JP4682459B2 - Manufacturing method of wheel bearing rolling bearing unit - Google Patents

Manufacturing method of wheel bearing rolling bearing unit Download PDF

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JP4682459B2
JP4682459B2 JP2001187531A JP2001187531A JP4682459B2 JP 4682459 B2 JP4682459 B2 JP 4682459B2 JP 2001187531 A JP2001187531 A JP 2001187531A JP 2001187531 A JP2001187531 A JP 2001187531A JP 4682459 B2 JP4682459 B2 JP 4682459B2
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inner ring
hub
caulking
outer diameter
support step
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JP2003004058A (en
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博昭 佐々
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NSK Ltd
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NSK Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/583—Details of specific parts of races
    • F16C33/586—Details of specific parts of races outside the space between the races, e.g. end faces or bore of inner ring
    • 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
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
    • 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

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

Description

【０００１】
【発明の属する技術分野】
この発明は、自動車の車輪を懸架装置に対して回転自在に支持する為に利用する、車輪支持用転がり軸受ユニットの製造方法の改良に関する。
【０００２】
【従来の技術】
自動車の車輪は、車輪支持用転がり軸受ユニットにより懸架装置に支持する。図４は、従来から広く実施されている車輪支持用転がり軸受ユニットの第１例を示している。この車輪支持用転がり軸受ユニット１は、ハブ２と、内輪３と、外輪４と、複数個の転動体５、５とを備える。このうちのハブ２の外周面の外端部（軸方向に関して外とは、自動車への組み付け状態で幅方向外寄りとなる側を言い、図８を除く各図の左側となる。反対に幅方向中央寄りとなる側を内と言い、図８を除く各図の右側となる。）には、車輪を支持する為の第一のフランジ６を形成している。又、このハブ２の中間部外周面には第一の内輪軌道７を、同じく内端部には外径寸法が小さくなった支持段部８を、それぞれ形成している。
【０００３】
上記支持段部８には、外周面に第二の内輪軌道９を形成した、上記内輪３を外嵌している。又、上記ハブ２の内端部には雄ねじ部１０を形成し、この雄ねじ部１０の先端部（図４の右端部）を、上記内輪３の内端面よりも内方に突出させている。そして、この雄ねじ部１０に螺合したナット１１と上記支持段部８の段差面１２との間で上記内輪３を挟持する事により、この内輪３を上記ハブ２の所定位置に結合固定している。尚、上記雄ねじ部１０の先端部外周面には、係止凹部１３を形成している。そして、上記ナット１１を所定のトルクで緊締した後、このナット１１の一部で上記係止凹部１３に整合する部分を直径方向内方にかしめ付ける事により、このナット１１の緩み止めを図っている。
【０００４】
又、上記外輪４の内周面には、上記第一の内輪軌道７と対向する第一の外輪軌道１４、及び、上記第二の内輪軌道９に対向する第二の外輪軌道１５を形成している。そして、これら第一、第二の内輪軌道７、９と第一、第二の外輪軌道１４、１５との間に上記各転動体５、５を、それぞれ複数個ずつ設けている。尚、図示の例では、これら各転動体５、５として玉を使用しているが、重量の嵩む自動車用の転がり軸受ユニットの場合には、これら転動体としてテーパころを使用する場合もある。
【０００５】
上述の様な車輪支持用転がり軸受ユニット１を自動車に組み付けるには、上記外輪４の外周面に形成した第二のフランジ１６により、この外輪４を懸架装置に固定し、上記第一のフランジ６に車輪を固定する。この結果、この車輪を懸架装置に対し回転自在に支持する事ができる。
【０００６】
又、特開平１１−１２９７０３号公報には、図５〜７に示す様な車輪支持用転がり軸受ユニット１ａが記載されている。この従来構造の第２例の車輪支持用転がり軸受ユニット１ａは、ハブ２ａと、内輪３と、外輪４と、複数個の転動体５、５とを備える。このうちのハブ２ａの外周面の外端寄り部分には、車輪を支持する為の第一のフランジ６を形成している。又、このハブ２ａの中間部外周面には第一の内輪軌道７を、同じく内端部には外径寸法が小さくなった支持段部８を、それぞれ形成している。
【０００７】
又、上記ハブ２ａの内端部には、上記内輪３を固定する為のかしめ部１７を構成する為の円筒部１８を形成している。この円筒部１８の肉厚は、図７に示した、この円筒部１８を直径方向外方にかしめ広げる以前の状態で、先端縁（図７の右端縁）に向かう程小さくなっている。この為上記ハブ２ａの内端面に、奥部に向かう程次第に内径が小さくなるテーパ孔１９を形成している。
【０００８】
上記ハブ２ａの内端部に上記内輪３を固定すべく、上述の様な円筒部１８の先端部をかしめ広げるには、上記ハブ２ａが軸方向にずれ動かない様に固定した状態で、図６に示す様に、押型２０を上記円筒部１８の先端部に強く押し付ける。この押型２０の先端面（図６の左端面）中央部には、上記円筒部１８の内側に押し込み自在な円錐台状の凸部２１を形成し、この凸部２１の周囲に断面円弧状の凹部２２を、この凸部２１の全周を囲む状態で形成している。尚、この凹部２２の断面形状は、この凹部２２により上記円筒部１８の先端部を塑性変形させる事で得られるかしめ部１７の断面形状が、基端部から先端部に向かう程厚さ寸法が漸次小さくなる様に、特にこの厚さ寸法が先端部で急激に小さくなる様に、外径側に向かう程曲率半径が小さくなる複合曲面としている。
【０００９】
上述の様な形状並びに寸法の凸部２１と凹部２２とを有する押型２０を上記円筒部１８の先端部に押し付ければ、この円筒部１８の先端部を直径方向外方にかしめ広げて、上記かしめ部１７を形成する事ができる。そして、このかしめ部１７とハブ２ａの内端部に形成した支持段部８の段差面１２との間で上記内輪３を挟持して、この内輪３を上記ハブ２ａに固定できる。
【００１０】
