What is the difference between a rotary engine and a traditional reciprocating engine?

[Alex]

The differences between a rotary engine and a reciprocating engine: 1. Different expansion pressure: The expansion pressure of a rotary engine acts on the sides of the rotor, with the three faces of the rotor pushing toward the center of the eccentric shaft; the expansion pressure of a reciprocating engine pushes downward, transmitting mechanical force to the connecting rod to drive the crankshaft rotation. 2. Different motion processes: The rotary engine completes the four processes of intake, compression, combustion, and exhaust within a trochoidal housing; the reciprocating engine performs all four processes within a single cylinder. The displacement of a rotary engine is typically expressed using the unit working chamber volume and the number of rotors. Unit working chamber volume refers to the difference between the maximum and minimum volumes of the working chamber; the compression ratio is the ratio of the maximum volume to the minimum volume. The same definitions are used for reciprocating engines.