Locking screws with a washer fixed to it?
Ms. Wan told the reporter that at the beginning of September last year, she bought a Lijie brand electric car for more than 2,400 yuan in a Lijie store located on the electric street of Hongcheng Road in Nanchang.
On May 10 this year, when she was riding on the Yingbin Avenue, she suddenly moved forward and she fell. After getting up, she found that her mouth was full of blood and her teeth were numb. After returning to God, she discovered that her teeth had broken three. The next day, accompanied by her family, she came to the hospital for treatment. The doctor told her that after the swelling, the dentures can be installed at a cost of about 4,500 yuan.
Why did the accident suddenly occur? The Lijie electric car salesman who came to the door later gave the answer - "the front fork is loose." Subsequently, Ms. Wan and others found that the Lijie electric vehicle front fork screws were not equipped with spring washers. They believe that the manufacturer did not install a loose spring washer for the front fork, which made the screw extremely easy to loose.
"The front fork position of this car does not have spring washers installed, and the mat is difficult to see." Li Jie electric vehicle manufacturer related person in charge said that there is no need to install the gasket, the effect is actually no difference. "For 8 months, the car has not been maintained at all." The person in charge said that there is a process of loosening the screws. If the department is in time for maintenance, the accident will not happen.
However, will it be loose when the elastic pad is installed? Let us look at the anti-loose principle of the elastic pad: since the elastic pad is not flat, it is elasticized by extrusion flattening, and an axial force is applied to the connecting body of the nut and the bolt to increase the friction between the threads to prevent loosening. The effect, but in the case of vibration, the bevel of the thread forms a section, and the nut and the bolt move relative to each other, so that the anti-looseness of the spring pad fails.Â
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