NSK’s spherical roller bearings offer solutions for demanding operating conditions that include constant vibration, heat, and shock loads in heavy industries such as quarrying and mining, steel and metals, and papermaking by reducing maintenance requirements and lowering total cost of ownership.
The NSKHPS (High Performance Standard) series maintains dimensional stability in high temperature environments and can support high radial loads and moderate axial loads. The performance enhancements of these bearings include tight radial clearance tolerance, extra precision on the bore and outside diameter, and super-finished, heat-treated rollers with superior shock load capacity. They offer 20% higher speed capability and a standard thermal stabilisation temperature of 200°C and can therefore be used in applications such as rolling mills, steel plant walking beams and recirculation fans on ore preparation machinery.
SK’s spherical roller bearings, available in many special designs and technical solutions, resist seizure and wear in demanding operating conditions that include constant vibration, heat, and shock loads. Image credit: NSK South Africa (Pty) Ltd
The range
The range includes vibration screen, sealed clean, moulded-oil, detachable seal, triple ring, quiet and low vibration, and ultra-large split variants:
The vibration screen spherical roller is used in the vibrating machinery to separate ore and minerals at mining facilities a longer service life due to a surface created on the raceway of the outer ring, which controls the slippage action of the rollers.
The sealed-clean series is equipped with spring-loaded nitrile rubber seals that have a peripheral bead to stop them separating from the bearing in steelmaking equipment. In addition to keeping contaminants out, the seals facilitate the equally important function of keeping lubricant in.
The moulded-oil range features lubricated, oil-impregnated material, providing an optimum solution for corrosive and dust-contaminated environments. Whilst the detachable seal series achieves excellent sealing in harsh conditions such as those found in quarrying and mining. The triple ring range used in the papermaking sector to support variable crowned press rolls on the drive side, where bearing load distribution is important.
The ultra-large split series allows end users to save days’ worth of maintenance time when replacing the bearings in a steel plant converter. The company’s quiet and low-vibration range assists in reducing noise levels, which is a particular advantage in high-speed elevator applications.
The SWR (Super Wear Resistant) series uses a steel composition with carefully controlled levels of retained austenite and patented heat treatment. SWR bearings are for applications in the steel industry, where users enjoy benefits that include enhanced wear resistance, longer service life and improved toughness of the outer ring core.
NSK also offers TL (tough and long life) bearings, which have proven their capability in the papermaking industry, particularly in elevated-temperature machine sections like the dryer rolls. The unique attributes of TL bearings include greater resistance to hoop stress, subsequently reducing inner ring fractures and delivering service life more than twice that of conventional bearings featuring standard heat treatment.
The recently launched ECA series features a patented cage design offering greater productivity, reliability, and load capacity. The optimised cage reduces internal stress and eliminates the need for a guide ring, thus offering benefits when deployed in steelmaking and mining machinery.