Thrust bearing

Patent metadata

Field	Value
Publication number	US-9970479-B2
Application number	US-201615209869-A
Country	US
Kind code	B2
Filing date	Jul 14, 2016
Priority date	Jan 30, 2014
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A thrust bearing disposed facing a thrust collar provided on a rotary shaft, the thrust bearing includes: a top foil disposed facing the thrust collar; a back foil disposed on a side of the top foil opposite to another side of the top foil facing the thrust collar; and an annular plate-shaped base plate supporting the back foil. The back foil is formed of a plurality of back foil pieces. The top foil is formed of a plurality of top foil pieces. A vibration-damping foil piece is disposed in each of the positions between the back foil pieces and the top foil pieces.

First claim

The invention claimed is:

1. A thrust bearing disposed so as to face a thrust collar provided on a rotary shaft, the thrust bearing comprising:
a top foil disposed so as to face the thrust collar;
a back foil disposed on a side of the top foil opposite to another side of the top foil facing the thrust collar; and
an annular plate-shaped base plate disposed on a side of the back foil opposite to the top foil, the base plate supporting the back foil;
wherein the back foil is formed of a plurality of back foil pieces arranged in a circumferential direction of the base plate,
wherein the top foil is formed of a plurality of top foil pieces disposed on the back foil pieces, and
wherein a vibration-damping foil piece is disposed in each position between the back foil pieces and the top foil pieces.

2. The thrust bearing according to claim 1 ,
wherein at least one side of each back foil piece in the circumferential direction is divided into a plurality of portions in a radial direction thereof, and
wherein at least one side of the vibration-damping foil piece in the circumferential direction is divided into a plurality of portions in the radial direction.

3. The thrust bearing according to claim 2 ,
wherein the one side of the back foil piece in the circumferential direction is divided into the plurality of portions in the radial direction, and another side of the back foil piece in the circumferential direction is a continuous edge extending in the radial direction, and
wherein the one side of the vibration-damping foil piece in the circumferential direction is divided into the plurality of portions in the radial direction, and another side of the vibration-damping foil piece in the circumferential direction is a continuous edge extending in the radial direction.

4. The thrust bearing according to claim 3 ,
wherein the back foil piece is provided with a first slit between a plurality of back foil-divided portions divided in the radial direction, and
wherein the vibration-damping foil piece is provided with a second slit between a plurality of vibration-damping foil-divided portions divided in the radial direction, the second slit overlapping the first slit.

5. The thrust bearing according to claim 4 ,
wherein an edge on a leading side of each top foil piece in a rotational direction of the rotary shaft is a top foil-fixed edge fixed to the base plate, and
wherein an edge on a leading side of the vibration-damping foil piece in the rotational direction of the rotary shaft is the continuous edge, and the continuous edge is fixed to the base plate together with the top foil-fixed edge of the top foil piece.

6. The thrust bearing according to claim 4 ,
wherein an edge on a leading side of each top foil piece in a rotational direction of the rotary shaft is a top foil-fixed edge fixed to the base plate, and
wherein an edge on a trailing side of the vibration-damping foil piece in the rotational direction of the rotary shaft is the continuous edge, and the continuous edge is fixed to the base plate together with the top foil-fixed edge of the top foil piece.

7. The thrust bearing according to claim 3 ,
wherein an edge on a leading side of each top foil piece in a rotational direction of the rotary shaft is a top foil-fixed edge fixed to the base plate, and
wherein an edge on a leading side of the vibration-damping foil piece in the rotational direction of the rotary shaft is the continuous edge, and the continuous edge is fixed to the base plate together with the top foil-fixed edge of the top foil piece.

8. The thrust bearing according to claim 3 ,
wherein an edge on a leading side of each top foil piece in a rotational direction of the rotary shaft is a top foil-fixed edge fixed to the base plate, and
wherein an edge on a trailing side of the vibration-damping foil piece in the rotational direction of the rotary shaft is the continuous edge, and the continuous edge is fixed to the base plate together with the top foil-fixed edge of the top foil piece.

9. The thrust bearing according to claim 1 ,
wherein an edge on a leading side of each top foil piece in a rotational direction of the rotary shaft is a top foil-fixed edge fixed to the base plate, and
wherein an edge on a leading side of the vibration-damping foil piece in the rotational direction of the rotary shaft is fixed to the base plate together with the top foil-fixed edge of the top foil piece.

10. The thrust bearing according to claim 1 ,
wherein an edge on a leading side of each top foil piece in a rotational direction of the rotary shaft is a top foil-fixed edge fixed to the base plate, and
wherein an edge on a trailing side of the vibration-damping foil piece in the rotational direction of the rotary shaft is fixed to the base plate together with the top foil-fixed edge of the top foil piece.

11. The thrust bearing according to claim 1 ,
wherein the vibration-damping foil piece is formed of vibration-damping alloy.

12. The thrust bearing according to claim 1 ,
wherein an edge on a leading side of each top foil piece in a rotational direction of the rotary shaft is a top foil-fixed edge fixed to the base plate, and
wherein the top foil piece includes a thin part in the vicinity on a trailing side of the top foil-fixed edge in the rotational direction of the rotary shaft, the thin part being formed to be thinner than another part of the top foil piece.

13. The thrust bearing according to claim 1 ,
wherein each back foil piece is formed of a wave sheet-shaped bump foil piece in which peak parts and valley parts are alternately formed, an edge on a trailing side of the bump foil piece in a rotational direction of the rotary shaft is a bump foil-fixed edge fixed to the base plate, and the back foil piece is disposed so that an arrangement direction of the peak parts is non-parallel to the bump foil-fixed edge, and
wherein the peak parts are formed so that the height of the peak parts gradually increases from a leading side toward a trailing side of the back foil piece in the rotational direction of the rotary shaft.

14. The thrust bearing according to claim 1 ,
wherein support areas of the base plate support the back foil pieces, and each of the support areas is provided with an inclined surface whose height gradually increases from an edge on a leading side toward another edge on a trailing side of the inclined surface in a rotational direction of the rotary shaft.

15. The thrust bearing according to claim 14 ,
wherein each back foil piece is formed of a wave sheet-shaped bump foil piece in which peak parts and valley parts are alternately formed, and is disposed so that an arrangement direction of the peak parts is the same as an inclination direction of the inclined surface.

16. The thrust bearing according to claim 1 ,
wherein the vibration-damping foil piece is disposed such that a separation between the vibration-damping foil piece and the base plate gradually increases from a leading side to a trailing side of the vibration-damping foil piece in a rotational direction of the rotary shaft.

Assignees

• Ihi Corp

Inventors

• Omori Naomichi

Classifications

• F16C17/042 Primary

  with flexible leaves to create hydrodynamic wedge, e.g. axial foil bearings · CPC title

• F16C2360/00

  Engines or pumps · CPC title

• F16C27/02

  Sliding-contact bearings · CPC title

• F16C33/046

  divided or split, e.g. half-bearings or rolled sleeves · CPC title

• F16C27/08

  primarily for axial load, e.g. for vertically-arranged shafts · CPC title