BEARING MECHANISM, MOTOR, AND DISK DRIVE DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a bearing mechanism capable of discharging bubbles through a tapered clearance by feeding lubricating oil from an opening of a communicating channel to a thrust clearance. SOLUTION: The bearing mechanism 4 includes: a shaft 41; a sleeve 5; a thrust portion 42; and a cover 44. Lubricating oil is arranged in a communicating channel 55 communicating with the sleeve 5 in the vertical direction, a thrust gap 81, and a gap between the thrust 42 and the cover 44. An opening 551 of the communicating channel 55 is formed at an outer circumferential part of a lower surface of the sleeve 5 radially outward of the thrust gap 81. A radially outermost part of the thrust portion 42 is arranged either tangent to the inside surface of the communicating channel 55 or positioned at the center shaft side. A tapered gap 83 is arranged between the thrust portion 42 and the cover 44 on the center shaft side, and a guide gap leading the lubricating oil 46 to the thrust gap 81 in a direction directing from the opening 551 to the tapered gap 83 is arranged between the outer circumferential part and the cover 44. COPYRIGHT: (C)2011,JPO&INPIT