| 摘要 |
PURPOSE:To make compact the entity by providing a power chamber as a volume chamber for communicating through a gate valve with an exhaust port while providing an actuator such as an exhaust port open/close timing control valve in said power chamber. CONSTITUTION:A power chamber 8 is communicated through a gate valve 11 with an exhaust port 7 and opened/closed according to the operating condition of engine so as to improve the scavenging efficiency through proper pulsating exhaust effect. An actuator for an exhaust port open/close timing control valve 13 which opens/closes the upper edge section of an opening 5 of the exhaust port according to the operating condition of engine is constructed in the power chamber 8. Furthermore, a coupling section with a rotary shaft, a lever 16 and a rod 14 is also arranged. Since an actuator is arranged in the power chamber, the space can be utilized effectively.
|
