JP4000751B2 - Hub unit for vehicles - Google Patents

Hub unit for vehicles Download PDF

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Publication number
JP4000751B2
JP4000751B2 JP2000158184A JP2000158184A JP4000751B2 JP 4000751 B2 JP4000751 B2 JP 4000751B2 JP 2000158184 A JP2000158184 A JP 2000158184A JP 2000158184 A JP2000158184 A JP 2000158184A JP 4000751 B2 JP4000751 B2 JP 4000751B2
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Prior art keywords
hub wheel
hub
constant velocity
velocity joint
caulking
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JP2000158184A
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JP2001334806A (en
Inventor
孝爾 嶋
一寿 戸田
信一郎 柏木
匡 御手洗
大策 冨田
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JTEKT Corp
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JTEKT Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0078—Hubs characterised by the fixation of bearings
    • B60B27/0084—Hubs characterised by the fixation of bearings caulking to fix inner race
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/02—Special design or construction
    • B21J9/025—Special design or construction with rolling or wobbling dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K25/00—Uniting components to form integral members, e.g. turbine wheels and shafts, caulks with inserts, with or without shaping of the components
    • 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
    • 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
    • F16C19/187—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 all four raceways integrated on parts other than race rings, e.g. fourth 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
    • 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
    • F16C43/00—Assembling bearings
    • F16C43/04—Assembling rolling-contact bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

Description

【０００１】
【発明の属する技術分野】
本発明は、自動車におけるディスクブレーキ装置のディスクロータや車輪が取り付けられる車両用ハブユニットに関する。
【０００２】
【従来の技術】
一般的に、車両用ハブユニットは、自動車の従動輪側に用いるタイプと、駆動輪側に用いるタイプとに大別される。従動輪タイプとしては、本発明の実施形態２に係る図３に示すように、ハブホイールの外周に複列転がり軸受を取り付けた構造になっている。また、駆動輪タイプとしては、本発明の実施形態１に係る図１に示すように、ハブホイールの外周に複列転がり軸受をまたハブホイールの内周に等速ジョイントを取り付けた構造になっている。
【０００３】
通常、ハブホイールの外周面には、自動車におけるディスクブレーキ装置のディスクロータや車輪を取り付けるための径方向外向きのフランジが設けられる。
【０００４】
そして、従動輪タイプのハブユニットの構造では、ハブホイールの内端部を径方向外向きに屈曲変形させて、複列転がり軸受の内輪に対してかしめつけることにより、ハブホイールに対して複列転がり軸受を抜け止めするとともに、複列転がり軸受に対して所要の予圧（圧縮応力）を付与するようになっている。
【０００５】
一方、駆動輪タイプのハブユニットの構造では、等速ジョイントの外輪の軸部における外端部を径方向外向きに屈曲変形させて、ハブホイールの外端面に対してかしめつけることにより、ハブホイールと等速ジョイントの外輪とで複列転がり軸受を挟持するとともに、複列転がり軸受に対して所要の予圧（圧縮応力）を付与するようになっている。
【０００６】
【発明が解決しようとする課題】
上記従来例では、いずれのタイプのハブユニットであっても、かしめ部分に対して水分がかかると、ハブホイールと等速ジョイントの外輪との嵌合面、あるいはハブホイールと複列転がり軸受の内輪との嵌合面にまで染み込んでしまい、そこに錆などが発生するおそれがあるなど、好ましくない。
【０００７】
