Bearing with grease pockets, bearing device with plural bearings, and recording device equipped with bearing device

摘要

A bearing device has two or more bearings each having an inner ring and an outer ring disposed on the same axis. A ring-shaped holder is disposed between the inner ring and the outer ring and has circumferentially spaced-apart rolling element pockets with a concave grease pocket between each two adjacent rolling element pockets. Rolling elements are disposed in a rollable manner in respective ones of the rolling element pockets and a grease is stored in the grease pockets, the grease serving as a lubricant of the rolling element. The grease consists of at least a base oil comprised of aromatic carbon and a thickener, the content of the aromatic hydrocarbon being 70 weight % or more of the grease.

主权项

1. A bearing for use in a hard disk having a magnetic disk having a fluorine-based lubrication film on a surface thereof, the bearing comprising:
an outer ring; an inner ring disposed inside the outer ring and spaced therefrom to define therebetween an annular space; a ring-shaped holder disposed in the annular space, the holder having circumferentially spaced-apart rolling element pockets and a grease pocket between each two adjacent rolling element pockets; rolling elements disposed in a rollable manner in respective ones of the rolling element pockets between the inner and outer rings; and a grease stored in the grease pockets, the grease having a base oil having an aromatic hydrocarbon, and the grease containing 70% or more by weight of the aromatic hydrocarbon.