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JP2004190762A - Foil for radial foil bearing, and radial foil bearing using the same - Google Patents

Foil for radial foil bearing, and radial foil bearing using the same Download PDF

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Publication number
JP2004190762A
JP2004190762A JP2002358226A JP2002358226A JP2004190762A JP 2004190762 A JP2004190762 A JP 2004190762A JP 2002358226 A JP2002358226 A JP 2002358226A JP 2002358226 A JP2002358226 A JP 2002358226A JP 2004190762 A JP2004190762 A JP 2004190762A
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Japan
Prior art keywords
foil
radial
bearing
foil bearing
outer ring
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.)
Pending
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JP2002358226A
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Japanese (ja)
Inventor
Kazuya Suzuki
数也 鈴木
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Koyo Seiko Co Ltd
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Koyo Seiko Co Ltd
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Priority to JP2002358226A priority Critical patent/JP2004190762A/en
Publication of JP2004190762A publication Critical patent/JP2004190762A/en
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    • 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
    • F16C43/00—Assembling bearings
    • F16C43/02—Assembling sliding-contact 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
    • 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
    • F16C2300/00—Application independent of particular apparatuses
    • F16C2300/02—General use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a wide variety of uses mentioned
    • 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
    • F16C27/00—Elastic or yielding bearings or bearing supports, for exclusively rotary movement
    • F16C27/02—Sliding-contact bearings

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foil for a radial foil bearing having high supporting ability in relation to a rotary shaft and high floating characteristic, and to provide a radial foil bearing using the same. <P>SOLUTION: This top foil 1 has a cylindrical main part 2 formed by rolling a strip metal plate having a length equal or less to/than the circumferential length of the inner peripheral surface 13 of an outer ring 10, and engagement parts 3 and 3 positioned outside the cylindrical main part 2 in the radial direction. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、ラジアルフォイル軸受用フォイルおよびそれを用いたラジアルフォイル軸受に関する。
