In the transmission system assembly, the cone bearing assembly is a difficult point in the whole assembly. The pre-tightening mode and the pre-tightening force of the tapered bearing directly affect the transmission state of the bevel gear and the transmission precision of the entire transmission system.
According to the bearing capacity, speed, working conditions, etc., a reasonable bearing preload is set to ensure the service life of the drive train. If the pre-tightening force is too large, the power consumption may even cause the bearing to overheat. If the pre-tightening force is too small, a gap will be generated between the rolling element and the inner and outer rings under the action of the load, so that the transmission shaft will bebated and swayed, the transmission precision will be reduced, the noise will increase, and the gear meshing will be affected, and the gear will be damaged in severe cases. Gear teeth and bearings.
The bearing is pre-tensioned at normal temperature, but under the working condition, the transmission shaft is slightly extended due to the increase of oil temperature, and the bearing pre-tightening force will also change. Therefore, when setting the pre-tightening force, it should be considered. This factor.
Second, the structural form of the cone bearing application
In tapered bearing applications, the typical structure is nothing more than the following three typical structures:
1. Directly pre-tightening the inner ring of the bearing
The bearing inner ring is pressed axially by the nut rotation to eliminate the gap between the inner and outer rings, and the bearing pre-tightening purpose is achieved.
Currently, the common method of achieving this goal: First, pre-tighten the bearing with a force much greater than the final assembly preload, and then return the nut back to 1/4 turn.
The assembly method has the advantages of less input, simple structure and practicality, and can be used under the premise that the quality of the bearing cone roll is good.
The disadvantage is: no quantitative data. In particular, under the condition that the cone roll has poor consistency, we will find that the pre-tightening force of the pre-tightening bearing is unstable according to the above method, and some are too large or too small, resulting in unstable assembly quality.
2. Gasket preload
By mating, the bearing clearance is eliminated and the axial preload is achieved.
At present, the general method of use: First, pre-tighten the bearing with a force much larger than the final assembly pre-tightening force, measure the axial dimension, and then subtract about 0.2mm to obtain the gasket value. This assembly method has the advantages and disadvantages as above.
3. Corrugated sleeve deformation preload
The bearing pretensioning is achieved by compressing the corrugated sleeve deformation.
At present, the common method: use the gas trigger to tighten the nut to a torque less than the lower limit, and then tighten the torque through the torque wrench, test the torque, then tighten, test, and alternate until the two torques are qualified.
This assembly method has the advantages of less investment and simple structure, and can be used under the premise of good consistency of the corrugated sleeve and the bearing quality.
The disadvantage is: no quantitative data. In particular, under the condition of poor consistency of the corrugated sleeve and the bearing, the tightening force is often too large, resulting in waste products, resulting in unstable product quality.
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