US 11,940,005 B2
Radial foil bearing
Naomichi Omori, Tokyo (JP)
Assigned to IHI CORPORATION, Tokyo (JP)
Filed by IHI CORPORATION, Tokyo (JP)
Filed on Sep. 28, 2021, as Appl. No. 17/487,954.
Application 17/487,954 is a continuation of application No. PCT/JP2020/004913, filed on Feb. 7, 2020.
Claims priority of application No. 2019-072075 (JP), filed on Apr. 4, 2019.
Prior Publication US 2022/0010834 A1, Jan. 13, 2022
Int. Cl. F16C 17/02 (2006.01); F16C 27/02 (2006.01)
CPC F16C 17/024 (2013.01) [F16C 27/02 (2013.01)] 9 Claims
OG exemplary drawing
 
1. 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 intermediate foil has the folded protruding portion, and
a notch through which the folded protruding portion passes is formed in the back foil.
 
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.
 
9. 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 folded protruding portion is provided at each of end edges of the foil structure on both sides in the axial direction, and
the foil structure has a hole portion provided between the folded protruding portions formed at the end edges on both sides in the axial direction.