KR20170051721A - Gas foil bearing having metal mesh bump - Google Patents

Gas foil bearing having metal mesh bump Download PDF

Info

Publication number
KR20170051721A
KR20170051721A KR1020150152256A KR20150152256A KR20170051721A KR 20170051721 A KR20170051721 A KR 20170051721A KR 1020150152256 A KR1020150152256 A KR 1020150152256A KR 20150152256 A KR20150152256 A KR 20150152256A KR 20170051721 A KR20170051721 A KR 20170051721A
Authority
KR
South Korea
Prior art keywords
metal mesh
bump
bearing
bumps
mesh bump
Prior art date
Application number
KR1020150152256A
Other languages
Korean (ko)
Inventor
박무룡
윤의수
손정락
황순찬
최범석
박준영
방제성
서정민
유일수
임형수
최원철
강도원
Original Assignee
한국기계연구원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 한국기계연구원 filed Critical 한국기계연구원
Priority to KR1020150152256A priority Critical patent/KR20170051721A/en
Publication of KR20170051721A publication Critical patent/KR20170051721A/en

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
    • F16C17/024—Sliding-contact bearings for exclusively rotary movement for radial load only with flexible leaves to create hydrodynamic wedge, e.g. radial foil bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/14—Special methods of manufacture; Running-in

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Support Of The Bearing (AREA)

Abstract

The present invention relates to a gas foil bearing having a metal mesh bump. The gas foil bearing comprises: a bearing housing formed to have a predetermined length along an axial direction of a rotary shaft, having an internal space into which the rotary shaft is inserted; a metal mesh bump inserted into the internal space of the bearing housing to be in contact with an inner surface of the bearing housing, having at least one fixing groove spaced apart from an axial edge of an inner surface thereof; and a top foil installed to be in contact with the inner surface of the metal mesh bump having a fixing protrusion inserted into the fixing groove. Accordingly, untangling of a strand is prevented on the axial edge of the metal mesh bump.

Description

[0001] GAS FOIL BEARING HAVING METAL MESH BUMP WITH METAL-

The present invention relates to a gas foil bearing comprising a metal mesh bump, and more particularly to a gas foil bearing comprising at least one retaining groove spaced from an axial end of a rotating shaft on an inner surface of a metal mesh bump, The present invention relates to a gas foil bearing including a metal mesh bump capable of preventing protrusion at an axial end portion of a metal mesh bump by forming a fixing protrusion inserted and fixed in a fixing groove on a top foil provided on a side surface.

Foil Bearing is a thin foil metal foil that is applied to APU or Air Conditioning System (ACM) for aircraft by using the dynamic characteristic of air which is lubricating medium. It is a type of Aerodynamic Bea ring that supports the axial load of rotating rotating body.

The metal mesh bump is used as an accessory member of the gas foil bearing, which is a type of bump that uses a metal mesh to damp the vibration of the rotating body.

Such a gas foil bearing can generally be divided into a foil bump gas foil bearing and a metal mesh bump gas foil bearing which are formed into a concavo-convex shape according to the type of bump inserted into the bearing body.

The metal mesh bump gas foil bearing is a bearing in which a mesh-shaped metal mesh molded article is installed in a bearing housing.

Such a metal mesh bump gas foil bearing is advantageous in that it can be applied to gas foil bearings because it is easy to manufacture and simple in structure as well as in performance compared to foil bump applied gas foil bearings.

FIG. 1 is a perspective view of a conventional metal mesh bump gas foil bearing, and FIG. 2 is an exploded perspective view of FIG.

1 and 2, a conventional metal mesh bump gas foil bearing 100 includes a bearing housing 110, a metal mesh bump 120, and a top foil 130, The work 130, the metal mesh bump 120, and the bearing housing 110 are located.

A general manufacturing and assembling of the gas foil bearing 100 including the metal mesh bumps will be briefly described. A cylindrical metal mesh bump 120 formed of a metal mesh on the inner circumference of the cylindrical bearing housing 110 is assembled by an interference fit method And the top foil 130 is inserted and fixed in the cylindrical metal mesh bumper inner diameter 120.

The metal mesh bump 120 is formed with an insertion slot 121 through which the top foil 130 is inserted and the insertion slot 121 is formed along the axial direction of the metal mesh bump 120, So as to communicate with the outside.

The top foil 130 is disposed in contact with the inner surface of the metal mesh bump 120 and the fitting portion 131 is formed at the circumferential end of the bobbin 120 to be inserted into the insertion slot 121.

