If you have ever used a mechanical device without oil lubrication, you know the problems associated with it. Gear driven rolls are typically powered by helical gearing that requires a bath of oil in order to operate. Not only is the spent oil very toxic, but it is also expensive to maintain. A more environmentally friendly alternative is self-lubricating gearing. This gearing solution can reduce costs and eliminate the need for oil baths entirely. You can additionally click for more gearing solutions in this site. When selecting a lubricant, the correct viscosity is critical. JIS K 2001 lays out the viscosity grade of industrial lubricants. The ISO viscosity grade is expressed in Table 13.4. Gear oils can be selected according to the viscosity grade and usage. The powercore website or technical manuals are useful sources of information on the right viscosity for enclosed gear. The mean coefficient of friction between fluid and solid lubricated gears is dependent on the thickness of the corresponding lubricant film in contact between them. Fluid lubricant film thickness is very small at low pitch line velocities, and increases with increasing pitch line velocity. The presence of water shear layer in the gear contact is another reason why fluid friction in lubricated gears is so low. To test a non-lubricated gear and roller, use a tool known as a machinist's layout lacquer. For optimum contact pattern, cover at least 100 percent of the active gear teeth under full load. Lift patterns can be photographed with a scotch tape and then mounted on paper. A permanent record of the patterns can be made with these measurements. There are many ways to test a non-lubricated gear and roller. Loss curves are plotted in two different ways: load-dependent and no-load. The first is called load-dependent loss and it changes with pitch line velocity (vt). The second is known as no-load loss. It shows the results of a load-dependent no-load loss curve. The load-dependent losses are influenced primarily by the lubricant additives used in the lubricant. Then the loss curves are plotted for load-dependent and non-load conditions. Water-containing fluids (PAO-09, PAO-05, and PAO-09) were tested against conventional gear oils. The kinematic viscosity of these fluids at 100 degC are shown in Table 3. While they have the same additives, the kinematic viscosities of the three water-based gear fluids differ. These water-based lubricants have higher densities than conventional gear oils. Check out this post for more details related to this article: https://en.wikipedia.org/wiki/Polymer.
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