| 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). |
| 主权项 |
1. 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.
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