Power steering for motor vehicles

A hydraulic power steering for motor vehicles comprising:

• a steering control element, a position setting unit connected to said steering control element so as to be settable thereby, a first control motor connected to said position setting unit by way of a control circuit to be operated thereby, a servo valve having two control parts which are supported so as to be rotatable with respect to each other but are operatively coupled by spring means adapted to retain the control parts in a central rest position with respect to each other, one of said control parts being operatively connected to said first control motor to be rotated thereby depending on set values provided by said steering control element and the other control part being connected to a steering gear mechanism which is connected to steered wheels of the motor vehicle, and a hydraulic servo motor arranged to aid the movement of said steering gear mechanism and being connected to said servo valve so as to receive hydraulic fluid therefrom depending on the relative rotary positions of said servo valve control parts and a second control motor effective to displace said two servo valve parts relative to each other for executing automatic steering corrections.