JP4576704B2 - Rolling bearing unit for wheel support - Google Patents

Rolling bearing unit for wheel support Download PDF

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Publication number
JP4576704B2
JP4576704B2 JP2000362464A JP2000362464A JP4576704B2 JP 4576704 B2 JP4576704 B2 JP 4576704B2 JP 2000362464 A JP2000362464 A JP 2000362464A JP 2000362464 A JP2000362464 A JP 2000362464A JP 4576704 B2 JP4576704 B2 JP 4576704B2
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inner ring
hub
caulking
bearing unit
peripheral surface
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JP2001241456A (en
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裕也 宮崎
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NSK Ltd
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NSK Ltd
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Priority to JP2000362464A priority Critical patent/JP4576704B2/en
Application filed by NSK Ltd filed Critical NSK Ltd
Priority to DE60005124T priority patent/DE60005124T2/en
Priority to EP00127832A priority patent/EP1111257B1/en
Priority to DE60020754T priority patent/DE60020754T2/en
Priority to EP03018369A priority patent/EP1387101B1/en
Priority to US09/739,665 priority patent/US6553666B2/en
Publication of JP2001241456A publication Critical patent/JP2001241456A/en
Priority to US10/247,477 priority patent/US6669374B2/en
Priority to US10/694,895 priority patent/US6862808B2/en
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Publication of JP4576704B2 publication Critical patent/JP4576704B2/en
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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

Description

【０００１】
【発明の属する技術分野】
この発明に係る車輪支持用転がり軸受ユニットは、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。
【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段部８を、それぞれ形成している。
【０００３】
上記段部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の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により得られるかしめ部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を揺動回転させる。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を、このハブ２ａの中心軸を中心として回転させる。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】
図５〜７に示した従来構造の第２例を造る場合には、内輪３をハブ２ａの段部８に対して締り嵌めにより外嵌する事が好ましい。この理由は、この段部８に上記内輪３を外嵌した後、上記ハブ２ａの内端部にかしめ部１７を形成する以前に、このハブ２ａに対する上記内輪３の位置がずれない様にする為である。例えば、各転動体５、５に予圧を付与する場合、上記かしめ部１７を形成する以前に上記内輪３の位置がずれ動かない様にする為には、上記内輪３を上記段部８に対して締り嵌めにより外嵌する必要がある。又、予圧を付与しない場合でも、何らかの原因で上記かしめ部１７を形成する以前に上記内輪３の位置がずれ動かない様にする為には、この内輪３を上記段部８に対して締り嵌めにより外嵌する事が好ましい。
【００１２】
上記かしめ部１７を形成する以前に上記内輪３がずれ動くのを確実に防止する為には、上記段部８に対する上記内輪３の締め代は大きい程好ましいが、この締め代を徒に大きくすると、この内輪３に亀裂が発生し、車輪支持用転がり軸受ユニットとして機能しなくなる。しかも、車輪支持用転がり軸受ユニットとして完成した状態で上記内輪３に加わる応力は、上記締り嵌めに基づく応力だけでなく、上記かしめ部１７を形成する事に伴う応力も加わる。即ち、このかしめ部１７の形成作業に伴って上記内輪３には、直径方向外方に向いた力が加わる為、この内輪３には、上記締り嵌めに基づく力と、上記かしめ部１７の形成作業に伴う力との合計が、円周方向に亙る引っ張り応力として加わる。上記車輪支持用転がり軸受ユニットの信頼性及び耐久性を確保する為には、上述の様な２種類の力の合計に拘らず、内輪３に亀裂が発生しない様にする必要がある。
本発明の車輪支持用転がり軸受ユニットは、この様な事情に鑑みて発明したものである。
【００１３】
【課題を解決するための手段】