【０００２】
【従来の技術】
従来、ラジアルフォイル軸受としては、特開平９−８８９５０号公報（特許文献１）の第１図に示されたものがある。このラジアルフォイル軸受の外輪は、肉厚円筒から成り、この肉厚円筒の一部には内周円筒面と外周円筒面の間を径方向に貫通する係合溝が設けられている。一方、このラジアルフォイル軸受のラジアルフォイル軸受用フォイルは、ラジアルフォイル軸受用フォイルが配置される外輪の内周円筒面の周方向の長さよりも長い帯状の金属板から形成されている。
【０００３】
上記ラジアルフォイル軸受用フォイルは、上記帯状の金属板の長手方向の両端部を重ねるようにして金属板を円筒形状に成形した後、この円筒形状の金属板の重なり部分を構成する径方向の外側の一方の端部を塑性加工で折り曲げて形成されている。
【０００４】
上記ラジアルフォイル軸受用フォイルの円筒部である主部を、外輪の内周面に沿うように配置すると共に、ラジアルフォイル軸受用フォイルの折り曲げ部である係合部を、上記外輪の係合溝に係合配置して、ラジアルフォイル軸受用フォイルを、上記外輪に取り付けている。
【０００５】
【特許文献１】
特開平９−８８９５０号公報（第１図）
【０００６】
【発明が解決しようとする課題】
しかしながら、上記従来のラジアルフォイル軸受では、ラジアルフォイル軸受用フォイルを、ラジアルフォイル軸受用フォイルが配置される外輪の内周円筒面の周方向の長さよりも長い金属板から形成しているので、ラジアルフォイル軸受用フォイルを円筒形状に成形したとき、この円筒形状のラジアルフォイル軸受用フォイルの周方向の一部に重なり部分が生じて、ラジアルフォイル軸受用フォイルの軸方向の断面形状が、上記重なり部分によって、回転軸の浮上特性を最良にする真円形状から遠ざかって、支持能力（負荷能力）および浮上特性（浮上を開始する回転速度）が悪くなるという問題がある。
【０００７】
そこで、本発明の目的は、回転軸の支持能力が高くて、かつ、回転軸の浮上特性を最良にできる高性能なラジアルフォイル軸受を実現できるラジアルフォイル軸受用フォイルおよびそれを用いたラジアルフォイル軸受を提供することにある。
【０００８】
【課題を解決するための手段】
上記目的を達成するため、請求項１の発明のラジアルフォイル軸受用フォイルは、外輪の内周円筒面の周方向の長さ以下の略帯状の板材からなり、かつ、上記板材は主部と係合部からなり、上記板材の主部を上記外輪の内周円筒面の内側に位置するように円筒面に形成しているときに、上記係合部は上記板材の主部が定義する外周円筒面の外側に位置していることを特徴としている。
【０００９】
尚、この明細書では、上記「略帯状の板材」に、帯状の板材の周囲に一個または複数個の凸部または凹部を有する形状の板材等の帯状以外の板材も含めるものとする。
【００１０】
上記請求項１の発明のラジアルフォイル軸受用フォイルを、例えば、以下のようにラジアルフォイル軸受の外輪に取り付ける。
【００１１】
上記請求項１の発明のラジアルフォイル軸受用フォイルによれば、ラジアルフォイル軸受用フォイルを、外輪の内周円筒面の周方向の長さ以下の略帯状の板材から形成するので、略帯状の板材の主部の長手方向の両端部が重ならなくて、曲率半径が一定で真円度が高い円筒形状に成形できる。したがって、このラジアルフォイル軸受用フォイルを備えたラジアルフォイル軸受の回転軸の支持性能を向上させることができると共に、回転軸の浮上特性も最良にすることができる。また、上記係合部は、例えば、帯状の板材の弾性により、上記主部を円筒形状に成形するだけで、外周円筒面の外側に位置する。あるいは、上記係合部は、上記主部を円筒形状に成形した後、塑性変形させて、上記外周円筒面の外側に位置させても良い。
【００１２】
また、上記請求項１の発明のラジアルフォイル軸受用フォイルによれば、ラジアルフォイル軸受用フォイルを、外輪の内周円筒面の周方向の長さ以下の板材から形成したので、板材を円筒形に成形するのに、重なり部分がない円筒を形成するのに好適なロール加工を用いることができて、真円度が高い主部を簡単に形成できる。
【００１３】
また、上記請求項１の発明のラジアルフォイル軸受用フォイルによれば、外輪の内周円筒面の周方向の長さ以下の板材からラジアルフォイル軸受用フォイルを形成するので、ラジアルフォイル軸受用フォイルの材料費を低減できて、ラジアルフォイル軸受用フォイルの製造コストを低減できる。
【００１４】
また、請求項２の発明のラジアルフォイル軸受用フォイルは、請求項１に記載のラジアルフォイル軸受用フォイルにおいて、上記板材の主部を円筒面に成形したとき、上記板材の主部は周方向に略連なっていることを特徴としている。
【００１５】
上記請求項２の発明のラジアルフォイル軸受用フォイルによれば、上記板材の主部を円筒面に成形したとき、上記板材の主部は周方向に略連なっているので、回転軸の外周円筒面の略全周を、ラジアルフォイル軸受用フォイルで支持することができて、回転軸の支持能力および回転軸の浮上特性を更に向上できる。
【００１６】
また、請求項３の発明のラジアルフォイル軸受は、
回転軸の外側に軸受隙間を隔てて配置されるトップフォイルと、
このトップフォイルの径方向の外側に配置されるバンプフォイルと、
このバンプフォイルの径方向の外側に配置される外輪と
を備えるラジアルフォイル軸受であって、
上記トップフォイルが、請求項１または２に記載のラジアルフォイル軸受用フォイルであることを特徴としている。
【００１７】
