JP2004084798A - Roller bearing device - Google Patents

Roller bearing device Download PDF

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Publication number
JP2004084798A
JP2004084798A JP2002246766A JP2002246766A JP2004084798A JP 2004084798 A JP2004084798 A JP 2004084798A JP 2002246766 A JP2002246766 A JP 2002246766A JP 2002246766 A JP2002246766 A JP 2002246766A JP 2004084798 A JP2004084798 A JP 2004084798A
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Japan
Prior art keywords
ring
cover
pulsar
rolling bearing
bearing device
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JP2002246766A
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JP4114438B2 (en
Inventor
Tomohiro Ishii
石井　知博
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Koyo Seiko Co Ltd
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Koyo Seiko Co Ltd
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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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/723—Shaft end sealing means, e.g. cup-shaped caps or covers
    • 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
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/007—Encoders, e.g. parts with a plurality of alternating magnetic poles
    • 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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/186—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
    • 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors
    • 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
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/583—Details of specific parts of races

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the weight and size of a device without impairing the rotation detecting function. <P>SOLUTION: This roller bearing device has an outer ring 31 that is a fixed ring, an inner ring 32 rotatably supported on the outer ring 31 through a rolling element 33, a rotation detecting pulsar ring 10 mounted on one axial end side of the inner ring 32, and a cover 15 mounted on the outer ring 31 to cover the axial outside of the pulsar ring 10. Among respective radial parts of the cover 15, an opposed surface part 15b axially opposed to the pulsar ring 10 and a mounting part 15d on the outer ring 31 provided on the radially outside thereof are closer to the pulsar ring 10 than a radial center-side part 15a is, so that the axial length of the outer ring 31 for supporting the cover 15 or the pulsar ring 10 can be shortened. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、転がり軸受装置に関する。
【０００２】
【従来の技術】
自動車などでは、アンチロックブレーキシステム（ＡＢＳ）等の制御にために、車輪支持用の転がり軸受装置に回転検出器を装備させることがある。
【０００３】
回転検出器は、パルサーリングと、センサとを含む構成である。パルサーリングは、転がり軸受装置の回転輪に取り付けられ、センサは固定輪の側に前記パルサーリングと対向する状態で設けられる。回転輪と同期回転するパルサーリングの回転速度がセンサにて検出され、車輪の回転速度や回転方向などの回転状態が検出される。
【０００４】
一般的に上記パルサーリングには、櫛歯形状の金属環もしくは円周数ヶ所に透孔を設けた金属環からなる磁性片タイプと、金属製の支持環に対して周方向交互に磁極を配置してなる環状磁石を取り付けた磁石タイプとがある。
【０００５】
回転検出器を備えた転がり軸受装置の従来例として、図５に、車輪支持用の転がり軸受装置を示す。図中、４１は転がり軸受装置の全体を示し、４２はハブ軸、４３は固定輪である外輪、４４は回転輪である２個一対の内輪、４５は転動体としての玉である。
【０００６】
ハブ軸４２は、軸方向一端（図面では左端で、車体のアウター側）にフランジ４２ａを有し、このフランジ４２ａにはディスクブレーキ装置のディスクロータおよびホイール（いずれも図示せず）が取り付けられる。また、このハブ軸４２の外周部には内輪４４が嵌着されている。内輪４４は、ハブ軸４２の軸端のかしめ部４２ｂにより、ハブ軸４２の外周部上に固定されている。外輪４３は、軸方向他端（図面では右端で、車体のインナー側）にフランジ４３ａを有し、このフランジ４３ａは、車体の一部となるキャリア４６（ナックルの場合もある）に取り付けられる。
【０００７】
回転検出器４７は、パルサーリング４８と、センサ４９とからなり、パルサーリング４８は、一対の内輪４４，４４のうち、車体インナー側の内輪４４の外周部に嵌着されている。符号５０は、パルサーリング４８を保護するために該パルサーリング４８の軸方向外側を覆うカバーで、外輪４３の内周面に圧入により取り付けられる。センサ４９は、カバー５０の外面に設けられており、このカバー５０を介してセンサ４９は前記パルサーリング４８と軸方向に対向する。
