I'm doing an FMEA for Bearing that uses grease as the main lubrication.
I've identified several failure causes for bearing overheating (above 90 degrees Celsius):
3) Loose Fits
4) Loss of Lubrication (leakage)
5) Wrong Type of grease used
The assumption number 6, I want to ask:
1) in your experience, does vibration in bearing normally causes overheating?
2) In bearings, How is the vibration and heat relates to one another in the process of overheating? When the vibration goes above recommended limits, does the temperature also rises above the normal value (less than 90 degrees Celsius)? or when the bearing overheats does that mean it must also be vibrating above normal limits?
3) In what ways does vibration causes overheating? Because it is known that vibration is caused by many things such as misalignment, unbalance, mechanical looseness, etc.
Please share your thoughts regarding this.
NB: Would there be any other cause for bearing overheating other than those stated above? Excluding environmental cause and human error.