Bearing structure and turbocharger

Patent metadata

Field	Value
Publication number	US-11441602-B2
Application number	US-202017084716-A
Country	US
Kind code	B2
Filing date	Oct 30, 2020
Priority date	Jul 27, 2018
Publication date	Sep 13, 2022
Grant date	Sep 13, 2022

Abstract

A bearing structure includes: a shaft provided with a turbine impeller; a pair of rolling bearings accommodated in a bearing hole and each including: an inner ring provided to the shaft; and an outer ring having a damper portion formed on an outer periphery of the outer ring; an opposing surface opposed to, from a turbine impeller side, a lateral surface of the outer ring of the rolling bearing provided on the turbine impeller side; and a first oil supply groove formed in the opposing surface and opposed to at least the damper portion and the lateral surface of the outer ring.

First claim

What is claimed is:

1. A hearing structure, comprising:
a shaft provided with a turbine impeller;
a pair of rolling bearings accommodated in a bearing hole and each including:
an inner ring mounted on the shaft so as to integrally rotate with the shaft; and
an outer ring having a damper portion formed on an outer periphery of the outer ring;

an opposing surface opposed to, in an axial direction of the shaft from a turbine impeller side, a lateral surface of the outer ring of the rolling bearing provided on the turbine impeller side; and
a first oil supply groove formed in the opposing surface and opposed to at least the damper portion and the lateral surface of the outer ring.

2. The bearing structure according to claim 1 , wherein the outer ring is rotatable with respect to a bearing housing in which the bearing hole is formed.

3. The bearing structure according to claim 2 ,
wherein the first oil supply groove extends to at least a position opposed to, in the axial direction of the shaft, an innermost portion in a radial direction of the lateral surface of the outer ring, and
wherein the opposing surface includes an opposing portion that continues to the first oil supply groove in a circumferential direction of the shaft and that is closest to the lateral surface of the outer ring on the opposing surface.

4. The hearing structure according to claim 3 , comprising a second oil supply groove formed in an inner peripheral surface of the bearing hole and opposed to the damper portion, and extending in the axial direction of the shaft to the first oil supply groove.

5. The bearing structure according to claim 4 , comprising:
a first oil passage formed in the inner peripheral surface of the bearing hole and opened toward the rolling bearing provided on the turbine impeller side;
a second oil passage formed in the inner peripheral surface of the bearing hole and opened toward the rolling bearing provided on a compressor impeller side; and
a third oil passage formed in the inner peripheral surface of the bearing hole and opened between the first oil passage and the second oil passage.

6. The bearing structure according to claim 3 , comprising:
a first oil passage formed in the inner peripheral surface of the bearing hole and opened toward the rolling bearing provided on the turbine impeller side;
a second oil passage formed in the inner peripheral surface of the bearing hole and opened toward the rolling bearing provided on a compressor impeller side; and
a third oil passage formed in the inner peripheral surface of the bearing hole and opened between the first oil passage and the second oil passage.

7. The bearing structure according to claim 2 , comprising:
a first oil passage formed in the inner peripheral surface of the bearing hole and opened toward the rolling bearing provided on the turbine impeller side;
a second oil passage formed in the inner peripheral surface of the bearing hole and opened toward the rolling bearing provided on a compressor impeller side; and
a third oil passage formed in the inner peripheral surface of the bearing hole and opened between the first oil passage and the second oil passage.

8. The bearing structure according to claim 2 , comprising a second oil supply groove formed in an inner peripheral surface of the bearing hole and opposed to the damper portion, and extending in the axial direction of the shaft to the first oil supply groove.

9. The bearing structure according to claim 8 , comprising:
a first oil passage formed in the inner peripheral surface of the bearing hole and opened toward the rolling hearing provided on the turbine impeller side;
a second oil passage formed in the inner peripheral surface of the bearing hole and opened toward the rolling bearing provided on a compressor impeller side; and
a third oil passage formed in the inner peripheral surface of the bearing hole and opened between the first oil passage and the second oil passage.

10. The bearing structure according to claim 1 ,
wherein the first oil supply groove extends to at least a position opposed to, in the axial direction of the shaft, an innermost portion in a radial direction of the lateral surface of the outer ring, and
wherein the opposing surface includes an opposing portion that continues to the first oil supply groove in a circumferential direction of the shaft and that is closest to the lateral surface of the outer ring on the opposing surface.

11. The bearing structure according to claim 10 , comprising a second oil supply groove formed in an inner peripheral surface of the bearing hole and opposed to the damper portion, and extending in the axial direction of the shaft to the first oil supply groove.

12. The bearing structure according to claim 11 , comprising:
a first oil passage formed in the inner peripheral surface of the bearing hole and opened toward the rolling bearing provided on the turbine impeller side;
a second oil passage formed in the inner peripheral surface of the bearing hole and opened toward the rolling bearing provided on a compressor impeller side; and
a third oil passage formed in the inner peripheral surface of the bearing bole and opened between the first oil passage and the second oil passage.

13. The bearing structure according to claim 10 , comprising:
a first oil passage formed in the inner peripheral surface of the bearing hole and opened toward the rolling hearing provided on the turbine impeller side;
a second oil passage formed in the inner peripheral surface of the bearing hole and opened toward the rolling bearing provided on a compressor impeller side; and
a third oil passage formed in the inner peripheral surface of the bearing hole and opened between the first oil passage and the second oil passage.

14. The hearing structure according to claim 1 , comprising a second oil supply groove formed in an inner peripheral surface of the hearing hole and opposed to the damper portion, and extending in the axial direction of the shaft to the first oil supply groove.

15. The bearing structure according to claim 14 , comprising:
a first oil passage formed in the inner peripheral surface of the bearing hole and opened toward the rolling bearing provided on the turbine impeller side;
a second oil passage formed in the inner peripheral surface of the bearing hole and opened toward the rolling bearing provided on a compressor impeller side; and
a third oil passage formed in the inner peripheral surface of the bearing hole and opened between the first oil passage and the second oil passage.

16. The hearing structure according to claim 1 , comprising:
a first oil passage formed in the inner peripheral surface of the bearing hole and opened toward the rolling bearing provided on the turbine impeller side;
a second oil passage formed in the inner peripheral surface of the bearing hole and opened toward the rolling bearing provided on a compressor impeller side; and
a third oil passage formed in the inner peripheral surface of the bearing hole and opened between the first oil passage and the second oil passage.

17. The bearing structure according to claim 16 , wherein the pair of rolling bearings are angular bearings having a face-to-face duplex configuration.

18. A turbocharger comprising the bearing structure of claim 1 .

Assignees

• Ihi Corp

Inventors

• Uneura Yutaka
• Tanaka Takahiro
• Mochizuki Hiroki
• NISHII Shunsuke
• Kojima Hideyuki

Classifications

• F16C19/163

  with angular contact · CPC title

• F05D2220/40

  in turbochargers · CPC title

• F16C19/548 Primary

  in O-arrangement · CPC title

• F05D2240/54

  Radial bearings · CPC title

• F16C19/547

  with two angular contact rolling bearings · CPC title