The accuracy grade of SKF bearings is increased from level 0 in order. Level 0 is sufficient for general use, but when used in the conditions or occasions shown in Table 1, accuracy of level 5 or higher is required.
Although the above accuracy levels are based on the ISO standard, their names are different in national standards.
Eric Bearing Limited lists the accuracy levels applicable to various SKF bearing types and the comparison between national standards.
Dimensional accuracy (items related to shaft and housing installation)
1. Allowable deviation of inner diameter, outer diameter, width and assembly width
2. The allowable deviation of the inner and outer diameters of the roller group
3. Allowable limit value of chamfer size
4. Allowable variation of width
Rotation accuracy (item related to beating of rotating body)
1. Radial and axial runout of the inner and outer rings
2. The inner ring is allowed to jump laterally
3. Allowable variation of the inclination of the outer diameter surface
4. The allowable variation of the thickness of the thrust bearing raceway
Standard SKF bearings come in a variety of sizes, and standard bearings are used in the design of mechanical devices (this design determines whether the bearings are easy to purchase. I will say aside here, some SKF bearing catalogs do have models, but some non-standard bearings are There is no spot in mainland China, and sometimes the futures will take a long time, so the time cost and the cost of later replacement must be considered when selecting the bearing) The load, the load, and the nature of the SKF bearing on the bearing are many changing. Usually, the rated basic load is shown on the dimension table. However, axial load and radial load are also important factors in choosing a suitable SKF bearing. When the size of the ball and needle roller bearings is equivalent, the needle roller SKF bearings usually have a higher load capacity and withstand larger vibration and shock loads. Bearings SKF 2216 EKTN9 online , click here to see more details :
The allowable speed is determined by factors such as SKF bearing type, size, accuracy, cage type, load, lubrication method, and cooling method. The SKF bearing table lists the allowable speed of standard precision bearings under oil lubrication and grease lubrication. Generally, deep groove ball bearings, self-aligning ball bearings and cylindrical roller bearings are suitable for high-speed operation.
SKF bearing dimensional accuracy and rotation accuracy are based on ISO and JIS standards. For machines that require high precision and high-speed operation, it is recommended to use SKF bearings with grade 5 or higher accuracy. Deep groove ball bearings, radial thrust ball bearings or cylindrical roller bearings are suitable for machines with high running accuracy. Rigidity, when the rolling elements and raceway contact surfaces of SKF bearings are compressed, elastic deformation will occur. Some machines need to minimize elastic deformation. Roller bearings produce less elastic deformation than ball bearings.
In addition, in some cases, SKF bearings need to apply preload to increase rigidity. This procedure is usually used for deep groove ball bearings, radial thrust ball bearings and tapered roller bearings, inner and outer ring offset, shaft bending, shaft or bearing box tolerance changes, fit errors will cause eccentricity of the inner and outer rings. In order to prevent the eccentric angle from being too large, self-aligning ball bearings, self-aligning roller bearings, or self-aligning bearing seats are the better choices. Voice frequency and 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 with special requirements for low noise and low torque.