【０００８】
【発明が解決しようとする課題】
ところで、従来の回転検出器付きの転がり軸受装置４１においては、カバー５０は、内輪４４等の回転部材と接触しないよう、回転部材の軸端よりもさらに軸方向外方の位置に設ける必要がある。図示の従来例に即して言えば、ハブ軸４２の軸端にあるかしめ部４２ｂの軸方向外方にカバー５０を配置する必要がある。
【０００９】
上記のように、カバー５０が軸方向外方に偏った位置に配置されることになると、このカバー５０を支持するために外輪４３の軸端部を軸方向に長くする等の必要性が生じ、外輪４３の寸法設定が制約を受ける。また、前記の必要性に応じて外輪４３の軸方向寸法を長くすると、装置全体の軸方向寸法も長くなって大型化するほか、重量が増すという問題が生じる。
【００１０】
一方、回転検出器４７を構成するパルサーリング４８は、これが取り付けられる内輪４４からカバー５０に近接する位置まで軸方向に長く延出することになる。このようなパルサーリング５０は、内輪４４への取り付け方によっては、内輪４４の軸心に対して傾くなどして、先端の本体部（磁石タイプのパルサーリングでは、環状磁石）がセンサ４９の検出範囲から外れ、回転検出に支障が生じることがある。
【００１１】
したがって、本発明の主たる課題は、回転検出の機能を損なうことなく、装置の軽量化、小型化を図ることである。
【００１２】
【課題を解決するための手段】
上述した課題を達成するために、本発明は、固定輪である外輪と、この外輪に転動体を介して回転可能に支持される内輪と、この内輪の軸方向一端側に取り付けられる回転検出用のパルサーリングと、このパルサーリングの軸方向外方を覆うよう前記外輪に取り付けられるカバーとを備え、前記カバーの径方向各部分のうち、前記パルサーリングと軸方向に対向する対面部と、その外径側に設けられる外輪への取り付け部とは、径方向中心側の部分よりもパルサーリング側に近接している転がり軸受装置を構成している。
【００１３】
上記の構成によれば、カバーの径方向各部分のうち、センサが設けられる対面部や、外輪への取り付け部が軸方向中央部寄りに位置しているから、カバーを支持する外輪の軸端部や、パルサーリングを軸方向外方に長く延出させる必要がなくなり、外輪の軸方向寸法や、パルサーリングの軸方向寸法を短くすることができる。外輪の軸方向寸法が短くなることで、装置全体の小型化、軽量化が可能になる。また、パルサーリングの軸方向寸法が短くなることで、環状磁石等、パルサーリングの本体部分のセンサに対する位置ずれを少なくして、検出不良等の不具合の発生を防止できる。
【００１４】
なお、上記構成の転がり軸受装置は、パルサーリングに対応するセンサを含まないものであってもよいし、請求項２に記載のように、前記センサがカバーの対面部の外面の所要位置に設けられているものであってもよい。
【００１５】
上記構成の転がり軸受装置において、パルサーリングは内輪の外周面肩部に取り付ければよいが、請求項３のように、内輪の外周面肩部には小径部が形成され、この小径部よりも軸方向中央部寄りの位置にパルサーリングが取り付けられ、前記小径部の周りの空間に前記対面部の一部が入り込んでいる構成としてもよい。
【００１６】
この構成によれば、カバーの対面部と外輪への取り付け部とがより軸方向中央部寄りに位置することになり、外輪やパルサーリングの軸方向寸法がさらに短くなる。また、内輪に小径部を形成することで小径部の周りにできる空間内に、対面部の一部が入り込むことで、対面部の径方向に沿った幅が広がるから、径の大きなセンサでも、パルサーリングと軸方向に対向する所要の位置に設置することができる。
【００１７】
【発明の実施の形態】
〔第１実施形態〕
図１および図２に本発明の第１実施形態を示している。ここでは、自動車の従動輪側に用いられる内輪回転型の転がり軸受装置を例に挙げる。図１は、第１実施形態に係る転がり軸受装置の全体の断面図、図２は、図１の装置の要部の拡大断面図である。図例の転がり軸受装置１は、ハブ軸２と、複列転がり軸受３と、回転検出器４とを備えている。
【００１８】
ハブ軸２の一方軸端寄り（図１において左端寄りの位置で、車体のアウター側）には、径方向外向きに延びるフランジ２ａが設けられている。このハブ軸２において、前記のフランジ２ａよりも車両インナー側の領域に複列転がり軸受３が外装されている。
【００１９】
複列転がり軸受３は、ここでは複列外向きアンギュラ玉軸受であって、二列の軌道溝を有する単一の外輪３１と、一列の軌道を有しハブ軸２の小径部２ｂに外嵌されている車体インナー側の一方の内輪３２と、二列で配設される複数の玉３３，…と、二つの冠形保持器３４，３４とを備えており、上記ハブ軸２の大径部２ｃで構成される内側軌道部が車体アウター側の他方の内輪となっている。
【００２０】
外輪３１の外周には、径方向外向きに延びるフランジ３５が設けられており、このフランジ３５よりも車体インナー側には、軸方向外方に突出する円筒部３６がある。符号２ｄは、ハブ軸２の車体インナー側の端部に形成されたかしめ部で、一方の内輪３２をハブ軸２の小径部２ｂ上の所要位置に固定している。なお、ハブ軸２の小径部２ｂ上の内輪３２は、該小径部２ｂの端部に螺合されるナットにより固定される場合もある。
【００２１】
そして、外輪３１のフランジ３５が、車体の一部となるキャリア５（またはナックル）に対してボルト６で非回転に取り付けられる。ハブ軸２のフランジ２ａの円周数ヶ所にはボルト７が貫通装着されている。このフランジ２ａの外側面（図１の左側で、車両アウター側の面）に、前記ボルト７が貫通する状態でディスクブレーキ装置のディスクロータ８および車輪９が添わされ、これらディスクロータ８および車輪９は、前記ボルト７に螺合されるナット（図示省略）で、フランジ２ａの外側面に固定される。
【００２２】
さらに、本実施形態では、複列転がり軸受３の外輪３１の軸方向寸法が内輪部に対して短く設定されており、外輪３１のフランジ３５が軸方向中央部寄りに位置するとともに、このフランジ３５よりも車体インナー側にある円筒部３６は短寸となっている。この短寸の円筒部３６の内周には、外輪３１の軌道溝より大径の大径内周部３６ａが形成されている。また、車体インナー側の内輪３２の外周面肩部には、小径部３２ａが形成されている。
【００２３】
回転検出器４は、前記ハブ軸２の回転速度や回転方向などの回転状態を検出するものであり、パルサーリング１０と、センサ１１とを備えている。
【００２４】
パルサーリング１０は、車体インナー側の内輪３２に取り付けられる支持環１２と、この支持環１２に対して取り付けられる環状磁石１３とを有している。支持環１２は、前記内輪３２の外周面で、小径部３２ａよりも軸方向中央部寄りの位置に取り付けられている。環状磁石１３は、例えばフェライトの磁性粉末を混入したゴム材料を環状板形状にし、その円周等間隔の領域をＮ極とＳ極に交互に着磁した構成の着磁ゴムリングとされている。
【００２５】
パルサーリング１０の軸方向外方には、カバー１５が設けられている。このカバー１５は、パルサーリング１０を保護するとともに、複列転がり軸受３の車体インナー側を密封するためのもので、樹脂もしくは非磁性の金属であるステンレス鋼やアルミニウム等からなる。
【００２６】
このカバー１５は、図２に拡大して示すように、その径方向中心側でハブ軸２のかしめ部２ｄや内輪３２の突出形状に応じて軸方向外方に膨出する膨出部１５ａと、この膨出部１５ａの外径側から径方向外向きに延出する対面部１５ｂと、この対面部１５ｂの外径側に径方向に沿って連続する折り返し部１５ｃと、折り返し部１５ｃの折り返し端から外輪３１側に突出する取り付け用筒部１５ｄとを有する。
【００２７】
カバー１５の対面部１５ｂは、前記の説明からも分るように、径方向中心側の膨出部１５ａよりもパルサーリング１０側に近接している部分で、その近接した軸方向位置でパルサーリング１０の環状磁石１３に所要のエアギャップを介して対面するようになっており、径方向に環状磁石１３の幅よりも広い幅を有する。この対面部１５ｂの内径側部分は、内輪３２の外周に小径部３２ａを形成することにより、小径部３２ａの周りにできる空間内に入り込んでいる。
