Hybrid bearings insulate against stray electric currents SKF® hybrid bearings with silicon nitride rolling elements and steel rings provide insulation against stray currents in large variable speed electric motors to eliminate electric arc bearing damage and resulting premature bearing failure. The ceramic rolling elements further make these bearings lighter, harder, and more durable alternatives to conventional all-steel counterparts. In addition to their insulating properties, silicon nitride balls are 40% less dense than steel balls, which reduces centrifugal force and friction to promote faster, cooler running and longer service and lubricant life; harder than steel for enhanced wear resistance against hard particles, contaminants, and vibration; and highly inelastic for increased bearing stiffness and reduced deflection under load to promote reliable performance. Silicon nitride balls also experience less wear and provide better bearing service life under poor lubrication conditions compared with conventional steel bearings. Standard types include hybrid single row deep groove ball bearings with bore diameters from 5mm to 110mm; sealed and greased-for-intended life ball bearings protected by steel-reinforced synthetic rubber seals and filled with premium lubricant; and open basic design bearings available without seals. Cages are glass fiber-reinforced polyamide or pressed steel, depending on bore size. Customized hybrid bearing versions can be developed to satisfy particular application requirements. Contact SKF USA Inc., 800-440-4SKF (toll-free). www.skfusa.com
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