JP3822041B2 - Vehicle bearing device - Google Patents

Vehicle bearing device Download PDF

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Publication number
JP3822041B2
JP3822041B2 JP2000262547A JP2000262547A JP3822041B2 JP 3822041 B2 JP3822041 B2 JP 3822041B2 JP 2000262547 A JP2000262547 A JP 2000262547A JP 2000262547 A JP2000262547 A JP 2000262547A JP 3822041 B2 JP3822041 B2 JP 3822041B2
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Japan
Prior art keywords
shaft portion
vehicle
hub wheel
constant velocity
velocity joint
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Expired - Fee Related
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JP2000262547A
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Japanese (ja)
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JP2002070881A (en
Inventor
啓介 野村
昌弘 井上
孝爾 嶋
義文 重
節二 鈴木
誠 岡田
成司 放生
恒一 相田
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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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/063—Fixing them on the shaft
    • F16C35/0635—Fixing them on the shaft the bore of the inner ring being of special non-cylindrical shape which co-operates with a complementary shape on the shaft, e.g. teeth, polygonal sections
    • 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
    • F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
    • F16C2226/50—Positive connections
    • F16C2226/60—Positive connections with threaded parts, e.g. bolt and nut connections
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
    • F16D3/22—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts
    • F16D3/223—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
    • F16D2003/22326—Attachments to the outer joint member, i.e. attachments to the exterior of the outer joint member or to the shaft of the outer joint member

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Support Of The Bearing (AREA)
  • Mounting Of Bearings Or Others (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、ディスクブレーキ装置のディスクロータおよび車輪が取り付けられる車両用ハブユニット等の車両用軸受装置に関する。
【０００２】
【従来の技術】
図１１で示される従来の駆動輪用ハブユニットにおいては、車輪が取り付けられるハブホイール１の中空軸部１２の外周に複列転がり軸受２が外嵌装着されている。このハブホイール１は、等速ジョイント３により、シャフト７に対して傾動可能に連結される。ハブホイール１の中空軸部１２における車両インナ側軸端は、径方向外向きに屈曲変形されてかしめ部１２ａとされ複列転がり軸受２における内輪２５の外端面にかしめつけられることで、その内輪２５に対して予圧と抜け止めとが行われる。
【０００３】
等速ジョイント３の外輪３１は、傾動案内用のボール群の軌道となる椀型の筒部３５と、これの小径部分にハブホイール１の中空軸部１２に挿入されて該中空軸部１２とスプライン嵌合する軸部３６とで構成される。
【０００４】
等速ジョイント３は、その椀型筒部３５がハブホイール１の中空軸部１２における車両インナ側軸端を径方向外向きに屈曲変形してなるかしめ部１２ａに当接されている一方、その外輪軸部３６の車両アウタ側の小径ねじ軸部３６ｈに螺合されたナット３６ｉの端面がハブホイール１の中空軸部１２の車両アウタ側開口１２ｃの端面１２ｈに宛てがわれた状態で、ナット３６ｉの締結によりハブホイール１に連結されている。
【０００５】
【発明が解決しようとする課題】
