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METHOD FOR MAKING ACTUAL EXPANSION STROKE IN EXPANSION STROKE LONGER IN STROKE THAN ACTUAL COMPRESSION STROKE IN COMPRESSION STROKE IN THE CASE OF USING PISTON VALVE AND ROTARY VLAVE IN 4-CYCLE ENGINE OR 6-CYCLE ENGINE
METHOD FOR MAKING ACTUAL EXPANSION STROKE IN EXPANSION STROKE LONGER IN STROKE THAN ACTUAL COMPRESSION STROKE IN COMPRESSION STROKE IN THE CASE OF USING PISTON VALVE AND ROTARY VLAVE IN 4-CYCLE ENGINE OR 6-CYCLE ENGINE
PROBLEM TO BE SOLVED: To make the expansion stroke longer than the compression stroke by provid ing a valve and an intake port which are opened at the upper dead center and closed at the lower dead center in the intake stroke, and a valve and an intake port which are opened at the lower dead center and closed before the upper dead center in the compression stroke. SOLUTION: Engines are provided with two types of valves and intake ports. One type of valve and intake port are opened at the upper dead center and closed at the lower dead center in the intake stroke, and the other type of valve and intake port and opened at the lower dead center and closed before the upper dead center. By these two types of valves and intake ports, the stroke of the compression ratio expansion ratio is enabled. Further, space is provided at the tip of passage to two bypass of valves and intake ports, whereby at a next intake stroke, air-fuel mixture or air is reduced to a cylinder. Further, in the case of a 4-cycle engine and a 6-cycle engine, air-fuel mixture is reduced so as to improve fuel efficiency. The passages to the spaces of two types of valves and air ports are provided at the ends of the space, whereby air-fuel mixture or air flows in a fixed direction.
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