Is the smaller the radial clearance of the bearing the better?

Not all bearings require a minimum working clearance, you must choose the appropriate clearance according to the conditions. In the national standard 4604-93, the radial clearance of rolling bearings is divided into five groups—2 groups, 0 groups, 3 groups, 4 groups, and 5 groups. The clearance values are in order from small to large, and group 0 is the standard clearance.

The basic radial clearance group is suitable for general operating conditions, normal temperatures and commonly used interference fits; bearings that work under special conditions such as high temperature, high speed, low noise, and low friction should use large radial clearance; Bearings for precision spindles, machine tool spindles, etc. should use a small radial clearance; for roller bearings, a small amount of working clearance can be maintained.

In addition, there is no clearance for separate bearings; Finally, the working clearance after installation of the bearing is smaller than the original clearance before installation, because the bearing has to withstand a certain load of rotation, and the bearing coordination and load generated The amount of elastic deformation.