Motor having dynamic pressure fluid bearing and disc drive...

Details Motor having dynamic pressure fluid bearing and disc drive... Motor having dynamic pressure fluid bearing and disc drive...

Filed on

2005-12-27

Date issued

2005-12-27

Examiner

Nguyen, Tran (Department: 2834)

Patent Class

Electrical generator or motor structure

SubClass

Dynamoelectric

SubSubClass

Rotary

Other Related Categories

C384S112000, C384S114000, C384S115000, C384S121000, C360S098070, C360S099080

Type

Reexamination Certificate

Status

active

Patent number

06979923

Description

ABSTRACT:
A motor (100) having a dynamic pressure fluid bearing is composed of a hub (2), a rotor (4) provided with a shaft (7) of which one end portion is securely fastened by the hub (2) and another end portion is formed with a flange (8), and a stator (3) composed of a sleeve section (9) for axially sustaining the shaft (7) so as to be rotatable freely and a thrust plate (10) secured on the sleeve section (9) so as to confront with the flange (8), wherein the dynamic pressure fluid bearing is composed of a thrust dynamic pressure fluid bearing constituted by the flange (8) and the thrust plate (10), and wherein the shaft (7) is provided with a through hole (17) bored through the shaft (7) from the one end surface to the other end surface, and wherein the through hole (17) is formed in a shape having an opening to the other end surface of the shaft (7) by way of a funnel shaped section (17c) of which diameter gradually increases toward the other end surface of the shaft (7).

REFERENCES:
patent: 5713670 (1998-02-01), Goldowsky
patent: 6005748 (1999-12-01), Heine et al.
patent: 6034454 (2000-03-01), Ichiyama
patent: 6069768 (2000-05-01), Heine et al.
patent: 6137650 (2000-10-01), Heine et al.
patent: 6195895 (2001-03-01), Wuester, Sr. et al.
patent: 6678115 (2004-01-01), Khan
patent: 58-200816 (1983-11-01), None
patent: 10-080091 (1998-03-01), None
patent: 2003-125553 (2003-04-01), None

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