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NTN Develops 'Super Low Friction Hub Bearing'
 

Tokyo, Dec 4, 2013 (JCN) - NTN Corporation has developed the "Super Low Friction Hub Bearing" with 33% lower rotational friction that contributes to an improved vehicle fuel efficiency of approx 0.28% and lower CO2 emissions of automobiles.

An increase in fuel efficient vehicles such as clean diesels and hybrid models in recent years has led to demand for greater reduction in rotational friction in hub bearings that support vehicle axles as a means of improving fuel efficiency.

NTN developed a long-life, high-rigidity low friction hub bearing (hereafter, conventional product) in 2009 that reduced rotational friction by 15% without affecting muddy water resistance. This was achieved by optimizing the internal specifications of the bearing and using an optimally shaped seals.

Today, a thickener added to the packing grease and readjusted base oil viscosity has drastically reduced stirring resistance of the grease when the bearing is rotating with the "Super Low Friction Hub Bearing".

A special surfacing coating has also been applied to the seals, and minute dimples implemented into the lip sliding surface to reduce the contact surface of the rotating outer ring, while the application of a low-viscosity grease specially developed for the lip surface has reduced the wear resistance of seal contact areas.

By Saroj Shrestha Staff Writer

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