Product category:
Bearings and guideways - rotary and linear
News Release from: NSK UK | Subject: SPACEA bearings
Edited by the Manufacturingtalk Editorial
Team on 03 October 2002
Bearing design withstands high
temperatures
A patented bearing design is redefining the operating parameters for high temperature bearings in all areas of manufacturing and processing technology.
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 400degC 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, non- magnetic, corrosive, high/low temperature, nuclear and high speed Central to the high temperature performance of 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 article was originally published on Manufacturingtalk on 30 Apr 2004 at 8.00am (UK)
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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.
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The increasingly stringent demands made upon the food processing industry as a result of recent 'food scares' have put bearings very much in the 'front line' says NSK.
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.
The continuous drive to improve technology in all areas of manufacturing, processing, communications, power generation and transport is placing increasing demands upon bearings to operate in special environments and under adverse conditions.
NSK is meeting these requirements with the SPACEA series.
SPACEA bearings achieve this wide range of technical requirements with a programme of high performance materials, surface finishes and specially developed lubricants, including solid types.
SPACEA bearings can be manufactured from martensitic and austenitic stainless steels for corrosive environments, ceramics or a combination of both.
Hybrid SPACEA types can have any combination of ceramic inner rings, outer rings or balls, however, the range also includes all ceramic bearings for use in highly corrosive and high temperature environments. Request a free brochure from NSK UK ...
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