Bearing selection

Bearing knowledge lectures: Selection of bearings Market requirements for various mechanical devices and instruments that use rolling bearings have become increasingly stringent, and the conditions and performance required for bearings have become increasingly diversified. In order to select the most suitable bearing from a large number of structures and sizes, it is necessary to study from various angles. When selecting a bearing, the bearing structure is generally determined by taking into account bearing arrangement, mounting and dismounting of the shaft system, the space, size, and marketability of the bearing. Next, the bearing size is determined while comparing the design life of various machines using bearings and various different durability limits of the bearings. When selecting a bearing, it is often preferred to consider only the fatigue life of the bearing, and the grease life, wear, and noise that occur due to aging of the grease must also be fully studied. In addition, depending on the application, it is necessary to select the bearing for which the design is required, such as accuracy, clearance, cage structure, grease, and the like. However, there is no definite order and rule for selecting bearings, and it is particularly practical to give priority to the conditions, performance, and the most relevant matters required for bearings. Bearing Requirements Conditions, Performance Conditions of Use, Environmental Conditions Bearing Mounting Dimensions The size of the space load allowed by the bearing, the direction of vibration, the impact rotation speed, the limit rotation speed of the bearing, and the inclination of the inner ring and the outer ring in the axial direction Difficult noise with bearing arrangement and loading and unloading Rigidity Marketability, economical decision bearing structure, arrangement using mechanical and design life Equivalent dynamic load or equivalent static load Rotational speed Permissible axial load (in the case of cylindrical roller bearings) Dimensional Rotational Swing Accuracy High Speed ​​Rotation Torque Variation Determines Bearing Accuracy Level Match Inner Ring and Outer Ring Temperature Difference Rotation Speed ​​Inner and Outer Ring Preload Determines (Internal) Clearance Rotation Noise Noise Temperature Determines the Shape of the Cage , Material temperature Rotation speed Lubrication method Sealing method Maintenance and repair decision Lubrication method, lubricant, sealing method Loading and unloading order Dimensions related to installation Dimensions related to installation Depending on loading and unloading methods Final specifications of parts around bearings and bearings

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