また、かしめ部分から侵入した水分は、時間経過に伴い複列転がり軸受の内部にまで入り込んで、潤滑剤を劣化させることにもなりかねない。
【０００８】
このような事情に鑑み、本発明は、車両用ハブユニットにおいて、かしめ部分からの水分侵入を防止し、各部の品質を長期にわたって維持することを解決すべき課題とする。
【０００９】
【課題を解決するための手段】
本発明第１の車両用ハブユニットは、ハブホイールの外周に複列転がり軸受が、また、ハブホイールの内周に等速ジョイントがそれぞれ配設され、かつ、ハブホイールの外周面に径方向外向きのフランジが一体形成された車両用ハブユニットであって、前記複列転がり軸受が、ハブホイールの内周に嵌合される等速ジョイントの外輪における軸部の外端部を径方向外向きに屈曲変形させてハブホイールの軸方向一端側の端面に対してかしめつけることにより軸方向に抜け止めされているとともに、前記等速ジョイントの外輪において屈曲変形されたかしめ部とそれがかしめつけられるハブホイールの軸方向一端側の端面との間のみに、弾性シール材が圧縮変形させられた状態で挟持されている、ことを特徴としている。
【００１２】
本発明第２の車両用ハブユニットは、上記第１の構成において、前記等速ジョイントの外輪が、内周面に傾動案内要素を収納する椀形部と、この椀形部の小径部分に連接される円筒軸部とを有し、この円筒軸部の外周と前記ハブホイールの内周とがスプライン嵌合されており、
前記複列転がり軸受が、二列の軌道溝を有する単一の外輪と、二列で配設される複数の転動体とを有し、前記ハブホイールの外周面の所要領域が前記片方列の転動体群の軌道面とされるとともに、前記等速ジョイントの外輪の外周面における所要領域を前記他方列の転動体群の軌道面とされるものである、ことを特徴としている。
【００１４】
以上、要するに、本発明では、複列転がり軸受の抜け止めをかしめにより行うようにした構造において、かしめ部分に弾性シール材を介在させることにより、かしめ部分からの水分侵入を防止するようにしている。
【００１５】
そして、上記第１の構成は、本発明の車両ハブユニットの前提構成を特定したものであり、各前提構成でのかしめ形態を特定するとともに、弾性シール材の配設位置を特定している。これらの構成であれば、かしめ部分からの水分侵入を防止できることに伴い、かしめ部分に連なる隙間から複列転がり軸受の内部への水分侵入が避けられるようになる。
【００１６】
【発明の実施の形態】
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。
【００１７】
図１は本発明の一実施形態に係る車両用ハブユニットを示す断面図である。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り、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。
【００１８】
ハブホイール１は、中空構造であり、外周面の軸方向中間部に径方向外向きのフランジ１１が、また、中空部内周面の所要領域にメススプラインが、さらに、外周面の内端部に複列転がり軸受２における片方列の玉２２群の軌道面１２がそれぞれ形成されている。なお、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。５はブレーキパッドである。
【００１９】
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、二列で配設される転動体としての複数の玉２２、二つの冠形保持器２３を有しており、本来必要な２つの内輪については、ハブホイール１の外周面および等速ジョイント３の外周面を利用する構成になっている。なお、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。
【００２０】
等速ジョイント３は、周知のツェッパタイプ（バーフィールド型）等速ジョイントと呼ばれるものとされ、外輪３１、内輪３２、玉３３、保持器３４などを有している。なお、外輪３１は、内輪３２、玉３３、保持器３４などが収納配設される椀形部３５と、この椀形部３５の小径側に一体に連接される円筒軸部３６とを有している。椀形部３５の外周面には、複列転がり軸受２における片方列の玉２２群の軌道面３７が設けられており、また、円筒軸部３６の外周面における所要領域には、ハブホイール１のメススプラインに嵌合されるオススプラインが形成されている。さらに、内輪３２には、シャフト７の一端側がスプライン嵌合されるとともに止め輪などで抜け止め固定されていて、このシャフト７の他端側が、図示しないが、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。
【００２１】
そして、ハブホイール１の外周面に複列転がり軸受２を、また、ハブホイール１の内周面に等速ジョイント３をそれぞれ取り付けた状態で、等速ジョイント３の外輪３１における円筒軸部３６の外端部を径方向外向きに屈曲して、ハブホイール１の外端面に対してかしめつけることにより、ハブホイール１と等速ジョイント３の外輪３１とで複列転がり軸受２を軸方向から挟持する形態にして、複列転がり軸受２に対して所要の予圧（圧縮応力）を付与するようになっている。なお、かしめ部には、符号３８を付してある。
【００２２】
このようなハブユニットでは、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。
【００２３】
ところで、この実施形態１では、ハブホイール１の外端面と、そこにかしめつけられる等速ジョイント３における外輪３１のかしめ部３８との接触部分に、例えばＯリングなどの弾性シール材８を介在させている、ことを特徴としている。
【００２４】
このように弾性シール材８を装着するには、後で説明するが、例えば、等速ジョイント３の外輪３１における円筒軸部３６の外端部を径方向外向きに屈曲するかしめ作業を行うときに、予め、この外輪３１における円筒軸部３６の外周面の外端部に対して弾性シール材８を取り付けておけばよい。
【００２５】
また、上記かしめ作業について説明する。
【００２６】
ここでは、図２に示すように、かしめ受け冶具４０および拘束リング４１を用いる。まず、基台４２上にかしめ受け冶具４０を介して仮組みした車両用ハブユニットの全体を載せる。このとき、かしめ受け冶具４０の搭載面４０ａに対して外輪３１の冶具受け面３９をあてがって、外輪３１を基台４２から浮かせた状態にする。
