This paper introduces the operating principles of the triangle piston circulating engine and puts forward the methods to create model line of cylinder and calculating formula.
介绍了三角活塞旋转发动机的工作原理，提出了气缸型线的创成方法和计算公式。
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In the 4-stroke engine, four strokes of the piston in the cylinder are required to complete one full operating cycle.