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Abstract

A dual-rotor engine comprises a cylinder assembly, a transmission output mechanism, a rotor control mechanism and a lubrication system. The cylinder assembly comprises a tubular cylinder (6) and two rotors (1a, 1b). Each of the rotors (1a, 1b) comprises an inner cylindrical cylinder (99a, 99b), a rotor journal (20a, 20b) integrated with the inner cylindrical cylinder (99a, 99b) and two sector pistons (17a, 17b) symmetrically secured to the inner cylindrical cylinder (99a, 99b); four sector pistons (17a, 17b) of two rotors (1a, 1b) are arranged crosswise to each other, and two adjacent sector pistons (17a, 17b) form a combustion chamber. The transmission output mechanism comprises two rotor gears (2a, 2b) and two driving gears (3a, 3b) which engaged with each other respectively. Each rotor gear (2a, 2b) has two symmetrical toothless portions (24) on its periphery; the length and the shape of the toothless portions (24) are the same with those of the portions where the rotor gears (2a, 2b) engage with the driving gears (3a, 3b); the teeth numbers of two toothed segments of the rotor gears (2a, 2b) are equal and the teeth profiles at the start positions of two toothed segments are the same. The rotor control mechanism controls the interval rotation, the stop rotation, the rotating time and the stopping time of two rotors (1a, 1b) to ensure a uniform and smooth power output.

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