| 摘要 |
PROBLEM TO BE SOLVED: To improve the output in an engine with air-fuel mixture or air expansion step longer by stroke than the actual compression step thereof by providing a valve or port opening at the bottom dead center and closing slightly before the top dead center in compression stroke. SOLUTION: When a piston valve is used for a 4-cycle gasoline engine, an intake valve 1 exclusive for air-fuel mixture, an exhaust valve 2, a valve 3 opening at the bottom dead center and closing slightly before the top dead center in compression stroke and an intake valve 4 exclusive for air opening in compression stroke and closing at the bottom dead center are provided. A supercharger 7 such as turbo charger, supercharger or the like and an intercooler 8 are interposed in the middle of an intake passage communicating with each intake port opened and closed by the air-fuel mixture exclusive intake valve 1 and the air exclusive intake valve 4. Further, an aspirator 9, a filter 10, a gasoline cleaner 1, and an air cleaner 12 are interposed in the passage communicating with a port opened and closed by the valve 8.
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