上記請求項３の発明のラジアルフォイル軸受によれば、軸方向の断面において真円度が非常に高い請求項１または２に記載のラジアルフォイル軸受用フォイルを回転軸の外側に配置するので、このラジアルフォイル軸受の回転軸の支持能力（負荷能力）を向上でき、かつ、回転軸の浮上特性を向上できる（回転軸を浮上させる回転速度を小さくできる）。
【００１８】
【発明の実施の形態】
以下、本発明を図示の実施の形態により詳細に説明する。
【００１９】
図１に、図示しないラジアル（ジャーナル）フォイル軸受の外輪の内周円筒面に配置できる円筒形状に成形された本発明の第１実施形態のラジアル（ジャーナル）フォイル軸受用フォイルの一例としてのトップフォイル１を示す。
【００２０】
このトップフォイル１は、上記外輪の内周円筒面の周方向の長さ以下の例えば厚さ０．１ｍｍ〜２ｍｍ程度のステンレス鋼製の帯板から成る帯状の金属板から形成されている。詳細には、上記トップフォイル１は、上記帯状の金属板の長手方向の両端が隣接するように、上記帯状の金属板をロール加工で周方向の重なりがない円筒形に成形した後、この円筒形に成形された金属板の一端部の軸方向の両端部を径方向に切り起こして先端を屈曲させて形成されている。
【００２１】
上記円筒形に成形された金属板の切り起こされた部分以外の円筒部２は、トップフォイル１の主部２になっており、上記円筒形に成形された金属板から切り起こされた二つの部分３，３は、トップフォイル１の係合部３，３になっている。また、上記係合部３，３の先端は、屈曲して屈曲部３ａ，３ａと成っている。上記トップフォイル１の主部２は、僅かな隙間ｄを介して略周方向に連なっている。
【００２２】
図２は、図１に示すトップフォイル１が配置されたラジアルフォイル軸受の軸方向に直角方向の断面図である。
【００２３】
図２に示すように、このラジアルフォイル軸受の外輪１０の内周円筒面１３には、略径方向に延びる一つの係合溝１５が形成されている。
【００２４】
また、図２に示すように、外輪１０の内周円筒面１３の内側には、バンプフォイル８が配置されている。このバンプフォイル８は、例えばステンレス鋼から成る金属の波形板材を円筒形に成形して形成した円筒部である主部１６と、この主部１６の一端に連なると共に、主部１６の径方向の外側に位置する係合部１７とから成っている。上記係合部１７の先端１７ａは、屈曲部１７ａと成っている。
【００２５】
上記トップフォイル１とバンプフォイル８を、外輪１０に次のように配置して、図２に示すラジアルフォイル軸受を形成する。
【００２６】
先ず、上記外輪１０の内周円筒面１３の内側に、バンプフォイル８の円筒部である主部１６を、外輪１０の内周円筒面に沿うように配置すると共に、主部１６の外側に位置する係合部１７を、外輪１０の係合溝１５に係合させて、バンプフォイル８を外輪１０に取り付ける。
【００２７】
次に、上記バンプフォイル８の径方向の内側と回転軸７の間に、トップフォイル１の主部２を、バンプフォイル８の円筒部である主部１６に沿うように配置すると共に、トップフォイル１の係合部３を、外輪１０の係合溝１５およびバンプフォイル８の係合部１７に係合させて、トップフォイル１を外輪１０に取り付ける。このとき、上記トップフォイル１の係合部３の屈曲部３ａと、バンプフォイル８の係合部１７の屈曲部１７ａとは、同じ方向に屈曲して係合している。このようにして、外輪１０の内周円筒面１３の内側にバンプフォイル８、トップフォイル１を順に配置して、ラジアルフォイル軸受を形成する。
【００２８】
上記第１実施形態のトップフォイル１によれば、トップフォイル１を、外輪１０の内周円筒面１３の周方向の長さ以下の帯状の板材から形成するので、帯状の板材の長手方向の両端部が重ならなくて、曲率半径が一定で真円度が高い円筒形の主部２を形成できる。したがって、このトップフォイル１を備えたラジアルフォイル軸受は、回転軸７の支持性能が高く、かつ、回転軸７の浮上特性も良好である。
【００２９】
また、上記第１実施形態のトップフォイル１によれば、帯状の金属製板材から重なり部分がない円筒を形成するので、ロール加工を用いて真円度が高い主部２を簡単に形成できる。もし、重なり部分があると、ロール加工では、真円度が高い円筒形を成形できないのである。
【００３０】
また、上記第１実施形態のトップフォイル１によれば、外輪１０の内周円筒面１３の周方向の長さ以下の金属板からトップフォイル１を形成するので、板材を短くできて、材料費を低減できて、トップフォイル１の製造コストを低減できる。
【００３１】
また、上記第１実施形態のトップフォイル１によれば、金属板の主部１３を円筒面に成形したとき、金属板の主部１３は周方向に略連なっているので、回転軸７の外周円筒面１８を全周にわたって支持することができて、回転軸７の支持能力および回転軸７の浮上特性を更に向上できる。
【００３２】
上記第１実施形態のトップフォイル１では、帯状の金属板をロール加工で周方向の重なりがない円筒形に成形した後、この円筒形に成形された金属板の一端部の軸方向の両端部を径方向に切り起こして、一端が凸状である主部２を、周方向に略連なるようにすると共に、切り起こして塑性加工された部分である二つの係合部３，３を、円筒部である主部２が定義する外周円筒面の外側に位置させるようにしたが、係合部３，３を、金属板の弾性で径方向に起立させるようにしても良い。
【００３３】
図３に、本発明の第２実施形態のトップフォイルを示す。このトップフォイルを、帯状の金属板をロール加工で周方向の重なりがない円筒形に成形した後、この円筒形に成形された金属板の周方向の一端部に、軸方向に並ぶ２個の略コ字状の切り込みを入れて、このコ字状の切り込みの内側の部分を径方向外側に起こして形成している。このトップフォイルの円筒部である主部３２は、周方向に略連なり、切り起こされた部分である二つの係合部３３，３３は、主部３２が定義する外周円筒面の外側に位置している。この第２実施形態のトップフォイルは、第１実施形態のトップフォイル１と同様の作用効果を有する。
