JP3988557B2 - Rolling bearing device - Google Patents

Rolling bearing device Download PDF

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Publication number
JP3988557B2
JP3988557B2 JP2002208149A JP2002208149A JP3988557B2 JP 3988557 B2 JP3988557 B2 JP 3988557B2 JP 2002208149 A JP2002208149 A JP 2002208149A JP 2002208149 A JP2002208149 A JP 2002208149A JP 3988557 B2 JP3988557 B2 JP 3988557B2
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Japan
Prior art keywords
outer ring
ring member
cap
circumferential surface
peripheral surface
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Expired - Fee Related
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JP2002208149A
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Japanese (ja)
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JP2004052832A (en
Inventor
照之 脇阪
洋一 津崎
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JTEKT Corp
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JTEKT Corp
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0073—Hubs characterised by sealing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B7/00—Wheel cover discs, rings, or the like, for ornamenting, protecting, venting, or obscuring, wholly or in part, the wheel body, rim, hub, or tyre sidewall, e.g. wheel cover discs, wheel cover discs with cooling fins
    • B60B7/0013—Hub caps
    • 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
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/768—Sealings of ball or roller bearings between relatively stationary parts, i.e. static seals
    • 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
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/783—Details of the sealing or parts thereof, e.g. geometry, material of the mounting region
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—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
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Of Bearings (AREA)

Description

【０００１】
【発明の属する産業上の利用分野】
本発明は、転がり軸受装置に関する。
【０００２】
【従来技術】
転がり軸受装置として、例えば、自動車の車体に車輪を回転自在に支持するものがある。この種の転がり軸受装置として、実用新案登録第２５７４２６号（従来例１とする）や、特開平９−１３３１２９号（従来例２とする）に示すようなものがある。
【０００３】
従来例１では、外輪の車両インナー側開口にその内径部を隠蔽するキャップを取り付けて該開口から泥水や洗浄水等が侵入するのを防止している。このキャップは、金属製であり、金属製の外輪の内周面の車両インナー側に内嵌されている。
【０００４】
この場合、金属製の外輪と、金属製のキャップとをタイトフィットさせているが、それでも、外輪とキャップとの嵌合面を伝って泥水や洗浄水等が侵入しやすい。そこで、従来例１では、外輪とキャップとの嵌合面において軸方向途中にＯリングを介装させている。このＯリングは、外輪の内周面に設けられた溝に収納されている。
【０００５】
従来例２では、従来例１と同様に、外輪の車両インナー側開口にキャップを取り付けているが、このキャップには、製作が容易で安価な樹脂が用いられ、金属製の外輪の内周面の車両インナー側に内嵌されている。
【０００６】
この場合、金属製の外輪と、樹脂製のキャップとの線膨張係数が異なるため、温度変化により外輪が膨張したとき、その膨張量にキャップの膨張量が追随できず、キャップと外輪との嵌合しめしろが減少する傾向となる。そのため、外輪とキャップとの嵌合面を伝って泥水や洗浄水等が浸入しやすくなる。そこで、従来例２では、外輪とキャップとの嵌合面において軸方向途中にＯリングが介装されている。このＯリングは、キャップの外周面に設けられた溝に収納されている。
【０００７】
【発明が解決しようとする課題】
上記従来例１，２では、共に、外輪とキャップとの嵌合領域の軸方向途中にＯリングの設置スペースを確保する必要があり、転がり軸受装置全体の大型化を余儀なくされている。
【０００８】
【課題を解決するための手段】
本発明の転がり軸受装置は、金属製の外輪部材と、前記外輪部材と同心に配置された内輪部材と、前記両部材の環状空間に設けられた複数の転動体と、前記外輪部材の内周面の一端側に装着されて前記外輪部材の一端側を閉塞する樹脂製のキャップとを備え、前記外輪部材の内周面の一端側が、拡径された大径円周面とされているとともに、前記外輪部材の内周面と大径円周面との間に軸方向に対して垂直に形成された段部端面と大径円周面との間の入り隅に、大径円周面と段部端面とに対してそれぞれ径方向および軸方向に拡がる溝部が設けられており、前記キャップの先端に、前記外輪部材の大径円周面に対して所定の締め代を持つ状態で内嵌装着される円筒部が設けられており、この円筒部の外周面の先端側角部に先端へ向けて漸次縮径するテーパ状面取りが設けられており、前記溝部内にＯリングが配置されていて、このＯリングが、前記溝部と前記テーパ状面取りとで圧縮されている。
