SKF bearings: the effect of clearance on the number of lives

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SKF bearings: the effect of clearance on the number of lives

Source: China Bearing Network Time: 2013-01-03

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1. The interference cooperation between SKF bearings and shafts and casings leads to a reduction in clearance.
2. When the bearing is working; the temperature difference between the inner and outer rings causes the clearance to decrease.
3. The production data of the shaft and the casing are reduced or increased due to the different expansion coefficients.
The application experience indicates that the most suitable working clearance for ball bearings is approximately zero, and the most suitable working conditions for roller bearings should adhere to a small amount of working clearance. In the case of demanding rigid parts (such as machine tool spindles); Preload with a certain value.
The spherical roller bearing consists of a double race inner ring, two rows of spherical rollers, a holding frame and a large spherical outer ring. The spherical roller bearing can be actively aligned; it can accept two-way axial load; Can accept large radial loads.
Reflow button valve: as long as it is in the high quality oil filter. When the engine is off; it can prevent the oil filter from drying out, when the engine is incinerated from the head; it immediately pressure; the supply of oil smooth engine.
Determination of SKF bearing clearance:
1. When measuring the clearance of the bearing unit, determine the clearance of the bearing unit; place the bearing on the platform; press the bearing outer ring by hand; pay attention to the inner ring; the outer ring is not skewed; Circle; make the roller stable. Then; the left and right columns of a roller are placed in the upper position. Use the feeler to measure the internal clearance; its measurement orientation and measurement point are somewhat different according to the outer diameter of the bearing. The bearing clearance measurement of more than 200 mm is to insert the feeler gauge into the orientation between the two rows of rollers and the outer circle directly above the bearing and between the two rows of rollers in the left-right symmetrical orientation of the bearing; Clearance. The internal clearance (R) of the bearing is the internal clearance of the bearing measured between the two rows of rollers and the outer ring directly above the bearing (r1)` (r2), the internal clearance above the bearing Set to (RT).
2. The clearance of the SKF bearing mounted on the shaft or the adapter sleeve determines the clearance of the outer ring of the bearing when the roller is in a sagging condition. Firstly, ensure that the bearing's straight posture changes to the outer ring 1/2-1 circle; 2 columns The roller column is a roller that is directly below the orientation. The feel is measured with a feeler gauge; the measured portion is somewhat different according to the outer diameter of the outer ring of the bearing. The bearing clearance of the outer ring with an outer diameter of more than 200 mm is measured by the feeler. Between the two rows of rollers on the upper side of the bearing and between the outer ring and between the two rows of rollers in the left-right symmetrical orientation of the bearing and the inner ring; the internal clearance of each bearing is measured.
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