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What are the hazards of deep groove ball bearing lock failure

Update:30-12-2020
Summary:

Deep groove ball bearings are the most common type of b […]

Deep groove ball bearings are the most common type of bearing, and their applications are also very extensive. If the installation method is improper during the installation of deep groove ball bearings, not only will the reliability of the bearing be reduced, but also the early failure of the bearing will occur. For example, bearing lock failure, what damage will deep groove ball bearing lock failure cause to the bearing?

During the use of a certain type of deep groove ball bearing, a bearing lock failure occurred, which caused the deep groove ball bearing to fail to stop rotation. Let’s take a look at the damage to the bearing after this bearing lock failure?

Damage 1. After the deep groove ball bearing is locked, it is found that there are obvious rotating friction marks on the inner and outer diameters of the bearing. In the use of the bearing, the inner diameter and the shaft are in interference fit, and the outer diameter and the mounting shell are in clearance fit, and rotating friction The traces should be caused by sliding friction between the inner diameter of the bearing and the shaft, and between the outer diameter of the bearing and the mounting housing during the bearing operation, from the rotation stagnation to the complete lockup.

Damage 2. The bearing cage was broken. After the deep groove ball bearing was locked, it was found that there were five breaks in the non-printing surface cage, one of which was exposed with steel balls, and the typing surface cage was broken in four places. Under normal working conditions, the steel ball drives the cage to rotate, and the force of the steel ball on the pocket is negligible. If the bearing does not operate normally, the internal steel ball will abnormally collide with the cage pocket wall, causing the cage to operate. Unsteady, swinging and jumping occur. During the operation of the faulty bearing, due to the large axial load, the steel ball will have an abnormal collision with the cage pocket, causing the cage side beam to generate periodic tensile force, causing fatigue cracks and then breaking.

 

 

Damage 3. After removing the sleeve, check the surface quality of the groove of the deep groove ball bearing ring. The groove of the inner ring is biased to the side of the big letter end, peeling off seriously along the circumferential direction, accounting for half of the groove width. The outer ring channel is biased to the side of the typing end, and the peeling along the circumferential direction of the channel is also very serious, which also accounts for half of the channel width.

Deep groove ball bearings mainly bear light and medium radial loads, and can also bear certain axial loads, but excessive axial loads will increase the load of the ball and raceway, causing the bearing to fail, and the working track of the failed bearing is not The central position of the raceway of the ferrule, therefore, will eventually cause serious spalling of the inner and outer raceways of the bearing.

Damage 4. Deep groove ball bearings have a total of 14 steel balls. When the bearing locks up and fails, it is found that the bearing steel balls are all blue, and the surface of 4 steel balls is severely peeled off, and the surfaces of the remaining steel balls also have different degrees damage.

The deep groove ball bearing bears additional excessive axial load during operation, and the working track of the steel ball deviates from the normal position, which increases the contact load of the steel ball and increases the frictional heat, resulting in abnormal temperature rise. Under the action, the size swells, the clearance becomes smaller, and the steel ball squeezes the cage, causing the retention to form a fracture. At the same time, the steel ball is seriously peeled off, and the bearing is finally stuck.

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