The selection principle of lubricating grease due to the different designs and conditions of various mechanical equipment, different requirements for lubricating grease are put forward. The basic requirements for selecting lubricating grease The purpose of quality lubrication is to reduce friction and reduce wear. The lubrication of lubricating oil can also absorb the heat generated by friction, reduce the temperature of the friction surface, and play a cooling effect.
Therefore, it is necessary to select different quality greases according to the operating conditions of the mechanical equipment. When choosing lubricants for mechanical parts, the lubrication system must also be considered.
Circulating lubrication systems particularly require the selection of lubricating oils with excellent oxidation stability and resistance to emulsification to ensure longevity and easy separation of moisture to remove mechanical impurities.
Choice of lubricating oil and grease:
Lubricating oil generally forms fluid lubrication. The two friction surfaces of the friction pair are completely separated by an oil film to reduce friction on the friction surface and reduce wear. At the same time, it has a cooling and temperature reduction effect. Therefore, lubricating oil is an important part of mechanical equipment lubrication.
Grease often adheres to the surface of friction parts of mechanical equipment, and is not easy to lose or slip off. Especially when the heat and mechanical effects are reduced or disappeared, the grease will gradually increase in viscosity and return to a certain increase in viscosity. Therefore, the choice of grease lubrication does not need to be added frequently. It has a certain protective effect and is suitable for some situations.
For example, high temperature or low temperature, load and vibration load, medium or low speed, intermittent or reciprocating bearings, especially mechanical equipment in a vertical position.
At the same time, the film thickness of the grease film is thicker than that of the lubricating oil, so it can prevent air, moisture, dust, and garbage from entering the surface of the friction part. Choosing the viscosity The viscosity of the lubricating oil is the basic element for forming the lubricating oil film. In the case of medium speed, medium load and temperature is not too high, choose medium viscosity grease. Under heavy load, low speed and high temperature, choose high-viscosity grease or grease with extreme pressure agent. Under low load, high speed, low temperature, etc., low viscosity lubricating grease is used. The choice of viscosity usually depends on the temperature conditions, but also consider the level of load, the size of the speed and the degree of wear of the engine.
