The combination of steady state thermal analysis and dynamic contact mechanics analysis was used to improve the calculation accuracy

and the stress distribution was corrected by thermal analysis

meanwhile the variation characteristics of the bearing were obtained. The research shows that

the maximum dynamic contact stress is located on the bearing ball surface

while the stress of the inner is the minimum. The contact stress of bearing has obvious dynamic response characteristics

while its distribution has a random variation. The contact stress

which increases with the rotational speed and the axial load

is composed of the principal stress and the shear stress.