Requirements for lubricating grease in bearings

Requirements for lubricating grease in bearings

1. Needle penetration is mainly determined by the method of adding grease to select the size of the needle penetration, in order to add bearings, form a lubricating film, and prevent leakage. For oil centralized lubrication systems, in order to ensure the pumping performance of the system, the lubricating grease should be slightly softer, that is, with a higher penetration rate, generally above 270. The needle penetration of grease for manual oil guns and grease cups is 240-260.
When the load of dry lubricant on the shaft is high and the speed is low, lubricating grease with low needle penetration should be selected, and vice versa, lubricating grease with high needle penetration should be selected. Choose lubricating grease with low needle penetration and good mechanical stability for high-speed bearings.
2. The drop point should generally be 20-30 ℃ higher than the working temperature to avoid excessive loss and waste of lubricating grease due to temperature effects during operation. Simultaneously causing premature wear of bearings due to lack of grease. Under high temperature continuous operation, do not exceed the allowable operating temperature range of the lubricating grease.
3. If the working environment of the bearing is exposed to water and damp places, calcium based grease, calcium sodium based grease or high-temperature synthetic grease with water resistance should be selected.
If working in an environment with high temperature and steam, composite lithium (bearing grease or aluminum) base grease should be selected; When there are significant changes in the environment or temperature difference range for high-temperature and high-speed bearing grease, silicate grease with a wider temperature range should be used. High temperature and high-speed bearing grease
4. Bearings that bear extremely heavy loads should use lubricating grease with extreme pressure additives. If a longer service life is required, use lubricating grease with antioxidant additives.
If strict control of the ambient atmosphere around the bearing is required, less volatile lubricating grease can be used.