【００３４】
また、図４に、本発明の第３実施形態のトップフォイルを示す。このトップフォイルを、帯状の金属板の長手方向の一端部の軸方向の略中央部に凹部４７、他端部の軸方向の略中央部に上記凹部４７に嵌合できる凸部４８を形成した略帯状の金属板を、ロール加工で周方向の重なりがない円筒形に成形した後、凹部４７の両端を径方向外側に起こして形成している。このトップフォイルの円筒部である主部４２は、周方向に略連なり、径方向外側に起こされた部分である二つの係合部４３，４３は、主部４２が定義する外周円筒面の外側に位置している。
【００３５】
また、図５に、第４実施形態のトップフォイルを示す。このトップフォイルを、帯状の金属板をロール加工で周方向の重なりがない円筒形に成形した後、この円筒形に成形された金属板の周方向の一端部を径方向の外側に起こして形成している。このトップフォイルの円筒部である主部５２は、周方向に連なっておらず、起こした一端部である係合部５３は、円筒部である主部５２が定義する外周円筒面の外側に位置している。
【００３６】
尚、上記第１および第２実施形態のトップフォイルでは、トップフォイルをロール加工で円筒形に成形した後に、円筒形のトップフォイルに切り込みを入れるようにしたが、トップフォイルをロール加工する前の帯状の金属板に、予め切り込みを入れるようにしても良い。
【００３７】
また、上記第１、第２、第３および第４実施形態のトップフォイルでは、トップフォイルを、ロール加工で金属板を円筒形に成形することによって形成したが、トップフォイルを、プレス加工で金属板を円筒形に成形することによって形成しても良い。
【００３８】
また、上記第１、第２、第３および第４実施形態のトップフォイルでは、トップフォイルを、金属板から形成したが、トップフォイルを、樹脂の板材等の金属以外の材料の板材から形成しても良い。
【００３９】
また、上記第１、第２、第３および第４実施形態では、トップフォイルを用いて本発明のラジアルフォイル軸受用フォイルを実践したが、バンプフォイルを用いて本発明のラジアルフォイル軸受用フォイルを実践しても良い。
【００４０】
また、上記実施形態のラジアルフォイル軸受では、外輪１０の内周側にバンプフォイル８とトップフォイル１を配置して、トップフォイル１のみに本件発明を適用する例を示したが、本発明のラジアルフォイル軸受では、外輪の内周側にバンプフォイルとトップフォイルを配置して、バンプフォイルのみに本件発明を適用しても良い。また、本発明のラジアルフォイル軸受では、外輪の内周側にバンプフォイルとトップフォイルを配置して、バンプフォイルとトップフォイルの両方に本件発明を適用しても良い。
【００４１】
また、上記実施形態のラジアルフォイル軸受では、外輪１０の内周側にバンプフォイル８と、トップフォイル１とを配置したが、本発明のラジアルフォイル軸受では、トップフォイルを配置せずに、外輪の内周側に本件発明を適用したバンプフォイルのみを配置しても良い。また、本発明のラジアルフォイル軸受では、バンプフォイルを配置せずに、外輪の内周側に本件発明を適用したトップフォイルのみを配置しても良い。
【００４２】
【発明の効果】
以上より明らかなように、請求項１の発明のラジアルフォイル軸受用フォイルによれば、ラジアルフォイル軸受用フォイルを、外輪の内周円筒面の周方向の長さ以下の略帯状の板材から形成したので、上記板材の円筒部分である主部の軸方向の断面形状を、真円形状にでき、このラジアルフォイル軸受用フォイルを用いたラジアルフォイル軸受の支持能力および浮上特性を向上できる。
【００４３】
また、請求項１の発明のラジアルフォイル軸受用フォイルによれば、ラジアルフォイル軸受用フォイルを、外輪の内周円筒面の周方向の長さ以下の板材から形成したので、ロール加工を用いて、真円度が高い主部を簡単に形成できる。
【００４４】
また、請求項１の発明のラジアルフォイル軸受用フォイルによれば、外輪の内周円筒面の周方向の長さ以下の板材からラジアルフォイル軸受用フォイルを形成するので、材料費を低減できて、ラジアルフォイル軸受用フォイルの製造コストを低減できる。
【００４５】
また、請求項２の発明のラジアルフォイル軸受用フォイルによれば、上記板材の主部を円筒面に成形したとき、上記板材の主部は周方向に略連なっているので、回転軸の外周円筒面を全周にわたって支持することができて、回転軸の支持能力および回転軸の浮上特性を更に向上できる。
【００４６】
また、請求項３の発明のラジアルフォイル軸受によれば、軸方向の断面において真円度が非常に高い請求項１または２に記載のラジアルフォイル軸受用フォイルを回転軸の外側に配置するので、回転軸の支持能力および回転軸の浮上特性を向上できる。
【図面の簡単な説明】
【図１】本発明の第１実施形態のラジアルフォイル軸受用フォイルとしてのトップフォイルの斜視図である。
【図２】図１に示すトップフォイルを配置したラジアルフォイル軸受の軸方向に直角方向の断面図である。
【図３】本発明の第２実施形態のラジアルフォイル軸受用フォイルとしてのトップフォイルの斜視図である。
【図４】本発明の第３実施形態のラジアルフォイル軸受用フォイルとしてのトップフォイルの斜視図である。
【図５】本発明の第４実施形態のラジアルフォイル軸受用フォイルとしてのトップフォイルの斜視図である。
【符号の説明】
１ トップフォイル
２，３２，４２，５２ 主部
３，３３，４３，５３ 係合部
７ 回転軸
１０ 外輪
１３ 内周円筒面
１５ 係合溝[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a foil for a radial foil bearing and a radial foil bearing using the same.
