Preload selection for rolling bearings

Many times, our customers want to understand how to select a proper preload for their bearing design? Now we will give a simple review about the bearing preload.What Is bearing preload?Bearing Preload is an axial or thrust load applied to a bearing that removes excess play. There are many ways to apply preload, as well as many benefits. But there are potential problems with preload which needs a lot of expertise carefully dealing with them. Depending on the bearing type, preload may be either radial method or axial method.How much preload do bearings need?The best preload for a system should be determined based on a bearings size and the system's required specific parameters which like stiffness, starting torque, life, and loading parameters etc., Excessive preload can cause increased heat, fatigue, and torque. Insufficient preload will cause fretting on the raceways. A bearing with proper preload applied will provide system rigidity, reduced vibration, and optimal bearing life. Are there different types of preloads and how to apply preload on bearings?There are two main methods to apply a preload on bearing. The first is solid preload which is achieved by holding inner and our races in place with a locking system mechanism. The more common method is applied preload with spring to apply a constant axial load on one side of bearings. The constant pressure preloading from a spring provides necessary preload force between the inner or outer races. The simple preload added by spring will also compensate for any tolerance stack-ups or thermal misalignments. Therefore, the play is reduced both axially and radially. In general, the rigidity of the preloaded spring is generally much smaller than the rigidity of the bearing, so the relative position of the constant pressure preloaded bearing will change a little in use, but the preloaded amount is roughly the same. Preload considerationsPreload can be either radial or axial. For example, cylindrical roller bearings, can be preloaded radially only, and the thrust ball and cylindrical roller thrust bearings can be preloaded axially only. Deep groove ball bearings can also be preloaded axially. Single row angular contact ball bearings and tapered roller bearings are generally preloaded axially by mounting them against a second bearing of the same type and size in a back-to -back or face- to- face arrangement. But the preloads for angular contact ball bearings, tapered roller bearings are somehow complicated, please contact us and directly with our technical team for the free design assistance. We are more than happy with you.Pls feel free to contact us If you have any bearing question. E-mail:[email protected] or [email protected]

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