In order to more accurately calculate the film stiffness of angular contact ball bearing, it is necessary to establish
the film stiffness calculation model that is consistent with reality. The frictional heat exists in high-speed ball bearings, and
can impact on oil film thickness and stiffness. The calculation model of film stiffness of an angular contact ball bearing
taking account of the effects of viscous heating was proposed based on the elastohydrodynamic lubrication theory. The
central film thickness and film stiffness have been determined. An example was calculated with this derived equation and
the result was compared with that given in other literatures. The calculation results show that the central film thickness
decreases and the film stiffness increases when friction heating are considered.