A universal low-noise motor bearing grease
    This grease in the bearing industry, the total fat content 70%. These greases use soft fiber easily filtered lithium soap thickener, the use of mineral oil as the base oil, and it is easy to satisfy the requirements of the middle and low bearing reduces vibration value. Another advantage of having a good pumpability, whether mechanical fatliquoring, or hand-greased, are simple. Moreover, the price of the grease is low, the bearings can be greatly reduced cost. However, due to the use of mineral base oil, the type of grease on some of the physical and chemical indicators to rust and rust resistance greatly reduced. Bearing life can only reach 200 hours, starting and running torque test at -20 ℃ when there are difficulties. The general type of grease to use temperature -20 ~ 120 ℃, when the high temperature above 150 ℃, base oils evaporate too quickly, loss and serious phenomenon, greatly shorten bearing life.
    Low speed bearing grease
    Currently, the use of precision bearings device increasingly refined, prompting the bearing grease used must have the following properties:
    (1) and bearing the same operational life, try to extend the maintenance cycle, reduce downtime, improve labor productivity.
    (2) dn> 5 × 105 high-speed, to ensure that the motor temperature rise, not dumped oil, thereby reducing power consumption, and protect the motor.
    (3) impurity content is controlled under a certain standard, the maximum to reduce device noise pollution of the environment.
    (4) bearing the flexibility of starting and running, ultra-low temperature operating conditions to ensure minimum output power.
    Abroad grease selection of high purity chemical synthetic oil and special additives, high cleanliness of the environment and equipment development and production of low-temperature, high-speed bearings with grease. The disadvantage of such grease is used at more than 150 ° C, as the temperature increases its life dramatically decreased resistance to load and impact is relatively weak, should be avoided in large bearing on the case due to boundary lubrication sintering.
    High long-life, low noise bearing grease
    The grease used in high temperature environment should have the following characteristics:
    (1) no loss at high temperatures, i.e., in a temperature of about 180 ℃ keep a certain consistency, not softened.
    (2) oil leak less. When the grease in the bearings to withstand high frequency repeatedly cut and great centrifugal force, the lubrication timely reflux is not thrown to the raceway.
    (3) the service life of these greases have a certain temperature, at high temperatures with good antioxidant capacity, thereby prolonging the life of the bearings and related equipment.
    (4) mute, mute performance is far better than lithium grease in the bearing noise test fiber general hardness of the high-temperature grease.
    High temperature long life grease is generally divided into two, a lithium complex grease, hot weather performance, but due to the crystallization of the thickening agent in low molecular weight acids added to its increased hardness of fiber in The performance of the bearing vibration performance is poor. However, by controlling its degree of polymerization, to obtain a molecular weight distribution uniform product, such product is dispersed in the base oil, particularly, will be made of another source of noise the same excellent performance and high temperature performance grease. The the average dropping point of this grease is greater than 250 ° C, use temperatures up to about 200 ℃ gelatinizer crystallization does not contain metal ions, fiber hardness smaller, good noise performance. Also, because the thermal coupling between its basic chemical composition, thereby reducing the high-temperature grease. This high temperature does not contain a high-speed low noise grease can cause the metal ion for catalysis and oxidation, and the thickening agent is also an antioxidant containing abundant nitrogen oxygen atom, bearing life and with better sound quality. Table 1 is a major foreign companies sealed bearings with grease.


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