Patent ID: 6112844
Filing Date: 2000-09-05
Classification: B62D

Abstract:
A hydraulic power steering for a motor vehicle having steered wheels, said power steering comprising: a steering control element, a position setting means connected to said steering control element so as to be operable thereby and providing a steered vehicle wheel setting value, a steered vehicle wheel position sensor sensing the actual steered vehicle wheel positions and providing a steered vehicle wheel position value and a control circuit comparing said steered vehicle wheel setting value with the actual steered vehicle wheel position value, a control motor connected to said control circuit to be operated thereby depending on the difference between said steered vehicle wheel position and setting values, a servo valve including a housing receiving control parts comprising a sleeve part and a rotary spool part rotatably received in said sleeve part and coupled to said control motor, said sleeve part being connected to said housing, a torsion rod interconnecting said rotary spool part and said housing so as to retain said spool part in a central rest position with respect to said sleeve part and a hydraulic servo motor operatively connected to the steered wheels of said motor vehicle and being in communication with said servo valve for supplying hydraulic operating fluid to said hydraulic servomotor depending on the relative position of the control parts of said servo valve.