本発明の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、中間部外周面に第一の内輪軌道を、それぞれ形成したハブと、このハブの他端部に形成された、上記第一の内輪軌道を形成した部分よりも外径寸法が小さくなった段部と、外周面に第二の内輪軌道を形成して上記段部に外嵌した内輪と、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、外周面に第二のフランジを、それぞれ形成した外輪と、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、上記ハブの他端部で少なくとも上記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、上記段部に外嵌した内輪をこの段部の段差面に向け抑え付けて、この段部に外嵌した内輪を上記ハブに結合固定している。
【００１４】
特に、本発明の車輪支持用転がり軸受ユニットに於いては、上記内輪は上記段部に対し締り嵌めで外嵌されている。又、上記各転動体には、上記円筒部を直径方向外方にかしめ広げる以前に、上記内輪の端面を上記段差面に突き当てた状態で、予圧が付与されている。そして、上記締り嵌めに基づいて上記内輪に加わる静止摩擦力が、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なる様に、且つ、上記締り嵌めに基づいてこの内輪に生じる円周方向に関する応力が、この内輪の円周方向に関する許容応力から、上記かしめ部を形成する事に伴ってこの内輪に加わる円周方向の応力を引いた値よりも小さくなる様に、上記段部に対する上記内輪の締め代を規制している。
又、本発明を実施する場合に好ましくは、例えば請求項２に記載した発明の様に、上記円筒部を直径方向外方にかしめ広げる以前の状態で、上記ハブの他端部のうちで上記内輪を外嵌した部分よりも突出した部分の外径を、この内輪を外嵌した部分の外径よりも小さくし、これら外径の異なる部分同士を段差部により連続させる。
更に、上述した請求項２に記載した発明を実施する場合に好ましくは、例えば請求項３に記載した発明の様に、上記段差部の段差の大きさを、０．０２〜０．１２mmとする。
【００１５】
【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によれば、ハブの端部にかしめ部を形成する以前に、段部に外嵌した内輪の位置が不用意にずれ動く事を防止し、しかもこの内輪に亀裂が発生する事を防止できる。又、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、上記内輪の端面を上記ハブの段差面に当接した状態のままにできる。この為、かしめ部の形成作業に伴って上記内輪に、この内輪及び上記ハブの中心軸に対し傾斜方向の力が加わっても、この内輪の外端開口周縁部が上記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。
【００１６】
【発明の実施の形態】
図１〜２は、本発明の実施の形態の第１例を示している。尚、本発明の特徴は、ハブ２ｂの内端部外周面に形成した段部８に内輪３を外嵌固定する部分の構造に関する。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例と同様であるから、同等部分に関する説明は、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。
【００１７】
上記ハブ２ｂの内端部外周面に形成した段部８に上記内輪３を、締り嵌めにより外嵌している。特に、本発明の車輪支持用転がり軸受ユニットの場合には、上記段部８に対する上記内輪３の締め代ｄの最大値ｄmax を規制して、この内輪３に亀裂が発生するのを防止している。即ち、この段部８に内輪３を、締め代ｄを持って外嵌する（締り嵌めする）事に伴い、この内輪３には円周方向に関する応力δ3 が発生する。又、上記ハブ２ｂの内端部に形成した円筒部１８を直径方向外方にかしめ広げてかしめ部１７（図５〜６参照）を形成する事に伴って、上記内輪３に円周方向の応力δr が加わる。本発明の車輪支持用転がり軸受ユニットの場合には、上記締り嵌めに基づいて内輪３に加わる応力δ3 と上記かしめ部１７の形成作業に伴ってこの内輪３に加わる応力δr との和よりも、この内輪３の円周方向に関する許容応力δa が大きくなる（δa ＞δ3 ＋δr ）様に、上記締め代ｄの最大値ｄmax を規制している。
【００１８】
更に、本例の場合には、この内輪３の外端面を上記段部８の段差面１２に突き当てた状態で、各転動体５、５に所望の予圧を付与している。そして、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している。従って、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は、上記ハブ２ｂの内端部に形成した円筒部１８をかしめ広げる以前でも、上記内輪３はそのまま（内輪３の外端面を段差面１２に突き当てたまま）の位置に保持される。
【００１９】
上述の様に上記内輪３を上記ハブ２ｂの段部８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、図２に示す様なかしめ部１７を形成する。特に、本発明の車輪支持用転がり軸受ユニットによれば、上記かしめ部１７を形成した状態でも、上記内輪３に加わる応力は、上記許容応力δa 未満に抑えられる。
【００２０】
又、図示の例によれば、上述の様にして上記かしめ部１７を形成する際に、上記ハブ２ｂに対して上記内輪３を変位させる事がない。即ち、この内輪３は、上記かしめ部１７を形成する以前に上記ハブ２ｂの段部８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段部８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がない。
【００２１】
更に、図示の例では、上記ハブ２ｂの内端部で、上記内輪３との嵌合部よりも突出した部分の外径を、この嵌合部の外径よりも小さくしている。即ち、上記ハブ２ｂの内端部に形成した円筒部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２６よりも少しだけ第二の内輪軌道９に寄った部分に、０．０２〜０．１２mm程度の僅かな段差Ｈを有する、断面円弧状の段差部２７を形成している。そして、上記円筒部１８のうちの外径の小さくなった部分を、揺動かしめにより直径方向外方にかしめ広げ、上記曲面部２６を抑え付ける様にしている。この様に円筒部１８を直径方向外方にかしめ広げる際には、上記段差部２７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って、かしめ広げ部分に亀裂等の損傷が発生しにくくなる。
