| 摘要 |
PURPOSE:To obtain harmonious and smooth operation by inserting and connecting a parallel circuit consisting of a switch which detects shift of an input member to other position except a neutral position to be opened and a switch which detects a locking state to be opened to a conductive circuit of an electromagnetic opening/closing valve. CONSTITUTION:When an input member shifts from a neutral position, a switch 17 is operated to close an electromagnetic opening/closing valve 5 which releases a hydraulic control system, the hydraulic control system is switched to a controlled state, and a neutral locking mechanism 60 is simultaneously released. In conjunction with the action of an input rod 20 the hydraulic control system is operated to drive a main actuator 26. Adversely, when the input member is returned to the neutral position, the hydraulic control system is operated to first return the main actuator 26 to the neutral position, and a switch 27 is operated to maintain the hydraulic control system at a controlled state until the neutral locking mechanism 60 reaches a locking state, and thus, locking operation of the neutral looking mechanism 60 is performed moderately and smoothly. |
