Patent ID: 8403110

Claim:
A rolling bearing device comprising: a fixed ring provided as an outer ring; a rolling ring provided as an inner ring including a raceway surface formed thereon and a first end and a second end opposite to the first end in an axial direction of the rolling bearing device, the rolling ring including a first portion closer to the first end than a portion of the raceway surface closest to the first end in the axial direction and the second portion closer to the second end than a portion of the raceway surface closest to the second end in the axial direction, a diameter of the first portion being smaller than a diameter of the second portion; a rolling element; a cage; a tank for storing lubricating oil; a pump for sucking and discharging the lubricating oil out of the tank; a nozzle including a lubricating oil outlet communicating with a discharging port of the pump to supply the lubricating oil discharged from the pump to a rolling bearing, the lubricating oil outlet being opened in an annular-shaped space between the cage and the first portion of the rolling ring of the rolling bearing so as to overlap the first portion in the axial direction; and a driving circuit including a power supply for the pump, wherein the pump and the nozzle are disposed outside of the rolling bearing and are incorporated in the vicinity of the rolling bearing in a housing in which the rolling bearing is accommodated.