The invention discloses a dual-motor
hybrid power transmission system for medium and large tractors. The dual-motor
hybrid power transmission system comprises an engine, an intermediate shaft, a main motor, an auxiliary motor, a
power coupling device, a variable-speed transmission mechanism and a PTO output shaft, the double input ends of the
power coupling device are connected with the auxiliary motor and the main motor respectively, power of the main motor can be directly input into the
power coupling device, and power of the auxiliary motor is input into the power
coupling device through the intermediate shaft and the second
clutch. Total power is output to a PTO output shaft through an intermediate shaft and output to a variable speed transmission mechanism through a second row of planetary wheels, rotating speed
coupling of the engine and the double motors can be carried out through a power
coupling device, different driving
modes are achieved, the
system is compact and efficient in structure, the efficient and cooperative stepless speed regulation characteristic of multiple power sources is fully utilized, and the power efficiency is improved. The gear requirement of the system is reduced, the space cost is optimized, the
chassis specific power is remarkably improved, and the efficient transmission purpose is achieved; and under the high-load working condition, the engine is matched, and
power output is balanced.