Patent ID: 8517611
Filing Date: 2013-08-27
Classification: F16C,G11B,H02K

Abstract:
1. A bearing apparatus comprising: a stationary portion including: a rotating portion arranged to rotate about the stationary shaft; and a lubricating oil; wherein the circular plate portion and the cylindrical portion together define a first cup portion; the rotating portion includes: the lubricating oil is arranged in a gap between the stationary and rotating portions; at least one of the outer circumferential surface of the stationary shaft and the first inner circumferential surface of the rotating portion includes a radial dynamic pressure groove array arranged thereon; an upper surface of the lubricating oil is located between the outer circumferential surface of the first cup portion and the second inner circumferential surface of the rotating portion; a lower surface of the lubricating oil is located between the stationary and rotating portions at a location axially lower than a location of the annular recessed portion; the rotating portion further includes a through hole extending therethrough from an upper surface to a lower surface thereof, and filled with the lubricating oil; and one of the first cup portion and the rotating portion includes a pumping groove array arranged thereon to cause the lubricating oil to flow toward one end of the through hole during rotation of the rotating portion.