【００２８】
カバー１５の筒部１５ｄは、外輪３１への取り付け部であって、外輪３１の円筒部３６の大径内周部３６ａ内に嵌合されて、該円筒部３６の端面に折り返し部１５ｃが当接するまで圧入されている。
【００２９】
センサ１１は、そのセンタを環状磁石１３の検出径と一致させた状態で、かつ環状磁石１３にカバー１５を介して軸方向で対向する状態でカバー１５の対面部１５ｂの外面に設けられており、環状磁石１３の回転状態に対応した電気信号を出力する。このセンサ１１は、ホール素子や磁気抵抗素子等の磁束の流れ方向に応じて出力を変化させる検知部となる磁気検出素子と、当該磁気検出素子の出力波形を整える波形整形回路を組み込んだＩＣ等とで構成されたもので、いわゆるアクティブセンサと呼ばれるものである。このセンサ１１は、カバー１５に支持させてもよいし、カバー１５の外面に当てつけた状態で、他の固定側の部材、たとえばキャリア５やナックルに支持させてもよい。
【００３０】
上記の構成によれば、カバー１５の径方向各部分のうち、センサ１１が設けられる対面部１５ｂと、その外径側の取り付け用筒部１５ｄとが軸方向中央部寄りに位置するから、カバー１５を支持する外輪３１の円筒部３６や、パルサーリング１０を軸方向外方に長く延出させる必要がなくなり、外輪３１の軸方向寸法や、パルサーリング１０の軸方向寸法を短くすることができる。
【００３１】
外輪３１の軸方向寸法が短くなることで、装置全体の小型化、軽量化が可能になる。また、パルサーリング１０の軸方向寸法が短くなることで、このパルサーリング１０が内輪３２に若干傾いた状態で取り付けられても、パルサーリング１０先端の環状磁石１３がセンサ１１に対して位置ずれするずれ量が小さくて済み、検出不良等の不具合の発生を防止できる。
【００３２】
なお、本実施形態では、内輪３２に小径部３２ａが形成され、この小径部３２ａより軸方向中央部寄りの位置にパルサーリング１０が取り付けられているから、小径部３２ａを有しない内輪３２の外周面肩部にパルサーリング１０が取り付けられる場合に比べ、カバー１５の対面部１５ｂや、取り付け用筒部１５ｄがより軸方向中央部寄りに位置することになり、外輪３１やパルサーリング１０の軸方向寸法が一段と短くなっている。また、内輪３２に小径部３２ａを形成することでできる空間内に、対面部１５ｂの一部が入り込む構成となっているので、対面部１５ｂの径方向に沿った幅が広くなっており、この広幅の対面部１５ｂには、径の大きなセンサ１１でも、パルサーリング１０と軸方向に対向する所要の位置に設置することができる。
【００３３】
また、カバー１５の筒部１５ｄを外輪３１の円筒部３６に取り付ける際、カバー１５の折り返し部１５ｃが円筒部３６の端面に受け止められるまで、筒部１５ｄを円筒部３６の大径内周部３６ａ内に圧入すればよく、正確な嵌め付けが容易にできる。
【００３４】
〔第２実施形態〕
図３は、本発明の第２実施形態に係る転がり軸受装置の要部の断面図である。本実施形態に係る転がり軸受装置は、図１および図２に示した第１実施形態の転がり軸受装置１と基本的に同構成のもので、第１実施形態の装置１と共通する部分には同一の符号を付している。
【００３５】
この第２実施形態においても、パルサーリング１０の軸方向外方には、パルサーリング１０を保護するとともに複列転がり軸受３の車体インナー側を密封するカバー１５が設けられる。このカバー１５は、その径方向中心側にある軸方向外方への膨出部１５ａと、この膨出部１５ａの外径側から径方向外向きに延出する対面部１５ｂとを有する。一方、内輪３２の外周面肩部には小径部３２ａが形成され、この小径部３２ａより軸方向中央部寄りの位置にパルサーリング１０が取り付けられている。カバー１５の対面部１５ｂの一部は、小径部３２ａの周りにできる空間内に入り込むようになっている。
【００３６】
本実施形態の転がり軸受装置が第１実施形態の装置１と異なるのは、カバー１５の外輪３１への取り付け部の構造と、外輪３１への取り付け方である。すなわち、本実施形態の転がり軸受装置では、カバー１５の対面部１５ｂの外径側には、折り返し部を介さずに取り付け用筒部１５ｅが形成され、この筒部１５ｅが外輪３１の軸端の円筒部３６の外周面に嵌着されている。
【００３７】
パルサーリング１０とともに回転検出器４を構成するセンサ１１が、パルサーリング１０の環状磁石１３にカバー１５を介して軸方向で対向する状態でカバー１５の対面部１５ｂの外面に設けられる点は、第１実施形態と同じである。
【００３８】
上記の構成においても、カバー１５の径方向各部分のうち、センサ１１が設けられる対面部１５ｂと、その外径側の取り付け用筒部１５ｅとが軸方向中央部寄りの位置に、より具体的には、内輪３２の小径部３２ａにほぼ対応する軸方向位置にあるから、カバー１５を支持する外輪３１の円筒部３６や、パルサーリング１０を軸方向外方に長く延出させる必要がなくなり、外輪３１の軸方向寸法や、パルサーリング１０の軸方向寸法を短くすることができる。
【００３９】
なお、この場合、カバー１５の対面部１５ｂは、外輪３１の円筒部３６の外周面の径方向位置まで広がっているから、センサ１１の設置位置に余裕があり、径の大きなセンサ１１を用いたり、センサ１１をより径方向外方の位置に設けたりすることができる。
【００４０】
また、カバー１５の筒部１５ｅを外輪３１の円筒部３６に取り付ける際、カバー１５の内面が円筒部３６の端面に受け止められるまで、筒部１５ｅを円筒部３６の外周面に圧入すればよく、正確な嵌め付けが容易にできる。
【００４１】
〔第３実施形態〕
図４は、本発明の第３実施形態に係る転がり軸受装置の要部の断面図である。本実施形態に係る転がり軸受装置は、図１および図２に示した第１実施形態の転がり軸受装置と基本的に同構成のもので、第１実施形態の装置と共通する部分には同一の符号を付している。
【００４２】
この第３実施形態においても、パルサーリング１０の軸方向外方には、パルサーリング１０を保護するとともに複列転がり軸受３の車体インナー側を密封するカバー１５が設けられる。このカバー１５は、その径方向中心側にある軸方向外方への膨出部１５ａと、この膨出部１５ａの外径側から径方向外向きに延出する対面部１５ｂと、対面部１５ｂの外径側に形成されて外輪３１側に突出する取り付け用筒部１５ｄとを有するが、膨出部１５ａは、ハブ軸２のかしめ部２ｄのみの突出形状に応じて膨出した形状で、第１実施形態や第２実施形態の膨出部１５ａと比べると、軸方向外方への膨出量が少ない。このカバー１５は、その取り付け用筒部１５ｄを外輪３１の円筒部３６の大径内周部３６ａ内に圧入することで、外輪３１に取り付けられる。
【００４３】
他に、この実施形態の転がり軸受が、第１実施形態の装置１や第２実施形態の装置と異なる点は、内輪３２の外周面に小径部が形成されておらず、その内輪３２の外周面肩部にパルサーリング１０が取り付けられていることである。
【００４４】
センサ１１が、パルサーリング１０の環状磁石１３にカバー１５を介して軸方向で対向する状態でカバー１５の対面部１５ｂの外面に設けられる点は、第１実施形態や第２実施形態と同じである。
【００４５】
上記構成の転がり軸受装置においても、カバー１５の径方向各部分のうち、センサ１１が設けられる対面部１５ｂと、その外径側の取り付け用筒部１５ｄとが軸方向中央部寄りに位置するから、カバー１５を支持する外輪３１の円筒部３６や、パルサーリング１０を軸方向外方に長く延出させる必要がなくなり、外輪３１の軸方向寸法や、パルサーリング１０の軸方向寸法を短くすることができる。
【００４６】
〔その他の実施形態〕
上記各実施形態では、カバー１５の外径側に取り付け用筒部１５ｄ（１５ｅ）を形成して、この筒部１５ｄ（１５ｅ）を外輪３１の軸端の円筒部３６の内周面もしくは外周面に嵌着するように構成したが、カバー１５の外輪３１への取り付け部の形状や、外輪３１への取り付け方は、これらに限定されるものではなく、例えば、外輪３１の軸方向端面に、取り付け用筒部に対応する環状溝を形成して、この環状溝に筒部を圧入するようにしてもよい。また、カバー１５の外径側に、フランジ状に径方向外向きに延出する取り付け用縁部を形成して、この縁部を外輪３１の軸方向端面にあてがって、ボルト等の締結手段で取り付けるようにしてもよい。