【００２７】
なお、上記等速ジョイント３の外輪３１における椀形部３５の内周奥壁には、前述したかしめ受け冶具４０があてがわれる冶具受け面３９が予め形成されている。
【００２８】
次いで、ハブホイール１の外周面においてディスクロータ４や車輪（図示省略）が外嵌される外端部に対して、拘束リング４１を取り付ける。この拘束リング４１は、ハブホイール１のフランジ１１においてディスクロータ４があてがわれる面が、かしめによって歪むことを防止するために用いられる。
【００２９】
このような状態において、外輪３１における円筒軸部３６の外周面の外端部に対して弾性シール材８を取り付けてから、かしめ冶具４３を所要圧力Ｐ１で加圧しながら中心Ｏに対して所要角度θを付けてローリングさせる。これにより、外輪３１における円筒軸部３６の外端部が径方向外向きに屈曲変形されて、ハブホイール１の外端面に対してかしめつけられるとともに、この屈曲変形により形成されたかしめ部３８とハブホイール１の外側端面との間に弾性シール材８が圧縮変形させられた状態で挟持される。
【００３０】
このローリングかしめ過程において、かしめ荷重Ｐ１は、それと軸方向で正対する外輪３１の冶具受け面３９に作用するが、この冶具受け面３９がかしめ受け冶具４０の搭載面４０ａで支持されているので、この搭載面４０ａからの反力Ｐ２は前記かしめ荷重Ｐ１と軸方向でほぼ一致する結果、等速ジョイント３にはかしめ時における偶力が発生せずに済む。また、拘束リング４１でハブホイール１の外周面においてディスクロータ４や車輪（図示省略）が外嵌される外端部を受けているので、かしめ時においてハブホイール１のフランジ１１においてディスクロータ４があてがわれる面が歪むことが防止されることになる。これにより、ディスクロータ４の回転振れを抑制できるようになる。
【００３１】
以上説明したように、上記実施形態１では、ハブホイール１の外端面と、そこにかしめつけられる等速ジョイント３における外輪３１のかしめ部３８との接触部分に、弾性シール材８を介在させているから、ここに水分がかかったとしても、この水分がかしめ部３８からハブホイール１と等速ジョイント３の外輪３１における円筒軸部３６とのスプライン嵌合部分に対して侵入することを確実に防止できるようになり、錆による品質低下を回避できるようになる。これにより、必然的に、複列転がり軸受２の内部に対する水分侵入が避けられるから、軸受の寿命向上に貢献できるようになる。しかも、弾性シール材８をかしめ部分に介在させていても、かしめにより弾性シール材８が押し潰されるから、かしめによる軸力の付与度合いが低下するといった不具合の発生も回避される。
【００３２】
図３は、本発明の参考形態としての実施形態２に係るハブユニットを示す断面図である。この実施形態２のハブユニットは、自動車の従動輪側に用いら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とで構成されており、上記実施形態１と異なり、等速ジョイント３は用いられていない。但し、発明の本質は、上記実施形態１と基本的に同じである。
【００３３】
これらハブホイール１と複列転がり軸受２は、上記実施形態１で説明したものと基本的に同じ構成であるが、細部において若干相違している。ここでのハブホイール１は、中実構造とされていて、その軸部の外周面に複列転がり軸受２の一方の内輪となる軌道面を形成したような構造であり、複列転がり軸受２は、単一の内輪２５を備えている。
【００３４】
そして、ハブホイール１における軸部の内端部を、径方向外向きに屈曲変形させて複列転がり軸受２の内輪２５の端面に対してかしめつけることにより、ハブホイール１に対して複列転がり軸受２を一体化するようになっている。なお、ハブホイール１のかしめ部に符号１５を付している。
【００３５】
このような構成において、内輪２５とかしめ部１５との接触部分に弾性シール材８が圧縮状態で挟持されている。
【００３６】
この実施形態２でのかしめ形態について説明する。ここでは、図４に示すように、基台４２上に仮組みした車両用ハブユニットの全体を載せる。このような状態において、ハブホイール１の軸部の内端部の外周面に対して弾性シール材８を取り付けてから、かしめ冶具４３を所要圧力で加圧しながら中心Ｏに対して所要角度θを付けてローリングさせる。これにより、ハブホイール１における軸部の内端部が径方向外向きに屈曲変形されて、複列転がり軸受２の内輪２５の端面に対してかしめつけられるとともに、この屈曲変形により形成されたかしめ部１５と内輪２５の端面との間に弾性シール材８が圧縮変形させられた状態で挟持される。
【００３７】
このローリングかしめ過程において、かしめ荷重は、内輪２５からハブホイール１に作用するが、このハブホイール１が中実であるから、ハブホイール１全体に作用する結果、ハブホイール１のフランジ１１にはかしめ時における偶力が発生せずに済む。
【００３８】
以上説明したように、上記実施形態１では、複列転がり軸受２の内輪２５と、そこにかしめつけられるハブホイール１における軸部のかしめ部１５との接触部分に、弾性シール材８を介在させているから、ここに水分がかかったとしても、この水分がかしめ部３８から内輪２５とハブホイール１の軸部との嵌合部分に対して侵入することを確実に防止できるようになり、錆による品質低下を回避できるようになる。これにより、必然的に、複列転がり軸受２の内部に対する水分侵入が避けられるから、軸受の寿命向上に貢献できるようになる。しかも、弾性シール材８をかしめ部分に介在させていても、かしめにより弾性シール材８が押し潰されるから、かしめによる軸力の付与度合いが低下するといった不具合の発生も回避される。
【００３９】
なお、本発明のハブユニットの構成は、上記実施形態１，２で例示したものの他にいろいろ考えられるが、それらのすべてに対して同様に本発明を適用できる。また、上記各実施形態では、弾性シール材８として、Ｏリングを例に挙げたが、固形シール体あるいは液状硬化性シール体とすることができる。
【００４０】
【発明の効果】
