Patent ID: 6343671
Filing Date: 2002-02-05
Classification: B62D,F16H

Abstract:
A vehicle steering system comprising:components for setting a primary steering angle of a vehicle in response to manual operation by a driver; and an actuator for generating an additional steering angle for the vehicle, said actuator comprising: a microprocessor; an electric motor connected to be controlled by said microprocessor and functioning as a drive; and a gear driven by said electric motor to apply the additional steering angle to at least one axle of the vehicle, wherein said actuator generates the additional steering angle independently of any manual operation by the driver, wherein said gear is a constant-pitch planetary rolling-contact threaded-spindle gear (12) and comprises a spindle rod (16), a spindle nut (14) surrounding the spindle rod, and a plurality of rollers (18) placed around the spindle rod (16), said rollers (18) having a groove profile (19) matching a thread (17) of the spindle (16), said rollers (18) being run on a plurality of guide rings (20) and interposed bearings (22), said rollers (18) being arranged at a fixed distance relative to the spindle nut (14) and from one another.