尚、上記円筒部１８を塑性変形させて（かしめ広げて）上記かしめ部１７を形成する作業を行なうのに好ましくは、図８に示す様な揺動プレス装置２３を使用する。この揺動プレス装置２３は、押型２０と、抑え治具２４と、ホルダ２５とを備える。上記円筒部１８をかしめ広げて上記かしめ部１７を形成する際には、上記ホルダ２５を介して上記ハブ２ａを上方に押圧しつつ、上記押型２０を揺動させる。即ち、この押型２０の中心軸と上記ハブ２ａの中心軸とを角度θだけ傾斜させた状態で、この押型２０に、このハブ２ａの中心軸を中心とする歳差運動の如き揺動運動をさせる。この様な揺動プレスにより上記かしめ部１７を形成する際には、上記押型２０の円周方向の一部が上記円筒部１８を押圧する事になり、上記かしめ部１７の加工作業は部分的に且つ円周方向に連続して進行する事になる。この為、一般的な鍛造加工により上記かしめ部１７を形成する場合に比べて、加工時に上記円筒部１８に加える荷重を小さくできる。尚、上記抑え治具２４は、上記押型２０によるかしめ部１７の加工時に上記ハブ２ａ及び内輪３が径方向に振れる事を防止する。
【００１１】
【発明が解決しようとする課題】
ところで、上述の様な揺動かしめにより円筒部１８をかしめ広げてかしめ部１７を形成する場合、押型２０の形状や揺動角度、押し付け荷重等の各種条件にもよるが、このかしめ広げ作業に伴って内輪３を外嵌する支持段部８に、外径が拡大する方向の力が加わる可能性がある。この結果、上記円筒部１８にかしめ部１７を形成した状態で、上記支持段部８の外径が拡大し、この支持段部８に外嵌した内輪３に過大な引っ張り応力が加わる可能性がある。そして、この様に内輪３に過大な引っ張り応力が加わると、この内輪３の外周面に形成した第二の内輪軌道９が径方向に歪む他、著しい場合にはこの内輪３に亀裂等の損傷が発生し、車輪支持用転がり軸受ユニットとして機能しなくなる可能性がある。
【００１２】
この様な支持段部８の外径が拡大する事により、上記内輪３に過大な引っ張り応力が加わる事を防止すべく、図９に示す様な構造が考えられる。即ち、内輪３を外嵌する支持段部８の外径に比べて、かしめ部１７（図８参照）となる円筒部１８の外径を小さくする事により、これら支持段部８と円筒部１８との間部分に段差部２６を設ける。より具体的には、この円筒部１８の基端部外周面で、上記内輪３の内端開口部に形成した、断面形状が四分の一円弧状の曲面部２７よりも少しだけ第二の内輪軌道９に寄った部分に、段差Ｈを有する断面円弧状の段差部２６を形成する。この様に段差部２６を設けた場合には、上記円筒部１８を直径方向外方にかしめ広げる際に、この段差部２６がかしめ広げ作業に伴って折れ曲がる部分の起点となる。この為、かしめ広げ作業に伴って上記円筒部１８に無理な力が加わりにくくなり、上記支持段部８の外径を拡大しにくくできる。
【００１３】
ところが、この様に段差部２６を設けた場合でも、内輪３に引っ張り応力が加わる事を阻止できない可能性がある。即ち、上記段差部２６を設ける事によりこの段差部２６を起点にかしめ部１７が形成されても、上記支持段部８の内端部で上記段差部２６近傍の外径は、上記円筒部１８がかしめ広げられるにつられて拡大する可能性がある。そして、この様に円筒部１８につられて支持段部８の内端部が拡大すると、やはり上述した様に内輪３に過大な引っ張り応力が加わり、著しい場合には上記第二の内輪軌道９が歪んだり、上記内輪３に亀裂等の損傷が発生したりする可能性がある。
本発明の車輪支持用転がり軸受ユニットの製造方法は、この様な事情に鑑みて発明したものである。
【００１４】
【課題を解決するための手段】
本発明の製造方法の対象となる車輪支持用転がり軸受ユニットは、前述した従来の車輪支持用転がり軸受ユニットと同様に、一端部外周面に第一のフランジを形成し、中間部外周面に第一の内輪軌道を直接又は別体の内輪を介して設けたハブと、このハブの他端部に形成した支持段部に外嵌され、外周面に第二の内輪軌道を形成した内輪と、内周面に上記第一の内輪軌道に対向する第一の外輪軌道及び上記第二の内輪軌道に対向する第二の外輪軌道を形成した外輪と、上記第一、第二の内輪軌道と上記第一、第二の外輪軌道との間に、それぞれ複数個ずつ設けられた転動体とを備える。そして、上記支持段部の他端部で少なくともこの支持段部に外嵌した内輪よりも突出した部分に形成した円筒部を直径方向外方にかしめ広げる事で形成したかしめ部により、上記ハブに外嵌した内輪をこのハブに結合固定している。
【００１５】
特に、本発明の車輪支持用転がり軸受ユニットの製造方法に於いては、上記ハブとして、上記支持段部の一部でかしめ広げ作業に伴って折れ曲がる部分の起点となる部分であり、この支持段部の一端寄り部分の外径よりも他端寄り部分の外径を小さくした段差部よりも、更に一端に寄った、上記支持段部の一端寄り部分のうちの他端側の外径を、この一端寄り部分の一端側の外径に比べて小さくなったものを使用する。そして、上記内輪を上記支持段部に、上記各転動体に予圧を付与しつつ、この内輪の一端面を上記支持段部の段差面に突き当てるまで締り嵌めで外嵌する。更に、この締り嵌めに基づいて上記内輪に加わる静止摩擦力を、上記各転動体に付与された予圧に基づいてこの内輪に加わる軸方向荷重よりも大きくした状態から、上記円筒部を直径方向外方にかしめ広げる事で上記かしめ部を形成する。
上記支持段部の一部でかしめ広げ作業に伴って折れ曲がる部分の起点となる部分であり、この支持段部の一端寄り部分の外径よりも他端寄り部分の外径を小さくした段差部よりも一端に寄った、上記支持段部の一端寄り部分のうちの他端側の外径を、この一端寄り部分の一端側の外径に比べて小さくする為に、例えばこの一端寄り部分の外周面を、軸方向他端側に向かう程外径が小さくなるテーパ状とする。又は、この一端寄り部分の外周面のうちの他半部の外径を一半部の外径に比べて小さくしたり、或は、この一端寄り部分の外周面のうちの他半部を軸方向他端側に向かう程外径が小さくなるテーパ状としたりする。
【００１６】
【作用】
上述の様に構成する本発明の車輪支持用転がり軸受ユニットの製造方法によれば、円筒部をかしめ広げる事によりかしめ部を形成した状態で、支持段部に外嵌した内輪に過大な応力が加わる事を防止できる。即ち、この支持段部の一部でかしめ広げ作業に伴って折れ曲がる部分の起点となる部分であり、この支持段部の一端寄り部分の外径よりも他端寄り部分の外径を小さくした段差部よりも一端に寄った、上記支持段部の一端寄り部分のうちの他端側の外径を、同じくこの一端寄り部分の一端側の外径に比べて小さくしている為、押型の形状等の各種条件により、かしめ広げ作業に伴って上記支持段部の他端部で上記起点となる部分近傍の外径が拡大したとしても、上記内輪に過大な引っ張り応力が加わる程この支持段部の外径が拡大する事を防止できる。この為、上記内輪の外周面に形成した第二の内輪軌道が径方向に歪んだり、この内輪に亀裂等の損傷が発生したりする事を防止できる。
【００１７】
しかも、本発明の製造方法の場合には、上記内輪は、上記かしめ部を形成する以前に上記支持段部に外嵌し、各転動体に予圧を付与した状態のまま、この予圧に基づく軸方向荷重に拘らず、上記内輪の一端面と上記支持段部の段差面とが当接した状態のままとなる。従って、上記かしめ部の形成作業に伴って上記内輪に、この内輪及びハブの中心軸に対し傾斜方向の力が加わっても、この内輪の一端開口周縁部が上記支持段部の外周面と強く擦れ合ったり、この内輪の中心軸が上記ハブの中心軸に対し傾斜する事を防止できる。
【００１８】
【発明の実施の形態】
