| 摘要 |
PURPOSE:To aim at making improvements in steerability and driving stability by constituting rear wheels to be steerable in equiphase and in autiphase in relation to front wheels, while making a car steerable with these front wheels only. CONSTITUTION:A controller makes a control valve 14 open or close according to each signal out of a car speed sensor 17 and a front-wheel steering sensor 18 and a rear-wheel steering mode in relation to an equiphase position, an antiphase position and a rectilinear position of a rear-wheel steering phase selector switch 16. When this control valve 14 is opened or closed, pressure oil fed to a pump port flows in a rear supply side hydraulic pipeline 38 from one side of the cylinder port. If a spool is rotated in this state, plural pump ports are connected to one side of plural cylinder ports at a control valve 21, therefore the pressure oil is fed to each cylinder chamber of a front booster 20 and a rear booster 40, thereby steering both front and rear wheels to the specified phase. |
