Single-engine co-transmission-shaft four-rotor tilting unmanned aerial vehicle transmission system and rotor aircraft

The invention relates to a single-engine co-transmission-shaft four-rotor tilting unmanned aerial vehicle transmission system and a rotor aircraft, the single-engine co-transmission-shaft four-rotor tilting unmanned aerial vehicle transmission system comprises an engine output, the engine output is connected to a middle speed reduction unit and is connected with left and right speed reduction reversing units through two groups of coaxial horizontal transmission shafts, and the four speed reduction reversing units are finally connected with four rotors respectively; according to the transmission system, one engine is adopted for output, power is transmitted to the four speed reduction reversing units which are symmetrical left and right through the middle speed reduction unit and the two sets of coaxial horizontal transmission shafts, and finally the power is transmitted to the rotor wings, so that single-power input and four-direction power output are achieved; according to the configuration design of the sin