In order to find out why hydraulic oil of construction machinery can not be used as lubricating oil, we must first know what lubricating oil is and what hydraulic oil is. Next, let us explain what lubricating oil is and what hydraulic oil is.
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Lubricating oil
Lubricating oil is a kind of lubricant, which is between two relatively moving objects and has the function of reducing friction caused by contact between two objects. In addition, it also has the function of cooling, rust prevention, cleaning, sealing and cushioning. Lubricating oil is divided into diesel engine lubricating oil and gasoline engine lubricating oil, each of which has different grades to choose from.
Hydraulic oil
hydraulic oil is a hydraulic medium used in hydraulic system using liquid pressure energy, which plays the role of energy transfer, antiwear, system lubrication, anticorrosion, rust prevention, cooling, sealing and so on. Hydraulic oil is a kind of special oil which transmits pressure (power). It can be divided into common hydraulic oil, antiwear hydraulic oil and low freezing point hydraulic oil. The hydraulic oil of construction machinery is a special oil of hydraulic system developed according to the actual working environment requirements of construction machinery and die casting machine. Compared with other hydraulic oils, hydraulic oil of construction machinery has better wear resistance, rust resistance, emulsification resistance, oxidation resistance stability, hydrolysis stability and thermal stability.
The similarities and differences between hydraulic oil and lubricating oil of construction machinery
From the above explanation, we can see that lubricating oil and hydraulic oil also have the functions of anti-wear, cooling, rust prevention, cleaning, sealing and so on. And this is the main reason why we often hear about hydraulic oil that can be used as lubricating oil.
The main function is different in the main function, lubricating oil and construction machinery hydraulic oil are still different. The main function of lubricating oil is to reduce the damage caused by object friction to machinery, and the main function of hydraulic oil of construction machinery is to transfer pressure (power).
The difference of emphasis is precisely because of their different main functions, so lubricating oil pays more attention to the function of reducing friction, slowing wear and preventing metal sintering, while hydraulic oil pays more attention to viscosity index, which requires hydraulic oil to have good performance at high temperature to ensure easy flow and reduce energy consumption at low temperature.
Summary
Although there is something in common between hydraulic oil and lubricating oil, it is anti-wear, cooling, rust-proof, cleaning, sealing and so on. But there are many differences between them, and it is these differences that prevent hydraulic oil from being used as lubricating oil. If there is a special indication that hydraulic oil can be used as lubricating oil, that is a different matter. Therefore, at the end of the article to remind friends of the construction machinery industry, hydraulic oil can not be used as lubricating oil.
