Patent ID: 8670209
Filing Date: 2014-03-11
Classification: F16C,G11B,H02K

Abstract:
1. A spindle motor comprising: a rotating portion including a rotor magnet; and a stationary portion including a stator facing the rotor magnet; wherein the stationary portion includes: the rotating portion includes a sleeve portion disposed between the upper plate portion and the lower plate portion; the shaft component includes: lubricating oil is continuously present within an upper thrust gap between the sleeve portion and the upper plate portion, a radial gap between the sleeve portion and the outer shaft portion, and a lower thrust gap between the sleeve portion and the lower plate portion; in a region more radially outward than the radial gap, an upper seal portion is located between the stationary portion and the rotating portion, and an interface of the lubricating oil is located in the upper seal portion; in the region more radially outward than the radial gap, a lower seal portion is located between the stationary portion and the rotating portion, and the interface of the lubricating oil is located in the lower seal portion; in the lower thrust gap, a lower thrust dynamic pressure generating groove array is arranged on at least one of a lower surface of the sleeve portion and an upper surface of the lower plate portion; and in the radial gap, a radial dynamic pressure generating groove array is located on at least one of an inner circumferential surface of the sleeve portion and an outer circumferential surface of the outer shaft portion.