How to Choose an Oil for Rolling Element Bearings

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Understanding Lube Oil Selection for Rolling Element Bearings
This video provides an in-depth discussion on lubrication for rolling element bearings, contrasting it with plain bearings and explaining the concept of hydrodynamic and elasto-hydrodynamic lubrication. It highlights the importance of selecting the correct lubricant viscosity to combat fatigue wear and extend bearing life, discussing the factors influencing film thickness, the calculation of kappa ratio, and the choice between oil and grease based on application requirements. Additionally, it outlines considerations for the lubricant's chemistry and compatibility with bearing materials, including the impact of additives on different bearing types.
00:00 Introduction to Lubrication for Rolling Element Bearings
00:12 Understanding Hydrodynamic and Elasto Hydrodynamic Lubrication
01:10 The Role of Viscosity in Lubrication
02:50 The Impact of Fatigue Wear on Rolling Element Bearings
04:43 The Importance of Viscosity Selection
05:16 Calculating Lubricant Film Thickness
07:10 Understanding the Kappa Ratio
09:12 Choosing Between Oil and Grease for Lubrication
11:41 Rules of Thumb for Lubrication Selection
12:14 Selecting the Right Chemistry for Lubrication
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5 авг 2024

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Комментарии : 11

@danielbustillos8573 4 месяца назад

Great video, thanks for sharing your expertisse.

@vitorcesar5392 5 месяцев назад

Amazing explanation.

@imperatormouse2735 5 месяцев назад

Would be good to see such a video on engine oils

@chippyjohn1 28 дней назад

He has made several

@bdykes7316 5 месяцев назад

One factor with rolling element bearings that I have not been able to understand well is how an increase in grease viscosity will increase rolling resistance, but this resistance increases heat generation and temperature, decreasing viscosity and friction. The calculators I have used make this calculation an iterative process and it is hard to grasp the relative changes of each variable. Do you have any suggestions?

@OklahomaLubeDude 3 месяца назад

There was something published a few years ago that may help you expand on this. Just do a search for "Prediction of the Stribeck curve under full-film Elastohydrodynamic Lubrication". It's an expansion of Stribecks work on the journal bearings.

@bdykes7316 3 месяца назад

@@OklahomaLubeDude Thank you. I will read it.

@rolandotillit2867 5 месяцев назад

Is it bad practice to use assembly lube or grease on say, tapered roller bearings when they'll be operating with a much lower viscosity fluid during service?

@averyalexander2303 5 месяцев назад

Great question. A thick ish oil certainly wouldn't be bad since oil gets very thick in extreme cold anyways and that doesn't cause damage, but I could see how grease may be bad although I'm no expert. Whenever I've replaced bearings in transmissions and such (which hasn't been very many times), I've always just lubed them with whatever oil they normally use because they were going right back into service. As long as the machine will be put into service reasonably soon, there's nothing wrong with just using their normal oil as an assembly lube.

@user-nw4dw1zl9u 5 месяцев назад

HI.CAN YOU MAKE A VIDEO ON THE SIGNIFICANCE OF ALKALIZED NAPHTHALENES IN OIL..FOR EXAMPLE LIKE 10-20% ADDITIONAL I WOULD LIKE TO KNOW MORE ABOUT THAT BECAUSE I THINK IT IS THE FUTURE OF MOTOR OILS

@LubricationExplained 5 месяцев назад

This video is an example of a lesson from the MLA I course that's available on lubrication.expert Join the community to continue your professional development in the industry!