What parts does a trailer consist of?

The picture above shows the structural sketch of an ordinary semi-trailer, we can clearly see the main components and location of the trailer, let us explain each part in detail.

FRAME

The frame is the main component used to support the load, install the traction pin, suspension, support and other devices, consisting of beams, support beams, connecting beams, side beams, locks, traction pin connectors, panels and so on.

BODY

gantry

side board

Gantries are generally movable and detachable (without special requirements), so it is necessary to weld the gantry to the basis and add two diagonal pulls again when often transporting heavy or easily sliding goods.

TRACTION PIN

Traction pin is an important member of the semi-trailer to connect with the tractor and bear the traction force, connected with the traction seat. According to the diameter of the traction pin can be divided into 50 (mm) and 90, according to the assembly method can be divided into welded and assembled. Generally made of carbon steel and alloy steel forging.

SUSPENSION SYSTEM

Semi-trailer suspension system is the semi-trailer frame and axle connected to a full set of devices in general, with the role of load transfer, shock absorption. General semi-trailer suspension are used in non-independent steel plate stamping type rigid suspension, composed of tandem steel plate spring and suspension support.

Due to the use of special-purpose vehicles for different purposes, the design of the suspension also has different requirements, suspension commonly used in four kinds: steel plate suspension, single-point suspension, air suspension, rigid suspension.

steel plate suspension

single-point suspension

air suspension

rigid suspension

Semi-trailer axle is an important part of the trailer, through the suspension connected to the frame of the semi-trailer to play a load-carrying role, to maintain the normal operation of the vehicle on the road.

ELECTRICAL SYSTEM

The electrical system of the trailer consists of seven-core sockets, cables, air circuits, and various lamps and lanterns. Circuit is mainly used for lighting and signaling, air circuit is used for normal driving brake, emergency driving brake.

SUPPORT DEVICE

The trailer support device is mainly used to support the trailer when it is detached, and the support device has two types: single-acting and linkage, mainly composed of legs, connecting brackets, and other components.

PROTECTIVE DEVICES

Trailer guards are composed of side guards and rear guards, which mainly play the role of protection and blocking to protect pedestrians and other vehicles from enter under the semi-trailer.

1. Rear guardrail type:

ACCESSORIES 

Other accessories on the semi-trailer include toolboxes, spare tire racks, stakes, and so on. There are also some small accessories such as rope tighteners, rope hooks, which are very functional, according to the type of goods you choose to install.