Since the metal mesh bump 121 is formed by stacking a plurality of metal mesh bump fabrics formed in a plurality of lattice shapes, the metal mesh bump fabric 121 is formed in such a manner that, at the axial or circumferential end of the metal mesh bump fabric, There is a problem that a phenomenon of occurrence occurs more frequently in a portion where the insertion slot 121 is formed.

In addition, the metal mesh bumps 120 are generally used in a cylindrical shape with one axial body length equal to the axial length of the gas foil bearing.

The ratio of the diameter to the length (L / D) of the universally designed gas foil bearing is applied to 1. In this case, when the metal mesh bump 120 is integrally compression-molded, the density is not uniform over the entire length Resulting in a problem of securing a reliable bump performance.

SUMMARY OF THE INVENTION It is an object of the present invention to solve at least the above-described problems in the prior art, and it is an object of the present invention to provide a metal bumper which has at least one fixing groove spaced from an axial edge of a rotary shaft, And a metal mesh bump capable of preventing occurrence of a phenomenon at an axial edge by coupling and fixing a top foil to a gas foil bearing.

It is another object of the present invention to provide a gas foil bearing including a metal mesh bump which is divided into a plurality of metal mesh bumps along the axial direction of the rotating shaft so as to make the density of the metal mesh bumps uniform along the axial direction of the rotating shaft.

According to an aspect of the present invention, there is provided a gas foil bearing mounted on a rotary shaft, the bearing housing being formed with an internal space into which the rotary shaft is inserted and having a predetermined length along an axial direction of the rotary shaft; A metal mesh bump which is inserted into an inner space of the bearing housing to be in contact with an inner surface of the bearing housing and has at least one fixing groove formed on an inner surface thereof so as to be spaced from an axial edge; And a top foil provided in contact with an inner surface of the metal mesh bump and having a fixing protrusion inserted into the fixing groove. The gas foil bearing includes a metal mesh bump.

Here, the fixing projections of the top plate may be formed at the circumferential end portions.

When the plurality of fixing grooves of the metal mesh bumps are formed, they may be spaced apart from each other in the axial direction of the metal mesh bumps.

The metal mesh bumps may be divided into a plurality of metal mesh bumps along the axial direction, and the sum of the axial lengths of the metal mesh bumps may correspond to the axial length of the bearing housing.

Here, the metal mesh bumps to be divided may have the same axial length.

According to the present invention, at least one fixing groove spaced from the axial edge of the rotary shaft is formed on the inner surface of the metal mesh bump provided in the bearing housing, and the top foil is fixedly coupled to the fixing groove, There is provided a gas foil bearing including a metal mesh bump capable of preventing a phenomenon of occurrence.

There is also provided a gas foil bearing including a metal mesh bump which is divided into a plurality of metal mesh bumps along the axial direction of the rotating shaft so as to make the density of the metal mesh bumps uniform along the axial direction of the rotating shaft.

Figure 1 is a perspective view of a gas foil bearing including a conventional metal mesh bump,
Fig. 2 is an exploded perspective view of Fig. 1,
3 is a perspective view of a gas foil bearing including a metal mesh according to a first embodiment of the present invention,
FIG. 4 is an exploded perspective view of FIG. 3,
FIG. 5 is a cross-sectional view taken along line I-I 'of FIG. 3,
Figs. 6 to 10 are cross- Preparation process of a bump,
11 is an exploded view of the top plate of Fig. 3,
12 is an exploded perspective view of a gas foil bearing including a metal mesh bump according to a second embodiment of the present invention.

Prior to the description, components having the same configuration are denoted by the same reference numerals as those in the first embodiment. In other embodiments, configurations different from those of the first embodiment will be described do.

Hereinafter, a gas foil bearing including a metal mesh according to a first embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 3 is a perspective view of a gas foil bearing including a metal mesh according to a first embodiment of the present invention, FIG. 4 is an exploded perspective view of FIG. 3, and FIG. 5 is a sectional view taken along line I-I ' .

3 to 5, a gas foil bearing 1 including a metal mesh according to a first embodiment of the present invention includes a bearing housing 10, a metal mesh bump 20, and a top foil 30 .

The bearing housing 10 is cylindrical and has an internal space into which the rotation shaft is inserted, and is formed to have a predetermined length along the axial direction of the rotation shaft.

The bearing housing 10 is coupled to the inner surface of the bearing housing 10 in an interference fit manner and has a length corresponding to the axial length of the bearing housing 10.

At this time, on the inner surface of the metal mesh bump 20, at least one fixing groove 21 into which the top foil 30 is inserted and fixed is formed, and the fixing groove 21 is separated from the axial direction of the bearing housing 10 .

