Patent ID: 8958174
Filing Date: 2015-02-17
Classification: F16C,G11B,H02K

Abstract:
1. A spindle motor comprising: a stationary portion that includes a stator; and a rotating portion that includes a rotor magnet and is rotatably supported via a lubricant by the stationary portion, wherein the stationary portion further includes a sleeve portion that is positioned on a radially outer side of a shaft, and a seal cap that includes an inner circumferential surface which defines a hole through which the shaft passes and covers at least an upper surface of the sleeve portion, the rotating portion further includes a shaft, an outer circumferential surface of the shaft and an inner circumferential surface of the sleeve portion face each other with the lubricant arranged therebetween, and at least a portion of the outer circumferential surface of the shaft or the inner circumferential surface of the sleeve portion defines a bearing portion, the stationary portion further includes a first capillary seal portion that is positioned on a radially outer side of the bearing portion, and a second capillary seal portion that is positioned on a further upper side than the bearing portion and on a further radially inner side than the first capillary seal portion, the lubricant is continuously interposed in the bearing portion, the first capillary seal portion, and the second capillary seal portion, the seal cap covers a portion of an opening of the first capillary seal portion and a portion of an opening of the second capillary seal portion, wherein a maximum width of a first gap between the outer circumferential surface of the shaft and the inner circumferential surface of the seal cap in a radial direction is smaller than a maximum width of the opening of the first capillary seal portion, and a maximum width of a second gap between the upper surface of the sleeve portion and a lower surface of the seal cap in an axial direction is smaller than a maximum width of the opening of the first capillary seal portion.