Inspection is essential after the double thrust bearing is installed

After the double thrust bearing is installed, it must be inspected. The correctness of the bearing installation has a direct impact on its life and the accuracy of the host.

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

The radial clearance of the double thrust bearing can be adjusted after installation, such as angular contact ball bearings and tapered roller bearings; some have been adjusted according to the standard during manufacturing, and they cannot be adjusted after installation. Such as deep groove ball bearings, self-aligning ball bearings, cylindrical roller bearings, spherical roller bearings, etc.

3. Check the tightness of the double thrust bearing and the shaft shoulder

Under normal circumstances, a bearing fitted with a tight fit interference must be close to the shaft shoulder. Testing method:

(1) Lighting method. That is to say, aim the light at the bearing and the shaft shoulder, and judge the light leakage. If there is no light leakage, it means the installation is correct; if there is even light leakage around the shaft shoulder, it means the bearing is not close to the shaft shoulder, pressure should be applied to the bearing to make it close; if there is some light leakage, it means the bearing installation is inclined, and a hand hammer or copper rod can be used Or the sleeve knocks on the inner ring of the bearing and slowly settles.

(2) Thickness gauge inspection method. The thickness of the thickness gauge should start from 0.03mm. During the inspection, try to insert several places on the entire circumference of the bearing inner ring end face and the shaft shoulder. If there is a gap and it is very uniform, it means that the bearing is not installed in place. The bearing inner ring should be pressurized to make it close to the shaft shoulder; if it is enlarged The pressure is not tight, indicating that the rounded corners of the rounded part of the journal are too large and the bearing is stuck. The rounded corners of the journal should be trimmed to make it smaller; Passed, indicating that it must be disassembled, repaired, and reinstalled at this time.

If the double thrust bearing is installed in the bearing housing hole with an interference fit and the outer ring of the bearing is fixed by the housing hole shoulder, whether the end face of the outer ring and the housing hole shoulder end face are tight and whether the installation is correct can also be checked with a thickness gauge.

4. Inspection after installation of double thrust bearing

When installing the double thrust bearing, check the verticality of the shaft ring and the shaft center line. The method is to fix the dial indicator on the end face of the case, make the contact of the indicator rest on the raceway of the bearing shaft ring while rotating the bearing while observing the dial indicator pointer. When the box shell hole is deep, it can also be inspected with an extended dial gauge.

When the double thrust bearing is installed correctly, its seat ring can automatically adapt to the rolling of the rolling elements to ensure that the rolling elements are located in the upper and lower ring raceways. If it is installed backwards, not only the bearing will not work properly, but also the mating surfaces will be severely worn. Since the difference between the shaft ring and the seat ring is not very obvious, you should be extra careful during the assembly and make no mistake.

In addition, there should be a gap of 0.2-0.5mm between the seat ring of the double thrust bearing and the bearing seat hole to compensate for the errors caused by inaccurate parts processing and installation. When the center of the bearing ring shifts during operation, this gap It can be ensured that it is automatically adjusted, avoiding contact and friction, and making it work normally. Otherwise, it will cause severe damage to the bearing.

5. Check whether the bearing noise, temperature rise, and vibration meet the requirements

Generally, the working temperature of the bearing should be lower than 90℃. If the temperature is too high, it will cause the bearing to heat and anneal or burn out, which will reduce the service life.

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