The method of mounting rolling bearings strongly affects their accuracy, working life and performance, so their mounting deserves careful attention. Their characteristics should first be thoroughly studied, and then they should be mounted in the proper manner. It is recommended that the handling procedures for bearings be fully investigated by the design engineers and that standard be established with respect to the following items:
1) Cleaning the bearings and related
parts.
2) Checking the dimensions and
related parts
3) Mounting
4) Inspection after mounting
5) Supply of lubricant
Bearings should be unpacked until immediately before mounting. When using ordinary grease lubrication, the grease should be packed in the bearings without first cleaning them. Even in the case of ordinary oil lubrication, cleaning bearing is not required. However, bearings for instruments or for high speed operation must be cleaned with clean filtered oil in order to remove the anti-corrosion .
After the bearings are cleaned with filtered oil, they should be protected to prevent corrosion.
Prelubricated bearings must be used without cleaning: Bearing mounting methods depend on the bearing type of fit. As bearings are usually used on rotating shafts, the inner rings require a tight fit.
Bearings with cylindrical bores are usually mounted by pressing them on the shaft (press fit) or heating them to expand their diameter (shrink fit). Bearings with tapered bores can be mounted directly on tapered shafts or cylindrical shafts using tapered sleeves.
Bearings are usually mounted in housings with a loose fit, However, in case where the outer ring has an interference-fitted by cppling them before mounting using dry ice. In this case, a rust preventive treatment must be applied to the bearing because moisture in the air condenser on its surface.
From: NSAR Bearings
Date:Spe. 07th, 2017