上記のようなハブユニットの場合、一般に、複列転がり軸受２の内輪２５の外端面にハブホイール１の車両インナ側端部をかしめつけることにより、複列転がり軸受２に予圧を付与している。
【０００６】
通常、ハブホイール１に等速ジョイント３の外輪３１を結合するために、ナット３６ｉは緩みのないよう所要のトルクで締め付けられる。
【０００７】
ところで、図１１のように、かしめ部１２ａと、等速ジョイント３の外輪軸部３６とを接触させて、椀型筒部３６とナット３６ｉとで軸方向から挟む形態とすることにより、ハブホイール１と等速ジョイント３とを結合する構造の場合、締め付けトルクが、複列転がり軸受２に対して余分な負荷としてかかり、前記予圧に影響を及ぼすおそれがある。
【０００８】
そこで、本願出願人は、鋭意研究の結果、前記予圧に対してナット３６ｉの締め付けトルクの影響を低減できる構造を考え付き本発明を完成できるに至った。
【０００９】
したがって、本発明は、車両用ハブユニット等の軸受装置において、ナットを緩まないよう締め付けても、その締め付けが複列転がり軸受に対する予圧に影響しないようにすることを課題としている。
【００１０】
【課題を解決するための手段】
本発明の車両用軸受装置は、車輪が取り付けられるハブホイールの中空軸部の外周に複列転がり軸受が外嵌装着され、また、このハブホイールを駆動軸に対して傾動可能に連結する等速ジョイントを備えた車両用軸受装置であって、ハブホイールの中空軸部における車両インナ側軸端が複列転がり軸受の車両インナ側内輪の外端面にかしめつけられており、等速ジョイントの外輪が、傾動案内用のボール群の軌道となる椀型の筒部とこれの小径部分にハブホイールの中空軸部に挿入されてスプライン嵌合する外輪軸部とを有する構成とされており、前記等速ジョイントの外輪軸部の車両アウタ側軸端にねじ軸部が設けられ、このねじ軸部に対してナットが螺合され、このナットがハブホイールの中空軸部の車両アウタ側端面に当てられることでハブホイールに等速ジョイントの外輪が結合されており、中空軸部の内周面の車両アウタ側端面から軸方向車両インナ側に離れた位置に径方向外方へ拡径された周溝状切欠きを設けて構成されている。
【００２０】
【発明の実施の形態】
以下、本発明の詳細を図面に示す実施形態に基づいて説明する。
【００２１】
本実施形態は、車両用ハブユニットについて説明するが、本発明はこれに限定されず、車両用の軸受装置に適用することができる。
【００２２】
図１ないし図４は、本発明の実施形態に係る車両用ハブユニットを示し、図１は、車両用ハブユニットの縦断側面図、図２は、図１の要部の拡大図、図３は、図２に示されるハブホイールの中空軸部の拡大図、図４は、図２に示される等速ジョイントの外輪軸部の拡大図である。
【００２３】
図例の車両用ハブユニットは、自動車の駆動輪側に使用されるタイプであって、ハブホイール１と、複列転がり軸受２と、等速ジョイント３とを備える。
【００２４】
ハブホイール１は、不図示の車輪が取り付けられる径方向外向きのフランジ１１と、複列転がり軸受２がその外周の軸受嵌合領域に固定される中空軸部１２とを有する。ハブホイール１の中空軸部１２の外周面の車両アウタ側寄りに複列転がり軸受２における片方列のボール２２群の軌道面２２ａが形成されている。
【００２５】
ハブホイール１の中空軸部１２の車両インナ側軸端は、径方向外向きに屈曲されて複列転がり軸受２の車両インナ側内輪２５の外端面にかしめつけられたかしめ部１２ａとなっている。
【００２６】
複列転がり軸受２は、二列の軌道溝を有する単一の外輪２１と、二列で配設される転動体としての複数のボール２２と、二つの冠形保持器２３とから構成されており、本来必要な２つの内輪については、一方は上述したようにハブホイール１の車両アウタ側の軌道面２２ａを利用し、車両インナ側の内輪２５のみを備えた構成となっている。なお、上記外輪２１には、車体６などにボルト止めされる径方向外向きのフランジ２４が形成されている。
【００２７】
等速ジョイント３は、例えば、周知のツェッパタイプ（バーフィールド型）と呼ばれるものとされ、外輪３１、内輪３２、ボール３３および保持器３４などから構成されている。
【００２８】
外輪３１は、内輪３２、ボール３３および保持器３４などが収納配設される椀形筒部３５と、この椀形筒部３５の小径側に一体に連接される軸部３６とから構成されている。
【００２９】
内輪３２には、シャフト（駆動軸）７の一端側がスプライン嵌合されるとともに止め輪（符号省略）などで抜け止め固定され、このシャフト７の他端側が、図示しない別の等速ジョイントを介して車両のデファレンシャル装置に取り付けられる。
【００３０】
そして、上記ハブホイール１の外周面に複列転がり軸受２を取り付けると共にハブホイール１に対して複列転がり軸受２と近接した状態で等速ジョイント３を取り付ける。
【００３１】
また、上記フランジ１１の円周数箇所には、ディスクブレーキ装置のディスクロータ４および車輪（図示省略）を固定するためのボルト１３が貫通状態で装着されている。
【００３２】
このような車両用ハブユニットでは、シャフト７の回転動力が、等速ジョイント３を介してハブホイール１に取り付けられてある車輪（図示省略）に対して伝達される。
【００３３】
次に、等速ジョイントの３の外輪３１は、かしめ部１２ａに対して等速ジョイント３の外輪３１における椀型筒部３５が隙間Ｇにより非接触となる状態でハブホイール１に結合されている。
【００３４】
この結合のため、ハブホイール１の中空軸部１２における軸方向途中位置１２ｂと車両アウタ側軸端１２ｃとが等速ジョイント３の外輪軸部３６における軸方向途中位置３６ｂと車両アウタ側軸端３６ｃ側とで軸方向から挟みつける形態とされている。
【００３５】
具体的には、ハブホイール１の中空軸部１２の内周において、その車両インナ側軸端であるかしめ部１２ａから軸方向途中位置１２ｂまでが大径とされ、その途中位置１２ｂから車両アウタ側軸端１２ｃまでが小径とされ、その小径側に溝底１２ｄが大径部１２ｅより内径側に位置する雌スプライン１２ｆが設けられている。
【００３６】
