发明名称
摘要 PURPOSE:To improve a pressure resisting property of a seal at the pressure rise in a bearing section by disposing a magnetic fluid seal provided with an end ring and a bearing spaced therefrom in a magnetic pole piece and providing a dynamic pressure generating element in the magnetic fluid seal section. CONSTITUTION:A bearing device 2 consists of an inner race 10, permeable thrust collar 11 and non-magnetic outer race 12, and magnetic fluid 15 is supplied to a gap 14 between the inner and outer races 10, 12. A magnetic fluid seal is composed of magnetic pole pieces 20, 21, permanent magnet 17, non- magnetic ring 18 provided with a dynamic pressure generating groove 19, thrust collar 11 and magnetic fluid 15. The magnetic fluid 15 is strongly magnetized at the inside diameter end portions of the magnetic pole pieces 20, 21 in non- rotation of the bearing device to seal the magnetic fluid 15. When the internal pressure in the bearing 2 is increased by exothermic action in the rotation of the bearing, a fluid force is generated in the dynamic pressure generating groove 19 and the magnetic fluid 15 is shifted in the direction arrow to prevent the magnetic fluid from leakage in the distal end of the magnetic pole piece 20.
申请公布号 JP2923019(B2) 申请公布日期 1999.07.26
申请号 JP19900247507 申请日期 1990.09.19
申请人 HITACHI SEISAKUSHO KK 发明人 ARAI KATSUTOSHI
分类号 F16J15/43;F16C32/04;F16C33/74;F16J15/40;H02K5/15;H02K29/00 主分类号 F16J15/43
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