Purpose -The purpose of this study is to investigate the thermal elastohydrodynamic lubrication (TEHL) analysis of a deep groove ball bearing. Design/methodology/approach -The TEHL model for the groove ball is first established, into which the elastic deformation is incorporated. In doing so, the elastic deformation is solved with the fast Fourier transform (FFT). And the bearing temperature rise is solved by the point heat source integration method. Then, effects of the applied load, relative velocity and the slide-roll ratio on the TEHL of the bearing are analyzed. Findings -There exist the large pressure peaks at two edges of the raceway along its width direction and the increment in the relative velocity between the roller and the raceway, or one in the slide-roll ratio arguments the temperature rise. Originality/value -This study conducts a detailed discussion of the TEHL analysis of deep groove ball bearing and gives a beneficial reference to the design and application of this kind of bearings.

The elastohydrodynamic lubrication model for the ellipsoid contact considering three-dimensional crack effect is established and solved with an under-relaxation algorithm. In doing so, the fluid field is divided into the two computation domains, in which the usual Reynolds equation and its reduced form are solved for the film pressure with the crack effect. Meanwhile, a fast Fourier transform method is adopted to accelerate the deformation calculation. Simulation model is verified. Numerical results show that the crack can cause jumps for the film pressure and film thickness. Increasing the crack length along the rolling direction and the depth at the crack's open end, and decreasing the crack tip inclined angle all result in an increment in the maximum film pressure. In addition, increasing the crack width can make the film pressure within the crack shift towards both ends of the crack width. The crack close to the contact center brings out a large film pressure.