GREASE-ENCLOSED ROLL BEARING

摘要

PROBLEM TO BE SOLVED: To provide a grease-enclosed roll bearing revolvable stably at low torque without scattering the grease enclosed therein under high-speed revolution and having such excellent acoustic characteristics as to be revolvable for a long time with low noise. SOLUTION: This roll bearing is such as to be enclosed with a lubricating grease; wherein the lubricating grease is such as to be prepared by formulating a base oil, an ester oil 30-70 mm2/s in dynamic viscosity at 40 deg.C and 8.3-9.0 in solubility parameter, with a thickening agent such as a 12-24C fatty acid lithium salt to adjust the worked penetration (JIS K2220) to 175-250, and the grease thus prepared is enclosed at 5-20% of the space volume inside the roll bearing.