[0002]
[Prior art]
Conventionally, there is a radial foil bearing shown in FIG. 1 of Japanese Patent Laid-Open No. 9-88950 (Patent Document 1). The outer ring of the radial foil bearing is formed of a thick cylinder, and an engaging groove is provided in a part of the thick cylinder so as to penetrate between the inner peripheral cylindrical surface and the outer peripheral cylindrical surface in the radial direction. On the other hand, the radial foil bearing foil of the radial foil bearing is formed of a strip-shaped metal plate that is longer than the circumferential length of the inner peripheral cylindrical surface of the outer ring on which the radial foil bearing foil is disposed.
[0003]
The radial foil bearing foil is formed by forming a metal plate into a cylindrical shape so that both longitudinal ends of the belt-like metal plate overlap each other, and then forming a radially outer portion constituting an overlapping portion of the cylindrical metal plate. One end of each is bent by plastic working.
[0004]
The main portion that is the cylindrical portion of the radial foil bearing foil is disposed along the inner peripheral surface of the outer ring, and the engaging portion that is the bent portion of the radial foil bearing foil is provided in the engaging groove of the outer ring. The radial foil bearing foil is attached to the outer ring in an engaging manner.
[0005]
[Patent Document 1]
JP-A-9-88950 (FIG. 1)
[0006]
[Problems to be solved by the invention]
However, in the conventional radial foil bearing described above, the radial foil bearing foil is formed from a metal plate that is longer than the circumferential length of the inner peripheral cylindrical surface of the outer ring on which the radial foil bearing foil is disposed. When the foil bearing foil is formed into a cylindrical shape, an overlap portion is generated in a part of the cylindrical radial foil bearing foil in the circumferential direction, and the radial cross-sectional shape of the radial foil bearing foil is equal to the overlap portion. Therefore, there is a problem that the support capacity (load capacity) and the floating characteristics (rotational speed at which the floating starts) are deteriorated by moving away from the perfect circular shape that optimizes the floating characteristics of the rotating shaft.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide a foil for a radial foil bearing capable of realizing a high-performance radial foil bearing having a high support capability of the rotating shaft and capable of optimizing the floating characteristics of the rotating shaft, and a radial foil bearing using the same. Is to provide.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a radial foil bearing foil according to a first aspect of the present invention comprises a substantially strip-shaped plate material having a length equal to or less than the circumferential length of the inner peripheral cylindrical surface of the outer ring, and the plate material is associated with the main portion. When the main part of the plate material is formed on the cylindrical surface so as to be located inside the inner peripheral cylindrical surface of the outer ring, the engaging part is an outer peripheral cylinder defined by the main part of the plate material. It is characterized by being located outside the surface.
[0009]
In this specification, the “substantially strip-shaped plate material” includes plate materials other than the belt shape such as a plate material having one or a plurality of convex portions or concave portions around the strip-shaped plate material.
[0010]
The radial foil bearing foil according to the first aspect of the present invention is attached to the outer ring of the radial foil bearing, for example, as follows.
[0011]
According to the foil for a radial foil bearing of the first aspect of the present invention, the foil for a radial foil bearing is formed from a substantially strip-shaped plate material having a length equal to or less than the circumferential length of the inner peripheral cylindrical surface of the outer ring. The both ends of the main part of the main part of the main part of the main part can be formed into a cylindrical shape with a constant curvature radius and high roundness. Therefore, the support performance of the rotary shaft of the radial foil bearing provided with the radial foil bearing foil can be improved, and the floating characteristics of the rotary shaft can be optimized. Moreover, the said engaging part is located in the outer side of an outer peripheral cylindrical surface only by shape | molding the said main part in a cylindrical shape by the elasticity of a strip | belt-shaped board | plate material, for example. Alternatively, the engaging portion may be positioned outside the outer peripheral cylindrical surface by plastically deforming the main portion after forming the main portion into a cylindrical shape.
[0012]
Further, according to the foil for a radial foil bearing of the first aspect of the invention, since the foil for the radial foil bearing is formed from a plate material having a length in the circumferential direction of the inner peripheral cylindrical surface of the outer ring, the plate material is formed into a cylindrical shape. For forming, a roll process suitable for forming a cylinder having no overlapping portion can be used, and a main part having high roundness can be easily formed.
[0013]
In the radial foil bearing foil according to the first aspect of the present invention, the radial foil bearing foil is formed from a plate material having a length equal to or less than the circumferential length of the inner peripheral cylindrical surface of the outer ring. The material cost can be reduced, and the manufacturing cost of the foil for the radial foil bearing can be reduced.
[0014]
A radial foil bearing foil according to a second aspect of the present invention is the radial foil bearing foil according to the first aspect, wherein when the main portion of the plate material is formed into a cylindrical surface, the main portion of the plate material is in the circumferential direction. It is characterized by being substantially connected.
