The selection procedure of NACHI bearing It is not an easy task to choose the most suitable bearing type and assembly method. It is not an exaggeration to say that the selection of NACHI bearing model is correct or not, which is directly related to the ability to achieve the expected design performance and life of the bearing. There are no general rules for the selection procedure of bearings. The designer must give priority to and decide the model according to the most needed indicators among the various characteristics of the bearing. Figure 1.1 is an example of a bearing selection procedure that can be used as a reference for design. ● Fig. 1.1 Bearing selection procedure calculates the necessary dynamic load rating based on the required life of the load revolutions. Discuss whether the accuracy of the shaft and seat sleeve is the same or similar to that of the bearing. In order to prevent damage to the bearing and the intrusion of foreign objects, examine the working environment, and design fixtures and tools for installation. Prevents the intrusion of external debris, moisture, etc. No maintenance is required, but the refill grease cannot be replaced. It is necessary to design on the condition that the grease can be exchanged and replenished. It is necessary to take measures to prevent foreign matter from entering the oil/grease leakage from the outside. The performance of the bearing is required. The study of bearing arrangement and bearing model determines the selection of the dynamic load rating accuracy grade and the selection of the appropriate bearing size. No Yes selection of the lubrication system. Determine whether the rated static load is less than the rated static load within the decision limit value of the research and configuration. Check whether it is economical (whether standard products can be used) u0026#1056131; The direction and size of the load Rotation speed u0026#1056133; Noise torque u0026#1056134; Inner and outer rings Inclination u0026#1056135; Rigidity u0026#1056136; Shaft direction position determination and pairing u0026#1056137; Mounting and dismounting u0026#1056138; Resulting vibrationu0026#1056133; Rotation speedu0026#1056131; Distinguishing rotating ringu0026#1056132; Distinguishing static rotating shock loadu0026#1056133; Shaft, seat cover materialu0026#1056134; Distinguishing fixed side and rotating sideu0026#1056135; High speed The inner ring expands due to centrifugal force during rotation. Study of Bearing Models Page 3 2. Bearing Life Page 4 3. Bearing Accuracy Page 7 5. Preload and Rigidity Page 14 6. Lubrication Page 22-2. Recommended Accuracy of Shaft and Housing Page 28 Page 9. Use of Bearings Page 30 7. Limiting Speed u200bu200bPage 26 2-4. Basic Static Load Ratings and Equivalent Static Loads Page 6 Page 27 8-1. Closed bearing Open bearing If the bearing life is longer than the mechanical life, the lubrication and sealing should be designed with the policy of not requiring maintenance. When the life of the bearing and the life of the grease are shorter than the life of the machine, the design is based on the principle that the bearing can be easily replaced with the grease replenishment and replacement, and the maintenance interval is determined. As needed, install monitors to monitor vibration temperatures and predict bearing life. u0026#1056131; Replace the ball bearing with a roller bearing and use a combination bearingu0026#1056133; Reduce the size and replace it in the middle of the design space. Grease and lubricating oil lubrication When high-speed rotation is required, if low vibration and low noise are required, the bearing part needs to be Higher rigidity, in this case preload is required.