Patent ID: 6250807
Filing Date: 2001-06-26
Classification: F16C,G11B

Abstract:
A hydrodynamic type oil-impregnated sintered bearing unit comprising a shaft and a hydrodynamic type oil-impregnated sintered bearing including a bearing body formed of sintered metal, said bearing body being provided with a radial bearing surface opposed to an outer periphery of said shaft via a bearing clearance and being impregnated with oil, said hydrodynamic type oil-impregnated sintered bearing supporting said shaft without contact by means of hydrodynamic action produced on said radial bearing surface in a relative rotation between said shaft and said bearing body, wherein:at least one bearing end face of said hydrodynamic type oil-impregnated sintered bearing and a flange portion provided on said shaft constitute a thrust bearing section; anda squareness between said one bearing end face and a bearing inner periphery and a squareness between said flange portion and the outer periphery of said shaft are controlled to a tolerance that said one bearing end face and said flange portion are kept out of uneven contact with each other in a relative rotation between said shaft and said bearing body.