| 摘要 |
PURPOSE:To secure the safety of a car body through automatic closing of the oil passages on the contraction side of cylinders at the time of engine stall, by providing on the extension chamber side of suspension cylinders oil discharge passages through pilot check valves which make a pump discharge pressure a pilot pressure. CONSTITUTION:At a process in which a car body is made to fall or the inclination angle of the car body is changed, a hydraulic pump 10 together with an engine 9 stalls in the case of the engine 9 having stalled due to an accident or the like and the closing of electromagnetic changeover valves 26L, R and 28L, R having been forgotten. And then, pilotage by means of discharge pressure disappears, so the electromagnetic coils of changeover valves 26L, R and 28L, R are energized, and even if these valves are in the state of having moved to the right side, pilot check valves 36L, R and 38L, R are automatically closed, and oil discharge passages 41L, R and 42L, R are closed, so the discharge of pressure oil from the cylinder head side of suspension cylinders 16L, R-19L, R is arrested, and the contraction of suspension cylinders and the falling of the car body, in its turn, are stopped automatically. |