本発明では、かしめ部分に弾性シール材を介在させるようにしているから、ここからの水分侵入を確実に防止できるようになり、錆などの品質低下を回避できるようになる。これに伴い、かしめ部分に連なる隙間から複列転がり軸受の内部への水分侵入が避けられるようになる。さらに、弾性シール材をかしめ部分に介在させていても、かしめにより弾性シール材が押し潰されるから、かしめによる軸力の付与度合いが低下するといった不具合の発生も回避される。
【００４２】
また、請求項１および２の発明に係る車両用ハブユニットでは、かしめ部からハブホイールと等速ジョイントの外輪における軸部との嵌合部分に対して水分が侵入することを確実に防止できるようになる。
【００４３】
このように、本発明では、車両用ハブユニットの各部の品質を長期にわたって維持できるようになり、信頼性向上に貢献できる。
【図面の簡単な説明】
【図１】本発明の実施形態１に係るハブユニットを示す断面図
【図２】図１のハブユニットでのかしめ形態を示す説明図
【図３】本発明の実施形態２に係るハブユニットを示す断面図
【図４】図３のハブユニットでのかしめ形態を示す断面図
【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
４ ディスクロータ
８ 弾性シール材
１１ ハブホイールのフランジ
３１ 等速ジョイントの外輪
３６ 外輪の円筒軸部
３８ 円筒軸部のかしめ部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle hub unit to which a disc rotor and wheels of a disc brake device in an automobile are attached.
[0002]
[Prior art]
Generally, the vehicle hub unit is roughly classified into a type used on the driven wheel side of an automobile and a type used on the drive wheel side. As the driven wheel type, as shown in FIG. 3 according to Embodiment 2 of the present invention, a double row rolling bearing is attached to the outer periphery of the hub wheel. Further, as shown in FIG. 1 according to the first embodiment of the present invention, the drive wheel type has a structure in which a double row rolling bearing is attached to the outer periphery of the hub wheel and a constant velocity joint is attached to the inner periphery of the hub wheel. Yes.
[0003]
Usually, the outer peripheral surface of the hub wheel is provided with a radially outward flange for mounting a disc rotor and a wheel of a disc brake device in an automobile.
[0004]
In the structure of the driven wheel type hub unit, the inner end of the hub wheel is bent and deformed radially outward, and is caulked against the inner ring of the double row rolling bearing. The rolling bearing is prevented from coming off, and a required preload (compressive stress) is applied to the double row rolling bearing.
[0005]
On the other hand, in the structure of the drive wheel type hub unit, the outer end of the shaft portion of the outer ring of the constant velocity joint is bent and deformed outward in the radial direction, and caulked against the outer end surface of the hub wheel, thereby And the outer ring of the constant velocity joint sandwich the double row rolling bearing and apply a required preload (compressive stress) to the double row rolling bearing.
[0006]
[Problems to be solved by the invention]
In the above conventional example, in any type of hub unit, when moisture is applied to the caulking portion, the fitting surface between the hub wheel and the outer ring of the constant velocity joint, or the inner ring of the hub wheel and the double row rolling bearing. It is not preferable because it may penetrate into the mating surface and may cause rust or the like.
