Bearing structure including a rotation member with a plurality of extended portions and a bearing member having a plurality of main bodies each including a counterface surface facing one of the plurality of extended portions in an axial direction

1. A bearing structure comprising:

a rotation member including a shaft portion and a plurality of extended portions extending radially outward from the shaft portion and arranged separated away from each other in an axial direction of the shaft portion;

a large diameter portion having a diameter larger than a diameter of the shaft portion and including the extended portion on each of one side and another side in the axial direction, the large diameter portion being included in the rotation member;

a bearing member including a plurality of main bodies through which the shaft portion is inserted, the plurality of main bodies being arranged on each of one side and another side in the axial direction with respect to the large diameter portion, the plurality of main bodies including a counterface surface facing one of the plurality of extended portions in the axial direction; and

a turbine housing in which a through hole is formed, the through hole in which the bearing member is arranged,

wherein the plurality of main bodies includes a first main body floating in the through hole, the first main body including a first flange facing an inner curved surface of the turbine housing in the axial direction, and

wherein the first flange approaches the inner curved surface of the turbine housing when a pressure in an internal space in the turbine housing exceeds a predetermined pressure.

2. The bearing structure according to claim 1 , wherein the rotation member includes a pair of the extended portions arranged so as to face each other in the axial direction.

3. The bearing structure according to claim 1 , wherein the bearing member includes one of the plurality of main bodies located between a pair of the extended portions arranged so as to face each other in the axial direction, the one of the plurality of main bodies including a pair of counterface surfaces facing the pair of extended portions, respectively.

4. The bearing structure according to claim 2 , wherein the bearing member includes one of the plurality of main bodies located between a pair of the extended portions arranged so as to face each other in the axial direction, the one of the plurality of main bodies including a pair of counterface surfaces facing the pair of extended portions, respectively.

5. The bearing structure according to claim 1 , wherein the bearing member includes a pair of the counterface surfaces arranged so as to face each other in the axial direction.

6. The bearing structure according to claim 2 , wherein the bearing member includes a pair of the counterface surfaces arranged so as to face each other in the axial direction.

7. The bearing structure according to claim 3 , wherein the bearing member includes a pair of the counterface surfaces arranged so as to face each other in the axial direction.

8. The bearing structure according to claim 4 , wherein the bearing member includes a pair of the counterface surfaces arranged so as to face each other in the axial direction.

9. The bearing structure according to claim 1 , wherein the bearing member includes one of the plurality of main bodies arranged so as to be movable in the axial direction and another one of the plurality of main bodies whose movement in the axial direction is restricted.

10. The bearing structure according to claim 2 , wherein the bearing member includes one of the plurality of main bodies arranged so as to be movable in the axial direction and another one of the plurality of main bodies whose movement in the axial direction is restricted.

11. The bearing structure according to claim 3 , wherein the bearing member includes one of the plurality of main bodies arranged so as to be movable in the axial direction and another one of the plurality of main bodies whose movement in the axial direction is restricted.

12. The bearing structure according to claim 4 , wherein the bearing member includes one of the plurality of main bodies arranged so as to be movable in the axial direction and another one of the plurality of main bodies whose movement in the axial direction is restricted.

13. The bearing structure according to claim 5 , wherein the bearing member includes one of the plurality of main bodies arranged so as to be movable in the axial direction and another one of the plurality of main bodies whose movement in the axial direction is restricted.

14. The bearing structure according to claim 6 , wherein the bearing member includes one of the plurality of main bodies arranged so as to be movable in the axial direction and another one of the plurality of main bodies whose movement in the axial direction is restricted.

15. The bearing structure according to claim 7 , wherein the bearing member includes one of the plurality of main bodies arranged so as to be movable in the axial direction and another one of the plurality of main bodies whose movement in the axial direction is restricted.

16. The bearing structure according to claim 8 , wherein the bearing member includes one of the plurality of main bodies arranged so as to be movable in the axial direction and another one of the plurality of main bodies whose movement in the axial direction is restricted.

17. The bearing structure according to claim 1 , wherein the bearing member includes one of the plurality of main bodies including a plurality of members divided in the axial direction.

18. The bearing structure according to claim 1 , wherein the plurality of extended portions includes a link plate arranged outside the turbine housing,

wherein the plurality of main bodies includes a second main body floating in the through hole, the second main body including a second flange facing the link plate in the axial direction, and

wherein the second flange comes in contact with the link plate when the pressure in the internal space in the turbine housing exceeds the predetermined pressure.