一方、等速ジョイント３の外輪３１の軸部３６の外周において、その車両インナ側軸端３６ａから途中位置３６ｂまでが大径とされ、その途中位置３６ｂから車両アウタ側軸端３６ｃまでが小径とされ、この小径部に歯先３６ｄが大径部３６ｅより内径側に位置する雄スプライン３６ｆが設けられている。
【００３７】
そして、車両インナ側からハブホイール１の中空軸部１２に、等速ジョイント３の外輪軸部３６が挿入されてハブホイール１の中空軸部１２における前記大径部と小径部との段壁面１２ｇ（軸方向途中位置）に、等速ジョイント３の外輪軸部３６における大径部と小径部との段壁３６ｇ（軸方向途中位置）が宛てがわれた状態で外輪軸部３６の車両アウタ側軸端３６ｃ側が中空軸部１２の車両アウタ側軸端１２ｃに対して位置決めされるようになっている。
【００３８】
この位置決めは、等速ジョイント３の外輪軸部３６における車両アウタ側軸端３６ｃに小径ねじ軸部３６ｈが設けられている。
【００３９】
ナット３６ｉは、小径ねじ軸部３６ｈに螺合されるとともに、その端面３６ｊがハブホイール１の中空軸部１２の車両アウタ側軸端１２ｃの端面１２ｈに対して当てられた状態で、締め付けられている。
【００４０】
以上の実施形態の場合、複列転がり軸受２の車両アウタ側内輪２５の外端面２５ａにかしめつけられているかしめ部１２ａに対して等速ジョイント３の外輪３１における椀型筒部３５が軸方向隙間Ｇを隔てて非接触となる状態でハブホイール１に対して等速ジョイント３の外輪３１が結合されている。
【００４１】
したがって、等速ジョイント３の外輪軸部３６からかしめ部１２ａを通じて、内輪２５に余分な負荷がかからずに済み、その予圧が適正に保たれる。
【００４２】
この場合、ナット３６ｉの緩みを防止するためにその締め付けトルクが強くなると、ハブホイール１の中空軸部１２において段壁面１２ｇと車両アウタ側軸端１２ｃの端面１２ｈとの間の軸方向部分に対しての軸方向圧縮力が、かしめ部１２ａを通じて、内輪２５に余分な負荷がかかり得るから、実施形態では次に述べる構成を備える。
【００４３】
すなわち、この実施形態においては、中空軸部１２の車両アウタ側軸端部１２ｃ寄りに、ナット３６ｉの螺合に伴い軸方向の弾性圧縮を許容する低剛性部として、中空軸部１２の内周面において車両アウタ側の所要領域に周溝状切り欠き１２ｋが設けられている。
【００４４】
この切り欠き１２ｋにより、車両アウタ側軸端部１２ｃは、ナット３６ｉの締め付けトルクの大きさに応じて弾性圧縮可能とされている。
【００４５】
ナット３６ｉの締め付けトルクは、車両アウタ側軸端部１２ｃの車両インナ側方向への弾性圧縮により吸収されるから、ハブホイール１の中空軸部１２において段壁面１２ｇと車両アウタ側軸端の端面１２ｈとの間の軸方向部分に対して過剰な軸方向圧縮力がかからず、したがって、内輪２５に対して適正な予圧を付与した状態を保持することができる。
【００４６】
図５ないし図８を参照して本発明の参考形態に係る車両用ハブユニットについて説明する。ここで、図５は、車両用ハブユニットの縦断側面図、図６は、図５の要部の拡大図、図７は、図６に示されるハブホイールの中空軸部の拡大図、図８は、図６に示される等速ジョイントの外輪軸部の拡大図であり、図１ないし図４と対応する部分には同一の符号が付されている。
【００４７】
本参考形態では、図５ないし図８で示すように、外輪軸部３６の車両アウタ側軸端部における小径ねじ軸３６ｈとスプライン嵌合領域との間の外周領域に、ナット３６ｉの螺合に伴い軸方向の弾性伸長を許容する低剛性部としての軸方向所要長さにわたる小径部分３６ｎを設けた。この小径部分３６ｎは、座繰りにより形成されている。
【００４８】
すなわち、ナット３６ｉの締め付けトルクで外輪軸部３６に引張応力が作用し、この引張応力により中空軸部１２に軸方向圧縮力が作用する場合、前記小径部分３６ｎの剛性が小さいので小径部分が引張応力で軸方向に弾性伸長する結果、ナット３６ｉの締め付けトルクによる中空軸部１２に対する軸方向の圧縮力は下げられる。
【００４９】
これによって、ハブホイール１の中空軸部１２において段壁面１２ｇと車両アウタ側軸端の端面１２ｈとの間の軸方向部分に対して過剰な軸方向圧縮力がかからなくなって、内輪２５に対するかしめ部１２ａからの適正な予圧付与状態を保持することができる。
【００５０】
なお、中空軸部１２の車両アウタ側軸端部１２ｃの端面に、周方向の切り欠き１２ｎが設けられ、この切り欠き１２ｎの内壁面１２ｐにナット３６ｉの端面３６ｊが当てられるから、ナット３６ｉを小さくしてハブユニットの軽量化を図れて好ましい。
【００５１】
本発明は、上述の各実施形態に限定されるものではなく、さらに種々な変形や応用が可能である。
【００５２】
（１）上述の実施形態の場合、ハブホイール１の中空軸部１２の車両インナ側軸端を径方向外向きに屈曲変形してなるかしめ部１２ａと等速ジョイント３の外輪３１における椀型筒部３５との間に僅かの隙間Ｇが存在しているために、この隙間から泥水が浸入し、その中空軸部１２内周と等速ジョイント３の外輪軸部３６の外周とのスプライン間にその泥水が停滞してそこでの腐食が進行するおそれがある。
【００５３】
そこで、この泥水の浸入を防ぐために、図９および図１０で示す環状のシール２０，２１を設けてもよい。
【００５４】
図９は、車両用ハブユニットの縦断側面図、図１０は、各シールの構成例を示すための図９の要部における各拡大図である。
【００５５】
シール２０は、ゴム等の弾性体よりなり、かしめ部１２ａと椀型筒部３５の軸方向対向面間に配設されており、凹部としての環状溝３５ａまたは環状の切り欠き３５ｂに嵌入されて、隙間Ｇを塞いで内部への泥水の浸入を防止している。
【００５６】
シール２１は、ゴム等の弾性体よりなり、スプライン１２ｆ，３６ｆより車両インナ側に位置する中空軸部１２の内周領域と等速ジョイント３の外輪軸部３６の外周領域との対向面に配設されており、凹部としての環状溝３６ｍに嵌入されて、前記中空軸部２１内周領域と、外輪軸部３６の外周領域との間を密封することで、シール２０と共にスプライン１２ｆ，３６ｆ部分への泥水の浸入を防止しそこでの腐食を防止している。
【００５７】
シール２０，２１は、環状芯金にシールリップを固着した形態でもよい。
