Patent ID: 8879201
Filing Date: 2014-11-04
Classification: F16C,G11B,H02K

Abstract:
1. A spindle motor for use in a disk drive apparatus to drive a disk, the disk drive apparatus including a housing defining an interior space, the spindle motor comprising: a stationary portion including a shaft arranged to extend in an axial direction; a base portion arranged to define a portion of the housing, and including a through hole in which the shaft is inserted; and a rotating portion arranged to rotate about a central axis with respect to the stationary portion; wherein the base portion includes an inner circumferential portion arranged to define the through hole, the inner circumferential portion and a lower portion of the shaft defining a fixing region therebetween; the fixing region includes a press-fitting region and an adhesion region defined on a lower side of the press-fitting region and in which a seal gap is defined between the inner circumferential portion of the base portion and the lower portion of the shaft; the seal gap includes an adhesive arranged therein over an entire circumference thereof; an increased-width gap portion is defined at a boundary between the seal gap and the press-fitting region or in a portion of the seal gap which is in a vicinity of the press-fitting region, the increased-width gap portion having an increased radial width and extending over an entire circumference; and a communicating channel is defined within the base portion or between the lower portion of the shaft and the inner circumferential portion of the base portion to connect the increased-width gap portion with a space defined on an upper side of an upper surface of the base portion.