The trailer is forced to install disc brakes, and liquid buffer will replace water shower as standard. Will you refute it?

The national standard GB7258 was officially implemented on 20 18+ 10/month/day. According to the standard requirements, from 20 19+ 10/0/day, the semi-trailer transporting dangerous goods must be equipped with disc brakes; On June 2020, 65438+1 October1,three-axle storage and rail-type semi-trailers must be equipped with disc brakes.

For card friends, the cost of buying a car and maintaining it will definitely increase in the future; For trailer factories, manufacturers who are prepared in advance will start a new round of market division, while those who are not prepared can only be forced to start technical upgrading.

But in my brother's opinion, this may be the beginning of standard hydraulic retarder.

○? Installation of retarder is encouraged in GB7258.

Why do you think so?

As we all know, the disc brake has higher braking efficiency and lighter weight than the drum brake, but it will produce the same thermal attenuation phenomenon as the drum brake on the long downhill section, which means we can't stop; At this time, if the drum brake is sprayed with water to cool down, it will directly cause the brake disc of the disc brake to crack due to thermal expansion and cold contraction, which will lead to serious accidents.

In order to avoid this phenomenon, some people put forward a solution of installing a hydraulic retarder on the main car and a disc brake on the trailer, which undoubtedly stimulated the growth of the hydraulic retarder market to some extent.

Take Voith as an example. In 20 18, the company's annual sales in China was close to 20,000 vehicles, but in 20 19, this figure reached 35,000 vehicles, a full increase of 75%.

○? Tuvoit hydraulic reducer

Even in the case of such an obvious increase in sales, as an accessory of commercial vehicles, the hydraulic retarder presents such a polarized comment that "it is too expensive to use, and the used one can't be separated", and even some extreme card friends regard the hydraulic retarder as another gap for OEMs to make money.

Is that really the case?

Where does the resistance come from?

The reasons given by the card friends who are "inseparable from the hydraulic retarder" are mostly similar. They believe that using hydraulic retarder instead of water shower will make it easier to get out of the car at ordinary times and increase some income to some extent.

Although there are various reasons for resistance, most of them are inseparable from the following.

The first reason is the price of hydraulic retarder. The average price1.5,000-30,000/set is no less than cutting off a piece of meat for card friends with unstable income; At the same time, the transportation pressure is getting bigger and bigger, and the money earned is getting less and less. On the premise of maintaining the normal operation of vehicles, most truck drivers spend tens of thousands of dollars to install hydraulic retarder, which is rejected from the bottom of their hearts.

The second is stupidity. The reason for this group's resistance mainly comes from their ignorance of hydraulic retarder and related safety knowledge, so they are easily influenced by the thoughts of people around them.

As everyone knows, the person who urged them not to install the hydraulic retarder, in addition to being a loyal user of the sprinkler, may also be a person who even fooled others into standing in the same camp with him, driving a car without engine braking.

We don't deny the contribution of sprinklers to driver safety in the past, but please look directly at the hidden dangers behind this safety. While technology is developing, everyone's thoughts should not stagnate.

Finally, it is because of driving habits. This part of the card friends don't have so much resistance to the hydraulic retarder. They don't pretend because they really can't use it. According to the working conditions, they can avoid the risk caused by braking problems as long as they reasonably use the engine braking brought by the manufacturer, that is, the downshift braking that old card friends often say, supplemented by the driving awareness of defensive driving.

In fact, it is not difficult to find that there are various reasons for refusing to install the hydraulic retarder, but all roads lead to the same goal because there is no real contact with or understanding of the hydraulic retarder. Even if the hydraulic retarder is driven once, this one-sided conflict situation will not occur.

So, should everyone install a hydraulic retarder?

Should the hydraulic retarder be installed?

Before answering this question, I hope you can listen to me about the advantages of hydraulic retarder before making a decision.

Lighter self-esteem and more economical.

The lighter weight mentioned here is the result of comparison with sprinklers. In general, after the sprinkler is filled with water, the tank and the whole pipeline device add up to almost 500- 1000 kg, while the hydraulic retarder is generally only 50-80 kg. According to the requirements of GB 1589, isn't this an extra load of 900 Jin?

In addition, the performance of hydraulic retarder in operating cost is unmatched by water shower.

○? Figure Price List of National Highway Water Filling Station

Take Yunnan as an example, 1 year needs to replenish water for at least 200 days. According to the calculation of 1 day plus 2 times, 1 times plus 15 yuan, it will cost 6,000 yuan per year just by adding water. On the other hand, the hydraulic retarder only needs the initial purchase fee and the maintenance fee every 60,000 kilometers. If the attendance rate is high, the cost can be recovered in two years.

In the long run, after using the hydraulic retarder, the wear of tires and brake pads will be reduced, and the maintenance cost can also be saved. If the cost is offset, the sprinkler has no advantage at all.

No need to stop to add water, saving time.

In the truck industry, "time is money" has never been a slogan. Originally, the owner wanted to deduct your freight, but he was more reasonable when you were late.

○? What a good truck waiting for the water to cool.