図１は、請求項１に対応する、本発明の実施の形態の第１例を示している。尚、本発明の車輪支持用転がり軸受ユニットの製造方法の特徴は、ハブ２ｂの内端部外周面に形成した支持段部８ａに内輪３（図５〜９参照）を外嵌固定する部分の形状を工夫した点にある。ハブ２ｂの内端部に設けた円筒部１８を径方向外方にかしめ広げてかしめ部１７（図５、６、８参照）とし、上記ハブ２ｂと内輪３（図５〜９参照）とを結合固定する点、並びに、得られた車輪支持用転がり軸受ユニット１ａ全体の構造及び作用は、前述の図５に示した従来構造の第２例や、同じく図９に示した本発明の参考となる構造と同様であるから、同等部分に関する図示並びに説明は、省略若しくは簡略にし、以下、本発明の特徴部分を中心に説明する。
【００１９】
本例の製造方法により造る車輪支持用転がり軸受ユニット１ａの場合、ハブ２ｂの内端部に形成した支持段部８ａの一部で、かしめ広げ作業に伴って折れ曲がる部分の起点となる部分である段差部２６よりも外端に寄った部分のうちの内端側の外径ｄ1 を、同じくこの外端側部分のうちの外端側の外径ｄ2 に比べて小さくしている（ｄ1 ＜ｄ2 ）。即ち、上記支持段部８ａの一部で上記段差部２６よりも外端に寄った部分の外周面を、軸方向内端側に向かう程外径が小さくなる方向に僅か（図１は傾斜角度を誇張して描いている。）に傾斜したテーパ状とし、この外端に寄った部分をテーパ面部２８としている。尚、好ましくは、この様に支持段部８ａの一部をテーパ状とした場合でも、この支持段部８ａの内端部に形成した円筒部１８をかしめ広げてかしめ部１７（図８参照）を形成する前の状態で、上記内輪３の少なくとも外端部内周面を上記支持段部８ａの外周面に締り嵌めにより外嵌自在とする。そして、この内輪３の外端面を上記支持段部８ａの段差面１２に突き当てた状態で、各転動体５、５（図５〜９参照）に所望の予圧を付与する。
【００２０】
即ち、上記締り嵌めに基づいて上記内輪３に加わる静止摩擦力を、上記各転動体５、５に付与された予圧に基づいてこの内輪３に加わる軸方向荷重よりも大きくする。この様に支持段部８ａと内輪３との嵌め合いを規制すれば、上述の様にこの内輪３の外端面を上記段差面１２に突き当てて上記各転動体５、５に所望の予圧を付与した状態で、上記円筒部１８をかしめ広げる以前でも、上記内輪３をそのまま（内輪３の外端面を段差面１２に突き当てたまま）の位置に保持できる。言い換えれば、前述の図８に示す様な揺動かしめにより上記かしめ部１７を形成する際に、上記ハブ２ｂに対して上記内輪３が変位する事がなくなる。
【００２１】
上述の様に上記内輪３を上記ハブ２ｂの支持段部８ａに締り嵌めで外嵌すると共に、上記各転動体５、５に予圧を付与したならば、前述した従来技術の場合と同様、揺動かしめにより上記円筒部１８を直径方向外方にかしめ広げる事で、上記かしめ部１７を形成する。特に本例の製造方法により造る車輪用転がり軸受ユニットの場合には、この様に円筒部１８をかしめ広げる事によりかしめ部１７を形成した状態で、上記支持段部８ａに外嵌した内輪３に過大な応力が加わる事を防止できる。即ち、この支持段部８ａの一部で上記段差部２６よりも外端に寄った部分のうちの内端側の外径ｄ1 を、同じくこの外端に寄った部分のうちの外端側の外径ｄ2 に比べて小さく（ｄ1 ＜ｄ2 ）している為、かしめ広げ作業に伴って上記支持段部８ａの内端部で上記段差部２６近傍の外径が拡大したとしても、上記内輪３に過大な引っ張り応力が加わる程この支持段部８ａの外径が拡大する事を防止できる。この為、上記内輪３の外周面に形成した第二の内輪軌道９が径方向に歪んだり、この内輪３に亀裂等の損傷が発生したりする事を防止できる。
【００２２】
しかも、本発明の製造方法の場合には、上記内輪３は、上記かしめ部１７を形成する以前に上記ハブ２ｂの支持段部８ａに外嵌し、上記各転動体５、５に予圧を付与した状態のまま、この予圧に基づく軸方向荷重に拘らず、上記内輪３の外端面と上記ハブ２ｂの外周面に形成した段差面１２とが当接した状態のままとなる。従って、上記かしめ部１７の形成作業に伴って上記内輪３に、この内輪３及び上記ハブ２ｂの中心軸に対し傾斜方向の力が加わっても、この内輪３の外端開口周縁部が上記支持段部８ａの外周面と強く擦れ合ったり、この内輪３の中心軸が上記ハブ２ｂの中心軸に対し傾斜する事を防止できる。尚、本例の場合、第一の内輪軌道７（図示省略）を上記ハブ２ｂの外周面に直接形成しているが、外周面に第一の内輪軌道を形成した別体の内輪を外嵌しても良い。
【００２３】
次に、図２は、請求項１、２に対応する、本発明の実施の形態の第２例を示している。本例の製造方法により造る車輪支持用転がり軸受ユニット１ａの場合も、ハブ２ｂの内端部に形成した支持段部８ｂの一部で、かしめ広げ作業に伴って折れ曲がる部分の起点となる部分である段差部２６よりも外端に寄った部分のうちの内端側の外径ｄ1 を、同じくこの外端に寄った部分のうちの外端側の外径ｄ2 に比べて小さくしている（ｄ1 ＜ｄ2 ）。この為に、本例の場合は、この支持段部８ｂの一部で上記段差部２６よりも外端に寄った部分の外周面のうちの内半部の外径ｄ1 を、同じく外半部の外径ｄ2 に比べて僅かに（図２は両外径ｄ1 、ｄ2 の差を誇張して描いている。）小さくする事により、この支持段部８ｂを大径部２９と小径部３０とにより構成している。又、本例の場合も、上記支持段部８ｂの内端部に形成した円筒部１８をかしめ広げてかしめ部１７（図８参照）を形成する前の状態で、内輪３（図５〜９参照）を上記支持段部８ｂのうちの少なくとも上記大径部２９に締り嵌めにより外嵌自在としている。その他の構成及び作用は、上述した第１例と同様であるから、重複する説明は省略する。
【００２４】
次に、図３は、請求項１に対応する、本発明の実施の形態の第３例を示している。本例の製造方法により造る車輪支持用転がり軸受ユニット１ａの場合も、ハブ２ｂの内端部に形成した支持段部８ｃの一部で、かしめ広げ作業に伴って折れ曲がる部分の起点となる部分である段差部２６よりも外端に寄った部分のうちの内端側の外径ｄ1 を、同じくこの外端に寄った部分のうちの外端側の外径ｄ2 に比べて小さくしている（ｄ1 ＜ｄ2 ）。この為、本例の場合は、この支持段部８ｃの一部で上記段差部２６よりも外端に寄った部分の外周面のうちの内半部の外周面を、軸方向内端側に向かう程外径が小さくなる方向に僅かに傾斜した（図３は、傾斜角度を誇張して描いている。）テーパ面部２８ａとしている。又、本例の場合も、上記支持段部８ｃの内端部に形成した円筒部１８をかしめ広げてかしめ部１７（図８参照）を形成する前の状態で、内輪３（図５〜９参照）を上記支持段部８ｃのうちの少なくとも外半部に締り嵌めにより外嵌自在としている。その他の構成及び作用は、前述した第１例と同様であるから、重複する説明は省略する。
【００２５】
【発明の効果】
本発明の車輪支持用転がり軸受ユニットの製造方法は、以上に述べた通り構成され作用するので、小型且つ軽量な車輪支持用転がり軸受ユニットを安定して得る事ができる。
【図面の簡単な説明】
【図１】 本発明の実施の形態の第１例を、かしめ部を形成する以前の状態で示す部分断面図。
【図２】 同第２例を示す図１と同様の図。
【図３】 同第３例を示す図１と同様の図。
【図４】 従来構造の第１例を示す半部断面図。
【図５】 同第２例を示す半部断面図。
【図６】 第２例の構造の製造時にハブに内輪を固定する為、このハブの内端部をかしめ広げる状態を示す部分拡大断面図。
【図７】 同じくハブの内端部をかしめ広げる以前の状態で示す部分拡大断面図。
【図８】 揺動プレス装置の要部縦断面図。
【図９】 本発明の参考となる構造の１例を示す、図７と同様の図。
【符号の説明】
１、１ａ 車輪支持用転がり軸受ユニット
２、２ａ、２ｂ ハブ
３ 内輪
４ 外輪
５ 転動体
６ 第一のフランジ
７ 第一の内輪軌道
８、８ａ、８ｂ、８ｃ 支持段部
９ 第二の内輪軌道
１０ 雄ねじ部
１１ ナット
１２ 段差面
１３ 係止凹部
１４ 第一の外輪軌道
