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NKE has introduced modular bearing systems for planetary gears in wind-turbine gearboxes.

NKE’s bearing systems consist of cylindrical roller bearings that are fitted directly into the planetary gear.

The bore of the gear acts as the outer raceway, so that the bearings themselves do not have an outer ring.

The bearing systems are developed to customer specifications.

For gearboxes rated 1.5, 2 and 2.5MW, NKE has realised projects with such modular systems consisting of single-row cylindrical roller bearings without outer race.

The bearings have bore diameters of 160, 190 and 200mm, with versions up to 220mm being developed.

The choice of bearing depends on the available space – in particular when replacing existing bearings – as well as customer requirements.

To further boost their load capacity, the cylindrical roller bearings feature an improved internal design that is even stronger than that of the standard types.

These bearings are fitted with an inner race-guided, one-piece brass cage, which contains inspection grooves for endoscopic condition assessment of the inner race surface as standard.

For higher loads and wider gears, the bearings can be assembled to sets of two, three or four bearings.

The designs of the planetary bearings can be standardised.

The planetary gear design can be unified for the first and second gear stage and across various gearbox sizes, which reduces the required number of rolling-bearing variants; The modular design simplifies the adaptation of bearing-set characteristics to the requirements of each gear stage.

The one-piece solid-brass cage provides rolling element guidance during rapid acceleration and the lubrication grooves provided as standard simplify lubrication of the planetary gear bearings.

Beside modular planetary gear bearings, NKE also supplies all other bearings for use in wind-turbine gearboxes, main shafts and generators.

These include full-complement cylindrical roller bearings, as well as cylindrical roller bearings with cage, taper roller bearings, spherical roller bearings and four-point contact and deep-groove ball bearings.

NKE AUSTRIA GmbH – a manufacturer of premium bearings – was founded in 1996 by a group of senior staff members of the former company Steyr Wälzlager. Within a decade, the NKE brand has emerged on the world bearing market as a significant alternative in the premium class.

We offer both standard and special bearings for all industrial applications as well as technical services, including product development, application engineering, consulting, documentation and training.

NKE’s core functions – such as engineering, product development, final processing of components, modular assembly, quality assurance, logistics, sales and marketing – are centralised at our headquarters in Steyr, Austria. The site is certified to ISO9001:2008,  ISO14001:2004 and OHSAS 18001. In April 2006, NKE was awarded the Austria Quality Seal in recognition of its high quality standards.

Today, NKE bearings are distributed in more than 60 countries through over 240 distributors and 18 international representative offices

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