【０００９】
この場合、外輪部材の溝部と、キャップの円筒部の面取りとの対向隙間にＯリングを設置しており、このＯリングをこの対向隙間において所定量圧縮できるようにしているので、外輪部材の大径円周面と、キャップの円筒部との嵌合面を伝って泥水などが浸入することを防止できる。また、従来例のように、外輪部材とキャップとの嵌合部分の軸方向途中にＯリングを設置するための溝を設ける必要がないため、外輪部材およびキャップの軸方向寸法を短縮化でき、転がり軸受装置の小型化が可能となる。
【００１０】
また、本発明の転がり軸受装置は、金属製の外輪部材と、前記外輪部材と同心に配置された内輪部材と、前記両部材の環状空間に設けられた複数の転動体と、前記外輪部材の内周面の一端側に装着されて前記外輪部材の一端側を閉塞するキャップとを備え、前記外輪部材の内周面の一端側が、拡径された大径円周面とされているとともに、前記外輪部材の内周面と大径円周面との間に軸方向に対して垂直に形成された段部端面と大径円周面との間の入り隅に、大径円周面と段部端面とに対してそれぞれ径方向および軸方向に拡がる溝部が設けられており、前記キャップが、有底円筒形に形成された樹脂胴体と、この樹脂胴体の円筒部の外径側に外周面が露出した状態で埋め込まれる金属環とを有する複合構成になっており、このキャップの樹脂胴体の円筒部の外周面の先端側角部に先端へ向けて漸次縮径するテーパ状面取りが設けられており、このキャップの前記金属環が、前記外輪部材の大径円周面に対して所定の締め代を持つ状態で内嵌装着されており、前記溝部内にＯリングが配置されていて、このＯリングが、前記溝部と前記テーパ状面取りとで圧縮されており、かつ、前記金属環と前記樹脂胴体の前記円筒部との接合面の端縁が前記Ｏリングと前記テーパ状面取りとの接触領域に位置されているか、または前記接触領域よりも外径側に位置されている。
【００１１】
この場合、キャップの金属環を、金属製の外輪部材の大径円周面と嵌合することにより、互いに金属同士の嵌合構造としているから、温度変化に関係なくキャップの取り付け強度を向上することができる。しかも、金属環と、樹脂胴体の円筒部との接合面の端縁が、Ｏリングと、樹脂胴体の面取りとの接触領域に位置されるか、または当該接触領域よりも外径側に位置されているから、樹脂胴体と、金属環との接合面を伝って泥水などが浸入しても、Ｏリングにより確実にせき止めることができる。
【００１２】
【本発明の実施の形態】
図１および図２に、本発明の実施形態１を示している。これらの図において左側は軸方向の車両インナー側、右側は軸方向の車両アウタ側を示す。
【００１３】
本実施形態の転がり軸受装置１００は、外輪１、ハブ軸２、内輪３、玉４，５、保持器６，７、シール８、ナット９、キャップ１０とを備える。
【００１４】
外輪１は、外輪部材として、その内周面に軸方向２列の軌道面１２，１３を有する。外輪１はまた、外周面に車体の懸架装置に対して当該外輪部材を取り付けるための取付フランジ１４を有する。
【００１５】
ハブ軸２と内輪３は、共に内輪部材として外輪１と同心に配置される。ハブ軸２は、内輪部材を構成する軸部材として、車両アウタ側の外周面に車輪等をボルトで取り付けるためのハブフランジ１５を有する。ハブ軸２はまた、軸方向中間の外周面に軸方向一方列の玉４用の軌道面１６を有する。ハブ軸２の車両インナ側の軸端にナット９が螺合される。
【００１６】
内輪３は、軸部材であるハブ軸２の外周面に固定される筒部材として、外周面に軸方向他方列の玉５用の軌道面１７を有する。内輪３は、ハブ軸２に取り付けられたナット９の締め付けによりハブ軸２の外周面に固定され、これによって、内輪３に予圧が付与されるようになっている。
【００１７】
玉４，５は、転動体として、外輪１の軌道面１２，１３と、ハブ軸２の軌道面１６および内輪３の軌道面１７との間で転動可能に複列に設けられており、一対の保持器６，７により保持されている。
【００１８】
シール８は、外輪１の車両アウタ側の端部と、ハブ軸２との間に介装されており、外部からの異物浸入を防止している。
【００１９】
キャップ１０は、外輪１の車両インナ側の端部に装着されて外輪１の車両インナ側開口を閉塞するものである。このキャップ１０は、樹脂材で有底円筒形状に形成されるものであり、円筒部１０ａの一端側に底壁１０ｂを一体に設けたものである。この円筒部１０ａの軸方向途中には、径方向外向きに突出するフランジ１０ｃが設けられている。
【００２０】
以上の構成の転がり軸受装置１００は、まず、ハブ軸２に対して、シール８、玉４および保持器６を仮組みした状態で外輪１が組み付けられる。次に、車両インナー側の内輪３と玉５と保持器７とからなる内輪組立体がハブ軸２に組み付けられた後、ハブ軸２の車両インナ側の軸端にナット９が螺合される。その後、キャップ１０が外輪１の車両インナ側の開口に取り付けられる。
【００２１】
本実施形態は、キャップ１０の取り付け構造を工夫している。
【００２２】
具体的に、まず、取付対象である外輪１の内周面の車両インナ側において、車両インナ側にかけて拡径する大径円周面１ａを形成し、この大径円周面１ａの入り隅（詳しくは、大径円周面１ａの基端側で外輪１の内周面との間に形成されている段部端面１ｃと、大径円周面１ａとの間の入り隅）には、溝部１ｂを周方向に連続形成する。一方、キャップ１０の円筒部１０ａの外周面の先端側角部には、この円筒部１０ａの先端へ向けて漸次縮径するテーパ状の面取り１０ｄを設ける。そして、外輪１の大径円周面１ａの入り隅にＯリング２０を配置し、このＯリング２０を、溝部１ｂとテーパ状面取り１０ｄとで圧縮している。
【００２３】
なお、溝部１ｂは、大径円周面１ａを研削加工する際に砥石が大径円周面１ａの入り隅と干渉することを防止する逃げ溝としても利用できる。
【００２４】
この実施形態では、外輪１の大径円周面１ａにキャップ１０の円筒部１０ａを所定の締め代を持って内嵌装着し、キャップ１０の円筒部１０ａのフランジ１０ｃを外輪１の車両インナ側開口の端部に当接させてキャップ１０を軸方向に位置決めしている。これにより、外輪１の溝部１ｂと、キャップ１０の円筒部１０ａの面取り１０ｄとでＯリング２０を所定量圧縮できるようにしている。
【００２５】
ただし、外輪１と、キャップ１０との嵌合締め代は、温度上昇時を基準に設定する。つまり、樹脂製のキャップ１０は、金属製の外輪１よりも線膨張係数が小さいため、温度上昇により外輪１の大径円周面１ａと、キャップ１０の円筒部１０ａとの嵌合部分に微小隙間が生じることのないよう、予め温度上昇した状態で締め代を設定するのが好ましい。
【００２６】
以上のように、外輪１の溝部１ｂと、キャップ１０の円筒部１０ａの面取り１０ｄとの対向隙間にＯリング２０を設置しており、このＯリング２０をこの対向隙間において所定量圧縮できるようにしているので、外輪１の大径円周面１ａと、キャップ１０の円筒部１０ａとの嵌合面を伝って泥水などが浸入することを防止できる。また、従来例のように、外輪１とキャップ１０との嵌合部分の軸方向途中にＯリング２０を設置するための溝を設ける必要がないため、外輪１およびキャップ１０の軸方向寸法を短縮化でき、転がり軸受装置１００の小型化が可能となる。
【００２７】
なお、本発明は、上記実施形態のみに限定されるものではなく、種々な応用や変形が考えられる。
【００２８】
（１）実施形態１に示すキャップ１０については、図３に示すように、フランジ１０ｃを設けないようにしてもよい。この場合、キャップ１０の円筒部１０ａの先端を、外輪１の大径円周面１ａの基端側段部端面１ｃに当接させることにより、キャップ１０を軸方向に位置決めすることができる。