【００２２】
次に、図３は、本発明の実施の形態の第２例を示している。本例の場合には、ハブ２ｃの中間部外周面に第一の内輪軌道７を設けるのに、このハブ２ｃの中間部に、外周面に第一の内輪軌道７を形成した別体の内輪３ａを外嵌している。この図３に示す車輪支持用転がり軸受ユニット１ｂの場合には、この別体の内輪３ａの内端面が段差面１２ａとなり、上記ハブ２ｃの内端部でこの段差面１２ａよりも内方に突出した部分が、外周面に第二の内輪軌道９を形成した内輪３を外嵌する為の段部８ａとなる。この様な本例の場合も、上述した第１例の場合と同様に、上記ハブ２ｃの内端部に対する上記内輪３の締め代を規制する事により、かしめ部１７を形成する以前に上記内輪３の位置が不用意にずれ動く事を防止し、しかもこの内輪３に亀裂が発生する事を防止できる。
【００２３】
【発明の効果】
本発明は、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】同じくかしめ部を形成した後の状態で示す半部断面図。
【図３】本発明の実施の形態の第２例を、かしめ部を形成した後の状態で示す半部断面図。
【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。
【符号の説明】
１、１ａ、１ｂ 車輪支持用転がり軸受ユニット
２、２ａ、２ｂ、２ｃ ハブ
３、３ａ 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 段部
９ 第二の内輪軌道
１０ 雄ねじ部
１１ ナット
１２、１２ａ 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 曲面部
２７ 段差部[0001]
BACKGROUND OF THE INVENTION
The wheel support rolling bearing unit according to the present invention is used for rotatably supporting the 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 step portion 8 having a smaller outer diameter is formed on the inner end portion.
[0003]
The step 8 is fitted with the inner ring 3 having a second inner ring raceway 9 formed on the outer peripheral surface thereof. 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. The inner ring 3 is clamped and fixed to a predetermined position of the hub 2 by sandwiching the inner ring 3 between a nut 11 screwed into the male threaded portion 10 and a stepped surface 12 of the stepped portion 8. . 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 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 plastic deformation of 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 stepped surface 12 of the stepped portion 8 formed at the inner end of the hub 2a, so that 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 and rotated 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 rotated around the central axis of the hub 2a. 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]
When the second example of the conventional structure shown in FIGS. 5 to 7 is manufactured, it is preferable that the inner ring 3 is externally fitted to the step portion 8 of the hub 2a by an interference fit. The reason for this is that after the inner ring 3 is fitted on the step portion 8 and before the caulking portion 17 is formed at the inner end of the hub 2a, the position of the inner ring 3 with respect to the hub 2a is not shifted. Because of that. For example, when preload is applied to the rolling elements 5, 5, the inner ring 3 is moved relative to the stepped portion 8 in order to prevent the inner ring 3 from being displaced before the caulking portion 17 is formed. It is necessary to externally fit with an interference fit. Even in the case where no preload is applied, in order to prevent the position of the inner ring 3 from shifting and shifting before the caulking portion 17 is formed for some reason, the inner ring 3 is tightly fitted to the stepped portion 8. It is preferable to externally fit.