１５ 第二の外輪軌道
１６ 第二のフランジ
１７ かしめ部
１８ 円筒部
１９ テーパ孔
２０ 押型
２１ 凸部
２２ 凹部
２３ 揺動プレス装置
２４ 抑え治具
２５ ホルダ
２６ 段差部
２７ 曲面部
２８、２８ａ テーパ面部
２９ 大径部
３０ 小径部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a method for manufacturing a wheel bearing rolling bearing unit that is used for rotatably supporting a wheel of an automobile with respect to a suspension device.
[0002]
[Prior art]
The wheels of the automobile are supported on the suspension device by a rolling bearing unit for supporting the wheels. FIG. 4 shows a first example of a wheel support rolling bearing unit that has been widely used in the past. The wheel support rolling bearing unit 1 includes a hub 2, an inner ring 3, an outer ring 4, and a plurality of rolling elements 5 and 5. Of these, the outer end of the outer peripheral surface of the hub 2 (outside with respect to the axial direction refers to the side that is outward in the width direction in the assembled state in the automobile, and is the left side of each figure excluding FIG. 8. The first flange 6 for supporting the wheel is formed on the side closer to the center in the direction is called “inside” and is the right side of each figure except FIG. A first inner ring raceway 7 is formed on the outer peripheral surface of the intermediate portion of the hub 2, and a support step portion 8 having a smaller outer diameter is formed on the inner end portion.
[0003]
The inner ring 3 having a second inner ring raceway 9 formed on the outer peripheral surface is externally fitted to the support step 8. Further, a male screw portion 10 is formed at the inner end portion of the hub 2, and the tip end portion (the right end portion in FIG. 4) of the male screw portion 10 protrudes inward from the inner end surface of the inner ring 3. Then, the inner ring 3 is clamped and fixed to a predetermined position of the hub 2 by sandwiching the inner ring 3 between the nut 11 screwed into the male screw part 10 and the step surface 12 of the support step part 8. Yes. A locking recess 13 is formed on the outer peripheral surface of the distal end portion of the male screw portion 10. Then, after tightening the nut 11 with a predetermined torque, a portion of the nut 11 that is aligned with the locking recess 13 is caulked inward in the diametrical direction, thereby preventing the nut 11 from loosening. Yes.
[0004]
A first outer ring raceway 14 that faces the first inner ring raceway 7 and a second outer ring raceway 15 that faces the second inner ring raceway 9 are formed on the inner peripheral surface of the outer ring 4. ing. A plurality of the rolling elements 5 and 5 are provided between the first and second inner ring raceways 7 and 9 and the first and second outer ring raceways 14 and 15, respectively. In the example shown in the figure, balls are used as the rolling elements 5 and 5. However, in the case of a rolling bearing unit for automobiles that is heavy in weight, tapered rollers may be used as the rolling elements.
[0005]
In order to assemble the wheel support rolling bearing unit 1 as described above to the automobile, the outer ring 4 is fixed to the suspension device by the second flange 16 formed on the outer peripheral surface of the outer ring 4, and the first flange 6 Secure the wheels to the As a result, this wheel can be rotatably supported with respect to the suspension device.
