Background and types of tractor trucks

In the market, tractor trucks are mainly divided into two categories: full-trailer tractor trucks and semi-trailer tractor trucks. Semi-trailer tractor trucks mean that the front half of the trailer is placed on the traction saddle above the rear section of the tractor truck, and the bridge behind the tractor truck bears part of the weight of the trailer. A full-trailer tractor truck means that the front end of the trailer is connected to the rear end of the tractor truck. The CNG tractor truck only provides forward pulling force and drags the trailer, but does not bear the downward weight of the trailer. Next, let's take a look at the background and types of tractor trucks.

Here is the content list:

• What is the background of a tractor truck?

• What are the types of tractor-trucks?

What is the background of a tractor truck?

With the rapid development of our country's economy and the country's great investment in road construction, road transportation has become the main mode of transportation in our country. Semi-trailer tractor truck, as the main equipment of road transportation, has been widely used due to their advantages of strong specialization, large loading capacity, and fast transportation. The traction seat is the connecting device between the tractor truck head and the semi-trailer. Although it is not a very complicated and eye-catching part, it is the most important safety equipment of a semi-trailer prime mover. Misoperation or improper maintenance may lead to serious safety accidents.

What are the types of tractor-trucks?

According to whether its support can move, it can be divided into fixed type, mobile type, and lifting type. The left and right supports of the fixed fifth wheel are fastened to the base of the fifth wheel by bolts, and the base of the fifth wheel is then fixed to the main beam of the tractor truck. Stationary is the most widely used one. There are many styles of mobile fifth wheels, and the structure is almost the same as that of the fixed one. The main reason is that the connection between the fifth wheel base and the 4x2 tractor-truck girder adopts a porous or toothed design. The base of the fifth wheel can be moved forward and backward according to the needs of connecting trailers, to connect with different trailers smoothly. Some mobile fifth wheel is also equipped with an automatic air pressure control device, which can push the fifth wheel to move forward and backward in the chute through air pressure. The lifting fifth wheel is mainly used on the tractor truck of the port terminal. The fifth wheel can move up and down within a certain range to adapt to semi-trailers of different heights.

According to different degrees of freedom, there is a single degree of freedom and a double degree of freedom. The single-degree-of-freedom fifth wheel is also called the single-axis fifth wheel. It can only do about 80 vertical tilts. This type of fifth wheel has high driving stability and is suitable for semi-trailers with high speed, light load, and high center of gravity running on good roads. The disadvantage is that the frame bears a large torque because it cannot swing laterally. The double-degree-of-freedom fifth wheel is also called the two-axis fifth wheel. It can swing horizontally and vertically and can protect the frame of the heavy-duty prime mover under different road conditions. Usually, the height of the double-axle fifth wheel is much higher than that of the single-axle type, and the lateral stability is not good during the turning process of the vehicle at high speed, so this type of fifth wheel is rarely used in ordinary road transportation.

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