JPH0319172U

JPH0319172U -

Info

Publication number: JPH0319172U
Application number: JP8477388U
Authority: JP
Priority date: 1987-09-10
Filing date: 1988-06-27
Publication date: 1991-02-25

Description

[Brief explanation of the drawing]

第１図は本考案の第１実施例にかかり、密封装
置を内蔵した磁気デイスク回転用スピンドルモー
タの全体を示す縦断面図である。第２図は本考案
の第２実施例にかかり、第１図における要部を拡
大した上半部縦断面図である。また、第３図は第
２実施例の変形例を示す上半部縦断面図であり、
第４図ａ，ｂそれぞれは変形例における組立手順
を示す説明図である。さらに、第５図は従来例に
かかり、第１図に対応した縦断面図である。１……スピンドル軸（内側部材）、３……ハウ
ジング（外側部材）７……磁性流体保持部材、８
……磁性流体、２１……導電性接着剤、２２……
気密保持用接着剤。 FIG. 1 is a longitudinal sectional view showing the whole of a spindle motor for rotating a magnetic disk, which has a built-in sealing device, according to a first embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the upper half of the second embodiment of the present invention, which is an enlarged view of the main part in FIG. 1. Further, FIG. 3 is a vertical cross-sectional view of the upper half showing a modification of the second embodiment,
FIGS. 4a and 4b are explanatory diagrams each showing an assembly procedure in a modified example. Further, FIG. 5 is a longitudinal cross-sectional view corresponding to FIG. 1, according to a conventional example. 1...Spindle shaft (inner member), 3...Housing (outer member) 7...Magnetic fluid holding member, 8
... Magnetic fluid, 21 ... Conductive adhesive, 22 ...
Adhesive for airtightness.

Claims

[Claims for Utility Model Registration] Of two members arranged coaxially inside and outside and rotating relative to each other, it is fixed to the inner peripheral surface of the outer member, and forms a predetermined annular gap between it and the outer peripheral surface of the inner member. an annular magnetic fluid retaining member; a conductive magnetic fluid held in the annular gap; and an annular magnetic fluid retaining member bonded to an end of a fitting portion of the magnetic fluid retaining member and the outer member in a state spanning both. a conductive adhesive; and an airtight adhesive bonded to the entire circumference of the end portion of the fitting portion of the magnetic fluid holding member and the outer member so as to cover the conductive adhesive and straddle the both. A sealing device comprising: and.