electricpete
Electrical
- May 4, 2001
- 16,774
Title should have been: can overfilling a horizontal sleeve bearing motor cause increased oil addition frequency
I know that on a vertical motor if you overfill the oil, it can result in increased rate of oil loss from the upper bearing which would necessitate increased oil addition frequency per time. The explanation the initial overfill provides a wicking path over the standpipe which allows oil to continue to flow in that path even as the level lowers.
My question is if similar phenomenon applies to horizontal sleeve bearing motors (where the design is that the oil level is below the shaft and oil ring brings the oil over the shaft so it can fill the bearing inlet distribution groove).
Specifically: would routinely filling the oil level too high (for horizontal sleeve bearing motors) increase the required number of oil additions per time? (and if it does, what would be the mechanism)
I know (for horizontal sleeve bearing motoRs) we want the proper oil level for a variety of reasons including proper operation of the oil ring. But my question is not whether or not we should fill to proper level (of course we should). My question here is whether filling to a level which is too high results in need to fill more often, and if so why. If you want to know why I'm asking the question, it's because in order to cope with excess oil addition rate, we started adding oil while running (rather than secured) in order to avoid taking the motor out of service, and the target oil level is not as well defined when the motor is running (all OEM markings for all level are static markings).
So for the question (would routinely filling the oil level too high for horizontal sleeve bearing motors increase the required number of oil additions per time?) my thought is that it should not. My thinking is that excess filling may create increased oil loss initially if erratic oil ring operation causes splashing which creates more droplets and mist that might find there way through seals. But at some point the level is going to drop and at that point I don't see the mechanism for the initial overfill to have any lingering effect to caused increased oil loss. There is no wicking / creepage path from the sump up over a standpipe like there is for vertical motors.
What do you think about that question?
=====================================
(2B)+(2B)' ?
I know that on a vertical motor if you overfill the oil, it can result in increased rate of oil loss from the upper bearing which would necessitate increased oil addition frequency per time. The explanation the initial overfill provides a wicking path over the standpipe which allows oil to continue to flow in that path even as the level lowers.
My question is if similar phenomenon applies to horizontal sleeve bearing motors (where the design is that the oil level is below the shaft and oil ring brings the oil over the shaft so it can fill the bearing inlet distribution groove).
Specifically: would routinely filling the oil level too high (for horizontal sleeve bearing motors) increase the required number of oil additions per time? (and if it does, what would be the mechanism)
I know (for horizontal sleeve bearing motoRs) we want the proper oil level for a variety of reasons including proper operation of the oil ring. But my question is not whether or not we should fill to proper level (of course we should). My question here is whether filling to a level which is too high results in need to fill more often, and if so why. If you want to know why I'm asking the question, it's because in order to cope with excess oil addition rate, we started adding oil while running (rather than secured) in order to avoid taking the motor out of service, and the target oil level is not as well defined when the motor is running (all OEM markings for all level are static markings).
So for the question (would routinely filling the oil level too high for horizontal sleeve bearing motors increase the required number of oil additions per time?) my thought is that it should not. My thinking is that excess filling may create increased oil loss initially if erratic oil ring operation causes splashing which creates more droplets and mist that might find there way through seals. But at some point the level is going to drop and at that point I don't see the mechanism for the initial overfill to have any lingering effect to caused increased oil loss. There is no wicking / creepage path from the sump up over a standpipe like there is for vertical motors.
What do you think about that question?
=====================================
(2B)+(2B)' ?