Small lubrication knowledge question and answer

Small quizzes, 2019 - lubrication 04 - Q1:24 gear oil used in the temperature high what reason be? A1: closed gearbox gear lubrication, for example, if we do not consider the factor of machine itself, the cause of the high temperature may be: 1, the new gear mechanism without running in good. In abrasive wear ^ cause tooth surface temperature. At this time should strengthen the filter, after running-in oil change. 2, large load, oil membrane rupture, such as wear failure tend to cause tooth surface temperature rise, at this time must be correctly chosen according to the load situation of oil, increase viscosity grade or choose type extreme pressure gear oil. 3, the oil level is too high or viscosity is too large, increased the LAN with hot and heat dissipation difficulties. 4, the oil temperature and tooth surface temperature rise. At this time should be to reduce the oil level, choose suitable low grade of oil. Q2: the high temperature of compressor motor and lubricating oil what harm is there? A2: in the operation of compressor normal calorific value should not overheat. Normal electrical heating, compression heat and friction heat in the design of the compressor were done serious consideration, and the corresponding cooling measures. Make use, in the practical use, however, because of their power supply is not normal, motor overload, refrigerant leakage, motor temperature caused by condensation pressure is too high, such as high exhaust temperature, lubricating oil anxious burnt overheating phenomenon is also common. 1, long overheat. Will not only reduce electrical insulation performance and reliability, shorten the motor life, but also can reduce the performance of lubricating oil lubrication, and even cause oil carbonization and acid solution. 2, lubricating oil lubricating ability will be greatly reduced after carbonization, will cause the crankshaft, connecting rod, piston, piston ring and so on serious wear and tear. Can appear even, locked-rotor phenomena such as card cylinder, and holding shaft wall by bow I connecting rod broken accident. 3, carbide oil also carbon on the valve plate and valve plate, the cause valve leakage and valve plate fracture. 4, lubricating oil acid will rot in the candle of the enameled wire winding, to reduce the winding insulation. 5, acidification oil still can cause copper plating phenomenon. Q3: 'high viscosity is not low' view is correct? A3: this view is not comprehensive. Choose high viscosity is not low, which is beneficial to in fluid lubrication state to improve the oil film strength, supporting load and shock absorption and sealing effect, but due to the viscosity produced greater friction resistance, more dynamic energy consumption. Modern industrial gear oil contain efficient additives, often of the temperature in gear lubrication and the boundary lubrication state of lubrication film can be formed, thus the guarantee under the condition of thin film lubrication, with low viscosity lubricating oil is better for energy saving as much as possible. Lubricating oil of low viscosity lubricating oil on current international is an important trend of development, but to what extent on earth is reasonable, should through the experiment and practice.