[ WapCar ] I believe everyone is familiar with steering wheels, but do you really understand such a seemingly familiar thing? Why does it turn so easily? Why is the vehicle's "turning direction" heavy when it is stalled? Is it the same thing that mechanical hydraulic power and electronic hydraulic power are written on the distribution list? Is electro-hydraulic assist and electric assist a concept? Today we will explain some types of steering assistance?
The definition of power steering in the textbook is to increase the external force to resist the steering resistance. In fact, it is a configuration that allows us to easily complete the steering when driving.When we were learning to drive, we felt that the steering wheel was heavy, the steering wheel of our favorite car was light, and the seemingly cute MINI to drive but feel like fitness are all due to the difference in the power steering system.
Below, let us classify and look at these power steering systems that often appear in the configuration table.
■ Steering "No Assist" With Basic Hand
The power of the arm mechanical power steering system uses the driver’s physical strength as the main power source of the steering system. Simply put, most of the power comes from the user’s shoulders and breath, all the power transmission components are machinery. At present, it has almost disappeared in the field of passenger cars, and it is only in service on micro-face vehicles.
Although its structure is simple and the cost is low, its power assistance is extremely limited, so it has almost disappeared from passenger cars at present, only occasionally appearing in micro-face models. Of course, if you want to experience this "primitive mechanical feel", you can also go to the kart hall to experience it.
■ "Special For The Old Three" Mechanical Hydraulic Assistance
Although mechanical power steering already has a certain boosting effect, people obviously will not be satisfied with the power-assisted feeling comparable to fitness. Therefore, mechanical hydraulic power with more obvious power-assisted effects was born. While retaining the mechanical power steering structure, it adds a hydraulic pump as a power source. Many years ago, the "old three" Fukang, Jetta and Santana commonly used mechanical hydraulic power.
In principle, it is very similar to the pure mechanical assist we mentioned earlier, except that the steering energy source is not only the driver himself, but also the power from the engine. The image is that from a monk carrying water to eat, into two monks carrying water to eat, so we drive mechanical hydraulic power steering models will feel lighter than the pure mechanical power steering models mentioned in front.
When the steering wheel is not rotating, the pressure in the chambers on both sides of the piston is consistent and in a balanced state. When the steering wheel rotates, the mechanical control valve connected to the steering column will open or close accordingly. The oil on one side will no longer pass through the hydraulic cylinder but will directly return to the oil storage tank, and the oil on the other side will continue to be injected into the hydraulic cylinder and the piston, there is a pressure difference between the two sides, which will be pushed under the action of hydraulic force, and then produce auxiliary force. At this time, we will feel that turning the steering wheel is less laborious.
Since most of its entire system is mechanical structure and few electronic systems, it is also characterized by maturity and stability, high reliability and wide application range. In addition, even if the vehicle's hydraulic system fails and loses power, it can still rely on the traditional rack and pinion mechanism for steering.
Advantages: less electronic systems, mature and stable technology, and high reliability. Even if the vehicle hydraulic system fails and loses power, it can still rely on the traditional rack and pinion mechanism for steering.
Disadvantages: It takes up a lot of space, consumes the power output of the engine, and in order to ensure the boosting effect, high pressure must be maintained in the pipeline at all times, and there may be a hidden danger of oil leakage later.