| 摘要 |
A power-assisted steering device for a vehicle comprises a two-part steering column which parts are capable of limited relative angular displacement, and a hydraulic power-assistance mechanism responsive by means of a hydraulic distributor to relative angular displacement of the parts. The distributor comprises a stator having a pressure orifice connected to a hydraulic pump, a return orifice connected to a fluid reservoir, and two service orifices connected to the assisting jack. Two adjacent rotors are located within the stator and these are rotatable respectively with said two parts, the first rotor having distribution passages interacting with the stator pressure and return orifices, and the second rotor having distribution passages interacting with the first rotor distribution passages and the stator service orifices. According to the invention, the stator pressure and return orifices communicate respectively with two chambers, one of which is peripheral and communicates directy with the first rotor distribution passages comprising apertures located in the outer periphery of the rotor, and the other of which is central and communicates directly with first rotor distribution passages comprising passages located adjacent the inner periphery of the rotor, the first rotor being located within the axial dimension of both of said chambers.
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