| 摘要 |
<p>PURPOSE:To permit smooth acceleration with no adverse effects upon the tubing by permitting torque control through free control of the oil hydraulic circuit pressure by operating a lever at the time of acceleration as in a mechanical system. CONSTITUTION:A main releaf valve 5 which is capable of readjusting set pressure, and a directional control valve 2 are provided between a discharge pipe 11 of an oil hydraulic pump 1 and an operating fluid pipe 13. The oil hydraulic pressure from the oil hydraulic source 30 is converted by an operating valve 3 into a secondary pressure and then led into the main releaf valve 5 and directional control valve 2. Thus, the main releaf valve controls the pipe pressure. The motor 4 is thus accelerated by the pipe pressure corresponding to the angle of the lever 31. By setting the lever 31 neutral, the return oil is led to an overload releaf valve to apply brake to the motor 4.</p> |
