Liebherr shows carbon fiber hydraulic cylinder at Bauma 2022 • AT-Aandrijftechniek

Liebherr produces hybrid cylinders in-house efficiently and economically on the modern, robot-controlled filament winder (photo: Liebherr Components)

Something that has less mass can move faster and needs less energy to move. This is one of the reasons why Liebherr Components has developed what they call a ‘hybrid’ hydraulic cylinder. This cylinder consists partly of carbon fiber composite and partly of steel. At Bauma 2022, Liebherr will show the hybrid cylinder to the public. In addition, an online configurator for hydraulic cylinder series will be presented. The hybrid cylinders within the series production program at 380 bar are also immediately available here.

Lightweight construction is considered an important trend and driver, not only in construction equipment, but also in stationary applications. If weight can be saved by using suitable components, there is a significant benefit to each machine’s application and daily use. Hybrid cylinders from Liebherr make a valuable contribution to this, because the classic components are made of steel in a carbon fiber composite package.

Production of carbon fiber composites

Liebherr’s Components product segment initially launched its carbon fiber composite business in 2019. Meanwhile, the Components plant in Kirchdorf an der Iller (Germany) has not only gathered additional expertise and expanded its production capabilities, but has also been working on the transfer of this technology in its established hydraulic portfolio.

Available in 380 bar series

An important result of this is the so-called hybrid cylinders, which are part of the product range within fiber composites. Already now, after preliminary development and targeted design, all classic hydraulic cylinders can be wrapped with CRP. In some areas of application, solutions are even possible without extensive packaging efforts. The hybrid cylinder variant is integrated as standard in the 380 bar series and is available as a separate option.

Why hybrid cylinders?

If weight plays a decisive role in the given application (e.g. due to road approval), hybrid cylinders are the right choice. Simple replacement of existing Liebherr hydraulic cylinders is possible here. When specifically designing a hybrid component to save weight, the positive properties of fiber composites, such as stiffness, strength and density, become an advantage.

Less fuel consumption and emissions

The effect of using a lightweight component such as a hybrid cylinder varies depending on the application. Weight savings can increase work speed, increase implements and booms and increase payload. In addition, emissions and fuel consumption are reduced.

Cooperation with customers

The basis for the necessary improvement is cooperation with customers. The Liebherr team accompanies them from the development of the solution-oriented product to delivery and far beyond. This is crucial with fiber composites, as the product’s structure and individual DNA are critical to achieving the desired results.

Additional steps in the development area

The company has already achieved remarkable results, for example in field trials in the mining sector. Liebherr can transfer this knowledge to other applications and expand it further. The goal is not a hybrid cylinder, but a full-fledged CRP cylinder.

Although a number of steps are still needed before this can be achieved, Liebherr is already working on fusing concepts between, for example, steel and fiber composite parts and testing the results. The implementation of CRP conversions in combination with steel parts is applicable to other products in the portfolio. In future, for example, piston accumulators can be settled from CRP. Here, too, complete CRP solutions are possible, which are tested systematically.

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