円錐ころ軸受の耐振性解析

抄録

The purpose of this study is to evaluate strength of tapered roller bearing loaded vibrations. We modeled the tapered roller bearing to the flexible multi-body model, and calculated the stress of retainer by mechanical simulation. The simulation result shows that the stress of retainer became large when rollers vibrate in yaw motion, and the largest part of the stress was the root of retainer bridge. And we evaluated fatigue strength based on the calculated stress of retainer by this simulation. However, such a simulation using a flexible multi-body model had a problem to take a lot of time. So, we could not calculate the stress in various conditions. For this problem, we confirmed that the major frequency of the stress in the root of the retainer bridge is below the first natural frequency of the retainer. We found that this simulation can be calculated by the solid body model to save time. And we calculated the stress in the root of bridge per unit force by the static analysis. Therefore, we became able to calculate this stress by the force calculated by the solid body model analysis. Using this solid body model, we calculated the force between the retainer and rollers in various conditions. We found this force increased depending on vibration acceleration, rotation speed of inner race, and radial force though it didn't increase depending on rotation direction of inner race. And we found the fatigue failure vibration acceleration of the tapered roller bearing.