Why Should Only One Bearing Support Axial Loads?

In summary, it is not considered good engineering practice for both bearings A and B to support both axial and radial loads in a shaft. This is because it can lead to conflicting loading and make it difficult to control factors such as endplay and length adjustment. It is more efficient and economical to have one bearing handle both axial and radial loads while the other only supports radial loads. This also allows for easier maintenance and adjustment. Additionally, finding a roller bearing for the job is typically more cost-effective than an angular contact bearing.
  • #1
YongzZ
2
0
Hello,

does anyone know why for a shaft with 2 bearings A and B, why is it not good engineering practice for both bearings to support axial and radial loads? while it is better if one supports axial and radial loads while the other bearing only support radial loads.
 
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  • #2
If you have two bearings that are taking up axial loads, they will have a tendency to fight each other when it comes to sharing the loading. A common set up is to have one bearing take both axial and radial loads and the other to control the concentricity of the shaft by just taking radial loads. This way one bearing has to worry about endplay, etc...while the other bearing allows for things like length adjustment or expansion due to heating by not constraining the shaft in two directions.

The other reason is economics. It is usually cheaper to find a roller bearing for the job than an angular contact bearing.

Here's a nice introductory article that talks a bit about this issue:
http://www.engineeringtalk.com/news/skf/skf137.html
 
  • #3
Thank You!
 

FAQ: Why Should Only One Bearing Support Axial Loads?

Why is it not good engineering practice to have two bearings supporting axial and radial loads?

Having two bearings supporting both axial and radial loads can cause issues with stability and alignment. This can lead to premature wear and failure of the bearings, as well as increased friction and energy consumption.

Can't two bearings handle the load better than one?

While it may seem like having two bearings would distribute the load more evenly, in reality it can actually cause uneven loading and put unnecessary strain on the bearings. This can lead to premature failure and decreased efficiency.

What is the alternative to using two bearings for axial and radial loads?

The best engineering practice is to use a single bearing designed specifically for handling both axial and radial loads. These bearings are designed to distribute the load evenly and provide better stability and alignment.

Are there any exceptions to this engineering practice?

In some cases, using two bearings may be necessary due to space limitations or other design constraints. However, it should be avoided whenever possible and careful consideration should be taken to ensure proper alignment and balancing of the bearings.

Can using two bearings for axial and radial loads cause safety concerns?

Yes, having two bearings can increase the risk of bearing failure and potential accidents. It is important to follow good engineering practices to ensure the safety and efficiency of the equipment.

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