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What are the challenges in selecting support layout methods?
Source: China Bearing Network Time: 2018-07-04
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1. How to constrain the orientation of the shaft; including radial and axial orientation is the first problem to be considered. The usual axles are mostly double-supported; the radial orientation of the shaft is constrained by two supports; each support should be Radial positioning effect of the centripetal or angular touch bearing. The axial azimuth can be axially displaced by one of the two bearings in one direction; it can also be controlled by a different support. Therefore, the bearing layout should be based on the axis. Xuan precision and working conditions; select a detailed plan for axial positioning.
2, when receiving the radial load and axial load together; the support often uses angular touch bearing and tapered roller bearing paired device. The two bearing outer ring wide end face relative device is called back to back device. The two supporting force effect points In addition to the support span, this placement method is large due to the support span; the rigidity of the shaft cantilever is good; the inner and outer rings are disengaged when the shaft is heated and extended; therefore, the shaft is not stuck; therefore, the application is relatively extensive. However, if the pre-tensioning device is used, the pre-tightening amount will be reduced when the shaft is heated. The narrow end faces of the two bearing outer rings are called face-to-face devices. The force effect points of the two bearings fall within the supporting span. The layout of the method is simple, easy to assemble, disassemble and debug, so it is more widely used; it is mainly used for short shafts and low temperature rise; but it must be noted that there must be spare clearance. The axial clearance should not be too large. When it is too large, it will lower the working precision of the shaft. When the axial load is large; when multiple bearings are required to be accepted together, the series method of the bearing outer ring width and narrow end face relative device is often used. The bearing force effect points all fall on the bearing. The same side, so called the same direction When you choose this method to place focus on the layout of the bearings can ensure that each receives a load as evenly as possible.
3. The machine is in operation; usually the temperature of the main shaft or the drive shaft is higher than the temperature of the adjacent parts; therefore, the shaft will expand and expand. In order to maintain the axis change sensitivity; in the support layout depiction; in the satisfactory axial positioning accuracy requirements Together; also think about the need for heat and elasticity. The method of axial positioning and axial elasticity corresponds.
4. Adjusting the bearing clearance is to control the working precision of the shaft. The axial azimuth speed adjustment of the shaft is to satisfy the special requirements of some meshing transmissions.
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