Patent ID: 8221003

Claim:
A bearing unit, comprising: four rolling bearings disposed so as to be adjacent to each other in an axial direction and forming two adjacent pairs of rolling bearings, each of the four rolling bearings including an inner race and a corresponding outer race disposed coaxially with each other, and a plurality of rolling elements disposed between the inner race and the outer race with intervals in a circumferential direction; a first member, which is fitted to the inner race of each of the rolling bearings; and a second member, which includes a fitting hole into which the outer race of each of the rolling bearings is fitted, wherein the four rolling bearings are disposed in the axial direction so that the inner races or the outer races of each pair of rolling bearings are brought into contact with each other in the axial direction while the corresponding outer races or the corresponding inner races thereof are disposed with intervals in the axial direction, the inner races or the outer races of the rolling bearings at both axial ends, which are brought into contact with the inner races or the outer races of the adjacent rolling bearings, are fixed to the first member or the second member, and the inner races or the outer races of the central two rolling bearings, which are disposed with intervals in the axial direction, are disposed so as to form a radial gap between confronting surfaces of the first member and the inner races or between confronting surfaces of the second member and the outer races.