[0006]
Japanese Patent Application Laid-Open No. 11-129703 discloses a wheel bearing rolling bearing unit 1a as shown in FIGS. The wheel support rolling bearing unit 1a of the second example of the conventional structure includes a hub 2a, an inner ring 3, an outer ring 4, and a plurality of rolling elements 5, 5. Of these, a first flange 6 for supporting the wheel is formed in a portion near the outer end of the outer peripheral surface of the hub 2a. A first inner ring raceway 7 is formed on the outer peripheral surface of the intermediate portion of the hub 2a, and a support step portion 8 having a smaller outer diameter is formed on the inner end portion.
[0007]
A cylindrical portion 18 for forming a caulking portion 17 for fixing the inner ring 3 is formed at the inner end portion of the hub 2a. The thickness of the cylindrical portion 18 becomes smaller toward the tip edge (the right edge in FIG. 7) in the state before the cylindrical portion 18 is caulked outward in the diametrical direction as shown in FIG. For this reason, a tapered hole 19 is formed in the inner end surface of the hub 2a, the inner diameter of which gradually decreases toward the inner part.
[0008]
In order to squeeze the tip of the cylindrical portion 18 as described above in order to fix the inner ring 3 to the inner end of the hub 2a, the hub 2a is fixed so that it does not move in the axial direction. As shown in FIG. 6, the pressing die 20 is strongly pressed against the tip of the cylindrical portion 18. A frustoconical convex portion 21 that can be pushed into the inside of the cylindrical portion 18 is formed at the central portion of the tip surface (left end surface in FIG. 6) of the pressing die 20, and a circular arc section is formed around the convex portion 21. The concave portion 22 is formed so as to surround the entire circumference of the convex portion 21. The cross-sectional shape of the concave portion 22 is such that the cross-sectional shape of the caulking portion 17 obtained by plastically deforming the distal end portion of the cylindrical portion 18 by the concave portion 22 has a thickness dimension as it goes from the proximal end portion toward the distal end portion. The composite curved surface has a curvature radius that becomes smaller toward the outer diameter side, so that the thickness dimension is abruptly reduced especially at the tip portion so as to gradually become smaller.
[0009]
If the pressing die 20 having the convex portion 21 and the concave portion 22 having the shape and dimensions as described above is pressed against the tip portion of the cylindrical portion 18, the tip portion of the cylindrical portion 18 is caulked outward in the diametrical direction, The caulking portion 17 can be formed. The inner ring 3 can be clamped between the caulking portion 17 and the step surface 12 of the support step portion 8 formed at the inner end of the hub 2a, and the inner ring 3 can be fixed to the hub 2a.
[0010]
In order to perform the operation of forming the caulking portion 17 by plastically deforming (caulking and expanding) the cylindrical portion 18, a swing press device 23 as shown in FIG. 8 is preferably used. The swing press device 23 includes a pressing die 20, a holding jig 24, and a holder 25. When the caulking portion 17 is formed by caulking the cylindrical portion 18, the pressing die 20 is swung while pressing the hub 2 a upward via the holder 25. That is, in a state where the central axis of the pressing die 20 and the central axis of the hub 2a are inclined by an angle θ, the pressing die 20 is subjected to a swinging motion such as precession about the central axis of the hub 2a. Let When the caulking portion 17 is formed by such a rocking press, a part of the pressing die 20 in the circumferential direction presses the cylindrical portion 18, and the caulking portion 17 is partially processed. And continuously in the circumferential direction. For this reason, compared with the case where the said caulking part 17 is formed by a general forging process, the load added to the said cylindrical part 18 at the time of a process can be made small. The holding jig 24 prevents the hub 2a and the inner ring 3 from swinging in the radial direction when the caulking portion 17 is processed by the pressing die 20.
[0011]
[Problems to be solved by the invention]
By the way, when the caulking part 17 is formed by caulking and caulking as described above to form the caulking part 17, depending on various conditions such as the shape of the die 20, the rocking angle, and the pressing load, Along with this, there is a possibility that a force in a direction in which the outer diameter increases is applied to the support step portion 8 that externally fits the inner ring 3. As a result, in the state where the caulking portion 17 is formed in the cylindrical portion 18, the outer diameter of the support step portion 8 is enlarged, and an excessive tensile stress may be applied to the inner ring 3 that is externally fitted to the support step portion 8. is there. If an excessive tensile stress is applied to the inner ring 3 in this manner, the second inner ring raceway 9 formed on the outer peripheral surface of the inner ring 3 is distorted in the radial direction. May occur and may not function as a wheel bearing rolling bearing unit.
[0012]
In order to prevent an excessive tensile stress from being applied to the inner ring 3 by increasing the outer diameter of the support step 8 as described above, a structure as shown in FIG. 9 can be considered. That is, by reducing the outer diameter of the cylindrical portion 18 that becomes the caulking portion 17 (see FIG. 8) as compared with the outer diameter of the supporting step portion 8 that externally fits the inner ring 3, the supporting step portion 8 and the cylindrical portion 18 are provided. A stepped portion 26 is provided between the two. More specifically, the outer peripheral surface of the base end portion of the cylindrical portion 18 is formed in the inner end opening of the inner ring 3 and has a second cross section that is slightly smaller than the curved surface portion 27 having a quarter arc shape. A stepped portion 26 having an arcuate cross section having a step H is formed at a portion close to the inner ring raceway 9. When the step portion 26 is provided in this way, when the cylindrical portion 18 is caulked and spread outward in the diameter direction, the step portion 26 becomes a starting point of a portion that is bent along with the caulking and spreading operation. For this reason, it becomes difficult to apply an excessive force to the cylindrical portion 18 along with the caulking and spreading operation, and it is difficult to increase the outer diameter of the support step portion 8.
[0013]
However, even when the step portion 26 is provided in this manner, it may not be possible to prevent the tensile stress from being applied to the inner ring 3. That is, even if the caulking portion 17 is formed starting from the stepped portion 26 by providing the stepped portion 26, the outer diameter in the vicinity of the stepped portion 26 at the inner end portion of the supporting stepped portion 8 is the cylindrical portion 18. There is a possibility that it will expand as it is crimped. When the inner end portion of the support step portion 8 is expanded by the cylindrical portion 18 as described above, an excessive tensile stress is applied to the inner ring 3 as described above. There is a possibility that the inner ring 3 is distorted or damaged such as a crack.
The manufacturing method of the rolling bearing unit for wheel support of this invention is invented in view of such a situation.