【００５８】
両シール２０，２１は、必ずしも２つ必要となるものではなく、いずれか一方でもよい。
【００５９】
（２）上述の実施形態の場合、椀型筒部３５とかしめ部１２ａとを非接触としたが、本発明はこれに限定されるものではなく、椀型筒部３５とかしめ部１２ａとが接触される構造のものに対しても、図１で示されるハブホイール１の中空軸部１２に切り欠き１２ｋを設けたり、あるいは、図５で示される等速ジョイント３の外輪軸部３６に小径部分３６ｎを設けることにより、上述の実施形態と同様に、内輪２５に対する予圧に影響を及ぼす余分な負荷がかからないようにしてもよい。
【００６０】
【発明の効果】
以上のように本発明の車両用軸受装置は、等速ジョイントの外輪軸部の車両アウタ側軸端にねじ軸部を設け、このねじ軸部に対してナットを螺合し、このナットをハブホイールの中空軸部の車両アウタ側端面に当てることでハブホイールに等速ジョイントの外輪を結合し、中空軸部の車両アウタ側軸端部寄りに、前記ナットの螺合に伴い軸方向の弾性圧縮を許容する低剛性部を設けて構成されており、ナットをその緩み防止を可能とするトルクで締め付けても低剛性部が車両インナ側方向に弾性圧縮し、ナットの締め付けトルクによる複列転がり軸受に対する予圧への影響を低減することができる。
【図面の簡単な説明】
【図１】本発明の実施形態にかかるハブユニットの縦断側面図
【図２】図１の要部の拡大図
【図３】図１のハブホイールの拡大図
【図４】図１の等速ジョイントの外輪軸部の拡大図
【図５】他の参考形態にかかるハブユニットの縦断側面図
【図６】図５の要部の拡大図
【図７】図５のハブホイールの拡大図
【図８】図５の等速ジョイントの外輪軸部の拡大図
【図９】本発明のさらに他の実施形態にかかるハブユニットの縦断側面図
【図１０】図９の要部を拡大して各シールの変形を示す斜視図
【図１１】従来のハブユニットの縦断側面図
【符号の説明】
１ ハブホイール
２ 複列転がり軸受
３ 等速ジョイント
１２ ハブホイールの中空軸部
３１ 等速ジョイントの外輪軸部
３５ 等速ジョイントの外輪の椀型筒部
３６ 等速ジョイントの外輪の軸部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle bearing device such as a vehicle hub unit to which a disc rotor and wheels of a disc brake device are attached.
[0002]
[Prior art]
In the conventional drive wheel hub unit shown in FIG. 11, a double-row rolling bearing 2 is fitted on the outer periphery of the hollow shaft portion 12 of the hub wheel 1 to which the wheel is attached. The hub wheel 1 is connected to a shaft 7 by a constant velocity joint 3 so as to be tiltable. The vehicle inner side shaft end of the hollow shaft portion 12 of the hub wheel 1 is bent and deformed radially outward to be a caulking portion 12a, and is caulked to the outer end surface of the inner ring 25 of the double row rolling bearing 2, whereby the inner ring 25 is preloaded and retained.
[0003]
The outer ring 31 of the constant velocity joint 3 includes a bowl-shaped cylindrical portion 35 that serves as a trajectory for a tilting ball group, and a small-diameter portion of the outer ring 31 that is inserted into the hollow shaft portion 12 of the hub wheel 1. It is comprised with the axial part 36 which carries out spline fitting.
[0004]
The constant velocity joint 3 is in contact with a caulking portion 12a formed by bending and deforming the vehicle inner side shaft end of the hollow shaft portion 12 of the hub wheel 1 radially outwardly of the saddle-shaped cylinder portion 35. In the state where the end surface of the nut 36i screwed into the small diameter screw shaft portion 36h on the vehicle outer side of the outer ring shaft portion 36 is directed to the end surface 12h of the vehicle outer side opening 12c of the hollow shaft portion 12 of the hub wheel 1, It is connected to the hub wheel 1 by fastening 36i.
