JPH0988950A - Foil gas bearing - Google Patents
Foil gas bearingInfo
- Publication number
- JPH0988950A JPH0988950A JP27058995A JP27058995A JPH0988950A JP H0988950 A JPH0988950 A JP H0988950A JP 27058995 A JP27058995 A JP 27058995A JP 27058995 A JP27058995 A JP 27058995A JP H0988950 A JPH0988950 A JP H0988950A
- Authority
- JP
- Japan
- Prior art keywords
- bearing
- foil
- housing
- bearing housing
- slit
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Landscapes
- Support Of The Bearing (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、遠心圧縮機または
膨張機もしくはタービン等のタービン機械のごとき高速
回転を必要とする機器の回転軸支承に好適なガス軸受に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas bearing suitable for supporting a rotary shaft of a device such as a centrifugal compressor or an expander or a turbine machine such as a turbine that requires high speed rotation.
【０００２】[0002]
【従来の技術】従来、高速回転が必要とされる機器の軸
受装置として、図２，図３のようなガス軸受が知られて
いる。図２はバンプフォイル軸受を示しており、回転軸
１のまわりに軸受すき間８〔この軸受すき間８に外部か
ら高圧ガス（高圧空気）が供給される〕を隔てて配置し
た軸受フォイル２が、軸受ハウジング３に対してバンプ
フォイル７を介して弾性的に支持されるようになってい
る。2. Description of the Related Art Conventionally, gas bearings as shown in FIGS. 2 and 3 have been known as bearing devices for equipment requiring high-speed rotation. FIG. 2 shows a bump foil bearing, in which the bearing foil 2 arranged around the rotating shaft 1 with a bearing gap 8 (high pressure gas (high pressure air is supplied from the outside) supplied to the bearing gap 8) The housing 3 is elastically supported via the bump foil 7.
【０００３】そして回転軸１に荷重が作用した場合、バ
ンプフォイル７が変形することで軸受すき間（気体膜）
８の形状が適正化され、安定作動するようになってい
る。また図３はリーフフォイル軸受を示しており、回転
軸１のまわりに軸受すき間８〔この軸受すき間８に外部
から高圧ガス（高圧空気）が供給される〕を隔てて、複
数に分割された軸受フォイル（リーフフォイル）２Ａ
が、接点９で接するように一部を重ね合わせるように配
設され、回転軸１の軸荷重の作用に伴ってリーフフォイ
ル２Ａが回転軸１にフィットする変形を行なうようにな
っている。When a load is applied to the rotary shaft 1, the bump foil 7 is deformed to cause a bearing gap (gas film).
The shape of No. 8 has been optimized so that it can operate stably. Further, FIG. 3 shows a leaf foil bearing, which is divided into a plurality of bearings around the rotating shaft 1 with a bearing gap 8 [high pressure gas (high pressure air is supplied from the outside) to the bearing gap 8]. Foil (leaf foil) 2A
However, the leaf foils 2A are arranged so as to overlap with each other so that they are in contact with each other at the contact points 9, and the leaf foil 2A is deformed so as to fit to the rotary shaft 1 in accordance with the action of the axial load of the rotary shaft 1.
【０００４】[0004]
【発明が解決しようとする課題】ところで、上述の従来
のフォイルガス軸受では、軸荷重が小さい場合、バンプ
フォイル軸受では初期から軸受すき間形状を歪ませて軸
に予荷重を与えることができないという問題点がある。
一方リーフフォイル軸受は軸受フォイルの連続的な重な
りにより軸を包むことによって、予荷重を与えることが
でき、軸荷重が小さくても安定した作動が期待できるも
のの、リーフフォイル軸受は部品点数が多くコスト高で
あるほか、荷重が変化するような機器の場合に、その軸
中心の位置の保持性が悪く、荷重の変化による軸中心の
移動量が大きくなるなどの問題点がある。本発明は、こ
のような問題点の解決をはかろうとするものである。However, in the conventional foil gas bearing described above, when the axial load is small, the bump foil bearing cannot distort the bearing clearance shape from the initial stage and cannot preload the shaft. There is a point.
