Some key points about the three-rotor engine

Three-rotor engine Comparison with traditional reciprocating engines: Reciprocating engines and Three-rotor engine Both rely on the expansion pressure generated by burning the air-fuel mixture to produce rotational force. The key difference between the two engines lies in how this expansion pressure is utilized.

In a reciprocating engine, the expansion pressure generated on the piston's top surface pushes the piston downward, transmitting mechanical force to the connecting rod and ultimately driving the crankshaft to rotate. Three-rotor engine , for Three-rotor engine The expansion pressure acts on the side of the rotor, pushing one of the three triangular rotor faces toward the center of the eccentric shaft. This motion occurs under the influence of two component forces: one is a centripetal force directed toward the center of the output shaft, and the other is a tangential force that causes the output shaft to rotate.

　　 Three-rotor The engine's motion is characterized by the following: the center of the triangular rotor rotates around the center of the output shaft, while the triangular rotor itself spins around its own central axis. As the triangular rotor turns, the internal gear ring at the center of the rotor engages with the gear attached to the center of the output shaft. This gear is fixed to the cylinder and remains stationary. The ratio of the number of teeth on the internal gear ring to those on the gear is… 3: 2. The aforementioned kinematic relationship causes the motion trajectory of the triangular rotor’s apex (i.e., the shape of the cylindrical wall) to resemble Figure 8. The triangular rotor divides the cylinder into three distinct chambers, each sequentially performing the processes of intake, compression, power generation, and exhaust. As the triangular rotor completes one full rotation, the engine fires and delivers power three times. Due to this unique kinematic arrangement, the output shaft rotates at three times the speed of the rotor—a mechanism entirely different from the 1:1 motion relationship found in conventional reciprocating engines between the piston and crankshaft.

　　 Three-rotor The engine's casing The internal space of the (or cycloid chamber) is always divided into three working chambers. As the rotor rotates, the volumes of these three chambers continuously change, allowing the intake, compression, combustion, and exhaust processes to occur sequentially within the oscillating cylinder. Notably, each process takes place at a distinct position inside the oscillating cylinder body—this is in stark contrast to reciprocating engines, where all four processes happen within a single cylinder.

　　 Three-rotor Engine displacement is typically expressed in terms of the unit working volume and the number of rotors. For example, for 13B-Type Dual Three-rotor engine , with a displacement of ‘654 cc2’.

　　 Three-rotor While the working volume of the engine changes and can be compared to that of a four-stroke reciprocating engine—both engines exhibit a steady, wave-like variation in their working chamber volumes—their differences are quite distinct. First, the rotational angles of each process: the reciprocating engine rotates 180 degrees, Three-rotor engine Rotation 270 degrees is 1.5 times the rotation of a reciprocating engine. In other words, in a reciprocating engine, the crankshaft (output shaft) completes two full rotations (720 degrees) during the four-stroke cycle; whereas in a rotary engine, the eccentric shaft rotates three times (1080 degrees), causing the rotor to complete one full rotation. Thus, Three-rotor engine This allows for longer processing times and smoother operation by reducing torque fluctuations. Additionally, even at high speeds, the rotor rotates relatively slowly, which helps to provide more relaxed intake and exhaust timing—further enhancing the system's ability to deliver superior dynamic performance.