JP4604388B2 - Rolling bearing unit with combination seal ring with encoder - Google Patents

Rolling bearing unit with combination seal ring with encoder Download PDF

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Publication number
JP4604388B2
JP4604388B2 JP2001138350A JP2001138350A JP4604388B2 JP 4604388 B2 JP4604388 B2 JP 4604388B2 JP 2001138350 A JP2001138350 A JP 2001138350A JP 2001138350 A JP2001138350 A JP 2001138350A JP 4604388 B2 JP4604388 B2 JP 4604388B2
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ring
encoder
inner ring
peripheral surface
fixed
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JP2002333035A5 (en
JP2002333035A (en
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昌禎 棚橋
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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
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/007—Encoders, e.g. parts with a plurality of alternating magnetic poles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/783—Details of the sealing or parts thereof, e.g. geometry, material of the mounting region
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • 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

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

Description

【０００１】
【発明の属する技術分野】
この発明に係るエンコーダ付組み合わせシールリングを備えた転がり軸受ユニットは、自動車の車輪を懸架装置に対し回転自在に支持する。又、エンコーダ付組み合わせシールリングにより、転がり軸受ユニットを密封すると共に、この転がり軸受ユニットにより支持された車輪の回転速度を検出する。
【０００２】
【従来の技術】
自動車の車輪を懸架装置に対して回転自在に支持すると共に、アンチロックブレーキシステム（ＡＢＳ）やトラクションコントロールシステム（ＴＣＳ）を制御すべく、この車輪の回転速度を検出する為に従来から、例えば特開昭６４−２１２１９号公報に記載されている様なエンコーダ付転がり軸受ユニットが知られている。又、転がり軸受ユニットの端部開口を塞ぐシールリングの一部にエンコーダを組み付ける構造も、例えば特開平５−２６２３３号公報、同５−２３８３６９号公報、同６−２８１０１８号公報、同９−２７４０５１号公報、同１１−４４７０２号公報、欧州特許公報EP 0 495 323 A1 等に記載されている様に、従来から知られている。
【０００３】
車輪の回転速度検出を磁気的に行なう場合、上記エンコーダとして、円周方向に関して磁気特性が交互に（一般的には等間隔に）変化するものを使用する。この様に円周方向に関して磁気特性が交互に変化するエンコーダとしては、磁性材に円周方向に亙り多数の除肉部と充実部とを交互に形成したもの、或はＳ極とＮ極とを交互に配置した永久磁石が使用される。このうち、永久磁石製のエンコーダは、センサ側の構造を簡単に構成し、しかも低速時の検出精度を確保する面から、近年使用される場合が増大している。
【０００４】
図２は、この様な永久磁石製のエンコーダを使用したエンコーダ付組み合わせシールリングを備えた転がり軸受ユニットの従来構造の１例を示している。このエンコーダ付組み合わせシールリング１は、固定輪である外輪２の端部に内嵌固定するシールリング３と、鋼板或はステンレス鋼板等の磁性金属板製で、回転輪である内輪４の端部に外嵌固定するスリンガ５と、このスリンガ５に支持固定されるエンコーダ６とを備える。
