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Bearing support selection needs to be considered
Source: China Bearing Network Time: 2018-07-01
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How to constrain the orientation of the shaft; including radial and axial orientation is the first problem to be considered. The usual shafts are mostly double-supported; the radial orientation of the shaft is constrained by two supports; each bearing should have radial The centripetal or angular touch bearing of the positioning effect. The axial azimuth can be axially displaced by one of the two bearings in one direction and can be axially displaced by two directions in one direction; in the usual case; different axial positioning methods Different working precision can be obtained. Therefore; the layout of the support should be based on the accuracy and working conditions of the shaft; select the detailed plan for axial positioning.
When the radial load and the axial load are accepted together; the angular contact bearing and the tapered roller bearing pairing device are often used for the support. The angular touch bearing has three kinds of positioning methods for the paired device. The two bearing outer ring wide end face opposing device The back-to-back device method is called. The two supporting force effect points fall outside the support span. This placement method is large due to the support span; the steel is good when the shaft is cantilevered; the inner and outer rings are disengaged when the shaft is heated and extended; Therefore, the shaft will not be stuck; therefore, the application is more 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 the face-to-face device method. The two supporting forces The effect point falls within the support span. This layout 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 paid attention to There is spare clearance. The axial clearance should not be too large; the working accuracy of the falling shaft is too large. When the axial load is large; when multiple bearings are required to be accepted together, the series connection of the bearing outer ring width and narrow surface relative device is often used. Method. Each bearing force effect point On the same side of the bearing to the same place so called, also known series. When selecting this method to place focus on the production layout and ensure that each receives a load bearing can be as even as possible.
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 heat up and extend. In order to adhere to the axis change sensitivity; in the support layout depiction; in the satisfaction of the axial positioning accuracy requirements together Also consider the need for the shaft to be elastic and elastic. The method of axial positioning and axial elasticity corresponds.
The bearing clearance is adjusted to control the working accuracy of the shaft. The axial azimuth adjustment of the shaft is to satisfy the special requirements of some meshing transmissions. For example: in the worm drive; the worm axis needs to fall in the center plane of the worm gear to ensure its Correct meshing; therefore, the worm wheel shaft can be adjusted in the axial direction. In the bevel gear transmission; the pitch cone cones of the two bevel gears need to be coincident; therefore, both bevel gear shafts can be axially adjusted.
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