| 摘要 |
A power-steering device using hydraulic pressure is provided of a construction utilizing a ball nut on a steering spindle worm disposed in a pressure piston wherein the ball nut is housed within the piston and actuates a spool valve which controls pressure to and from both ends of the piston. The valve itself is carried in the piston transversely of the axis, is displaced radially therefrom and is driven by an actuator connected with the ball nut. The device has a housing providing suitable flow passages for pressure feed to and exhaust from the valve, the piston having elongated longitudinal passage, among others, which maintain flow communication with housing passages at all positions of the piston. The piston further carries a regulator valve which restricts a pressure differential between the chambers at both ends of the piston for a higher level vehicle speed, for safety steering purposes.
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