[0015]
According to the radial foil bearing foil of the invention of claim 2, when the main portion of the plate material is formed into a cylindrical surface, the main portion of the plate material is substantially continuous in the circumferential direction. Can be supported by a foil for a radial foil bearing, so that the support capability of the rotating shaft and the floating characteristics of the rotating shaft can be further improved.
[0016]
The radial foil bearing of the invention of claim 3 is
A top foil disposed outside the rotating shaft with a bearing gap therebetween;
Bump foil disposed outside the top foil in the radial direction;
A radial foil bearing provided with an outer ring disposed on the outer side in the radial direction of the bump foil,
The top foil is a radial foil bearing foil according to claim 1 or 2.
[0017]
According to the radial foil bearing of the third aspect of the invention, the radial foil bearing foil according to claim 1 or 2 having a very high roundness in an axial cross section is disposed outside the rotating shaft. The support capability (load capability) of the rotary shaft of the radial foil bearing can be improved, and the floating characteristics of the rotary shaft can be improved (the rotational speed at which the rotary shaft is levitated can be reduced).
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.
[0019]
FIG. 1 shows a top foil as an example of a radial (journal) foil bearing foil according to the first embodiment of the present invention, which is formed in a cylindrical shape that can be disposed on the inner peripheral cylindrical surface of an outer ring of a radial (journal) foil bearing (not shown). 1 is shown.
[0020]
The top foil 1 is formed of a strip-shaped metal plate made of a stainless steel strip having a thickness of, for example, about 0.1 mm to 2 mm, which is equal to or less than the circumferential length of the inner peripheral cylindrical surface of the outer ring. Specifically, the top foil 1 is formed by rolling the strip-shaped metal plate into a cylindrical shape without overlapping in the circumferential direction so that both ends in the longitudinal direction of the strip-shaped metal plate are adjacent to each other. It is formed by cutting and raising both axial ends of one end of a metal plate formed into a shape in the radial direction and bending the tip.
[0021]
The cylindrical part 2 other than the raised part of the cylindrical metal plate is the main part 2 of the top foil 1, and the two metal parts cut and raised from the cylindrical metal plate are formed. The portions 3 and 3 are the engaging portions 3 and 3 of the top foil 1. Further, the distal ends of the engaging portions 3 and 3 are bent to form bent portions 3a and 3a. The main part 2 of the top foil 1 is connected in a substantially circumferential direction through a slight gap d.
[0022]
FIG. 2 is a cross-sectional view perpendicular to the axial direction of the radial foil bearing in which the top foil 1 shown in FIG. 1 is arranged.
[0023]
As shown in FIG. 2, one engagement groove 15 extending substantially in the radial direction is formed on the inner peripheral cylindrical surface 13 of the outer ring 10 of the radial foil bearing.
[0024]
Further, as shown in FIG. 2, the bump foil 8 is disposed inside the inner peripheral cylindrical surface 13 of the outer ring 10. The bump foil 8 includes a main portion 16 that is a cylindrical portion formed by forming a corrugated metal plate made of, for example, stainless steel into a cylindrical shape, and one end of the main portion 16. It consists of the engaging part 17 located outside. The distal end 17a of the engaging portion 17 is a bent portion 17a.
[0025]
The top foil 1 and the bump foil 8 are arranged on the outer ring 10 as follows to form a radial foil bearing shown in FIG.
[0026]
First, a main portion 16 that is a cylindrical portion of the bump foil 8 is arranged along the inner peripheral cylindrical surface of the outer ring 10 on the inner side of the inner peripheral cylindrical surface 13 of the outer ring 10 and is positioned outside the main portion 16. The engaging portion 17 is engaged with the engaging groove 15 of the outer ring 10, and the bump foil 8 is attached to the outer ring 10.
[0027]
Next, the main portion 2 of the top foil 1 is disposed along the main portion 16 that is the cylindrical portion of the bump foil 8 between the radial inner side of the bump foil 8 and the rotating shaft 7, and the top foil. 1 is engaged with the engagement groove 15 of the outer ring 10 and the engagement part 17 of the bump foil 8 to attach the top foil 1 to the outer ring 10. At this time, the bent portion 3a of the engaging portion 3 of the top foil 1 and the bent portion 17a of the engaging portion 17 of the bump foil 8 are bent and engaged in the same direction. In this way, the bump foil 8 and the top foil 1 are arranged in this order on the inner side of the inner peripheral cylindrical surface 13 of the outer ring 10 to form a radial foil bearing.
[0028]
According to the top foil 1 of the first embodiment, since the top foil 1 is formed from a strip-shaped plate material having a length equal to or less than the circumferential length of the inner peripheral cylindrical surface 13 of the outer ring 10, both ends of the strip-shaped plate material in the longitudinal direction are formed. It is possible to form a cylindrical main portion 2 having a constant curvature radius and high roundness without overlapping the portions. Therefore, the radial foil bearing provided with the top foil 1 has high support performance for the rotating shaft 7 and good floating characteristics of the rotating shaft 7.
