Semi trailer accessories, as the name suggests, refer to various parts used on semi-trailer. The more common ones are axle, suspension, leaf spring, outrigger, air chamber, air reservoir, steel ring, tire, relay valve, rope tensioner, spare tire lifter, pull rod, traction pin, lamp, etc., of which traction pin, axle, tire, steel ring, outrigger and suspension are the main purchased parts.
1. Traction pin
The main function of the traction pin is to connect the semi-trailer with the tractor, connect with the traction seat of the main vehicle, and drive the semi-trailer.
At present, the traction pins on the market are mainly divided into four types: assembly 50, assembly 90, welding 50 and welding 90. Users can choose and buy according to different models and actual use conditions.
2. Axle
The axle of semi-trailer, also known as axle assembly, is mainly used to load and maintain the normal driving of semi-trailer on the road. It is connected with the frame through suspension, and wheels are installed at both ends, which plays an important role in the power, stability and bearing capacity of the vehicle.
Generally speaking, when it comes to the power core of semi-trailer, car owners can easily think of engine and gearbox. But in fact, the axle is also one of the core power assemblies of semi-trailer, which plays a link role in the process of power transmission. If the axle is not selected well, it will directly affect the safe use of the vehicle.
3. Tyre
The tire is in contact with the road and bears the weight of the vehicle. Together with the semi-trailer suspension, it plays a role in mitigating the impact, maintaining good adhesion with the road, and improving the traction, braking and trafficability 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 are impossible to talk about.
Tires are rubber products, which will naturally age in addition to wear. Car owners usually need to pay attention to the maintenance and inspection of tires, clean up sundries in time, and replace them in time once cracks are found.
4. Steel ring
Also known as the wheel hub, it refers to the drum shaped part with the inner contour of the tire supporting the tire and installed on the axle. It is an important part of the semi-trailer. The driving process of semi-trailer will produce transverse and longitudinal loads, accompanied by driving torque and braking torque. Therefore, the hub needs to bear a considerable part of the load, with small longitudinal and transverse runout, small unbalance and moment of inertia, and high stiffness, strength and accuracy.
In order to meet the market demand, the steel rings launched by many manufacturers have been improved, such as sealing structure design, simplified maintenance process, extended maintenance cycle, etc. car owners can choose according to their needs at the time of purchase.
5. Landing gear
The semi-trailer is separated from the frame by the "outrigger", which is the key supporting device of the semi-trailer. The semi-trailer is separated from the frame by the "outrigger", and the semi-trailer is very important.
6. Suspension
Suspension is the general name of the force transmission connecting device between the frame and axle of semi-trailer. Its function is to transmit the force and torque between the wheel and the frame, buffer the impact force transmitted from the uneven road to the frame or body, and reduce the vibration caused thereby, so as to ensure that the vehicle can drive smoothly.
Semi trailer suspension can be divided into steel plate suspension, air suspension, rigid suspension and single point suspension. Among them, steel plate suspension has the highest application rate of ordinary semi-trailer in China. With the introduction and implementation of relevant laws and regulations, the utilization rate of air suspension is constantly improving, especially in the field of high-end transportation. The advantages of air suspension are more obvious and are more and more favored by car owners.
