Patent ID: 6371651
Filing Date: 2002-04-16
Classification: F16C

Abstract:
A thrust dynamic pressure bearing in which first and second thrust bearing faces disposed on a housing are respectively opposed to one thrust receiving face and another thrust receiving face of a flange-like thrust receiving portion disposed on a shaft, and have a communication portion through which outer circumference end portions of said first and second thrust bearing faces communicate with each other by means of a minute gap with respect to an outer circumference face of said flange-like thrust receiving portion, at least one of said opposing thrust bearing and thrust receiving faces has dynamic pressure generating grooves for generating a dynamic pressure, anda sealed space defined by said opposing thrust bearing and thrust receiving faces, said communication portions of said thrust bearing faces, and said outer circumference face of said flange-like thrust receiving portion is filled with a lubricant, wherein said thrust receiving portion has a substantially tapered shape in section, a thickness of said thrust receiving portion becoming smaller as moving toward an outer circumference of said thrust receiving portion, and axial spaces between said thrust receiving portion and said thrust bearing faces become wider as moving toward the outer circumference of said thrust receiving portion.