Main performance viscosity of bearing
Main properties of bearing grease:
◆ base oil viscosity
The lubricating performance of grease depends on the viscosity of base oil, which is very important for the formation of lubricating oil film. Generally, the viscosity of base oil used for rolling bearings is generally in the range of 15 ~ 500mm2 / S (40 ℃).
If it is higher than 500mm2 / S (40 ℃), the lubrication is insufficient, and if it is higher than 1000mm2 / S (40 ℃), the base oil is difficult to precipitate from the grease. The bearings will not be lubricated. If it is lower than 15mm2 / s, it will not be easy to form oil film.
◆ consistency
The ability of lubricating grease to resist deformation under the action of external force is called consistency. The consistency is measured by penetration, and the brand of grease is also expressed by penetration grade. The brighter the penetration, the greater the consistency of the grease, the higher the bearing hardness of the grease and the worse the fluidity. Penetration (or brand) is divided into nine levels. Among them, the penetration suitable for bearing is generally grade 1, 2 and 3, while grade 2 application is more common.