[0005]
[Problems to be solved by the invention]
In the case of the hub unit as described above, generally, preload is applied to the double row rolling bearing 2 by caulking the vehicle inner side end portion of the hub wheel 1 to the outer end surface of the inner ring 25 of the double row rolling bearing 2. .
[0006]
Normally, in order to connect the outer ring 31 of the constant velocity joint 3 to the hub wheel 1, the nut 36i is tightened with a required torque so as not to loosen.
[0007]
By the way, as shown in FIG. 11, the caulking portion 12a and the outer ring shaft portion 36 of the constant velocity joint 3 are brought into contact with each other so as to be sandwiched between the vertical tube portion 36 and the nut 36i from the axial direction. In the case of a structure in which 1 and the constant velocity joint 3 are coupled, the tightening torque is applied as an extra load to the double row rolling bearing 2 and may affect the preload.
[0008]
Therefore, as a result of earnest research, the applicant of the present application has come up with a structure capable of reducing the influence of the tightening torque of the nut 36i on the preload, and has completed the present invention.
[0009]
Accordingly, an object of the present invention is to prevent a tightening of a nut from being loosened in a bearing device such as a vehicle hub unit so that the tightening does not affect a preload on a double row rolling bearing.
[0010]
[Means for Solving the Problems]
In the vehicle bearing device of the present invention, a double row rolling bearing is fitted on the outer periphery of a hollow shaft portion of a hub wheel to which a wheel is attached, and the hub wheel is connected to the drive shaft so as to be tiltable. A bearing device for a vehicle having a joint, wherein a vehicle inner side shaft end of a hollow shaft portion of a hub wheel is caulked to an outer end surface of a vehicle inner side inner ring of a double row rolling bearing, and an outer ring of a constant velocity joint is , A cylindrical tube portion serving as a trajectory of the tilt guide ball group, and an outer ring shaft portion that is inserted into the hollow shaft portion of the hub wheel and spline-fitted to the small diameter portion thereof, and the like A screw shaft portion is provided at the vehicle outer side shaft end of the outer ring shaft portion of the speed joint, and a nut is screwed to the screw shaft portion, and this nut is applied to the vehicle outer side end surface of the hollow shaft portion of the hub wheel. thing Constant velocity joint outer ring to the hub wheel and is coupled, circumferential groove cut, which is enlarged from the vehicle outer side end face of the inner peripheral surface of the hollow shaft portion at a position axially spaced apart vehicle inner side to the radially outward It is configured with a notch.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, details of the present invention will be described based on embodiments shown in the drawings.
[0021]
Although the present embodiment will be described with reference to a vehicle hub unit, the present invention is not limited to this and can be applied to a vehicle bearing device.
[0022]
1 to 4 show a vehicle hub unit according to an embodiment of the present invention, FIG. 1 is a longitudinal side view of the vehicle hub unit, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 2 is an enlarged view of the hollow shaft portion of the hub wheel shown in FIG. 2, and FIG. 4 is an enlarged view of the outer ring shaft portion of the constant velocity joint shown in FIG.
[0023]
The vehicle hub unit shown in the figure is a type used on the drive wheel side of an automobile, and includes a hub wheel 1, a double row rolling bearing 2, and a constant velocity joint 3.
[0024]
The hub wheel 1 has a radially outward flange 11 to which a wheel (not shown) is attached, and a hollow shaft portion 12 to which the double-row rolling bearing 2 is fixed to a bearing fitting region on the outer periphery thereof. A raceway surface 22a of one group of balls 22 in the double row rolling bearing 2 is formed near the vehicle outer side of the outer peripheral surface of the hollow shaft portion 12 of the hub wheel 1.
[0025]
The vehicle inner side shaft end of the hollow shaft portion 12 of the hub wheel 1 is a caulking portion 12 a that is bent outward in the radial direction and caulked to the outer end surface of the vehicle inner side inner ring 25 of the double row rolling bearing 2. .
[0026]
The double row rolling bearing 2 includes a single outer ring 21 having two rows of raceway grooves, a plurality of balls 22 as rolling elements arranged in two rows, and two crown-shaped cages 23. As for the two inner rings that are essentially necessary, one of them uses the track surface 22a on the vehicle outer side of the hub wheel 1 as described above, and has only the inner ring 25 on the vehicle inner side. The outer ring 21 is formed with a radially outward flange 24 that is bolted to the vehicle body 6 or the like.
[0027]
The constant velocity joint 3 is, for example, a so-called well-known Zepper type (Barfield type), and includes an outer ring 31, an inner ring 32, a ball 33, a cage 34, and the like.
[0028]
The outer ring 31 includes a bowl-shaped cylinder part 35 in which the inner ring 32, the ball 33, the cage 34, and the like are accommodated, and a shaft part 36 that is integrally connected to the small-diameter side of the bowl-shaped cylinder part 35. Yes.
[0029]
One end of a shaft (drive shaft) 7 is spline fitted to the inner ring 32 and is secured to the inner ring 32 by a retaining ring (not shown). The other end of the shaft 7 is connected via another constant velocity joint (not shown). It is attached to the differential device of the vehicle.
