Low speed gears are prone to micro-contrast. Because its oil film thickness is very thin. When a low viscosity lubricant is used to lubricate a rough surface, it is likely to damage the gear teeth. Therefore, to avoid micro-conformation, a smooth tooth surface, a high viscosity lubricant and a high rotational speed are required to obtain the maximum oil film thickness. When the maximum contact temperature of the gear reaches a critical value, gluing may occur when working in the boundary lubrication area.
Gluing is controlled by the total contact temperature Tc. This temperature is the sum of the gear overall temperature Tb and the flash temperature Tf, that is, Tc = Tb Tf. The overall temperature of the gear is the equilibrium temperature of the tooth surface before entering the meshing zone, and the flashing temperature is the local instantaneous temperature of the gear teeth due to frictional heat when passing through the contact zone.
Lubricants acting as high-viscosity lubricants or smooth surfaces help to increase the oil film thickness, while the increase in film thickness in turn reduces the frictional heat and thus the flash temperature, which also removes heat from the gear teeth. . Anything that reduces the overall temperature or flash temperature of the gear will reduce the overall contact temperature and ease the gluing. In the design, the method of optimizing the geometrical parameters of the gear can be utilized to maximize the resistance to gluing. If the bending strength is required, the gear teeth should be as small as possible to reduce the temperature rise caused by the sliding.
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