Recently, Wu Bin, a driver of the Hangzhou Changyun Group, drove a long-distance bus on the Huyi Expressway and was hit by a metal block that flew in the opposite lane. After investigation, it was confirmed that the deadly metal block was the brake hub on the rear trailer of the tractor. This has caused widespread public concern. After a wave of waves, it started again. Subsequently, similar accidents took place in the Hangzhou-Xinjing Expressway and Hangzhou-Jinhuan Expressway, and many people were injured.
The vehicles on foreign bodies that have repeatedly flew over foreign bodies on the highway have caused casualties. This can not help but make the public wonder why the brake hub fragments will fly out. How can we avoid the recurrence of such incidents?
Freight drivers: Lack of regular maintenance and overloading is mainly due to the reporter's asking “the most beautiful driver Wu Bin case†when the freight driver Master Wang sighed. “Although the accident was an accident, it gave the freight driver a wake-up call,†said Master Wang. “When I was in the car, I routinely checked the condition of the vehicle, but I never seriously checked the small links. This major traffic accident The occurrence reminded me that driving is not only responsible for myself but also responsible to others.â€
Master Wang stated that the tractor usually runs 20,000 kilometers to maintain it. However, the private bosses generally have a tendency to pass over them. They often neglect regular maintenance. In addition, vehicle overload causes brake hubs to wear excessively, resulting in cracking and falling off. . “Because of the busy business, truck drivers often travel around to transport goods so that vehicles cannot be regularly maintained.†Master Wang told reporters that the main problem is that the freight company does not have a clear regulatory system.
"As far as I know, Hong Kong's freight companies have done a better job. Under normal circumstances, trucks coming from Hong Kong are in very good condition because they have special supervision, require regular maintenance, and do not allow overloading. It will be checked from time to time and drivers who fail to comply will be severely punished,†said Master Wang.
Master Qi believes that overload is the main cause of accidents. “Now the trucks are overloaded, and the tractors that typically carry around 50 tons are often loaded with more than 100 tons of cargo. The most common are trucks that transport sand and gravel materials from Tianjin to Beijing, which are generally more than twice as heavy. Such vehicles are on highways. Slow driving, occasionally half-way anchoring and falling parts, etc.†Master Qi said that when the truck is overloaded, the tires will be under great pressure, and the force generated during the emergency braking will exceed the capacity of the vehicle itself and the brake hub will come off. .
"A lot of cargo drivers do not normally replace the brakes to save money. Instead, they go to the repair shop and rebuild the old brake linings." Master Qi told reporters: "The price of a general brake hub is 400 to 500 yuan. There is no need for such a high price. There are many truck drivers around me that use refurbished brakes."
“This accident has given me a great deal of touch and raised the worries of freight drivers. We must start from ourselves by putting an end to overloading, so we can rest assured.†Master Qi said.
Experts: Drum brakes have hidden safety problems Wang Baojun, engineer of the Technical Development Department of FAW Liberation Co., Ltd., said that the wheels were not detached. “In general, whether it is the brake pad or the hub, the probability of falling off at high speed is very small. Because the brake block is riveted to the brake, if there is friction during the braking process, the taste is very big, and the driver cannot know it.†Wang Baojun said.
“It is undeniable that truck drivers do have a long brake time and are prone to heat during high-speed running.†Wang Baojun told reporters that because the brakes take a long time, the brakes generate a lot of heat, causing the brakes to malfunction. Truck drivers can only rely on watering to lower the brake's temperature, which can easily crack the brake hub.
"The frequent use of brakes or self-adjusting brake air pressure under overloaded conditions can also cause cracking of the brake drum. Therefore, drum brakes have a relatively large safety risk," Wang Baojun introduced.
In response, Zhang Shulin, director of the China Automotive Technology Center, believes that the hub brakes will burst due to excessive wear and aging and other factors that may cause safety hazards. “The bumpy road surface of the truck will cause a relatively large impact on the brake hub, and the excessive wear and aging of the parts will increase the probability of damage to the brake hub. In addition, many brake rigs used on trailers lack strict quality control, plus trucks. Heavy overloading makes the brake hub a potential accidental threat.â€
How to eliminate security risks? Zhang Shulin believes that the use of disc brakes is the best choice. "From a technological point of view, the use of disc brakes for heavy trucks will be a trend. First, the disc brakes press the material together with the steel plate under high temperature and hot pressure conditions, and it is not easy to fall off. In addition, its thermal stability can be prominent and wading. With strong recovery and high-speed braking, it is superior to the drum brake in brake effect. The disc brake has long service life and low maintenance cost, and has been gradually recognized by the market."
