| 摘要 |
An apparatus ( 10 ) for use in turning steerable vehicle wheels ( 12, 14 ) includes first and second piston and cylinder type hydraulic motors ( 32, 34 ) which are connected with a central portion of a vehicle. A steering control valve ( 24 ) is operable in response to manual rotation of a steering wheel ( 18 ) to effect extension and contraction of the first and second hydraulic motors. A rack and pinion steering gear ( 110, 114 ) may be connected with a piston rod ( 86 ) of one of the hydraulic motors ( 32 ). A secondary control valve ( 200 ) may be provided to effect operation of one of the hydraulic motors to a greater extent than the other hydraulic motor.
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