【００２９】
（２）図４に実施形態２を示す。この実施形態２では、キャップ１０について、樹脂と金属の複合構造としている。
【００３０】
具体的に、キャップ１０は、樹脂胴体３０に金属環４０をインサートしたインサート成型品とされている。
【００３１】
樹脂胴体３０は、有底円筒形に形成されており、この樹脂胴体３０の円筒部３１の軸方向途中には、径方向外向きに突出するフランジ３３が設けられている。
【００３２】
金属環４０は、円筒部４１の一端側に径方向外向きに伸びるフランジ４２を一体に設けた形状となっている。この金属環４０の円筒部４１が、その外周面を露出させた状態で樹脂胴体３０の円筒部３１の外径側に埋め込まれており、また、金属環４０のフランジ４２が樹脂胴体３０のフランジ３３内に埋め込まれている。
【００３３】
なお、樹脂胴体３０の円筒部３１の外周面の先端側角部には、この円筒部３１の先端へ向けて漸次縮径するテーパ状の面取り３２が設けられており、金属環４０の円筒部４１の先端には、この円筒部４１の先端へ向けて漸次縮径するテーパ状の面取り４３が設けられている。そして、樹脂胴体３０の面取り３２と、金属環４０の面取り４３とは、面一とされている。
【００３４】
このような複合構造のキャップ１０の場合、樹脂胴体３０と、金属環４０との接合面を伝って泥水などが浸入するおそれがある。そこで、金属環４０の円筒部４１と、樹脂胴体３０の円筒部３１との接合面の端縁４４を、Ｏリング２０と、樹脂胴体３０の面取り３２との接触領域２１に位置させることにより、前記接合面の端縁４４を塞ぐようにしている。
【００３５】
以上の構成では、金属環４０の円筒部４１の外周面が、金属製の外輪１の大径円周面１ａと嵌合するようになるため、互いに金属同士の嵌合構造としているから、温度変化に関係なくキャップ１０の取り付け強度を向上することができる。しかも、金属環４０の円筒部４１と、樹脂胴体３０の円筒部３１との接合面の端縁４４がＯリング２０により塞がれているので、樹脂胴体３０と、金属環４０との接合面から泥水などが浸入することを防止できる。
【００３６】
なお、図５に示すように、金属環４０の円筒部４１と、樹脂胴体３０の円筒部３１との接合面の端縁４４を、Ｏリング２０と、樹脂胴体３０の面取り３２との接触領域２１よりも外径側に位置させてもよい。このようにすれば、樹脂胴体３０と、金属環４０との接合面を伝って泥水などが浸入しても、Ｏリング２０により確実にせき止めることができる。
【００３７】
（３）図６に実施形態３を示す。この実施形態３は、実施形態２のキャップ１０の先端部分を変更している。つまり、金属環４０の先端位置が、樹脂胴体３０の円筒部３１の先端位置から後退されて、樹脂胴体３０の円筒部３１の先端側角部には、この円筒部３１の先端へ向けて漸次縮径するテーパ状の面取り３２が設けられている。
【００３８】
この場合、樹脂胴体３０の円筒部３１と、金属環４０の円筒部４１との接合面の端縁４４が樹脂胴体３０の面取り３２から外れた領域に位置されることになって、Ｏリング２０と、樹脂胴体３０の面取り３２との接触領域２１よりも外径側に位置される。したがって、樹脂胴体３０と、金属環４０との接合面を伝って泥水などが浸入しても、Ｏリング２０によりせき止めることができる。
【００３９】
（４）図７に実施形態４を示す。この実施形態４は、実施形態２に示した金属環４０の円筒部４１の先端を後退させて、この円筒部４１の先端の面取り４３に樹脂胴体３０と一体の薄い樹脂膜３４を形成している。
【００４０】
この場合も、実施形態３と同様の作用、効果が得られる。
【００４１】
（５）図８および図９に実施形態５を示す。この実施形態５では、転がり軸受装置１００に回転検出装置５１を取り付けている。
【００４２】
この回転検出装置５１は、パルサリング５２と、磁気センサ５３とから構成される。パルサリング５２は内輪３に取り付けられ、磁気センサ５３はキャップ１０に取り付けられる。
【００４３】
つまり、パルサリング５２は、一方の内輪３の車両インナ側外周面に圧入して嵌着される上半分断面Ｌ字形の環状芯金５４と、この環状芯金５４の環状板部の車両インナ側端面に加硫接着などで固着された磁性体５５とから構成される。この磁性体５５は、磁性粉末を含有した合成ゴムあるいは合成樹脂からなり、Ｎ極とＳ極とが周方向に交互に同幅に着磁されている。
【００４４】
前記磁気センサ５３は、本体５６が軸方向に沿って車両インナ側からキャップ１０を挿通するように取り付けられ、この本体５６の車両アウタ側の端部に取り付けられてパルサリング５２の磁性体５５の車両インナ側の端面、すなわち被検出面に径方向で対向する検出素子５７を有している。
【００４５】
【発明の効果】
本発明の転がり軸受装置では、外輪部材と、キャップとの嵌合面を伝って泥水などが浸入することを防止できるようにしたうえで、外輪部材およびキャップの軸方向寸法を短縮化できるようにしている。そのため、本発明の転がり軸受装置では、密封性を確保しながら小型化が可能となる。
【図面の簡単な説明】
【図１】本発明の実施形態１に係る転がり軸受装置を示す縦断面図
【図２】図１の要部を示す断面図
【図３】実施形態１のキャップの変形例で、図２に対応する図
【図４】本発明の実施形態２に係る転がり軸受装置の要部を示す縦断面図
【図５】本発明の実施形態２に係る転がり軸受装置の要部を示す縦断面図
【図６】本発明の実施形態３に係る転がり軸受装置の要部を示す縦断面図
【図７】本発明の実施形態４に係る転がり軸受装置を示す縦断面図
【図８】本発明の実施形態５に係る転がり軸受装置を示す縦断面図
【図９】図８の要部を示す断面図
【符号の説明】
１ 外輪
１ａ 大径円筒面
１ｂ 溝部
１０ キャップ
１０ａ 円筒部
１０ｄ 面取り
２０ Ｏリング[0001]
[Industrial application field]
The present invention relates to a rolling bearing device.
[0002]
[Prior art]
As a rolling bearing device, for example, there is one that rotatably supports wheels on the body of an automobile. Examples of this type of rolling bearing device include those shown in Utility Model Registration No. 257426 (referred to as Conventional Example 1) and Japanese Patent Laid-Open No. 9-133129 (referred to as Conventional Example 2).
[0003]
In Conventional Example 1, a cap that conceals the inner diameter portion is attached to the vehicle inner side opening of the outer ring to prevent intrusion of muddy water, washing water, and the like from the opening. The cap is made of metal and is fitted on the inner side of the inner peripheral surface of the outer ring made of metal.
