| Customization: | Available |
|---|---|
| Diameter: | 2inches/3.5inches/50/90mm/2"/3.5" |
| Loading Weight: | 150tons |
|
Still deciding? Get samples of $ !
Request Sample
|
Suppliers with verified business licenses
Audited Supplier Audited by an independent third-party inspection agency
The fifth wheel pin of a semi-trailer is a crucial component for connecting the tractor and the semi-trailer.
| Connect the tractor and the semi-trailer | It enables the tractor to tow the semi-trailer, ensuring a firm and reliable mechanical connection between the two. |
| Transmit force and torque | Transmit the tractive force, braking force, lateral force, etc., from the tractor to the semi-trailer. At the same time, it can also feed back the relevant forces of the semi-trailer to the tractor, enabling the coordinated movement of the two. |
| Bear vertical loads | Bear part of the weight at the front of the semi-trailer, including the weight of the goods and the vehicle body itself, and transfer it to the frame of the tractor to ensure the stability of the vehicle during driving. |
| Enable steering function | During the steering of the vehicle, it allows the semi-trailer to rotate at a certain angle relative to the tractor, enabling the vehicle to pass through curves, intersections, etc. smoothly. |
| Road transportation | Widely used in long-distance freight transportation, logistics and distribution, etc. It is an essential component for connecting the tractor and the semi-trailer in road cargo transportation. |
| Ports, freight yards, and other places | Used for the quick connection and disconnection of the tractor and the semi-trailer during the loading and unloading of goods, improving the turnover efficiency of cargo transportation. |
Types of the Fifth Wheel Pin of a Semi-trailer
- Classified by shape: There are mushroom-head types and leaf spring types, etc. The mushroom-head fifth wheel pin is more widely used. Its head is mushroom-shaped and fits closely with the fifth wheel of the tractor, being able to bear large vertical loads and horizontal forces. The leaf spring type fifth wheel pin has a relatively simple structure and realizes a certain elastic connection through the leaf spring, which is often used in some situations where the requirements for traction performance are not particularly high.
- Classified by size: Common specifications include 2 inches (about 50.8mm) and 3.5 inches (about 88.9mm), etc. The small-sized fifth wheel pin is suitable for light semi-trailers, while the large-sized one is used for heavy semi-trailers to meet different load-bearing requirements.
Parameters of the Fifth Wheel Pin of a Semi-trailer
- Diameter: It determines the matching accuracy between the fifth wheel pin and the fifth wheel as well as the load-bearing capacity. Generally, the larger the diameter, the higher the load-bearing capacity.
- Height: It affects the connection height between the semi-trailer and the tractor as well as the overall center of gravity of the vehicle. An appropriate height can ensure the stability and trafficability of the vehicle during driving.
- Head shape and size: Parameters such as the diameter and radian of the mushroom head should match the fifth wheel to ensure good contact and force distribution, reducing wear and stress concentration.
- Material and strength grade: It is generally made of high-strength alloy steel. The strength grades include grade 8.8, grade 10.9, grade 12.9, etc. The larger the number, the higher the strength, and it can bear greater tensile and shear forces.
The king pin is a key component for connecting the tractor and the trailer. Here is how it is used on the trailer and its installation method:
The Function and Usage of the king pin on the Trailer
- The king pin is usually installed at the front end of the trailer. It works in conjunction with the fifth wheel of the tractor. The tractor is connected to the king pin of the trailer through the fifth wheel to form a whole. The power of the tractor is transmitted to the king pin through the fifth wheel, and then drives the trailer to move. During the driving process, the king pin can also bear part of the vertical load of the trailer, as well as various forces generated during the vehicle's movement, such as the forces during acceleration, braking, and turning, etc., to ensure a firm connection between the tractor and the trailer, so that the two can work in coordination.
The Installation Steps of the king pin
1. Preparation Work: Ensure that the installation part at the front end of the trailer frame is flat and free of deformation. Clean the installation surface and remove impurities such as oil stains and rust. According to the type and load capacity of the trailer, select a king pin of the appropriate specification, and prepare the tools required for installation, such as wrenches, screwdrivers, jacks, etc.
2. Positioning and Fixing: Place the king pin at the predetermined installation position at the front end of the trailer frame, and initially fix it with positioning pins or bolts. Ensure that the center position of the king pin coincides with the longitudinal centerline of the trailer, and the height meets the matching requirements of the fifth wheel of the tractor.
3. Installing the Connecting Components: According to the structure of the king pin, install the supporting connecting components, such as the locking mechanism, anti-loosening device, etc. These components can ensure that the king pin will not loosen or fall off during use, and ensure the safety of the connection.
4. Tightening the Bolts: Use tools such as wrenches to evenly tighten the bolts fixing the king pin according to the specified torque requirements. Ensure that the bolts are tightened with sufficient force to prevent the king pin from loosening during use, but also pay attention not to over-tighten to cause damage to the bolts or deformation of the frame.
5. Inspection and Debugging: After the installation is completed, check whether the king pin is firmly installed and whether the locking mechanism can work properly. You can use a jack to lift the front end of the trailer to simulate the state during the vehicle's movement, and check whether the king pin and the fifth wheel fit smoothly, and whether there is any jamming or abnormal clearance. If there are any problems, adjust and repair them in a timely manner.
For different types and brands of trailers, the installation method of the king pin may vary slightly. When installing, it is necessary to operate strictly in accordance with the operation manual of the trailer and relevant standards.
Jining Shengda Machinery Co.,ltd is a comprehensive enterprise that integrates design, production, and sales of semi-trailer parts and semi-trailer, located in Jining City, Shandong Province, China. The company was established in 2004, mainly engaged in trailer axles, trailer suspension, trailer landing gear, trailer fifth wheel, trailer king pin,container fasteners twist lock, brake chamber, slack adjuster, air bank, semi trailer parts and semi trailer. Also distributes truck parts,excavator parts,bulldozer parts,agricultural equipment parts,,lifting platform parts,general machinery parts,used semi trailer,used truck and so on. It has various manufacturing equipment and more than 1000 experienced employees with a factory area of over 24000 square meters. Our company has large-scale production and warehousing capabilities. Improving product quality, improving employee quality, strict quality assurance system and sound management system, and high-quality after-sales service are our foundation. Our company adheres to the principle of "quality first, reputation first" and provides customers with various types of products with quality and quantity assurance. In the fierce market competition, keep up with the times, maintain innovation, and ensure product leadership! Relying on technology, continuously improving the technological content of the products sold, and creating higher market value for society, customers, and companies. Our company has always created enterprises with integrity, operated the market with integrity, and won a good reputation, as well as the respect of our domestic and foreign peers.
Q1. Can I get samples?
Yes.
Q2. Can I use my own logo or design on the goods?
Yes, we provide OEM/ODM services; your logo and design can be made on the products.
Q3. Do you have a factory?
Yes, we have a factory in Shandong Province. Welcome to visit our company and factory. We are a professional manufacturer and provide OEM/ODM services to customers.
Q4. How is the production capacity of your factory?
Our annual production capacity is 300,000 tons
Q5. When will it be shipped?
All our products are in stock and will be shipped within 5 days.
){kind=link}