Students who have changed tires or supplemented tires know that every time the car tires are disassembled, they need to do a new balancing. But do you know what role does dynamic balance play? If you don't do balancing, how big is the impact on a car? Today, Xiao Bian focuses on the balance of the wheel, talk about the seemingly inconspicuous parts of the car, how much impact on the driving of the car.
????Why do you want to balance?
????Many people may ask, the wheel is round, why is there a beating? In fact, although the rim is circular, in high-speed operation, due to the large centrifugal force, if there is an imbalance in the overall weight of the rim, there will be a phenomenon of skipping and shaking, especially like a valve, which will greatly affect The dynamic balance of the tire. In addition, as long as the tire is removed from the rim, whether it is a tire change or a tire repair, the dynamic balance on the rim will be invalid, and the balance must be redone.
????Before the wheel is not balanced, the tire can't maintain a balanced force when it runs. The wheel will have a frequency jump. The faster the speed, the more the jump will be. In addition, the steering wheel will also be shaken. In serious cases, the car will also be shaken. A sense of resonance occurs. In addition to the vehicle personnel will feel the beating, the wheel imbalance will also cause certain damage to the vehicle itself. Driving in such an environment for a long time will cause the tire to be eccentric. If the wheel imbalance is severe, long-term driving in this state will cause serious damage to the bearings and suspension, thus shortening the life of the mechanical structure.
????Some students often confuse the concept of vehicle dynamic balance and four-wheel alignment. Here, Xiaobian also emphasizes once again. The dynamic balance is specially adjusted for the wheels, and the four-wheel alignment is for the vehicle suspension parameters. Adjusted, these two points must be distinguished.
????Vehicle balance block classification
????Weight material classification
????At present, the material of the dynamic balance block on the market is mainly iron blocks, and the single weight is generally 5g, 10g and 20g. Previously, the weights used in the early market were mostly lead and zinc blocks. However, due to the high cost of these two materials, in the latter stage, the dynamic balance blocks were all replaced with lower cost iron blocks.
????Most of the weights on the market are now designed with an internal sticker. The balance block is fixed with 3M glue and is more convenient to install. At the same time, since the weight is mounted on the inside of the hub, it is also visually more aesthetically pleasing.
????External weight
????This kind of weight is an early design. The reason why the external design is mainly related to the rim shape at that time, so the external weight will be installed on the edge of the wheel eyebrow, so it is slightly convex. The design does not look good, but because of the proper fixing method, this configuration block is generally not easy to fall off after being fixed. Nowadays, on some large trucks, this weight is still used.
????Wheel balancing procedure
????At the beginning of the article, we have already mentioned that when the tire is disassembled, it needs to be rebalanced. Before doing dynamic balancing, it is first necessary to remove all the original weights of the rim, and then use the professional dynamic balancing machine to measure the wheel weight distribution, and stick the corresponding weights to the uneven distribution position. The detailed operation is as follows:
????Step 1: After installing the tires, first use a flat-blade screwdriver to smash the balance weight on the rim. If the external balance weight requires professional tools, you can remove it. After the balance block is removed, you can enter the test before the dynamic balance.
????Step 2: When testing the rim dynamic balance, first measure the rim size with a professional tool, then input the relevant data into the device, fix the rim, and enter the final preparation stage before the test.
????Step 3: Turn on the device, turn the wheel by the dynamic balancing machine, and automatically stop the rotation after measuring the uneven weight distribution. At the same time, the weight of the balance block to be added on the rim will also be displayed on the meter.
????Step 4: After measuring the value of the rim, you can install the balance block. According to the installation position prompt on the dynamic balancing machine (generally just above), accurately install the balance weight of the corresponding weight on the inner side of the hub. .
????Step 5: Finally, we restart the equipment again. When the rim rotates, the reading on the meter shows “0”, which means that the rim has reached perfect balance and can be loaded.
????At present, most cities in China do dynamic balancing. The cost per rim is between 30-100 yuan, which causes the price difference to be mainly related to the economic level of each city. Of course, different construction sites, there will be some differences in fees, generally the highest price of 4S shop. It is a relatively simple matter to balance the rims. Most of the fast-repair shops have no problem at all, and the price is relatively more affordable. However, it is worth noting that if the tire imbalance is too large at a certain position, it is necessary to install a lot of balance blocks. It is recommended that the staff directly remove the tires and reassemble them before performing dynamic balance measurement.
????to sum up:
????The balance is actually very simple, and the price is generally cheaper. But it is such an inconspicuous thing that plays a vital role in the stability of the vehicle. If there is a problem with the dynamic balance of a car, there will be a series of problems such as skipping, shaking, and even body resonance. Therefore, whether it is repairing a tire or replacing a new one, it is very important to remember to balance the rim after installing the tire.
