Three minutes to understand industrial gear oil
Release time: 2023-05-10
Gear transmission is an important form of mechanical transmission. There are a variety of transmission methods, the more commonly used are: mechanical transmission, gas compression transmission, electric transmission and hydraulic transmission. Although the mechanical transmission has: speed difficulties, difficult operation, complex structure, large motion inertia, pulse and other shortcomings, but as a traditional transmission mode has its irreplaceable position, so far in the industrial machinery and equipment is still indispensable.
Industrial gear oil, according to the ISO 6743.6 office G8 76317 industrial gear lubrication standard: industry is used for wheel or full wheel opening, and the function of wheel transmission is to change the rotation speed of the rotating part), and the transmission of the mixing wheel rod It is to change the direction of the rotating parts.
The difference between industrial gear oil and vehicle gear oil
1. The occasions for use are different. The former is used for tooth sliding of national industrial equipment, while the latter is used for sliding of mobile vehicle-mounted wheel boxes. In other words, the ring temperature used by the latter is higher, and it is also a mobile equipment. The high temperature requirement is relatively high. Therefore, the vehicle-mounted wheel oil needs to be divided into multiple levels and single levels.
2. Medium-load and heavy-load vehicle wheels are generally double-headed gears, which are higher than those of industrial wheels that are usually in round shape or shape. Therefore, the bearing capacity of medium-load vehicle wheel oil is equivalent to that of heavy-load industrial gear oil. Therefore, medium-load vehicle wheel oil of equivalent viscosity grade can replace heavy-load industrial gear oil such as 90 GL-4 or 85W/90 GL-4, which can replace 220 CKD.
3. The viscosity grade of vehicle gear oil is classified according to the provisions of SAE of American Society of Automotive Engineers, and the kinematic viscosity at 100 ℃ is measured. The industrial gear oil is classified according to the provisions of the International Organization for Standardization ISO, and the kinematic viscosity is measured at 40 ℃. Substitutions are therefore subject to conversion.
In terms of classification, ISO only specifies the classification symbol C of industrial gear oil, and does not specify the grouping symbol of vehicle gear oil. China adopts API usage GL-3, GL-4 and GL-5 classification.
Characteristics of industrial gear oil
1. Appropriate viscosity and good viscosity-temperature. Viscosity is the basic nature of gear oil. The formation of hydrodynamic film and elastic fluid lubrication film is closely related to the viscosity of gear oil. The viscosity of oil is large, and the thickness of oil film is formed, and the ability to resist load is large. If the viscosity temperature is good, the degree of viscosity change with temperature change is small. The change of oil film thickness is also small.
2. Sufficient extreme pressure and abrasion resistance. The oil with good extreme pressure and abrasion resistance will form boundary adsorption film or chemical reaction film under high speed, low speed and heavy load or impact load of gear mechanism. Can prevent tooth surface wear, abrasion and glue.
3. Good oxidation stability and thermal stability. When gear oil is working, it is in contact with air, metal, and impurities. Under the condition of high temperature, it is easy to oxidize and deteriorate, which shortens the service life of the oil.
4. Good anti-emulsification. Gear oil work, often the possibility of contact with water, oil and water mixed, prone to emulsification deterioration.
5. Good anti-foam. The gear transmission system with a circulating oil tank is agitated during operation, which is prone to foam, thereby reducing the actual working oil volume, which affects heat dissipation, or causes oil film damage and increases mechanical wear.
6. Good rust and corrosion resistance. Oil oxidation products or due to the role of additives often cause gear corrosion, and the presence of water vapor makes the metal rust.
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