In order to resolve the failures of cylindrical roller bearings under the condition of high DN(bearing inner diameter×inner speed)

high DN cylindrical roller bearings were developed. Based on the design criteria of bearings

the structural parameters optimization design and material selection for cylindrical roller bearings to 3 million DN were carried out. Based on the dynamic theory of bearings

the dynamic model of bearings was established and simulated. The dynamic behaviour for cylindrical roller bearing to 3 million DN was investigated; finally

the bearing test was carried out on the self-developed testing machine to verify the rationality of the structural parameters and material selection for cylindrical roller bearing to 3 million DN. During the test

the temperature rose and vibration acceleration of the bearing was monitored. Result showed that when DN was 3 million

the temperature was lower than 130 ℃ and vibration acceleration was lower than 20g. Through optimized design

the DN of cylindrical roller bearing has increased from 2 million to 3 million.