How to Mount Bearings
When bearings are mounted incorrectly the balls will cause brinelling on the raceway and undermine bearing performance and life. Brinelling (dents) as small as 0.1micron in depth will have an adverse effect on acoustic noise levels as well as causing increased torque.
Several general rules apply to mounting bearings. When assembling a bearing on its shaft or in a housing, it is critical that no force be applied to the balls. When mounting a bearing to a shaft always press the inner ring. When mounting into a housing press the outer ring. Never apply force to the outer ring when mounting to a shaft or to the inner ring when mounting into a housing. Never apply a shock load in either case.
1. When manually fitting a shaft into a bearing through its bore do not force the shaft because it may cause brinelling to the bearing.
2. After gluing a bearing to a housing using a guide through the bearing bore take the guide out very carefully or it may cause brinelling to the bearing.
3. When motors are being assembled bearings may be attracted by the magnet and hit something causing brinelling. To avoid this, hold the motor shaft in your palm and cautiously insert the rotor. For automated assembly, use an air cylinder and steadily operate the assembly. Bearings are easily affected by shock forces. In the case of NMB P/N L-940ZZ, for example, brinelling would begin when a 100 gram weight was dropped
4. Brinelling would also occur when bearings are automatically press-fitted to a rotor shaft if the shaft and bearing bore are not kept accurately in line through their bore.
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Author：mosbearing 2008-10-6 Source: View(525) Comment(0)