Product category:
Bearings
News Release from: NSK UK | Subject: SJ Series
Edited by the Engineeringtalk Editorial
Team on 25 September 2002
Hot stuff for novel bearing design
A new, patent-pending bearing design provides outstanding levels of performance in normal atmospheric and vacuum environments at temperatures up to 400C.
NSK is redefining the operating parameters for high-temperature bearings in all areas of manufacturing and processing technology with a new, patent-pending bearing design that provides outstanding levels of performance in normal atmospheric and vacuum environments at temperatures up to 400C The new SJ bearings are the latest addition to NSK's Spacea series, a unique range of bearings and lubricants that provide high performance and reliability under all types of demanding operating conditions: super-clean, vacuum, nonmagnetic, corrosive, high/low temperature, nuclear and high speed
This article was originally published on Engineeringtalk on 12 May 2000 at 8.00am (UK)
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Central to the high-temperature performance of the SJ Series is a patent pending design, integrating a special cage pocket containing a solid lubricant spacer joint positioned between two specially treated balls.
This arrangement, resembling a peapod, overcomes the problems of high temperature environments as encountered in kilns, vacuum deposition equipment, and on heat treatment conveyors, with the added benefits of extended maintenance-free performance and longer operating life.
The longer life performance of the bearings is achieved due to the steady supply of lubricant - a sintered molybdenum disulphide material, provided by the spacer joint.
This ensures added durability in high temperature atmospheric conditions - up to six times longer compared to bearings using solid lubricant paste.
In addition, the lubricant demonstrates minimal outgassing performance, eliminating concerns over production pollution when the bearings are used in vacuum environments.
Equally important for the SJ bearings groundbreaking levels of performance, is a materials specification that employs martensitic stainless or bearing steel for bearing inner rings, outer rings and balls (the latter can also be ceramic for added durability), and austenitic stainless or cold rolled steel for the special pressed cages used in the bearings.
The balls are one element in a two-part synergy designed to ensure excellent torque stability from the SJ series bearings over extended operating periods.
They are coated with the same molybdenum disulphide material used for the spacer joints.
This results in a symbiosis, in which both balls and spacer combine to achieve torque stability exceeding that of conventional silver coated bearings, even under demanding vacuum conditions. Request a free brochure from NSK UK ...
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