Trucks often need to change the driving direction during driving, so that the vehicle can drive to the destination according to the wishes of the driver. The mechanism used to change the driving direction of the vehicle is called the steering system, which affects the driving safety of the vehicle. If we find that the steering wheel becomes heavier and the steering sensitivity decreases during daily driving, it is likely that there is a problem with the power steering system in the steering mechanism.

● What is the power steering system? First of all, let's understand what is the power steering system. Power steering can help the driver to adjust the direction of the car and reduce the strength of the driver's effort to turn the steering wheel. At present, the most common power steering system on trucks is mechanical hydraulic power steering system, which mainly consists of hydraulic pump, oil pipe, pressure fluid control valve, V-shaped drive belt, oil tank, etc. This power assist mode is to convert part of the engine power output into hydraulic pump pressure to apply auxiliary force to the steering system, so as to make the tire turn. As the mechanical hydraulic power assistance needs to consume a lot of engine power no matter whether the vehicle turns or not, people have improved on the basis of the mechanical hydraulic power assistance. Baotou North Benz accessories have developed an electronic hydraulic power steering system that can save energy.

The steering oil pump of this system is no longer directly driven by the engine, but is driven by the motor. In addition, an electronic control unit is installed on the basis of the previous one, which can calculate the most ideal steering auxiliary force according to the driving speed, steering angle and other signals of the vehicle. Nowadays, more and more heavy trucks are equipped with electro-hydraulic power steering system.

When a part of the power assist system fails, it will lose the comfort and flexibility of steering control, increase the physical consumption of the driver, and fail to adjust the direction in time in case of danger.

● The power steering system has problems for these reasons

① Damage to the power steering pump: the power steering pump is the power source of the power steering system, which creates high pressure in the steering system and drives the steering gear. If the booster pump of Baotou North Benz accessory fails to provide normal working pressure for the system, the steering wheel will rotate hard.

② Insufficient hydraulic oil: if the power steering pump is compared to the heart, the hydraulic oil is the blood to maintain the normal operation of the whole system. The absence of hydraulic oil will not only cause difficulty in steering, but also make other parts of the system unable to achieve sufficient lubrication effect, and cause abnormal noise and wear.

③ Deterioration of hydraulic oil or impurities in the oil: the hydraulic oil has a certain service life. If it is not replaced for a long time, the hydraulic oil will easily deteriorate and the oil viscosity will increase. As a result, the oil flow in the pipeline is slow, the system performance is affected, the steering efficiency is affected, and even the booster pump is damaged.

④ There is air in the hydraulic pipeline: the oil reservoir is short of oil, the seal of the oil seal is not good, or the operation is incorrect when replacing the hydraulic oil, which will cause air to enter the power assisted system. If there is air in the hydraulic oil, it will be unstable when transferring torque. For example, when turning, the working power of the power steering system is interrupted, and the steering wheel is disconnected, so there is no air in the power steering device.

⑤ Filter element blockage: the filter element in the filter will be blocked if it is not maintained or replaced for a long time. When the filter element is blocked, the hydraulic oil will not circulate smoothly, and the return oil pressure will increase, which will also make the direction heavy, leading to oil leakage of the steering input oil seal and other faults.

● Afterword:

The above summarizes some cases of heavy steering caused by the failure of the power steering system. In addition to the power steering system, the wear of the steering gear, steering tie rod, steering knuckle and other mechanical parts will also cause heavy steering of the steering wheel. Careful inspection is also required in the daily maintenance of the vehicle to avoid accidents caused by insufficient steering capacity in an emergency.

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