Store in the sun without lubrication

The motion plastics specialist Igus has now launched an optimized version of its successful igubal ESQM pillow block bearing for tracking solar modules. The ESQM 2.0 is a lubrication- and maintenance-free solution for the safe storage of solar trackers according to the position of the sun. With a slim design, users can save installation space and continue to rely on a proven bearing solution made of UV-resistant high-performance plastics.

So that solar panels can generate energy efficiently, operators of solar parks rely on movable modules that automatically align themselves according to the position of the sun. The igubal ESQM pillow block bearings from Igus have proven themselves for 15 years for the storage of these modules. This is a pillow block bearing made of high-performance plastics that consists of a split housing and two spherical half-shells for easy assembly. A square profile is attached to the housing, which serves as a support for the solar modules.

The spherical half-shell enables angle compensation of up to 9 degrees and a high radial load capacity of up to 50 kN. "We are in constant communication with our customers who use our products in solar parks around the world. We are very interested in finding out how users get on with the products and where we can further optimize them. Through this direct exchange, we have now developed the ESQM 2.0," says Richard Won, Solar Industry Manager at Igus GmbH.

Slim design saves installation space and makes assembly easier

The ESQM 2.0 uses a new design. The spherical halves now have a U-shape with an integrated slot, so that cables can now also be fed through the bearing. Two small pins under the housing ensure easy and slip-free assembly, also thanks to the tried-and-tested split housing. The slim design not only saves material, but also provides additional installation space in height. A sheet metal bracket that can be easily mounted over the spherical cap ensures that the spherical cap is held securely in the housing. "When it comes to the materials we use, we also rely on our newly developed, extremely UV-resistant polymers," says Won.

As with all Igus plastics, users of solar parks can also completely do without lubrication and maintenance. The solid lubricants integrated in the plastic ensure that the plain bearing runs dry. This results in immense cost and time savings: every year, 240 billion dollars are spent on lubrication alone in all industries worldwide. In addition, there are associated maintenance costs of at least 200 billion dollars. Despite this, failures due to insufficient lubrication amounting to 750 billion dollars still occur.

The use of lubrication-free Igus components therefore reduces maintenance costs and protects both personnel resources in times of a shortage of skilled workers and the environment. This is because there is no risk of lubricating oil or grease seeping into the soil of the open spaces on which the solar parks are located. "With the ESQM 2.0, we have been able to further optimize our already very good ESQM in order to offer customers the optimal solution for their solar tracker applications. Like its predecessor, it has a 25-year functional guarantee," explains Richard Won.