Tokai Trw & Co., Ltd.

Trw Steering & Industrial Products (japan) 051156651

Keita Ozeki

Masaaki Kato

Yoshihito Imura

Kunio Takeuchi

Kideo Kominami

A power steering device comprising an input shaft connected to a steering shaft, an output shaft connected to a rack for driving vehicle wheels, a servo valve including a valve sleeve surrounding the input shaft and engaging the output shaft, and a torsion bar with both ends secured to the input shaft and the output shaft. In the power steering device, the torsion bar is positioned and secured via a balance pin in the input shaft. The balance pin has multiple projecting portions arranged alternately on opposite sides of the balance pin along the length of the balance pin. After inserting the balance pin into the input shaft and the torsion bar, the input shaft and the torsion bar are relatively rotated by the protruding portions of the balance pin. The servo valve is thus correctly centered. The hydraulic pressure produced by the servo valve is balanced.

Centering device for a servo valve of a power steering device

A control valve is disclosed herein. The control valve includes a valve sleeve and a rotor which is rotatably inserted into the valve sleeve. The valve sleeve have a plurality of fluid passages comprising a plurality of through passages which pass through the wall of the valve sleeve and a plurality of recessed grooves axially elongated on the inside surface of the valve sleeve. The rotor has a plurality of fluid passages opposing with said fluid passages of the valve sleeve. The fluid passages of the rotor cooperate with said fluid passages of the valve sleeve to open and close fluid flow. The valve sleeve has fluid flow noise suppress means formed by many continuous undulations along side edges of the recessed groove of the valve sleeve.

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Aichi, Japan

Keita Ozeki