What kind of oil is added to the steering gear of large vehicles?

[AlexandraDella]

Large vehicle steering gears use hydraulic transmission fluid. Functions of power steering fluid: Power steering fluid is primarily a medium oil added to the power steering system, serving to transmit steering force and provide cushioning. Essentially, power steering fluid is a type of hydraulic transmission fluid. As long as it meets the relevant requirements, it can be used. Many repair shops use automatic transmission fluid as a substitute. Nowadays, hydraulic power steering is becoming increasingly rare, gradually being replaced by electric power steering, and many vehicles no longer require this type of fluid. Power Steering: When a car is turning, the torque (steering) sensor "feels" the steering wheel's torque and the intended direction of rotation. These signals are sent to the electronic control unit via the data bus. The control unit then issues action commands to the motor controller based on the transmitted torque, intended direction, and other data signals. The motor then outputs the corresponding amount of rotational torque as needed, thereby generating power steering.