Patent ID: 8567067
Filing Date: 2013-10-29
Classification: F16C,G11B,H02K,Y10T

Abstract:
1. A method of manufacturing a fluid dynamic bearing mechanism for use in a motor, the fluid dynamic bearing mechanism including: a shaft portion including a central axis extending in a vertical direction as a center thereof; an upper thrust portion arranged to extend radially outward from an upper portion of the shaft portion; a lower plate portion arranged to extend radially outward from a lower portion of the shaft portion; a tubular portion arranged to extend axially upward from an outer edge portion of the lower plate portion; a sleeve portion arranged opposite to each of an outer circumferential surface of the shaft portion, a lower surface of the upper thrust portion, and an upper surface of the lower plate portion with a gap intervening therebetween, and including a communicating hole arranged to extend through the sleeve portion from an upper surface to a lower surface of the sleeve portion; an upper hub annular portion arranged above an outer edge portion of the sleeve portion; and a lubricating oil; wherein the upper thrust portion and the upper hub annular portion are arranged to together define an upper seal gap therebetween; the sleeve portion and the tubular portion are arranged to together define a lower seal gap therebetween, the lower seal gap being in communication with a vicinity of a lower end opening of the communicating hole; the communicating hole and a space extending from the upper seal gap to the lower seal gap through the gap intervening between the sleeve portion and the lower surface of the upper thrust portion, the gap intervening between the sleeve portion and the outer circumferential surface of the shaft portion, and the gap intervening between the sleeve portion and the upper surface of the lower plate portion being continuously filled with the lubricating oil; the method comprising the steps of: