By High torque cycloidal hydraulic motor According to the structure of, the skeleton oil seal on the shaft is immersed in the high-temperature oil drain all the time, and is installed with the working pressure of the oil drain passage. Because the internal leakage of the pump or motor will cause the temperature of its shell to be higher than the temperature of the gear oil in the car oil tank, the high temperature is likely to cause the embrittlement of the skeleton oil seal made of organic materials, which will reduce or lose its ductility, thus leading to oil leakage. However, according to the statistical analysis, it is found that in the hydraulic motor with oil leakage Hydraulic transmission Most of them are in the system, but in fact, the temperature of the hydraulic motor in the open system software is higher than that in the closed system software. Because the hydraulic motor in the closed system software is generally installed with a desuperheating flush valve

It is not difficult to see that the cause of the hydraulic motor oil leakage in the closed system software is not the embrittlement of the skeleton oil seal caused by high temperature. Because the skeleton oil seal is not resistant to high pressure, the working pressure of oil drainage will rise when the residual oil is discharged greatly or the oil drainage channel is blocked. from 2K hydraulic cycloid motor According to the technical documents, the allowable working pressure for oil drainage is generally below 0.3MPa, and the allowable pressure for a short time is 0.6MPa. Because the motor in the closed system software has a flush valve on it, the residual oil drain of its motor is composed of cleaning oil and internal oil drain. Such additional cleaning oil drain is likely to increase the working pressure of the oil drain pipeline, which will lead to overpressure of the skeleton oil seal and oil leakage.