In addition, the metal mesh bumps 20 are formed by compression molding, and at the both ends of the axial direction (20a, 20b in Fig. 7) and the circumferential side edges (20c, 20d in Fig. 7) The metal lines which can not form the metal lines are not located.

When the edge portion is press-formed in the folded state, it is possible to prevent the edge portion (phenomenon that the metal wire is loosened) from rotating even when the rotary shaft rotates.

Figs. 6 to 10 are views showing a process for manufacturing a metal mesh bump. Referring to FIG. 6, the method for manufacturing the metal mesh bump first prepares a plurality of metal mesh bump fabrics 20A.

Then, as shown in Fig. 7, the edge portions of the multi-layered metal mesh bump fabrics 20A are folded so as to abut against the outer side surface or the inner side surface. The edge portion may be folded in the state where the multiple metal mesh bump fabrics 20A are overlapped with each other, or the edge portions of the single metal mesh bump fabrics 20A may be folded and folded.

At this time, the folded edges of the metal mesh bump fabric 20A may include axially opposite side edges 20a and 20b and circumferential side edges 20a and 20b, and if necessary, axially opposite side edges 20a and 20b ) May be folded.

8, a cylindrical space 43 is formed between the outer housing 41 and the column 42, and a pressing portion (not shown) inserted into the cylindrical space 43. [ And a pressing means 44 having a plurality of pressing portions 44a.

9, the multiple metal mesh bump fabrics 20A are bent into a cylindrical shape and inserted into the cylindrical space 43 of the compression molding machine. As shown in Fig. 10, the pressing portion 44 of the pressing means 44 The metal mesh bump fabric 20A is pressed from above by a plurality of metal mesh bump fabrics 44a so as to be compression-molded into a metal mesh bump 20 having an axial length corresponding to the axial length of the bearing housing 10.

After forming the metal mesh bump 20 as described above, a predetermined fixing groove forming means capable of forming a groove inward of the metal mesh bump 20 is used to form the metal mesh bump 20 on the inner surface of the metal mesh bump 20 Thereby forming the fixing groove 21.

At this time, the fixing groove 21 is spaced from the axial edge of the metal mesh bump 20 and forms at least one. In the case of forming the plurality of fixing grooves 21, it is preferable that the plurality of fixing grooves 21 are formed to be spaced apart from each other along the axial direction.

11 is an exploded view of the top plate of Fig. Referring to FIG. 11, the top foil 30 is provided in the form of a thin film so as to be in contact with the inner surface of the metal mesh bump 20 in the form of a cylinder bend.

At this time, a fixing protrusion 31 inserted and fixed to the metal mesh bump 20 is formed at the circumferential end. The fixing protrusions 31 may be formed in numbers corresponding to the numbers of the fixing grooves 21.

In this embodiment, the top foil 30 is provided in two semicircular shapes formed separately, and fixing projections 31 are formed at the circumferential edges of the top foil 30.

As described above, since the metal mesh bumps 20 and the top foil are fixed through the fixing grooves 21 and the fixing protrusions 31, the occurrence of the occurrence of the phenomenon at the axial edge of the bearing may not occur.

Next, a gas foil bearing including a metal mesh bump according to a second embodiment of the present invention will be described. In the second embodiment, a plurality of metal mesh bumps (20 'in FIG. 12) are formed along the axial direction, and the other configurations are the same.

In the second embodiment of the present invention, a plurality of metal mesh bumps 20 'are formed along the axial direction. At this time, the sum of the axial lengths of the metal mesh bumps is formed to correspond to the axial length of the bearing housing 10.

Further, preferably, the metal mesh bumps 20 'to be divided may be formed to have the same axial length.

12 is an exploded perspective view of a gas foil bearing including a metal mesh bump according to a second embodiment of the present invention.

Referring to FIG. 12, the metal mesh bumps 20 'are divided into three along the axial direction, and their respective axial lengths are 1/3 of the axial length (l) of the bearing housing 10, Respectively.

The axial length (1 / 3L) of each metal mesh bump 20 'is formed to be 1/3 of the axial length (L) of the bearing housing 10, so that each metal mesh bump 20' ) Can have a uniform density along the axial direction.

That is, since the metal mesh bump 20 'needs to be subjected to normal compression molding during manufacturing, the compression force is less affected at the central portion than at the edge portion in the axial direction during compression, and the density of the edge portion becomes higher than the central portion.

However, as described above, by forming the plurality of metal mesh bumps 20 'along the axial direction, each of the metal mesh bumps 20' has a uniform density at the edge portion or the central portion. As a result, Lt; RTI ID = 0.0 > a < / RTI > uniform density. Accordingly, the vibration damping effect at the time of rotating the rotary shaft can be remarkably improved.

