Selection of SKF bearing accuracy grade

Source: China Bearing Network Time: 2014-01-11

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The selection of SKF bearing accuracy grades is based on different requirements; each bearing manufacturer has products that supply different precision requirements; the following will be some accuracy analysis of bearings. The accuracy of rolling bearings is mainly divided into: scale accuracy and rotation accuracy.
The bearing accuracy grade is standardized; it is divided into six grades, 6X grade, 6 grade, 5 grade, 4 grade, and 2 grades.
Bearing accuracy progresses from level 0; it is usually satisfied with level 0; but when used for other conditions or occasions;
Requires accuracy of level 5 or higher.
The above accuracy grades are based on the ISO specification; however, their titles differ in the dimensional accuracy of bearings in various national specifications (projects related to shaft and housing devices).
1. The tolerance of inner diameter, outer diameter, width and installation width 2. the error of the diameter of the complex circle in the roller group and the diameter of the outer complex circle. 3. The allowable limit value of the chamfering scale. 4. The width of the variable. Accuracy (items related to the rotation of the rotating body)
1. The inner ring and the outer ring allow the radial runout and the axial runout 2. The inner ring allows the lateral runout 3. The allowable variation of the outer diameter face skewness 4. The allowable variation of the thrust bearing raceway thickness 5. The tapered hole The tolerance of the agreement and the amount of change in response to the FAG bearing (common duty class PN) with the usual scale accuracy and rotation accuracy are satisfied in most cases. When the demand is higher; the bearing requires a higher accuracy level; for example, the machine tool spindle Bearings. In order to reach higher precision requirements; the rules and regulations of the P6, P6X, P5, P4 and P2 public service grades. FAG also according to the company's specifications for some special bearings rules P4S, SP and UP public service.
The neutrality is presented when the machining journal is cooperating with the outer surface or the bearing housing. In particular, the processing of the cooperating surface is not completed in one loading. The bearing housing may also be misaligned; for example, flanged housing or vertical FAG imported bearing housing. Because the working load causes the shaft to bend and deform; when it causes the inner and outer rings of the bearing to be skewed; it will also be misaligned.
Self-aligning SKF bearings can compensate for misalignment and skewness; for example, self-aligning ball bearings, pen-shaped roller bearings, centripetal and thrust spherical roller bearings. These bearings have a concave spherical outer ring raceway; The body and inner ring can rotate inside. The ability of these bearings to compensate the deflection angle of the shaft centerline depends on their type, size and load.
The outer spherical bearing and the SKF thrust ball bearing with race have a spherical bearing surface, which can be adjusted to compensate the deflection angle when the device is in the concave spherical race.

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