What are the advantages of using ultra-high speed integrated bearings in aircraft engines?

1. High load-bearing and high temperature resistance under special working conditions
The ultra-high speed integrated bearings of aircraft engines need to operate at a high speed of 150,000-180,000 rpm, while bearing high temperature and composite loads. The product uses tapered roller bearing design and surface strengthening coating, and the bearing can withstand the high acceleration and heavy load of the main shaft of the gas turbine engine. Mainstream bearing materials include 52100 chrome steel and M50 aviation steel. Some models use silicon nitride ceramics, which have a friction coefficient of only 1/3 of that of steel and a low thermal expansion coefficient, avoiding failure caused by gap changes at high temperatures.

2. Regulation of the lubrication system
Ultra-high speed integrated bearings combine the static lubrication of an external high-pressure gas source (such as nitrogen) with the dynamic pressure gas film generated by high-speed rotation to ensure stable lubrication during the initial startup phase and low friction power consumption under high-speed operation. In a vacuum or special temperature environment, molybdenum disulfide (MoS₂) or graphite is embedded in the bearing surface, and lubricating particles are released through friction heat to form a protective film to assist the main lubrication system.

3. Integrated design and dynamic stability
Ultra-high-speed bearings use an integral retainer and flange frame design to reduce assembly errors and adapt to dynamic load changes through dual clearance control (such as adjustable tapered sleeves). Based on the whole machine vibration model, the main bearing pitting, spalling and other fault characteristics are analyzed, and the multiple impact enhancement diagnosis method is combined to identify early damage.