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Non-Lubricated Gear and Roller
When considering a new non-lubricated gear and roller, you will need to consider two factors: backlash and clearance. Backlash is the distance between the tooth of one gear and the base of the tooth of the opposite gear. Clearance is the difference between the height of the dedendum on one gear and the addendum on the opposite gear. For example, if the teeth of one gear are 2mm higher than the addendum of the other, the gear will have a clearance of two millimeters.
To measure DoD lubrication, the experiments were conducted using a twin-disk tribometer. The measurements showed promising results. This result was followed by experiments at the FZG gear efficiency test rig. Figure 12 illustrates the results. The measurements include total loss torques, tooth bulk temperatures, and contact voltages. The pitch point is referred to as the Hertzian pressure at pitch point. The results were presented for various speeds. Follow this link https://
Fluid film lubricants exhibit low fluid friction, while water-containing gear fluids exhibit high solid friction. A typical lubricant contains more than one compound, and each additive influences the lubricant film thickness differently. In addition, lubricant additives have a different influence on the total friction of gears. Fluid film lubricants are more effective than non-lubricated gear fluids for high pitch line velocities.
Gear and roller fluids are based on polyalkylglycols that contain water up to 70%. The kinematic viscosity of a gear or roller oil is about 30 times higher than the density of a conventional gear oil. Water-containing gear fluids are more expensive, but their higher density allows them to withstand the temperatures. They are often more durable and longer-lasting than conventional gear oils.
The corresponding losses in non-lubricated gears and rollers are best understood when analyzed under load. No-load losses are small, while no-load losses are high. The lubricant's influence on gear and roller losses can be seen as the kinematic viscosity of a fluid versus its density. For the latter, the difference is more significant when the gear fluid contains water. See page to get the facts about Non-Lubricated gear and roller.
Water-containing gear fluids exhibit lower friction and load-dependent losses than mineral oils. Water-containing gear fluids show lower frictional losses and heat balance. However, they have higher viscosity than mineral oils. Water-containing gear fluids demonstrate superlubricity at high pitch line velocities and low friction at low pitch velocities. When tested in a twin-disk rig, water-containing gear fluids exhibit low friction in the superlubricity regime. Kindly visit this website https://en.wikipedia.org/wiki/Lubricant for more useful reference.