With the increasing prosperity of my country's maritime transportation, road freight and container transportation markets, the heavy-duty semi-trailer market is also developing, and the market demand for various accessories related to it is also increasing.

1. What are the accessories of heavy-duty semi-trailers?

Heavy-duty semi-trailer accessories, as the name suggests, refers to various parts used on heavy-duty semi-trailers, the more common ones are axles, suspensions, leaf springs, outriggers, air chambers, air tanks, steel rings, tires, relays Valves, rope tensioners, spare tire lifters, tie rods, traction pins, lights, etc., of which traction pins, axles, tires, steel rings, outriggers, and suspension are the main purchased parts.

2. Common heavy-duty semi-trailer accessories

1. Traction pin

The main function of the traction pin is to connect the semi-trailer with the tractor, connect it with the traction seat of the main vehicle, and tow the semi-trailer. At present, the traction pins on the market are mainly divided into 4 types, assembly 50, assembly 90, welding 50, welding 90, users can choose according to different models and actual use conditions.

2. Axle

The semi-trailer axle, also known as the axle assembly, is mainly used to bear the load and maintain the normal driving of the semi-trailer on the road. Bearing capacity and so on play an important role. Under normal circumstances, when it comes to the power core of a semi-trailer, car owners can easily think of the engine and gearbox. But in fact, the axle is also one of the semi-trailer power core assemblies, which plays a linking role in the power transmission process. If the axle is not selected properly, it will directly affect the safe use of the vehicle.

3. Tires

The tires are in contact with the road surface and bear the weight of the car. Together with the suspension of the semi-trailer, they play a role in mitigating the impact, maintaining good adhesion to the road surface, and improving the traction, braking and passing of the semi-trailer. If a semi-trailer is not supported by wear-resistant, heat-resistant and durable tires, its safety performance and economic benefits will not be possible. Tires are rubber products, which will naturally age in addition to wear and tear. Car owners usually need to pay attention to the maintenance and inspection of tires, clean up debris in time, and replace them in time if cracks are found.

4. Steel ring

Also known as the wheel hub, it refers to the inner profile of the tire that supports the tire, the barrel-shaped component that is mounted on the axle in the center, and is an important part of the heavy-duty semi-trailer. The semi-trailer travel process will generate lateral and longitudinal loads, accompanied by driving torque and braking torque, so the hub needs to bear a considerable part of the load, the longitudinal and lateral vibration should be small, the unbalance and inertia moment should be small, and the stiffness, strength and accuracy should be small. high. In order to meet the market demand, the steel rings launched by many manufacturers have been improved, such as the design of the sealing structure, the simplified maintenance process, and the extension of the maintenance cycle. Car owners can choose according to their needs when purchasing.

5. Outriggers

The outrigger is a semi-trailer support device, which utilizes the principle of "standing on the top of the jack" and is located at the front end of the semi-trailer frame. It is used after the semi-trailer is separated from the tractor. As an important tool in the area where the force is concentrated, its role is very critical.

6. Suspension

Suspension is a general term for the force transmission connection device between the frame and the axle of a heavy-duty semi-trailer. Impact force, reduce the vibration caused by it, to ensure that the car can run smoothly. Heavy-duty semi-trailer suspension can be divided into steel plate suspension, air suspension, rigid suspension and single-point suspension. Among them, steel plate suspension is the most widely used domestic semi-trailer. With the introduction and implementation of relevant laws and regulations, the utilization rate of air suspension is increasing, especially in the high-end transportation field, air suspension has obvious advantages and is more and more favored by car owners.