[0029]
Moreover, according to the top foil 1 of the said 1st Embodiment, since the cylinder which does not have an overlap part is formed from a strip | belt-shaped metal board | plate material, the main part 2 with high roundness can be easily formed using roll processing. If there is an overlapping portion, roll processing cannot form a cylindrical shape with high roundness.
[0030]
Moreover, according to the top foil 1 of the said 1st Embodiment, since the top foil 1 is formed from the metal plate below the circumferential direction length of the inner peripheral cylindrical surface 13 of the outer ring | wheel 10, a board | plate material can be shortened and material cost is reduced. The manufacturing cost of the top foil 1 can be reduced.
[0031]
Further, according to the top foil 1 of the first embodiment, when the main portion 13 of the metal plate is formed into a cylindrical surface, the main portion 13 of the metal plate is substantially continuous in the circumferential direction. The cylindrical surface 18 can be supported over the entire circumference, and the support capability of the rotating shaft 7 and the floating characteristics of the rotating shaft 7 can be further improved.
[0032]
In the top foil 1 of the first embodiment, after forming a band-shaped metal plate into a cylindrical shape without overlapping in the circumferential direction by roll processing, both end portions in the axial direction of one end portion of the metal plate formed into the cylindrical shape Are cut and raised in the radial direction so that one end of the main portion 2 having a convex shape is substantially continuous in the circumferential direction, and the two engaging portions 3 and 3 that are cut and raised and plastic processed are formed into a cylinder. However, the engaging portions 3 and 3 may be erected in the radial direction by the elasticity of the metal plate.
[0033]
FIG. 3 shows a top foil according to a second embodiment of the present invention. After forming the top foil into a cylindrical shape without overlapping in the circumferential direction by rolling a strip-shaped metal plate, two axially aligned metal plates are formed at one end in the circumferential direction of the cylindrical metal plate. A substantially U-shaped notch is formed, and the inner portion of the U-shaped notch is raised outward in the radial direction. The main portion 32 that is the cylindrical portion of the top foil is substantially continuous in the circumferential direction, and the two engaging portions 33 and 33 that are cut and raised are located outside the outer peripheral cylindrical surface defined by the main portion 32. ing. The top foil of the second embodiment has the same operational effects as the top foil 1 of the first embodiment.
[0034]
FIG. 4 shows a top foil according to a third embodiment of the present invention. The top foil is formed with a concave portion 47 at a substantially central portion in the axial direction at one end portion in the longitudinal direction of the strip-shaped metal plate, and a convex portion 48 that can be fitted into the concave portion 47 at a substantially central portion in the axial direction at the other end portion. The substantially strip-shaped metal plate is formed into a cylindrical shape having no circumferential overlap by roll processing, and then both ends of the recess 47 are formed radially outward. The main portion 42 that is the cylindrical portion of the top foil is substantially continuous in the circumferential direction, and the two engaging portions 43 and 43 that are raised outward in the radial direction are outside the outer cylindrical surface defined by the main portion 42. Is located.
[0035]
FIG. 5 shows the top foil of the fourth embodiment. This top foil is formed by rolling a strip-shaped metal plate into a cylindrical shape that does not overlap in the circumferential direction and then raising one end in the circumferential direction of the metal plate molded into the cylindrical shape outward in the radial direction. doing. The main portion 52 that is the cylindrical portion of the top foil is not continuous in the circumferential direction, and the engaging portion 53 that is the raised one end is positioned outside the outer peripheral cylindrical surface defined by the main portion 52 that is the cylindrical portion. doing.
[0036]
In the top foil of the first and second embodiments, the top foil is formed into a cylindrical shape by roll processing, and then the cylindrical top foil is cut. However, before the top foil is rolled, A band-shaped metal plate may be cut in advance.
[0037]
In the top foils of the first, second, third, and fourth embodiments, the top foil is formed by forming a metal plate into a cylindrical shape by roll processing. The plate may be formed by forming it into a cylindrical shape.
[0038]
In the top foils of the first, second, third and fourth embodiments, the top foil is formed from a metal plate. However, the top foil is formed from a plate material other than a metal such as a resin plate material. May be.
[0039]
Moreover, in the said 1st, 2nd, 3rd and 4th embodiment, although the foil for radial foil bearings of this invention was practiced using the top foil, the foil for radial foil bearings of this invention was used using bump foil. You may practice.
[0040]
Further, in the radial foil bearing of the above embodiment, the bump foil 8 and the top foil 1 are arranged on the inner peripheral side of the outer ring 10 and the present invention is applied only to the top foil 1. In the foil bearing, a bump foil and a top foil may be disposed on the inner peripheral side of the outer ring, and the present invention may be applied only to the bump foil. In the radial foil bearing of the present invention, the bump foil and the top foil may be disposed on the inner peripheral side of the outer ring, and the present invention may be applied to both the bump foil and the top foil.
