The first is the limitation of size. Usually the space that NSK bearings can be installed is limited. In most cases, the shaft diameter (or NSK bearing bore diameter) is limited by mechanical design or other design. Therefore, the choice of NSK bearing type and size is determined according to the inner diameter of NSK bearing. Therefore, the main dimension charts of standard NSK bearings are prepared according to the international standard bore diameter dimensions.
Standard NSK bearings have a wide range of sizes, and it is best to use standard NSK bearings when designing mechanical devices (this design to NSK bearings is easy to purchase, here to say a digression, some NSK bearing catalogs on the model do have, but some non-standard NSK bearings are not in stock in the Chinese mainland, and sometimes the futures will be long, so consider the time cost and the cost of later replacement when selecting NSK bearings) NSK bearing load, the load applied to NSK bearings, its nature, Size and direction are variable. Typically, the rated base load is shown on the size chart. However, axial load and radial load are also important factors in choosing suitable NSK bearings. When ball and needle roller bearings are of comparable size, needle roller NSK bearings usually have a higher load capacity and withstand large vibration and shock loads.
Secondly, the rotational speed. The permissible speed is determined according to the type, size, accuracy, cage type, load, lubrication method, and cooling mode of NSK bearings. The NSK bearing table lists the permissible speed of standard precision NSK bearings under oil and grease lubrication. In general, deep groove ball bearings, self-aligning ball bearings and cylindrical roller bearings are suitable for high-speed operation. Again, NSK bearing tolerances.
NSK bearing dimensional accuracy and rotational accuracy are based on ISO and JIS standards. For machinery requiring high precision and high speed, NSK bearings with accuracy of class 5 or above are recommended, 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 NSK bearings are compressed, elastic deformation will occur. Some machines require minimal elastic deformation. Roller bearings produce less elastic deformation than ball bearings.
In addition, in some cases, NSK bearings are preloaded to increase rigidity. This procedure is typically used for deep groove ball bearings, radial thrust ball bearings and tapered roller bearings with offset inner and outer rings, shaft bending, shaft or NSK housing tolerances, and misfit errors that can lead to eccentricity of the inner and outer rings. To prevent excessive eccentricity, self-aligning ball bearings, self-aligning roller bearings, or self-aligning housings are the best choices. Voice rate, torque, rolling bearings are manufactured according to high-precision standards, so the voice and torque are small. Deep groove ball bearings and cylindrical roller bearings are suitable for occasions where low voice and torque are particularly required.
Installation and removal, some applications require frequent disassembly and installation to ensure regular inspection and maintenance. NSK bearings that can be mounted separately on the inner and outer rings such as cylindrical bearings, needle roller bearings, and tapered bearings are very suitable for this occasion. Self-aligning ball bearings and self-aligning roller bearings in tapered bore type also simplify the installation procedure with the help of bushings.
