Patent ID: 7128468
Filing Date: 2006-10-31
Classification: F16C,G11B

Abstract:
1. An assemblage for forming a hydrodynamic bearing, the assemblage comprising: a shaft, unit including a bearing member having a cylindrical inner circumferential surface opposing and rotatable relative to the cylindrical outer circumferential surface of said shaft, to define a second side of the radial hydrodynamic bearing section; an annular, axially protruding projection of diameter smaller than that of said shaft and configured so as to melt under a predetermined applied voltage, said projection provided on one of either said first or second joint surfaces; and a recess outer peripherally of diameter smaller than outside that of said shaft yet larger than that of said projection, and dimensioned so as to receive said projection as molten matter, said recess provided on one of either said first or second joint surfaces; wherein by bringing said first and second joint surfaces into contact and applying predetermined voltage across said shaft and said disc member, the said projection becomes molten matter and flows into said recess, bringing said end surface of said shaft and a said flat surface of said disc member into contact with each other and welding said shaft and said disc member together.