[0014]
[Means for Solving the Problems]
The wheel support rolling bearing unit that is the object of the manufacturing method of the present invention is the same as the above-described conventional wheel support rolling bearing unit, in which the first flange is formed on the outer peripheral surface of the one end and the second outer peripheral surface of the intermediate portion is formed. A hub in which one inner ring raceway is provided directly or via a separate inner ring, an inner ring that is externally fitted to a support step formed on the other end of the hub, and forms a second inner ring raceway on the outer peripheral surface; An outer ring having a first outer ring raceway facing the first inner ring raceway and a second outer ring raceway facing the second inner ring raceway on an inner peripheral surface; the first and second inner ring raceways; and A plurality of rolling elements are provided between the first and second outer ring raceways. Then, at the other end portion of the support step portion, at least the cylindrical portion formed at the portion protruding from the inner ring fitted on the support step portion is caulked and formed on the hub by the caulking portion formed radially outward. The inner ring that is fitted externally is connected and fixed to this hub.
[0015]
In particular, in the method of manufacturing a rolling bearing unit for supporting a wheel according to the present invention, the hub is a portion that becomes a starting point of a portion that is bent along with a caulking and spreading operation at a part of the support step portion. than the step portion where the outer diameter is reduced in the other end portion closer than the outer diameter of the end portion near parts, closer further to one end, the outer diameter of the other end of the near one end portion of the supporting stepped portion, The one that is smaller than the outer diameter on one end side of the portion closer to one end is used. Then, the inner ring is fitted on the support step portion by pre-loading the rolling elements, and the inner ring is externally fitted with an interference fit until the one end surface of the inner ring abuts on the step surface of the support step portion. Further, from the state in which the static friction force applied to the inner ring based on the interference fit is larger than the axial load applied to the inner ring based on the preload applied to the rolling elements, the cylindrical portion is removed from the diametrically outer side. The above-mentioned caulking part is formed by caulking and spreading.
It is the part that becomes the starting point of the part that bends with caulking and spreading work at a part of the support step part, and from the step part that the outer diameter of the part near the other end is smaller than the outer diameter of the part near the one end In order to make the outer diameter of the other end side of the support step portion near the one end smaller than the outer diameter of the one end side of the support step portion , for example, the outer circumference of the one end portion The surface is tapered so that the outer diameter decreases toward the other end in the axial direction. Or, or smaller than the outer diameter of one half the outer diameter of the other half portion of the outer peripheral surface of the end portion near or axial other half portion of the outer peripheral surface of the end portion near For example, the outer diameter decreases toward the other end.
[0016]
[Action]
According to the manufacturing method of the wheel support rolling bearing unit of the present invention configured as described above, excessive stress is applied to the inner ring that is externally fitted to the support step portion in a state where the caulking portion is formed by caulking and expanding the cylindrical portion. You can prevent you from joining. That is, it is a part that becomes a starting point of a part that bends along with caulking and spreading work at a part of this support step part, and a step that has an outer diameter near the other end smaller than an outer diameter near the one end of this support step part Since the outer diameter on the other end side of the portion near the one end of the support step portion that is closer to the one end than the portion is smaller than the outer diameter on the one end side of the portion near the one end, the shape of the pressing die Even if the outer diameter in the vicinity of the starting point is enlarged at the other end of the support step due to the caulking and spreading operation, the support step is increased as excessive tensile stress is applied to the inner ring. It is possible to prevent the outer diameter of the resin from expanding. For this reason, it is possible to prevent the second inner ring raceway formed on the outer peripheral surface of the inner ring from being distorted in the radial direction and from being damaged such as a crack in the inner ring.
[0017]
In addition, in the case of the manufacturing method of the present invention, the inner ring is fitted on the support step portion before the caulking portion is formed, and a shaft based on the preload is provided with the preload applied to each rolling element. Regardless of the directional load, the one end surface of the inner ring remains in contact with the step surface of the support step portion. Therefore, even if a force in an inclined direction is applied to the inner ring and the center axis of the hub in connection with the formation of the caulking portion, the peripheral edge of the inner opening of the inner ring is strongly stronger than the outer peripheral surface of the support step. It is possible to prevent rubbing and inclination of the center axis of the inner ring with respect to the center axis of the hub.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a first example of an embodiment of the present invention corresponding to claim 1 . The manufacturing method of the wheel support rolling bearing unit according to the present invention is characterized in that the inner ring 3 (see FIGS. 5 to 9) is externally fixed to the support step 8a formed on the outer peripheral surface of the inner end of the hub 2b. The shape is devised. The cylindrical portion 18 provided at the inner end portion of the hub 2b is caulked and spread radially outward to form a caulking portion 17 (see FIGS. 5, 6, and 8), and the hub 2b and the inner ring 3 (see FIGS. 5 to 9) are connected. The point of coupling and fixing, and the structure and operation of the obtained wheel support rolling bearing unit 1a as a whole are the second example of the conventional structure shown in FIG. 5 and the reference of the present invention shown in FIG. Since it is the same as the structure, the illustrations and explanations of the equivalent parts are omitted or simplified, and the characteristic parts of the present invention will be mainly described below.
[0019]
In the case of the wheel-supporting rolling bearing unit 1a manufactured by the manufacturing method of this example, it is a part of the support step portion 8a formed at the inner end portion of the hub 2b, which is the starting point of the portion that is bent along with the caulking and spreading operation. The outer diameter d 1 on the inner end side of the portion closer to the outer end than the stepped portion 26 is also made smaller than the outer diameter d 2 on the outer end side of the outer end side portion (d). 1 <d 2 ). That is, the outer peripheral surface of a portion of the support step portion 8a that is closer to the outer end than the step portion 26 is slightly smaller in the direction in which the outer diameter becomes smaller toward the inner end side in the axial direction (FIG. 1 shows an inclination angle). And a portion close to the outer end is a tapered surface portion 28. Preferably, even when a part of the support step portion 8a is tapered as described above, the cylindrical portion 18 formed at the inner end portion of the support step portion 8a is caulked and spread (see FIG. 8). In the state before forming the inner ring 3, at least the inner peripheral surface of the outer end portion of the inner ring 3 can be fitted onto the outer peripheral surface of the support step portion 8a by an interference fit. Then, a desired preload is applied to each of the rolling elements 5 and 5 (see FIGS. 5 to 9) in a state where the outer end surface of the inner ring 3 is abutted against the step surface 12 of the support step portion 8a.
[0020]
That is, the static frictional force applied to the inner ring 3 based on the interference fit is made larger than the axial load applied to the inner ring 3 based on the preload applied to the rolling elements 5 and 5. If the fitting between the support step 8a and the inner ring 3 is restricted in this way, the outer end surface of the inner ring 3 is abutted against the step surface 12 as described above, and a desired preload is applied to the rolling elements 5 and 5 as described above. In the applied state, even before the cylindrical portion 18 is caulked and spread, the inner ring 3 can be held in a position as it is (while the outer end surface of the inner ring 3 is abutted against the step surface 12). In other words, the inner ring 3 is not displaced with respect to the hub 2b when the caulking portion 17 is formed by the rocking caulking as shown in FIG.
