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Thrust foil bearing

A thrust foil bearing, foil technology, applied in the direction of bearings, shafts and bearings, sliding contact bearings, etc., can solve problems such as difficult clearance management

Pending Publication Date: 2021-10-22
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to perform strict clearance management when considering manufacturing tolerances or thermal expansion in the case of drastic temperature changes

Method used

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  • Thrust foil bearing
  • Thrust foil bearing
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Examples

Experimental program
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Effect test

Embodiment Construction

[0032] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0033] figure 1 Conceptually shows the structure of a gas turbine which is a type of turbomachinery. This gas turbine mainly includes a turbine 1 , a compressor 2 , a generator 3 , a combustor 4 , and a regenerator 5 each having blade rows formed thereon. The turbine 1 , the compressor 2 , and the generator 3 are provided with a common rotating shaft 6 extending in the horizontal direction, and the rotating shaft 6 , the turbine 1 , and the compressor 2 constitute a rotor that can rotate integrally.

[0034] The air sucked in through the air inlet 7 is compressed by the compressor 2 , heated by the regenerator 5 , and sent to the combustor 4 . Fuel is mixed and burned in this compressed air, and the turbine 1 is rotated by high-temperature and high-pressure gas. The rotational force of the turbine 1 is transmitted to the generator 3 via the rotating shaft 6 , the gen...

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PUM

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Abstract

A thrust foil bearing (40) has a thrust bearing surface (S) formed by arranging a plurality of leaves (42) side by side in a circumferential direction, wherein the thrust foil bearing is characterized in that: the leaves (42) have top foil sections Tf that form the thrust bearing surface (S); and a ratio of a circumferential length (A) of the top foil section Tf of one of the leaves (42), at the radially central position of the top foil sections Tf, to a radial length (B) from a radially inner edge (423) to a radially outer edge (424) of the top foil sections Tf is 0.66 or smaller.

Description

technical field [0001] This invention relates to thrust foil bearings. Background technique [0002] The main shaft of a turbomachine (for example, a gas turbine, a turbocharger) is rotationally driven at high speed. In addition, the turbine blades mounted on the main shaft are exposed to high temperatures. Therefore, bearings supporting these main shafts are required to withstand severe environments such as high temperature and high-speed rotation. As bearings for this purpose, oil-lubricated rolling bearings or oil dynamic pressure bearings are sometimes used, but when it is difficult to lubricate with a liquid such as lubricating oil, or when it is difficult to separately install an auxiliary machine for a lubricating oil circulation system from the viewpoint of energy efficiency , or where the resistance caused by the shear of the liquid becomes a problem, the use of these bearings is restricted. Therefore, attention has been paid to air dynamic pressure bearings as b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C17/06F16C27/02F01D25/16F02C7/06
CPCF01D25/22F05D2220/40F05D2240/52F01D25/168F16C17/042F16C2240/40F16C2360/24F16C2360/23F16C17/10F16C2206/02F02C7/06F05D2220/30F16C27/02
Inventor 吉野真人原田和庆
Owner NTN CORP