[0012]
In order to surely prevent the inner ring 3 from shifting and moving before the caulking portion 17 is formed, it is preferable that the tightening allowance of the inner ring 3 with respect to the step portion 8 is larger. The inner ring 3 is cracked and does not function as a wheel bearing rolling bearing unit. Moreover, the stress applied to the inner ring 3 in the state of being completed as a wheel support rolling bearing unit is not only the stress based on the interference fit but also the stress accompanying the formation of the caulking portion 17. That is, as the caulking portion 17 is formed, a force directed outward in the diameter direction is applied to the inner ring 3, so that the force based on the interference fit and the caulking portion 17 are formed on the inner ring 3. The total with the force accompanying the work is added as a tensile stress in the circumferential direction. In order to ensure the reliability and durability of the wheel support rolling bearing unit, it is necessary to prevent the inner ring 3 from cracking regardless of the total of the two types of forces as described above.
The wheel bearing rolling bearing unit of the present invention has been invented in view of such circumstances.
[0013]
[Means for Solving the Problems]
The wheel support rolling bearing unit of the present invention is formed with a first flange on the outer peripheral surface of one end and a first inner ring raceway on the outer peripheral surface of the intermediate portion in the same manner as the conventional wheel support rolling bearing unit described above. A hub, a step formed on the other end of the hub and having a smaller outer diameter than the portion forming the first inner ring raceway, and a second inner ring raceway formed on the outer peripheral surface. An inner ring externally fitted to the stepped portion, a first outer ring raceway facing the first inner ring raceway and a second outer ring raceway facing the second inner ring raceway on the inner peripheral surface, and a second outer ring raceway on the outer peripheral surface. And a plurality of rolling elements each provided between the first and second inner ring raceways and the first and second outer ring raceways. Then, at the other end of the hub, at least the cylindrical portion formed in the portion protruding from the inner ring that is externally fitted to the stepped portion is externally fitted to the stepped portion by the caulking portion that is formed by caulking outward in the diameter direction. The inner ring is pressed against the step surface of the stepped portion, and the inner ring fitted on the stepped portion is coupled and fixed to the hub.
[0014]
In particular, in the rolling bearing unit for supporting a wheel according to the present invention, the inner ring is externally fitted to the stepped portion with an interference fit. Each rolling element is preloaded with the end face of the inner ring abutting against the step surface before the cylindrical portion is caulked outward in the diametrical direction. 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, and based on the interference fit . The circumferential stress generated in the inner ring is smaller than the allowable stress in the circumferential direction of the inner ring minus the circumferential stress applied to the inner ring as the caulking portion is formed. Similarly, the tightening margin of the inner ring with respect to the stepped portion is regulated.
Further, when the present invention is carried out, it is preferable that, in the state before the cylindrical portion is caulked outward in the diametrical direction, for example, as in the second aspect of the invention, the other end portion of the hub The outer diameter of the part protruding from the part fitted with the inner ring is made smaller than the outer diameter of the part fitted with the inner ring, and the parts having different outer diameters are made continuous by the step part.
Further, when the invention described in claim 2 described above is carried out, preferably, the step size of the stepped portion is set to 0.02 to 0.12 mm as in the invention described in claim 3. .
[0015]
[Action]
According to the rolling bearing unit for supporting a wheel of the present invention configured as described above, the position of the inner ring externally fitted to the stepped portion is prevented from inadvertently shifting before the caulked portion is formed at the end of the hub. Moreover, it is possible to prevent the inner ring from cracking. Further, with the preload applied to each rolling element, the end surface of the inner ring can be kept in contact with the stepped surface of the hub regardless of the axial load based on the preload. For this reason, even when a force in an inclined direction is applied to the inner ring and the central axis of the hub as the caulking portion is formed, the outer peripheral edge of the inner ring and the outer peripheral surface of the stepped portion It is possible to prevent strong rubbing and tilting of the central axis of the inner ring with respect to the central axis of the hub.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show a first example of an embodiment of the present invention. The feature of the present invention relates to the structure of the portion where the inner ring 3 is fitted and fixed to the step portion 8 formed on the outer peripheral surface of the inner end portion of the hub 2b. Since the entire structure and operation of the wheel-supporting rolling bearing unit 1a are the same as those of the second example of the conventional structure shown in FIG. 5 described above, description of equivalent parts will be omitted or simplified. The description will focus on the part.
