US Patent 7810363 Electric steering locking apparatus

An electric steering locking apparatus includes a cam plate (5) that rotates in an unlocking direction (R1) and a locking direction (R2) by driving operation of a motor unit, and a locking shaft (8) that follows a sliding surface (6) of the cam plate (5) and that moves between a locking position where the rotation of a steering shaft is prevented and an unlocking position where the rotation of the steering shaft is permitted. The cam plate (5) is set such that a rotation center (O) coincides with a center of gravity (G).