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Concentric bearing lock
By John Lewis, Technical Editor -- Design News, June 17, 2002
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Tightening set screws drives the inner ring up the inclined planes on the sleeve, providing a tight, concentric fit on the shaft. Prior to installation, inclined planes on the unit's inner ring bore and sleeve are positioned to provide clearance around the shaft. |
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Conventional air-handling bearing units typically contact the shaft in only three places, off-setting the shaft's centerline from that of the bearing unit. Having only three contact points concentrates loads, galls the shaft surface, and leads to fretting corrosion.
Concentric locking technology, a patent-pending bearing mounting and locking system, uses the wedging action of inclined planes to provide a near 360° interference fit, and does not offset the centerline of the shaft.
Tightening the setscrews forces inclined planes on the bore of the inner ring to move up a series of inclined planes on the sleeve. The resulting wedging action compresses the sleeve for a tight and concentric fit.
The system allows for use of commercial grade shafting and is said to save money on assembly time and tools. Other benefits include reduced noise, vibration, fretting corrosion, maintenance, and dependence on close shaft tolerances; and longer life.
Dan Korona, SKF USA Inc., A1510 Gehman Rd., Kulpsville, PA 19443; Tel: (215) 513-4873; Fax: (215) 513-4475; E-mail: dan.n.korona@skf.com.
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Submit your ideas and rough drawings for this section to John Lewis, Designer's Corner, Design News, 275 Washington St., Newton, MA 02458
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