Patent ID: 11940005
Assignee: IHI CORPORATION
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 6:
7. A radial foil bearing comprising:
a bearing housing which has an insertion hole therein;
a top foil which is disposed inside the insertion hole; and
a foil structure which is interposed between the top foil and the bearing housing,
wherein the foil structure has a folded protruding portion that is bent outward in a radial direction of the insertion hole and is bent back inward in the radial direction,
the folded protruding portion is in contact with an inner surface of a fitting groove formed in an end surface of the bearing housing in an axial direction in an energy storing state and is fitted to the fitting groove, the axial direction being a direction in which the insertion hole extends,
the foil structure includes
a back foil disposed along an inner peripheral surface of the insertion hole, and
an intermediate foil that is supported by the back foil and is in contact with the top foil,

the back foil has the folded protruding portion, and
the intermediate foil has a second folded protruding portion fitted to a space inside the folded protruding portion of the back foil.