Views: 5 Author: Site Editor Publish Time: 2022-08-01 Origin: Site
The application of semi-trailer towing trailers promotes the development of car trains from a simple single-trailer mode to a double-trailer or even multi-trailer mode, which greatly improves the efficiency of logistics and transportation. However, this form cannot be applied in China at present. This paper introduces the classification, structural composition and function of semi-trailer traction trailers, as well as the application in North America, Europe, Australia and other regions. It is hoped that this form of transportation can be used in China. development and application.
The Dolly is mainly used for the connection of the front and rear trailers of a Double trailer or a Road Train. As a key connection conversion device, the semi-trailer traction trailer has played a huge role in promoting the development of vehicle trains from a simple single-trailer mode to a double-trailer or even multi-trailer mode, greatly improving the efficiency of logistics and transportation. At present, in North America (US and Canada), Europe and Australia, the technological development of semi-trailer tractor trailers is very mature, which has promoted the widespread use of double-trailer trains and multi-trailer trains in these regions. The following will introduce the semi-trailer towing trailer from the aspects of classification, structure composition and function and application.
1. Classification by number of axes
According to the number of axles, the semi-trailer traction trailer can be divided into two types, single-axle type and double-axle type.
The selection of the number of axles of the semi-trailer towing trailer is mainly determined according to the axle load distributed on the trailer towing seat by the semi-trailer at the rear. Since different countries and regions have different regulations on the vehicle axle load limit, the selection of the number of axles of the semi-trailer towing trailer should comprehensively consider the standard requirements and load distribution factors of the vehicle axle load limit.
2. Classification by connection method
According to the connection method between the semi-trailer towing trailer and the trailer (or bicycle), it can be divided into A-type semi-trailer traction trailer and C-type semi-trailer traction trailer.
A-type semi-trailer towing trailer: the structure of the towing bar of the trailer is A-shaped, and the towing ring at the front end (A vertex) of the towing bar is connected with the coupling seat of the front trailer (or bicycle). Since there is only one connection point with the front trailer (or bicycle), and the connecting rod structure is an A-shaped structure, the traction trailer has the advantages of good structural strength and flexible steering (including self-steering, steering with the trailer, etc.), and is widely used.
C-type semi-trailer towing trailer: There are two parallel tow bars on both sides of the trailer, which are respectively connected to the coupling seat of the front trailer (or bicycle) through the tow rings at the front ends of the two tow bars. The C-type semi-trailer towing trailer originated in Canada. It has two connection points with the front trailer (or bicycle), which has the advantage of good connection stability. But at the same time, it affects the steering flexibility of the semi-trailer towing trailer and reduces the mobility of the vehicle.
The tires of the semi-trailer trailer are easy to wear when cornering at low speed. Therefore, when designing the C-type semi-trailer towing trailer, a walking system with a self-steering mechanism is adopted to ensure its steering flexibility.
At present, double-trailer trains or multi-trailer trains in the United States, Europe, and Australia mainly use A-type semi-trailer traction trailers as connecting steering devices. Canadian double-trailer trains or multi-trailer trains are mainly connected by C-type semi-trailer traction trailers.