[0004]
In this case, the metal outer ring and the metal cap are tight-fitted, but still muddy water, washing water, etc. are likely to enter through the fitting surface between the outer ring and the cap. Therefore, in Conventional Example 1, an O-ring is interposed midway in the axial direction on the fitting surface between the outer ring and the cap. The O-ring is housed in a groove provided on the inner peripheral surface of the outer ring.
[0005]
In Conventional Example 2, as in Conventional Example 1, a cap is attached to the vehicle inner side opening of the outer ring, but this cap is made of resin that is easy to manufacture and inexpensive, and the inner peripheral surface of the metal outer ring. Is fitted on the inner side of the vehicle.
[0006]
In this case, since the linear expansion coefficient of the metal outer ring and the resin cap is different, when the outer ring expands due to a temperature change, the expansion amount of the cap cannot follow the expansion amount. The margin of interference tends to decrease. Therefore, muddy water, washing water and the like easily enter through the fitting surface between the outer ring and the cap. Therefore, in Conventional Example 2, an O-ring is interposed midway in the axial direction on the fitting surface between the outer ring and the cap. The O-ring is accommodated in a groove provided on the outer peripheral surface of the cap.
[0007]
[Problems to be solved by the invention]
In both of the conventional examples 1 and 2, it is necessary to secure an installation space for the O-ring in the axial direction of the fitting region between the outer ring and the cap, which necessitates an increase in the size of the entire rolling bearing device.
[0008]
[Means for Solving the Problems]
A rolling bearing device according to the present invention includes a metal outer ring member, an inner ring member disposed concentrically with the outer ring member, a plurality of rolling elements provided in an annular space between the two members, and an inner circumference of the outer ring member. A resin cap that is attached to one end of the surface and closes one end of the outer ring member, and one end side of the inner peripheral surface of the outer ring member is an enlarged large-diameter circumferential surface. A large-diameter circumferential surface at a corner between the stepped end surface and the large-diameter circumferential surface formed perpendicular to the axial direction between the inner circumferential surface of the outer ring member and the large-diameter circumferential surface. inner and groove respectively extends in the radial and axial direction with respect to the stepped end face is provided at the tip of the cap, in a state with a predetermined interference to the large diameter circumferential surface of the outer ring member A cylindrical part to be fitted and installed is provided, and gradually shrinks toward the tip at the corner on the tip side of the outer peripheral surface of this cylindrical part. Tapered chamfering is provided to the be disposed an O-ring in the groove, the O-ring, the being compressed between said tapered chamfer and groove.