[0017]
The inner ring 3 is externally fitted to the stepped portion 8 formed on the outer peripheral surface of the inner end portion of the hub 2b by an interference fit. In particular, in the case of the rolling bearing unit for supporting a wheel according to the present invention, the maximum value d max of the tightening allowance d of the inner ring 3 with respect to the step portion 8 is regulated to prevent the inner ring 3 from cracking. ing. That is, as the inner ring 3 is externally fitted to the stepped portion 8 with a fastening allowance d (tightened), stress δ 3 in the circumferential direction is generated in the inner ring 3. In addition, the cylindrical portion 18 formed on the inner end portion of the hub 2b is caulked outward in the diametrical direction to form a caulking portion 17 (see FIGS. 5 to 6). Stress δ r is applied. In the case of the rolling bearing unit for supporting a wheel according to the present invention, the sum of the stress δ 3 applied to the inner ring 3 based on the interference fit and the stress δ r applied to the inner ring 3 as the caulking portion 17 is formed. However, the maximum value d max of the interference allowance d is regulated so that the allowable stress δ a in the circumferential direction of the inner ring 3 becomes large (δ a > δ 3 + δ r ).
[0018]
Furthermore, in the case of this example, a desired preload is applied to the rolling elements 5 and 5 with the outer end surface of the inner ring 3 abutted against the step surface 12 of the step portion 8. 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. Accordingly, in the state where the outer end surface of the inner ring 3 is abutted against the stepped surface 12 and a desired preload is applied to the rolling elements 5 and 5 as described above, the cylindrical portion formed at the inner end portion of the hub 2b. Even before caulking 18, the inner ring 3 is held in a position as it is (while the outer end surface of the inner ring 3 is abutted against the step surface 12).
[0019]
As described above, when the inner ring 3 is externally fitted to the step portion 8 of the hub 2b and preload is applied to each of the rolling elements 5, 5 as in the case of the prior art described above, the inner ring 3 is swung. By caulking the cylindrical portion 18 outward in the diameter direction, the caulking portion 17 as shown in FIG. 2 is formed. In particular, according to the wheel supporting rolling bearing unit of the present invention, even when the formation of the caulking portion 17, stress applied to the inner ring 3 is suppressed to less than the allowable stress [delta] a.
[0020]
Further, according to the illustrated example, when the caulking portion 17 is formed as described above, the inner ring 3 is not displaced with respect to the hub 2b. That is, the inner ring 3 is externally fitted to the step portion 8 of the hub 2b before the caulking portion 17 is formed, and the axial direction based on the preload is applied while the rolling elements 5 and 5 are preloaded. Regardless of the load, the outer end surface of the inner ring 3 remains in contact with the stepped surface 12 formed on the outer peripheral surface of the hub 2b. Therefore, 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 outer peripheral edge of the outer end opening of the inner ring 3 is There is no strong rubbing against the outer peripheral surface of the portion 8 and the central axis of the inner ring 3 is not inclined with respect to the central axis of the hub 2b.
[0021]
Further, in the illustrated example, the outer diameter of the portion protruding from the fitting portion with the inner ring 3 at the inner end portion of the hub 2b is made smaller than the outer diameter of the fitting portion. That is, the outer peripheral surface of the base end portion of the cylindrical portion 18 formed at the inner end portion of the hub 2b is formed on the inner end opening portion of the inner ring 3 more than the curved surface portion 26 having a quarter arc shape in cross section. A slightly stepped portion 27 having an arc-shaped cross section having a slight step H of about 0.02 to 0.12 mm is formed in a portion slightly approaching the second inner ring raceway 9. A portion of the cylindrical portion 18 having a reduced outer diameter is caulked and spread outward in the diametrical direction by swing caulking to suppress the curved surface portion 26. In this way, when the cylindrical portion 18 is caulked and spread outward in the diametrical direction, the stepped portion 27 becomes a starting point of a portion that is bent along with caulking and spreading work. For this reason, it is difficult to apply an excessive force to the cylindrical portion 18 with the caulking and spreading work, and damage such as cracks is less likely to occur in the caulking and spreading portion.
