New heavy-duty cylindrical roller bearings from Schaeffler
High dynamic load capacity and double the operating life for industrial gearboxes and construction machinery
SCHAEFFLER have introduced the new NJ23-ILR series of rolling bearings for heavy-duty industrial gearboxes and construction machinery. Compact in design, the bearings are equipped with the high-performance MPAX cage, and have a very high dynamic load capacity.
With the load rating having been increased by an average of 24%, thus doubling the operating life compared with the NJ23 basic type, users from the industrial and off-road segments now have a sustainable, reliable, and convenient-to-use rolling bearing solution for highly loaded shafts. According to Schaeffler, they perform better than commonly available bearings of the same basic type, even under mixed friction conditions due to insufficient lubrication.
Traditionally, rolling bearings for heavy-duty industrial gearboxes and construction machinery have to withstand very high radial loads and also be capable of supporting axial forces on one side, but recent times have seen a further significant increase in requirements. The highly loaded bearing positions on high-speed shafts and intermediate shafts in gearboxes now also require ever-increasing basic dynamic load ratings, as do the high acceleration forces in vibratory machinery.
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 also make a convincing case through their high level of durability and combine economic efficiency with environmental and climate protection. What is required are compact and extremely robust rolling bearings, which excel due to an above-average operating life, ease of implementation, and replacement in a restricted space.
‘Our new cylindrical roller bearing series was specifically adapted to match these increased performance requirements through optimizations in the selection of materials, design, surface quality, and heat treatment,’ said Sebastian Pfeuffer, product manager for cylindrical roller bearings at Schaeffler.
‘The high-performance MPAX cage with its proven strength characteristics also stands for far above average load carrying capacity and has proved to be extremely robust in high-vibration applications. The rings and rollers can also be supplied with a Durotect-B coating to provide increased anti-wear protection.’
The new NJ23-ILR cylindrical roller bearings are available from the first quarter of 2024 with bore codes 16 to 44 and from the fourth quarter of 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.
