Ntn Corporation

Takashi Yasunishi

Masaki Egami

Hidenobu Mikami

Yoshinobu Akamatsu

Koya Ohira

Rolling bearings are proposed in which acoustic deterioration is suppressed which maintaining low dust, low torque and long life. Also, a grease for rolling bearings is proposed which is less likely to scatter under centrifugal force at high speed rotation, whereby preventing malfunction and noise of electronic information devices. A lubricating oil film of an ester-series oil having a dynamic viscosity at 40&deg; C. of 35 mm /s or over is formed on the friction surface of a rolling bearing. There is also provided a high-speed rolling bearing in which a lubricating grease having its worked penetration (JIS K2220) adjusted to 175-250 is retained therein. The grease is preferably prepared by adding a thickening agent containing 50 wt % or more of an aliphatic lithium salt 12-24 in carbon number to a base oil comprising 30 wt % or more of an ester oil having a dynamic viscosity at 40&deg; C. of 10 mm /s or over, and having its worked penetration (JIS K2220) adjusted to 175-250.

Growing community of inventors

Mie, Japan

Takashi Yasunishi