The mechanical efficiency of the motor is equal to the ratio of the actual output torque to the theoretical torque in its operating state. The empirical formula of the mechanical efficiency of the variable motor is as follows: In the above formulas, the laminar flow leakage coefficient is the laminar flow leakage coefficient, which is the inlet and outlet pressure difference, the oil dynamic viscosity, the pump rotation speed, the motor rotation speed, and the displacement ratio, which is the laminar flow resistance coefficient. The mechanical drag coefficient, which is a certain torque loss independent of the differential pressure and the rotational speed between the inlet and the outlet, is the pump's full displacement. Obviously, it decreases with the increase of the oil viscosity and the rotational speed, and increases with the increase of the load pressure difference. The total efficiency of the closed hydraulic system increases with the increase of the pressure; the total efficiency of the closed hydraulic system increases with the increase of the displacement ratio; the motor with the increase of displacement, the running speed decreases, and the efficiency increases significantly. The harshest working condition of a full hydraulic leveler is a high-speed sports car. At this time, the closed system has the lowest efficiency, and the system will generate a large amount of heat. Whether the cooling system can meet the requirements of sports car conditions will directly affect the reliability and life of the hydraulic system. Closed-system cooling calculation The closed-system heat dissipation power due to the total efficiency of the closed pump and motor's total efficiency is the required heat dissipation power for the closed system. When the closed-system high-speed sports car operating conditions, the efficiency is the lowest, the heat formula is inferred by the following formula, is the system's flow, for the heating power, closed system thermal balance calculation The closed system's heat mainly through the charge pump to fill the system Cool oil replaced with hot oil and taken away. If the surface heat dissipation and pipeline loss of the system components are not taken into account, the heat absorbed by the system's cold oil and the thermal oil in the system per unit time is the heat dissipation power of the system. Set the temperature difference between the cold oil and the hot oil in the system (unit is), then the heat absorbed by the cold oil per second is the heat dissipation power of the system, that is: where: - the hydraulic oil density, take the charge pump pump The flow rate, the specific heat of the hydraulic oil, the difference between the oil temperature in the closed system and the oil temperature of the tank is directly proportional to the working pressure of the system. For a given closed system, the amount of oil to be added and the total efficiency are basically unchanged within the normal working range. Therefore, the temperature difference between the oil temperature and the tank in the system mainly depends on the working pressure of the system, that is, the load of the system. Hard Cover Graphic Novel Printing Hard Cover Graphic Novel Printing,Hardcover Graphic Novels Printninjia Printing,Hardcover Graphic Novels Mixam Printing,Hardcover Comics Printninjia Printing Gold Union Printing , https://www.goldunionprinting.com