HYDRODYNAMIC BEARING ASSEMBLY

摘要

A hydrodynamic bearing assembly ( 30 ) includes a bearing sleeve ( 10 ) defining at least an open end therein ( 14 ); a shaft ( 20 ) rotatably disposed in the bearing sleeve; lubricant ( 40 ) filled in a bearing clearance ( 11 ) formed between an outer face ( 21 ) of the shaft and an inner face ( 12 ) of the bearing sleeve; and a leakage-preventing band disposed at the open end of the bearing sleeve. An outer face of the shaft defines a plurality of lubricant pressure generating grooves ( 17 ) straightly along an axial direction thereof for generation of hydrodynamic pressure of the lubricant. Each groove has a depth gradually decreased along a rotation direction of the shaft.