This application relates to the technical field of
hybrid vehicle transmissions, and discloses a
hybrid transmission drive
system, which includes an engine and a generator, a
drive motor, and a differential arranged around the engine. By integrating the
drive motor rotor shaft and the differential coaxially, an independent shaft
system is eliminated, and the overall volume is reduced, forming a compact four-shaft
layout, which is suitable for small vehicles and solves the problem of the
layout of traditional five-shaft transmissions; the
drive motor rotor shaft and the first-stage driving gear, and the generator rotor shaft and the power generation driven gear are respectively designed coaxially as a whole, reducing spline fits, improving transmission efficiency and stability, and extending the service life of components; the coaxial design of the drive motor and the differential allows the
lower half of the motor to be immersed in the oil, achieving dual optimization of
lubrication and cooling, reducing temperature rise, fully lubricating the bearings, and improving
motor efficiency; the shaft
system is streamlined to 4, the total number of components is reduced, the volume and weight of the housing are reduced, the manufacturing cost is decreased, and maintenance is more convenient.