【０００５】
このうちのシールリング３は、断面Ｌ字形で全体が円環状の芯金７と、弾性材８とから成る。このうちの芯金７は、軟鋼板等の金属板により、断面Ｌ字形で全体を円環状に形成して成り、上記外輪２の端部内周面に締り嵌めにより内嵌固定される固定円筒部９と、この固定円筒部９の軸方向（図２の左右方向）端縁から、上記内輪４の外周面に向け、直径方向内方に折れ曲がった固定円輪部１０とを有する。又、上記弾性材８は、上記芯金７の全周に亙って添着されたもので、１乃至複数本（図示の例では３本）のシールリップ１１ａ〜１１ｃを有する。一般的には、上記弾性材８は、ゴム製とし、上記芯金７に対し焼き付けにより結合している。
【０００６】
一方、上記スリンガ５は、上記内輪４の端部外周面に締り嵌めにより外嵌固定される回転円筒部１２と、この回転円筒部１２の軸方向端縁から、上記外輪２の内周面に向け、直径方向に折れ曲がった回転円輪部１３とを備える。又、上記スリンガ５は、弾性材を備えず、上記回転円筒部１２の外周面及び上記回転円輪部１３の片側面で上記シールリップ１１ａ〜１１ｃの先端縁を摺接させる部分を、それぞれ平滑面としている。
【０００７】
上記エンコーダ６は、円周方向に亙って、Ｓ極とＮ極とを交互に配置したゴム磁石製である。即ち、このエンコーダ６は、ゴム中にフェライト粉末を混入したゴム磁石を円輪状に形成したもので、軸方向に亙って着磁している。着磁方向は、円周方向に亙って交互に且つ等間隔で変化させている。従って、上記エンコーダ６の側面にはＳ極とＮ極とが、円周方向に亙って交互に且つ等間隔で配置されている。この様なエンコーダ６は、上記回転円輪部１３の側面で上記各シールリップ１１ａ〜１１ｃとは反対側に位置する面に添着支持されている。又、上記エンコーダ６は、内周縁部を上記スリンガ５の上記回転円筒部１２と上記回転円輪部１３とを連続させる曲面部１４にまで延長している。これにより上記エンコーダ６と上記スリンガ５との接合強度の向上を図っている。
【０００８】
上述の様に構成するエンコーダ付組み合わせシールリング１を組み込む転がり軸受ユニットは、固定輪である上記外輪２を自動車の懸架装置に対して支持固定し、上記内輪４と共に回転輪を構成するハブに車輪を固定している。そして、この内輪４及びハブの外周面と上記外輪２の内周面との間に複数個の玉１５を、保持器１６により保持した状態で転動自在に設け、上記内輪４及びハブの上記外輪２に対する回転を自在としている。
【０００９】
又、上記外輪２の内周面と上記内輪４及びハブの外周面との間に存在する空間１７の開口端部を、上記エンコーダ付組み合わせシールリング１で塞ぐ事により、この空間１７に塵芥及び雨水等の異物が進入する事を防止すると共に、この空間１７部分に存在するグリースが外部に漏洩するのを防止する。即ち、上記外輪２の端部に前記固定円筒部８を内嵌固定すると共に、上記内輪４の端部に前記回転円筒部１２を締り嵌めで外嵌固定し、この状態で、上記シールリング３を構成するシールリップ１１ａ〜１１ｃの先端縁を上記回転円筒部１２の外周面及び前記回転円輪部１３の側面に摺接させる事により、上記空間１７の開口端部を塞いでいる。尚、上記空間１７の（図示しない）他方の開口端部は、エンコーダを備えない組み合わせシールリングにより塞ぐ。又、上記エンコーダ６の前記回転円輪部１３と反対側の面を図示しない回転速度検出器に対向させ、上記内輪４と共に回転輪を構成するハブに固定された車輪の回転速度を検出自在とする。尚、上記エンコーダ６の側面と上記内輪４の端面とは、一般的には同一平面上に位置させる。この理由は、上記エンコーダ６が内輪４の端面から突出する事によりこのエンコーダ６が損傷し易くなるのを防止すると共に、このエンコーダ６の側面が内輪４の端面より引っ込む事で、このエンコーダ６の側面とセンサの検出部とを近接対向させにくくなるのを防止する為である。
【００１０】
上述した従来構造の第１例のエンコーダ付組み合わせシールリングを備えた転がり軸受ユニットの場合、塵芥等の比較的大きい異物の進入は防止できるが、雨水や泥水等の進入を防ぐには不十分である。これは、図２に示す様に、上記エンコーダ６の内周縁部と上記内輪４の外周面との間に隙間１８が存在する為である。雨水等がこの隙間１８から進入した場合、上記エンコーダ５を構成する回転円筒部１２と内輪４との嵌合部の僅かな隙間から、上記雨水等が上記空間１７に進入する可能性がある。即ち、上記回転円筒部１２は内輪４の外周面に締り嵌めで外嵌するが、嵌合面が金属同士の接触であり、回転円筒部１２の内周面と内輪４の外周面の真円度や表面粗さ等の精度によっては、上記嵌合面同士の間に僅かな隙間が生じる。そして、上記空間１７内の圧力が外部の圧力より（例えば温度変化により）低下した時、上記隙間１８から進入した雨水等を空間１７内に吸い込む可能性がある。そして、この空間１７内に水分が入り込んだ場合には、上記内輪４及び外輪２の各軌道面及び玉１５の転動面が錆びて、転がり軸受ユニットの性能及び寿命の低下を招く。
