A leading European manufacturer of wind turbines will use NSK high-load-capacity tapered roller bearings in the gearboxes of its 15 MW class offshore wind turbines. Mass production and delivery of the newly developed high-performance bearings is due to start imminently.
The decision to specify the next-generation NSK roller bearings hinged on several key factors. First and foremost, the bearings offer an increase in load capacity of approximately 25% over the conventional product by optimising the roller crowning shape (a slight arc shape that avoids stress concentration at the roller ends). The new bearings also deliver longer bearing life and lighter weight, making them perfect for reducing the construction and maintenance costs of large wind turbines.
The arrival of NSK’s bearing is timely: in 2023 the EU committed to 111 GW of offshore renewable energy by 2030 with 26 member states signing the European Wind Charter.
By adopting the high-load-capacity tapered roller bearing, manufacturers in this sector can overcome engineering challenges specific to wind turbines. For instance, the optimised shape of the bearing’s roller crown helps to withstand the demanding operating conditions that wind turbine gearboxes endure. NSK leveraged its numerical simulation expertise to derive the shape and equalise the contact surface pressure between the rollers and the inner and outer rings. This capability prevents excessive surface pressure at the roller ends, even under high loads, facilitating 25% more load capacity and more than double the service life of the conventional product.
With the conventional bearing, excessive contact pressure at the roller ends is unavoidable, typically prompting the selection of larger bearings to handle the high loads. In contrast, pressure is uniform with the new roller bearing, negating the need for upsizing and allowing a weight reduction of more than 30% under the same usage conditions.
As a final point of note, NSK’s expertise in production engineering saw the development of a new high-productivity processing technique to create the product’s intricate crowning shape.
Press pictures
1) The gearbox of a wind turbine and the new NSK high-load tapered roller bearing
2) NSK’s optimised roller crowning shape
3) The new NSK bearings offer uniform contact pressure at the roller ends
About NSK Europe
NSK Europe Ltd. is the European organisation of the Tokyo-based bearing manufacturer NSK, which was founded in Japan in 1916 and today employs nearly 25,600 people in its worldwide operations. The products and solutions provided by the industrial and automotive supplier can be found wherever things move. In addition to nearly all types of rolling bearings, the company’s portfolio includes housed bearings, linear technology, wheel bearing units, transmission and engine bearings. The company is oriented to perfection in all of its business activities. Its aim is quality leadership in its industry, which it strives for through a continuous process of improvement, excellent product development, optimised production processes and customer-oriented service processes. In fiscal year 2023, the more than 3,200 employees of NSK Europe Ltd. generated sales of over € 662 million.
www.nskeurope.com
Contact for journalists
Charlie Kortens
Tel. : +44 07407326874
E-mail : kortens-c@nsk.com
NSK Europe Ltd
Northern Road, NEWARK, Notts NG24 2JF
United Kingdom
