How to Choose the Frictional Torque of the Bearings?

Frictional torque is a comprehensive use of rolling bearing performance, it is the result of a variety of factors, the influence of factors is quite complex. This has rolling friction, there is also sliding friction, there is a solid friction, there is also the viscous resistance of the lubricant, which brings great difficulty to the selection of the friction torque. Therefore, for the choice of bearing friction torque, here can only put forward some principle suggestions.

Bearing friction torque has the characteristics of multi-factor and randomness. In the practical application of bearings, several characteristic values of interest are the starting frictional moment, the average frictional moment and the rotational frictional moment. In general, in various bearing applications, the smaller the frictional torque the better, i.e., the better the rotational flexibility of the bearing, but there are different requirements for different applications. Continuous operation, general applications, only the average friction torque is small, frequent start or forward and reverse rotation of the bearing, the start torque is small, instrumentation bearings require not only the average friction torque is small, but also the start friction torque and rotational friction torque is small, while requiring the friction torque to maintain uniformity in the use of the process.

From the type of bearing, different structure type of bearing, the average friction coefficient is a certain difference. Generally speaking, the same size bearing, in the use of certain conditions, deep groove ball bearings, self-aligning ball bearings and single row cylindrical roller bearings, the friction torque is lower than other types of bearings, more suitable for low friction torque occasion use. In short, the choice of friction torque and use conditions are closely related, in accordance with the empirical formula for calculation, in order to determine the precise value of a bearing friction torque, must be measured to determine whether to meet the working conditions and use requirements.

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