| 摘要 |
<p>PURPOSE:To obtain tenacious instantaneous starting output power, by heightening the relief pressure of a main relief valve above the rated pressure of a circuit only for a short time. CONSTITUTION:Changeover valves 20, 21 and a back pressure pump 22 are connected to the secondary side of a main relief valve 13. A controlling changeover valve 17 and a delay nullification changeover valve 18 are connected to a cylinder 16 for operating the changeover valve 20. The relief pressure of the valve 13 is heightened above a rated level for a prescribed short time, and then automatically returned down to the rated level. The torque of an engine is thus temporarily increased over a rated level by the inertial force of a flywheel, and returned to the rated torque curve before reaching the maximum point, so that tenacious instantaneous starting output power is obtained.</p> |
