Patent ID: 8944686
Filing Date: 2015-02-03
Classification: F16C

Abstract:
1. A radial foil bearing for supporting a rotary shaft by being externally attached to the rotary shaft, the radial foil bearing comprising: a cylindrical top foil disposed so as to face the rotary shaft; a back foil disposed on a radially outer side of the top foil; and a cylindrical bearing housing accommodating the top foil and the back foil in an inside of the bearing housing, wherein the top foil is formed by winding a rectangular metal foil into a cylindrical shape so that one end of the metal foil is extended out in a tangential direction of a cylinder formed by the metal foil, wherein an engagement groove is formed on an inner circumferential surface of the bearing housing in an axial direction of the bearing housing, wherein the engagement groove is formed so that a depth direction thereof corresponds to the tangential direction of the cylinder of the top foil, wherein the one end extending out in the tangential direction of the cylinder of the top foil engages with the engagement groove, and wherein a thin portion is formed in each of the one end and the other end opposite to the one end in the top foil, the thin portion being thinner than an intermediate portion between the one end and the other end.