Product category:
Bearings
News Release from: NSK UK | Subject: HPS spherical roller bearings
Edited by the Engineeringtalk Editorial
Team on 07 March 2006
Spherical roller bearings have double
running life
Spherical roller bearings claimed to have twice the running life of conventional bearings of the same size, and a maximum limiting running speed that has been improved by up to 20%.
NSK has developed the HPS series of spherical roller bearings for various industrial needs They are claimed to have twice the running life of conventional bearings of the same size, and a maximum limiting running speed that has been improved by up to 20%
This article was originally published on Engineeringtalk on 4 Jul 2008 at 8.00am (UK)
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The bearings have a high load capacity and self-aligning feature that allows for some misalignment of the axis of rotation.
The unitised design of the bearings enables easy handling and installation, making them popular across industries such as steel, pulp and paper, transportation, extraction and construction, which require durability and smooth running.
Key to the self-aligning performance is the spherical profile of the bearing rollers acting in the bearing inner and outer ring raceways.
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The guide provides replacement part numbers for metric bearings in bore diameters from 2 to 220mm and imperial sizes from 1/8in bore to 57.15in.
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NSK's Silver-Lube bearings are designed specially for use in industries where hygiene considerations and corrosion and chemical resistance are important.
Under rotation these geometrical forms interact to produce slippage at the contact surface points between the raceways and rollers.
With this design, NSK has identified the mechanism that causes slippage and creates high friction on the surface, leading eventually to damage due to surface fatigue.
The firm verified by theoretical analysis and bench testing that the friction can be reduced by controlling the motion of rotating rollers; and that a special surface treatment of the outer ring is effective in achieving this.
Based on these findings, NSK developed mass-production technology and bearings, which can reduce slippage to prolong running life by more than twice that of conventional products.
The cage of a spherical roller bearing is also important as it must have high dimensional accuracy and functionality.
NSK applied a nitriding surface treatment to the high-precision pressed steel cage.
This can significantly reduce wear in harsh operating environments.
Compared with usual nitriding, this treatment forms a finer and harder surface with more uniform hardness.
Since the treatment is conducted at high temperatures, the dimensional accuracy of the cage is affected.
The firm solved this problem with a way to ensure high accuracy of the cage after treatment.
As a result, the problem of cage wear under conditions of continuous running at high speeds, which restricted any increase of the limiting speed of the bearing, has been solved.
This is evidenced by the 20% increase in limiting speed achieved by the design.
Initially, 42 sizes with outside diameters from 80 to 260mm will be marketed globally. Request a free brochure from NSK UK ...
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