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Bearing installation
- Jan 12, 2019 -

Bearing installation

When installing the bearing, the bearing must be cleaned first. The new bearings are coated with anti-rust oil, and often contain a small amount of iron, ash and other debris; when not cleaned, it is strictly prohibited to turn by hand to avoid scratching the roller and raceway surface. Cleaning method: immerse the bearing in No. 2 spindle oil at 90~120 °C for 5~10 minutes, slightly swing, take out the dried anti-rust oil, immerse it in gasoline for several times, take it out and blow it dry with compressed air. Poor cleaning is one of the main causes of bearing heat and noise.

The bearing is mounted on the shaft and has two methods of cold pressing and hot setting. Cold pressing is only used for low-power motors, and hot-sleeve methods are generally used. The oil in the heating box is filled with oil or transformer oil, and the oil temperature is maintained at 90~100°C. The cleaned bearing is placed in the oil, heated for about 20 minutes, and then taken out and hot-sleeve on the journal. The heating temperature should not be too high, and the time should not be too long, so as to avoid the bearing tempering to reduce the hardness and affect the service life.

When hot-sleeve bearing, the bearing inner cover should be put on first and the journal and shoulder parts should be wiped clean. No burrs, patent leather or swarf are allowed. The heated bearing must be pushed all the way to the shoulder; if the sleeve is not in place The sleeve should be used to hold the inner ring of the bearing, and tapping the bearing with a hammer is strictly prohibited. The heat jacket can be carried out before and after the rotor is inserted into the stator.

After the bearing is installed, the grease fills the gap between the inner and outer rings of the bearing, and the gap in the bearing cap is only filled 1/3~2/3, which is not suitable to be overfilled. Too much grease or unclean grease often causes the bearing to heat up and leak oil.

When the bearing is removed, it must be pulled down smoothly with the pull bearing tool. The splint shoulder of the tool must bear against the inner ring, adjust the tie rod nut to make the surrounding force uniform, and then rotate the ejection screw to pull out the bearing.