Do the inspection after the bearing is installed

Whether the TIMKEN bearing is installed correctly or not has a direct impact on its life and the accuracy of the main engine. If it is installed improperly, the bearing will not only have vibration, high noise, low accuracy, and large temperature rise, but also the danger of being stuck and burned; on the contrary, if it is installed properly, it will not only ensure accuracy, but also greatly extend its life. Therefore, after the bearing is installed, it must be inspected.

The key inspection items are as follows:

1. Check the installation location

After the bearing is installed, first check whether the moving parts and the fixed parts collide, whether the lubricating oil can flow into the bearing smoothly, and whether the sealing device and the axial fastening device are installed correctly.

2. Check the radial clearance

Except for the installation of bearings with pre-interference, the radial clearance should be checked. Deep groove ball bearings can be tested by hand rotation, so that they are stable and flexible, without vibration, and without side-to-side swing. Cylindrical roller and spherical roller bearings can be inspected with a feeler gauge. Insert the feeler gauge between the roller and the bearing ring. The insertion depth of the feeler gauge should be greater than 1/2 of the length of the roller.

When the radial clearance of the bearing cannot be measured with a feeler gauge, the displacement of the bearing in the axial direction can be measured instead of the reduction in the radial clearance. Under normal circumstances, if the inner ring of the bearing is a conical hole, the axial movement on the conical surface is about 15 times the radial clearance reduction.

The radial clearance of the bearings can be adjusted after installation, such as angular contact ball bearings and tapered roller bearings; some have been adjusted in accordance with the standards during manufacturing, and cannot be adjusted after installation. Such as deep groove ball bearings, self-aligning ball bearings, cylindrical roller bearings, spherical roller bearings, etc.

If this type of bearing is unqualified after installation and the radial assembly clearance is too small, it means that the matching selection of the bearing is improper or the assembly part is processed incorrectly. At this time, the bearing must be removed, the cause must be found out, and it must be eliminated and reinstalled. Of course, the bearing clearance is too large.