The accuracy grade of SKF bearings is increased from 0 to 10, and is sufficient for general purpose 0. However, when used in the conditions or occasions shown in Table 1, accuracy of 5 or higher is required.
Although the above accuracy levels are based on the ISO standard, their names are different in national standards.
The accuracy levels applicable to the various SKF bearing types and the comparison between national standards are listed.
Dimensional accuracy (items related to shaft and housing installation)
1. Allowable deviation of inner diameter, outer diameter, width and assembly width
2. Allowable deviation of the diameter of the compound circle and the diameter of the outer complex circle in the roller group
3, the allowable limit value of the chamfer size
4, the allowable variation of the width
Rotation accuracy (items related to the rotation of the rotating body)
1. Allowable radial runout and axial runout of the inner and outer rings
2, the inner ring allows lateral runout
3. Allowable variation of the inclination of the outer diameter surface
4. Allowable variation of the thickness of the thrust bearing raceway
Standard SKF bearings are available in a variety of sizes. It is best to use standard bearings when designing mechanical devices. (This design is easy to purchase from bearings. Here is a question. Some SKF bearing catalogues do have models, but some non-standards. Bearings are not in stock in mainland China, and sometimes there will be long-term futures, so the cost of time and the cost of later replacement should be taken into account when selecting bearings. The load of SKF bearings, the load applied to the bearings, its nature, size and direction. It is changeable. Usually, the rated base load is shown on the dimension table. However, axial load and radial load are also important factors in selecting suitable SKF bearings. When the size of the ball and needle bearing is equivalent, the needle roller SKF bearing usually has a high load capacity and withstands large vibration and shock loads.
The allowable speed is determined by factors such as the type, size, accuracy, cage type, load, lubrication method, and cooling method of the SKF bearing. The allowable speed of standard-precision bearings under oil lubrication and grease lubrication is listed on the SKF bearing table. 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 requiring high precision and high speed operation, it is recommended to use SKF bearings with 5 or more precision. Deep groove ball bearings, radial thrust ball bearings or cylindrical roller bearings are suitable for machines with high running accuracy. Rigidity, when the rolling element and the raceway contact surface of the SKF bearing are pressed, an elastic deformation occurs. Some machines need to minimize elastic deformation. Roller bearings have less elastic deformation than ball bearings.
In addition, in some cases SKF bearings are subject to preload to increase rigidity. This program is usually used for deep groove ball bearings, radial thrust ball bearings and tapered roller bearings. The shaft is bent, the shaft or bearing housing tolerance changes, and the misalignment will lead to the eccentricity of the inner and outer rings. In order to prevent the eccentric angle from being too large, automatic self-aligning ball bearings, self-aligning roller bearings, or self-aligning bearing seats are preferred choices.å—“ Audio frequency and torque, rolling bearings are manufactured according to high-precision standards, so the sound and torque are small. Deep groove ball bearings and cylindrical roller bearings are suitable for applications where low noise and low torque are required.
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Label: How to choose SKF bearing type accuracy grade
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