【００４７】
また、上記各実施形態では、センサ１１をカバー１５の外面に当て付けた状態で取り付けたが、センサ１１とカバー１５の外面との間に隙間を設けてもよい。
【００４８】
さらに、上記各実施形態では、従動輪用で内輪回転型の転がり軸受装置を例示したが、本発明は、駆動輪用の転がり軸受装置にも実施可能である。駆動輪用の転がり軸受装置は、従動輪用の転がり軸受装置とハブ軸の構造が異なる等、種々の違いはあるが、パルサーリング１０やカバー１５、センサ１１等を設ける部分の構成については、各実施形態において図示した構成が駆動輪用の転がり軸受装置にも適用できるので、駆動輪用の転がり軸受装置についての実施形態は、特に図示しない。
【００４９】
このほか、上記の各実施形態では、パルサーリング１０として磁石タイプのものを示したが、櫛歯形状の金属環もしくは円周数ヶ所に透孔を設けた金属環からなる磁性片タイプのものでもよい。また、パルサーリング１０の軸方向外方を覆うカバー１５は、磁性を有する金属で構成することも可能である。
【００５０】
【発明の効果】
本発明によれば、カバーの径方向各部分のうち、センサが設けられる対面部や、外輪への取り付け部が軸方向中央部寄りに位置するから、カバーを支持する外輪の軸端部や、パルサーリングを軸方向外方に長く延出させる必要がなくなり、外輪の軸方向寸法や、パルサーリングの軸方向寸法を短くすることができる。外輪の軸方向寸法が短くなることで、装置全体の小型化、軽量化が可能になる。
【００５１】
また、パルサーリングの軸方向寸法が短くなることで、環状磁石等、パルサーリングの本体部分のセンサに対する位置ずれを少なくして、検出不良等の不具合の発生を防止できる。
【図面の簡単な説明】
【図１】本発明の第１実施形態に係る転がり軸受装置の全体の断面図。
【図２】図１の装置の要部の拡大断面図。
【図３】本発明の第２実施形態に係る転がり軸受装置の要部の断面図。
【図４】本発明の第３実施形態に係る転がり軸受装置の要部の断面図。
【図５】従来の転がり軸受装置の半部の断面図。
【符号の説明】
１　　　転がり軸受装置（全体）
２　　　ハブ軸
３　　　複列転がり軸受
３１　外輪、　　　３２　内輪、　　３３　玉（転動体）、
３６　　外輪の円筒部
１０　　　パルサーリング
１１　　　センサ
１５　　　カバー
１５ａ　膨出部、　１５ｂ　対面部、　１５ｄ　取り付け用筒部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rolling bearing device.
[0002]
[Prior art]
2. Description of the Related Art In an automobile or the like, a rolling detector device for supporting a wheel may be equipped with a rotation detector in order to control an anti-lock brake system (ABS) or the like.
[0003]
The rotation detector has a configuration including a pulsar ring and a sensor. The pulsar ring is mounted on the rotating wheel of the rolling bearing device, and the sensor is provided on the fixed wheel side so as to face the pulsar ring. The rotation speed of the pulsar ring that rotates synchronously with the rotating wheel is detected by a sensor, and the rotation state such as the rotation speed and the rotation direction of the wheel is detected.
[0004]
Generally, in the pulsar ring, a magnetic piece type composed of a comb-shaped metal ring or a metal ring provided with through holes at several places around the circumference, and magnetic poles are alternately arranged in a circumferential direction with respect to a metal support ring. There is a magnet type in which a ring magnet is attached.
[0005]
As a conventional example of a rolling bearing device provided with a rotation detector, FIG. 5 shows a rolling bearing device for supporting wheels. In the figure, reference numeral 41 denotes the whole rolling bearing device, reference numeral 42 denotes a hub shaft, reference numeral 43 denotes an outer ring which is a fixed ring, reference numeral 44 denotes a pair of inner rings which are rotating wheels, and reference numeral 45 denotes a ball as a rolling element.
[0006]
The hub axle 42 has a flange 42a at one end in the axial direction (the left end in the drawing, on the outer side of the vehicle body), and a disk rotor and a wheel (both not shown) of a disk brake device are attached to the flange 42a. An inner ring 44 is fitted on the outer periphery of the hub shaft 42. The inner ring 44 is fixed on the outer peripheral portion of the hub shaft 42 by a caulking portion 42b at the shaft end of the hub shaft 42. The outer ring 43 has a flange 43a at the other end in the axial direction (the right end in the drawing, the inner side of the vehicle body), and the flange 43a is attached to a carrier 46 (which may be a knuckle) that is a part of the vehicle body.
