| 摘要 |
<p>PURPOSE:To prevent overload of a hydraulic pump at the time of overrun by controlling an oil pressure control valve of a hydraulic cylinder of a clutch in a control circuit which generates a signal which suppresses oil pressure when rotating speed of engine exceeds the predetermined value. CONSTITUTION:Oil pressure of a hydraulic cylinder 1 of a hydraulic clutch is supplied by a hydraulic pump 2 and controlled by an oil pressure control valve 3. The control valve 3 performs program control in a control circuit 4. The control circuit 4 takes in oil pressure and rotating speed of engine from each sensor, controls a solenoid valve 6, and operates the oil pressure control valve 3 to reduce oil pressure of the hydraulic cylinder 1 when rotating speed of engine exceeds the predetermined value. Thus, it is possible to reduce oil pressure at the time of overrun and prevent excessive load of the hydraulic pump.</p> |
