Motor and disk drive apparatus

摘要

A motor includes a rotating portion and a stationary portion. The stationary portion includes a shaft component which includes an inner shaft portion and an outer shaft portion, an upper plate portion, and a lower plate portion. The upper plate portion is disposed in one side of the shaft component and extends radially outward from the one side of the shaft component. The lower plate portion is disposed on the other side of the shaft component and extends radially outward from the other side of the shaft component. The rotating portion includes a sleeve portion. The inner shaft portion and the outer shaft portion are fixed by an adhesive. An adhesive retaining portion is provided between an outer peripheral portion of the inner shaft portion and an inner peripheral portion of the outer shaft portion.

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 including 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 which is disposed on one side of the shaft component and extends radially outward from the one side of the shaft component, anda lower plate portion which is disposed on the other side of the shaft component and extends radially outward from the other side of the shaft component, the rotating portion includes a sleeve portion 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, an upper seal portion is positioned between the stationary portion and the rotating portion radially outward from the radial gap, and an upper interface of the lubricating oil is positioned in the upper seal portion, a lower seal portion is positioned between the stationary portion and the rotating portion radially outward from the radial gap and a lower interface of the lubricating oil is positioned in the lower seal 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, and 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, the inner shaft portion and the outer shaft portion are fixed by an adhesive, and an adhesive retaining portion is provided between an outer peripheral portion of the inner shaft portion and an inner peripheral portion of the outer shaft portion.