TrelleborgVibracoustic develops new air spring technology


TrelleborgVibracoustic, a supplier of vibration control technology, has developed a bellows technology for air springs. The “ZAX bellows” combines the advantages of the cross-ply and axial bellows previously used in passenger cars.

TrelleborgVibracoustic has previously produced cross-ply and axial types of bellows. They differ in terms of the structure of the reinforcing fibers embedded in the bellows. With an axial bellows, the fibers embedded in the elastomer run axially to the deflection direction. In contrast to this, the cross-ply bellows has two intersecting layers of reinforcing members, but they are not connected as opposed to a fabric. The newly developed cross-axial bellows, or ZAX bellows, combine the good torsion decoupling capability of the axial bellows with the dimensional stability of the cross-ply bellows.

The new technology will go into series production in 2015 on the rear axle of a number of new SUVs. Since the air springs in this stand-alone application, are not guided by the integrated vibration dampers, they need to absorb high gimbal and torsional forces. TrelleborgVibracoustic states that cross-ply bellows previously used on the rear axle usually require an elastomeric element or a plain bearing for torsion decoupling. The claimed upshot of this is reduced tension and improved initial suspension response. TrelleborgVibracoustic states an additional benefit of eliminating the torsion-decoupling element, is a reduction in production costs for the ZAX bellows.

TrelleborgVibracoustic states that every second passenger car that runs on air springs is equipped with its products.


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Alasdair joined the team in 2015 and works across a number of titles and websites for UKi Media & Events. He has been a journalist for 10 years, covering everything from travel and technology to sport and entertainment, and brings a wealth of experience, and pedantry, to the team. Away from the office, he is a celebrated snood connoisseur, determined to cycle no matter what the weather decides to hurl from the sky, and driven by a quest to find the very finest, and more importantly the next, slice of cheesecake.

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