What are the main structures of the tractor-truck?

The train is divided into two parts, the tractor truck, and the semi-trailer. The tractor truck is connected with the semi-trailer through the saddle-shaped traction seat to carry and transmit traction to pull the semi-trailer. The semi-trailer can be detached from the tractor truck at will and can be parked independently on the road by using the supporting device. The tractor truck is refitted from a special automobile chassis and is usually used to tow the whole vehicle directly, with a saddle-shaped traction seat on it to connect and hold the semi-trailer. The 4x2 tractor truck is mainly composed of the fifth wheel, traction pin, support device, suspension device, axle, spare tire rack, and other parts. The structure and function of its main components are briefly introduced as follows:

Here is the content list:

l Fifth wheel

l Towing pin

l Supporting device

l Suspension and Axle

l Spare tire rack

Fifth wheel

The traction seat is the connection mechanism between the tractor truck and the semi-trailer, which is convenient for the connection and separation of the two. The seat plate of the traction seat is made of pressed steel plate, and there is an oil groove on the seat plate, which can store lubricating grease, to reduce the wear of the seat plate and the traction pin plate on the semi-trailer. There is a rubber shock absorber at the connection between the two support shafts and the bracket, which has the function of reducing impact and reducing wear. Pushing and pulling the joystick can make the lock block open and close so that the semi-trailer can be connected or separated.

Towing pin

The traction pin is an important component that connects the semi-trailer to the 6x4 tractor truck and bears the traction. The traction pin is connected to the traction saddle. The traction pin is forged from 40Cr alloy structural steel with reliable performance. Sometimes the fastening bolts should be checked frequently for looseness.

Supporting device

The front end of the semi-trailer frame is equipped with a supporting device for use after the semi-trailer is separated from the tractor truck. The support device is a hand-operated two-speed single, linkage (optional) mechanical type, which is composed of two left and right outriggers. The main components of the outrigger include a two-speed gearbox, a support sleeve, a support rod, a transmission screw, and a support disc. Operate the support device, use fast speed when unloaded, and slow speed when a heavy load is used. For outriggers that are frequently used, in the secondary maintenance, the end cover of the gearbox should be opened, grease should be added, and the bolt fastening of other parts should be checked.

Attention: Do not use fast when supporting the weight of the legs.

Suspension and Axle

The suspension device of the semi-trailer adopts non-independent steel stamping rigid suspension (air suspension is optional), which is composed of serial leaf springs and suspension supports. The tractor-truck has a reasonable structure, strong rigidity, and strength, and is used to support the load and reduce the impact. The axle is a supporting bridge, which has the advantages of good braking performance, large bearing capacity, reasonable structure, and reliable performance. The axle is connected with the suspension device and the frame through leaf springs and pulls rods to support and transmit the force between the frame and the wheels.

Spare tire rack

The tractor truck adopts a catenary spare tire lifter. When in use, first lower the chain assembly of the spare tire lifter to an appropriate position. Then put the bracket into the spoke hole by hand and install it, insert the crank handle into the outside of the connecting rod, and press clockwise to make the spare tire go up at the same time through the chain assembly. Finally, tighten the nuts on the bracket with a force distance of 14 knives and 4m. Conversely, turn the adapter counterclockwise to lower the spare wheel.

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