| 摘要 |
PURPOSE:To improve the safety of a car by detecting the sharp application of brake which occurs the sinking of the front part of a chassis on a car and compressing a buffering hydraulic cylinder on the rear-wheel side and sinking the rear part of the chassis, thus preventing the forward inclination of the chassis. CONSTITUTION:When a crane car having a high center of gravity is applied with sharp brake through the stepping-in of a brake pedal 17 during travelling, a switch 19 interlocked with dapal is turned ON, and flow-rate selector valves 20a and 20b are switched to the state for throttling flow rate. Then, the extension and contraction speed of buffering hydraulic cylinders 5a and 5b is restricted, and the sharp foward-inclination of the chassis is prevented. Further, the front-wheel side cylinder 5a is compressed by the forward-inclination force of the chassis, and when the compression speed increases over a prescribed value, a main switch 22 is switched by the output of a differential-pressure detector 21, and a compression selector valve 12 is switched to the conduction state of a rear-wheel side cylinder compression line A. Therefore, the rear-wheel side cylinder 5b is compression-moved, and the rear part of the chassis is compulsorily sunk. |