"Because disc brakes have advantages, the industry encourages them to replace drum brakes. Last year, the state has issued regulations requiring that the front wheels of dangerous goods vehicles should be equipped with disc brakes. In order to drive safely, other transport vehicles must gradually reach This standard." Zhang Shulin said.
According to report, some countries in Europe and America have already issued mandatory policies to require commercial vehicles to install disc brakes.
High price maintenance hinders disk brakes from a safe point of view. The use of disc brakes for heavy trucks has gained consensus in the industry. Many vehicle companies are also promoting it. However, in domestic commercial vehicles, especially heavy trucks, there are few batch assembly disks. Brake sound. Heavy truck industry to promote disc brakes where?
An industry source told reporters that most domestic heavy trucks now use drum brakes. Although the braking effect of the disc brake system is relatively good, domestic technology is not yet mature and will increase costs.
“There are also many parts manufacturers in China that are developing and manufacturing disc brakes, but they started late. Most of the heavy duty truck repair stations are equipped with drum brake parts, and there are almost no spare parts for disc brakes. Moreover, the production technology of disc brakes is complicated. , The price is higher, if you replace the disc brakes, you need to increase the cost of 3,000 to 4,000 yuan, so long-distance transport users will not take the initiative to use disc brakes." Industry sources said.
This was confirmed by the driver of the truck driver Xie Shifu: "Truck drivers all know that the performance of disc brakes is good, but the price is an important reference standard. Disc brakes are several thousand dollars more expensive than drum brakes, and we cannot afford them. Few spare parts for disc brakes are available in the maintenance stations that run long distances. Once faults occur, where to repair is also a problem."
In addition, overloaded transport is also limiting the promotion of disc brakes. “Disc brakes are very demanding on the use of the environment. If the maintenance is not timely or the environment is not up to standard, it is easily damaged. In the case of overload, the brakes require a large braking force, wear on the disc brake pads is very large, if serious overload It may even cause disc brakes to break.†Industry insiders told reporters that in order to achieve universal disc brakes in China, it is necessary to increase the intensity of overriding and to increase the awareness of drivers to regularly maintain vehicles.
The vehicles on foreign bodies that have repeatedly flew over foreign bodies on the highway have caused casualties. This can not help but make the public wonder why the brake hub fragments will fly out. How can we avoid the recurrence of such incidents?
Freight drivers: Lack of regular maintenance and overloading is mainly due to the reporter's asking “the most beautiful driver Wu Bin case†when the freight driver Master Wang sighed. “Although the accident was an accident, it gave the freight driver a wake-up call,†said Master Wang. “When I was in the car, I routinely checked the condition of the vehicle, but I never seriously checked the small links. This major traffic accident The occurrence reminded me that driving is not only responsible for myself but also responsible to others.â€
Master Wang stated that the tractor usually runs 20,000 kilometers to maintain it. However, the private bosses generally have a tendency to pass over them. They often neglect regular maintenance. In addition, vehicle overload causes brake hubs to wear excessively, resulting in cracking and falling off. . “Because of the busy business, truck drivers often travel around to transport goods so that vehicles cannot be regularly maintained.†Master Wang told reporters that the main problem is that the freight company does not have a clear regulatory system.
"As far as I know, Hong Kong's freight companies have done a better job. Under normal circumstances, trucks coming from Hong Kong are in very good condition because they have special supervision, require regular maintenance, and do not allow overloading. It will be checked from time to time and drivers who fail to comply will be severely punished,†said Master Wang.
Master Qi believes that overload is the main cause of accidents. “Now the trucks are overloaded, and the tractors that typically carry around 50 tons are often loaded with more than 100 tons of cargo. The most common are trucks that transport sand and gravel materials from Tianjin to Beijing, which are generally more than twice as heavy. Such vehicles are on highways. Slow driving, occasionally half-way anchoring and falling parts, etc.†Master Qi said that when the truck is overloaded, the tires will be under great pressure, and the force generated during the emergency braking will exceed the capacity of the vehicle itself and the brake hub will come off. .
