| 摘要 |
PURPOSE:To make two-wheel steering and four-wheel steering automatically selectable according to a steering value by performing the two-wheel steering when the steering value is little, and making it so as to become the four-wheel steering when the steering value grows much. CONSTITUTION:When a steering handwheel 16 is little rotated and a vehicle is steered, discharge oil of a hydraulic pump 4 is fed to a front-wheel cylinder 3F alone because a limit switch 33 is turned off and a selector valve 6 is situated in a two-wheel steering position (A). When the steering handwheel 16 is further operated and a projection piece 32 of an output shaft 31 pushes the limit switch 33 and turns it to ON, a solenoid part 6S is excited and thereby it is selected to a four-wheel steering position (B), so that pressure oil is fed to both sides of front-rear wheel cylinders 3F, 3R. |
