In wheel maintenance, in order to prevent the bolts and nuts from rusting on the wheels, a few private car owners ingeniously coat the bolts and nuts with lubricating oil during installation. They do not realize that this approach is not only wrong, but also brings certain hidden dangers to driving safety.

After the bolts and nuts are tightened, they have self-locking characteristics. After applying lubricating oil, the self-locking coefficient between the two becomes smaller and the self-locking performance decreases. When the car is driving at high speed, the bolts and nuts are easy to loosen or even fall off, which can cause driving accidents.

There are always some minor problems in the car in life, and car repair is a technical job. There are many points to pay attention to during the repair process, but some car owners like to deal with problems by themselves first, but because they are not professional The maintenance personnel in the repair process will often use some wrong repair methods to deal with their cars, which often leads to their own car injuries.

Do not oil the tire bolts and nuts

Owner Ms. He: I feel that the bolts and nuts on the wheels are easy to rust. Can you lubricate them so that they don’t rust?

Re: Similar to Ms. He’s concerns, many car owners will have. In order to easily tighten the nuts and prevent corrosion, oil the bolts and nuts of the tire. In fact, this is a wrong approach. Because, according to the knowledge of mechanical principles, after the tire nut is tightened, the thread has a self-locking feature. This is because the thread helix angle is smaller than the equivalent friction angle between threads. In a given bolt connection, the helix angle is a certain value, and the equivalent friction angle changes with the friction state between the threads. Obviously, the equivalent friction angle between the threads is reduced after oiling, and the self-locking performance of the bolt connection becomes worse. Therefore, do not apply grease or soak lubricating oil on the bolts and nuts of the tire. Doing so will loosen the nuts and run off the tires, causing serious accidents.