A semi-trailer is a major category of trailers. It refers to a trailer with its axle placed behind the center of gravity of the vehicle and equipped with a coupling device that can transfer horizontal and vertical forces to the tractor. The semi-trailer itself has no driving force and needs to drive with the help of the traction force of the main vehicle.

The comprehensive economic benefit of semi-trailer transportation is high, which can be increased by 30-50% compared with ordinary monobloc vehicles, mainly for long-distance transportation of goods.

So, how many common semi trailers can be divided into? How to distinguish between different types?

1、 Classification according to the number of axles of semi-trailer:

According to axle classification, semi-trailer can be divided into four categories: single axle, double axle, three axle and multi axle.

Among them, single axle semi-trailer is the simplest semi-trailer, which has small curb weight, convenient manufacture, less tire wear and fuel consumption.

With the continuous development of the logistics industry, the requirements of vehicle owners for transportation efficiency are greatly improved, and the loading quality of semi-trailer is also relatively increased. In order not to exceed the provisions of axle load and total load, the main way is to increase the axle number of semi-trailer.

2、 Classification according to the structural characteristics of semi-trailer:

According to the structural characteristics, semi-trailer can be divided into variable wheelbase semi-trailer, axle lifting semi-trailer, multi traction pin semi-trailer and movable traction pin semi-trailer.

The variable wheelbase semi-trailer may be in the form of wheelbase movement relative to the frame of the semi-trailer. The transfer masses of j10bz, j15bz and j140bz in China are 7T, 8t and 10t respectively. The longitudinal beam is retractable, and the length of the container varies from 7 to 11m.

The axle can lift the semi-trailer. After lifting the axle, the attachment conditions are changed to reduce driving resistance and tire wear, but the structure is complex, and its actuator is pneumatic or hydraulic element.

Semi trailers with multiple traction pins generally have double traction pins and three traction pins.

3、 Classification according to the form and purpose of semi-trailer

It can be divided into flat semi-trailer, low flat semi-trailer, concave flat semi-trailer, box semi-trailer, dump semi-trailer, special container semi-trailer, container flat semi-trailer, container fence semi-trailer, liquid tank semi-trailer, powder container semi-trailer, livestock and poultry semi-trailer, prefabricated semi-trailer, long cargo semi-trailer, refrigerated semi-trailer, transverse semi-trailer Longitudinal semi-trailer and combined semi-trailer, etc.

4、 Classified according to the driving mode of semi-trailer

It can be divided into self driving semi-trailer and other driving semi-trailer. The self driving semi-trailer is equipped with engine drive, which reduces the power of the tractor, reduces the size of the train, and improves the driving stability, mobility and economy. Other driving semi trailers, i.e. ordinary semi trailers, are not equipped with engines and their transmission devices.

Among all the components of the semi-trailer, the role of the axle is very key. The load-bearing, braking transmission and driving transmission of the semi-trailer must be realized by the axle. If the axle quality does not pass, let alone economic benefits, I'm afraid even the most basic safety requirements can not be realized. Therefore, it is very important to choose a good axle.

Darong axle is the representative of time-honored axles in China, covering German axle, American axle, concave axle, special axle and axle related accessories. Darong group is the first axle R & D manufacturer stationed in Liangshan quanpu industrial park more than 20 years ago, and its technology and strength are at the forefront of the industry. Compared with peer products, Darong axle has high cost performance and high trust in the team and owner group.