Bearing friction is very small, but their friction conditions are changing conditions, in the individual bearing series, in addition to the contact friction between the roller, there are different degrees of sliding friction, lubricating oil friction also exist. The heat caused by the friction affects the operating temperature of the bearing series.
Rolling rolling bearing rolling in the rolling friction generated, and sliding friction generated in the cage of the guide surface of the rolling body, the cage side of the guide surface and the roller bearing roller surface and the raceway between the wall. Lubrication friction is the lubricant between the worksheet, the bearings work in the internal friction caused by friction.