On the other hand, leaf foil bearings can be preloaded by wrapping the shaft with the continuous overlapping of bearing foils, and stable operation can be expected even if the shaft load is small, but leaf foil bearings have a large number of parts and cost. In addition to being high, in the case of a device in which the load changes, there are problems such as poor maintainability of the position of the shaft center and a large amount of movement of the shaft center due to changes in the load. The present invention seeks to solve such problems.
【０００５】[0005]
【課題を解決するための手段】本発明は、フォイルガス
軸受において、厚肉円筒で軸受ハウジングを構成すると
ともにその一部に軸方向に貫通するスリットを設け、ス
リットの幅を変化させて軸受ハウジングの内周長を変化
させるスリット幅調整手段を設け、軸受ハウジングの内
周に複数の軸方向の溝を形成し、軸受ハウジング内に、
同軸受ハウジングの内周長より長く、かつ薄板金属製の
軸受フォイルを歪形させながら強制的に軸受ハウジング
内に嵌合して、その歪みを上記溝内に膨出させ、これに
より互いに隣接する溝の間で軸受フォイルを橋渡し状に
支持させて軸受フォイルによる弾性軸受面を構成させて
課題解決の手段としている。According to the present invention, in a foil gas bearing, a bearing housing is formed of a thick-walled cylinder, and a slit penetrating in the axial direction is provided in a part of the bearing housing, and the width of the slit is changed to change the width of the bearing housing. The slit width adjusting means for changing the inner peripheral length of the bearing housing is provided, and a plurality of axial grooves are formed on the inner periphery of the bearing housing.
The bearing foil, which is longer than the inner peripheral length of the bearing housing and is made of a thin metal plate, is forcibly fitted into the bearing housing while being deformed, and the distortion is bulged into the groove so that they are adjacent to each other. The bearing foil is supported in a bridge shape between the grooves to form an elastic bearing surface by the bearing foil, which is a means for solving the problem.
【０００６】そして本発明では、スリット幅調整手段に
より、軸受ハウジングの内周長を変化することにより、
軸受ハウジング内の軸受フォイルに発生する歪の程度を
調節して、回転軸に予荷重を与えることができる。この
とき、軸受ハウジング内に形成された複数の互いにとな
り合う軸方向の溝間で軸受フォイルが橋渡し様となっ
て、軸受ハウジング内周より軸受フォイルが浮き、これ
により効果的な弾性軸受面が形成される。In the present invention, the slit width adjusting means is used to change the inner peripheral length of the bearing housing.
The degree of strain on the bearing foil in the bearing housing can be adjusted to preload the rotating shaft. At this time, the bearing foil acts as a bridge between a plurality of mutually opposing axial grooves formed in the bearing housing, and the bearing foil floats from the inner circumference of the bearing housing, thereby forming an effective elastic bearing surface. To be done.
【０００７】[0007]
【発明の実施の形態】以下、図面により本発明の一実施
形態としてのフォイルガス軸受について説明すると、図
１はその断面図である。なお図１中図２，３と同じ符号
はほぼ同一の部材を示している。BEST MODE FOR CARRYING OUT THE INVENTION A foil gas bearing according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view thereof. In FIG. 1, the same reference numerals as those in FIGS. 2 and 3 indicate almost the same members.
