Gears or helical gears with moderate speed and heavy load use ordinary vehicle gear oil. For example, transmissions and steering gears of models such as CA1091 use ordinary vehicle gear oil; gears working at low speed and high torque or high speed and low torque are not too harsh. For quasi-hyperbolic gears, select GL-4, such as BJ2022, EQ-1090E, EQ2090, and other transmissions; high-speed shock loads, high-speed low-torque and low-speed, high-torque gears and quasi-hyperbolic mild or harsh operating conditions The gears are GL-5, such as the transmission and main reducer of Jetta, Hongqi, Audi, Xiali, Shanghai Santana, Beijing Cherokee and other vehicles.
The gears of the main transmission of some heavy engineering vehicles are hyperbolic gears, the tooth surface pressure can reach (200 ～ 400) 104kPa, the tooth surface sliding speed can reach more than 8 ～ 10m / s, the oil temperature can reach 120 ～ 130 ℃, and contact at the same time The pressure is also very high, the main transmission of this vehicle uses GL-5 grade gear oil.
The viscosity of the gear oil should be selected according to the outside air temperature conditions. It is required that the maximum temperature of the selected gear oil when the viscosity reaches 150,000 MPa · s cannot be higher than the ambient temperature. 90 # gear oil can be used throughout the year in Jiangnan area and areas with a temperature of not less than -10 ℃ in winter; 140 # gear oil can be used only when the temperature is extremely high (or high power or diesel cars, etc.); Use 85 # ~ 90 # gear oil; 75 # gear oil should be used in winter when the temperature is below -26 ℃.
The performance of vehicle gear oil gradually deteriorates during use, and the replacement of vehicle gear oil usually uses regular replacement. Generally, domestic trucks travel 24,000km, and passenger cars 30,000 ~ 40,0000km change the gear oil once. Nanjing Iveco 8142.27S needs to change gear oil when driving 60000 ~ 65000km.