What is a drawbar trailer?

drawbar trailer is a special vehicle that is connected to a conventional truck and trailer at the rear by a hook. It additionally mounts a complete trailer body. This significantly enhances the truck's cargo transport capacity and at the same time facilitates It improves fuel efficiency and effectively reduces the overall cost of logistics operations. In the operation mode of the tow bar trailer, the towing vehicle does not need to directly bear the weight of the trailer, but is only responsible for providing the necessary driving force to assist the trailer in traveling. This also reduces the resistance on the road.

The structure of a full trailer is complex and sophisticated, mainly integrating multiple subsystems such as the frame, compartment body, traction connectors, steering system, suspension device, running mechanism, braking system and signal control. Among them, the frame is the core load-bearing component, and its longitudinal beam design usually adopts a linear upper airfoil. This design not only simplifies the production process, but also ensures high ground clearance and superior longitudinal passability. For heavy-duty flatbed drawbar trailers, the frame often adopts a box-section welding process to provide excellent torsional rigidity and lateral bending resistance to meet stringent structural strength and usage requirements.

In addition, the support beams and side beams of the frame, as key auxiliary structures, are precision welded to the main beam and extended to both sides to form a variable-section I-beam structure, which greatly enhances the longitudinal bending resistance of the frame. What is particularly worth mentioning is that a turntable device equipped with a balanced suspension is cleverly configured under each support beam. This design enables the full trailer to achieve flexible all-wheel steering, improving controllability and adaptability.

As for the significant difference between a semi-trailer and a full trailer, it is that the front end of the semi-trailer is not equipped with wheels, but relies on a kingpin device to be fixed in the fifth wheel or turntable coupling, and its front part is completely driven by the towing vehicle. The rear wheels are used for support. This feature makes the two have their own advantages in structure and application.

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