| 摘要 |
A foil bearing supports a cylindrical rotary shaft 2, the foil bearing including: a hollow cylindrical outer ring 4 which is supported by a stationary member, and surrounds the rotary shaft with a predetermined gap therebetween; a thin-film-shaped top foil 3a which surrounds the outer surface of the rotary shaft, and of which one circumferential end is fixed to the inner surface of the outer ring; and a back foil 3b which is formed by a thin film sandwiched between the top foil and the inner surface of the outer ring and elastically supporting the top foil. The back foil 3b includes a support portion which comes into contact with the inner surface of the outer ring and is immovable in the circumferential direction, and an elastic portion which is supported by the support portion and is elastically bent in the radial direction by surface pressure from the top foil. |
