In order to make the miniature bearing function well, first of all, to choose suitable for conditions of use, the purpose of lubrication method.
If only consider lubrication and oil lubrication.
But there are grease lubrication can simplify the miniature bearing specialty of surrounding structures.
Miniature bearing lubrication method, divided into grease lubrication and oil lubrication.
The comparison of grease lubrication and oil lubrication: 1, grease lubrication (
1)
Shell grease filling quantity of shell grease filling amount, according to the bearing rotating speed, the shell structure, space, volume, grease brand, using the gas and different environment.
Do not allow the visibility of the temperature rise of the bearing spindle, less filling grease, general standard roughly as follows: first of all, will fill the bearing grease inside, at this point, the cage guide surface also fortress into the grease.
Then, for besides the bearing and the bearing shell internal space volume according to the following quantity of filling grease.
1/2 ~ 2/3 (
Limit rotating speed is less than 50% of cases)
1/3 ~ 1/2 (
Limit of rotating speed by more than 50% of cases)
（
2)
The complement of the grease and replaced even if high quality grease, after a period of use, can also occur aging performance, lubricating performance degradation.
So be appropriate to add grease.
Generally, a grease filling, can long time don't need to supplement.
But there are also due to the conditions of use, need often added grease, grease or replaced.
Add grease should as far as possible for the same type of grease, adding grease, is particularly important should guarantee the new grease into the bearing internal indeed.
2, oil lubrication (
1)
Oil bath oil bath method is more general lubrication method for low speed, medium speed rotation.
Oil area in the center of the lower roller in principle.
Had better install oil level gauge in order to confirm the oil level.
（
2)
Drip oil drip oil supply, more used in high speed rotation of small ball bearings, etc.
（
3)
Splash splash oil drainage method, it is not directly immersed bearing in oil, use the gear rotary reincarnation turn around splash, to make the method of bearing lubrication.
Widely used in automobile gearbox, differential gear device.
（
4)
Cycle oil supply for cooling oil bearing part of the high speed rotating, or around the use of high temperature conditions, use cycle for more oil.
（
5)
Jet fuel supply jet fuel supply, cooling effect is good, used for high-speed, heavy load bearing.
（
6)
Spray oil spray oil, is to use air makes lubricating oil mist, onto the bearing lubrication method.
Its advantages are as follows: (
a)
Due to the lubricating oil quantity is little, so stirring small resistance, suitable for high speed rotation;
(
b)
From the few oil bearing parts, so less equipment, products of pollution;
(
C)
Can often provide a new lubricant, extend the life of the bearing.
Therefore, spray oil supply method used in machine tool of the high-speed spindle, high speed rotary pump, rolling mill roll neck with bearing lubrication.
（
7)
Oil and gas drainage method of oil and gas oil supply, it is to use quantitative piston intermittently spit out the trace of lubricating oil, by mixing valve will slowly introduce lubricating oil in the compressed air, continuous processes, to provide bearing lubrication method.
