Similar viscosity is an important basic characteristic of lubricating grease, which has a great relationship with the performance of lubricating grease in machinery.

    Lubrication When lubricating bearings and other friction parts, its friction replaces the solid friction between the friction surfaces of the parts. Therefore, the viscosity of the grease has a great influence on the power of the machine using the grease. If the viscosity of the grease used is higher, obviously the friction loss is higher.

    The nature of lubricating viscosity changing with shear speed makes it particularly suitable for use in machinery with frequently changing speeds. When the speed is high, the viscosity of the lubricant is required to be low. At this time, the damage of the lubricating grease is intensified, the fibers are oriented, and the viscosity just changes. When the rotation speed is slow, the viscosity of the lubricant is required to be higher, and the viscosity of the grease is higher when the shear speed is low. The change of the grease viscosity with the shear speed basically meets the requirements of the lubricant viscosity with the change of the mechanical speed.

    The viscosity of the grease at very low shear speeds has a lot to do with the start-up of the lubricated friction parts. Since the viscosity of the grease is high when the shear speed is small, if the viscosity of the grease is too high at this time, the starting resistance will be increased. Especially at low temperature, the viscosity of the grease increases, which will affect the low temperature starting, and even cause difficulties. In fact, at mechanical start-up, the force required to overcome the flow resistance of the grease at small shear rates is much greater than the force required to overcome the strength limit. For example, the shear stress limit of a lithium grease at -40°C is greater than 686.5Pa (7gf/cm2), and its flow resistance is 2452Pa (25gf/cm2) at the same temperature at 2.5S-1. It can be seen that the grease is in The viscosity at low temperature shear rate has a great influence on the low temperature start-up performance of lubricating grease. For low temperature or wide temperature range greases, its low temperature viscosity needs to be specified.

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