【００１１】
上述の様な雨水等の空間１７内への進入を防ぐ為、図３に示す様なエンコーダ付組み合わせシールリング１ａを使用する事が考えられる。この改良された構造では、エンコーダ６ａの内周縁に舌状部１９を、全周に亙って形成している。スリンガ５に設けた回転円筒部１２を内輪４の端部に外嵌した状態でこの舌状部１９は、弾性的に圧縮された状態で内輪４の外周面に当接する。即ち、上記舌状部１９の自由状態での内径は上記内輪４の外径よりも小さく、上記エンコーダ６ａを回転円輪部１３に添着したスリンガ５の回転円筒部１２を内輪４に外嵌すると、上記舌状部１９は弾性変形した状態で内輪４の外周面に当接する。この改良された構造では、この舌状部１９がこの内輪４の外周面に、全周に亙り弾性的に当接する事で、上記回転円筒部１２と内輪４との嵌合部をシールする。この結果、雨水等が上記回転円筒部１２と内輪４との嵌合部を通って上記空間１７内に進入する事を十分に防止できる。
【００１２】
【発明が解決しようとする課題】
しかし、上述した様な改良された構造では、舌状部１９により空間１７内への雨水等の進入を防ぐ事はできるが、この舌状部１９が上記内輪４の外周面に当接して弾性変形する事に伴い、図３に鎖線で示す様に、舌状部１９の一部が、エンコーダ５ａの本体部分の側面及び上記内輪４の端面から軸方向に突出する。この様にして内輪４の端面から突出した突出部２０は、回転速度検出等の機能上の問題とはならないが、搬送時等に、他の部材と干渉し、エンコーダ６ａの破損に結び付く可能性があり、好ましくない。
本発明のエンコーダ付組み合わせシールリングを備えた転がり軸受ユニットは、上述の様な事情に鑑みて発明したものである。
【００１３】
【課題を解決する為の手段】
本発明のエンコーダ付組み合わせシールリングを備えた転がり軸受ユニットは、固定輪である外輪と、回転輪である内輪と、この外輪の内周面とこの内輪の外周面との間に転動自在に設けた複数の転動体と、この外輪の内周面とこの内輪の外周面との間に存在する空間の開口端部を塞ぐと共に、上記内輪の回転速度を検出する為に使用するエンコーダ付組み合わせシールリングとを備える。
又、上記内輪の外周面のうちの上記空間の開口端部側の端縁部に、面取りを形成している。
又、上記エンコーダ付組み合わせシールリングは、上記外輪の内周面に固定されるシールリングと、上記内輪の外周面に固定される金属製のスリンガと、このスリンガに支持固定されるエンコーダとを備える。
又、上記シールリングは、上記外輪の内周面に嵌合固定される固定円筒部及びこの固定円筒部の端縁から径方向内方に折れ曲がった固定円輪部から成る芯金と、この芯金の全周に亙って添着された、シールリップを有する弾性材とを備える。
又、上記スリンガは、上記内輪の外周面に嵌合固定される回転円筒部と、この回転円筒部の端縁から径方向外方に折れ曲がった回転円輪部とを備えて、弾性材を備えず、上記回転円筒部の外周面及び上記回転円輪部の片側面で上記シールリップの先端縁を摺接させる部分を平滑面とすると共に、この回転円輪部のうちで上記回転円筒部との連続部を除く部分を平板状としている。
更に、上記エンコーダは、円周方向に亙ってＳ極とＮ極とを交互に配置したゴム磁石製で、上記回転円輪部の側面で上記シールリップとは反対側に位置する面に添着支持されていて、軸方向に関する厚さが、外周縁の係止部を形成した部分及び内周縁寄りの凹入部を形成した部分を除き、一定である。
特に、本発明のエンコーダ付組み合わせシールリングを備えた転がり軸受ユニットの場合、上記エンコーダの内周縁に、弾性変形した状態で上記内輪の外周面のうち上記面取りを形成した部分から外れた部分に当接する舌状部を全周に亙って形成すると共に、上記エンコーダの軸方向両側面のうちの上記回転円輪部と反対側面の内周縁寄り部分に、他の部分よりも上記回転円輪部側に凹入した凹入部を、全周に亙って設けている。
又、上記舌状部の先端縁を、上記内輪の外周面端縁部に形成した上記面取りの外径側に存在させ、この内輪の上記空間の開口端部側の端面から突出しない様にしている。
【００１４】
【作用】
上述の様に構成される本発明のエンコーダ付組み合わせシールリングを備えた転がり軸受ユニットで、外輪の内周面と内輪の外周面との間の空間内に異物が進入する事を防止すると共に、この空間内に充填されたグリースが外部に漏洩する事を防止する作用、及び、内輪の回転速度を検出自在とする作用は、前述の従来構造或は改良した構造のエンコーダ付組み合わせシールリングを備えた転がり軸受ユニットの場合と同様である。
