Patent ID: 8037861

Claim:
A rotary engine, which comprises: an engine housing having a combustion cavity formed therewithin, wherein said engine housing has an exhaust outlet and an air inlet; first and second engine rotors concentrically and rotatably mounted in said combustion cavity, wherein each of said first and said second engine rotors comprises a plurality of rotor blades spacedly provided within said combustion cavity to divide said combustion cavity into four combustion chambers; a fuel-supply device communicated with said engine housing for supplying a predetermined amount of fuel; and a support structure, which comprises: an actuation device for transferring an externally applied force to said first and said second engine rotors for initiating a rotation thereof in a predetermined direction, wherein said actuation device comprises: a power device connected with said second engine rotor to transfer a rotational force thereto; and a rotor locker coupled with said first and said second engine rotor to temporarily lock up one of said first and said second engine rotor, wherein when said unlocked engine rotor rotates to a predetermined unlocked location, said locked engine rotor is unlocked, while said originally unlocked rotor is subsequently locked by said rotor locker until said unlocked engine rotor moves to said predetermined position again, wherein said rotor locker is arranged to lock one of said first and said second engine rotors when said rotary engine is an initialization stage, so that when said rotational speed of said first and said second engine rotor reaches a predetermined threshold, said rotor locker ceases to function; a power output device connected with said first engine rotor for outputting power thereto; and a locking device which is arranged to prevents at least one of said engine rotors from rotating against said predetermined direction, and comprises an electromagnetic device comprising an electromagnet and a metallic element coupled with said first and said second engine rotor, such that when each of said first and said second engine rotor rotates toward each other for air and fuel compression, electric current is applied to said electromagnet for inducing a corresponding magnetic force to said corresponding metallic element so as to prevent said first and said second engine rotor from rotating in a reverse direction, wherein a mass of said first engine rotor is greater than a mass of said second engine rotor, and said locking device is coupled with said second engine rotor, wherein said second engine rotor is capable of increasing or decreasing a rotational speed easier than the first engine rotor.