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The accuracy grade of is improved successively from grade 0. Grade 0 is sufficient for general purposes, but grade 5 or higher accuracy is required for the conditions or occasions. Although the above accuracy levels are based on ISO standards, their names are different in national standards. The Accuracy grades applicable to various SKF Bearing Types and the comparison between national standards are listed.
1. Allowable deviation of inner diameter, outer diameter, width and assembly width
2. Allowable deviation of inner and outer diameter of roller set
3. Allowable limit value of chamfer size
4. Allowable variation of width
1. Allowable radial runout and axial runout of inner ring and outer ring
2. Allowable lateral runout of inner ring
3. Allowable variation of inclination of outer diameter surface
4. Allowable variation of thrust bearing raceway thickness
Standard SKF bearings have various sizes and forms, and standard bearings are used in mechanical device design This is designed to make bearings easy to purchase. Here’s a digression. Some SKF bearing catalog models do have some, but some non-standard bearings are not available in Chinese mainland, and sometimes futures will be very long time. So when bearing selection, we should consider the cost of time and the cost of later replacement. The load of SKF Bearing and the load applied on the bearing are variable in nature, size and direction. Generally, the rated basic load is shown in the size table. However, axial load and radial load are also important factors for selecting suitable SKF Bearing. When the sizes of ball and needle roller bearings are the same, needle roller SKF Bearing usually has high load capacity and bears large vibration and vibration Impact load.
The allowable speed is determined according to the type, size, accuracy, cage type, load, lubrication mode, cooling mode and other factors of SKF Bearing. The SKF Bearing table lists the allowable speed of standard precision bearing under oil lubrication and grease lubrication. Generally, deep groove ball bearing, automatic self-aligning ball bearing and cylindrical roller bearing are suitable for high-speed operation. The dimensional accuracy and rotation accuracy of SKF bearings are based on ISO and JIS standards. For machines requiring high accuracy and high-speed operation, it is recommended to use SKF bearings with accuracy of grade 5 or above. Deep groove ball bearings, centripetal thrust ball bearings or cylindrical roller bearings are suitable for machines with high operation accuracy. Rigidity. Elastic deformation will occur when the contact surface of rolling elements and raceways of SKF bearings is pressed. Some machines The machine needs to reduce the elastic deformation to a minimum. Roller bearings produce less elastic deformation than ball bearings.
In addition, in some cases, SKF bearings need to be preloaded to increase rigidity. This procedure is usually used for deep groove ball bearings, centripetal thrust ball bearings and tapered roller bearings. Inner and outer ring offset, shaft bending, shaft or bearing housing tolerance change, and matching error will lead to inner and outer ring eccentricity. In order to prevent excessive eccentricity angle, self-aligning ball bearings, self-aligning roller bearings, or self-aligning shafts The bearing seat is a better choice. The voice frequency and torque of 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 voice and low torque.