METHOD FOR PERFORMING LONGER STROKE AT REAL EXPANSION STROKE TIME THAN AT REAL COMPRESSION STROKE TIME WHEN PISTON VALVE AND ROTARY VALVE ARE USED IN 4-CYCLE ENGINE AND 6-CYCLE ENGINE

摘要

PROBLEM TO BE SOLVED: To transmit energy by an explosion to a piston sufficiently or plenty as much as possible by arranging two kinds of valves and air ports of a valve and an air port which open in the upper dead center and close in the lower dead center at intake stroke time and a valve and an air port which open in the lower dead center and close before the upper dead center at compression stroke time. ;SOLUTION: In case of a 4-cycle engine, three rotary valves 12 to 14 are used. The rotary valve 12 is formed in a cross-sectional H shape, and is provided with an intake port 32 exclusive to an air-fuel mixture and an exhaust port 33, and the rotary valve 13 is formed in a cross-sectional H shape, and is provided with an air port 34 which opens in the upper dead center and closes in the lower dead center at intake stroke time and an air port 35 which opens in the lower dead center and closes before the upper dead center at compression stroke time. The rotary valve 14 is provided with an air port 35 which opens in the lower dead center and closes before the upper dead center at compression stroke time, as a measure against excessively opening time, and an air exclusive intake port 36 which opens before becoming rotational resistance when it excessively expands and closes in the lower dead center at expansion stroke time. Therefore, the ratio of (the compression ratio the expansion ratio) becomes high.;COPYRIGHT: (C)1998,JPO