[0007]
Further, the moisture that has entered from the caulking portion may enter the inside of the double row rolling bearing with the passage of time, and may deteriorate the lubricant.
[0008]
In view of such circumstances, an object of the present invention is to prevent moisture intrusion from a caulking portion and maintain the quality of each portion over a long period of time in a vehicle hub unit.
[0009]
[Means for Solving the Problems]
The first vehicle hub unit of the present invention has a double-row rolling bearing on the outer periphery of the hub wheel, a constant velocity joint on the inner periphery of the hub wheel, and a radially outer surface on the outer peripheral surface of the hub wheel. A hub unit for a vehicle in which a flange of a direction is integrally formed, wherein the double row rolling bearing has an outer end portion of a shaft portion in an outer ring of a constant velocity joint fitted to an inner periphery of a hub wheel, radially outward. Is bent and deformed to be crimped against the end face on one end side in the axial direction of the hub wheel, and is prevented from coming off in the axial direction, and the caulked portion that is bent and deformed in the outer ring of the constant velocity joint is caulked. The elastic seal material is sandwiched in a compressed and deformed state only between an end surface on one end side in the axial direction of the hub wheel .
[0012]
According to a second vehicle hub unit of the present invention, in the first configuration, the outer ring of the constant velocity joint is connected to a hook-shaped portion that houses the tilt guide element on the inner peripheral surface, and a small-diameter portion of the hook-shaped portion. And the outer periphery of the cylindrical shaft portion and the inner periphery of the hub wheel are spline-fitted,
The double row rolling bearing has a single outer ring having two rows of raceway grooves and a plurality of rolling elements arranged in two rows, and a required area of the outer peripheral surface of the hub wheel is the one row. In addition to being a raceway surface of the rolling element group, a required region on the outer peripheral surface of the outer ring of the constant velocity joint is a raceway surface of the other row of rolling element groups.
[0014]
In short, in the present invention, in the structure in which the double row rolling bearing is prevented from coming off by caulking, the intrusion of moisture from the caulking part is prevented by interposing the elastic sealing material in the caulking part. .
[0015]
And the said 1st structure specifies the premise structure of the vehicle hub unit of this invention, specifies the crimping form in each premise structure, and specifies the arrangement | positioning position of an elastic sealing material. With these configurations, intrusion of moisture from the caulking portion can be prevented, and intrusion of moisture into the double row rolling bearing from the gap connected to the caulking portion can be avoided.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
The details of the present invention will be described based on embodiments shown in the drawings.
[0017]
FIG. 1 is a sectional view showing a vehicle hub unit according to an embodiment of the present invention. The vehicle hub unit shown in the figure is a type used on the driving wheel side of an automobile, and includes a hub wheel 1, a double row rolling bearing 2, and a constant velocity joint 3.
[0018]
The hub wheel 1 has a hollow structure, a radially outward flange 11 at an axially intermediate portion of the outer peripheral surface, a female spline at a required region of the inner peripheral surface of the hollow portion, and further at an inner end portion of the outer peripheral surface. In the double row rolling bearing 2, raceway surfaces 12 of one group of balls 22 are formed. Note that bolts 13 for fixing the disc rotor 4 and wheels (not shown) of the disc brake device are attached in a penetrating manner at circumferential positions of the flange 11. Reference numeral 5 denotes a brake pad.
[0019]
The double row rolling bearing 2 has 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. About two required inner rings, the outer peripheral surface of the hub wheel 1 and the outer peripheral surface of the constant velocity joint 3 are used. The outer ring 21 is formed with a radially outward flange 24 that is bolted to the vehicle body 6 or the like.
[0020]
The constant velocity joint 3 is called a well-known Rzeppa type (Barfield type) constant velocity joint, and includes an outer ring 31, an inner ring 32, a ball 33, a cage 34, and the like. The outer ring 31 has a bowl-shaped part 35 in which an inner ring 32, a ball 33, a retainer 34, and the like are accommodated and a cylindrical shaft part 36 integrally connected to the small-diameter side of the bowl-shaped part 35. ing. The outer peripheral surface of the bowl-shaped portion 35 is provided with a raceway surface 37 of one group of balls 22 in the double-row rolling bearing 2, and the hub wheel 1 is provided in a required region on the outer peripheral surface of the cylindrical shaft portion 36. A male spline to be fitted to the female spline is formed. Further, one end side of the shaft 7 is spline-fitted to the inner ring 32 and secured to the inner ring 32 by a retaining ring or the like, and the other end side of the shaft 7 is not shown but is connected to the vehicle via another constant velocity joint. It is attached to the differential device.
