Influence of Winter on Freight Car Braking Efficiency


Seeing that it is about to enter November, the minimum temperature in the China northern region has exceeded zero, which also means that the long-standing contradiction in the freight industry is about to break out, that is, the problem between the prohibition of water spraying and braking for trucks.

Trucks are the most economical to spray water, but adding a sprinkler is an illegal modification

When trucks, especially heavy trucks, need continuous braking when driving on long downhill sections, it is easy to cause the temperature of the linings and brake drums of the service brakes to rise sharply. Some data show that the temperature can even be as high as 600~700℃.

At this time, the braking efficiency is reduced, and the most direct, primitive, and low-cost method to cool the braking system is to water.

However, according to Article 16 of the "Road Traffic Safety Law": No unit or individual may assemble a motor vehicle or change the registered structure, structure or characteristics of a motor vehicle without authorization.

Obviously, the installation of a sprinkler is an illegal modification of the original structure of the vehicle. According to relevant regulations, if the shape of the motor vehicle and the relevant registered technical data are changed without authorization, the traffic management department of the public security organ shall order it to restore the original state and impose a fine of 200 yuan. .

It is easy to cause road safety hazards in winter, and the north has begun to investigate and deal with "watering brakes"

A few days ago, the Shanxi Expressway Traffic Police Detachment and Third Detachment launched an operation to investigate and punish "water-drenched brakes". In recent years, every winter, Shanxi Province will issue a reminder that it is forbidden to install sprinklers. With the advent of winter, in addition to Shanxi, the northern regions gradually began to prohibit trucks from being sprayed with water. Why is this contradiction highlighted in winter?

Because after entering the winter, vehicles that have used the water shower will leave a layer of water on the highway road after passing by. When the temperature drops below 0°C at night, the water left on the road will form a layer of dark ice. , once a vehicle drives on the dark ice, a little carelessness will lead to traffic accidents, especially highways, bridges, tunnels and other sections are more prone to road icing, resulting in great safety hazards.

Instead of spraying auxiliary braking, it is necessary to improve active safety awareness

After leaving the shower, how should the truck solve the braking problem?

First of all, the best way to replace the shower is to install auxiliary braking devices such as engine brakes and retarders on the vehicle. Not only the braking effect is good, but also the labor intensity of the driver can be greatly reduced. There are three common types of auxiliary brakes on the market today: exhaust brakes, in-cylinder brakes and hydraulic retarders.

Exhaust braking costs the least, but it also has the worst braking effect. The in-cylinder braking form can be further divided into compression-release braking and air-bleeding braking. At present, for the consideration of braking efficiency and reliability, the compression-release in-cylinder braking form is currently most used in domestic model engines. .

However, due to the price problem, the current popularity of hydraulic retarders is not very high. However, according to the provisions of 5.12 in JT/T1178.2, newly produced towing vehicles should be equipped with retarders or other auxiliary braking devices, which will take effect on September 1, 2020.

Professionals who have been engaged in truck inspections for many years suggest that from the driver's personal point of view, it is more important to increase active safety awareness. When facing a long downhill, avoid using the brakes too frequently. You can use a low gear to maintain the speed of the vehicle, and avoid coasting in neutral. In the event of an emergency, be sure to grab a low gear and make full use of the evasive lane on the side of the road to slow down!

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