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Effect of relative axial displacement between the shaft and bearing box

wallpapers Tech 2020-05-27
Generally, the shaft is supported by two bearings in the radial and axial directions. The bearing on one side is called a fixed-end bearing. It bears both radial and axial loads. The role of axial displacement. The other side is called the free end, which only bears the radial load, and the axial direction can move relatively.
 
 The fixed-end bearings must be fixed with the shaft and the bearing box at the same time. The more suitable bearings are radial bearings that can withstand compound loads, such as deep groove ball bearings, spherical roller bearings, and double-row or matched angular contact ball bearings or tapered roller Sub-bearing. Radial bearing combinations that bear simple radial loads, such as cylindrical roller bearings without ribs on the inner and outer rings combined with deep groove ball bearings or four-point contact ball bearings or bidirectional thrust bearings, can also be used as fixed-end bearings. At this time, the second SKF bearing provides bidirectional axial positioning, but it must be kept at a certain radial distance from the bearing box during installation. The free end bearing will not squeeze in the bearing when the length of the shaft changes due to thermal expansion. Axial displacement can occur inside the bearing, as well as bearing rings and bearing seats.
 
  "Cross-fixed" refers to a bearing configuration in which each bearing is positioned unidirectionally with the shaft in opposite directions. This combination is mainly used for the short axis. All radial bearings that can withstand axial loads in at least one direction are suitable, including deep-groove and angular contact ball bearings, tapered roller bearings, and NJ cylindrical roller bearings. When angular contact ball bearings or tapered roller bearings are used, In some cases, a preload must be applied.
 
Bearing speed: The running speed of rolling bearings is limited by the allowable operating temperature. Low-friction bearings have correspondingly lower heat generated inside, so they are most suitable for high-speed operation. Deep groove ball bearings and self-aligning ball bearings under pure radial load, or angular contact ball bearings under combined load, can withstand higher speeds than other bearings. And precision angular contact ball bearings or deep groove ball bearings with ceramic rolling elements can achieve even higher speeds. For design reasons, the running speed of thrust bearings cannot be as high as radial bearings.
 
 They are bearing accuracy: Bearing configurations that require high rotation accuracy (such as machine tool spindles) and applications at high speeds, bearings with higher accuracy than ordinary grades should be selected. It can provide a variety of high-precision bearings, including single-row angular contact ball bearings, single-row, and double-row cylindrical roller bearings, as well as one-way and two-way angular contact thrust ball bearings.

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Tag: bearing box