[0007]
The rotation detector 47 includes a pulsar ring 48 and a sensor 49. The pulsar ring 48 is fitted to the outer peripheral portion of the inner ring 44 on the vehicle body inner side of the pair of inner rings 44, 44. Reference numeral 50 denotes a cover for covering the pulsar ring 48 in the axial direction to protect the pulsar ring 48, and is attached to the inner peripheral surface of the outer ring 43 by press fitting. The sensor 49 is provided on the outer surface of the cover 50, and the sensor 49 faces the pulsar ring 48 in the axial direction via the cover 50.
[0008]
[Problems to be solved by the invention]
Meanwhile, in the conventional rolling bearing device 41 with a rotation detector, the cover 50 needs to be provided at a position further axially outward than the shaft end of the rotating member so as not to contact the rotating member such as the inner ring 44. . According to the conventional example shown in the drawing, it is necessary to dispose the cover 50 at the axial end of the caulking portion 42b at the shaft end of the hub shaft 42.
[0009]
As described above, when the cover 50 is disposed at a position deviated outward in the axial direction, it becomes necessary to elongate the axial end of the outer ring 43 in the axial direction in order to support the cover 50. In addition, the dimension setting of the outer ring 43 is restricted. Further, if the axial dimension of the outer ring 43 is increased in accordance with the above-mentioned necessity, the axial dimension of the entire device is also increased to increase the size and increase the weight.
[0010]
On the other hand, the pulsar ring 48 constituting the rotation detector 47 extends axially long from the inner ring 44 to which it is attached to a position close to the cover 50. Depending on how the pulsar ring 50 is attached to the inner ring 44, the main body at the tip (in the case of a magnet-type pulsar ring, an annular magnet) is detected by the sensor 49 depending on how the pulsar ring 50 is attached to the inner ring 44. The rotation may be out of the range, and rotation detection may be hindered.
[0011]
Therefore, a main object of the present invention is to reduce the weight and size of the device without impairing the function of rotation detection.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an outer ring that is a fixed wheel, an inner ring rotatably supported on the outer ring via a rolling element, and a rotation detection attached to one axial end of the inner ring. A pulsar ring, and a cover attached to the outer ring so as to cover the outer side of the pulsar ring in the axial direction, and of the radial portions of the cover, a facing portion facing the pulsar ring in the axial direction, The attachment portion to the outer ring provided on the outer diameter side constitutes a rolling bearing device that is closer to the pulsar ring side than the portion on the radial center side.
[0013]
According to the above configuration, of the radial portions of the cover, the facing portion on which the sensor is provided and the portion to be attached to the outer ring are located closer to the center in the axial direction. It is not necessary to extend the portion and the pulsar ring outwardly in the axial direction, so that the axial dimension of the outer race and the axial dimension of the pulsar ring can be reduced. By reducing the axial dimension of the outer ring, the size and weight of the entire device can be reduced. In addition, since the axial dimension of the pulsar ring is reduced, the displacement of the main body portion of the pulsar ring, such as an annular magnet, with respect to the sensor is reduced, and the occurrence of problems such as detection failure can be prevented.
[0014]
Note that the rolling bearing device having the above configuration may not include a sensor corresponding to the pulsar ring, or the sensor may be provided at a required position on the outer surface of the facing portion of the cover as described in claim 2. May be used.
[0015]
In the rolling bearing device having the above-described configuration, the pulsar ring may be attached to the outer peripheral surface shoulder of the inner ring, but a small-diameter portion is formed on the outer peripheral shoulder of the inner ring, and the shaft is smaller than the small-diameter portion. A pulsar ring may be attached to a position near the center in the direction, and a part of the facing portion may enter a space around the small diameter portion.
[0016]
According to this configuration, the facing portion of the cover and the attachment portion to the outer ring are located closer to the center in the axial direction, and the outer ring and the pulsar ring are further reduced in axial dimension. Also, by forming a small diameter portion on the inner ring, a part of the facing portion enters into a space formed around the small diameter portion, so that the width along the radial direction of the facing portion is widened. It can be installed at a required position facing the pulsar ring in the axial direction.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
[First Embodiment]
1 and 2 show a first embodiment of the present invention. Here, an inner ring rotating type rolling bearing device used on a driven wheel side of an automobile will be described as an example. FIG. 1 is an overall sectional view of the rolling bearing device according to the first embodiment, and FIG. 2 is an enlarged sectional view of a main part of the device of FIG. The illustrated rolling bearing device 1 includes a hub shaft 2, a double-row rolling bearing 3, and a rotation detector 4.
[0018]
A flange 2a extending radially outward is provided near one axial end of the hub shaft 2 (a position near the left end in FIG. 1, on the outer side of the vehicle body). In the hub shaft 2, a double-row rolling bearing 3 is externally provided in a region closer to the vehicle inner side than the flange 2a.
[0019]
The double-row rolling bearing 3 is, here, a double-row outward-facing angular ball bearing, which is fitted on a single outer ring 31 having two rows of raceways and a small-diameter portion 2b of the hub axle 2 having a single row of raceways. , And a plurality of balls 33,... Arranged in two rows, and two crowned retainers 34, 34. The inner race portion formed by the portion 2c is the other inner ring on the vehicle body outer side.
[0020]
A flange 35 extending radially outward is provided on the outer periphery of the outer ring 31, and a cylindrical portion 36 protruding axially outward is provided on the vehicle body inner side with respect to the flange 35. Reference numeral 2d denotes a caulking portion formed at the end of the hub axle 2 on the vehicle body inner side, and fixes one inner ring 32 at a required position on the small diameter portion 2b of the hub axle 2. The inner ring 32 on the small diameter portion 2b of the hub shaft 2 may be fixed by a nut screwed to an end of the small diameter portion 2b.
[0021]
Then, the flange 35 of the outer race 31 is non-rotatably attached to the carrier 5 (or knuckle), which is a part of the vehicle body, with the bolt 6. Bolts 7 are mounted through several places on the circumference of the flange 2a of the hub shaft 2. A disk rotor 8 and a wheel 9 of a disk brake device are attached to an outer surface of the flange 2a (a surface on the vehicle outer side on the left side in FIG. 1) with the bolt 7 penetrating therethrough. Is a nut (not shown) screwed to the bolt 7, and is fixed to the outer surface of the flange 2a.
