Its a hard life but a long one for new NSK bearings
The NSK Long Life Spherical Bearing for vibrating machinery are a significant development in maximising uptime and reducing maintenance.
Even in a tough operating environment like a quarry, mine or construction site, there are some places that are tougher than others - and one is inside vibrating machinery. Some equipment might vibrate as A side-effect of its operation, but machinery such as vibrating screens are actually built to shake, and needs bearings which can take the punishment. That's why NSK has developed a new range of Long-life Vibrating Screen Spherical Roller Bearings.
By applying state-of-the-art technology to materials, lubrication, sealing and design, NSK has created a spherical roller bearing (SRB) for vibration-intensive machinery, which offers twice the service life of conventional bearings, as well as a load rating 1Ľ times higher. So users can benefit not only from cost savings on bearing replacement, but also from reduced maintenance costs, greater seizure resistance and less downtime.
The knowledge and capabilities of NSK's technology centres have been applied with great effect to developing these new bearings specifically for harsh working environments. Sophisticated analysis techniques, the latest production technology, and stringent evaluation tests have all contributed to the bearings' high performance and long life.
The bearings feature a precision-machined, tough, one-piece brass cage, with contoured roller pockets. The surface roughness on the rollers and inner and outer rings is improved over conventional bearings, to control the slippage action of the rollers, and the rollers are also specially heat-treated to prevent cracks from vibrations and shock loads. The curvature factor between the raceway and the spherical roller has also been optimised to reduce slippage and initiation stress between the roller and the contact surfaces of the outer and inner ring raceways. All these improvements help to reduce raceway damage due to surface fatigue over the life of the bearing, which is why service life is so significantly longer than with traditional SRBs.
The design of the Vibration Screen SRBs also helps to stabilise load distribution, by controlling radial internal clearance and bearing dimensional tolerance factors. The internal radial clearance is set at two-thirds of ISO standard bearings, and the outer diameter and bore diameter tolerances are half that of ISO standard bearings.
With the need for continuous operation 24 hours a day, 6,000 hours a year, and failure of even a single component not an option when it can have a major impact on the entire mining or quarrying operation, the new NSK Long-Life Spherical Roller Bearings for Vibrating Machinery are a significant development in maximising uptime, reducing maintenance and improving productivity.
The bearings are available from ERIKS in twenty-two sizes, with outer diameters ranging from 90-400mm, and bore diameters from 40-190mm.