[0021]
As described above, if the inner ring 3 is externally fitted to the support step 8a of the hub 2b by interference fitting and preload is applied to the rolling elements 5 and 5, as in the case of the prior art described above, The caulking portion 17 is formed by caulking and expanding the cylindrical portion 18 outward in the diameter direction by moving. In particular, in the case of a rolling bearing unit for a wheel manufactured by the manufacturing method of this example, the inner ring 3 that is externally fitted to the support step portion 8a is formed with the caulking portion 17 formed by caulking and expanding the cylindrical portion 18 in this manner. An excessive stress can be prevented from being applied. That is, the outer diameter d 1 on the inner end side of the portion of the support step portion 8a that is closer to the outer end than the step portion 26 is the outer end side of the portion that is also closer to the outer end. Since the outer diameter d 2 is smaller (d 1 <d 2 ) than the outer diameter d 2 , even if the outer diameter in the vicinity of the step portion 26 is enlarged at the inner end portion of the support step portion 8 a due to the caulking and spreading operation. As the excessive tensile stress is applied to the inner ring 3, the outer diameter of the support step 8a can be prevented from expanding. For this reason, it is possible to prevent the second inner ring raceway 9 formed on the outer peripheral surface of the inner ring 3 from being distorted in the radial direction and from being damaged such as a crack in the inner ring 3.
[0022]
Moreover, in the case of the manufacturing method of the present invention, the inner ring 3 is externally fitted to the support step portion 8a of the hub 2b before the caulking portion 17 is formed, and preload is applied to the rolling elements 5 and 5 respectively. In this state, the outer end surface of the inner ring 3 and the stepped surface 12 formed on the outer peripheral surface of the hub 2b remain in contact with each other regardless of the axial load based on the preload. Accordingly, even when a force in the tilt direction is applied to the inner ring 3 with respect to the central axis of the inner ring 3 and the hub 2b as the caulking portion 17 is formed, the peripheral edge of the outer end opening of the inner ring 3 supports the support. It is possible to prevent the inner surface of the inner ring 3 from rubbing strongly against the outer peripheral surface of the stepped portion 8a and the central shaft of the hub 2b from being inclined. In the case of this example, the first inner ring raceway 7 (not shown) is directly formed on the outer peripheral surface of the hub 2b. However, a separate inner ring having the first inner ring raceway formed on the outer peripheral surface is externally fitted. You may do it.
[0023]
Next, FIG. 2 shows a second example of an embodiment of the present invention corresponding to claims 1 and 2 . In the case of the rolling bearing unit 1a for supporting a wheel manufactured by the manufacturing method of this example, a part of the support step 8b formed at the inner end of the hub 2b is a part that becomes a starting point of a part that is bent along with caulking and spreading work. The outer diameter d 1 on the inner end side of a portion closer to the outer end than a certain stepped portion 26 is made smaller than the outer diameter d 2 on the outer end side of the portion closer to the outer end. (D 1 <d 2 ). For this reason, in the case of this example, the outer diameter d 1 of the inner half portion of the outer peripheral surface of the portion of the support step portion 8b that is closer to the outer end than the step portion 26 is also set to the outer half portion. By slightly reducing the outer diameter d 2 of the portion (FIG. 2 shows the difference between the outer diameters d 1 and d 2 in an exaggerated manner), the supporting step portion 8b is changed to the large diameter portion 29. The small diameter part 30 is comprised. Also in this example, the inner ring 3 (FIGS. 5 to 9) is in a state before the caulking portion 17 (see FIG. 8) is formed by caulking and expanding the cylindrical portion 18 formed at the inner end portion of the support step portion 8b. Reference) is allowed to be fitted on at least the large-diameter portion 29 of the support step 8b by an interference fit. Other configurations and operations are the same as those in the first example described above, and thus redundant description is omitted.
[0024]
Next, FIG. 3 shows a third example of an embodiment of the present invention corresponding to claim 1 . Also in the case of the wheel support rolling bearing unit 1a manufactured by the manufacturing method of this example, a part of the support step portion 8c formed at the inner end portion of the hub 2b is a portion that becomes a starting point of a portion that is bent along with caulking and spreading work. The outer diameter d 1 on the inner end side of a portion closer to the outer end than a certain stepped portion 26 is made smaller than the outer diameter d 2 on the outer end side of the portion closer to the outer end. (D 1 <d 2 ). For this reason, in the case of this example, the outer peripheral surface of the inner half of the outer peripheral surface of the part of the support step portion 8c that is closer to the outer end than the stepped portion 26 is set to the inner end side in the axial direction. The taper surface portion 28a is slightly inclined in the direction in which the outer diameter decreases as it goes (FIG. 3 shows the inclination angle exaggerated). Also in this example, the inner ring 3 (FIGS. 5 to 9) is in a state before the caulking portion 17 (see FIG. 8) is formed by caulking and expanding the cylindrical portion 18 formed at the inner end portion of the support step portion 8c. Reference) is allowed to be fitted onto at least the outer half of the support step 8c by an interference fit. Other configurations and operations are the same as those of the first example described above, and thus redundant description is omitted.
[0025]
【The invention's effect】
Since the manufacturing method of the wheel-supporting rolling bearing unit of the present invention is configured and operates as described above, a small and lightweight wheel-supporting rolling bearing unit can be stably obtained.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing a first example of an embodiment of the present invention before a caulking portion is formed.
FIG. 2 is a view similar to FIG. 1 showing the second example.
FIG. 3 is a view similar to FIG. 1 showing the third example.
FIG. 4 is a half sectional view showing a first example of a conventional structure.
FIG. 5 is a half sectional view showing the second example.
FIG. 6 is a partially enlarged cross-sectional view showing a state in which the inner end portion of the hub is caulked and spread in order to fix the inner ring to the hub when the structure of the second example is manufactured.
FIG. 7 is a partially enlarged cross-sectional view showing a state before the inner end of the hub is caulked and spread.
FIG. 8 is a longitudinal sectional view of a main part of the swing press device.
