Oil bath lubrication

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This topic has 4 voices, contains 4 replies, and was last updated by  steve12 699 days ago.

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November 4, 2011 at 3:59 am #236


Dear members
In one application Cylindrical roller bearings are lubricated by oil bath. Oil used is Castrol 90EP. (APIGL4/US MIL-L-2105). After 5 hours of continuous operation on full load, we observed the shaft did not rotate. On dismantling we found the oil in black color and oxidized. Probably bearing operating temperature had gone upto 120 C and caused the shaft to seize. We did not find any physical damage otherwise to shaft/bearing. We are now putting fresh oil. Also we are planning to monitor the rise in operating temp of oil bath.
(a) The lubricating life of the oil is causing concern. Is there any way we can improve the frequency of oil change. Because of design limitation, we could not resort to other types of lubrication system.
(b) How we can ascertain the life of the oil (frequency for oil changes).
Thanks in advance

November 4, 2011 at 8:28 pm #257


Due to the limited application information, I could only make general comments. If you will provide more details regarding the bearing part number, loads, speeds, amount of lubricant, and if EP lubricant is required, I will be able to give you a more detailed response.
Thanks for your question

November 9, 2011 at 1:47 am #280


Hullo Rick
In this application cylindrical roller bearings are used to support an excentric shaft at both ends.
The excentric shaft is rotated by hydraulic motor in two different speed settings viz. 1980 rpm in clock wise and 1680 in anticlockwise.
The centrifugal forces due to shaft eccentricity are 260 KN in clockwise and 340 KN in anticlockwise.
Bearing used is cylindrical roller bearing NJ2336 EX , ID 180mm, OD 380 mm and thickness 126 mm.
The quantity of oil in the bath is 21 litres, and in the assembly this much oil will level to the centre of the bottom most roller of the bearing.
The time share for the above loads are expressed as a percentage of the machine expected life of 10000 hours. This will roughly be 33 % clockwise, 33 % anticlockwise and balance the shaft will remain idle (no excitation).
I trust I have provided the required information. Please let me know should you need any other detail.
Thanks in advance.

November 16, 2011 at 10:20 am #300



My apologies on the delayed response. As this forum is generally for automobiles and commerical vehicles we’ve been trying to locate the correct person to answer your question.

Given that we still don’t know the machinery where the application/bearing is located we’re having some issues. It would be recommendation at this point that you discuss this with your local industrial distributor or feel free to contact your local Timken sales office. You can find information on both distributor locations and sales offices here: http://www.timken.com/en-US/purchase/pages/salesofficedistributorlocator.aspx.

Appreciate the inquiry and hope you can get the answer that you need.


May 21, 2012 at 8:24 am #399



Here is good apology.Appreciated your real inquiry system.

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