Product category:
Bearings
News Release from: SKF UK | Subject: Composite plain bushings
Edited by the Engineeringtalk Editorial
Team on 20 February 2002
Composite bushings give best of both
worlds
Composite plain bushings combine the load-carrying advantages of bronze bushings with a thermoplastics lining that gives a superior lower-maintenance sliding surface.
Some of the best engineering solutions come about as a result of compromise SKF's composite plain bushings combine the advantages of bronze bushings, in terms of their load-carrying characteristics, with a thermoplastics lining, that gives a superior lower-maintenance sliding surface
This article was originally published on Engineeringtalk on 1 Aug 2008 at 8.00am (UK)
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Essentially, two types of bearing are offered by SKF.
Each is constructed with a copper-plated steel backing onto which a 300mm thickness of porous sintered bronze is applied.
Embedded into the pores, and as an overlay on top, is a sliding surface of either filled polytetrafluoroethylene (PTFE) or the polyacetal resin, polyoximethalene (POM).
The former material enables the bushing to run dry.
During the running in period, a small amount of the PTFE is transferred to the counter surface, which, to an extent, fills the roughness of the shaft.
The rate of wear then diminishes, unless there is corrosion in the shaft.
No grease is used with these bushings, as it reduces the benefits of the PTFE's characteristics.
POM coated bushings require a grease, with the preferred choice being lithium soap greases without additives.
The wear behaviour of POM bushings differs significantly from that of PTFE types and in laboratory conditions no wear occurs.
The composite bushings overcome the problems of solid plastic bushings, that can swell or even cease when wetted, and bronze bushings that require regular relubrication.
Both materials are available as bushings according to DIN ISO3547 up to 300mm bore, as washers up to 52mm bore and as strips with dimensions 100 x 500mm and up to 3.06mm thick. Request a free brochure from SKF UK ...
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