| 摘要 |
PURPOSE:To prevent a compressed air from returning into a suction system, by a method wherein, when operation of a number of cylinders control engine is shifted, stop of operation of an exhaust valve is caused to be more delayed than that of a suction valve, and restarting of operation of the suction valve caused to be is more delayed than that of the exhaust valve. CONSTITUTION:A locker arm 3 of a suction and exhaust valve 9 is mutually rotatably mounted to a locker shaft 4 through an inner and an outer bush position eccentrically to the locker shaft 4. The two bushes form a double eccentric circle cam which is moved and controlled by a link device 10 and a neumatic type actuator 20. When shifted to a reduced number of cylinders operation, with an electromagnetic valve 23 controlled, a high pressure air introducing pipe 22 is communicated with a pipe 24, and rods 21a and 21b are depressed to stop operation of the suction and exhaust valve, but the rod 21b on the exhaust side is more delayed in operation than that on the suction side with the aid of a buffer tank. When a valve is restarted, restarting, of the suction valve is more delayed, in a similar manner described above, than that of the exhaust valve through the working of the buffer tank. |
