To generate large output by allowing a flow only directed to a diameter contracted main combustion chamber when a diameter enlarged piston in which a diameter contracted piston is projected from the center of an arm-like recessed part, is positioned in a predetermined position in a heating process, and driving a double-end diameter enlarged piston by isolation combustion in the diameter contracted main combustion chamber.
Diameter contracted pistons having taper root parts 2 are projected in the approximately centers of the recessed parts 1 of the right and left diameter enlarged pistons of a double-end diameter enlarged piston, therefore the double-end diameter enlarged piston can be easily reciprocated between right and left dead centers in a cylinder, and normal exhaust and scavenging can be executed over before and after the right and left dead centers. At this time, in a compression process after scavenging, the isolation of a cylindrical diameter contracted main combustion chamber having a taper diameter contracted part 7 is started by a diameter enlarged piston in which a plurality of noise reducing grooves l'5 are arranged, and next, air compressed in a diameter enlarged combustion chamber is passed through a one-way air channel 4 including a check valve 3 and a plurality of slant air channels 14 and ' to the inside of the diameter contracted main combustion chamber. Then, air is mixed with fuel form fuel injection means 5 and burnt, so that power is generated.
TANIGAWA KAZUNAGA
TANIGAWA KAZUNAGA
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