Motor bearings use special motor bearing grease.
A long-life anti-wear grease refined from high-temperature-resistant synthetic oil thickened with special complex sulfonates and added with various additives such as extreme pressure anti-wear, anti-oxidation, and anti-corrosion. This high-load, anti-rust grease is designed for long-term lubrication of elevator traction machine bearings, guide rails and friction pairs that require high wear resistance and anti-rust properties.
It is the most widely used motor equipment grease. It can remain soft without hardening at low temperatures of -18°C. When the temperature drifts between 260 and 300°C, the grease will not thin into liquid and can Maintain long bearing life in high temperature environments. Applicable temperature range: -18～+260℃, the maximum intermittent temperature resistance can reach 300℃.
Extended information
The lubrication of motor bearings relies on the lubricating oil that precipitates when the three-dimensional fiber network structure in the grease is broken under shear. , a layer of lubricating film is formed on the bearing seat and bearing race to provide lubrication.
When the newly greased bearing starts to rotate, the grease is first thrown out from the rotating element and quickly circulates and cools in the cavity of the bearing cap.
Then the grease cuts into the rotating element from the outside of the rotating bearing race. The part of the grease that is close to the surface of the rotating element breaks the fiber network structure under the shearing action, causing a small amount of precipitated The lubricating oil forms a lubricating film on the surfaces of the rotating elements and races. The rest of the grease still maintains an intact fiber network structure, which plays a cooling and sealing role.
When the bearing first starts to rotate, the turbulence of the grease generates frictional heat, causing the bearing temperature to rise to a maximum value. Then, as the lubricating oil is precipitated by continuous shearing, and a lubricating film is formed on the rotating elements of the bearing, the bearing seat and the bearing race, the friction heat gradually decreases.
At the same time, the grease that is constantly thrown out from the rotating elements into the cavity of the bearing cover has a good cooling effect, so that the bearing temperature gradually decreases and approaches an equilibrium value.
It can be seen from the above working principle of motor bearing grease that the grease in the motor bearing does not rely on grease to adhere to the metal surface for lubrication, but acts like a liquid in the space of the bearing cover. The continuous circulating flow in the cavity means that it is continuously thrown out from the rotating element into the bearing cover cavity, and continuously returns from the bearing cover cavity to the rotating element, thereby repeatedly shearing and cooling, which ensures that the bearing does not Abnormal temperature rise occurs.
Baidu Encyclopedia-Motor Bearing Grease