How to choose bearings when customers want 20mm bearing?

1. According to the location, determine the size of the required bearing
Each bearing has its external dimensions that meet national standards (except for non-standard ones). In most cases, the shaft diameter (or bearing inner diameter) is based on mechanical design or other design constraints. Therefore, the choice of bearing type and size is determined according to the inner diameter of the bearing. Therefore, the main size tables of standard bearings are compiled according to the national standard inner diameter size. For 20mm bearings, it is necessary to confirm whether 20mm refers to the inner diameter or outer diameter or thickness, or the size of other positions.

2. Determine the required 20mm bearing speed according to the design requirements
The design speed value is determined according to the bearing type, size, accuracy, cage type, load, lubrication method, and cooling method. The allowable speed of standard precision bearings under oil lubrication and grease lubrication is listed on the national standard bearing table. Generally, deep groove ball bearings, self-aligning ball bearings and cylindrical roller bearings are suitable for high-speed operation. Then, for 20mm bearings, the type of 20mm bearing needs to be confirmed.

Three, according to the design requirements, determine the level of the required 20mm bearing
Bearing dimensional accuracy and rotation accuracy are designed in accordance with national standards. For machinery requiring high precision and high-speed operation, it is recommended to use bearings with accuracy of P5 or above. Deep groove ball bearings, radial thrust ball bearings or cylindrical roller bearings are suitable for machinery with high operating accuracy. Rigidity, when the contact surface of the rolling element and raceway of the bearing is compressed, it will produce elastic deformation. Some machines need to minimize elastic deformation. Roller bearings produce smaller elastic deformations than ball bearings.

4. In some cases, the 20mm bearing needs to be preloaded to increase rigidity. This program is usually used for deep groove ball bearings, radial thrust ball bearings and tapered roller bearings. The inner and outer ring offsets, shaft bending, shaft or bearing housing tolerance changes, and matching errors will cause the inner and outer ring eccentricity. In order to prevent the eccentric angle from being too large, self-aligning ball bearings, self-aligning roller bearings, or self-aligning bearing seats are better choices.

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