| 摘要 |
PURPOSE:To improve the opening speed of a scavenging hole by providing a cylinder containing a differential pressure piston used as the driving actuator of a scavenging control valve and communicating actuating ports provided at both ends of the cylinder, with each other via a change-over stop valve, when the scavenging hole is opened. CONSTITUTION:According to a crank angle, a driving equipment makes an actuator 7 open and close a scavenging control valve 3 which opens and closes a scavenging hole 36 formed in a cylinder 1 of a Diesel engine, said actuator 7 being formed by a cylinder device which slidably contains a piston 40 having the rods at both ends inside its cylinder 37. One rod 41 of the piston 40 is joined with a scavenging control valve 3 and the other rod 42 capable of being coupled with a crankshaft via a link mechanism has a larger diameter than that of the rod 41. Ducts 43 and 44 which communicate to both oil pressure chambers 38 and 39 formed inside the cylinder 37 are communicated to each other by the third duct 45 which interposes therein, a change-over switch 46 opened when scavenging hole is opened, a pressure regulation valve 47 and a check valve 48. |
