News | 02/12/2025

“For passengers to reach their destinations safely and comfortably”

Liebherr-Transportation Systems in Korneuburg (Austria) manufactures hydraulic systems for railway vehicles and buses in a workspace of around 11,000 m². The company has recently developed a new generation of hydraulic articulation dampers, which will be used in bus articulation systems produced by Hübner. Dieter Pflanzer, Director Operations at Liebherr-Transportation Systems GmbH & Co KG, introduces the new dampers.

Mr. Pflanzer, how are these new dampers used?

Dieter Pflanzer: Our customer Hübner integrates these types of dampers in articulated buses. We have developed the dampers, and they are installed in the articulation system produced by Hübner as a complete unit. The articulation system connects the front and rear part of the bus and consists of a joint with two Liebherr dampers and the folding bellows. Our dampers ensure that the articulated bus can manage cornering and straight travel safely and comfortably.

This requires the damping to continually adjust depending on the driving situation. The adjustment is performed by the articulation control using a proportional valve on the damper.

What is required of these articulation dampers?

Dieter Pflanzer: The articulation dampers must withstand high pressure of up to 500 bar, which is a remarkable requirement. They also have to function smoothly and, above all, safely under tough operating conditions for many years.

The dampers are assembled in Korneuburg. Which are the biggest production challenges and how big are the planned quantities?

Dieter Pflanzer: The production line comprises various machines, test devices, a paint line and the final inspection point. Several thousand dampers have been produced up to now at our Korneuburg site. To ensure the shortest possible manufacturing times, streamlined and precisely coordinated production procedures are essential for an annual production rate of 6,000 – 10,000 units. We constantly monitor quality and productivity, and continuously improve as we work. With these kinds of quantities, any additional action could impact production.

Thus, on an articulated public bus, there is a very good chance that the articulation system is stabilized by Liebherr dampers?

Dieter Pflanzer: Correct. Almost all notable articulated buses operate using articulation systems from Hübner and these are almost all fitted with Liebherr dampers. For passengers to reach their destinations safely and comfortably, the dampers are essential components in an articulated bus.