Rotary internal runway type rotary engine

The utility model relates to a rotary engine in a rotary internal slideway. The reciprocating motion of a piston in the rotary internal slideway realizes the four-stroke movement of piston engine, namely, inspiration, compression ignition, doing work and exhausting. The engine adopts a cone gear mechanism to realize two opposite rotation and respectively controls the rotation of the internal slideway and the reciprocating motion of the piston by the two opposite rotation and the piston is driven by a cam to do reciprocating motion in the internal slideway. The utility model avoids the problem of difficult sealing caused by the wear between the piston and a cylinder higher pair in the prior rotary engines and at the same time, cancels a connecting rod, an inlet valve and an exhaust valve in common piston engines. The design also shows that the engine can realize direct two reverse output and a plurality of working stroke in a circumference. The utility model can be power for various vehicles, ships and construction machinery.