| 摘要 |
PURPOSE:To prevent an oil column separation from occurring as checking prolongation of the time required for valve closing, by forming a valve stroke into a broken line type which differes in a valve closing speed between a part just before the closing and that of other sections. CONSTITUTION:Among all strokes, most of strokes S11 is quickly closed and a part S12 alone just before the closing is closed at low speed. The time t1 required for the whole stroke S0 in this case is the total amount of the required time t11 for the quick part and the required time t12 for the low speed part whereby it is apparently smaller than the required time t0 incase of the whole stroke S0 being closed at moderate speed. Doing like this, generation of an oil column separation at the downstream side of a valve is prevented from occurring, and an impact and/or a noise due to a reunion in the oil column separation is in no case generated and, what is more, the time required for closing the whole stroke is seldom or never prolonged. |
