Patent ID: 7478573

Claim:
Overriding drive for an overriding steering system, wherein a steering angle inputted by the driver can be overridden by another angle by means of a control according to correcting variables, and wherein the overriding drive is locked electromechanically in dependence on further correcting variables representative of an operating state of the vehicle, the overriding drive including a freewheeling mechanism having an inner ring, which inner ring is configured to be locked in both operative engagement by at least a first clamping member and positive engagement with a second clamping member, wherein the operative locking is provided by the at least one first clamping member, being brought into frictional contact with the inner ring of the freewheeling mechanism by way of a radial actuation, and the positive locking is provided by the at least one second clamping member, being brought into a form-fit contact with the inner ring of the freewheeling mechanism by way of a radial actuation and wherein a first actuating ring is associated with the freewheeling mechanism for the positive connection and a second actuating ring is associated therewith for the operative connection, said rings being entrained with the clamping members upon radial actuation thereof so that rotation of the inner ring is prevented by means of a clamping contour at an outer ring of the freewheeling mechanism.