The appropriate amount of grease for fillingrolling bearings

When the bearing is removed, the grease isimmediately extruded from the inner cavity of the local phase. From the startof the car, about 40% of the grease from the tapered roller bearing to the hubis thrown out, and the centrifugal pump bearing is thrown out 10-30%.Therefore, in the rolling bearing body or the shaft housing gap filled withgrease, be sure to select a minimum necessary amount. Too much packaging greasein the bearing is not good, especially at high speed, too much grease comesfrom strong mixing, which will also cause the temperature to be too high, butcause leakage. If the grease is too large or not enough, the bearingtemperature will be high, and the continuous operation of the bearing cannot beguaranteed. The general grease filling amount in the rolling bearing can bereferred to the following standard: 1, the general bearing can not be filledwith grease, so as to put 1/2 to 3/4 of all areas of the bearing inner cavity;2, the level bearing fill the inner cavity area of 2/3 ~ 3/4; 3, verticallymounted bearings fill 1/2 (above), 3/4 (below) of the inner cavity area; 4, ina very easy to pollute the environment, for low speed or medium speed bearings,to the bearing and bearing box in all indoor space covered; 5, the fast bearingshould be soaked in high-quality lubricating oil and turbine oil before loadinggrease, to prevent the failure of the bearing due to insufficient lubricatingoil on the friction surface when starting. Generally, about 95% of the greaseis in the bearing box, less than 5% of the grease is in the bearing, and thegrease directly in the dovetail guide rail is less than 1%. The grease strandsformed by this 1% grease can ensure the rolling bearing to work for a longtime. Therefore, it is very important to determine the amount of grease fillingin the rolling bearing. The grease on the rolling bearing maintenance framebasically does not participate in the lubrication of dovetail guide rail androlling theory. The grease must be moved on the surface of the rolling rest,and there is likely to be a small amount of continuous local exchange of greasebetween the static grease near the rolling body and the grease film attached tothe rolling body surface. It is less likely that the grease in the bearingthrow ring will fall into the rolling body and dovetail guide rail. All typesof anti-wear greases can generally be used in the rolling shaft, but theambient temperature used must be taken into account. However, in view of theapplication range of high temperature environment and low temperature, it isnecessary to do in-depth analysis before selecting the appropriate grease.Grease is a kind of plastic body, which is very easy to flow in the bearing,generally speaking, it relies on the false condensate of lubricating oil in thegrease to lubricated, but the long-term operation will cause lubricatingdefects due to the continuous precipitation of lubricating oil. In addition,because the molecular thermal movement makes most of the grease extruded by thebearing, only a very small amount of grease lubricates the bearing, so it mustbe filled and replaced with new grease at certain intervals. What's more, theapplication of grease has a certain service life, and due to poor lubrication,mechanical parts will be damaged. There are many factors that endanger theservice life of grease in bearings, usually bearing size, structure, usetemperature, load, speed ratio, natural conditions and so on. Therefore, it isdifficult to clearly adjust the use period of grease. The scientific researchwork on the service life of rolling bearing greases is being done all over theworld. Generally, it is carried out long-term running test in the bearing benchtesting machine under different environmental temperature, speed ratio, loadand other factors to simulate the service life of the grease.