Bearing mechanism and blower fan

A bearing mechanism comprising:

• a shaft arranged to have a central axis extending in a vertical direction as a center thereof;
• a sleeve in which the shaft is inserted;
• a plate portion in a shape of a disk, arranged to extend radially outward from a lower end of the shaft, arranged opposite to a lower surface of the sleeve, and arranged to have a diameter smaller than that of the lower surface of the sleeve;
• a sleeve housing inside which the sleeve and the plate portion are arranged;
• an adhesive arranged to adhere the sleeve and the sleeve housing to each other;
• and
• a lubricating oil;
• wherein
• the sleeve housing includes:
• a cylindrical portion arranged to cover outer circumferences of the sleeve and the plate portion;
• and
• a bottom portion arranged to close a lower portion of the cylindrical portion;
• the bottom portion includes a plurality of projecting portions arranged in a circumferential direction in an upper surface of the bottom portion, each projecting portion being arranged to project upward to be in contact with the lower surface of the sleeve;
• each of the projecting portions and the plate portion are arranged radially opposite each other;
• at least a portion of the adhesive is arranged to exist between an outer circumferential surface of the sleeve and an inner circumferential surface of the cylindrical portion;
• the lubricating oil is arranged to exist continuously in a gap between a portion including the sleeve and the sleeve housing and a portion including the shaft and the plate portion;
• and
• the shaft and the sleeve are arranged to have a radial dynamic pressure bearing portion defined therebetween.