Patent ID: 7811000

Claim:
A rolling bearing device adapted for supporting a pinion shaft provided with a pinion gear at one end thereof, comprising: a case storing oil therein in which the pinion gear is housed; and a double row angular contact ball bearing attached on the case and provided with at least two rows of balls between inner and outer rings for supporting a part of the pinion shaft, a first row of balls disposed at a region near to the pinion gear, and a second row of balls disposed at a region remote from the pinion gear, the first row of balls comprising a pitch circle diameter greater than a pitch circle diameter of the second row of balls, and the first row of balls comprising contact angles which are in a same direction as contact angles of the second row of balls; wherein a bearing internal space is divided into a first bearing internal space containing the first row of balls and open toward the pinion gear and a second bearing internal space containing the second row of balls, the second bearing internal space being sealed by a partition wall of a plurality of partition walls, formed by a bearing seal and disposed on one side of the second row of balls between the first row of balls and the second row of balls, and an other partition wall of the plurality of partition walls, formed by an other bearing seal and on an other side of the second row of balls, such that lubricating grease is sealed in the second bearing internal space.