| 摘要 |
<p>PROBLEM TO BE SOLVED: To rapidly reduce the discharge of a pump to zero to stop a vehicle in case of emergency where travel has to be stopped by providing an emergency stop device for releasing interlock of both levers upon receiving an emergency command during operation, between the operating lever and the servo valve input lever. SOLUTION: In case of making an emergency stop during travel, when an emergency stop switch 25 of a detent part 4 is switched ON, a solenoid valve is switched into a G-position, and oil pressure in a servo pump 42 is led to a pressure oil hole 7b through the solenoid valve and a line 21. Oil pressure is therefore led to a pressure receiving chamber from the pressure oil hole 7b and a sleeve hole of the detent part 4 so as to move a piston to the right. Then lock of housing and a sleeve of the detent part 4 is released, so that a link lever is no longer interlocked with the operating quantity of a traveling operating lever 59. Accordingly, even in case of the generation of operating failure of a wire cable 58, a servo cylinder 53 is returned into a neutral position by a spring 53a, so that the discharge is reduced to zero, and a vehicle is brought to an emergency stop.</p> |
