In order to reduce the energy consumption during friction, a friction modifier has recently been added to the gear oil. It relies on polar groups in the molecule to form an adsorption film by physical or chemical adsorption on the metal surface to reduce the friction coefficient. Commonly used friction modifiers are fatty acids, fatty alcohols, fatty acid soaps, hydrazines, fatty amines, fatty guanamines, and sulphonic and vegetable oils. When the working temperature of the gear oil increases, the additive adsorption film begins to desorb, and the desorption temperature is related to the sub-structure. Generally, the desorption temperature of alcohol and acid is lower, below 130 ° C, while the fatty amine can reach 150 ° C, and the fatty guanamine can reach 170 ° C.
Different additives are added to the industrial gear oil, and they interact with each other. The combination of certain additives produces a synergistic effect and some additives can interfere. Obviously, due to competitive adsorption, the addition of an anti-corrosion additive to the aluminum alloy ladder prevents the extreme pressure anti-wear additive from reacting with the metal surface to form a film, thereby reducing extreme pressure and abrasion resistance. The selection of industrial gear oils is the most important choice for ensuring the operating parameters of the equipment, extending the service life of the equipment and improving the economic efficiency of the enterprise. The selection of the variety and viscosity grade of industrial gear oils is first of all, the types of gears are different, the shape and the meshing mode are different, and the formation of lubricating oil membranes has obvious differences. Generally, spur gears, bevel gears, helical gears, herringbone gears and spiral bevel gears easily form an oil film on the tooth surface. Therefore, the corresponding working conditions are relatively moderate.
The worm gear tooth surface has a relatively high sliding speed and a large frictional heat, and a high viscosity gear oil with a friction modifier is used. In addition, if the tooth surface is rough, a higher viscosity gear oil should be used. The working condition of the gear refers to the temperature, running speed, transmission power, load bearing and impact load of the gear during operation. Generally speaking, high-viscosity gear oil should be used for higher working temperature; low-viscosity gear oil should be used for gears with high running speed; anti-oxidation and anti-rust gears can be selected when gear transmission power is small, load is low, and there is no impact load. Oil; gear transmission power is large, and when there is impact load, extreme pressure industrial gear oil should be used; if the contact stress of the tooth surface is greater than 10N/mn12 inch, heavy industrial gear oil must be used.
The environmental conditions for gear operation refer to the ambient temperature at the time of gear operation and whether it is easily contaminated by water. If the gear is likely to start at a lower temperature, consider the pour point and low temperature viscosity of the gear oil. If the gear oil is highly susceptible to water contamination, the anti-emulsification and water separation performance of the gear oil should be carefully considered. Problems and Solutions Occurred in the Use of Gear Oils Industrial gear oils may deteriorate due to changes in temperature, load, operating conditions, and foreign matter, or may cause many problems due to improper oil selection or operation. Solved in time.
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