What causes a bearing to burn out?
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The bearings used in our factory’s crushers always burn out after being in use for a while. The bearing model is 22248, which belongs to the C3 series of bearings with a large clearance; they are imported SKF bearings, so there should be no issues with their quality or installation. After new bearings are installed, they perform well, but they burn out after 4–5 months, requiring frequent replacements. I would appreciate it if anyone could help analyze what might be causing this problem. I suspect that the issue lies in the fact that the rated load of the bearings chosen during the design phase is too low, but I’m not sure how to calculate the load that a bearing can handle. Thank you! ! !
Based on your description, it’s likely that the selected load is too low. The load consists of axial and radial components, and the lifespan of the SKF bearing is calculated using its parameters; standard formulas for calculating bearing lifespan can be used. For more accurate results, you can go directly to SKF’s official website and enter the relevant data.
If the poster is not involved in bearing manufacturing, it is recommended to consult SKF’s technical experts! You need to clarify the working conditions! It’s better for everyone to work together to analyze the reasons! Based solely on the above, it’s difficult to provide a definite answer!
It is recommended that the poster consider the following: 1. Compare the actual load on the bearing with its equivalent load; 2. Check the operating conditions of the bearing, such as temperature and sealing conditions; 3. Examine the axial positioning of the bearing
How is the bearing handling during use, and is there no cooling mechanism for the bearing temperature control? :)
Factors such as the load on the bearing and bearing lubrication, as well as the tolerance fits between the bearing and the shaft and hole, need to be taken into consideration. It is not easy to find solutions when the data is incomplete.
When a bearing burns out, whether the load applied is sufficient is a key factor; in addition, factors such as the structural design, the quality of lubrication, and heat dissipation conditions must all be taken into consideration to determine the cause of the burnout.
1. Lack of oil 2. Improper assembly 3. Water ingress 4. Incorrect model
The load is small; I’m okay with communicating with the manufacturer
Based on the owner’s description, there seems to be an issue with the design of the bearings, which is causing them to have a short lifespan. The bearings in crushers are subject to high loads and significant impact forces, which should be taken into account when calculating their service life.
There might be an issue with the lubrication method. If the lubrication of the bearing in question is insufficient—(1) is the lubricant properly applied fresh? ； (2) Whether the heat generated by bearing friction can be discharged in a timely manner – these two objectives may be related to the lubrication method. :handshake Last edited by LINGHURUIKANG on 2009-3-15 00:11]
A crusher is a vibrating machine, so the burning out of its bearings is likely caused by an unstable installation position of the bearings. That is, when gap vibration occurs in the bearing housing, the bearing deviates from its installed position, which prevents it from functioning properly (e.g., misalignment-induced wear, as well as excessive heat that can cause the bearing to burn out).
This is related to both the design of the device and the workload; you need to carefully check how your device is performing.
Our factory also has two crushers, and the problems with the bearings are similar to those described by the original poster. We should mainly consider the operating conditions of the equipment! There are mainly the following reasons: 1. Lubrication conditions; 2. Working load conditions. The workers in our factory pay no attention to the machine’s capacity limits, and they use forklifts to pile large amounts of calcium carbide at the feed inlet.
First, consider whether the working load of the crusher is too high, whether the vibration levels are above the acceptable range, and whether there are significant shock forces during operation. Is the bearing well-lubricated?
The operating conditions are too harsh; dust and impurities that get into the bearing lubricant accelerate the wear and damage of the bearings. 1. Protect the bearings from dust, 2. Perform regular maintenance on the bearings.
It can be approached from two aspects: 1. Using better lubricants, 2. Improving the lubrication method to enhance its effectiveness
Do you regularly measure the temperature of the bearings to check whether the temperature rise is within normal limits? Does a burned bearing result from a sudden increase in temperature or a gradual one?
I think it’s mainly caused by insufficient lubricant pressure, too high temperatures, as well as operating under overload for extended periods of time.
This post was last edited by jyszyx on 2009-5-12 at 12:19. I think there might be 3 reasons: 1. Poor lubrication； 2. No cooling ； 3. Withstand uneven loads