[0021]
Then, with the double row rolling bearing 2 attached to the outer peripheral surface of the hub wheel 1 and the constant velocity joint 3 attached to the inner peripheral surface of the hub wheel 1, the cylindrical shaft portion 36 of the outer ring 31 of the constant velocity joint 3 is provided. The double row rolling bearing 2 is sandwiched from the axial direction by the hub wheel 1 and the outer ring 31 of the constant velocity joint 3 by bending the outer end portion radially outward and caulking the outer end surface of the hub wheel 1. In this manner, a required preload (compressive stress) is applied to the double row rolling bearing 2. The caulking portion is denoted by reference numeral 38.
[0022]
In such a hub unit, the rotational power of the shaft 7 is transmitted to a wheel (not shown) attached to the hub wheel 1 via the constant velocity joint 3.
[0023]
By the way, in the first embodiment, an elastic sealing material 8 such as an O-ring is interposed between the outer end surface of the hub wheel 1 and the contact portion between the caulking portion 38 of the outer ring 31 in the constant velocity joint 3 to be caulked there. It is characterized by that.
[0024]
In order to mount the elastic seal material 8 in this way, as will be described later, for example, when performing a caulking operation to bend the outer end portion of the cylindrical shaft portion 36 in the outer ring 31 of the constant velocity joint 3 radially outward. In addition, the elastic sealing material 8 may be attached to the outer end portion of the outer peripheral surface of the cylindrical shaft portion 36 in the outer ring 31 in advance.
[0025]
The caulking operation will be described.
[0026]
Here, as shown in FIG. 2, a caulking receiving jig 40 and a restraining ring 41 are used. First, the entire vehicle hub unit temporarily assembled through the caulking receiving jig 40 is placed on the base 42. At this time, the jig receiving surface 39 of the outer ring 31 is applied to the mounting surface 40 a of the caulking receiving jig 40, so that the outer ring 31 is lifted from the base 42.
[0027]
A jig receiving surface 39 to which the above-described caulking receiving jig 40 is applied is formed in advance on the inner peripheral back wall of the bowl-shaped portion 35 in the outer ring 31 of the constant velocity joint 3.
[0028]
Next, a restraining ring 41 is attached to an outer end portion on which the disc rotor 4 and wheels (not shown) are fitted on the outer peripheral surface of the hub wheel 1. This restraining ring 41 is used to prevent the surface of the flange 11 of the hub wheel 1 to which the disk rotor 4 is applied from being distorted by caulking.
[0029]
In such a state, after attaching the elastic sealing material 8 to the outer end portion of the outer peripheral surface of the cylindrical shaft portion 36 in the outer ring 31, the required angle with respect to the center O while pressurizing the caulking jig 43 with the required pressure P1. Roll with θ. Thereby, the outer end portion of the cylindrical shaft portion 36 in the outer ring 31 is bent and deformed outward in the radial direction, and is caulked against the outer end surface of the hub wheel 1, and the caulking portion 38 formed by this bending deformation and The elastic sealing material 8 is sandwiched between the outer end face of the hub wheel 1 in a state of being compressed and deformed.
[0030]
In this rolling caulking process, the caulking load P1 acts on the jig receiving surface 39 of the outer ring 31 facing directly in the axial direction, but the jig receiving surface 39 is supported by the mounting surface 40a of the caulking receiving jig 40. The reaction force P2 from the mounting surface 40a substantially coincides with the caulking load P1 in the axial direction, so that no couple force is generated in the constant velocity joint 3 during caulking. Further, since the outer periphery of the hub wheel 1 is received by the restraining ring 41 on the outer peripheral surface of the hub wheel 1, the disk rotor 4 is attached to the flange 11 of the hub wheel 1 during caulking. It is possible to prevent the applied surface from being distorted. As a result, the rotational shake of the disk rotor 4 can be suppressed.
[0031]
As described above, in the first embodiment, the elastic seal material 8 is interposed between the outer end surface of the hub wheel 1 and the contact portion between the caulking portion 38 of the outer ring 31 in the constant velocity joint 3 that is caulked there. Therefore, even if moisture is applied here, it is ensured that this moisture enters the caulking portion 38 into the spline fitting portion between the hub wheel 1 and the cylindrical shaft portion 36 in the outer ring 31 of the constant velocity joint 3. It becomes possible to prevent the deterioration of quality due to rust. This inevitably prevents moisture from entering the inside of the double row rolling bearing 2, thereby contributing to an improvement in bearing life. In addition, even if the elastic sealing material 8 is interposed in the caulking portion, the elastic sealing material 8 is crushed by caulking, so that the occurrence of a problem that the degree of application of axial force due to caulking is reduced is also avoided.
