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Working clearance is an important quality index of spherical roller thrust bearings

wallpapers Tech 2020-12-07
Working clearance is an important quality index of spherical roller thrust bearings, and also an important parameter in bearing applications. In actual use, the working clearance of the bearing will affect the load distribution, vibration, noise, friction torque and life of the bearing. Improper working clearance of the bearing will cause damage to the equipment.
 
The working clearance of the bearing is too small
 
If the working clearance of the bearing is too small, the friction torque of the bearing will be increased, which will generate a lot of heat, which will easily cause the bearing to heat and damage. This is because when the working clearance of the bearing is too small, it will lead to poor lubrication of the rolling elements of the bearing and the inner and outer rings of the bearing. Dry friction generates a lot of heat, causing wear, cementation, and bursting of the inner and outer rings of the bearing, which will cause The bearing is damaged.
 
The working clearance of the bearing is too large
 
The excessive working clearance of the bearing is mainly caused by the excessive natural clearance of the bearing and the insufficient pressing force of the bearing. For example, in a high-speed reducer, when the natural clearance of the bearing is large, the working clearance is relatively large, which will cause the reducer to vibrate during operation and reduce the service life of the bearing.
 
Adjustment of the Bearing Clearance
 
The inner ring of the bearing is positioned by the shaft shoulder, and the outer ring is pre-tightened by the bearing glands on both sides. The axial clearance of the bearing is adjusted by the pre-tightening force of the bearing glands on both sides, taking into account the bearing clearance caused by heat To reduce, there should be a certain amount of clearance in the axial direction of the bearing. There is no relevant national standard for the axial clearance of the bearing.
 
In practice, the axial clearance is less affected by factors such as interference assembly and load operation. Therefore, during installation, the original clearance of the bearing is generally adjusted according to the standard.
 
Adjustment of radial clearance of spherical roller thrust bearing
 
The specific adjustment method: In order to facilitate the measurement, remove the glands on both sides of the bearing before adjustment, install the bearing on the bearing seat, cover the upper cover, and use a torque wrench to evenly tighten the 4 fastening bolts on both sides of the bearing, and pre-tighten the bolts The force can refer to the relevant regulations of the national standard. After tightening in place, use a feeler gauge to measure the measured value and compare the measured value with the standard value of the look-up table.
 
 

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