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There are many kinds, brands and brands of hydraulic transmission oil. China's hydraulic transmission oil includes the industrial standards JB/T 7282-2004, JB/T 12194-2015, and the enterprise standard Q/SY RH2042-2001 (2009) of PetroChina. Each product brand has more than ten quality indicators, such as viscosity, condensation point, copper corrosion, and bubble resistance. It can be said that each indicator on the product quality standard and analysis sheet is indispensable. For hydraulic transmission oil in use, in addition to the above special indicators, Emphasis is placed on monitoring moisture and mechanical impurities. Generally, moisture is required to be no more than traces, and mechanical impurities are required to be no more than 0.01%.
Friction characteristics are the core and most important index of hydraulic transmission oil, which is the comprehensive balance performance of gear shifting feeling, torque load and friction durability. In the gearbox, shifting is accomplished through the engagement of the clutch. During shifting, the relative speed between the clutch plates changes from large to small until the relative speed is zero. In order to get a good shifting feeling, people hope that the clutch can transmit torque smoothly, which requires that the friction coefficient between the two clutch plates should not change with the speed and remain constant, and at the same time, in order to obtain greater transmission capacity, It is also required that the friction coefficient of the clutch plate should be as high as possible without increasing wear, and the friction durability should be better to ensure that the transmission of power will not be affected by the oxidation and decay of oil during the use of the gearbox. Generally, SAE No.2 friction testing machine and LVFA low speed friction testing machine are used to investigate the friction characteristics of oil products. Generally, hydraulic transmission oil requires that the ratio of dynamic and static friction coefficients of oil products be greater than 1 to improve the transmission efficiency. At the same time, there is a certain static friction coefficient to reduce clutch slip.
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