[0032]
FIG. 3 is a cross-sectional view showing a hub unit according to Embodiment 2 as a reference embodiment of the present invention. The hub unit according to the second embodiment is a type used on the driven wheel side of an automobile, and includes a hub wheel 1 and a double-row rolling bearing 2. Unlike the first embodiment, the constant velocity joint 3 Is not used. However, the essence of the invention is basically the same as that of the first embodiment.
[0033]
The hub wheel 1 and the double-row rolling bearing 2 have basically the same configuration as that described in the first embodiment, but are slightly different in detail. Here, the hub wheel 1 has a solid structure, and has a structure in which a raceway surface serving as one inner ring of the double row rolling bearing 2 is formed on the outer peripheral surface of the shaft portion. Is provided with a single inner ring 25.
[0034]
Then, the inner end portion of the shaft portion of the hub wheel 1 is bent and deformed outward in the radial direction and caulked against the end surface of the inner ring 25 of the double row rolling bearing 2, thereby double row rolling with respect to the hub wheel 1. The bearing 2 is integrated. Note that reference numeral 15 denotes a caulking portion of the hub wheel 1.
[0035]
In such a configuration, the elastic sealing material 8 is held in a compressed state at a contact portion between the inner ring 25 and the caulking portion 15.
[0036]
The caulking form in the second embodiment will be described. Here, as shown in FIG. 4, the entire vehicle hub unit temporarily assembled on the base 42 is placed. In such a state, after attaching the elastic sealing material 8 to the outer peripheral surface of the inner end portion of the shaft portion of the hub wheel 1, the required angle θ with respect to the center O is set while pressing the caulking jig 43 with the required pressure. Add and roll. As a result, the inner end portion of the shaft portion of the hub wheel 1 is bent and deformed outward in the radial direction, and is caulked against the end surface of the inner ring 25 of the double row rolling bearing 2, and the caulking formed by this bending deformation. The elastic sealing material 8 is sandwiched between the portion 15 and the end face of the inner ring 25 in a state of being compressed and deformed.
[0037]
In this rolling caulking process, the caulking load acts on the hub wheel 1 from the inner ring 25, but since the hub wheel 1 is solid, the caulking load acts on the entire hub wheel 1, so that the flange 11 of the hub wheel 1 is caulked. There is no need for couples in time.
[0038]
As described above, in the first embodiment, the elastic seal material 8 is interposed between the inner ring 25 of the double row rolling bearing 2 and the contact portion between the caulking portion 15 of the shaft portion of the hub wheel 1 to be caulked there. Therefore, even if moisture is applied thereto, the moisture can be reliably prevented from entering the fitting portion between the inner ring 25 and the shaft portion of the hub wheel 1 from the caulking portion 38, and rust. It will be possible to avoid quality degradation due to. This inevitably prevents moisture from entering the inside of the double row rolling bearing 2, thereby contributing to an improvement in bearing life. In addition, even if the elastic sealing material 8 is interposed in the caulking portion, the elastic sealing material 8 is crushed by caulking, so that the occurrence of a problem that the degree of application of axial force due to caulking is reduced is also avoided.
[0039]
Various configurations of the hub unit of the present invention can be considered in addition to those exemplified in the first and second embodiments, but the present invention can be similarly applied to all of them. Moreover, in each said embodiment, although the O-ring was mentioned as an example as the elastic sealing material 8, it can be set as a solid sealing body or a liquid curable sealing body.
[0040]
【The invention's effect】
In the present invention, since the elastic sealing material is interposed in the caulking portion, it is possible to reliably prevent moisture from entering from here, and it is possible to avoid quality deterioration such as rust. Along with this, moisture intrusion into the inside of the double row rolling bearing can be avoided from the gap connected to the caulking portion. Furthermore, even if the elastic sealing material is interposed in the caulking portion, the elastic sealing material is crushed by caulking, so that the occurrence of a problem that the degree of application of axial force due to caulking is reduced is also avoided.
[0042]
Further, in the vehicle hub unit according to the first and second aspects of the present invention, it is possible to reliably prevent moisture from entering from the caulking portion into the fitting portion between the hub wheel and the shaft portion of the outer ring of the constant velocity joint. become.
