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NTN bearing with grease quantity control - bearing knowledge
by:Waxing
2020-06-15
NTN bearing lubrication is necessary, so all things have, how to control the quantity of NTN bearing lubrication for NTN bearing maintenance budget is very useful.
We know that the grease has good adhesion, abrasion resistance, temperature tolerance, rust and lubricity, and can improve the high temperature oxidation resistance, delay aging, can dissolve carbon deposition, prevent poly metal abrasive dust and oil pollution, the improved mechanical wear, pressure and corrosion resistance.
Understand the movement process of NTN bearing grease, will naturally draw a conclusion: NTN bearing of unfavorable and overmuch grease.
More grease is not only waste, but is harmful.
NTN bearing the higher the speed, the greater the harm.
The more grease filling amount, the greater the friction torque.
The same filling amount, sealed NTN bearing friction torque is greater than the open NTN bearing.
Grease filling amounts to 60% of the NTN bearing internal space volume, friction torque no longer increases obviously.
This is due to open in the NTN bearing grease has been most extrusion, and sealed the grease of the NTN bearing have also been dropping.
With the increased amount of grease filling, NTN bearing linear temperature increase, the same filling amount, sealed NTN bearing temperature rise is higher than the open NTN bearing.
It is generally believed that hermetic scroll NTN bearing grease filling amount, shall not be more than about 50% of the internal space.
Shawki and Mokhtar test showed that ball NTN bearing, 20% to 30% in the most appropriate.
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