Radial foil bearing

摘要

The radial foil bearing includes: a top foil; an intermediate foil; a back foil; and a bearing housing accommodating the top foil, the intermediate foil and the back foil. The top foil is formed by winding a rectangular metal foil which includes a first uneven portion and a second uneven portion, into a cylindrical shape so as to overlap the first and second uneven portions with each other, wherein the first uneven portion is composed of a projecting portion and a depressed portion formed on one edge of the metal foil, and the second uneven portion is composed of a depressed portion, and a projecting portion formed on another edge of the metal foil. The projecting portions of the first and second uneven portions pulled out near the bearing housing engage with engagement grooves of the hearing housing.

主权项

1. A radial foil bearing used for supporting a rotary shaft so as to encircle the rotary shaft, the radial foil bearing comprising:
a cylindrical top foil disposed so as to face the rotary shaft; an intermediate foil disposed outside of the top foil in a radial direction thereof; a back foil disposed outside of the intermediate foil in the radial direction; and a cylindrical bearing housing accommodating the top foil, the intermediate foil and the back foil, wherein engagement grooves are formed on an inner circumferential surface of the bearing housing in an axial direction thereof, the top foil is formed by winding a rectangular metal foil which includes a first uneven portion and a second uneven portion, into a cylindrical shape so as to overlap the first and second uneven portions with each other, the first uneven portion being composed of a projecting portion and a depressed portion formed on one edge of the metal foil, the second uneven portion being composed of a depressed portion and a projecting portion formed on another edge of the metal foil opposite to the one edge, the projecting portion of the first uneven portion is disposed so as to be pulled out near the bearing housing through the depressed portion of the second uneven portion, the projecting portion of the second uneven portion is disposed so as to be pulled out near the bearing housing through the depressed portion of the first uneven portion, and the projecting portions of the first and second uneven portions pulled out near the bearing housing engage with the engagement grooves.