Patent ID: 9194434
Filing Date: 2015-11-24
Classification: F16C,G11B,H02K

Abstract:
1. A spindle motor for use in a disk drive apparatus configured to rotate a disk including a circular hole at a center thereof in a case including a base plate and a top cover arranged to cover an upper side of the base plate, the spindle motor comprising: a stationary portion; a rotating portion configured to be rotatable about a central axis extending in a vertical direction; a fluid dynamic bearing including a lubricant oil, and arranged to support the rotating portion; and a seal portion connected with the fluid dynamic bearing, and including a liquid surface of the lubricant oil located therein; wherein the stationary portion includes: the rotating portion includes: the rotating portion body includes: an annular space is intervening between the top cover and the rotating portion body inside the case; the annular space is in communication with both the first disk support surface and the liquid surface; the rotating portion body further includes at least one air hole including an upper opening in communication with the annular space, and a lower opening in communication with the gap; and the upper opening is located radially outward of the liquid surface and radially inward of the first disk support surface.