[0030]
The double-row rolling bearing 2 is attached to the outer peripheral surface of the hub wheel 1 and the constant velocity joint 3 is attached to the hub wheel 1 in the state of being close to the double-row rolling bearing 2.
[0031]
Further, bolts 13 for fixing the disc rotor 4 and wheels (not shown) of the disc brake device are attached in a penetrating manner at the circumferential positions of the flange 11.
[0032]
In such a vehicle hub unit, the rotational power of the shaft 7 is transmitted to the wheel (not shown) attached to the hub wheel 1 via the constant velocity joint 3.
[0033]
Next, the outer ring 31 of the constant velocity joint 3 is coupled to the hub wheel 1 in a state where the vertical cylindrical portion 35 of the outer ring 31 of the constant velocity joint 3 is not in contact with the caulking portion 12a by the gap G. .
[0034]
Because of this connection, the midway position 12b in the axial direction in the hollow shaft portion 12 of the hub wheel 1 and the vehicle outer side shaft end 12c are located in the middle in the axial direction 36b in the outer ring shaft portion 36 of the constant velocity joint 3 and the vehicle outer side shaft end 36c. The side is sandwiched from the axial direction.
[0035]
Specifically, in the inner periphery of the hollow shaft portion 12 of the hub wheel 1, a large diameter is formed from the caulking portion 12a that is the vehicle inner side shaft end to the midway position 12b in the axial direction, and from the midway position 12b to the vehicle outer side. The shaft end 12c has a small diameter, and a female spline 12f in which the groove bottom 12d is located on the inner diameter side of the large diameter portion 12e is provided on the smaller diameter side.
[0036]
On the other hand, the outer diameter of the shaft portion 36 of the outer ring 31 of the constant velocity joint 3 has a large diameter from the vehicle inner side shaft end 36a to the middle position 36b and a small diameter from the middle position 36b to the vehicle outer side shaft end 36c. The small-diameter portion is provided with a male spline 36f in which the tooth tip 36d is located on the inner diameter side of the large-diameter portion 36e.
[0037]
Then, the outer ring shaft portion 36 of the constant velocity joint 3 is inserted into the hollow shaft portion 12 of the hub wheel 1 from the vehicle inner side, and the step wall surface 12g of the large diameter portion and the small diameter portion in the hollow shaft portion 12 of the hub wheel 1 is inserted. A vehicle outer side of the outer ring shaft portion 36 in a state where a step wall 36g (middle position in the axial direction) of the large diameter portion and the small diameter portion of the outer ring shaft portion 36 of the constant velocity joint 3 is assigned to (an axial position in the middle). The shaft end 36 c side is positioned with respect to the vehicle outer side shaft end 12 c of the hollow shaft portion 12.
[0038]
For this positioning, a small-diameter screw shaft portion 36 h is provided at the vehicle outer side shaft end 36 c of the outer ring shaft portion 36 of the constant velocity joint 3.
[0039]
The nut 36i is screwed into the small diameter screw shaft portion 36h, and is tightened in a state where the end surface 36j thereof is in contact with the end surface 12h of the vehicle outer side shaft end 12c of the hollow shaft portion 12 of the hub wheel 1. Yes.
[0040]
In the case of the above embodiment, the vertical cylindrical portion 35 in the outer ring 31 of the constant velocity joint 3 is axially connected to the caulking portion 12a that is caulked to the outer end surface 25a of the vehicle outer side inner ring 25 of the double row rolling bearing 2. The outer ring 31 of the constant velocity joint 3 is coupled to the hub wheel 1 in a non-contact state with a gap G therebetween.
[0041]
Therefore, an extra load is not applied to the inner ring 25 from the outer ring shaft portion 36 of the constant velocity joint 3 through the caulking portion 12a, and the preload is properly maintained.
[0042]
In this case, when the tightening torque is increased in order to prevent the nut 36i from loosening, the hollow shaft portion 12 of the hub wheel 1 has an axial portion between the step wall surface 12g and the end surface 12h of the vehicle outer side shaft end 12c. Since all axial compression forces can apply an extra load to the inner ring 25 through the caulking portion 12a, the embodiment has the following configuration.
[0043]
That is, in this embodiment, the inner periphery of the hollow shaft portion 12 is provided as a low-rigidity portion that allows elastic compression in the axial direction along with the screwing of the nut 36i near the vehicle outer side shaft end portion 12c of the hollow shaft portion 12. A circumferential groove notch 12k is provided in a required area on the vehicle outer side on the surface.
[0044]
By this notch 12k, the vehicle outer side shaft end 12c can be elastically compressed in accordance with the magnitude of the tightening torque of the nut 36i.
[0045]
Since the tightening torque of the nut 36i is absorbed by the elastic compression of the vehicle outer side shaft end portion 12c in the vehicle inner side direction, the stepped wall surface 12g and the end surface 12h of the vehicle outer side shaft end are formed in the hollow shaft portion 12 of the hub wheel 1. Therefore, an excessive axial compressive force is not applied to the axial portion between the inner ring 25 and the inner ring 25, so that an appropriate preload can be applied to the inner ring 25.
