Radial foil bearing

A radial foil bearing for enclosing and supporting a 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,
• wherein engagement grooves are formed on an inner circumferential surface of the bearing housing in an axial direction of the bearing housing,
• wherein the top foil is formed by winding a rectangular metal foil around the rotary shaft in a circumferential direction thereof,
• wherein the metal foil includes a first uneven portion which has a first projecting portion and a first depressed portion on a first side of the metal foil, and a second uneven portion which has a second depressed portion formed so as to include a position corresponding to the first projecting portion and a second projecting portion formed in at least a portion of a position corresponding to the first depressed portion, on a second side opposite to the first side, and the metal foil is wound in a cylindrical shape so that the first uneven portion and the second uneven portion overlap with each other,
• wherein the first projecting portion and the second projecting portion are pulled out near the bearing housing through the second depressed portion and the first depressed portion respectively, and
• wherein the first projecting portion and the second projecting portion, which are pulled out near the bearing housing, engage with the corresponding engagement grooves.