01 June 2010
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Improved bearing seals offer quieter running in long life assemblies

NSK has improved sealing and life performance across its complete range of RHP Self-Lube mounted bearing units with the introduction of its robust S-design seal on all inserts with diameters up to a maximum of 100mm.

Previously the S-design seal was only available only on Self-Lube units up to 45mm bore. The introduction of the seal across the entire expands the range of options available with the bearings and offers the advantages of greater robustness and lower torque operation. It comprises a strong steel former, which is firmly secured in the outer ring of the bearing, allied with a flexible nitrile rubber sealing lip that contacts with the fine-ground finish of the inner ring to give low friction performance and improved sealing capability.

And for more hostile environments, the Flinger seal provides increased levels of protection without any loss of rated bearing speed due to its non-contacting lip. It provides a first line barrier against contamination and thus improves bearing life. In the most arduous environments triple lip seals are fitted to protect the bearing and extend its life. The Triple Lip Seal offers the highest levels of protection with three sealing lips which contact the bearing inner ring.

The sealing efficiency and low friction operation of all Self-Lube sealing options is greatly enhanced by NSK's initiative in super-finishing the raceways on all Self- Lube inserts. This means that the bearings will run quieter in operation, and that the lifetime of the bearings under marginal lubrication conditions is increased.

Author
Paul Gay

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