertical surface, and the catching recesses of the locked member are each formed in a saw-tooth shape in cross section by a tapered wall surface and a vertical wall surface.