There is no doubt that the sprinkler needs to stop to add water, and the water adding points on the national highway are familiar. When there are many people, you can only wait in line, and you need to strictly control the speed and water flow speed during driving, otherwise the water will have run out before you finish the ramp.

On the contrary, the time advantage of hydraulic retarder is also obvious. There is no need to stop and add water in advance. When encountering a long slope, you can directly open the corresponding gear, go downhill at a constant speed, and then close the hydraulic retarder after crossing the slope.

○? Control lever of hydraulic retarder on Scania car.

After understanding, my brother came to answer the question just now-is it necessary to install a hydraulic retarder?

In this regard, my opinion depends on the situation: first, look at your own type of transportation; Secondly, look at your own operating costs.

Usually driving in plain or hilly areas, card friends engaged in short-distance transportation can choose standard engine braking, and rationally use the speed difference between different gears to achieve the purpose of deceleration.

If you are a roaming player who goes to Ruili, Yunnan for two days to pull watermelons, and then goes to Guangxi for two days to pull sugar cane and run national logistics, my brother still suggests that you install a hydraulic retarder once and for all.

In addition, you need card friends who often run mountain roads to pull goods and do special freight (such as dangerous refrigeration) to install them to ensure safety and timeliness.

Which brands of liquid buffers can I choose?

Having said that, my brother will introduce the mainstream brands of hydraulic retarder in China.

Voith (company name)

As the first manufacturer of automobile hydraulic retarder, Voith has always been in a leading position in this field. Now FAW, Dongfeng, Heavy Duty Truck and other brand models are loaded, which are common in high-power and high-end models. For example, the liberation of J7 has a 550-horsepower model matching Voith hydraulic retarder, which is regarded as "LV" among hydraulic retarder products.

○? Fig. Voith VR 1 15CT hydraulic reducer

According to the traffic environment of China market, Voith VR 1 15CT can bring the maximum braking torque of 3500n·m, which means it can undertake 80% of the braking task of the vehicle itself. In addition, the self-weight of 52kg can bring many economic benefits compared with the water spraying equipment of1t.

In addition, according to my brother's understanding, at present, due to the increase of market demand, the price increase of the whole vehicle equipped with Voith hydraulic retarder has been reduced from the original 30,000 yuan to about 20,000 yuan, and I believe this figure will decline to some extent in the future. If you are the kind of person who is afraid of trouble, I suggest you buy the model with Voith hydraulic retarder directly from the manufacturer.

Zef

ZF, which is famous for its gearbox, will naturally not lag behind others in the field of retarder, but ZF has an unwritten rule that retarder products are "proud" and can only be used with its gearbox. For example, Ou Man EST-A has a 5 10 horsepower model with ZF gearbox and hydraulic reducer.

○? Fig. ZF imported hydraulic reducer

ZF is the main sales product of ZF. Intarder is a hybrid additional brake integrated in gearbox for wear-free operation, which is superior to other products in braking power and response time, and the maximum braking torque can reach 4000 N m.

○? Photo: Tianlong flagship store is equipped with ZF hydraulic reducer.

If you are the kind of person who pursues "response time" when driving, I suggest you buy ZF, but you may also buy a ZF gearbox car.

Belfast

As one of the main gearbox suppliers of domestic brands, Fast also has a good performance in the field of hydraulic retarder. Like ZF, the fast hydraulic retarder is mainly used in conjunction with its own gearbox, which has a good bearing capacity on Shaanxi Automobile and Liu Qi Automobile.

○? Figure Fast hydraulic reducer products

○? Figure fast FH240 hydraulic reducer

For the heavy truck market, Fast has launched four products, such as FH400B and FHB360, with braking torque from 3200 to 4000 N m; For the light truck and bus market, there are also FH240 products with braking torque of 2400 N m. Compared with other brands, the fast hydraulic retarder can adapt to a wider range of vehicles.

In addition to the above three, you can also pay attention to Ningbo Huasheng, Shenzhen Teerjia and Guizhou Ram. As a domestic brand of hydraulic retarder, except for some differences in popularity and price, the working principle is similar except for the core technology.

Finally, after installing the hydraulic retarder, everyone must understand the working steps and precautions to avoid misoperation when driving.

First of all, the hydraulic retarder will also produce high temperature when it works. If the engine's cooling system can't take away the heat in time, the working efficiency of the hydraulic retarder will be greatly reduced and its service life will be affected. Therefore, when you use the hydraulic retarder, you should downshift ahead of time and keep the engine speed above 1500 rpm.

1. Just try not to use it when driving a single tractor, and it is best not to use it in sharp corners;

2. Be careful to use wet roads and cooperate with foot brakes. If necessary, turn off all auxiliary braking systems and take manual intervention;

3. In general, try not to use the maximum gear of hydraulic retarder;

4. Don't blindly trust and rely on the hydraulic retarder. Choosing the right gear to control the speed before going downhill is the correct operation.

postscript

Whether or not to replace the hydraulic retarder requires each owner to make a comprehensive judgment according to his own actual operation, and should not blindly obey the instigation of others; For those who blindly preach that the hydraulic retarder is not good without developing the dynamic braking model, my brother just wants to say: ignorance and fearlessness.

This article comes from car home, the author of the car manufacturer, and does not represent car home's position.