On May 29th, Wu Bin, a bus driver in Hangzhou, was seriously injured by a sudden flying metal block on the expressway. Wu Bin reluctantly completed a series of parking actions and stopped the car safely. The 24 passengers on the bus were safe and sound, while Wu Bin died of his injuries. After a preliminary investigation by Wuxi police, it was determined that the metal block was an overused inferior brake wheel hub.
Brake hub is an accessory of braking system of large trucks and trailers. It is about 40 cm in diameter, 2 cm in thickness and weighs 100 kg. It looks like a circle, and it is installed in the wheel rim in the shape of a hood, and the brake pads and bearings are tightly attached inside. The proprietress of the auto repair department of Shida Sophomore Factory pointed to the replaced wheel hub and said that the repair shop receives at least four or five orders to replace the bad wheel hub every day:
Boss: (a car) must change a lot of wheels a year, and every car is easy to break down. No, it often falls. They usually stay there, not all broken.
The heavy brakes of overloaded freight cars are easy to fail.
Why do 100 kg brake wheels often break? Master Cao, who has more than ten years' experience in repairing cars, said that the wheels are all heavy-duty trucks, which are heavily loaded and the brakes are easy to fail, so they are all modified with drippers and the so-called "brake king":
Master Cao: After the overload, they installed a shower gate to cool down. When the temperature is very high, the brake fails and the temperature drops. Cold water will crack when poured. Now the trucks are overloaded and have to run several times before they are replaced.
Master Cao said that after the wheel hub cracks, it is easy to break if it is not replaced in time. Sometimes the wheel hub fragments fall out of the gap on the inside of the tire, and the rear car is not careful. Pressing on the edge of the debris will make the debris fly, which is very dangerous. In the investigation results of Wuxi police, the metal fragments that caused the accident were "over-used inferior brake wheels".
Drivers generally don't take the initiative to change wheels to save money.
Master Cao said that a cheap wheel hub costs three or four hundred yuan, and many drivers generally don't take the initiative to replace the wheel hub in order to save money:
Master Cao: Most drivers want cheap ones. He doesn't buy expensive ones. It has the ultimate thickness, two centimeters thick. It will be replaced when it is ground to a centimeter and a half.
Reporter: What will happen if it is not replaced?
Master Cao: It's broken. Come to our place to repair it. He won't change it unless it's bad. Wheels are genuine and semi-finished products. The thickness is different. The original one is thicker. The thickness of the support is not as thick as this, and it will not work for several months.
In order to save money, for convenience, the truck with broken hub was still driving on the road, but Wu Bin's life was lost. I hope that drivers and friends can pay attention to timely inspection and replacement of automobile wheels, and also hope that relevant departments can improve relevant laws and regulations, standardize the auto parts market, and prevent such tragedies from happening again.