Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1996-10-21
1998-05-12
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 86, 310 87, 310 88, 277133, 277134, 277DIG8, 384134, 384478, 360 9804, 360 9807, 360 9908, H02K 1500, H02K 714, F16C 3372
Patent
active
057510849
ABSTRACT:
The present invention relates to a spindle motor used in a hard disc drive or a magnetic recording/reproducing apparatus, wherein air discharge guiding arrangement prevents foreign matter such as lubricating particles and dust scattered in the bearings of the spindle motor from flowing into a clean space by guiding air flows in the direction opposite to the clean space, without using any separate hermetic seal. The arrangement is characterized in that an air discharge guiding member is fitted within the internal circumferential surface of the internal barrel or fitted onto the fixed shaft of the motor be interposed between the upper bearing and the lower bearing and is provided with spiral grooves are on the internal or external circumferential surface of the air discharge guiding member, and in that a horizontal bore is formed through the longitudinal intermediate portion of the shaft and a vertical bore is formed to be extended longitudinally from the lower end of the fixed shaft to the horizontal bore and to be communicated with the horizontal bore, whereby air flows generated by the spiral grooves can be discharged to the outside through the horizontal bore and vertical bore.
REFERENCES:
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patent: 4471963 (1984-09-01), Airhart
patent: 5019733 (1991-05-01), Kano et al.
patent: 5130585 (1992-07-01), Iwamatsu et al.
patent: 5189688 (1993-02-01), Ono et al.
patent: 5451066 (1995-09-01), Totain
Dougherty Thomas M.
Nguyen Tran N.
Samsung Electro-Mechanics Co. Ltd.
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