[0022]
Next, FIG. 3 shows a second example of the embodiment of the present invention. In the case of this example, the first inner ring raceway 7 is provided on the outer peripheral surface of the intermediate portion of the hub 2c, and a separate inner ring in which the first inner ring raceway 7 is formed on the outer peripheral surface of the intermediate portion of the hub 2c. 3a is externally fitted. In the case of the wheel support rolling bearing unit 1b shown in FIG. 3, the inner end surface of the separate inner ring 3a becomes the step surface 12a, and protrudes inward from the step surface 12a at the inner end portion of the hub 2c. This portion becomes a step portion 8a for externally fitting the inner ring 3 having the second inner ring raceway 9 formed on the outer peripheral surface. In the case of this example as well, as in the case of the first example described above, the inner ring 3 before the caulking portion 17 is formed by restricting the tightening margin of the inner ring 3 with respect to the inner end of the hub 2c. It is possible to prevent the position of 3 from being shifted inadvertently and to prevent the inner ring 3 from cracking.
[0023]
【The invention's effect】
Since the present invention is configured and operates as described above, a small and lightweight wheel support 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 in a state before a caulking portion is formed.
FIG. 2 is a half cross-sectional view showing a state after a caulking portion is formed.
FIG. 3 is a half sectional view showing a second example of an embodiment of the present invention in a state after a caulking portion is formed.
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 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 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.
[Explanation of symbols]
1, 1a, 1b Wheel support rolling bearing units 2, 2a, 2b, 2c Hub 3, 3a Inner ring 4 Outer ring 5 Rolling element 6 First flange 7 First inner ring raceway 8, 8a Step 9 Second inner raceway DESCRIPTION OF SYMBOLS 10 Male thread part 11 Nut 12, 12a Step surface 13 Locking recessed part 14 1st outer ring raceway 15 Second outer ring raceway 16 Second flange 17 Caulking part 18 Cylindrical part 19 Taper hole 20 Stamping die 21 Convex part 22 Concave part 23 Oscillation Press device 24 Holding jig 25 Holder 26 Curved surface portion 27 Step portion

Claims (3)

一端部外周面に第一のフランジを、中間部外周面に第一の内輪軌道を、それぞれ形成したハブと、このハブの他端部に形成された、上記第一の内輪軌道を形成した部分よりも外径寸法が小さくなった段部と、外周面に第二の内輪軌道を形成して上記段部に外嵌した内輪と、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、外周面に第二のフランジを、それぞれ形成した外輪と、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、上記ハブの他端部で少なくとも上記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、上記段部に外嵌した内輪をこの段部の段差面に向け抑え付けて、この段部に外嵌した内輪を上記ハブに結合固定した車輪支持用転がり軸受ユニットに於いて、上記内輪は上記段部に対し締り嵌めで外嵌されており、上記各転動体には、上記円筒部を直径方向外方にかしめ広げる以前に、上記内輪の端面を上記段差面に突き当てた状態で、予圧が付与されており、上記締り嵌めに基づいて上記内輪に加わる静止摩擦力が、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なる様に、且つ、上記締り嵌めに基づいてこの内輪に生じる円周方向に関する応力が、この内輪の円周方向に関する許容応力から、上記かしめ部を形成する事に伴ってこの内輪に加わる円周方向の応力を引いた値よりも小さくなる様に、上記段部に対する上記内輪の締め代を規制している事を特徴とする車輪支持用転がり軸受ユニット。A hub formed with a first flange on the outer peripheral surface of one end and a first inner ring raceway on the outer peripheral surface of the intermediate portion, and a part formed with the first inner ring raceway formed on the other end of the hub A step portion having a smaller outer diameter, a second inner ring raceway formed on the outer peripheral surface and fitted on the stepped portion, and a first inner portion facing the first inner ring raceway on the inner peripheral surface. The outer ring raceway and the second outer ring raceway facing the second inner ring raceway, the outer ring formed with the second flange on the outer peripheral surface, the first and second inner ring raceways and the first and second A plurality of rolling elements provided between each of the two outer ring raceways, and a cylindrical portion formed at a portion projecting from at least the inner ring externally fitted to the stepped portion at the other end of the hub. The inner ring that is externally fitted to the stepped portion is formed by the caulking portion that is formed by caulking outward in the direction. In the rolling bearing unit for wheel support in which the