Bogie, as one of the most core technologies of railway vehicles, is also a traditional mechanical structure. For the first time, the design concept of “fully assembled welding-free flexible frame with multi-level stiffness” for rail vehicle bogies is put forward. The weight of bogies is reduced by 25%-35%, the energy consumption of train operation is reduced by about 15%, and the wheel-rail wear is reduced by more than 30%. The innovation design concept, advanced lightweight and energy-saving index fully demonstrate the original innovation ability of rail vehicle products in China, and will lead the future development direction of bogies.。。。。The new design improves the safety of bogie products. Compared to traditional technology, the product has significantly improved indicators such as derailment coefficient and wheel axle lateral force.The side beam adopts multi-level stiffness design. This design supports the train has high safety features when empty and loaded;The fram;Permanent magnet direct drive traction motor is adopted:e adopts flexible structure, which can better adapt to lines with bad conditions and improve the safety of train operation.;Sensors for monitoring temperature, vibration, load and dynamic performance are arranged for key components. The monitor for health status of bogies and vehicles can be performed.1) Without gearbox and coupling, the mechanical loss is reduced by 2.5%.2) Compared with the traditional traction system, the transmission efficiency of the permanent magnet traction system is improved by 2.5%.3) The axle box bearing is used as motor bearing. 14 sets of bearings for driving device are reduced for each bogie. The maintenance cost is low.Realize self-inspection of vehicle status, increase vehicle safety and reduce excessive maintenance.