[0009]
In this case, an O-ring is installed in the facing gap between the groove portion of the outer ring member and the chamfer of the cylindrical portion of the cap, and the O-ring can be compressed by a predetermined amount in the facing gap. It is possible to prevent muddy water or the like from entering through the fitting surface between the radial circumferential surface and the cylindrical portion of the cap. Moreover, since it is not necessary to provide a groove for installing an O-ring in the middle of the fitting portion between the outer ring member and the cap as in the conventional example, the axial dimension of the outer ring member and the cap can be shortened. It is possible to reduce the size of the rolling bearing device.
[0010]
Further, the rolling bearing device of the present invention includes a metal outer ring member, an inner ring member disposed concentrically with the outer ring member, a plurality of rolling elements provided in an annular space of the both members, and the outer ring member. A cap mounted on one end side of the inner peripheral surface and closing one end side of the outer ring member, and one end side of the inner peripheral surface of the outer ring member is an enlarged large-diameter circumferential surface, A large-diameter circumferential surface at a corner between the stepped end surface and the large-diameter circumferential surface formed perpendicular to the axial direction between the inner circumferential surface of the outer ring member and the large-diameter circumferential surface, Grooves that extend in the radial direction and the axial direction are provided with respect to the stepped end surface, respectively , and the cap has an outer periphery on the outer diameter side of the cylindrical body of the resin barrel and the cylindrical portion of the resin barrel. It has a composite structure with a metal ring embedded with the surface exposed, and this cap tree Tapered chamfer gradually reduced in diameter toward the distal end side corner part of the outer peripheral surface of the trunk of the cylindrical portion to the tip is provided, the metal ring in the cap, to the large diameter circumferential surface of the outer ring member are fitted and mounted in a state with a predetermined interference, have O-ring is disposed in the groove, the O-ring, which is compressed between said tapered chamfer and the groove, and wherein the metal The edge of the joint surface between the ring and the cylindrical portion of the resin body is located in the contact region between the O-ring and the tapered chamfer, or is located on the outer diameter side of the contact region.
[0011]
In this case, since the metal ring of the cap is fitted to the large-diameter circumferential surface of the metal outer ring member, a fitting structure between the metals is obtained, so that the mounting strength of the cap is improved regardless of temperature changes. be able to. In addition, the edge of the joint surface between the metal ring and the cylindrical portion of the resin body is located in a contact area between the O-ring and the chamfer of the resin body, or is located on the outer diameter side of the contact area. Therefore, even if muddy water or the like enters through the joint surface between the resin body and the metal ring, it can be reliably dammed by the O-ring.
[0012]
[Embodiments of the Invention]
1 and 2 show Embodiment 1 of the present invention. In these drawings, the left side shows the vehicle inner side in the axial direction, and the right side shows the vehicle outer side in the axial direction.
[0013]
A rolling bearing device 100 according to this embodiment includes an outer ring 1, a hub shaft 2, an inner ring 3, balls 4 and 5, cages 6 and 7, a seal 8, a nut 9, and a cap 10.
[0014]
The outer ring 1 has two rows of raceway surfaces 12 and 13 on its inner peripheral surface as outer ring members. The outer ring 1 also has an attachment flange 14 for attaching the outer ring member to the suspension device of the vehicle body on the outer peripheral surface.
[0015]
The hub shaft 2 and the inner ring 3 are both disposed concentrically with the outer ring 1 as inner ring members. The hub shaft 2 has a hub flange 15 for attaching a wheel or the like to the outer peripheral surface of the vehicle outer side with a bolt as a shaft member constituting an inner ring member. The hub shaft 2 also has a raceway surface 16 for the balls 4 in one axial row on the outer peripheral surface in the middle in the axial direction. A nut 9 is screwed to a shaft end of the hub shaft 2 on the vehicle inner side.
[0016]
The inner ring 3 has a raceway surface 17 for the balls 5 in the other axial row on the outer peripheral surface as a cylindrical member fixed to the outer peripheral surface of the hub shaft 2 that is a shaft member. The inner ring 3 is fixed to the outer peripheral surface of the hub shaft 2 by tightening a nut 9 attached to the hub shaft 2, whereby preload is applied to the inner ring 3.
[0017]
The balls 4 and 5 are provided as rolling elements in a double row so as to be able to roll between the raceway surfaces 12 and 13 of the outer ring 1 and the raceway surface 16 of the hub axle 2 and the raceway surface 17 of the inner ring 3. It is held by a pair of cages 6 and 7.
[0018]
The seal 8 is interposed between the end portion of the outer ring 1 on the vehicle outer side and the hub shaft 2 to prevent foreign matter from entering from the outside.
[0019]
The cap 10 is attached to an end portion of the outer ring 1 on the vehicle inner side, and closes the vehicle inner side opening of the outer ring 1. The cap 10 is made of a resin material and has a bottomed cylindrical shape, and a bottom wall 10b is integrally provided on one end side of the cylindrical portion 10a. A flange 10c projecting radially outward is provided in the middle of the cylindrical portion 10a in the axial direction.
