Ningbo Feiyu Bearing Co.,Ltd

The most commonly used bearings in motors-deep groove ball bearings

　　 One of the most commonly used bearings in motors is deep groove ball bearings. In the field of industrial motors, the use of deep groove ball bearings accounts for more than 70% of the total use of bearings. In terms of quantity used, the proportion will be greater. Therefore, if the motor engineer can be very familiar with the deep groove ball bearing, he can understand the application of the motor bearing to a large extent.

　　Deep groove ball bearings, the previous domestic standards are called radial ball bearings. As the name implies, this type of bearing is subjected to centripetal loads and the rolling elements are spherical. The centripetal load mentioned here is the so-called radial load. Therefore, the main bearing capacity of deep groove ball bearings is in the radial direction.

　　At the same time, due to the structural characteristics of its channel, the bearing can withstand a certain axial load. The axial load capacity of deep groove ball bearings is much weaker than the radial load capacity. Therefore, under the condition of axial load, the life of the deep groove ball bearing needs to be checked to ensure that the bearing can achieve the expected effect of operation under this load.

　　Deep groove ball bearings, compared with roller bearings, the contact between the internal rolling elements and the raceway is point contact. Below we briefly analyze the characteristics and limitations of deep groove ball bearings.

Characteristics of deep groove ball bearings

　　01. The ability to bear radial load is weaker than roller bearings

The bearing capacity of deep groove ball bearings is smaller than the corresponding roller bearings, but it is sufficient for general industrial motors. Often for external radial loads such as external pulleys, the load capacity may not meet the requirements. In this case, cylindrical roller bearings can be used.

　　02. The internal friction of the bearing is relatively small, and the heat is small

The rolling element and the raceway are in point contact, and the internal heating of the bearing is relatively small. If it is a bearing with a seal, the friction heat of the seal needs to be considered during operation.

　　03. High speed of bearing

The internal rolling element of the deep groove ball bearing is a ball. Compared with the roller bearing, the rolling element has a relatively small mass and low centrifugal force during high-speed rotation. The commonly used stamped rigid cages and nylon cages have better strength, so The mechanical limit speed capability of deep groove ball bearings is relatively high. Correspondingly, since the heat generation is relatively small, the thermal reference speed capability of the deep groove ball bearing is relatively high.

　　04. Simple bearing arrangement

Deep groove ball bearings can withstand both axial and radial loads, so this type of bearing can be used as either a positioning bearing or a non-locating bearing.

　　05. Simple to use, convenient to store and transport

Deep groove ball bearings are usually an integrated bearing structure, so the installation, storage and transportation of bearings are simpler than split bearings.

　　06. Simple maintenance

Usually deep groove ball bearings are open, with dust cover and with seals, which greatly simplifies the workload of relubrication of the bearing and has the characteristics of simple operation.

Limitations of deep groove ball bearings

Deep groove ball bearings have their own limitations due to their structural characteristics:

1. Anti-eccentricity

　　 General deep groove ball bearings have very limited eccentric adjustment capabilities, generally within the range of less than 10 arc minutes. This eccentricity is brought by its own structure and play, and is not reserved for application conditions. Therefore, it is not recommended that electrical engineers use this eccentricity.

2. Damage during bearing installation

　　Deep groove ball bearings are in point contact, so they are easily injured during installation. Therefore, when installing the motor bearing, it is necessary to avoid the rolling force caused by the mounting force.

3. Temperature limit

　　Generally, the heat treatment dimension stability temperature of the deep groove ball bearing itself is 120 degrees Celsius. Therefore, deep groove ball bearings are not suitable for operation above this temperature.

At the same time, the temperature limits of lubricants, cages and seals need to be considered when selecting deep groove ball bearings under high temperature conditions. (Please refer to related articles in the official account)

4. Application under vibration conditions

　　Deep groove ball bearings are likely to cause damage to raceways and rolling elements under vibration conditions. Therefore, under vibration conditions, deep groove bearings will encounter certain challenges.

　　 All in all, deep groove ball bearings are good bearings for motors. Of course, there will be slight differences between various brands, this article only shares the commonality of such bearings.