| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for adopting a real expansion ratio larger than a real compression ratio when using a piston valve (reciprocating valve) or a rotary valve (rotary valve) for a 4-cycle, 6-cycle, 8-cycle, or 10 or more-cycle engine. SOLUTION: A valve (piston valve) or a blow hole (rotary valve), when opened at a bottom dead center during a compression stroke, followed by the expansion of a mixture or an air with explosion (combustion) during an expansion stroke, to be closed before too much expansion resulting in rotating resistance (the piston is lowered to make an air pressure 1 or less and form resistance to the rotation of a crank shaft), is provided to permit the mixture or the air entering the valve or the blow hole to be returned to a mixture suction pipe or an air suction pipe, respectively.
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