[0020]
In the rolling bearing device 100 having the above configuration, first, the outer ring 1 is assembled to the hub shaft 2 in a state where the seal 8, the balls 4 and the cage 6 are temporarily assembled. Next, after the inner ring assembly comprising the inner ring 3 on the vehicle inner side, the balls 5 and the cage 7 is assembled to the hub shaft 2, the nut 9 is screwed onto the shaft end of the hub shaft 2 on the vehicle inner side. . Thereafter, the cap 10 is attached to the opening on the vehicle inner side of the outer ring 1.
[0021]
In the present embodiment, the attachment structure of the cap 10 is devised.
[0022]
Specifically, first, on the vehicle inner side of the inner peripheral surface of the outer ring 1 to be attached, a large-diameter circumferential surface 1a that expands toward the vehicle inner side is formed, and a corner of the large-diameter circumferential surface 1a ( Specifically, the stepped end surface 1c formed between the base end side of the large-diameter circumferential surface 1a and the inner peripheral surface of the outer ring 1 and the corner between the large-diameter circumferential surface 1a) The groove portion 1b is continuously formed in the circumferential direction. On the other hand, a tapered chamfer 10d that gradually decreases in diameter toward the tip of the cylindrical portion 10a is provided at the tip side corner of the outer peripheral surface of the cylindrical portion 10a of the cap 10. And the O-ring 20 is arrange | positioned in the corner of the large-diameter circumferential surface 1a of the outer ring 1, and this O-ring 20 is compressed by the groove portion 1b and the tapered chamfer 10d.
[0023]
The groove portion 1b can also be used as a relief groove that prevents the grindstone from interfering with the corners of the large-diameter circumferential surface 1a when grinding the large-diameter circumferential surface 1a.
[0024]
In this embodiment, the cylindrical portion 10a of the cap 10 is fitted on the large-diameter circumferential surface 1a of the outer ring 1 with a predetermined allowance, and the flange 10c of the cylindrical portion 10a of the cap 10 is connected to the vehicle inner side of the outer ring 1. The cap 10 is positioned in the axial direction in contact with the end of the opening. Thus, the O-ring 20 can be compressed by a predetermined amount by the groove 1b of the outer ring 1 and the chamfering 10d of the cylindrical portion 10a of the cap 10.
[0025]
However, the fitting tightening allowance between the outer ring 1 and the cap 10 is set based on the temperature rise. That is, since the resin cap 10 has a smaller linear expansion coefficient than that of the metal outer ring 1, the resin cap 10 has a minute amount at the fitting portion between the large-diameter circumferential surface 1 a of the outer ring 1 and the cylindrical portion 10 a of the cap 10 due to temperature rise. It is preferable to set the tightening allowance in a state where the temperature has risen in advance so that no gap is generated.
[0026]
As described above, the O-ring 20 is installed in the facing gap between the groove 1b of the outer ring 1 and the chamfering 10d of the cylindrical portion 10a of the cap 10, and the O-ring 20 can be compressed by a predetermined amount in the facing gap. Therefore, muddy water or the like can be prevented from entering along the fitting surface between the large-diameter circumferential surface 1a of the outer ring 1 and the cylindrical portion 10a of the cap 10. Further, unlike the conventional example, it is not necessary to provide a groove for installing the O-ring 20 in the axial direction of the fitting portion between the outer ring 1 and the cap 10, so the axial dimensions of the outer ring 1 and the cap 10 are shortened. Thus, the rolling bearing device 100 can be downsized.
[0027]
In addition, this invention is not limited only to the said embodiment, Various application and deformation | transformation can be considered.
[0028]
(1) About the cap 10 shown in Embodiment 1, as shown in FIG. 3, you may make it not provide the flange 10c. In this case, the cap 10 can be positioned in the axial direction by bringing the tip of the cylindrical portion 10 a of the cap 10 into contact with the proximal-end stepped end surface 1 c of the large-diameter circumferential surface 1 a of the outer ring 1.
[0029]
(2) Embodiment 2 is shown in FIG. In the second embodiment, the cap 10 has a composite structure of resin and metal.
[0030]
Specifically, the cap 10 is an insert molded product in which a metal ring 40 is inserted into the resin body 30.
[0031]
The resin body 30 is formed in a bottomed cylindrical shape, and a flange 33 projecting radially outward is provided in the middle of the cylindrical portion 31 of the resin body 30 in the axial direction.
[0032]
The metal ring 40 has a shape in which a flange 42 extending radially outward is integrally provided on one end side of the cylindrical portion 41. The cylindrical portion 41 of the metal ring 40 is embedded on the outer diameter side of the cylindrical portion 31 of the resin body 30 with its outer peripheral surface exposed, and the flange 42 of the metal ring 40 is the flange of the resin body 30. 33 is embedded.
[0033]
A tapered chamfer 32 that gradually decreases in diameter toward the tip of the cylindrical portion 31 is provided at the corner on the tip end of the outer peripheral surface of the cylindrical portion 31 of the resin body 30, and the cylindrical portion of the metal ring 40. The tip of 41 is provided with a tapered chamfer 43 that gradually decreases in diameter toward the tip of the cylindrical portion 41. The chamfer 32 of the resin body 30 and the chamfer 43 of the metal ring 40 are flush with each other.