FIG. 9 is a view similar to FIG. 7, showing an example of a reference structure of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 1a Rolling bearing unit for wheel support 2, 2a, 2b Hub 3 Inner ring 4 Outer ring 5 Rolling element 6 First flange 7 First inner ring raceway 8, 8a, 8b, 8c Support step 9 Second inner ring raceway 10 Male thread portion 11 Nut 12 Stepped surface 13 Locking concave portion 14 First outer ring raceway 15 Second outer ring raceway 16 Second flange 17 Caulking portion 18 Cylindrical portion 19 Taper hole 20 Stamping die 21 Protruding portion 22 Concavity portion 23 Oscillating press device 24 Holding jig 25 Holder 26 Stepped portion 27 Curved surface portion 28, 28a Tapered surface portion 29 Large diameter portion 30 Small diameter portion

Claims (2)

一端部外周面に第一のフランジを形成し、中間部外周面に第一の内輪軌道を直接又は別体の内輪を介して設けたハブと、このハブの他端部に形成した支持段部に外嵌され、外周面に第二の内輪軌道を形成した内輪と、内周面に上記第一の内輪軌道に対向する第一の外輪軌道及び上記第二の内輪軌道に対向する第二の外輪軌道を形成した外輪と、上記第一、第二の内輪軌道と上記第一、第二の外輪軌道との間に、それぞれ複数個ずつ設けられた転動体とを備え、上記支持段部の他端部で少なくともこの支持段部に外嵌した内輪よりも突出した部分に形成した円筒部を直径方向外方にかしめ広げる事で形成したかしめ部により、上記ハブに外嵌した内輪をこのハブに結合固定する車輪支持用転がり軸受ユニットの製造方法に於いて、このハブとして、上記支持段部の一部でかしめ広げ作業に伴って折れ曲がる部分の起点となる部分であり、この支持段部の一端寄り部分の外径よりも他端寄り部分の外径を小さくした段差部よりも、更に一端に寄った、上記支持段部の一端寄り部分のうちの他端側の外径を、この一端寄り部分の一端側の外径に比べて小さくなったものを使用し、上記内輪を上記支持段部に、上記各転動体に予圧を付与しつつ、この内輪の一端面を上記支持段部の段差面に突き当てるまで締り嵌めで外嵌すると共に、この締り嵌めに基づいて上記内輪に加わる静止摩擦力を、上記各転動体に付与された予圧に基づいてこの内輪に加わる軸方向荷重よりも大きくした状態から、上記円筒部を直径方向外方にかしめ広げる事で上記かしめ部を形成する事を特徴とする車輪支持用転がり軸受ユニットの製造方法。A hub in which a first flange is formed on the outer peripheral surface of one end and a first inner ring raceway is provided on the outer peripheral surface of the intermediate portion directly or via a separate inner ring, and a support step formed on the other end of the hub An inner ring having a second inner ring raceway formed on the outer peripheral surface, a first outer ring raceway facing the first inner ring raceway and a second outer ring facing the second inner ring raceway on the inner peripheral surface. An outer ring that forms an outer ring raceway, and a plurality of rolling elements provided between each of the first and second inner ring raceways and the first and second outer ring raceways. At the other end, the inner ring that is externally fitted to the hub is fitted to the hub by a caulking portion that is formed by caulking and expanding the cylindrical portion formed at a portion protruding from the inner ring that is externally fitted to the support step. In the manufacturing method of the wheel bearing rolling bearing unit that is coupled and fixed to A portion to be the starting point of the portion bent with the crimping spread working part of the supporting stepped portion, the stepped portion of the outer diameter was small near the other end portion than the outer diameter of the end portion near the supporting step portion than, closer further to one end, the outer diameter of the other end of the near one end portion of the supporting stepped portion, using what has become smaller than the outer diameter of one end side of the end portion closer, the While the inner ring is applied to the support step portion and preload is applied to each of the rolling elements, the inner ring is externally fitted with an interference fit until it abuts against the step surface of the support step portion, and based on the interference fit. From the state in which the static friction force applied to the inner ring is larger than the axial load applied to the inner ring based on the preload applied to the rolling elements, the cylindrical portion is caulked outward in the diametrical direction to spread the caulking. For wheel support characterized by forming part Method of manufacturing a gully bearing unit. ハブとして、支持段部の一部でかしめ広げ作業に伴って折れ曲がる部分の起点となる部分よりも一端に寄った、上記支持段部の一端寄り部分のうちの他端側の外径を、同じくこの一端寄り部分の一端側の外径に比べて小さくする為に、この一端側を大径部とし、上記他端側を小径部としたものを使用する、請求項１に記載した車輪支持用転がり軸受ユニットの製造方法。As the hub, the outer diameter on the other end side of the portion near one end of the support step portion, which is closer to one end than the starting point of the portion that bends along with the caulking and spreading work at a part of the support step portion , 2. The wheel support according to claim 1, wherein the one end side is a large diameter portion and the other end side is a small diameter portion so as to be smaller than the outer diameter on one end side of the portion closer to one end. A method for manufacturing a rolling bearing unit.
JP2001187531A 2001-06-21 2001-06-21 Manufacturing method of wheel bearing rolling bearing unit Expired - Fee Related JP4682459B2 (en)

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JP4543705B2 (en) * 2004-03-03 2010-09-15 日本精工株式会社 Hub unit for wheels
JP2007024208A (en) * 2005-07-19 2007-02-01 Ntn Corp Bearing device for wheel
JP4521878B2 (en) * 2006-03-02 2010-08-11 Ｎｔｎ株式会社 Wheel bearing device
JP2011075096A (en) * 2009-09-02 2011-04-14 Toyota Auto Body Co Ltd Mounting structure for rotating member

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Publication number Priority date Publication date Assignee Title
JPH11129703A (en) * 1997-08-28 1999-05-18 Nippon Seiko Kk Rolling bearing unit for wheel supporting
JP2000087976A (en) * 1998-09-09 2000-03-28 Koyo Seiko Co Ltd Bearing device
JP2001130210A (en) * 1999-11-10 2001-05-15 Koyo Seiko Co Ltd Bearing device
JP2001241450A (en) * 1999-12-20 2001-09-07 Nsk Ltd Rolling bearing unit for supporting wheel and its manufacturing method
JP2003507683A (en) * 1999-08-25 2003-02-25 ザ ティムケン カンパニー Hub assembly with constrained ring and method of assembling the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11129703A (en) * 1997-08-28 1999-05-18 Nippon Seiko Kk Rolling bearing unit for wheel supporting
JP2000087976A (en) * 1998-09-09 2000-03-28 Koyo Seiko Co Ltd Bearing device
JP2003507683A (en) * 1999-08-25 2003-02-25 ザ ティムケン カンパニー Hub assembly with constrained ring and method of assembling the same
JP2001130210A (en) * 1999-11-10 2001-05-15 Koyo Seiko Co Ltd Bearing device
JP2001241450A (en) * 1999-12-20 2001-09-07 Nsk Ltd Rolling bearing unit for supporting wheel and its manufacturing method

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