NSK Develops Ultra High-Speed Large-Diameter Ball Bearings for Motors in Hybrid Cars

NSK Ltd. (NSK; Headquarters: Tokyo, Japan; President and CEO: Norio Otsuka) today announced that it has developed large-diameter bearings for motors that are capable of ultra high-speed rotation exceeding two million dmn*1. The new products deliver the fastest*2 rotation speeds of any other ball bearing used for automotive applications, and can be utilized in ultra high-speed motors to help improve fuel economy and driving performance. NSK is targeting annual net sales of ¥3.5 billion of the products by 2015.

*1 dmn: Bearing diameter × Maximum rotating speed

*2 According to our own research, as of July 2011

There is an increasing diversity of hybrid systems aimed at delivering better fuel efficiency and higher motor power output for driving. For hybrid car motors, there is increasing demand for larger diameter bearings, as motors increase in size and with the development of ultra high-speed motors that deliver higher power output.

The large-diameter ball bearings for hybrid car motors have an inner diameter of 160 mm and outer diameter of 190 mm, yet in spite of their size are capable of ultra high-speed rotation exceeding two million dmn, faster than any other ball bearing used for automotive applications.

The new ball bearings will help to improve the fuel efficiency and driving performance of hybrid cars, by enabling drive motors and generators that enhance power output and fuel efficiency in hybrid cars.


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