Grease lubricated bearings and other friction parts, based on its internal friction instead of the mechanical friction between the surface of solid friction. Therefore, the viscosity of the grease to grease the machinery power consumption has a great influence. If you are using grease viscosity is clear that the friction loss will be more.
Grease viscosity with the shear speed on the nature of the change, making the use of the mechanical speed change frequently have special adaptability. When the high speed requirements of the lubricant viscosity is low, when the destruction has exacerbated the grease structure, fiber orientation, just a low viscosity. When the slow speed requirements of the viscosity of the lubricant, while the grease in the viscosity at low shear speed. The grease viscosity with the shear speed of change in line with the requirements of the mechanical speed changes on the lubricant viscosity.
Grease lubricated friction components start in the hours the viscosity of the shear speed. As the grease hours viscosity in the shear speed, so at this time such as grease viscosity may increase the starting resistance. Especially at low temperatures, the viscosity of the grease increases, and even make cold starting to be affected, and even cause difficulties. In fact, the start of the machinery to overcome the grease in the flow resistance of the force required to shear speed hours is much greater than to overcome the ultimate strength of the force required. For example, a lithium grease in the shear stress limit of a 40 ℃ not more than 686.5Pa (7gf/cm2), while at the same temperature, the flow resistance in the 2.5s-1 2452Pa (25gf/cm2), thus visible viscosity for low temperature starting performance of the grease, the grease in the low temperature and low shear speed. Low temperatures or wide temperature range grease to the provisions of its low temperature viscosity.
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