Patent ID: 6948584
Filing Date: 2005-09-27
Classification: B62D

Abstract:
1. A steering system for a motor vehicle including a hydraulic rack and pinion steering system, comprising a steering handle configured to prescribe a steering intention and adjustable by a driver, a rotatably mounted pinion arranged in engagement with an axially displaceable rack, a control valve device having a closed center, a hydraulic servomotor including a piston rod drive-connected to the rack and arranged to provide power assistance, the servomotor including two cylinder spaces connected to two cylinder connection on the control valve device via working lines, a pressure medium source, the pressure medium source and the control valve device configured to provide control of a fluid of pressure medium to and from the servomotor to deflect vehicle wheels, a pressure medium accumulator configured to produce and/or assist the flow of the pressure medium to and from the servomotor so that the vehicle wheels are steerable at least three times from a first stop to a second stop, if the pressure medium source fails, and, an electric actuating motor arranged at one end of the pinion, and not positively coupled to the steering handle,