【０００８】この実施形態でも、回転軸１の外側に軸受
すき間８を隔てて軸受フォイル２が配設され、軸受フォ
イル２の外側に軸受ハウジング３が配設されて、フォイ
ルガス軸受を構成している。軸受ハウジング３は厚肉円
筒で形成されるとともに、厚肉円筒の一部に軸方向に貫
通するスリット５が形成されている。スリット５に、ス
リット５の幅を調節する調整ボルト６が設けられてお
り、調整ボルト６を締付けたり緩めたりして、スリット
５の幅を縮少したり拡大したりすることにより、軸受ハ
ウジング３の内周長さの減・増を可能に構成されてい
る。Also in this embodiment, the bearing foil 2 is arranged outside the rotary shaft 1 with a bearing gap 8 therebetween, and the bearing housing 3 is arranged outside the bearing foil 2 to form a foil gas bearing. There is. The bearing housing 3 is formed of a thick-walled cylinder, and a slit 5 penetrating in the axial direction is formed in a part of the thick-walled cylinder. The slit 5 is provided with an adjusting bolt 6 for adjusting the width of the slit 5. By tightening or loosening the adjusting bolt 6 to reduce or increase the width of the slit 5, the width of the bearing housing 3 is reduced. It is configured so that the inner circumference can be reduced or increased.
【０００９】軸受ハウジング３の内部に、インコネル，
ベリリューム銅などの金属の薄板製の軸受フォイル２が
配設されている。軸受フォイル２は全体形状を軸受ハウ
ジング３の内周面に沿うように、リング状に形成される
とともに、一部に軸方向に延在する切れ目が形成されて
いる。そして、切れ目を形成する一方の端部には外方へ
長く突出する突出端部21が突設され、他方の端部には外
方へ短く突出する折曲端部22が形成されている。突出端
部21は軸受ハウジング３に形成されたスリット５の内部
に挿入されるとともに、調整ボルト６を貫通されて、軸
受ハウジング３に固定されるようになっている。Inside the bearing housing 3, Inconel,
A bearing foil 2 made of a thin plate of metal such as beryllium copper is arranged. The bearing foil 2 is formed in a ring shape so that the entire shape thereof is along the inner peripheral surface of the bearing housing 3, and a cut extending in the axial direction is formed in a part thereof. A projecting end portion 21 projecting outwardly is formed at one end portion forming the break, and a bent end portion 22 projecting outwardly is formed at the other end portion. The protruding end portion 21 is inserted into the slit 5 formed in the bearing housing 3, penetrated by the adjusting bolt 6, and fixed to the bearing housing 3.
【００１０】軸受ハウジング３の内周に、等間隔に４個
の溝４が軸方向に形成されている。４個の溝４のうちの
１つは、スリット５に連通するように形成されていて
（この溝に符号11を付し他の溝と区別する）、軸受フォ
イル２に形成された突出端部21は溝11を介してスリット
５に挿入され、また折曲端部22もこの溝11内に位置する
ように、軸受フォイル２は軸受ハウジング３内に配設さ
れる。軸受フォイル２の軸受ハウジング３の内周に相対
する部分の長さは、軸受ハウジング３の内周の長さより
も長く設定されている。On the inner circumference of the bearing housing 3, four grooves 4 are formed at equal intervals in the axial direction. One of the four grooves 4 is formed so as to communicate with the slit 5 (this groove is denoted by reference numeral 11 to distinguish it from other grooves), and the protruding end portion formed on the bearing foil 2 is formed. The bearing foil 2 is arranged in the bearing housing 3 so that 21 is inserted into the slit 5 via the groove 11 and the bent end 22 is also located in this groove 11. The length of the portion of the bearing foil 2 facing the inner circumference of the bearing housing 3 is set longer than the length of the inner circumference of the bearing housing 3.
【００１１】したがって、軸受フォイル２を軸受ハウジ
ング３内に配設するとき、軸受フォイル２は強制的に軸
受ハウジング３に歪ませられながら押し込められること
になる。そして軸受フォイル２は上記の押し込め時に生
じた歪は、溝４内に膨出（符号２ａが膨出部を示す）
し、これにより両者の寸法差が吸収される。上述の構成
において、調整ボルト６を締めると、軸受ハウジング３
の内周が縮少され、これにより軸受フォイル２も軸受ハ
ウジング３の内周面に押され、折曲端部22が溝11の図１
における左側壁に押しあてられる（図１の状態）。Therefore, when the bearing foil 2 is arranged in the bearing housing 3, the bearing foil 2 is forced into the bearing housing 3 while being distorted. Then, the bearing foil 2 is swollen in the groove 4 due to the strain generated at the time of pushing in (the reference numeral 2a indicates a swollen portion)
However, this absorbs the dimensional difference between the two. In the above structure, when the adjusting bolt 6 is tightened, the bearing housing 3
1, the bearing foil 2 is also pressed against the inner peripheral surface of the bearing housing 3, and the bent end 22 has a groove 11 as shown in FIG.
