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Preloading of rolling bearings

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In order to improve the rotation precision of the bearing, the rigidity of the bearing equipment is added; the oscillation of the shaft during the machine operation is reduced; the pre-tightening dynamic bearing is often used. For example, the spindle bearing of the machine tool is often pre-tensioned to improve its rotation precision and axial stiffness.
The so-called pre-tightening; that is, in the equipment, some kind of method occurs in the bearing and adheres to an axial force; to eliminate the axial clearance in the bearing; and the initial deformation occurs in the rolling body and the inner and outer ring touches. When the rear bearing is subjected to the working load; the radial and axial relative movement of the inner ring is greatly reduced compared to the untensioned bearing. The commonly used pretensioning devices are: 1) clamping a pair of tapered roller bearings Pre-tightening of the outer ring (figure a), 2) pre-tightening with a spring; able to obtain a stable pre-tightening force (figure b), 3) preloading the sleeves of different lengths at the center of a pair of bearings The pre-tightening force can be controlled by the length difference between the two sets of quotients (Fig. C below); this kind of equipment is relatively rigid, 4) clamping a pair of narrowed outer rings and pre-tightening (figure d) Grinding the inner ring and clamping. This special pair of equipment angular touch ball bearings; can be selected and supplied by the manufacturer. In the rolling bearing sample, it can be found that different types of paired equipment angular touch ball bearings are light. Medium, heavy and three series preloading values ​​and the corresponding inner or outer ring.
Preloaded layout of the bearing

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