The bearing device contains two rolling bearings installed on a shaft 9 and a preload is applied to the inner ring of the rolling bearings. The respective dimension for the two rolling bearing inner rings is shortened on both sides in the orientation of the width dimensions of the inner ring, centered on the grooves for the inner ring, with each being set smaller than the dimension of the outer rings. The difference in dimensions is double the difference in the dimensions capable of eliminating rattling of the rolling bearings, when a preload is applied to the outer edge of the inner ring. The outer rings and races are respectively formed to be in a position at half the width dimension of the inner ring from the outer edges of the two outer rings for the two rolling bearings.
1. A bearing device having a shaft, comprising:
two rolling bearings mounted on said shaft, each of said rolling bearings further comprising an outer ring, having an outer ring groove, and an inner ring,
wherein said outer ring groove is centered at a position equal to half of a width of said inner ring from an outer edge of said outer ring, wherein the width of said inner ring is smaller than a width of said outer ring, and wherein the difference between the width of the outer ring and the width of the inner ring is double a difference in width thereby eliminating rattling of said rolling bearings when preload is applied.
2. The bearing device according to claim 1 , wherein said inner ring further comprises an inner ring groove.
3. The bearing device according to claim 2 further comprising a plurality of rolling elements disposed between said outer ring groove and said inner ring grove of each said rolling bearing.