Four-wheel dynamic balance? /Four-wheel positioning?
When we go to the 4S store to maintain our car, we often see the following two words on the maintenance project, four-wheel dynamic balance and four-wheel Positioning. From the word, "Balance" and "positioning" seem to have the function of keeping the tire stable. It is also because of this that many consumers have a silly difference between "four-wheel dynamic balance" and "four-wheel positioning". Whether these two are the same thing or not, is there any inevitable connection between them?
First, we understand two concepts:
1. Four-wheel dynamic balance is aimed at tires and wheel hubs.;
2. The four-wheel positioning is aimed at the installation position between wheels, suspension and knuckle mechanic.
Apart from these two differences, we have a good understanding of these two maintenance procedures that make people feel confused.
What is "four-wheel dynamic balance"?
As mentioned above, four-wheel dynamic balance is aimed at tires and wheels. Careful people may find that there will be an object like a hook attached to the wheel on their wheels, which is actually a counterweight balance block. This kind of balance block sometimes hides inside the wheel for the beauty of the wheel hub.
Why is there such a balance? This is because the quality of the wheel can not be completely uniform, which will lead to unbalanced stress. In this way, abnormal wheel jitter and even abnormal wheel wear may occur when the wheel is running, the service life is short. Therefore, adding the balance block is to use the counterweight to make the mass distribution of the wheel uniform, so as to keep the wheel running smoothly and normally.
The so-called "four-wheel dynamic balance" is the correction process of maintaining normal values under the dynamic condition of tires when wheels have abnormal problems or tires are replaced.
What is "four-wheel positioning?
We said that four-wheel alignment is aimed at the installation position of wheels, suspension systems, knuckle mechanic, etc. Because the automobile is a mechanical equipment with extremely high precision requirements, a well-adjusted automobile even needs to be accurate to every screw for the installation position and parameters of various mechanical components.
Similarly, the installation positions of the four wheels, knuckle mechanic, front and rear axles of each car have a fixed installation parameter, which is calibrated by different manufacturers for different vehicles produced by them, the process of restoring this series of mechanical adjustments to the proper state of the vehicle is "four-wheel positioning".
If we still find it difficult to understand, we can imagine that when the heels of the two shoes on our feet are different, we will feel uncomfortable when walking, this is like the wheel of a car "unbalanced";
However, if your feet are hurt or even dislocated, you will feel uncomfortable when walking. However, the root of the problem is not shoes, but the wrong position of the bones of the feet, just like our wheel position is wrong......
Although this metaphor is slightly imprecise, we only need to know that "four-wheel dynamic balance" and "four-wheel positioning" are not the same concepts, although the same appearances may appear, such as vehicle deviation, abnormal tire wear, abnormal steering wheel jitter, etc.; But when the vehicle is abnormal under driving dynamics, when we do vehicle maintenance inspection, A more detailed investigation should be conducted on the chassis and four wheels of the car, and the remedy to the case can cure the abnormal vehicle.
Xiao Bian's personal suggestion is that four-wheel dynamic balance and four-wheel positioning can be done at the same time. After all, from the perspective of these two maintenance work, four-wheel positioning is much more expensive than four-wheel dynamic balance, therefore, I have done it for 1.1 times, avoiding the embarrassment of tearing down the east wall to fill the west wall.
