| 摘要 |
The radial foil bearing (3, 20) includes, a cylindrical top foil (10, 21), a back foil (11) disposed on a radially outer side of the top foil (10, 21), and a cylindrical bearing housing (12, 25) accommodating the top foil (10, 21) and the back foil (11). The top foil (10, 21) is formed by winding a rectangular metal foil around a rotary shaft (1) in a circumferential direction thereof. The metal foil includes a first uneven portion (17a, 23a) which has a first projecting portion (15a, 22a) and a first depressed portion (16a, 23a) on a first side thereof, and a second uneven portion (17b, 24b) which has a second projecting portion (15b, 22b) and a second depressed portion (16b, 23b) on a second side opposite to the first side. The metal foil is wound in a cylindrical shape so that the first uneven portion (17a, 23a) and the second uneven portion (17b, 24b) overlap with each other. The first projecting portion (15a, 22a) and the second projecting portion (15b, 22b) are pulled out near the bearing housing (12, 25) through the second depressed portion (16b, 23b) and the first depressed portion (16a, 23a) respectively, and engage with engagement grooves (13, 26) formed on the inner circumferential surface of the bearing housing (12, 25). |