"A lot of cargo drivers do not normally replace the brakes to save money. Instead, they go to the repair shop and rebuild the old brake linings." Master Qi told reporters: "The price of a general brake hub is 400 to 500 yuan. There is no need for such a high price. There are many truck drivers around me that use refurbished brakes."
“This accident has given me a great deal of touch and raised the worries of freight drivers. We must start from ourselves by putting an end to overloading, so we can rest assured.†Master Qi said.
Experts: Drum brakes have hidden safety problems Wang Baojun, engineer of the Technical Development Department of FAW Liberation Co., Ltd., said that the wheels were not detached. “In general, whether it is the brake pad or the hub, the probability of falling off at high speed is very small. Because the brake block is riveted to the brake, if there is friction during the braking process, the taste is very big, and the driver cannot know it.†Wang Baojun said.
“It is undeniable that truck drivers do have a long brake time and are prone to heat during high-speed running.†Wang Baojun told reporters that because the brakes take a long time, the brakes generate a lot of heat, causing the brakes to malfunction. Truck drivers can only rely on watering to lower the brake's temperature, which can easily crack the brake hub.
"The frequent use of brakes or self-adjusting brake air pressure under overloaded conditions can also cause cracking of the brake drum. Therefore, drum brakes have a relatively large safety risk," Wang Baojun introduced.
In response, Zhang Shulin, director of the China Automotive Technology Center, believes that the hub brakes will burst due to excessive wear and aging and other factors that may cause safety hazards. “The bumpy road surface of the truck will cause a relatively large impact on the brake hub, and the excessive wear and aging of the parts will increase the probability of damage to the brake hub. In addition, many brake rigs used on trailers lack strict quality control, plus trucks. Heavy overloading makes the brake hub a potential accidental threat.â€
How to eliminate security risks? Zhang Shulin believes that the use of disc brakes is the best choice. "From a technological point of view, the use of disc brakes for heavy trucks will be a trend. First, the disc brakes press the material together with the steel plate under high temperature and hot pressure conditions, and it is not easy to fall off. In addition, its thermal stability can be prominent and wading. With strong recovery and high-speed braking, it is superior to the drum brake in brake effect. The disc brake has long service life and low maintenance cost, and has been gradually recognized by the market."
"Because disc brakes have advantages, the industry encourages them to replace drum brakes. Last year, the state has issued regulations requiring that the front wheels of dangerous goods vehicles should be equipped with disc brakes. In order to drive safely, other transport vehicles must gradually reach This standard." Zhang Shulin said.
According to report, some countries in Europe and America have already issued mandatory policies to require commercial vehicles to install disc brakes.
High price maintenance hinders disk brakes from a safe point of view. The use of disc brakes for heavy trucks has gained consensus in the industry. Many vehicle companies are also promoting it. However, in domestic commercial vehicles, especially heavy trucks, there are few batch assembly disks. Brake sound. Heavy truck industry to promote disc brakes where?
An industry source told reporters that most domestic heavy trucks now use drum brakes. Although the braking effect of the disc brake system is relatively good, domestic technology is not yet mature and will increase costs.
“There are also many parts manufacturers in China that are developing and manufacturing disc brakes, but they started late. Most of the heavy duty truck repair stations are equipped with drum brake parts, and there are almost no spare parts for disc brakes. Moreover, the production technology of disc brakes is complicated. , The price is higher, if you replace the disc brakes, you need to increase the cost of 3,000 to 4,000 yuan, so long-distance transport users will not take the initiative to use disc brakes." Industry sources said.
This was confirmed by the driver of the truck driver Xie Shifu: "Truck drivers all know that the performance of disc brakes is good, but the price is an important reference standard. Disc brakes are several thousand dollars more expensive than drum brakes, and we cannot afford them. Few spare parts for disc brakes are available in the maintenance stations that run long distances. Once faults occur, where to repair is also a problem."
In addition, overloaded transport is also limiting the promotion of disc brakes. “Disc brakes are very demanding on the use of the environment. If the maintenance is not timely or the environment is not up to standard, it is easily damaged. In the case of overload, the brakes require a large braking force, wear on the disc brake pads is very large, if serious overload It may even cause disc brakes to break.†Industry insiders told reporters that in order to achieve universal disc brakes in China, it is necessary to increase the intensity of overriding and to increase the awareness of drivers to regularly maintain vehicles.
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