Spindle motor and hard disk drive including the same
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorDong Hyun LEE
Life of this patent
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Abstract
A spindle motor includes a stator, and a rotor forming a bearing clearance filled with a lubricating fluid, together with the stator. At least one of the rotor and the stator is provided with a circulation hole through which air bubbles contained in the lubricating fluid are discharged, and a portion of the bearing clearance connected to one end portion of the circulation hole and disposed at an outer side of the circulation hole in a radial direction has a width allowing an amount of force applied to the other side of the air bubble to be less than that of force applied to one side of the air bubble when one side of the air bubble is disposed in the circulation hole and the other side thereof is disposed in the portion of the bearing clearance connected to the circulation hole.
Claims10
A spindle motor comprising:
- a stator;
- and
- a rotor forming a bearing clearance filled with a lubricating fluid, together with the stator,
- wherein at least one of the rotor and the stator is provided with a circulation hole through which air bubbles contained in the lubricating fluid are discharged, and
- a portion of the bearing clearance, connected to one end portion of the circulation hole, and disposed at an outer side of the circulation hole in a radial direction, has a width allowing an amount of force applied to the other side of the air bubble to be less than an amount of force applied to one side of the air bubble when one side of the air bubble is disposed in the circulation hole and the other side of the air bubble is disposed in the portion of the bearing clearance connected to the circulation hole.
Dependencies are inferred from the claim text.