The present invention in an engine having two cylinder chambers, promote the alternative introduction of two compressed gas to the cylinder chamber, the alternative simplification of the exhaust and on the structure of the two residual gas from the cylinder chamber .
An engine 10 includes an introduction path 34 for introducing the compressed gas into first and second cylinder chambers 14 and 16, and an exhaust passage 36 for exhausting the residual gas of the first and second cylinder chambers 14 and 16 a. The engine 10 includes a first and second cylinder chambers 14 and 16, provided between the inlet passage 34 and exhaust passage 36, based on the first and second stroke, the first and second cylinder chamber 14 , 16, and having a switching valve 38 for switching a connection relationship between inlet passage 34 and an exhaust passage 36.
.FIELD 1