Bearing installation


Whether the bearings are installed correctly affects ac […]

Whether the bearings are installed correctly affects accuracy, life, and performance. Therefore, the design and assembly department should fully study the bearing installation. Hope to install according to the operation standard. The work standard items are usually as follows:
(1) Cleaning bearings and bearing related parts
(2) Check the dimensions and finishing of related parts
(3) Installation
(4) Inspection after installing the bearing
(5) Supply lubricant
It is hoped that the bearing packaging will be opened just before installation. General grease is lubricated and filled with grease directly without cleaning. Lubricating oils do not need to be cleaned in general. However, bearings for instruments or high-speed bearings should be cleaned with clean oil to remove the anti-rust agent applied to the bearings. Bearings with the anti-rust agent removed are prone to rust, so they cannot be left alone. Furthermore, bearings that have been sealed with grease are used without cleaning.
Bearing installation methods vary depending on the bearing structure, fit, and conditions. Generally, since most of them are shaft rotations, the inner ring needs an interference fit. Cylindrical bore bearings are usually pressed in with a press, or hot-packed. In case of tapered hole, install it directly on the taper shaft, or install it with a sleeve.
When installed to the shell, there is usually a large amount of clearance fit, and the outer ring has an interference amount. It is usually pressed in with a press, or there is also a cold shrink fit method for installation after cooling. Dry ice is used as a coolant, and when shrink-fitting is installed, the moisture in the air will condense on the surface of the bearing. Therefore, appropriate anti-rust measures are required.