Bearings – Rotary bearing – Fluid bearing
Patent
1992-06-23
1994-08-09
Kwon, John T.
Bearings
Rotary bearing
Fluid bearing
384100, 360 9908, 360 9904, 360 9907, F16C 3206
Patent
active
053373740
ABSTRACT:
A disk drive apparatus having a thick and simple structure with manufactured at low cost, and a bearing device having a thick structure, whose shaft deflection is small, and which is high in vibration and impact strength, and manufactured at low cost. The disk drive apparatus comprises a stator provided on a metal based printed circuit board, a shaft supported by a bearing device which is securely fixed by an attaching means of the stator, with the shaft being assembled with a magnet, a rotor yoke and the like. With this structure, the number of component parts can be decreased, and since a die therefor is not necessary, the cost for manufacturing it can be eliminated. Therefore, the disk drive apparatus is advantageous in manufacture. The bearing device for supporting a shaft through lubricating oil comprises a bearing body having at least one groove on an inner peripheral surface and grooves formed on both sides thereof with a smaller depth than the groove a thrust receiving portion provided at the bottom of the bearing body, and at least one vent hole. With this structure, the bearing device can be reduced in thickness without a metal bush and a ball bearing. Also, owing to the pumping effect of the shaft, the grooves and the lubricating oil, a film of the lubricating oil is formed around the shaft so that the shaft deflection can be suppressed.
REFERENCES:
patent: 3449028 (1969-06-01), Dehart De Hart
patent: 3874749 (1975-04-01), Maniak
patent: 4547081 (1985-10-01), Tanaka et al.
patent: 4798476 (1989-01-01), Sakatani et al.
patent: 4800453 (1989-01-01), Okauchi et al.
patent: 5054015 (1991-10-01), Tsukihashi et al.
Kwon John T.
Matsushita Electric - Industrial Co., Ltd.
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