[0022]
Further, in the present embodiment, the axial dimension of the outer race 31 of the double row rolling bearing 3 is set shorter than the inner race part, and the flange 35 of the outer race 31 is located closer to the center in the axial direction. The cylindrical portion 36 closer to the vehicle body inner side is shorter. A large-diameter inner peripheral portion 36 a having a diameter larger than the raceway groove of the outer race 31 is formed on the inner periphery of the short cylindrical portion 36. A small-diameter portion 32a is formed at the shoulder of the outer peripheral surface of the inner race 32 on the inner side of the vehicle body.
[0023]
The rotation detector 4 detects a rotation state such as a rotation speed and a rotation direction of the hub shaft 2, and includes a pulsar ring 10 and a sensor 11.
[0024]
The pulsar ring 10 includes a support ring 12 attached to the inner ring 32 on the vehicle body inner side, and an annular magnet 13 attached to the support ring 12. The support ring 12 is mounted on the outer peripheral surface of the inner ring 32 at a position closer to the axial center than the small diameter portion 32a. The annular magnet 13 is a magnetized rubber ring having a configuration in which, for example, a rubber material mixed with magnetic powder of ferrite is formed in an annular plate shape, and regions at equal circumferential intervals are alternately magnetized to N poles and S poles. .
[0025]
A cover 15 is provided outside the pulsar ring 10 in the axial direction. The cover 15 protects the pulsar ring 10 and seals the inner side of the double row rolling bearing 3 on the vehicle body side, and is made of resin or a non-magnetic metal such as stainless steel or aluminum.
[0026]
As shown in an enlarged manner in FIG. 2, the cover 15 has a bulging portion 15a which bulges outward in the axial direction according to the caulking portion 2d of the hub shaft 2 and the protruding shape of the inner ring 32 at the center in the radial direction. A facing portion 15b extending radially outward from the outer diameter side of the bulging portion 15a; a folded portion 15c radially continuous with the outer diameter side of the facing portion 15b; and a folded portion 15c. And a mounting tubular portion 15d protruding from the end toward the outer ring 31.
[0027]
As can be seen from the above description, the facing portion 15b of the cover 15 is a portion closer to the pulsar ring 10 side than the bulging portion 15a on the radial center side, and the pulsar ring is located at the close axial position. It faces the ten annular magnets 13 via a required air gap, and has a width larger than the width of the annular magnets 13 in the radial direction. The inner diameter side portion of the facing portion 15b enters a space formed around the small diameter portion 32a by forming the small diameter portion 32a on the outer periphery of the inner ring 32.
[0028]
The cylindrical portion 15 d of the cover 15 is a portion to be attached to the outer ring 31. The cylindrical portion 15 d is fitted into the large-diameter inner peripheral portion 36 a of the cylindrical portion 36 of the outer ring 31, and the folded portion 15 c contacts the end surface of the cylindrical portion 36. Pressed into contact.
[0029]
The sensor 11 is provided on the outer surface of the facing portion 15b of the cover 15 in a state where its center is made to match the detection diameter of the annular magnet 13 and in a state where the sensor 11 faces the annular magnet 13 in the axial direction via the cover 15. And outputs an electric signal corresponding to the rotation state of the annular magnet 13. The sensor 11 includes a magnetic detection element such as a Hall element and a magnetic resistance element serving as a detection unit that changes the output in accordance with the flow direction of magnetic flux, an IC incorporating a waveform shaping circuit that adjusts an output waveform of the magnetic detection element, and the like. This is a so-called active sensor. The sensor 11 may be supported by the cover 15 or may be supported by another fixed-side member, for example, the carrier 5 or a knuckle, in a state where the sensor 11 is applied to the outer surface of the cover 15.
[0030]
According to the above configuration, of the radial portion of the cover 15, the facing portion 15 b on which the sensor 11 is provided and the mounting cylindrical portion 15 d on the outer diameter side thereof are located closer to the center in the axial direction. It is not necessary to extend the cylindrical portion 36 of the outer race 31 supporting the pulsar ring 10 and the pulsar ring 10 to the outside in the axial direction, so that the axial dimension of the outer race 31 and the axial dimension of the pulsar ring 10 can be reduced. .
[0031]
Since the axial dimension of the outer ring 31 is reduced, the entire device can be reduced in size and weight. Further, since the axial dimension of the pulsar ring 10 is reduced, the annular magnet 13 at the tip of the pulsar ring 10 is displaced with respect to the sensor 11 even when the pulsar ring 10 is attached to the inner race 32 with a slight inclination. The amount of displacement can be small, and the occurrence of problems such as detection failure can be prevented.
[0032]
In the present embodiment, the small diameter portion 32a is formed in the inner ring 32, and the pulsar ring 10 is attached at a position closer to the center in the axial direction than the small diameter portion 32a, so that the outer circumference of the inner ring 32 without the small diameter portion 32a is provided. As opposed to the case where the pulsar ring 10 is attached to the surface shoulder, the facing portion 15b of the cover 15 and the mounting cylindrical portion 15d are located closer to the center in the axial direction, and the axial direction of the outer ring 31 and the pulsar ring 10 The dimensions are much shorter. In addition, since a part of the facing portion 15b enters a space formed by forming the small-diameter portion 32a in the inner ring 32, the width of the facing portion 15b along the radial direction is wide. In the wide facing portion 15b, even the sensor 11 having a large diameter can be installed at a required position facing the pulsar ring 10 in the axial direction.
[0033]
When attaching the cylindrical portion 15d of the cover 15 to the cylindrical portion 36 of the outer race 31, the cylindrical portion 15d is attached to the large-diameter inner peripheral portion 36a of the cylindrical portion 36 until the folded portion 15c of the cover 15 is received by the end surface of the cylindrical portion 36. It is sufficient to press-fit the inside, and accurate fitting can be easily performed.
[0034]
[Second embodiment]
FIG. 3 is a sectional view of a main part of a rolling bearing device according to a second embodiment of the present invention. The rolling bearing device according to the present embodiment has basically the same configuration as the rolling bearing device 1 according to the first embodiment shown in FIGS. 1 and 2, and the portions common to the device 1 according to the first embodiment include The same reference numerals are given.
[0035]
Also in the second embodiment, a cover 15 that protects the pulsar ring 10 and seals the inner side of the double row rolling bearing 3 on the vehicle body is provided outside the pulsar ring 10 in the axial direction. The cover 15 has an axially outwardly bulging portion 15a at the center in the radial direction, and a facing portion 15b extending radially outward from the outer diameter side of the bulging portion 15a. On the other hand, a small diameter portion 32a is formed on the outer peripheral surface shoulder of the inner ring 32, and the pulsar ring 10 is mounted at a position closer to the center in the axial direction than the small diameter portion 32a. A part of the facing portion 15b of the cover 15 enters into a space formed around the small diameter portion 32a.
