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Function & significance of the leaf spring

Leaf suspension is a tried-and-tested suspension technology that generates spring force and ensures load distribution by means of stacked spring leaves. It ensures that the vehicle weight is carried evenly and upward and downward movements are balanced in a controlled manner – a proven solution in commercial vehicle applications.

Precise accessories for stable spring suspension

The associated accessories category includes components such as bearing bushes for the spring eye, wear plates, spring clips and buffers for leaf spring plates. For these accessories to function reliably, the dimensions, tolerances and connection points must be precisely coordinated so that loads are transferred safely and the spring travel remains correct.

Leaf spring suspension

What should you look out for when buying:

DIMENSIONS

Make sure that the bearing bush, wear plate or spring clip matches your leaf spring type and spring dimensions exactly.

REQUIREMENTS

Choose components that can withstand the intensive leaf spring loads as well as the forces and vibrations of daily operation.

FIXING

Check whether the components can be installed in your existing spring suspension without additional adjustments.

Leaf springs in trucks: robustness under extreme conditions
In the commercial vehicle sector, leaf springs are still the preferred solution for axles that have to carry extremely high loads, particularly on the front axles and in heavy tippers, construction or municipal vehicles. It is characterized by its unsurpassed robustness, reliability and the ability to provide longitudinal and lateral axle guidance in addition to suspension. Truck leaf springs consist of solid layers of high-strength spring steel and are designed to safely cope with dynamic impact loads, high bending moments and permanent static loads. Precise adjustment to the expected leaf spring load is essential for the longevity of the entire chassis.

Critical role of accessories and attachment
The longevity of the leaf suspension depends crucially on the quality and condition of the associated accessories. The spring clamps must fix the spring assemblies to the axle with extreme force and precision in order to prevent slippage under braking and driving forces. Bearing bushes in the spring eye (often made of rubber-metal) and spring bolts are exposed to permanent shear forces and vibrations and must be checked regularly for play. Any wear at these bearing points not only impairs ride comfort, but also the directional stability and steering behavior of the loaded truck.

Materials and maintenance safety
Modern leaf springs for commercial vehicles are sometimes designed as lighter parabolic springs, where the leaves are thicker in the middle and thinner towards the ends in order to save weight without reducing the load-bearing capacity. Regardless of the design (multilayer or parabolic spring), the material quality of the spring steel is decisive for the breaking strength and elastic properties. When replacing leaf spring components, attention must always be paid to original equipment quality (OE quality) to ensure that the components can withstand the high loads, torsion and adverse environmental influences (dirt, road salt) of continuous commercial use and ensure the operational safety of the chassis structure in the long term.

Frequently asked questions about leaf suspension: technology, maintenance & load

The leaf suspension supports the vehicle weight, ensures even load distribution and dampens upward and downward movements to ensure driving stability.

The stress increases due to high static loads (payload), dynamic impacts on uneven road surfaces and corrosion (road salt/moisture), which accelerates material fatigue.

Replacement is necessary if there are visible cracks, the vehicle is “hanging” on one side, the spring layers are heavily corroded or the spring force has noticeably decreased.

While trapezoidal springs consist of many layers of the same thickness, parabolic springs have fewer but specially shaped layers. This saves weight while maintaining the same load-bearing capacity and improves suspension comfort.

Spring clamps fix the spring assembly to the axle. Inferior brackets can loosen, causing the axle to slip and resulting in dangerous driving behavior.

Bearing bushes absorb vibrations and allow the spring eye to move. Wear at these points leads to play in the chassis and poor directional stability.

Regular cleaning to remove dirt and salt, checking the fastening elements (torque of the brackets) and lubricating the moving parts (if provided) will considerably increase the service life.

Components in OEM quality guarantee a perfect fit and material quality. This is the only way to ensure that the components can withstand the extreme stresses of commercial use in the long term.

Reliably secure spring force!

Precisely fitting bearing bushes, wear plates and spring bridge elements ensure that your leaf suspension is stable and low-maintenance. Discover the right parts and equip your suspension with high-quality technology.