[0046]
A vehicle hub unit according to a reference embodiment of the present invention will be described with reference to FIGS. 5 is a longitudinal side view of the vehicle hub unit, FIG. 6 is an enlarged view of the main part of FIG. 5, FIG. 7 is an enlarged view of the hollow shaft portion of the hub wheel shown in FIG. FIG. 7 is an enlarged view of an outer ring shaft portion of the constant velocity joint shown in FIG. 6, and portions corresponding to those in FIGS. 1 to 4 are denoted by the same reference numerals.
[0047]
In the present embodiment, as shown in FIGS. 5 to 8, the nut 36i is screwed into the outer peripheral region between the small diameter screw shaft 36h and the spline fitting region at the vehicle outer side shaft end portion of the outer ring shaft portion 36. Along with this, a small-diameter portion 36n is provided over the required length in the axial direction as a low-rigidity portion that allows elastic stretching in the axial direction . The small diameter portion 36n is formed by countersink.
[0048]
That is, when a tensile stress acts on the outer ring shaft portion 36 with the tightening torque of the nut 36i and an axial compressive force acts on the hollow shaft portion 12 due to this tensile stress, the small-diameter portion 36n has low rigidity, so the small-diameter portion is pulled. As a result of elastic elongation in the axial direction due to the stress, the axial compressive force on the hollow shaft portion 12 due to the tightening torque of the nut 36i is lowered.
[0049]
As a result, in the hollow shaft portion 12 of the hub wheel 1, excessive axial compression force is not applied to the axial portion between the step wall surface 12 g and the end surface 12 h of the vehicle outer side shaft end, and the inner ring 25 is caulked. An appropriate preload application state from the portion 12a can be maintained.
[0050]
In addition, since the notch 12n of the circumferential direction is provided in the end surface of the vehicle outer side shaft end part 12c of the hollow shaft part 12, and the end surface 36j of the nut 36i is applied to the inner wall surface 12p of this notch 12n, the nut 36i is attached. It is preferable that the hub unit can be made lighter and lighter.
[0051]
The present invention is not limited to the above-described embodiments, and various modifications and applications can be made.
[0052]
(1) In the case of the above-described embodiment, the caulking portion 12a formed by bending and deforming the vehicle inner side shaft end of the hollow shaft portion 12 of the hub wheel 1 radially outward and the saddle type tube in the outer ring 31 of the constant velocity joint 3 Since there is a slight gap G between the gap 35 and the portion 35, muddy water enters through the gap, and between the spline between the inner circumference of the hollow shaft portion 12 and the outer circumference of the outer ring shaft portion 36 of the constant velocity joint 3. The muddy water may stagnate and corrosion may proceed there.
[0053]
Therefore, in order to prevent this muddy water from entering, annular seals 20 and 21 shown in FIGS. 9 and 10 may be provided.
[0054]
FIG. 9 is a longitudinal side view of the vehicle hub unit, and FIG. 10 is an enlarged view of a main part of FIG. 9 for illustrating a configuration example of each seal.
[0055]
The seal 20 is made of an elastic body such as rubber, and is disposed between the caulking portion 12a and the saddle-shaped cylindrical portion 35 in the axially opposed surfaces, and is fitted into an annular groove 35a or an annular notch 35b as a recess. The gap G is closed to prevent muddy water from entering the interior.
[0056]
The seal 21 is made of an elastic body such as rubber, and is disposed on a facing surface between the inner peripheral region of the hollow shaft portion 12 located on the vehicle inner side with respect to the splines 12f and 36f and the outer peripheral region of the outer ring shaft portion 36 of the constant velocity joint 3. It is inserted into an annular groove 36m as a recess and seals between the inner peripheral region of the hollow shaft portion 21 and the outer peripheral region of the outer ring shaft portion 36, so that the splines 12f and 36f portions together with the seal 20 This prevents muddy water from entering and prevents corrosion there.
[0057]
The seals 20 and 21 may have a form in which a seal lip is fixed to an annular cored bar.
[0058]
Two seals 20 and 21 are not necessarily required, and either one may be used.
[0059]
(2) In the case of the above-described embodiment, the saddle-shaped cylinder portion 35 and the caulking portion 12a are not in contact, but the present invention is not limited to this, and the saddle-shaped cylinder portion 35 and the caulking portion 12a include For the contact structure, a notch 12k is provided in the hollow shaft portion 12 of the hub wheel 1 shown in FIG. 1, or the outer ring shaft portion 36 of the constant velocity joint 3 shown in FIG. By providing the portion 36n, as in the above-described embodiment, an extra load that affects the preload on the inner ring 25 may not be applied.
