Product Description：

The semi-trailer fifth wheel is a crucial component in the coupling system that connects a semi-trailer to a tractor unit (also known as a truck or tractor-trailer). Here’s a breakdown of its key aspects:

1. Function: The fifth wheel assembly allows the semi-trailer to pivot and articulate relative to the tractor unit, enabling it to turn corners and navigate curves smoothly.

2. Location: It is mounted on the tractor unit and consists of a coupling mechanism and a horizontal plate. The trailer’s kingpin (a vertical pin located on the underside of the front of the trailer) fits into a slot on the fifth wheel plate.

3. Coupling Process: When coupling the trailer to the tractor, the driver backs the tractor unit towards the trailer. The kingpin of the trailer slides into the locking mechanism of the fifth wheel and locks into place automatically or manually, depending on the type of fifth wheel.

4. Types: There are various types of fifth wheels, including:

• Fixed Fifth Wheels: Common on most trucks, where the fifth wheel is stationary.

• Sliding Fifth Wheels: Allows adjustment of the fifth wheel’s position to redistribute weight on the truck's axles, improving balance and traction.

• Articulating Fifth Wheels: Provide additional articulation for improved maneuverability on rough terrain or tight spaces.

The semi-trailer fifth wheel is an integral part of the coupling system that enables efficient transportation of goods over long distances, making it a fundamental component in the logistics and transportation industry.

Product Parameters：

Application：

The semi-trailer fifth wheel is a crucial component in the coupling system between a tractor unit (also known as a prime mover) and a semi-trailer. Here are some key applications and functions of the semi-trailer fifth wheel:

1. Coupling Mechanism: The fifth wheel is designed to securely couple and uncouple the semi-trailer from the tractor unit. It provides a pivot point that allows the trailer to articulate with the tractor during turns and maneuvers.

2. Weight Distribution: The fifth wheel helps distribute the weight of the semi-trailer across the tractor unit and the trailer's axles. Proper weight distribution is critical for safe handling and stability during transport.

3. Articulation: During turns, the fifth wheel allows the trailer to articulate smoothly around corners without causing excessive strain on the tractor unit or the trailer itself. This articulation is crucial for navigating tight spaces and corners on roads.

4. Safety and Stability: A properly maintained fifth wheel ensures that the semi-trailer remains securely attached to the tractor unit at all times, minimizing the risk of detachment or accidents due to coupling failure.

5. Adjustability: Fifth wheels are often adjustable vertically to accommodate different heights of trailers and ensure proper alignment and weight distribution. This adjustability is essential for maintaining optimal handling characteristics.

6. Compatibility: Different types of fifth wheels exist to accommodate various trailer designs, including flatbeds, refrigerated trailers, tankers, and more specialized configurations. Each type is engineered to meet specific load requirements and operational needs.

7. Maintenance and Inspection: Regular maintenance and inspection of the fifth wheel are essential to ensure its proper functioning. This includes lubrication, checking for wear and tear, and verifying alignment to prevent premature failure.

Overall, the semi-trailer fifth wheel plays a critical role in the safe and efficient operation of tractor-trailer combinations, making it a fundamental component in the logistics and transportation industries worldwide.

FAQ:

Do you provide the sample before order made?

we're glad to provide sample for testing before mass production.

What's your payment methods?

Accept payment via T/T(Bank transfer), Western Union, and PayPal.

L/C is Ok when we keep Long-term stable cooperative relationship.

We're pleasure to make the Trade Assurance Order on Alibaba to protect the rights of our customers.

How long is your production time?

2 working days for some products in stock .

15 working days for most of goods.

5 weeks for bulk order.

All goods will test quality and size before package and shipping.

What's your shipping way?

By sea, by air, by train all is available, depend on you.

We choose direct shipping, so can be one week earlier than others.    

Is it possible to customization for special orders?

Yes. Customized service could be provided based on the design pictures or drawings.