Stability is essential for rolling bearing grease

Stability is essential for rolling bearing grease

         For high-speed rolling bearing, the qualitative and the following will be discussed grease into drainage is very important, in order to replenish the grease mechanical stability and which will be discussed a canal is very important for hair grease fill abandoned machinery stability and a canal, as well as to overcome the centrifugal force.

Problems plastic viscosity greater than the viscosity of the grease base oil, and grease film has significant elasticity, so its resistance to loads greater than the base oil. As long as the proper viscosity base oils, greases anti-load capacity is not a problem. Under extreme pressure lubrication or boundary lubrication conditions, mainly rely on additives to improve wear resistance and extreme pressure performance to meet the lubrication requirements.

In order to properly use grease, grease in the bearing must know the movement. Movement in the rolling bearing grease filling, with the rotation of the bearing, can be divided into two phases. Under normal circumstances, bearing in grease filling amount, always exceeds the actual requirements directly involved lubricated bearing 盍 in the early stages, most of the grease quickly (less than one minute) was out of the raceway , and accumulate in the cage and into the bearing cavity cover and form a contour in the periphery of the rolling elements. In this process, Lu, because the excess grease resistance, bearing temperature quickly rises. Although most of the excess grease in the initial operation namely extrusion, and crowded raceway annex grease also still be rotating between the rolling elements into the rolling road. These greases at the same time as the rotation of the bearing circulation, have a small amount to be discharged. At this time bearing Timor degree still continue to rise until the excess grease all been discharged so far, go together can be called stage grease, the grease in the bearing structure according to quality, filling volume and other factors, this period may last ten minutes , or even hours.

When the excess grease is completely discharged, leaving a small amount of grease in the rolling elements, raceways and maintain contact with each other face frame, a thin film layer of grease membership form a wedge effect, to enter the normal 盍 bearing stage. Then the temperature was gradually lowered and reaches an equilibrium state. In other words, long-term lubrication, mainly relying on this layer of grease film to bear. In addition, long-term operation of the process of the bearing, the rolling elements and raceway contour nearby and holder of grease to shrink and separate the part of the base oil, flowing into the rear roller between road, lubrication also have some complementary role .

The opening of various profiled grease in the bearings is not the same, must be formed relatively quite on the draft outline, go together a short time, in the long run in bearing temperature is low, and smooth, this is an ideal grease, so is particularly important for the grease into drainage.

In addition, some so-called vortex type grease is not the case, difficult to form contours, even form the contour is also easy to collapse, then repeated back to roll excess grease hang in long columns situation stirred strong torque bearings, high temperature and uneven, and it may cause noise, grease also perishable and loss.