[0043]
Thus, according to the present invention, the quality of each part of the vehicle hub unit can be maintained over a long period of time, which can contribute to improvement in reliability.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a hub unit according to Embodiment 1 of the present invention. FIG. 2 is an explanatory view showing a caulking form in the hub unit of FIG. 1. FIG. 3 shows a hub unit according to Embodiment 2 of the present invention. Sectional view showing FIG. 4 is a sectional view showing a caulking configuration in the hub unit of FIG.
DESCRIPTION OF SYMBOLS 1 Hub wheel 2 Double row rolling bearing 3 Constant velocity joint 4 Disc rotor 8 Elastic seal material 11 Hub wheel flange 31 Constant velocity joint outer ring 36 Cylindrical shaft portion 38 of outer ring Caulking portion of cylindrical shaft portion

Claims (2)

ハブホイールの外周に複列転がり軸受が、また、ハブホイールの内周に等速ジョイントがそれぞれ配設され、かつ、ハブホイールの外周面に径方向外向きのフランジが一体形成された車両用ハブユニットであって、
前記複列転がり軸受が、ハブホイールの内周に嵌合される等速ジョイントの外輪における軸部の外端部を径方向外向きに屈曲変形させてハブホイールの軸方向一端側の端面に対してかしめつけることにより軸方向に抜け止めされているとともに、
前記等速ジョイントの外輪において屈曲変形されたかしめ部とそれがかしめつけられるハブホイールの軸方向一端側の端面との間のみに、弾性シール材が圧縮変形させられた状態で挟持されている、ことを特徴とする車両用ハブユニット。A vehicle hub in which a double-row rolling bearing is disposed on the outer periphery of the hub wheel, a constant velocity joint is disposed on the inner periphery of the hub wheel, and a radially outward flange is integrally formed on the outer peripheral surface of the hub wheel. A unit,
The double row rolling bearing is formed by bending and deforming the outer end of the shaft portion of the outer ring of the constant velocity joint fitted to the inner periphery of the hub wheel radially outwardly with respect to the end surface on one end side in the axial direction of the hub wheel. It is prevented from coming off in the axial direction by caulking,
The elastic seal material is sandwiched between the crimped portion bent and deformed in the outer ring of the constant velocity joint and the end surface on one end side in the axial direction of the hub wheel to which it is crimped in a state of being compressed and deformed. A vehicle hub unit characterized by that. 請求項１の車両用ハブユニットにおいて、
前記等速ジョイントの外輪が、内周面に傾動案内要素を収納する椀形部と、この椀形部の小径部分に連接される円筒軸部とを有し、この円筒軸部の外周と前記ハブホイールの内周とがスプライン嵌合されており、
前記複列転がり軸受が、二列の軌道溝を有する単一の外輪と、二列で配設される複数の転動体とを有し、前記ハブホイールの外周面の所要領域が前記片方列の転動体群の軌道面とされるとともに、前記等速ジョイントの外輪の外周面における所要領域を前記他方列の転動体群の軌道面とされるものである、ことを特徴とする車両用ハブユニット。The vehicle hub unit according to claim 1 , wherein
The outer ring of the constant velocity joint has a bowl-shaped portion that houses the tilt guide element on the inner circumferential surface, and a cylindrical shaft portion that is connected to a small-diameter portion of the bowl-shaped portion. The inner circumference of the hub wheel is splined,
The double row rolling bearing has a single outer ring having two rows of raceway grooves and a plurality of rolling elements arranged in two rows, and a required area of the outer peripheral surface of the hub wheel is the one row. A hub unit for a vehicle, characterized in that it is used as a raceway surface of a rolling element group, and a required area on an outer peripheral surface of an outer ring of the constant velocity joint is used as a raceway surface of the other rolling element group. .
JP2000158184A 2000-05-29 2000-05-29 Hub unit for vehicles Expired - Fee Related JP4000751B2 (en)

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ITTO20010350A1 (en) * 2001-04-11 2001-07-11 Skf Ind Spa STATIC SEALING ELEMENT FOR BEARINGS.
JP3958568B2 (en) * 2001-12-13 2007-08-15 Ｎｔｎ株式会社 Drive wheel bearing device
JP2003191709A (en) * 2001-12-28 2003-07-09 Koyo Seiko Co Ltd Rolling bearing
US7461904B2 (en) 2005-06-17 2008-12-09 Shimano Inc. Bicycle hub sealing structure
JP5570687B2 (en) 2007-06-01 2014-08-13 Ｎｔｎ株式会社 Wheel bearing device
JP2009241614A (en) * 2008-03-28 2009-10-22 Jtekt Corp Wheel bearing device

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