JPS6439931U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案による密封軸受装置を有するス
ピンドルモータの断面図、第２図及び第３図は密
封軸受装置の異なる実施例の断面図、第４図及び
第５図は異なる従来装置の断面図である。 ５…磁性軸、１８…内輪、１９…ボール、２０
…外輪、３…ボールベアリング、２３…凹所、２
５，２６…ヨーク板、２７…永久磁石、２８，２
９…磁性流体。 Fig. 1 is a sectional view of a spindle motor having a sealed bearing device according to the present invention, Figs. 2 and 3 are sectional views of different embodiments of the sealed bearing device, and Figs. 4 and 5 are sectional views of different conventional devices. It is a diagram. 5...Magnetic shaft, 18...Inner ring, 19...Ball, 20
...Outer ring, 3...Ball bearing, 23...Recess, 2
5, 26... Yoke plate, 27... Permanent magnet, 28, 2
9...Magnetic fluid.

Claims (1)

【実用新案登録請求の範囲】 磁性の軸に嵌入される内輪と、この内輪にボー
ルを介して対峠する外輪を有するボールベアリン
グを備え、 前記外輪を内輪の長さより長くして、内輪の端
面位置に、この端面と外輪の内周面とで凹所が形
成され、 この凹所内に、外輪の内周面に圧入される一対
のヨーク板と、この一対のヨーク板の間に介挿さ
れ軸方向に着磁された永久磁石とを配置し、 各ヨーク板の内周面と前記軸との空隙に磁性流
体を介在してなる密封軸受装置。[Claims for Utility Model Registration] A ball bearing having an inner ring fitted into a magnetic shaft and an outer ring opposed to the inner ring through balls, the outer ring being longer than the inner ring, and the end face of the inner ring being longer than the inner ring. At this position, a recess is formed between this end face and the inner peripheral surface of the outer ring, and in this recess, a pair of yoke plates are press-fitted into the inner peripheral surface of the outer ring, and a recess is inserted between the pair of yoke plates and A sealed bearing device in which a magnetized permanent magnet is arranged, and a magnetic fluid is interposed in a gap between the inner circumferential surface of each yoke plate and the shaft.