What does Lmhr refer to?
What does Lmhr refer to?
(OP)
I recently got a quote for a gearbox. It listed the L10 life for the bearings and also the Lhmr life. I assume the Lhmr life is an adjustment to L10 life based on operating conditions, but I had never seen that term before. Searches on the internet haven't turned anything up. Can anyone provide more information or direct me to a source?





RE: What does Lmhr refer to?
I would reguest from your gearbox manufacturer the formula they use for the Lhmr calculation so that you can compare it to other standards to make sure you are comparing apples to apples.
RE: What does Lmhr refer to?
Phil
RE: What does Lmhr refer to?
Several of the other results may be of interest to you.
The web site does not explain much but might get you in the ballpark. Harmonics can have a definite effect on mechanical components.
Hope it helps ---
RE: What does Lmhr refer to?
Something you may not be aware of, the Lhmr or Lhna rating can be higher then the L10 life. The L10 life only takes into account the load on the bearing and the new life calculations can have a correction factor greater then 1 if the lubrication is very clean and there is a sufficient film thickness between the rolling elements and races. As an example, if the bearings are lubricated by a filtered oil system, the oil quality will be higher then for a sump and lead to longer life due to the level of contamination buildup in the sump system.