[0034]
In the case of the cap 10 having such a composite structure, there is a risk that muddy water or the like may enter through the joint surface between the resin body 30 and the metal ring 40. Therefore, by positioning the edge 44 of the joint surface between the cylindrical portion 41 of the metal ring 40 and the cylindrical portion 31 of the resin body 30 in the contact region 21 between the O-ring 20 and the chamfer 32 of the resin body 30, The end edge 44 of the joint surface is closed.
[0035]
In the above configuration, since the outer peripheral surface of the cylindrical portion 41 of the metal ring 40 is fitted to the large-diameter circumferential surface 1a of the metal outer ring 1, the metal-to-metal fitting structure is employed. The attachment strength of the cap 10 can be improved regardless of the change. In addition, since the edge 44 of the joint surface between the cylindrical portion 41 of the metal ring 40 and the cylindrical portion 31 of the resin body 30 is closed by the O-ring 20, the joint surface between the resin body 30 and the metal ring 40. Can prevent muddy water from entering.
[0036]
As shown in FIG. 5, the edge 44 of the joint surface between the cylindrical portion 41 of the metal ring 40 and the cylindrical portion 31 of the resin body 30 is a contact region between the O-ring 20 and the chamfer 32 of the resin body 30. It may be positioned on the outer diameter side than 21. In this way, even if muddy water or the like enters through the joint surface between the resin body 30 and the metal ring 40, the O-ring 20 can surely prevent the mud.
[0037]
(3) Embodiment 3 is shown in FIG. In the third embodiment, the tip portion of the cap 10 of the second embodiment is changed. That is, the tip position of the metal ring 40 is retracted from the tip position of the cylindrical portion 31 of the resin body 30, and gradually toward the tip of the cylindrical portion 31 at the corner on the tip side of the cylindrical portion 31 of the resin body 30. A tapered chamfer 32 having a reduced diameter is provided.
[0038]
In this case, the edge 44 of the joint surface between the cylindrical portion 31 of the resin body 30 and the cylindrical portion 41 of the metal ring 40 is positioned in a region that is out of the chamfer 32 of the resin body 30, and the O-ring 20. And it is located in the outer diameter side rather than the contact area | region 21 with the chamfer 32 of the resin trunk | drum 30. FIG. Therefore, even if muddy water or the like enters through the joint surface between the resin body 30 and the metal ring 40, it can be dammed by the O-ring 20.
[0039]
(4) Embodiment 4 is shown in FIG. In the fourth embodiment, the tip of the cylindrical portion 41 of the metal ring 40 shown in the second embodiment is retracted, and a thin resin film 34 integrated with the resin body 30 is formed on the chamfer 43 at the tip of the cylindrical portion 41. Yes.
[0040]
In this case, the same operation and effect as in the third embodiment can be obtained.
[0041]
(5) A fifth embodiment is shown in FIGS. In the fifth embodiment, the rotation detection device 51 is attached to the rolling bearing device 100.
[0042]
The rotation detection device 51 includes a pulsar ring 52 and a magnetic sensor 53. The pulsar ring 52 is attached to the inner ring 3, and the magnetic sensor 53 is attached to the cap 10.
[0043]
That is, the pulsar ring 52 has an upper half-section L-shaped annular cored bar that is press-fitted into and fitted to the inner side outer peripheral surface of one inner ring 3, and a vehicle inner side end surface of the annular plate portion of the annular cored bar 54. And a magnetic body 55 fixed to the substrate by vulcanization adhesion or the like. The magnetic body 55 is made of synthetic rubber or synthetic resin containing magnetic powder, and N poles and S poles are alternately magnetized with the same width in the circumferential direction.
[0044]
The magnetic sensor 53 is attached so that the main body 56 is inserted through the cap 10 from the vehicle inner side along the axial direction, and is attached to the end portion of the main body 56 on the vehicle outer side so that the magnetic body 55 of the pulsar ring 52 is mounted on the vehicle. It has a detection element 57 that faces the inner end face, that is, the surface to be detected, in the radial direction.
[0045]
【The invention's effect】
In the rolling bearing device of the present invention, it is possible to prevent muddy water and the like from entering through the fitting surface between the outer ring member and the cap, and to reduce the axial dimension of the outer ring member and the cap. ing. Therefore, the rolling bearing device of the present invention can be downsized while ensuring the sealing performance.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a rolling bearing device according to a first embodiment of the present invention. FIG. 2 is a sectional view showing a main part of FIG. 1. FIG. FIG. 4 is a longitudinal sectional view showing the main part of the rolling bearing device according to the second embodiment of the present invention. FIG. 5 is a longitudinal sectional view showing the main part of the rolling bearing device according to the second embodiment of the present invention. FIG. 6 is a longitudinal sectional view showing a main part of a rolling bearing device according to Embodiment 3 of the present invention. FIG. 7 is a longitudinal sectional view showing a rolling bearing device according to Embodiment 4 of the present invention. FIG. 9 is a longitudinal sectional view showing a rolling bearing device according to a fifth embodiment. FIG. 9 is a sectional view showing the main part of FIG.
