Hydrodynamic bearing, spindle motor and hard disk drive,申请号US20030403437-传众专利搜索

Hydrodynamic bearing, spindle motor and hard disk drive

申请公布号：US6948852(B2)

申请号：US20030403437

申请日期：2003.03.31

申请公布日期：2005.09.27

申请人：

MINEBEA CO., LTD.

发明人：OELSCH JUERGEN

分类号：F16C17/02;F16C33/10;F16C33/74;G11B19/20;H02K7/08;(IPC1-7):F16C32/06

主分类号：F16C17/02

摘要：A hydrodynamic bearing having a shaft ( 10 ) and a bearing sleeve ( 12 ), which encloses the shaft with a slight radial clearance forming a concentric bearing gap. An equalizing volume cavity ( 20 ) is formed at at least one end of the bearing. At least one micro-passage ( 26 ) connects the bearing gap via appropriate openings with the equalizing volume cavity ( 20 ). Bearing fluid completely fills the bearing gap ( 24 ) and the micro-passage ( 26 ) and at least partially fills the equalizing volume cavity ( 20 ). The bearing fluid forms a continuous fluid film between the bearing gap ( 24 ) and the equalizing volume cavity ( 20 ).