MOTOR AND DISK DRIVE APPARATUS

摘要

A motor includes a shaft component, an upper plate portion, a lower plate portion, and a sleeve portion. The shaft component includes an inner shaft portion and an outer shaft portion. The sleeve portion is disposed between the upper plate portion and the lower plate portion. A radial gap is defined between the sleeve portion and the outer shaft portion. A fixing range in which the outer shaft portion and the inner shaft portion radially overlap is provided. At least a portion in an axial direction of the fixing range radially overlaps with an existing range in the axial direction of the radial gap.

主权项

1. A motor comprising:
a rotating portion including a rotor magnet; and a stationary portion including a stator which faces the rotor magnet; wherein the stationary portion includes:
a shaft component that includes an inner shaft portion which is disposed around a central axis, and an outer shaft portion which is fixed to an outer circumferential surface of the inner shaft portion;an upper plate portion that is disposed on one side of the shaft component and extends radially outward from one side of the shaft component; anda lower plate portion that is disposed on the other side of the shaft component and extends radially outward from the other side of the shaft component; wherein the rotating portion includes a sleeve portion which is disposed between the upper plate portion and the lower plate portion; lubricating oil is continuously provided between a radial gap between the sleeve portion and the outer shaft portion and a lower thrust gap between the sleeve portion and the lower plate portion; a lower thrust dynamic pressure generating groove array is provided on at least one surface of a lower surface of the sleeve portion and an upper surface of the lower plate portion, which define the lower thrust gap; a radial dynamic pressure generating groove array is provided on at least one surface of an inner circumferential surface of the sleeve portion and an outer circumferential surface of the outer shaft portion, which define the radial gap; and at least a portion in an axial direction of a fixing range, in which the outer shaft portion and the inner shaft portion radially overlap, radially overlaps with an existing range in the axial direction of the radial gap.