DESCRIPTION OF SYMBOLS 1 Outer ring 1a Large diameter cylindrical surface 1b Groove part 10 Cap 10a Cylindrical part 10d Chamfering 20 O-ring

Claims (2)

金属製の外輪部材と、
前記外輪部材と同心に配置された内輪部材と、
前記両部材の環状空間に設けられた複数の転動体と、
前記外輪部材の内周面の一端側に装着されて前記外輪部材の一端側を閉塞する樹脂製のキャップとを備え、
前記外輪部材の内周面の一端側が、拡径された大径円周面とされているとともに、前記外輪部材の内周面と大径円周面との間に軸方向に対して垂直に形成された段部端面と大径円周面との間の入り隅に、大径円周面と段部端面とに対してそれぞれ径方向および軸方向に拡がる溝部が設けられており、
前記キャップの先端に、前記外輪部材の大径円周面に対して所定の締め代を持つ状態で内嵌装着される円筒部が設けられており、この円筒部の外周面の先端側角部に先端へ向けて漸次縮径するテーパ状面取りが設けられており、
前記溝部内にＯリングが配置されていて、このＯリングが、前記溝部と前記テーパ状面取りとで圧縮されている、転がり軸受装置。A metal outer ring member;
An inner ring member disposed concentrically with the outer ring member;
A plurality of rolling elements provided in the annular space of the two members;
A resin cap attached to one end side of the inner peripheral surface of the outer ring member and closing one end side of the outer ring member;
One end side of the inner peripheral surface of the outer ring member is an enlarged large-diameter circumferential surface, and is perpendicular to the axial direction between the inner peripheral surface and the large-diameter circumferential surface of the outer ring member. In the corner between the formed step end surface and the large diameter circumferential surface, a groove portion is provided that extends in the radial direction and the axial direction with respect to the large diameter circumferential surface and the step end surface, respectively .
The tip of the cap, the cylindrical portion being internally fitted attached in a state with a predetermined interference to the large diameter circumferential surface of the outer ring member is provided, the distal end side corner part of the outer peripheral surface of the cylindrical portion Is provided with a tapered chamfer that gradually decreases in diameter toward the tip,
A rolling bearing device in which an O-ring is disposed in the groove, and the O-ring is compressed by the groove and the tapered chamfer. 金属製の外輪部材と、
前記外輪部材と同心に配置された内輪部材と、
前記両部材の環状空間に設けられた複数の転動体と、
前記外輪部材の内周面の一端側に装着されて前記外輪部材の一端側を閉塞するキャップとを備え、
前記外輪部材の内周面の一端側が、拡径された大径円周面とされているとともに、前記外輪部材の内周面と大径円周面との間に軸方向に対して垂直に形成された段部端面と大径円周面との間の入り隅に、大径円周面と段部端面とに対してそれぞれ径方向および軸方向に拡がる溝部が設けられており、
前記キャップが、有底円筒形に形成された樹脂胴体と、この樹脂胴体の円筒部の外径側に外周面が露出した状態で埋め込まれる金属環とを有する複合構成になっており、
このキャップの樹脂胴体の円筒部の外周面の先端側角部に先端へ向けて漸次縮径するテーパ状面取りが設けられており、
このキャップの前記金属環が、前記外輪部材の大径円周面に対して所定の締め代を持つ状態で内嵌装着されており、
前記溝部内にＯリングが配置されていて、このＯリングが、前記溝部と前記テーパ状面取りとで圧縮されており、かつ、前記金属環と前記樹脂胴体の前記円筒部との接合面の端縁が前記Ｏリングと前記テーパ状面取りとの接触領域に位置されているか、または前記接触領域よりも外径側に位置されている、転がり軸受装置。A metal outer ring member;
An inner ring member disposed concentrically with the outer ring member;
A plurality of rolling elements provided in the annular space of the two members;
A cap mounted on one end side of the inner peripheral surface of the outer ring member and closing one end side of the outer ring member;
One end side of the inner peripheral surface of the outer ring member is an enlarged large-diameter circumferential surface, and is perpendicular to the axial direction between the inner peripheral surface and the large-diameter circumferential surface of the outer ring member. In the corner between the formed step end surface and the large diameter circumferential surface, a groove portion is provided that extends in the radial direction and the axial direction with respect to the large diameter circumferential surface and the step end surface, respectively .
The cap has a composite structure having a resin body formed in a bottomed cylindrical shape and a metal ring embedded with an outer peripheral surface exposed on the outer diameter side of the cylindrical portion of the resin body,
A taper-shaped chamfer that gradually decreases in diameter toward the tip is provided at the tip side corner of the outer peripheral surface of the cylindrical portion of the resin body of the cap,
Said metal ring in the cap are internally fitted attached in a state with a predetermined interference to the large diameter circumferential surface of the outer ring member,
An O-ring is disposed in the groove, the O-ring is compressed by the groove and the tapered chamfer, and the end of the joint surface between the metal ring and the cylindrical portion of the resin body A rolling bearing device in which an edge is positioned in a contact region between the O-ring and the tapered chamfer or is positioned on an outer diameter side of the contact region.
JP2002208149A 2002-07-17 2002-07-17 Rolling bearing device Expired - Fee Related JP3988557B2 (en)

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WO2015023493A1 (en) * 2013-08-16 2015-02-19 Applied Materials, Inc. Sealing groove methods for semiconductor equipment
JP2016534299A (en) * 2013-08-16 2016-11-04 アプライド マテリアルズ インコーポレイテッドＡｐｐｌｉｅｄ Ｍａｔｅｒｉａｌｓ，Ｉｎｃｏｒｐｏｒａｔｅｄ Sealing groove method for semiconductor devices
US9646807B2 (en) 2013-08-16 2017-05-09 Applied Materials, Inc. Sealing groove methods for semiconductor equipment

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