[0060]
【The invention's effect】
As described above, in the vehicle bearing device of the present invention, the screw shaft portion is provided at the vehicle outer side shaft end of the outer ring shaft portion of the constant velocity joint, and the nut is screwed to the screw shaft portion. The outer ring of the constant velocity joint is coupled to the hub wheel by hitting the end surface of the hollow shaft of the wheel on the outer side of the vehicle. It is configured with a low-rigidity part that allows compression, and even if the nut is tightened with a torque that prevents it from loosening, the low-rigidity part elastically compresses in the vehicle inner side direction, and double row rolling due to the tightening torque of the nut The influence on the preload on the bearing can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a hub unit according to an embodiment of the present invention. FIG. 2 is an enlarged view of a main part of FIG. 1. FIG. 3 is an enlarged view of a hub wheel of FIG. Enlarged view of the outer ring shaft of the joint [Fig. 5] Vertical side view of the hub unit according to another reference embodiment [Fig. 6] Enlarged view of the main part of Fig. 5 [Fig. 7] Enlarged view of the hub wheel of Fig. 5 8 is an enlarged view of the outer ring shaft portion of the constant velocity joint of FIG. 5. FIG. 9 is a vertical side view of a hub unit according to still another embodiment of the present invention. FIG. 11 is a perspective view showing a modification of the conventional hub unit.
DESCRIPTION OF SYMBOLS 1 Hub wheel 2 Double row rolling bearing 3 Constant velocity joint 12 Hollow shaft part of hub wheel 31 Outer ring shaft part of constant speed joint 35 Vertical cylindrical part of outer ring of constant speed joint 36 Shaft part of outer ring of constant velocity joint

Claims (1)

車輪が取り付けられるハブホイールの中空軸部の外周に複列転がり軸受が外嵌装着され、また、このハブホイールを駆動軸に対して傾動可能に連結する等速ジョイントを備えた車両用軸受装置であって、
ハブホイールの中空軸部における車両インナ側軸端が複列転がり軸受の車両インナ側内輪の外端面にかしめつけられており、
等速ジョイントの外輪が、傾動案内用のボール群の軌道となる椀型の筒部とこれの小径部分にハブホイールの中空軸部に挿入されてスプライン嵌合する外輪軸部とを有する構成とされており、
前記等速ジョイントの外輪軸部の車両アウタ側軸端にねじ軸部が設けられ、このねじ軸部に対してナットが螺合され、このナットがハブホイールの中空軸部の車両アウタ側端面に当てられることでハブホイールに等速ジョイントの外輪が結合されており、
中空軸部の内周面の車両アウタ側端面から軸方向車両インナ側に離れた位置に径方向外方へ拡径された周溝状切欠きを設けた、ことを特徴とする車両用軸受装置。A vehicle bearing device including a double-row rolling bearing fitted on the outer periphery of a hollow shaft portion of a hub wheel to which a wheel is attached, and a constant velocity joint that tiltably connects the hub wheel to a drive shaft. There,
The vehicle inner side shaft end of the hollow shaft portion of the hub wheel is caulked to the outer end surface of the vehicle inner side inner ring of the double row rolling bearing,
The outer ring of the constant velocity joint has a saddle-shaped cylindrical part that serves as a trajectory of a tilting ball group, and an outer ring shaft part that is inserted into the hollow shaft part of the hub wheel at a small diameter part thereof and is spline-fitted. Has been
A screw shaft portion is provided at the vehicle outer side shaft end of the outer ring shaft portion of the constant velocity joint, and a nut is screwed to the screw shaft portion, and this nut is fitted to the vehicle outer side end surface of the hollow shaft portion of the hub wheel. The outer ring of the constant velocity joint is connected to the hub wheel by being hit,
A vehicular bearing device, characterized in that a circumferential groove-shaped notch that is radially outwardly expanded is provided at a position away from the vehicle outer side end surface of the inner peripheral surface of the hollow shaft portion toward the axial vehicle inner side. .
JP2000262547A 2000-08-31 2000-08-31 Vehicle bearing device Expired - Fee Related JP3822041B2 (en)

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Publication number Priority date Publication date Assignee Title
US8083598B2 (en) 2006-07-11 2011-12-27 Ntn Corporation Bearing device for wheel
KR100925751B1 (en) * 2007-11-16 2009-11-11 주식회사 일진글로벌 Hub for wheel bearing
JP5393997B2 (en) * 2008-04-22 2014-01-22 Ｎｔｎ株式会社 Wheel bearing device
JP5217861B2 (en) * 2008-10-01 2013-06-19 株式会社ジェイテクト Connecting structure and steering device

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Publication number Priority date Publication date Assignee Title
US4371214A (en) * 1980-11-17 1983-02-01 Motor Wheel Corporation Bearing hub and carrier assembly for a driven steering wheel unit
DE3636243A1 (en) * 1986-10-24 1988-05-11 Loehr & Bromkamp Gmbh WHEEL BEARING (NY) SMOOTH JOINT UNIT
JPH022527U (en) * 1988-06-17 1990-01-09
JPH05319008A (en) * 1992-05-15 1993-12-03 Nippon Seiko Kk Bearing unit with wheel balance adjusting function
JPH0996317A (en) * 1995-09-29 1997-04-08 Ntn Corp Outer ring for constant velocity joint
DE19543436C2 (en) * 1995-11-22 2000-10-12 Fag Automobiltechnik Ag Wheel bearings
JP3533883B2 (en) * 1997-06-16 2004-05-31 日本精工株式会社 Hub unit for wheel support
JP3982093B2 (en) * 1998-02-16 2007-09-26 日本精工株式会社 Wheel drive axle unit
JP2000062405A (en) * 1998-08-25 2000-02-29 Nippon Seiko Kk Axle device for automobile

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