| 摘要 |
PURPOSE:To eliminate a chattering of connections of a link cable and the like by introducing the operation pressure oil of a power cylinder for the front wheel steering to a hydraulic reaction chamber furnished at a hydraulic control valve so as to give a pressing force in the direction of the converting operation of the hydraulic control valve. CONSTITUTION:By feeding the operation pressure oil to the right side chamber 10a of a power cylinder 10 for the front wheel steering in steering the front wheels, a piston 11 moves to the left. As a result, a spool 20 of a hydraulic control valve 18 is moved to the left in the same direction of the piston 11 by a link 22 and a cable 24a, the pressure oil is fed to the right side chamber 16b of the power cylinder 10 for the front wheel steering, and the real wheels are steered in the same phase as the front wheels. In this case, the operation pressure oil of the power cylinder 10 for the front wheel steering is reduced the pressure at a pressure reducing valve 27 after passing through a pressure oil piping 26b, and introduced to the right side hydraulic reaction chamber 18b of the hydraulic control valve 18. By the pressure oil introduced to the reaction chamber 18b, the spool 20 is given a pressing force to the left, and the chattering of the link 22 and the cable 24a is eliminated. |
