The selection of high temperature lubricating oil should generally consider the following factors.
1. Proper viscosity
The most important thing as a lubricating oil for bearings is the viscosity of the oil at the operating temperature. During operation, the pressure needs to have sufficient viscosity. If the viscosity is not appropriate, power loss, excessive temperature rise, and combustion will occur.
2. Operating temperature
The lubricating oil must be selected according to the bearing temperature in operation. The ideal high-temperature bearing lubricant must be an oil with low viscosity and low pour point. In addition, when the bearing needs to be exposed to high temperature for a long time, the oxidation stability is high, the oil that is easy to volatilize and the oil that is not carbonized on the bearing. This situation is particularly important when refueling.
3. Bearing load
When the bearing load is large, the oil film on the bearing contact surface is easily broken, so sufficient oil film strength is required. In addition, when the load is heavy, it is necessary to use high-viscosity oil that can produce a strong oil film that is difficult to extrude.
4. Running speed
The operating speed should also be considered when selecting the appropriate lubricant. In order to rotate fast and prevent frictional resistance and temperature rise caused by viscous friction, it is necessary to select low-viscosity lubricants. In addition, in the case of a large-scale low-speed journal bearing that operates under a heavy load, high-viscosity lubricating oil is generally used in order to support the heavy load with an oil film.
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