US 11,798,584 B2
Bearing device with pre-load configuration, method for producing same, and hard disk drive device
Kunihiro Tsuchiya, Gunma (JP)
Assigned to MINEBEA MITSUMI Inc., Nagano (JP)
Filed by MINEBEA MITSUMI Inc., Nagano (JP)
Filed on Mar. 29, 2022, as Appl. No. 17/656,910.
Claims priority of application No. 2021-062653 (JP), filed on Apr. 1, 2021.
Prior Publication US 2022/0319545 A1, Oct. 6, 2022
Int. Cl. G11B 5/48 (2006.01); F16C 19/54 (2006.01); F16C 25/08 (2006.01)
CPC G11B 5/4813 (2013.01) [F16C 19/54 (2013.01); F16C 25/083 (2013.01); F16C 2370/12 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A bearing device comprising:
an outer member having a tubular shape;
a shaft member held inside the outer member; and
a first bearing, a second bearing, a third bearing, and a fourth bearing, rotatably holding the shaft member with respect to the outer member and arranged in this order in an axial direction, wherein
an outer circumferential surface of an outer ring of each of the first bearing, the second bearing, the third bearing, and the fourth bearing is fixed to an inner circumferential surface of the outer member, and
a spring applying a constant pre-load is provided between inner rings of the second bearing and the third bearing.