Bearing life extended by threefold under conditions of water infiltration and power debris (iron oxide) contamination.

Features:

1. Crack generation is restricted through the use ultrahigh cleanliness technology for the bearing steel as a measure against water infiltration.
2. Chemical components of the bearing steel have been optimized in order to strengthen the grain boundary as a measure against cracks generating along the grain boundary.
3. TF technology has been applied to the bearing steel in order to enhance service life under conditions of contaminated lubrication.