Chassis semi-trailers

The chassis semi-trailer is the basic type of the semi-trailer, on which various types of open and closed bodies are mounted.

In fact, it is the frame of cargo semi-trailer with chassis of several axles and a mechanism for attachment to the tractor unit. All frames can be grouped into two types according to their assembly principle - welded ones and those assembled with lock bolts. In the front part of the frame, there is a support platform with a pivot, which allows concatenation with the fifth wheel mechanism of the tractor unit, as well as extensible jack pads.

Typically, a chassis semi-trailer has two or three wheel axles, although in some cases the number of the axles can be as high as eight or more (this mostly concerns chassis semi-trailers designed for transportation of extra heavy loads). Additional equipment often includes a system that allows retracting one or more axles, which reduces tire wear at empty running.

The design of chassis semi-trailer creates the possibility to mount different types of cargo bodies on its frame: open (flatbed, tipper semi-trailers, cargo platforms), closed (vans, tilt semi-trailers, refrigerators), special ones (transport of poultry, grain, glass), and tanks.

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