In the past month, all walks of life have pursued and remembered our “most beautiful driver†Wu Bin in various ways. As a bus driver, he burst into breathtaking moral light at the critical moment of his life, making everyone respect and respect. At the same time, he also regrets that because he is young. After painstakingly studying the causes, we can not help but sigh. If security is prevented, the tragedy will not be staged.
Drum brake, the culprit
According to a Wuxi police investigation, in the “May 29†accident, the “fatal iron piece†that caused Wu Bin, who was “the most beautiful driver†to die, came from a brand truck. The truck had replaced a damaged brake hub on June 1 for two possible reasons: the brake parts were not properly riveted, or the brake parts did not pass quality. We do not discuss what kind of reasons it is because the drum brake itself has congenital safety flaws and it is one of the main reasons for the frequent occurrence of truck accidents in our country.
From the point of view of the initial structural design, the temperature of the closed drum brake may exceed 400 degrees during continuous braking; the reason for the design structure is that the friction surface of the brake shoe and brake drum in the relatively “closed environment†is very If it is difficult to dissipate heat, not only will the brake effect fade, but it will even cause brake failure. If the water source such as water on the road is splashed by the tire to the brake drum in a high temperature state, it is very easy to cause the brake cymbal to break, and in severe cases, the ruptured brake drum debris is thrown directly.
Is there no other brake to replace the drum brake?
Disc brakes, or will become the national standard
In developed countries such as Europe and America, trucks, especially light trucks, have already withdrawn from the market. In China, because there are no mandatory national standards, and limited by the R&D and cost of the company, only a few high-end trucks use disc brakes with high safety. All of them are designed for front and rear drums, and many trucks are Four-wheel drum brakes.
Disc brake structure
Compared with the drum brake, the disc brake has good heat dissipation performance. When the disc brake is continuously braked, the maximum temperature is 200 degrees lower than that of the friction brake of the drum brake. Because the friction surfaces of the brake shoe and the brake disc are directly in contact with the air flow, the heat generated during the friction can be Direct ventilation and heat dissipation ensure the stability and reliability of the truck during long-distance braking. In addition, in the disc brake system, the “caliper†structure of the brake shoe and the brake disc determines that the brake disc and the brake shoe cannot be broken into pieces to be thrown under any circumstances. Obviously, the safety risk of using disc brakes for trucks will be greatly reduced.
It is worth mentioning that at the end of May, in order to improve the safety of trucks operating in the city, the local standards interpretation center for the operation of trucks in the urban center of Beijing Municipality has formulated local standards for Beijing, and it will be mandatory to use the disc system for the front axle of commercial trucks. move. To a certain extent, Beijing local standards indicate the future development trend of trucks in China.
In response to truck safety trends, four-wheel disc brake light trucks come out
In order to comply with the truck's security development trend, Chery's first high-end light truck, the Karei Green Card, which was powered by four-wheel disc brakes, officially went offline and was approved by Beijing's local standards.
According to reports, the Kerry Green Card has made new breakthroughs in the safety of light trucks. For the first time, a four-wheel disc brake system has been innovated. In addition, four-channel ABS and EBD have been configured to prevent the vehicle from slipping and prevent wheel clacking during emergency braking. Dead, greatly improving the security. In addition, in order to improve the safety of the vehicle, the development of the Garrett Green Card was optimized based on the reasons for the frequent occurrence of truck accidents in the binocular obstacle angles of the headlights, rearview mirrors and A-pillars.
For example, in China, truck drivers mostly choose to get out at night. The integrated crystal headlights of the Kerry Green Card not only provide an elegant and elegant atmosphere, but also equipped with an independent high beam and a lenticular type of low beam, providing sufficient illumination to protect the driver's night driving safety. The Karry Green Card strives to reduce as many vehicle safety hazards as possible in truck hardware configurations and provide more safety and security for drivers and passengers.
The "most beautiful driver" incident gave us a bloody lesson. It is imperative to promote the upgrading of truck safety configurations in China as soon as possible.
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