[0036]
The rolling bearing device according to the present embodiment differs from the device 1 according to the first embodiment in the structure of a portion where the cover 15 is attached to the outer ring 31 and how to attach the cover 15 to the outer ring 31. That is, in the rolling bearing device of the present embodiment, a mounting cylindrical portion 15 e is formed on the outer diameter side of the facing portion 15 b of the cover 15 without passing through the folded portion, and this cylindrical portion 15 e is formed on the shaft end of the outer race 31. It is fitted on the outer peripheral surface of the cylindrical portion 36.
[0037]
The point that the sensor 11 constituting the rotation detector 4 together with the pulsar ring 10 is provided on the outer surface of the facing portion 15b of the cover 15 in a state in which the sensor 11 faces the annular magnet 13 of the pulsar ring 10 via the cover 15 in the axial direction. This is the same as in the first embodiment.
[0038]
Also in the above configuration, of the radial portion of the cover 15, the facing portion 15 b on which the sensor 11 is provided and the mounting cylindrical portion 15 e on the outer diameter side are more specifically located at positions closer to the axial center. Is located at an axial position substantially corresponding to the small-diameter portion 32a of the inner ring 32, so that it is not necessary to extend the cylindrical portion 36 of the outer ring 31 supporting the cover 15 and the pulsar ring 10 long outward in the axial direction. The axial dimension of the outer race 31 and the axial dimension of the pulsar ring 10 can be reduced.
[0039]
In this case, since the facing portion 15b of the cover 15 extends to the radial position on the outer peripheral surface of the cylindrical portion 36 of the outer race 31, there is a margin in the installation position of the sensor 11, and the sensor 11 having a large diameter may be used. The sensor 11 can be provided at a more radially outward position.
[0040]
When attaching the cylindrical portion 15 e of the cover 15 to the cylindrical portion 36 of the outer race 31, the cylindrical portion 15 e may be pressed into the outer peripheral surface of the cylindrical portion 36 until the inner surface of the cover 15 is received by the end surface of the cylindrical portion 36. Accurate fitting can be easily performed.
[0041]
[Third embodiment]
FIG. 4 is a sectional view of a main part of a rolling bearing device according to a third embodiment of the present invention. The rolling bearing device according to the present embodiment has basically the same configuration as the rolling bearing device of the first embodiment shown in FIGS. 1 and 2, and the same parts as those of the device of the first embodiment have the same configuration. Signs are attached.
[0042]
Also in the third embodiment, a cover 15 that protects the pulsar ring 10 and seals the inner side of the double-row rolling bearing 3 on the vehicle body is provided outside the pulsar ring 10 in the axial direction. The cover 15 has an axially outward bulging portion 15a at the radial center thereof, a facing portion 15b extending radially outward from an outer diameter side of the bulging portion 15a, and a facing portion 15b. And a mounting tubular portion 15d formed on the outer diameter side of the hub shaft 2 and protruding toward the outer ring 31. The bulging portion 15a has a shape bulging in accordance with the protruding shape of only the caulking portion 2d of the hub shaft 2, The amount of swelling outward in the axial direction is smaller than that of the swelling portion 15a of the first embodiment or the second embodiment. The cover 15 is attached to the outer ring 31 by press-fitting the mounting tubular portion 15 d into the large-diameter inner peripheral portion 36 a of the cylindrical portion 36 of the outer ring 31.
[0043]
In addition, the rolling bearing of this embodiment is different from the device 1 of the first embodiment and the device of the second embodiment in that a small diameter portion is not formed on the outer peripheral surface of the inner ring 32, That is, the pulsar ring 10 is attached to the shoulder.
[0044]
The point that the sensor 11 is provided on the outer surface of the facing portion 15b of the cover 15 in a state in which the sensor 11 faces the annular magnet 13 of the pulsar ring 10 via the cover 15 in the axial direction is the same as in the first embodiment and the second embodiment. is there.
[0045]
Also in the rolling bearing device having the above configuration, the facing portion 15b on which the sensor 11 is provided and the mounting cylindrical portion 15d on the outer diameter side are located closer to the center in the axial direction among the radial portions of the cover 15. Therefore, it is not necessary to extend the cylindrical portion 36 of the outer ring 31 supporting the cover 15 and the pulsar ring 10 to the outside in the axial direction, thereby reducing the axial dimension of the outer ring 31 and the axial dimension of the pulsar ring 10. Can be.
[0046]
[Other embodiments]
In each of the above embodiments, the mounting cylindrical portion 15d (15e) is formed on the outer diameter side of the cover 15, and the cylindrical portion 15d (15e) is formed on the inner peripheral surface or the outer peripheral surface of the cylindrical portion 36 at the axial end of the outer ring 31. However, the shape of the attachment portion of the cover 15 to the outer ring 31 and the method of attaching the cover 15 to the outer ring 31 are not limited thereto. An annular groove corresponding to the mounting cylinder may be formed, and the cylinder may be press-fitted into the annular groove. Further, a mounting edge portion extending radially outward in a flange shape is formed on the outer diameter side of the cover 15, and this edge portion is applied to the axial end surface of the outer ring 31 and is fastened by a fastening means such as a bolt. You may make it attach.
[0047]
Further, in each of the above embodiments, the sensor 11 is attached to the outer surface of the cover 15 while being attached, but a gap may be provided between the sensor 11 and the outer surface of the cover 15.
[0048]
Further, in each of the above embodiments, the inner ring rotating type rolling bearing device for the driven wheel has been exemplified. However, the present invention can be applied to a rolling bearing device for a driving wheel. The rolling bearing device for the drive wheel has various differences such as a different structure of the hub axle from the rolling bearing device for the driven wheel, but the configuration of the portion where the pulsar ring 10, the cover 15, the sensor 11, and the like are provided is described below. Since the configuration shown in each embodiment can be applied to the rolling bearing device for the driving wheel, the embodiment of the rolling bearing device for the driving wheel is not particularly shown.
[0049]
In addition, in each of the above embodiments, the magnet type is shown as the pulsar ring 10, but a magnetic piece type made of a comb-shaped metal ring or a metal ring provided with through holes at several places around the circumference may be used. Good. Further, the cover 15 that covers the outside of the pulsar ring 10 in the axial direction can be made of a metal having magnetism.