It is pressed against the left side wall in the state (state of FIG. 1).
【００１２】そしてこのとき、隣り合う溝４の間で軸受
フォイル２が橋渡し状態となって、軸受フォイル２と軸
受ハウジング３の内周との間に空間12が形成される。つ
まり、図１に示すように、軸受フォイル２が隣接する溝
の間で橋渡し様となって軸受ハウジング３の内周より浮
き、すなわち軸受フォイル２はその大部分が軸受ハウジ
ング３の内周面から離れるため、軸受フォイル２自体の
弾性のもとで自由に変形することが可能な状態となり、
軸受フォイル２による弾性軸受面が形成されることとな
る。At this time, the bearing foil 2 is bridged between the adjacent grooves 4, and a space 12 is formed between the bearing foil 2 and the inner circumference of the bearing housing 3. That is, as shown in FIG. 1, the bearing foil 2 floats from the inner circumference of the bearing housing 3 like a bridge between adjacent grooves, that is, most of the bearing foil 2 is separated from the inner circumference surface of the bearing housing 3. Since they are separated from each other, they can be freely deformed under the elasticity of the bearing foil 2 itself,
An elastic bearing surface is formed by the bearing foil 2.
【００１３】したがって、軸１の変動に効果的に軸受面
形状が追随することができ、これにより軸受荷重が変化
するような機器においても軸心位置の安定したガス軸受
が得られる。また調整ボルト６の締め具合の調節で、軸
受フォイル２に発生する歪みの大きさ、すなわち軸受フ
ォイル２の浮き量を調整することができ、軸受面の弾性
（量）の調整を調整ボルト６により調節することができ
る。Therefore, the shape of the bearing surface can effectively follow the fluctuation of the shaft 1, and thus a gas bearing whose axial center position is stable can be obtained even in equipment where the bearing load changes. Further, by adjusting the tightening degree of the adjusting bolt 6, it is possible to adjust the amount of strain generated in the bearing foil 2, that is, the floating amount of the bearing foil 2, and to adjust the elasticity (amount) of the bearing surface with the adjusting bolt 6. It can be adjusted.
【００１４】[0014]
【発明の効果】以上詳述したように、本発明のフォイル
ガス軸受によれば次のような効果ないし利点が得られ
る。 (1) 簡便な構造で予荷重調整が可能なフォイルガス軸受
を提供することができる。 (2) 軸受荷重が変化するような機器においても軸心位置
が安定でしかも低コストなガス軸受を提供できる。As described above in detail, according to the foil gas bearing of the present invention, the following effects and advantages can be obtained. (1) It is possible to provide a foil gas bearing having a simple structure and adjustable preload. (2) It is possible to provide a gas bearing with a stable axial center position and low cost even in a device in which the bearing load changes.
【図１】本発明の一実施形態としてのフォイルガス軸受
の断面図。FIG. 1 is a sectional view of a foil gas bearing according to an embodiment of the present invention.
【図２】従来のフォイルガス軸受の断面図。FIG. 2 is a cross-sectional view of a conventional foil gas bearing.
【図３】従来の他のフォイルガス軸受の断面図。FIG. 3 is a sectional view of another conventional foil gas bearing.
