Using the theory for two rotating cylinders in contact obtained in Part I, the fluid lubrication theory of roller bearings for Newtonian and non-Newtonian lubricants was developed in Part II with considerations of the influences of unsteady load and sliding of rollers. It is clarified that the load capacity under unsteady load is generally larger than that under constant basic load and the average friction is nearly equal for both cases. The frictional moment and load capacity for roller bearing including sliding of rollers decrease to 2/3 of the amount of those for roller bearing including no sliding.

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