On the other hand, the fixing grooves 21 may be formed on the inner surfaces of the metal mesh bumps 20 'divided into a plurality of portions. In this case, when the plurality of fixing grooves 21 are formed, have.

The scope of the present invention is not limited to the above-described embodiments, but may be embodied in various forms of embodiments within the scope of the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

1: gas foil bearing including mesh foil bump
10: bearing housing 20, 20 ': metal mesh bump
21: Fixing groove 20A: Metal mesh bump fabric
20a, 20b: Axially opposite side edges 20c, 20d: Circumferential side edges
30: Topoil 31: Fixing projection
40: compression molding machine 41: outer housing
42: column 43: cylindrical space
44: pressing means 44a:

Claims (5)

In a gas foil bearing mounted on a rotary shaft,
A bearing housing formed with an internal space into which the rotation shaft is inserted and having a predetermined length along an axial direction of the rotation shaft;
A metal mesh bump which is inserted into the inner space of the bearing housing and is provided to be in contact with an inner surface of the bearing housing and has at least one fixing groove formed on an inner surface thereof so as to be spaced from an axial edge; And
And a metal mesh bump disposed in contact with an inner surface of the metal mesh bump, the metal mesh bump including a fixing protrusion inserted into the fixing groove. The method according to claim 1,
Wherein the fixing boss of the top foil includes a metal mesh bump formed at a circumferential end portion of the gas foil bearing. The method according to claim 1,
And a metal mesh bump formed so as to be spaced apart from each other in the axial direction of the metal mesh bump when the plurality of metal mesh bump fixing grooves are formed. The method according to claim 1,
The metal mesh bumps are divided into a plurality of portions along the axial direction,
And a sum of axial lengths of the metal mesh bumps corresponding to axial lengths of the bearing housings. 5. The method of claim 4,
Wherein the metal mesh bumps to be divided include metal mesh bumps having the same axial length.
KR1020150152256A 2015-10-30 2015-10-30 Gas foil bearing having metal mesh bump KR20170051721A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150152256A KR20170051721A (en) 2015-10-30 2015-10-30 Gas foil bearing having metal mesh bump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150152256A KR20170051721A (en) 2015-10-30 2015-10-30 Gas foil bearing having metal mesh bump

Publications (1)

Publication Number Publication Date
KR20170051721A true KR20170051721A (en) 2017-05-12

Family

ID=58740090

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150152256A KR20170051721A (en) 2015-10-30 2015-10-30 Gas foil bearing having metal mesh bump

Country Status (1)

Country Link
KR (1) KR20170051721A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114198390A (en) * 2021-12-16 2022-03-18 中车株洲电机有限公司 Radial foil air bearing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114198390A (en) * 2021-12-16 2022-03-18 中车株洲电机有限公司 Radial foil air bearing

Similar Documents

Publication Publication Date Title
US7610671B2 (en) Method for assembling an electric motor using a slip fit tolerance ring
JP5664789B2 (en) Radial foil bearing
JP6227096B1 (en) Earth brush for rotating electrical machine
US9618042B2 (en) Inner ring with undercut to improve tang flexibility
US10801547B2 (en) Rolling bearing and motor having the same
JP2016077034A (en) Rotor with balancer weight, and motor
JP6416786B2 (en) Rotating machine with damping collar
JP2003262222A (en) Foil bearing
US3460427A (en) Retaining ring
JP6600522B2 (en) Bush bearing and bearing mechanism including the same
US8376617B2 (en) Snap-in bearing insert
CA3093220C (en) Radial foil bearing
KR20170051721A (en) Gas foil bearing having metal mesh bump
KR20170075888A (en) Gas foil bearing having a plurality of metal mesh bump and manufacturing method for thereof
CN204805339U (en) Bearing, axle, bearing fit spare and bearing assembly
CN113911202A (en) Ball circulation assembly and steering gear
JP6324812B2 (en) Press fitting structure for rotating electrical machine and stator
EP3128651A1 (en) Motor
JP2007166754A (en) Rotary electric machine with split core and its manufacturing process
WO2014132890A1 (en) Shield member and method for manufacturing same
CN204664183U (en) Bearing block assembly and motor
CN112653257A (en) Motor stator casing, motor
JP2016041958A (en) Bearing device and motor
US20210203201A1 (en) Cylindrical mounting sleeve with an elongated protrusion on an inner surface
KR20180045143A (en) Motor of assembly enhancement type

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E90F Notification of reason for final refusal
E601 Decision to refuse application