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PRODUCTS
BEARINGS
SUSTAINABLE AND COMPACT ROLLING BEARING SOLUTION DEVELOPED
A series of compact rolling bearings for heavy-duty industrial gearboxes and construction machinery has been launched by Schaeffler. With these, users from the industrial and off-road segments now have a sustainable, reliable and convenient-to-use rolling bearing solution for highly loaded shafts. The NJ23-ILR series are equipped with the high-
performance MPAX cage, and have a very high dynamic load capacity. In fact the load rating has been increased by an average of 24%, doubling the operating life compared to the NJ23 basic type. According to the company, the new components perform
better than commonly available bearings of the same basic type, even under mixed friction conditions due to insufficient lubrication. The replacement of NJ23-ILR bearings at the end of the lifecycle is carried out in accordance with DIN 5412-1. Traditionally, rolling bearings for heavy-duty industrial gearboxes and construction machinery must withstand very high radial loads and also be capable of supporting axial forces on one side. Now, however, the highly loaded bearing positions on high- speed shafts and intermediate shafts in gearboxes also require ever-increasing basic dynamic load ratings, as do the high acceleration forces in vibratory machinery and the heavy vibrations in soil compactors. The expectations regarding the strength characteristics of the cage guidance system are also constantly increasing, while less and less space is available due to the general trend towards downsizing and a greater performance density. In the interests of sustainability and
reducing CO2 emissions, the bearings should offer high durability and combine economic efficiency with environmental and climate protection. The cylindrical roller bearings of the new NJ23-ILR series are available from the
first quarter of 2024 with bore codes 16 to 44 and from Q4/2024 with bore codes 48 to 60. The bearings in the size range up to bore code 36 already have the X-life quality seal for a longer operating life, higher load carrying capacity, and a compact design.
Schaeffler (UK)
www.schaeffler.co.uk/en
BEARINGS FOR WIND TURBINE APPLICATIONS
In recent years we have witnessed a growing
commitment on the part of the European business community to promote the use of sustainable energy alternatives. Wind energy is emerging as an optimal option, offering not only a renewable and clean energy source, but also opportunities to mitigate the
impacts of climate change and promote the transition to a more sustainable future. NKE is therefore looking to establish itself as a leading company in the sustainable manufacturing of high- performance bearings for wind turbine applications. Wind turbine maintenance can present major challenges, so gearbox bearings must be exceptionally reliable. NKE solutions are designed for mounting in turbines with power ratings ranging from 100 kilowatts to several megawatts. With insulation crucial, NKE adds a black oxide-coating
to its bearings which provides a protective coating on the functional surfaces of the application. Among other advantages, bearings with black oxide finish offer superior rolling and wear characteristics. For extremely demanding applications, NKE also has a wide range of different materials and heat treatments that can optimise bearing performance. Wind turbine generators are also essential elements and must operate under extremely difficult conditions. The bearings used here need to withstand problems caused by electrical currents or discharges. To help, NKE offers bearings with insulating coatings as well hybrid bearings which reduce friction and operating temperature, improving overall conditions and thus extending the service life of the lubricant and the bearing itself.
NKE
www.nke.at
POLYMER BEARINGS SUIT THE HYDROPOWER MARKET
Self-lubricating bearings from Thordon Bearings have been retrofitted to five turbines at the Son La Hydropower plant in Vietnam. Delta Marine & Industries, Thordon’s distributor in Vietnam, worked with end user Vietnam Electricity (EVN) to choose suitable replacements for the original metal polymer lined bearing. The refit included ThorPlas-Blue wicket gate and linkage bearings with washers, Thordon SXL operating ring wear pads, Thor-Flex wicket gate seals, and SXL upper and lower gate seal. The hydro turbine bearings and seals are designed to efficiently replace worn components. Johnny Dao, managing director, Delta Marine &
38 DESIGN SOLUTIONS MAY 2024
Industries, said: “Thordon’s grease-free bearing products for hydropower installation combine a very low coefficient of friction with low wear in an abrasive water environment, and high resistance to shock loading and vibration. They offer high pressure performance and resilience, as well as extremely long wear life.” It was important that the products could perform
well in the unique challenges of the application, as the high shock load of the existing wicket gates’ operating ring had destroyed the existing wear pads. The original seals had also hardened after a few years, leading to cracks and leaks. Thordon’s solution to these problems involved
using Thor-Flex and Thordon SXL for the lower and upper gate seals, and SXL for the operating ring wear pads. Thorseals were used in place of the existing rubber seals and ThorPlas-Blue for the intermediate bearing. The Son La Hydropower plant’s new bearings and pads have now been in operation for four years.
Thordon Bearings
https://thordonbearings.com
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