The latest motor bearing fatigue life theory

Generally speaking, the life of the motor bearing refers to the long service period in which the rolling bearing can continuously maintain the working performance and working accuracy that meet the active requirements under the actual service conditions (including working conditions, environmental conditions and maintenance and maintenance conditions, etc.).

The significance of this theory is not only that it provides a more reliable tool for predicting the life of modern bearings than the Imos life equation, but that it shows that the fatigue life of all rolling bearings has considerable potential for development, and demonstrates that exploiting this potential Therefore, it has a profound impact on the development, quality management and application technology of bearing products.

However, the infinity of bearings can only be "realized" under laboratory conditions, and such conditions are difficult to achieve and too expensive for bearings used in the field under certain working conditions.

When bearings are used in the field, their working load is often greater than their corresponding fatigue endurance limit load. After a certain period of work, sooner or later, the material itself will reach the electrical fatigue limit, resulting in fatigue spalling and can not continue to be used. Even if the working load of some bearings is lower than their corresponding permanent limit load, wear failure will occur due to the problem of bearing contamination that is difficult to eradicate. In short, the bearings used in the field are more or less always unable to fully meet the conditions that the above-mentioned laboratories have, and a slight deficiency in any one of the conditions will shorten the service life of the bearing, which will cause the bearing life problem.

According to the latest motor bearing fatigue life theory, a bearing of excellent design, excellent material, well-made and correctly installed. The material of this bearing will never fatigue damage as long as it is loaded lightly enough (not greater than a certain permanent limit load value corresponding to the bearing). Therefore, as long as the working environment temperature of the bearing is suitable and the change is not large, absolutely no solid dust, harmful gas and moisture intrude into the bearing, the lubrication of the bearing is sufficient and just right, the lubricant is absolutely pure and free of impurities, and will not age and deteriorate... , the bearing will run indefinitely.

1. Recognition by sound

Recognition by sound requires extensive experience. Sufficient training is required to recognize bearing versus non-bearing sounds. For this reason, the work should be carried out by dedicated personnel as much as possible. The sound of the bearing can be clearly heard by attaching a listening device or a listening stick to the housing.

2. Identify by working temperature

This method is a comparative identification method and is only used in situations where the operating state does not change much. For this, continuous recording of the temperature is necessary. In the event of a failure, the temperature not only increases, but also varies irregularly. It is advisable to use this method together with the voice recognition method.

3. Identify by the state of the lubricant

Sampling and analysis of the lubricant, through its degree of contamination, whether it is mixed with foreign matter or metal powder, etc. to judge. This method is especially effective for bearings or large bearings that cannot be viewed closely.