How does grease play a lubricating role in motor bearings?

Small and medium-sized motors are usually installed with rolling bearings, and the bearings need to be lubricated during the long-term operation of the motor, so how does the grease work in the motor bearings? Here I introduce it to you.

When the lubricated bearing starts to run, the grease is first discharged from the rotating element and is rapidly circulated and cooled in the bearing cavity sealed by the bearing cover. Then, from the outside of the rotating bearing collar cut into the rotating element, under the shear effect, near the surface of the rotating element grease part is pulled out of the fibrous network structure, so that a small amount of lubricant precipitation in the rotating element and collar surface, forming a layer of lubricating film. The residual grease component still has the original fibrous mesh structure, which acts as a sealing and cooling mechanism.

When the motor bearing begins to run, the turbulent flow of grease generates frictional heat that raises the bearing temperature to its highest point. With the continuous shearing action of the lubricant precipitated, the frictional heat gradually decreases after a lubricating film is formed on the rotating element, bearing seat and bearing collar of the bearing.

The constant spray of grease from the rotating elements also helps to cool the bearing cavity, which helps to gradually reduce the bearing temperature until it approaches equilibrium. The grease in the motor bearing acts like a liquid, always flowing within the sealed bearing cavity, rather than relying on the grease adhering to the metal surface to function. To prevent abnormal temperature increases in the bearing, it is repeatedly sheared and cooled as it is constantly thrown out of the rotating element into the bearing cavity and back into the rotating element from within the cavity. Given this, grease must be poured into the motor bearing to maintain a specific amount of space; typically, the grease fills only one-third of the cavity, leaving the rest of the space empty to ensure that the grease in the rotating element is completely cooled and returned for temperature control purposes. However, the grease cannot be filled to a level that prevents it from returning to the rotating element, which would leave the bearing under-lubricated.

The above is the principle of bearing lubrication introduced to you by Vshida Micromotor, for more related information, please continue to pay attention to us