[0041]
Further, in the radial foil bearing of the above embodiment, the bump foil 8 and the top foil 1 are disposed on the inner peripheral side of the outer ring 10. However, in the radial foil bearing of the present invention, the outer ring is not disposed without the top foil. Only the bump foil to which the present invention is applied may be disposed on the inner peripheral side. In the radial foil bearing of the present invention, only the top foil to which the present invention is applied may be disposed on the inner peripheral side of the outer ring without disposing the bump foil.
[0042]
【The invention's effect】
As is apparent from the above, according to the foil for a radial foil bearing of the invention of claim 1, the foil for the radial foil bearing is formed from a substantially strip-shaped plate material having a length equal to or less than the circumferential length of the inner peripheral cylindrical surface of the outer ring. Therefore, the cross-sectional shape in the axial direction of the main portion, which is the cylindrical portion of the plate material, can be made into a perfect circle, and the supporting ability and the floating characteristics of the radial foil bearing using the radial foil bearing foil can be improved.
[0043]
Moreover, according to the foil for radial foil bearings of the invention of claim 1, since the foil for radial foil bearings is formed from a plate material having a length equal to or less than the circumferential length of the inner peripheral cylindrical surface of the outer ring, A main part with high roundness can be easily formed.
[0044]
Moreover, according to the foil for radial foil bearing of the invention of claim 1, since the radial foil bearing foil is formed from a plate material having a length equal to or less than the circumferential length of the inner peripheral cylindrical surface of the outer ring, the material cost can be reduced, The manufacturing cost of the foil for radial foil bearings can be reduced.
[0045]
According to the foil for a radial foil bearing of the invention of claim 2, when the main part of the plate member is formed into a cylindrical surface, the main part of the plate member is substantially continuous in the circumferential direction. The surface can be supported over the entire circumference, and the support capability of the rotating shaft and the floating characteristics of the rotating shaft can be further improved.
[0046]
Further, according to the radial foil bearing of the invention of claim 3, the radial foil bearing foil according to claim 1 or 2 having a very high roundness in an axial cross section is disposed outside the rotary shaft. The support capability of the rotating shaft and the floating characteristics of the rotating shaft can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of a top foil as a radial foil bearing foil according to a first embodiment of the present invention.
2 is a cross-sectional view perpendicular to the axial direction of the radial foil bearing in which the top foil shown in FIG. 1 is disposed.
FIG. 3 is a perspective view of a top foil as a radial foil bearing foil according to a second embodiment of the present invention.
FIG. 4 is a perspective view of a top foil as a radial foil bearing foil according to a third embodiment of the present invention.
FIG. 5 is a perspective view of a top foil as a radial foil bearing foil according to a fourth embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Top foil 2,32,42,52 Main part 3,33,43,53 Engagement part 7 Rotating shaft 10 Outer ring 13 Inner peripheral cylindrical surface 15 Engagement groove

Claims (3)

外輪の内周円筒面の周方向の長さ以下の略帯状の板材からなり、かつ、上記板材は主部と係合部からなり、上記板材の主部を上記外輪の内周円筒面の内側に位置するように円筒面に形成しているときに、上記係合部は上記板材の主部が定義する外周円筒面の外側に位置していることを特徴とするラジアルフォイル軸受用フォイル。It is made of a substantially strip-shaped plate material having a length equal to or less than the circumferential length of the inner peripheral cylindrical surface of the outer ring, and the plate material is composed of a main portion and an engaging portion, and the main portion of the plate material is located inside the inner peripheral cylindrical surface of the outer ring. A radial foil bearing foil, wherein the engaging portion is positioned outside an outer peripheral cylindrical surface defined by the main portion of the plate member when the cylindrical portion is formed on the cylindrical surface. 請求項１に記載のラジアルフォイル軸受用フォイルにおいて、
上記板材の主部を円筒面に成形したとき、上記板材の主部は周方向に略連なっていることを特徴とするラジアルフォイル軸受用フォイル。The radial foil bearing foil according to claim 1,
A radial foil bearing foil, wherein when the main part of the plate material is formed into a cylindrical surface, the main part of the plate material is substantially continuous in the circumferential direction. 回転軸の外側に軸受隙間を隔てて配置されるトップフォイルと、
このトップフォイルの径方向の外側に配置されるバンプフォイルと、
このバンプフォイルの径方向の外側に配置される外輪と
を備えるラジアルフォイル軸受であって、
上記トップフォイルが、請求項１または２に記載のラジアルフォイル軸受用フォイルであることを特徴とするラジアルフォイル軸受。A top foil disposed outside the rotating shaft with a bearing gap therebetween;
Bump foil disposed outside the top foil in the radial direction;
A radial foil bearing comprising an outer ring disposed on the radial outer side of the bump foil,
The radial foil bearing according to claim 1, wherein the top foil is a foil for a radial foil bearing according to claim 1.
JP2002358226A 2002-12-10 2002-12-10 Foil for radial foil bearing, and radial foil bearing using the same Pending JP2004190762A (en)

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JP2014119094A (en) * 2012-12-19 2014-06-30 Ntn Corp Foil bearing
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