inner ring that is externally fitted to the stepped portion is pressed against the stepped surface of the portion and fixed to the hub, the inner ring is externally fitted to the stepped portion by an interference fit Each rolling element is preloaded with the end face of the inner ring abutting against the step surface before the cylindrical portion is caulked outward in the diametrical direction, and is based on the interference fit. The circumferential friction generated in the inner ring based on the interference fit so that the static frictional 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. For the stepped portion, the stress related to the direction is smaller than the value obtained by subtracting the circumferential stress applied to the inner ring as the caulking portion is formed from the allowable stress related to the circumferential direction of the inner ring. Tightening the inner ring Wheel support rolling bearing unit, characterized in that regulates a. 円筒部を直径方向外方にかしめ広げる以前の状態で、ハブの他端部のうちで内輪を外嵌した部分よりも突出した部分の外径が、この内輪を外嵌した部分の外径よりも小さく、これら外径の異なる部分同士が段差部により連続している、請求項１に記載した車輪支持用転がり軸受ユニット。Prior to caulking the cylindrical portion outward in the diametrical direction, the outer diameter of the portion of the other end of the hub that protrudes from the portion where the inner ring is fitted is larger than the outer diameter of the portion where the inner ring is fitted. The wheel bearing rolling bearing unit according to claim 1, wherein the portions having different outer diameters are continuous with each other by a stepped portion. 段差部の段差の大きさが、０．０２〜０．１２mmである、請求項２に記載した車輪支持用転がり軸受ユニット。The rolling bearing unit for wheel support according to claim 2, wherein the size of the step of the step portion is 0.02 to 0.12 mm.
JP2000362464A 1999-12-20 2000-11-29 Rolling bearing unit for wheel support Expired - Lifetime JP4576704B2 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
JP2000362464A JP4576704B2 (en) 1999-12-20 2000-11-29 Rolling bearing unit for wheel support
EP00127832A EP1111257B1 (en) 1999-12-20 2000-12-19 Wheel-support rolling bearing unit and method of manufacturing the same
DE60020754T DE60020754T2 (en) 1999-12-20 2000-12-19 Process for their production of a rolling bearing bearing unit
EP03018369A EP1387101B1 (en) 1999-12-20 2000-12-19 Method of manufacturing a wheel-support rolling bearing unit
DE60005124T DE60005124T2 (en) 1999-12-20 2000-12-19 Roller bearing unit and process for its manufacture
US09/739,665 US6553666B2 (en) 1999-12-20 2000-12-20 Wheel-support rolling bearing unit and method of manufacturing the same
US10/247,477 US6669374B2 (en) 1999-12-20 2002-09-20 Wheel-support rolling bearing unit and method of manufacturing the same
US10/694,895 US6862808B2 (en) 1999-12-20 2003-10-29 Wheel-support rolling bearing unit and method of manufacturing the same

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP36063199 1999-12-20
JP11-360631 1999-12-20
JP2000362464A JP4576704B2 (en) 1999-12-20 2000-11-29 Rolling bearing unit for wheel support

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JP2001241456A JP2001241456A (en) 2001-09-07
JP4576704B2 true JP4576704B2 (en) 2010-11-10

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4543705B2 (en) * 2004-03-03 2010-09-15 日本精工株式会社 Hub unit for wheels

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09220904A (en) * 1995-12-15 1997-08-26 Nippon Seiko Kk Hub unit for wheel support
JPH1095203A (en) * 1996-09-25 1998-04-14 Nippon Seiko Kk Rolling bearing unit for supporting wheel
JPH11148516A (en) * 1997-11-14 1999-06-02 Nippon Seiko Kk Double row roller bearing device
JP2000211302A (en) * 1999-01-26 2000-08-02 Nsk Ltd Rolling bearing unit for wheel support
JP2000229501A (en) * 1999-02-10 2000-08-22 Nsk Ltd Wheel supporting hub unit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09220904A (en) * 1995-12-15 1997-08-26 Nippon Seiko Kk Hub unit for wheel support
JPH1095203A (en) * 1996-09-25 1998-04-14 Nippon Seiko Kk Rolling bearing unit for supporting wheel
JPH11148516A (en) * 1997-11-14 1999-06-02 Nippon Seiko Kk Double row roller bearing device
JP2000211302A (en) * 1999-01-26 2000-08-02 Nsk Ltd Rolling bearing unit for wheel support
JP2000229501A (en) * 1999-02-10 2000-08-22 Nsk Ltd Wheel supporting hub unit

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