Research background

The next-generation of 400 km/h high-speed railway gears will face even greater challenges, the vibration acceleration of the transmission system will increase by more than 30%, the maximum temperature rise will increase by more than 12℃, the service life of the lubricant will be reduced by more than 50%, the service life of the key rotating parts due to increased wear will be reduced by more than 10%, and the centrifugal force will increase by more than 30%. Traditional lubrication method is difficult to support the upgrading of high-speed railway gearbox technology and product iteration, there is an urgent need to develop a revolutionary technology of wear reduction and anti-wear technology.

Key technology

High quality and efficient removal of 1015 nm/min and Ra 0.65 nm surface roughness was achieved on the gear steel plane material, which laid a solid foundation for surface machining. In helical gear machining, the polishing path of helical gear is planned and the theoretical residence time is calculated to ensure the accuracy of the gear surface after polishing.

Application effects

According to the test results of National Institute Of Measurement And Testing Technology (China), the average surface roughness of the helical gear after polishing is reduced to 7nm. It lays a foundation for the application of solid-liquid coupling superlubricity technology in gear transmission system.