Low Friction Bearings

 

          NSK Develops Ultra Low-Friction Sealed Clean Ball Bearings for Transmissions NSK Ltd. announced today that it has developed ultra low-friction sealed clean ball bearings with half the friction of conventional sealed ball bearings. NSK will aggressively market this product for manual transmission (MT) vehicle applications. Manual transmissions have increased demand in emerging markets and Europe.  They can also be used for dual clutch transmissions (DCT), a popular transmission in Europe that combines fuel efficiency with a sporty feel.  NSK sales for this product are targeted to exceed 1.5 billion yen by 2015.

 

           NSK clean bearing seals are used inside transmissions to inhibit the ingress of gear dust and other contaminants. These sealed clean ball bearings have shown to provide drastically longer service life and superior reliability and have been adopted by major auto makers around the world since their release.

 

           In recent years, rising environmental awareness has created demand for automobile transmissions that do more to improve fuel economy, which has in turn created expectations for reduced friction in transmission bearings. NSK’s newly developed ultra low-friction sealed clean ball bearings cut friction to half the conventional level, thanks to the product features detailed below.

 

          NSK has based the new lineup on ball bearings already in production at its many ball bearing manufacturing sites around the world.   This will insure increased speed to market and the latest technology available globally.
 
Product features

1. Lower torque

Straining force was reduced by 50% by narrowing the seal lip by 10% and lengthening it by 70% compared to usual bearings, based on computer simulations of the lip shape. This enabled the creation of ball bearings with the lowest friction in the world—half the conventional level.

 

2. Same durability as conventional products

The seal lip shape was improved based on computer analysis. The new shape improves lip-following and stabilizes contact pressure along the edge, while reducing straining force; this made it possible to realize the same durability as conventional products by preventing the ingress of contaminants from the transmission oil into the bearing.
 
           NSK has achieved compact, lightweight and low torque applications for automobiles by leveraging its four core technologies (tribology, materials, analysis, and mechatronics). The company has been developing these technologies for over 90 years, and is continuing to create products that will improve the fuel efficiency of automobiles. Next, NSK will take on the challenge of even further reducing overall friction in transmissions.