How To Choose Industrial Gear Oil?
The selection of industrial gear oil should mainly consider the following factors:
1. Temperature: When the temperature drops, the lubricating oil will thicken. When the temperature rises, it becomes thinner. Therefore, a low viscosity lubricating oil is required under low temperature conditions, and a heavy oil is required under high temperature conditions to prevent dry friction between metal and metal. Low temperature selection of thin oil with small viscosity number, high temperature selection of heavy oil with large viscosity; at the same time, it must be considered that the pour point of gear oil should be 3-5 °C lower than the ambient temperature.
2. Speed: The faster the sliding and rotating speed, the less time it takes to squeeze the lubricant between the gears. At the same time, the lubricating oil is more likely to agglomerate and thicken under high-speed operation. Therefore: high viscosity (heavy oil) for low speed and low viscosity oil (slight oil) for high speed.
3. Load: Heavy oil is more resistant to heavy loads and impact loads. In addition to viscous oils, oils with extreme pressure additives provide better protection for gears at the same viscosity, such as L-CKD heavy duty industrial gear oils from Great Wall.
4. Impact load: For example, the rhythm force emitted by the engine, which requires thicker oil to prevent the boundary lubrication caused by the instantaneous fragmentation of the oil film, because only a small amount of lubricating oil can be left. In this case, a lubricating oil containing an extreme pressure additive (EP) is required.
5. Gear type: When spur, helical, herringbone and bevel gear pairs are used, sliding and turning produce effective oil film formation to slow direct contact between the engaged teeth. On non-equal shaft drives such as turbine worms and hypoid gears, the direction of relative sliding operation is not conducive to maintaining the oil film. On this transmission, boundary lubrication often occurs in a large amount. Therefore, there is still a need for still heavy oil on the turbine vortex device and the large eccentric amount of the hyperbolic gear transmission. When these transmissions are subjected to heavy loads and high pressures, it is necessary to select lubricants with high oil film properties (high viscosity), smoothness, lubricity or even extreme pressure additives.
6. Moisture pollution: It is possible to select gear oils of the L-CKD type with good water separation performance in gearboxes that may enter the water.