When the deep groove ball bearing rotates, the raceway surfaces of the inner and outer rings of the deep groove ball bearing are in rolling contact with the rolling elements, so the running trajectory is a dark surface. The running trajectory attached to the raceway surface is not abnormal, which can indicate the load conditions. Therefore, when disassembling the deep groove ball bearing, please pay close attention to and observe the running trajectory of the raceway surface. If you carefully observe the running trajectory, you will know that it only bears radial loads, bears large axial loads, bears torque loads, or has extreme uneven rigidity on the bearing box. It can be used to check whether unexpected loads have been applied to the bearings and whether installation errors have occurred, and become a clue to investigate the cause of bearing damage.

Proper installation of deep groove ball bearings is a guarantee for extending their service life. Many people do not have professional knowledge in this area and may not install them properly, which can easily lead to improper bearing installation and mechanical operation accidents. As a professional mechanical maintenance engineer, it is essential to have a good understanding of bearing installation. Generally speaking, the installation of bearings is determined by the structure, size, installation parts, and cloud like properties of deep groove ball bearings. When installing, pay attention to applying pressure directly on the surface of the ring, and it must be applied vertically. Pressure cannot be applied by rotating the rolling elements. The commonly used methods for bearing installation are as follows:

The fitting method between the bearing ring and the shaft is mostly transitional fitting, and the fitting between the bearing seat ring and the bearing seat hole is mostly clearance fitting. This fitting method is generally easy to install. The central axis of the bearing should be fixed on the shaft to avoid unnecessary wear caused by the relative rotation of the rings. In terms of the installation method of bearings here, there are more rotating installation methods, which can make the inner ring fit tighter.

When the outer ring of the bearing is loosely matched with the bearing seat, and the inner ring is tightly matched with the shaft, a professional press used for installing deep groove ball bearings can be used to press the bearing onto the shaft first, and then install it together with the shaft and bearing into the bearing seat. When installing under pressure, pay attention to punching the surface of the bearing inner ring, and then pad it with a soft metal sleeve made of copper or soft steel. When assembling the sleeve with an inner diameter larger than the shaft neck diameter and an outer diameter smaller than the inner ring edge, avoid pressing it on the retainer.

The inspection results can be judged by those who are familiar with bearings or proficient in bearings.

The criteria for judgment vary depending on mechanical performance, importance, and inspection cycle. If there are the following damages, deep groove ball bearings cannot be reused and must be replaced.

1) Fracture and defects of bearing components.

2) Stripping of the rolling surface of the track material.

Methods for identifying faults in bearings

It is crucial to identify or predict the presence of faults in bearings during operation without disassembling and inspecting them, in order to improve productivity and economy.

The main identification methods are as follows:

1) Recognition through sound

Recognition through sound requires extensive experience. It must undergo sufficient training to be able to recognize bearing sounds and non deep groove ball bearing sounds. Therefore, it is advisable to assign a dedicated person to carry out this task as much as possible. By attaching a listening device or listening stick to the casing, the sound of the bearings can be clearly heard.

2) Identification through working temperature

This method belongs to the comparative recognition method and is only applicable in situations where the operating state does not change significantly. For this, continuous temperature recording is necessary. When a malfunction occurs, not only does the temperature rise, but irregular changes also occur.

3) Identify by the state of the lubricant

Sample and analyze lubricants to determine their degree of contamination by whether foreign objects or metal powders have been mixed in. This method is particularly effective for deep groove ball bearings or large bearings that cannot be observed closely.