1 import generic low-noise motor bearing grease
In the bearings industry, the largest application of this grease, with the total fat content of 70%. Since this type of grease used the fiber soft and easy to do filtering of lithium soap thickener, use mineral oil as base oil, it is easy to meet the medium and low value of imported bearings to reduce vibration requirements. Another advantage is a good pumping, whether mechanical grease, or hand-painted resin, are simple and easy. Moreover, the grease of the low price, can greatly reduce the cost of imported bearings. However, due to the use of mineral base oil, so that such grease rust and corrosion protection in a number of other physical and chemical indicators greatly reduced. Such as the bearing life can only import up to 200 hours, starting and running torque test at -20 ℃ will have difficulties. Type of grease temperature is generally -20 ~ 120 ℃, when used in high temperature above 150 ℃, the base oil will be rapid evaporation, loss and serious phenomenon, greatly shorten the life of bearings.
(2) low-temperature high-speed imported bearing grease
Currently, the use of increasingly sophisticated equipment imported bearings refinement, led by imports of bearing grease used must have the following properties:
(1) and bearings with the same operational life, and extend maintenance intervals, reduce downtime, improve labor productivity.
(2) dn> 5 × 105 to ensure that the motor speed under low temperature, do not dump oil, thereby reducing power consumption to protect the motor.
(3) the impurity content under control to a certain standard, the maximum noise reduction equipment for environmental pollution.
(4) working conditions in the ultra-low temperature starting and running bearings to ensure the flexibility, to ensure minimum power output.
Grease foreign high-purity chemical companies to use synthetic oil and special additives, cleanliness in the high environmental and equipment developed and produced a low-temperature high-speed bearings with grease. The disadvantage of this type of grease is used in more than 150 ℃, its life as the temperature rises sharply, anti-impact ability to load and relatively weak, should be avoided in large-scale use of imported bearings, lubrication and to prevent the border produce sintering.
3 long life low noise, high temperature grease bearings
In the high-temperature grease used in high-speed environment should have the following characteristics:
(1) at high temperatures without loss, that is about 180 ℃ in temperature to maintain a certain consistency, not softening.
(2) oil leaks less. When the grease in the bearings to withstand repeated high-frequency cut-and-large centrifugal force, the lubrication can not promptly thrown back into the raceway.
(3) have a certain type of high-temperature grease life at high temperatures with good oxidation resistance, thereby prolonging the import of the life of bearings and related equipment.
(4) has a certain quietness, due to high temperature grease hardness of the fiber is generally larger, so the imported bearing noise test performance in quiet is far less than lithium grease.
High-temperature long-life grease is generally divided into two types of lithium complex grease, the high temperature performance is better, but because of its low molecular weight thickener in acid crystals added to increase the hardness of the larger fibers in Bearing vibration performance is poor in performance. However, by controlling the degree of polymerization, molecular weight distribution of a class to get the resultant, the resultant special methods of this type of dispersed oil in the base, they made another noise performance and excellent high temperature performance of the same grease.
This grease is greater than the Pingjun drop point 250 ℃, temperature up to 200 ℃ or so, the thickening agent does not contain metal ions in the crystal, fiber stiffness smaller, the noise performance is good. Also, because of its basic chemical components with the thermal coupling between the effect of reducing high temperature grease. This high-temperature high-speed low-noise grease does not contain anything that can cause oxidation and catalytic metal ions, and rich in nitrogen and oxygen atoms of the thickening agent is an anti-oxides, so the bearings service life and better sound quality than the .