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Main points in selection of bearing type and type NSK


Standard form of NSK bearing size range, in the design of mechanical device is best when using standard bearings (this design to bearing whether easily purchase, here as an aside, some NSK bearing catalog model does, but some non-standard bearing no cash, in mainland China sometimes futures will for a long time, so in the bearing selection must consider the time cost and a late replacement cost) bearing load, load exerted on the bearing, the nature, size, direction is changeable. Typically, the basic load rating are displayed in the dimension table. Axial and radial loads and so on, is also an important factor for the selection of bearing. When the size of the ball and needle bearing, needle roller bearings typically have a higher load capacity and to bear the larger vibration and shock loads.
First, the limitation of size. NSK bearings can usually installation space is restricted. In most cases, the shaft diameter (or bearing diameter) is based on the mechanical design or other design constraints. Selection of bearing type and size is determined according to the inner diameter of the bearing. Thus, the standard bearing the main dimension tables are in accordance with international standards and the preparation of the diameter size.
Speed, promised to speed depending on the type, size of NSK bearings, precision, cage type, load, lubrication method, to determine the factors and cooling method. Bearing table lists the standard precision bearings under oil lubrication and oil lubrication of the promised speed. Usually, deep groove ball bearings, self-aligning ball bearings and cylindrical roller bearings are suitable for high speed operation of the occasion.
Bearing tolerance, bearing precision of size and rotation accuracy is based on the ISO and JIS standard. For the requirement of high precision and high-speed operation of the machinery, grade 5 or above is recommended precision bearings, deep groove ball bearings, thrust ball bearings or cylindrical roller bearings are suitable for high running accuracy of machinery. Rigid, when the roller and raceway contact surface pressure bearing, can generate elastic deformation. Some machines need to keep to a minimum the elastic deformation. Roller bearings are produced than ball bearing elastic deformation small.
Installation and disassembly, some applications require frequent disassembly and installation, to ensure that the periodic inspection and. The inner and outer rings of bearings can be installed separately as: cylindrical bearings, needle roller bearing, tapered roller bearing and is very suitable for this occasion. Self aligning ball bearings taper hole and a self-aligning roller bearing in the axle sleeve's help, but also simplify the installation program.
In addition, in some cases to exert preloading of NSK bearings to increase rigidity. This procedure is usually used for deep groove ball bearings, thrust ball bearings and tapered roller bearing inner ring and the outer ring of the bias, bent shaft, shaft or bearing box tolerance changes, combined with errors will cause the eccentricity of the inner and outer rings. In order to prevent the eccentric angle is too large, self-aligning ball bearings, self-aligning roller bearings, or self-aligning bearing seat is the better choice. Voice frequency and torque, the rolling bearing is according to the high standard of precision manufacturing, so the noise and small torque. Deep groove ball bearings and cylindrical roller bearing is suitable for low voice, low torque have special requirements of the occasion.

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