Fig. 1. Vertical shaft based on angular contact ball bearings

Fig. 2. Gap design of vertical shaft

Fig. 3. Theoretical pressing force model of single nut bolt

Fig. 4. Pressing model of bearing outer ring

Fig. 5. Boundary conditions and nut bolts' pressing force

Fig. 6. Pressing force of bearing outer ring 轴承外圈压紧力

Fig. 7. Deformed cloud diagram of outer end ring

Fig. 8. Deformed cloud diagram of outer end ring (×10)

Fig. 9. Deformed cloud diagram of bearing outer ring I

Fig. 10. Design optimization flow

Fig. 11. Relation between 关系曲线图

Fig. 12. Relation between 关系曲线图

Fig. 13. Relation between 关系曲线图

Fig. 14. Initial state of rotation center axis

Fig. 15. State of shafting after instability

Fig. 16. Three contact conditions under ideal conditions

Fig. 17. Displacement monitoring of shaft with partial load

Fig. 18. Elimination of bearing clearance under Condition II

Fig. 19. Hoisting under partial load