Rolling bearing support system composite structural design
Supporting side structure
In order to ensure the normal pass of the rolling bearing shaft axial force and does not occur ran axis part positioning fixed on the basis of the rational design of the fixed axial structure of the shaft fulcrum. There are three types of typical structure.
1. Both ends of a one-way fixed
The short axis of the normal operating temperature (span L <400mm), the fulcrum is often used at both ends of a one-way fixed way, each bearing, respectively, under the direction of the axial force. Figure 17-15. To allow the shaft work a small amount of thermal expansion, bearing installation should be left 0.25mm-0.4mm axial gap (the gap is very small, do not have to draw on the chart), commonly used gasket or adjustment screw to adjust the gap amount.
2. End of the two-way fixed end of the swimming
When the shaft is longer or higher operating temperature, the axis thermal expansion contraction, should adopt the one end of the two-way fixed, one end of the fulcrum of the swimming structure, as shown in Figure 17-16. Fixed terminus of a single bearing or bearings to withstand the bidirectional axial force, swimming side to ensure that the axis stretching can swim freely. To avoid loose, swimming in the bearing inner ring and shaft axially fixed (often elastic ring). For swimming fulcrum with cylindrical roller bearings, the bearing outer ring and the base unit for axial fixation by swimming between the roller and the ring to ensure that the axis of free expansion.
3 at both ends of swimming
Requirements can be bi-directional swimming around the axis, can be used at both ends of the shaft structure of the swimming. Figure 17-17 shows. Herringbone gear drive high-speed axis, in order to automatically compensate for the tooth on both sides of the helix angle error, so that the tooth even by force, using the structure allow the shaft about a small amount of axial swimming, so both ends of selected cylindrical roller bearings . Rather than engage the low speed gear shaft must be fixed at both ends, so that the two axes are the axial position.
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