[0050]
【The invention's effect】
According to the present invention, among the radial portions of the cover, the facing portion where the sensor is provided and the mounting portion to the outer ring are located near the axial center, so the shaft end of the outer ring supporting the cover, It is not necessary to extend the pulsar ring outward long in the axial direction, and the axial dimension of the outer race and the axial dimension of the pulsar ring can be reduced. By reducing the axial dimension of the outer ring, the size and weight of the entire device can be reduced.
[0051]
In addition, since the axial dimension of the pulsar ring is reduced, the displacement of the main body portion of the pulsar ring, such as an annular magnet, with respect to the sensor is reduced, and the occurrence of problems such as detection failure can be prevented.
[Brief description of the drawings]
FIG. 1 is an overall sectional view of a rolling bearing device according to a first embodiment of the present invention.
FIG. 2 is an enlarged sectional view of a main part of the apparatus of FIG.
FIG. 3 is a sectional view of a main part of a rolling bearing device according to a second embodiment of the present invention.
FIG. 4 is a sectional view of a main part of a rolling bearing device according to a third embodiment of the present invention.
FIG. 5 is a cross-sectional view of a half of a conventional rolling bearing device.
[Explanation of symbols]
1 Rolling bearing device (whole)
2 hub shaft 3 double row rolling bearing 31 outer ring, 32 inner ring, 33 balls (rolling element),
36 Cylindrical part of outer ring 10 Pulser ring 11 Sensor 15 Cover 15a Swelling part, 15b Facing part, 15d Mounting cylinder part

Claims (3)

固定輪である外輪と、この外輪に転動体を介して回転可能に支持される内輪と、この内輪の軸方向一端側に取り付けられる回転検出用のパルサーリングと、このパルサーリングの軸方向外方を覆うよう前記外輪に取り付けられるカバーとを備え、
前記カバーの径方向各部分のうち、前記パルサーリングと軸方向に対向する対面部と、その外径側に設けられる外輪への取り付け部とは、径方向中心側の部分よりもパルサーリング側に近接している転がり軸受装置。An outer ring that is a fixed ring, an inner ring rotatably supported by the outer ring via a rolling element, a pulsar ring for rotation detection attached to one axial end of the inner ring, and an axially outer portion of the pulsar ring. A cover attached to the outer ring so as to cover
Of the radial portions of the cover, the facing portion that faces the pulsar ring in the axial direction, and the attachment portion to the outer ring provided on the outer diameter side is closer to the pulsar ring side than the portion on the radial center side. Rolling bearing device in close proximity. 請求項１の記載の転がり軸受装置において、
前記カバーの対面部の外面に、該カバーを介して前記パルサーリングと軸方向に対向するセンサが設けられている転がり軸受装置。The rolling bearing device according to claim 1,
A rolling bearing device, wherein a sensor facing the pulsar ring in the axial direction is provided on an outer surface of a facing portion of the cover via the cover. 請求項１または請求項２の記載の転がり軸受装置において、
前記内輪の外周面肩部には小径部が形成され、この小径部よりも軸方向中央部寄りの位置にパルサーリングが取り付けられ、前記小径部の周りの空間に前記対面部の一部が入り込んでいる転がり軸受装置。The rolling bearing device according to claim 1 or 2,
A small diameter portion is formed at the shoulder of the outer peripheral surface of the inner ring, and a pulsar ring is attached at a position closer to the axial center than the small diameter portion, and a part of the facing portion enters the space around the small diameter portion. Rolling bearing device.
JP2002246766A 2002-08-27 2002-08-27 Rolling bearing device Expired - Fee Related JP4114438B2 (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007211989A (en) * 2007-05-11 2007-08-23 Ntn Corp Bearing device for wheel
JP2010151277A (en) * 2008-12-26 2010-07-08 Ntn Corp Wheel bearing device with rotation speed detector
US7901143B2 (en) 2005-05-12 2011-03-08 Ntn Corporation Wheel support bearing assembly
WO2011034134A1 (en) * 2009-09-17 2011-03-24 Ntn株式会社 Bearing device for a wheel, equipped with a rotational-speed measurement device
JP2011079512A (en) * 2009-09-08 2011-04-21 Nsk Ltd Rolling bearing unit with rotating speed detecting device
JP2011084265A (en) * 2009-09-17 2011-04-28 Ntn Corp Bearing device for wheel
JP2011117583A (en) * 2009-12-07 2011-06-16 Ntn Corp Bearing device for wheel, equipped with rotational-speed detection device
JP2011117549A (en) * 2009-12-04 2011-06-16 Ntn Corp Bearing device for wheel, equipped with rotational-speed detection device
JP2013011354A (en) * 2012-08-09 2013-01-17 Nsk Ltd Rolling bearing unit for driven wheel with rotational speed detection device
JP2014196830A (en) * 2014-07-17 2014-10-16 日本精工株式会社 Rolling bearing unit with encoder
JP2020076420A (en) * 2018-11-05 2020-05-21 日本精工株式会社 Hub unit bearing

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7901143B2 (en) 2005-05-12 2011-03-08 Ntn Corporation Wheel support bearing assembly
US8092095B2 (en) 2005-05-12 2012-01-10 Ntn Corporation Wheel support bearing assembly
JP2007211989A (en) * 2007-05-11 2007-08-23 Ntn Corp Bearing device for wheel
JP2010151277A (en) * 2008-12-26 2010-07-08 Ntn Corp Wheel bearing device with rotation speed detector
JP2011079512A (en) * 2009-09-08 2011-04-21 Nsk Ltd Rolling bearing unit with rotating speed detecting device
US8393795B2 (en) 2009-09-17 2013-03-12 Ntn Corporation Wheel bearing apparatus incorporated with a rotational speed detecting apparatus
WO2011034134A1 (en) * 2009-09-17 2011-03-24 Ntn株式会社 Bearing device for a wheel, equipped with a rotational-speed measurement device
JP2011084265A (en) * 2009-09-17 2011-04-28 Ntn Corp Bearing device for wheel
JP2011117549A (en) * 2009-12-04 2011-06-16 Ntn Corp Bearing device for wheel, equipped with rotational-speed detection device
JP2011117583A (en) * 2009-12-07 2011-06-16 Ntn Corp Bearing device for wheel, equipped with rotational-speed detection device
JP2013011354A (en) * 2012-08-09 2013-01-17 Nsk Ltd Rolling bearing unit for driven wheel with rotational speed detection device
JP2014196830A (en) * 2014-07-17 2014-10-16 日本精工株式会社 Rolling bearing unit with encoder
JP2020076420A (en) * 2018-11-05 2020-05-21 日本精工株式会社 Hub unit bearing

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