Liebherr has produced the largest non-segmented, large diameter bearing ever manufactured by the company, designed for compact bucket wheel excavators.
The roller bearing slewing ring, with a 7.5 meter diameter, weighs approximately 20 tonnes.
The roller bearing was design-optimised in collaboration with Sandvik Mining and Construction Materials Handling GmbH & Co KG. Due to the new raceway system, it offers a longer service life and better emergency running characteristics.
For its production, a hardening machine in the Biberach plant in Germany was modified to allow Liebherr to produce large diameter bearings with a diameters up to 8,000 mm in the future. The large diameter bearings can be used in mining, materials handling, and a broad variety of applications.
Site acceptance tests of the roller bearing took place in mid-June and the large diameter bearing was then delivered to a brown coal open pit mine in Hungary.