A steering wheel position adjustment device comprising:
- a cylindrical steering column having an inner side to which a steering shaft having a rear end portion configured to support a steering wheel is rotatably supported;
- a displacement bracket fixed to a portion of the steering column and formed with a column-side through hole penetrating the displacement bracket in a width direction;
- a support bracket having a pair of support plate parts and supported to a vehicle body, the pair of support plate parts interposing therebetween the displacement bracket from both sides in the width direction and formed with vehicle body-side through holes at portions where the support plate parts conform to each other;
- an adjustment rod inserted in the column-side through hole and the vehicle body-side through holes in the width direction;
- a pair of pressing parts provided at both end portions of the adjustment rod protruding from outer surfaces of the pair of support plate parts;
- an adjustment lever provided at one end portion of the adjustment rod and configured to rotate about the adjustment rod to expand and contract an interval between the pair of pressing parts;
- and
- a friction plate interposed in at least one of a portion between an inner surface of the pair of support plate parts and a side surface of the displacement bracket and a portion between an outer surface of the pair of support plate parts and an inner surface of the pair of pressing parts,
- wherein at least one of the column-side through hole and the vehicle body-side through holes is configured as an adjustment long hole which is long in a direction in which a position of the steering wheel is adjustable,
- wherein the friction plate includes at least one rotating friction plate having a base end portion rotatably supported to a rotation support shaft and a tip half portion formed with a long guide hole with which the adjustment rod is engaged,
- wherein the rotation support shaft is provided at a portion which is displaced relative to the adjustment rod when the adjustment rod is displaced along the adjustment long hole and which is positioned on an extension line of a center line of the adjustment long hole,
- wherein the adjustment rod is engaged with the long guide hole to be displaceable only along the long guide hole, and
- wherein at least a portion of the at least one rotating friction plate is interposed in the at least one of the portion between the inner surface of the pair of support plate parts and the side surface of the displacement bracket and the portion between the outer surface of the pair of support plate parts and the inner surface of the pair of pressing parts.