When the bearing rotates, the raceway surface of the inner ring and outer ring of the thrust ball bearing is in rolling contact with the rolling elements, so the running track is a dark surface, and the running track is attached to the raceway surface.
Whether the thrust ball bearing is installed correctly affects the accuracy, life and performance. Therefore, the design and assembly departments should fully study the installation of bearings. It is expected that the installation will be carried out according to the working standard. Items of working standards are usually as follows:
(1), cleaning bearings and bearing-related parts
(2) Check the size and finishing of related parts
(3), installation
(4) Inspection after installing the bearing
(5), supply lubricant
Just before installation, unpack the bearing. General grease lubrication, no cleaning, directly filled with grease. Lubrication with lubricating oil generally does not need to be cleaned, however, bearings for instruments or high speeds, etc.,
Wash it with clean oil to remove the anti-rust agent applied to the bearing. Bearings with anti-rust agent removed are prone to rust, so they cannot be placed in the air. Bearings that have been sealed with grease can be used without cleaning.
The installation method of the bearing varies with the bearing structure, fit, and conditions. Generally, since the shaft is mostly rotated, the inner ring needs an interference fit. Cylindrical bore bearings are mostly pressed in with a press, or hot-packed. In the case of a tapered hole, install it directly on the tapered shaft, or install it with a sleeve.
When installing to the shell, generally there is a lot of clearance fit, and the outer ring has an interference, which is usually pressed in with a press, or there is also a shrink fit method for installation after cooling. When dry ice is used as the coolant and the shrink fit is installed, the moisture in the air will condense on the surface of the bearing. Therefore, appropriate anti-rust measures are required.
If you look carefully at the running track, you will know that it only bears radial loads, bears large axial loads, bears moment loads, or has extreme rigidity unevenness on the bearing housing. It can be checked whether an unexpected load is added to the bearing and whether the installation error is large, etc., and it becomes a clue to investigate the cause of TIMKEN bearing damage.