１ 回転軸 ２ 軸受フォイル ２ａ 膨出部 ３ 軸受ハウジング ４，11 軸方向の溝 ５ スリット ６ スリット幅調整手段としての調整ボルト ８ 軸受すき間（気体膜） 12 空間 1 rotating shaft 2 bearing foil 2a bulge 3 bearing housing 4,11 axial groove 5 slit 6 adjusting bolt as slit width adjusting means 8 bearing clearance (gas film) 12 space
Claims (1)
隔てて配設される薄板金属製の軸受フォイルと、 同軸受フォイルの外側に配設される厚肉円筒製の軸受ハ
ウジングとをそなえ、 同軸受ハウジングの一部に軸方向に延在するスリットが
形成されるとともに、同スリットの幅を調節して上記軸
受ハウジングの内周長さを調節可能なスリット幅調整手
段が設けられ、 上記軸受ハウジングの内周に複数の軸方向の溝が形成さ
れ、 上記軸受フォイルが上記軸受ハウジングの内周長さより
も長く形成されるとともに、上記軸受ハウジング内に強
制的に嵌合されて同軸受フォイルが歪形され、その歪み
が上記軸受ハウジングの内面に形成された複数の軸方向
の溝に膨出するように構成されていることを特徴とす
る、フォイルガス軸受。1. A bearing foil made of a thin metal plate, which is arranged outside the rotating shaft with a bearing gap between the rotating shaft and the rotating shaft, and a thick-walled cylindrical bearing housing arranged outside the bearing foil. In addition, a slit extending in the axial direction is formed in a part of the bearing housing, and slit width adjusting means for adjusting the width of the slit to adjust the inner peripheral length of the bearing housing is provided. A plurality of axial grooves are formed on the inner periphery of the bearing housing, the bearing foil is formed longer than the inner peripheral length of the bearing housing, and the bearing foil is forcibly fitted into the bearing housing to form the bearing. A foil gas bearing, wherein the foil is strain-shaped and the strain is configured to bulge into a plurality of axial grooves formed in the inner surface of the bearing housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27058995A JP3233840B2 (en) | 1995-09-25 | 1995-09-25 | Foil gas bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27058995A JP3233840B2 (en) | 1995-09-25 | 1995-09-25 | Foil gas bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0988950A true JPH0988950A (en) | 1997-03-31 |
| JP3233840B2 JP3233840B2 (en) | 2001-12-04 |
Family
ID=17488228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27058995A Expired - Fee Related JP3233840B2 (en) | 1995-09-25 | 1995-09-25 | Foil gas bearing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3233840B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100304580B1 (en) * | 1999-06-04 | 2001-09-24 | 구자홍 | Bearing for turbo compressor |
| KR100414105B1 (en) * | 2001-08-22 | 2004-01-07 | 엘지전자 주식회사 | Bearing for turbo compressor |
| US10352356B2 (en) * | 2015-11-19 | 2019-07-16 | Ntn Corporation | Foil bearing |
| JP2021524005A (en) * | 2018-05-29 | 2021-09-09 | ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツングＲｏｂｅｒｔ Ｂｏｓｃｈ Ｇｍｂｈ | Foil bearing |
| CN115628264A (en) * | 2022-12-22 | 2023-01-20 | 天津飞旋科技股份有限公司 | Foil type dynamic pressure air bearing and rotating mechanical shaft system |
-
1995
- 1995-09-25 JP JP27058995A patent/JP3233840B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100304580B1 (en) * | 1999-06-04 | 2001-09-24 | 구자홍 | Bearing for turbo compressor |
| KR100414105B1 (en) * | 2001-08-22 | 2004-01-07 | 엘지전자 주식회사 | Bearing for turbo compressor |
| US10352356B2 (en) * | 2015-11-19 | 2019-07-16 | Ntn Corporation | Foil bearing |
| JP2021524005A (en) * | 2018-05-29 | 2021-09-09 | ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツングＲｏｂｅｒｔ Ｂｏｓｃｈ Ｇｍｂｈ | Foil bearing |
| CN115628264A (en) * | 2022-12-22 | 2023-01-20 | 天津飞旋科技股份有限公司 | Foil type dynamic pressure air bearing and rotating mechanical shaft system |
| CN115628264B (en) * | 2022-12-22 | 2023-02-28 | 天津飞旋科技股份有限公司 | Foil type dynamic pressure air bearing and rotating mechanical shaft system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3233840B2 (en) | 2001-12-04 |
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