Motor including rotor hub with recessed portion and disk drive apparatus including the same

摘要

A rotating portion of a motor includes a hub body portion and a shaft arranged to extend in an axial direction. The hub body portion includes a through hole and a recessed portion. The recessed portion extends radially outward from an outside surface of the shaft, has an annular shape and is recessed axially downward. The recessed portion includes first, second, and third ridge portions. The first ridge portion is an axially upper edge of an inside surface defining the through hole, the second ridge portion is arranged radially outward of the first ridge portion, and the third ridge portion is arranged radially outward of the second ridge portion, and is located axially above both the first ridge portion and the second ridge portion. An adhesive is arranged to cover the outside surface of the shaft and reach a portion of the second ridge portion.

主权项

1. A motor comprising:
a stationary portion; and a rotating portion arranged to rotate about a central axis relative to the stationary portion; wherein the rotating portion includes:
a disk-shaped or substantially disk-shaped hub body portion; anda shaft arranged to extend in an axial direction; the hub body portion includes:
a hub through hole arranged to pass through the hub body portion and to have the shaft fixed therein; anda hub recessed portion arranged to extend radially outward from an outside surface of the shaft to define an annular or substantially annular shape and to be recessed axially downward; the hub recessed portion includes:
a first ridge portion being an axially upper edge of an inside surface defining the hub through hole;an annular or substantially annular second ridge portion arranged radially outward of the first ridge portion;an annular or substantially annular third ridge portion arranged radially outward of the second ridge portion, and located axially above both the first ridge portion and the second ridge portion; andan adhesive arranged to cover a boundary between the first ridge portion and the outside surface of the shaft throughout an entire circumferential extent thereof; wherein the adhesive is arranged to cover the outside surface of the shaft and reach at least a portion of the second ridge portion.