| 摘要 |
PURPOSE:To prevent the advance and delay of steering between front wheels and rear wheels by enabling a selector valve to be instantly switched over when shifting is generated in steering between said front wheels and rear wheels, to correct said shifting. CONSTITUTION:Engaging members 42, 43 which are moved with the movement of the rods are provided on the tie rods 28, 38 of front wheels 26 and rear wheels 41, respectively. These engaging members 42, 43 are connected to the wires 44, 45 of a shifting detecting mechanism (a). The shifting detecting mechanism (a) consists of a rack members 49, 50 provided in parallel to a casing 48, racks 51, 52 formed on the opposite faces of the rack members 49, 50, a pinion 57 which is meshed with these racks, and springs 53, 54 housed in the rack members 49, 50. If the steering of the rear wheel is more advanced than that of the front wheels, the springs 53, 54 are contracted and expanded due to the action of the wire 45, thereby, operating a spool rod 60 and moving a spool 61, to return the high pressure oil of an excessively advanced actuator into a tank T. |
