Flatbed Trailer

Features

Self-propelled, independently-supported vehicles that are towed by other vehicles.

Variety

There are many types of full trailers, with their basic frames, bodies, and running systems generally similar to those of trucks. The panel-type trailers are usually made of thin steel plates, with longitudinal grooved panels pressed onto the deck plates and transverse ribs welded to increase rigidity and reduce weight. The floor of the trailer is typically made of wood and covered with thin steel plates, or a wooden-steel composite structure. The frame is commonly made of 16Mn steel plate, either stamped, shaped, and welded or bolted together. The frame's longitudinal and transverse beams often use a channel-shaped interface structure, with two longitudinal beams of equal width front to back, providing good bending resistance.

Composition

A trailer typically consists of the frame, body, towing device, steering mechanism, suspension, running gear, braking system, and signaling system. The upper flange of the straight-beam frame is flat. Its advantages include a level trailer deck, simple manufacturing process, high ground clearance, and good longitudinal passage. Heavy-duty flatbed trailers are designed to meet their structural and operational requirements. The frame is mainly composed of the main beam, cross beam, support beam, and side beam. The entire vehicle's load is transferred to the ground through support beams between cross beams, suspension, wheel axles, and wheels. The frame's main beam, support beam, and side beam are welded box-section components with high torsional stiffness. The cross beams connecting the main beams extend outward to form an I-shaped welded structure with high lateral bending strength. The height dimension of the main beam is relatively large and extends downward, thereby increasing the frame's longitudinal bending strength without raising the deck height. Under each support beam, there is a pivot mechanism for installing a balanced suspension to enable full-wheel steering.

The cargo transported by heavy trailer units is of significant weight and dimensions. Generally speaking, the strength of the chassis should be increased and its height minimized for ease of loading, unloading, and transportation. Trailer chassis are categorized by the structure of their longitudinal beams into through-beam, step-beam, and under-beam chassis.

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