Fluid dynamic pressure bearing and spindle motor

Details Fluid dynamic pressure bearing and spindle motor Fluid dynamic pressure bearing and spindle motor

2007-09-04

2009-12-22

Hanh, Nguyen N (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

Reexamination Certificate

active

07635936

ABSTRACT:
A fluid dynamic bearing includes a shaft, a stationary portion supporting the shaft in a rotatable manner, a lubricating oil arranged in a radial gap defined between an outer circumferential surface of the shaft and a surface of the stationary portion, opposing each other. The fluid dynamic bearing includes a first seal portion arranged radially outside of the radial gap, and a second seal portion arranged at an axially upper end of the radial gap. The axial length of the first seal portion is greater than that of the second seal portion.

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Shigeharu Sumi; “Fluid Dynamic Pressure Bearing ANS Spindle Motor”; U.S. Appl. No. 10/904,384, filed Nov. 8, 2004.

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