NEWS： High-load operation of the bearing lubrication products How to choose

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SKF bearing lubrication effect
Lubrication on the fatigue life of rolling bearings and friction, wear, temperature, vibration, etc. have a major impact, not normal lubrication, bearings will not work. Analysis showed that the cause of bearing damage, bearing damage and about 40 percent are related to poor lubrication. Therefore, well-lubricated bearing is an effective measure to reduce the bearing friction and wear. In addition, bearing lubrication as well as cooling, rust, seal, easing the impact of a variety of effects, the role of bearing lubrication can be briefly described as follows:
a. In between the two rolling surfaces or sliding surfaces in contact with each other to form a layer of the film second surface spaced from the contact surface to reduce friction and wear.
b. When When using oil lubrication, especially the use of circulating oil lubrication, oil mist lubrication and spray lubrication, lubricants can take away most of the heat inside the bearing friction, play an effective cooling effect.
c. When using grease lubrication, can prevent external dust and other foreign matter into the bearing, play a role in the closure.
d. lubricants have to prevent metal corrosion effect.
e. extend the fatigue life of the bearing.
Grease lubrication
Grease is the lubricant base oil, a thickener and additive composition. When selected, you should select well suited to the conditions of use lip bearing grease, due to the different brands, the performance will also be very different, so choose the time, we must pay attention. Bearing grease commonly used calcium-based grease, sodium grease, calcium sodium based grease, lithium grease, aluminum grease and molybdenum disulfide grease.
Number of bearing grease filled, to fill the space inside the bearing 1 / 2-1 / 3 as appropriate. It should reduce speed to 1/3. Excessive grease will rise higher.
SKF bearing grease selection
When selecting grease in accordance with the operating temperature, the main indicators should be dropping point, oxidation stability and low temperature performance, dropping point is generally used to evaluate high temperature performance, bearing the actual operating temperature should be below the drop point 10-20 ℃. Synthetic grease temperature should be below the drop point 20-30 ℃.
When the SKF bearing grease selection based on load, should be selected for heavy small penetration grease. In addition to the penetration of small, but also has a high film strength and extreme pressure performance when working under high pressure.
According to the environmental conditions when selecting grease, calcium-based grease easily soluble in water, suitable for drying and less water environment.
Oil lubrication
At high speed, high temperature conditions, for grease lubrication oil lubrication can no longer suited. By circulating lubricating oil, you can take a lot of heat. Viscosity is an important characteristic of the lubricating oil, the viscosity directly affects the size of the oil film thickness between the flowability and lubricant friction surface formed at the bearing operating temperature of the lubricating oil viscosity is generally 12-15cst. ??The higher the speed should be selected low viscosity, load more weight should be selected higher viscosity. Commonly used lubricants machinery oil, high-speed machinery oil, turbine oil, compressor oil, transformer oil, cylinder oil.
SKF Bearing oil lubrication methods include:
a. oil bath lubrication
Oil bath lubrication is the most common method of lubrication, suitable for low and medium-speed bearing lubrication, part of the bearing is immersed in the tank, lubricating oil by the rotation of the bearing parts brought up, and then back into the sump oil should be slightly less than the minimum Rolling central body.
b. drip lubrication
Drop lubrication suitable lubricants requires rationing was bearing member, drip every 3-8 seconds to drop the amount is generally advisable, too much oil will cause the bearing temperature increased.
c. circulating oil lubrication
The filtered oil pump oil to the bearing part by lubricating the bearing cool down after use and then filtered. As the circulating oil can be taken away some of the heat, the bearing cool down, therefore the method suitable for high speed bearing components.
d. Spray lubrication
With dry compressed air and lubricating oil are mixed to form mist sprayer, spray bearings, air can effectively cool the bearing and to prevent intrusion of impurities. This method is suitable for high-speed, high-temperature lubrication of the bearing components.
e. spray lubrication
The high-pressure oil pump oil through the nozzle onto the bearings, bearing the incident through the other end of the bearing oil into the tank. When the high-speed rotating bearing, rolling elements and cage are also fairly high rotational speed so that the ambient air stream is formed, it is difficult with the general method of lubricating oil to lubricate the bearings, then the lubricant must be sprayed with a high pressure jet method to the bearing, the position of the nozzle should be placed between the inner ring and the cage holding center.
SKF bearing solid lubricant
In some special conditions, a small amount of solid lubricant added grease, such as adding the 1st 3 to 5% molybdenum disulfide to reduce wear and improve compressive heat resistance, for high temperatures, elegant, high vacuum, corrosion-resistant , anti-radiation, and other special conditions of very low temperature, the solid lubricant is added to plastic or powder metallurgy materials, can be made with self-lubricating properties of the bearing parts, such as by adhesive bonding in the solid lubricant raceway, the cage and rolling elements, form a lubricating film, reducing friction and wear have a certain effect.

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