The Wu Bin incident on May 29, 2012 has aroused widespread concern. For Master Wu Bin, besides admiration, it should also arouse our thinking: How did the tragedy happen and how should this tragedy be avoided? After investigation, it was found that the “eccentric matter†that caused Wu Bin, the “most beautiful driverâ€, to die, came from the brake hub of a large truck. It was the fragments of the truck’s brake hub that flew out and hit Wu Bin’s master and caused tragedy. The brake drum is a part of the drum brake system. When the brakes are applied, the piston applies pressure to the two pairs of half-moon brake shoes so that they are in close contact with the inner wall of the drum and friction is generated to stop the rotation of the wheels. The material of the brake hub is generally HT200-300 (ie, gray cast iron). The matrix is ​​mainly composed of pearlite and a small amount of ferrite and cementite. The graphite is mainly grade A, and the shape is a long piece. The length grade is 4 -6 level, play a role in heat dissipation, increase friction performance, reduce brake noise. However, when trucks are braked on long downhill slopes or at high speeds, the hubs are easily heat-treated at high temperatures, resulting in brittle hubs and loss of performance. This is extremely dangerous. This is coupled with the fact that the driver’s inspections are not updated in time, similar to the tragedy of Master Wu Bin. It's inevitable. In addition to constantly checking for updates, are there other ways to avoid tragedies? The answer is yes! The installation of a retarder on the truck will achieve the most effective on balanced braking and reduce wear on brake pads and tires. In the new standard of the “Regulations for the Operational Safety of Motor Vehicles†(GB7258), it is clearly stated that more than 12 tons of trucks and dangerous goods carriers will be forced to install retarders or other auxiliary braking devices. After the regulations were put forward, the most discussed issue was the installation of the retarder. In fact, the use of retarders on trucks is not yet widespread, and truck users are still in the acceptance and recognition stage. Teller Retarder The installation of retarder not only can alleviate the hub damage caused by overheating of the brakes, but can also relieve the effects in other aspects. The “water tank†treatment method used today has also had an adverse effect. On the one hand, the weight of the water tank is nearly 500 kg, which adds an additional amount of vehicle quality. This is extremely inappropriate for light weight trucks, and on the other hand, water is dropped on the ground. After the road is easily damaged, especially in the winter, it is also easy to ice, affecting vehicles on the road. In response, Wang Xiaobin, the person in charge of the first brand of global retarder Tai Lema, said that when encountering a downhill road, the Velodrome's eddy current retarder brake response is very fast, requiring only 0.02 seconds. For the output speed point, the maximum torque is 30km/h, and the effective speed is 10km/h. As long as the vehicle speed reaches 10km/h, the retarder can exert more than 85% braking effect. Therefore, in the long downhill road, Tellomar retarder can quickly produce braking effect, reduce the braking distance and shorten the braking time. It can eliminate the accidental tire blowout caused by high hub temperature and avoid the main brake to decline or fail. This also avoids the temperature overheating due to continuous braking during downhill slopes. It is understood that Tellomar retarder can not only eliminate the accident caused by brake overheating, but also save the cost of replacing brake pads. After one year's monitoring data, Talemar found that the vehicle saves 1,600 yuan/year on brake pads and wheels, and the tires save 10,000 yuan/year. Therefore, in order to avoid the recurrence of the Wu Bin incident and improve the safety of commercial vehicles, the installation of retarders on trucks will be a trend in the future.
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