Transitioning from Air Bags to Hendrickson Walking Beam Suspensions

[MikePhua]

Introduction
In the world of heavy-duty trucks, the choice of suspension system plays a pivotal role in determining vehicle performance, durability, and suitability for specific tasks. While air bag suspensions have been the standard for many years, there's a growing trend towards adopting Hendrickson's walking beam suspensions, particularly in vocational and off-road applications. This article delves into the reasons behind this shift, the benefits of walking beam suspensions, and the considerations for making such a transition.
Hendrickson's Legacy in Suspension Systems
Founded in 1913 by Magnus Hendrickson, a Swedish immigrant in Chicago, Hendrickson has been at the forefront of suspension technology. In 1926, the company introduced the first tandem walking beam suspension, revolutionizing the trucking industry by providing improved load distribution and enhanced traction . Over the decades, Hendrickson has continued to innovate, developing advanced suspension systems like the HAULMAAX® and PRIMAAX®, catering to a wide range of heavy-duty applications.
Understanding Walking Beam Suspensions
A walking beam suspension consists of a central equalizing beam connecting two axles. This design allows each axle to move independently, ensuring that all wheels maintain contact with the ground, even on uneven terrains. The primary components include:

• Equalizing Beam: A central beam that connects the two axles, distributing the load evenly.
  
• Pivot Points: Located at the center of the beam and at each axle, allowing independent movement.
  
• Springs or Dampers: Absorb shocks and vibrations, enhancing ride comfort.
  
• Bushings: Reduce friction between moving parts, ensuring smooth operation.
  

Advantages of Walking Beam Suspensions

1. Enhanced Traction: The independent movement of axles ensures that all wheels maintain contact with the ground, providing better traction on rough or uneven surfaces .
   
2. Improved Load Distribution: The equalizing beam distributes the vehicle's weight evenly across both axles, preventing overloading and reducing tire wear.
   
3. Durability: Walking beam suspensions are known for their robustness, making them ideal for heavy-duty and off-road applications.
   
4. Cost-Effectiveness: While the initial investment might be comparable to air suspensions, the longevity and reduced maintenance costs of walking beam systems can lead to lower total cost of ownership.
   

Considerations When Transitioning

1. Ride Comfort: Air suspensions typically offer a smoother ride, making them preferable for long-distance highway driving. However, advancements in walking beam designs have incorporated features that enhance ride comfort without compromising performance.
   
2. Vehicle Weight: Walking beam suspensions can be heavier than air suspensions, potentially affecting payload capacity. It's essential to evaluate the trade-off between durability and weight.
   
3. Maintenance: While walking beam systems are durable, they require regular maintenance to ensure optimal performance. It's crucial to establish a maintenance schedule and train personnel accordingly.
   

Case Study: Adoption in the Construction Industry
A notable example of the shift towards walking beam suspensions is observed in the construction industry. Companies operating in rugged terrains have reported improved vehicle performance and reduced downtime after transitioning from air suspensions to Hendrickson's walking beam systems. The enhanced traction and durability have proven beneficial in navigating challenging job sites.
Conclusion
The decision to move from air bag suspensions to Hendrickson walking beam systems is driven by the need for enhanced durability, improved traction, and better load distribution in demanding applications. While there are considerations regarding ride comfort and vehicle weight, the benefits of walking beam suspensions make them a compelling choice for vocational and off-road vehicles. As industries continue to evolve, adopting the right suspension system is crucial for optimizing vehicle performance and ensuring operational efficiency.