Hello everyone, this is a column focusing on car repair and maintenance. There are car secrets you don't know here, and it will teach you how to avoid big pits on the road to car maintenance. I believe that not only you, but also many people have a certain hazy feeling about the automotive aftermarket. Here will help you uncover the unknown stories of car repair and maintenance.
When this car is running at a high speed, once the speed reaches 120Km/h, the wheels will shake violently, and this shake will be transmitted to the steering wheel. I even have the feeling that I can't hold the steering wheel, but as the speed rises, this shake will disappear. After testing, it is found that there is a problem with dynamic balance.
This interior really brings me back to the feeling of the last century.
Explorer's super large rims and tires, the data is 255/50R20, and the tire manufacturer is Hankook Wantus series. The original chrome rim is my favorite style, but as time goes by, it now looks a little blurred and its reflection is not as good as before.
After the tire is installed in the dynamic balancing machine, the distance from the rim to the chassis is first measured.
Then measure the width of the rim. Finally, input the diameter of the rim into the dynamic balancing machine based on the tire data.
Because the explanation is more troublesome and not very intuitive, it is easier to understand. The distance measured in the first step is 46mm, and the value measured in the second step is b? value, and the third value is the diameter of the rim. It can be found by reading the data engraved on the tire, which is 20.
After the measurement is completed, the dynamic balance test is started. The bench will give the wheel a driving force to allow the wheel to rotate at a certain speed. The balance value of driving the wheels of a simulated vehicle while driving on the road? This value will be displayed on the screen, and the counterweight is used for dynamic balance by adding a balance weight.
According to the data given by the dynamic balancing machine, there is actually a weight difference of 70 grams on the outside of the rim.
The counterweight has a location area, and the dynamic balancing machine will give a specific location. It can be settled by weighing the weight according to the specific requirements of the location.
Dynamic balance cannot be done completely at once. These four data after the first time. It can be seen that the difference in weights on the left and right sides has obviously become smaller, and a second dynamic balance is needed.
The second perfect zeroing.
Remove the wheel and test the other wheel. When installing, pay attention to the fact that the locking device of the wheel must be in place. The wheel rotating at high speed may fly out and hurt people. The wheel must also be placed flat on the locking device, otherwise the uneven rim is a mistake in itself. If you do dynamic balancing, you will probably not be able to balance it.
I used adhesive weights to weigh weights, which is also the mainstream method of weighing weights nowadays. There is also a counterweight with a bayonet pin to be stuck on the edge of the rim.
This wheel is only 10 grams short of weight. You can imagine that the rim just now must have been damaged.
All four tires were finished and it took a whole hour. It was best to install the tires. Tire bolts have strict torque requirements, so I chose a torque wrench for pre-tightening.
After conducting the road test, there was no feeling of vibration at all.