In recent years, the state has paid more and more attention to environmental protection, and the new energy of vehicles has gradually become a trend. Especially in the field of passenger cars, almost all major brands have launched new energy models. With the rising international fuel prices, many heavy vehicles have also begun to enter the field of new energy.

At present, the common new energy heavy vehicles in the market mainly include electric dump truck, electric truck, electric tractor, electric special vehicle, electric sanitation vehicle, etc. today, let's focus on electric tractor.

Electric tractor can be divided into pure electric tractor and hybrid tractor.

1、 Pure electric tractor.

Pure electric tractor refers to a tractor driven entirely by electricity.

According to its power supplement mode, it can be divided into charging type and power exchange type. Among them, the rechargeable type requires the vehicle to load the power battery with the vehicle and rely on the external charging pile for charging; The power exchange type adopts the vehicle power separation mode, relying on the external power exchange station to replace the battery.

The main reasons for the relatively poor popularity of pure electric traction vehicles are as follows:

1. The dead weight of the vehicle is high. After the tractor is loaded with batteries, it is heavier than the fuel tractor of the same specification, which can generally be about 3T more. Because the tractor has to provide driving force for the semi-trailer in addition to driving itself, it has high requirements for the number and endurance of batteries, which also leads to its high self weight to a certain extent.

2. Rechargeable tractor charging is slow and inconvenient. Slow charging is a common disadvantage of rechargeable tractors. It usually takes several hours to fully charge. Even if fast charging is adopted, it usually takes about an hour. It is not suitable for semi-trailer with high requirements for transportation timeliness. In addition, there are few charging piles installed on the expressway, which makes it inconvenient to charge vehicles for medium and long-distance transportation.

3. The power exchange type has high cost and great difficulty. Compared with the rechargeable tractor, the power exchange type can reduce the time consumption caused by charging, but in the construction and use of the power exchange station, the requirements for place, intelligence, technology and cost are very high, and it is difficult to popularize.

4. Range is limited. Due to the low energy density of battery, the range of general electric tractor can not meet the needs of medium and long-distance transportation.

5. The cost of buying and using cars is on the high side. It is understood that the purchase cost and use cost of electric tractors are much higher than those of traditional fuel tractors, which ordinary users can't afford.

2、 Hybrid tractor.

Hybrid electric tractor refers to a tractor driven by electricity and fuel. It can be divided into three types: oil electric hybrid, plug-in hybrid and incremental electric.

1. Oil electric hybrid.

The driving force is provided by the fuel engine and the motor. Generally, the battery capacity is relatively small and no charging interface is provided. The energy recovery during the operation of the tractor is used for charging. The motor power of this model is small. In the scenarios of starting and acceleration, the motor assists the engine to provide power, reduce fuel consumption and improve operation efficiency.

The utility model has the advantages of no charging and convenient use; The disadvantage is that it is highly dependent on fuel, and the emission of pollutants is still relatively high.

2. Plug in hybrid.

The plug-in hybrid tractor is driven by the engine and motor, which can form a variety of combinations according to their different modes, such as pure electric, pure fuel, electric refueling, etc.

The advantage is that the charging port is designed, which can be charged at any time. Pure electric mode can be adopted when the power is sufficient, and pure fuel mode can be adopted when the power is insufficient, which is suitable for medium and long distance running, and the effect of energy conservation and emission reduction is better; The disadvantage is that the technology is complex, and the contradiction between battery weight and endurance is not well coordinated.

3. Add program electric.

The added program electric tractor refers to a tractor that is powered by an engine and driven by an electric motor. When the battery pack is fully charged, the pure electric mode is adopted for driving. When the battery is insufficient, the engine in the vehicle starts and drives the generator to charge the power battery.

The advantage is long mileage, but the disadvantage is that when running at high speed, because it needs the engine to drive the generator, the fuel consumption is high, so it can't get rid of its dependence on fuel.

For electric tractors, if they want to be popularized on a large scale, they also need to coordinate the self weight, traction force, mileage, cost, emission and other factors. Among them, the self weight of semi-trailer is also an important influencing condition. No matter what type of tractor, the lighter the semi-trailer, the more conducive to energy conservation and emission reduction.

The disc axle produced by Darong group is manufactured and formed by the classic American "one-piece" heat treatment process, and the bearing capacity has been greatly improved. Compared with ordinary products of the same specification, each axle can reduce the weight by about 15%, so as to help car owners save fuel, reduce tire damage and reduce the cost of comprehensive vehicles. Darong axle can provide personalized customized services according to the needs of users, perfectly match the vehicles and meet the use requirements of different car owners.