Internal and external factors affecting the service life of double row cylindrical roller bearings

First, the limitation of bearing size. Usually double row cylindrical roller bearings can be installed in limited space. In most cases, the shaft diameter (or bearing bore 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 dimension tables of standard bearings are compiled according to the international standard inner diameter size. Standard double row cylindrical roller bearings come in many sizes and forms, and it is best to use standard bearings in the design of mechanical devices (this is designed to determine whether the bearings are easy to purchase, here is a digression, some bearing catalogs do have models, but Some non-standard bearings are not available in mainland China, and sometimes the futures will take a long time, so the time cost and the cost of later replacement should be considered when selecting the bearing.) The load of double row cylindrical roller bearings, the load applied to the bearing , its nature, size, and direction are changeable. Usually, the rated base load is shown on the dimension table. However, axial load and radial load, etc., are also important factors in selecting suitable bearings. When ball and needle roller bearings are of the same size, double row cylindrical roller bearings usually have higher load capacity and withstand higher vibration and shock loads. Second, the bearing speed. The allowable speed is determined according to the type, size, accuracy, cage type, load, lubrication method, and cooling method of the double row cylindrical roller bearing. The bearing table lists the allowable speeds for standard precision bearings under oil and grease lubrication. Generally, deep groove ball bearings, self-aligning ball bearings and cylindrical roller bearings are suitable for high-speed operation. Third, bearing tolerances. The dimensional accuracy and rotational accuracy of double row cylindrical roller bearings are based on iso and jis standards. For machinery that requires high precision and high-speed operation, it is recommended to use bearings with a precision of grade 5 or above, while deep groove ball bearings, radial thrust ball bearings or cylindrical roller bearings are suitable for machinery with high running accuracy. Rigidity, when the rolling elements and raceway contact surfaces of the bearing are pressed, elastic deformation will occur. Some machines need to minimize elastic deformation. Roller bearings produce less elastic deformation than ball bearings.

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