Avoid bearing jammed, understand the three typical bearing configuration form

A shaft will often need two fulcrum, which is to support two sets of rolling bearing. And bearing configuration just solved the fulcrum bearing on how to axial shaft is fixed, and after the heat expansion bearings how to avoid the problem of stuck. Below the bearing network according to the understanding of the knowledge of bearing, bearing configuration to share knowledge of related typical hope to be of help. Before we configure, must understand the bearing related some key points: 1, the temperature change caused by the expansion of the shaft, contraction. 2, bearings to install and remove easily. 3, due to the deflection of shaft, the inner ring and outer ring caused by installation error of tilt. 4, including bearings, the rotation system of study and preloaded method. 5, on the most appropriate location and under load. Avoid bearing jammed, understand the three typical bearing configuration forms: 1, double protection the unidirectional fixed form of this configuration is to let each fulcrum of shafting axial fixed in one direction. Its defect is: as the two fulcrum were bearing cover is fixed, so when the axial thermal elongation, resulting in bearing by the effect of additional load, affect the service life. So in this form is only suitable for the working temperature is not high and the shaft is shorter ( Span L 400 mm or less) The occasion. For deep groove ball bearings should also in the bearing outer ring and bearing cover set aside axial clearance between C, C = 0. 2 to 0. 4 mm to compensate for the heat of the axial elongation, because the clearance is small, don't draw on the drawing. For angular contact bearings, thermal compensation gap on the inside of the bearing clearance. 2, a fulcrum bidirectional fixed and the other fulcrum swimming as shown in the figure below, the left side of fixed protection, inherit the two-way axial force; Right end for swimming to stand, and only bear radial force, axial thermal elongation when can make the axial winding. When the axial force to the fixed protection can use deep groove ball bearings, around its outer sides were fixed. Figure in the upper part on the bearing hole convex shoulder is fixed, the structure of the hole is not completed a boring, affects the machining efficiency and coaxial degree. Axial force is small hole with elastic ring fixed outer ring are available, and as shown in figure in the lower part. To bear axial force to the right, and inner ring fixed protection must also axial fixation. Swimming for protection, often use deep groove ball bearings, also can be used when radial force big cylindrical roller bearing, as shown in figure in the lower part. When choosing deep groove ball bearings, bearing outer ring and leave big space between the bearing cover, the axial thermal expansion can free elongation, but its coil axial fixation, in case the bearing looseness. When moving pivot using cylindrical roller bearing, for them, outer ring axial relative motion, axial fixed, so the inner and outer ring should be to avoid moving outer ring, cause excessive dislocation. Design should pay attention to the bearing inner and outer circle don't appear the excess or inadequate axial fixation. Below two angular contact bearings fixed protection used in symmetric arrangement, respectively, under the direction of the left and right two axial force, Shared radial force, is suitable for the occasion of axial load is bigger. Fixed protection adopted, for example, as for ease of assembly adjusting cup structure at this point, choosing the size of the moving pivot bearing, the general should make bearing outside diameter and the cup diameter equal to facilitate the processing of two bearing hole. 3, travelling support on both ends when both fulcrum bearing designed to walk, the location of the shafting components required by other measures. For example: for supporting the herringbone gear shaft components, its location can be determined by the herringbone gear geometry, then swim two protection must be designed to support, but for meshing with herringbone gear ( Figure above) Of shafting components must be fixed on both ends, so that both shaft axial positioning.