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Influence of bearing configuration on accuracy

wallpapers Tech 2020-07-29
Generally, the shaft is supported by two bearings in the radial and axial directions. The bearings on one side is called the fixed end bearing. It bears both radial and axial loads, which is the relative position between the fixed shaft and the bearing box. The role of axial displacement. The other side is called the free end, which only bears radial load and can move relative to the axial direction. The fixed end bearing must be fixed with the shaft and the bearing housing at the same time. The more suitable bearing is a radial bearing that can withstand compound loads, such as deep groove ball bearings, spherical roller bearings, and double row or paired angular contact ball bearings or tapered rollers. Sub-bearing. Radial bearing combinations that bear pure radial load, such as cylindrical roller bearings without ribs on the inner and outer rings, can be combined with deep groove ball bearings, four-point contact ball bearings or two-way thrust bearings, and can also be used as fixed-end bearings. At this time, the second bearing provides bidirectional axial positioning, but it must be installed with a certain radial distance from the bearing housing. When the length of the free-end bearing changes due to thermal expansion of the shaft, no squeezing occurs in the bearing. Axial displacement can occur inside the bearing, as well as the bearing ring and the bearing seat. "Cross-fixed" refers to a bearing arrangement in which each bearing positions the shaft in one direction and in the opposite direction. This combination is mainly used for short shafts. All radial bearings that can withstand axial load in at least one direction are applicable, 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, the In some cases, preload must be applied. Bearing speed: The running speed of rolling bearings is limited by the allowable operating temperature. Low-friction bearings have relatively low internal heat generation, so they are most suitable for high-speed working conditions. 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 even reach higher speeds. Due to design reasons, the running speed of thrust bearings cannot be as high as radial bearings. Bearing accuracy: For bearing configurations requiring high rotation accuracy (such as machine tool spindles) and for high-speed working conditions, bearings with higher accuracy than ordinary bearings should be selected. 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: bearings