Bearing Design Calculations and Help

[Walther1522]

Hello All,

I am designing a bearing pack (which would be known as tandem arranged bearings from what I have read) for O&G industry and am having trouble finding suitable calculations for this application.
All I can find are calculations for choosing already existing bearings from manufacturers such as static and dynamic load capacity formulas which from my understanding arent to help in designing a bearing more so in what the dynamic and static load ratings are for your application so you can choose a suitable bearing form an existing catalog. For this application this is not very helpful.
What are methods for calculating the amount of rolling elements needed (in this case tool steel balls), and how many of a particular size?
Again all I have seen is on calculating load capacities an application requires which is used to select already existing bearings. I have found nothing on designing your own. Of course I am not trying to design a crazy geometry or any of that just regular 4 point contact races and would like to know what the max loads are for what I have designed.

Anything helps. Thank you in advance.

 

[BEMPE16524]

maybe this book has what you need in detail:
Ball and Roller Bearings: Theory, Design and Application, 3rd Edition
Johannes Br¿ndlein, Paul Eschmann, Ludwig Hasbargen, Karl Weigand

the only reference on the net that I can find is this one:

https://lnct.ac.in/wp-content/uploads/2020/04/ME-602_UNIT5-BEARING-DESIGNS.docx.pdf

R.Efendy

 

[Walther1522]

Thats actually very helpful. Thank you!!

 

[Steven_D_P]

There are ISO standards that explain how to calculate the ratings of bearings. ISO 281, ISO/TS 16281, ISO 76, ISO 15312, ISO TR 1281. There might be more.

 

[geesaman.d]

Rolling Bearing Analysis (2 vol) by Harris and Kotzalas.

I come from the side of avoiding custom bearings at all costs, so these books don't get used as much. But they discuss what you're trying to do including the full mathematical modeling of bearing internals.

Just curious: why aren't commercial bearings acceptable? Could you use the next larger and next smaller commercial size to bracket your bearings capacity?