PURPOSE: To enable the change of steering angle ratio by employing a simple structure, i.e., by interposing between the device for regaining the neutral position and the steering wheel of a control device resilient means which provides a rotary change to the steering device within a linear spring constant in response to steering torque.
CONSTITUTION: As the steering character is V=O while a vehicle is stopped, the phase angle which a power input shaft 22 travels from the power output shaft 14 by the twisting of a torsion bar 18 changes along the distance O-B. The twisting occurs as the steering torque increases since the steering wheel is manipulated. The torsion bar 18 connot move beyond that phase angle even if the traction resistance increases subsequently. Thus, the rotation of the power input shaft is synchronized with the power output shaft. Since the power input and output shafts are displaced by the phase angle within the distance O-B, the steering angle ratio of the steering wheel 30 is large within that distance. However, the steering angle ratio relates to steering angle change but irrelevant to steering power change. Accordingly, light and quick steering is feasible when the vehicle is stopped.