Abstract: A vehicle suspension system has liquid pressure cylinder devices provided between the respective wheels and the vehicle body. Supply and discharge of hydraulic liquid to and from the liquid pressure cylinder devices is controlled according to the running condition of the vehicle. Each of the liquid pressure cylinder devices communicates with a pair of gas springs, each having a gas chamber and a liquid chamber parted from each other by a movable member. The liquid chamber communicates with the liquid pressure chamber of the liquid pressure cylinder device by way of a communicating passage, and the gas chamber is filled with gas. The initial pressure of one of the gas springs is higher than that of the other.

Abstract: A power-steering system for a vehicle includes a steering wheel which turns the front wheels, a power cylinder device which assists the steering wheel in turning the front wheels, a vehicle speed sensor which detects the vehicle speed, and a control unit which controls the power cylinder device so that the assisting force with which the power cylinder device assists the steering wheel is reduced with increase in the vehicle speed. The control unit has a reverse gear sensor which detects when the transmission of the vehicle is in reverse, and reduces the assisting force with increase in the vehicle speed at a higher rate when the vehicle runs rearward than when the vehicle runs forward.