05
2025
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06
Why can't you always stand! A little bit about heavy truck brakes
The card friend circle saw a video of a car accident, a heavy truck loaded with mud was suspected to have crashed on a dense road section due to brake failure. From the video, it can be seen that about dozens of cars have been damaged to varying degrees, and the casualties are unknown, and the video has been widely spread on WeChat, which has invisibly increased people's bad impression of the truck.
The author learned from follow-up news reports that the accident occurred on Jiaowang Road, Qingzhou City, Shandong Province, and the vehicle that caused the accident was indeed a brake failure, and the accident caused 13 vehicles to be damaged and 20 people injured, and the accident is being handled.
Most of the people who watched this video said that their scalps were numb, and they gasped and sighed.
Is the braking performance of a stumped truck really that bad?
Here we might as well briefly understand the basic braking principle of the truck, here we do not talk about the braking system of the rare air top liquid mode, only say that we commonly use the hub air brake, the basic principle is to store the gas produced by the air compressor in two cylinders, one of which is connected to the master cylinder, when the driver steps on the brake pedal to make the brake master cylinder work, push the relay valve to work, and the other air reservoir pushes out the ejector rod of the brake cylinder, and rotates the cam through the adjusting arm. The irregular cam pushes the brake shoe to the top and rubs against the hub, so as to achieve the effect of braking.
This braking principle is actually much better than that of ordinary cars, but once our trucks are loaded with goods, the effect is not so ideal.
It is necessary to know that the driving truck on the road, due to gravitational acceleration, brake heating and other reasons, often requires a longer braking distance than ordinary vehicles, and experienced drivers are braking in advance to prevent accidents in advance.
The author understands that many vehicle operators, in order to have a better braking effect in the case of heavy load, after buying a new car, they will go to the auto repair shop to modify the brake cylinder, master cylinder and brake grain, due to the friction between the shoe and the wheel hub will produce high temperature, the owner will install a water system for cooling.
In order to reduce traffic accidents caused by brake failure, manufacturers have also made great efforts in the braking system.
For example, the engine is equipped with an exhaust brake that closes the exhaust duct to reduce the engine torque, and the oil pressure or solenoid valve is used to push the rocker arm to open the valve, so that the engine can brake in the cylinder for useless work.
For example, China National Heavy Duty Truck has cooperated with MAN in Germany to produce disc brakes, which dissipate heat faster than hub brakes, lighter in weight, shorten the braking distance, and improve the overall safety performance.
There are also some trucks installed with hydraulic retarder and electromagnetic retarder at the front end of the drive shaft, all in order to avoid brake failure and have a better braking effect.
There are also some trucks installed with hydraulic retarder and electromagnetic retarder at the front end of the drive shaft, all in order to avoid brake failure and have a better braking effect.
Although the rectification action has effectively controlled the overloaded and overrun vehicles, then again, if the trucks are not overloaded, they will earn less, and everyone knows it. Moreover, many truck businesses with standard ton transportation have also been affected to varying degrees.
No one wants accidents, but we try to avoid accidents and reduce accidents. Although money and material have an irreplaceable position in the market economy, what is the use of having more money without security?
I hope that cardholders will always keep in mind the safety of driving, for themselves, for others, and for everyone.
Focus on the research and development of automotive brake systems and pneumatic brake valves to promote the development of the auto parts industry!
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