Breakthrough in precision bearing research and development:speed increased by 50%, initially applied to the new turbofan 15 aero engine

Aeronautical bearings are one of the core components of aero-engines. They have the characteristics of high temperature, high speed, large load, complicated force, and harsh working environment. In theory, the most direct way to improve the thrust and fuel efficiency of aero engines is to increase the turbine inlet temperature and rotor speed. Increasing the speed has made the aero bearing's extreme speed performance, temperature resistance, lubrication performance and load carrying capacity all more severe Requirements. Although China's bearing industry has developed rapidly for many years, it has now become the third largest bearing country in the world in terms of bearing output and sales, but the key technology areas still need to be strengthened, especially the gap between the aerospace bearing technology and the first bearing is obvious. Can not meet the rapid development of China's aviation equipment models and performance requirements. According to public information, the life of China's advanced aviation bearing products is generally more than 8 times the calculated life (up to 30 times), and the reliability is more than 98%.

China's turbine engine spindle bearing life is generally about 500 to 1500 hours, the maximum temperature resistance height does not exceed 200 ° C, the transmission device oil cut emergency dry running capacity does not exceed half an hour. At the current research and development speed, it is expected that the bearing life will reach 3000 to 6000 hours in 2023, the temperature resistance value is 350 ° C, and the dry running capacity will exceed one and a half hours, and the actual performance is better than the above indicators.

According to public information, it is speculated that hybrid ceramic bearings have been initially applied in the field of China's new turbofan 15 aero engine and transmission. In order to improve the long-range effective strike capability of our naval vessels, a submarine-launched / ship-launched anti-ship missile has proposed design requirements for increasing range and speed. The missile turbine rotor must reach a rated speed of more than 120,000 rpm.

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