Motor and disk drive device

A technology of motors and dynamic pressure bearings, applied in the direction of electromechanical devices, electric components, casings/covers/supports, etc., can solve problems such as complex lubricating oil design, and achieve the effect of suppressing pressure differences
CN102820727BInactive Publication Date: 2014-09-10NIDEC CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NIDEC CORP
Publication Date
2014-09-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention provides a motor and a disk drive device, and the motor includes a stationary portion and a rotating portion. The stationary portion includes a shaft portion and an outer cylindrical portion. The rotary portion includes an inner cylindrical portion, an upper annular portion located on the upper side of the inner cylinder portion, and a lower hub annular portion. An upper seal portion is formed between the shaft portion and the upper portion of the upper annular portion. A first gap is formed between the shaft portion and the upper annular portion and the inner cylinder portion, and a radial dynamic pressure bearing portion is arranged in the first gap. A second gap is formed between the inner cylinder portion and the outer cylinder portion. A third gap is formed between the lower surface of the upper annular portion and the upper surface of the outer cylindrical portion, and a thrust dynamic pressure bearing portion is arranged in the third gap. A lower seal portion is formed between the annular portion of the outer cylindrical portion and the lower hub annular portion. Further, the upper annular portion comprises a communicating path. The communicating path communicates the region between the upper sealing portion and the radial dynamic pressure bearing portion and the region radially closer to the outer side than the thrust dynamic pressure bearing portion in the third gap.
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Description

technical field

[0001] The present invention relates to electric motors. Background technique

[0002] Conventionally, as a motor of a disk drive device, there has been a bearing mechanism utilizing fluid dynamic pressure. The hydrodynamic fluid bearing device for a spindle motor disclosed in JP 2007-162759 A includes a shaft main body and a cylindrical sleeve main body into which the shaft main body is inserted. The shaft main body is fixed to the base plate of the motor. The sleeve body is fixed to the rotor of the motor. The shaft main body is provided with annular first and second thrust flanges located on the upper side and the lower side of the sleeve main body. In the dynamic pressure fluid bearing device, a radial bearing portion is formed between the shaft main body and the sleeve main body. A thrust bearing portion is formed between each of the two thrust flanges and the sleeve main body. In addition, a communication hole that communicates the two thrust gaps ...

Claims

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