特に、本発明のエンコーダ付組み合わせシールリングを備えた転がり軸受ユニットの場合、十分なシール性能を確保しつつ、エンコーダの一部が上記内輪の端面から突出しない様にできる。即ち、エンコーダの内周縁に形成した舌状部が、弾性的に圧縮された状態で、上記内輪の外周面のうち面取りを形成した部分から外れた部分に、全周に亙って当接する事により、上記エンコーダの内周縁と上記内輪との間を、全周に亙ってシールする。そして、この内輪と回転円筒部との嵌合面から上記空間内に雨水等が進入するのを防止する。又、上記エンコーダの軸方向両側面のうち、回転円輪部と反対側面で上記舌状部を形成した周縁寄り部分に、他の部分よりも上記回転円輪部側に凹入した凹入部を、上記内輪の外周面端縁部に上記面取りを、それぞれ設けている為、上記舌状部が上記内輪の外周面に当接して弾性変形しても、上記凹入部の存在により上記舌状部の弾性変形部分がこの凹入部内に留まり、上記舌状部が内輪の端面から突出しない。
【００１５】
【発明の実施の形態】
図１は、本発明の実施の形態の１例を示している。尚、本発明の特徴は、エンコーダ６ｂの内周縁に舌状部１９を形成すると共に、片側面（図１の右面）の内周縁寄り部分に凹入部２１を形成し、この舌状部１９の先端縁を、内輪４の外周面端縁部に形成した面取り２３の外径側に存在させ、この内輪４の端面から突出しない様にした点にある。その他の部分の構成及び作用は、前述の図２に示した従来構造、或は前述の図３に示した改良した構造と同様であるから、同等部分には同一符号を付して、重複する説明を省略若しくは簡略にし、以下、本発明の特徴部分、並びに上記先に述べた各構造と異なる部分を中心に説明する。
【００１６】
図１に示すエンコーダ付組み合わせシールリング１ｂは、従来構造と同様に、外輪２の内周面に内嵌固定されたシールリング３と、内輪４に外嵌固定されたスリンガ５と、このスリンガ５の回転円輪部１３の片側面に添着したエンコーダ６ｂとから成る。本発明の場合、前述の図３に示した改良した構造の様に、このエンコーダ６ｂの内周縁に、弾性変形した状態で上記内輪４の外周面のうち上記面取り２３を形成した部分から外れた部分に当接する舌状部１９を、全周に亙って形成している。即ち、この舌状部１９は、上記エンコーダ６ａと一体に形成されたゴム磁石製で、自由状態での内径は上記内輪４の外径よりも小さい。この為、このエンコーダ６ｂを添着した上記スリンガ５を内輪４に外嵌した場合に、上記舌状部１９は、弾性的に圧縮された状態で、この内輪４の外周面のうち上記面取り２３を形成した部分から外れた部分に、全周に亙って弾性的に当接する。
【００１７】
又、上記エンコーダ６ｂの軸方向（図１の左右方向）両側面のうちの上記回転円輪部１３と反対側面（図１の右側面）で、上記舌状部１９を形成した内周縁寄り部分に、他の部分よりも上記回転円輪部１３側に凹入した凹入部２１を、全周に亙って設けている。この凹入部２１の大きさは、上記舌状部１９が上記内輪の外周面との当接に基づいて弾性的に圧縮された状態での弾性変形量を考慮して決める。即ち、この舌状部１９が弾性変形した状態でも、この舌状部１９の先端部が上記内輪４の端面から軸方向（図１の右方）に突出しない様に、上記凹入部２１の大きさを定める。又、上記舌状部１９の先端縁を、上記内輪４の外周面端縁部に形成した面取り２３の外径側に存在させ、この内輪４の端面から突出しない様にしている。
【００１８】
尚、上記エンコーダ６ｂの外周縁部には、上記回転円輪部１３の外周縁を越えて回転円輪部１３のシールリップ１１ａが摺接する面にまで延長した係止部２２を形成している。これにより上記エンコーダ６ｂと上記スリンガ５との接合強度の向上を図っている。
【００１９】
上述の様に構成される本発明のエンコーダ付組み合わせシールリングを備えた転がり軸受ユニットは、前述した従来構造及び改良した構造の場合と同様に、自動車の車輪を支持する。又、エンコーダ付組み合わせシールリング１ｂにより、内輪４と外輪２との間で玉１５が存在する空間１７に異物が侵入する事を防止すると共に、上記車輪の回転速度を検出自在とする。
特に、本発明の場合、十分なシール性能を確保しつつ、上記エンコーダ６ｂの一部が上記内輪４の端面から軸方向に突出しない様にできる。即ち、上記エンコーダ６ｂの内周縁に形成した舌状部１９が上記内輪４の端部外周面との当接に基づいて弾性変形した状態で、この舌状部１９が上記内輪４の外周面のうち上記面取り２３を形成した部分から外れた部分に、全周に亙って弾性的に当接する事により、上記エンコーダ６ｂの内周縁と前記内輪４との間を全周に亙ってシールする。そして、この内輪４の外周面と上記スリンガ５の回転円筒部１２の内周面との当接部である嵌合面から、上記空間１７内に雨水等が進入するのを防止する。又、上記エンコーダ６ｂの上記回転円輪部１３と反対側面で上記舌状部１９を形成した内周縁寄り部分に、他の部分よりも上記回転円輪部１３側に凹入した凹入部２１を設けている為、上記舌状部１９が上記内輪４の外周面に当接して弾性変形しても、上記凹入部２１の存在により上記舌状部１９の弾性変形部分が、図１に鎖線で示す様にこの凹入部２１内に留まり、上記舌状部１９が、上記エンコーダ６ｂの本体部分の側面及び内輪４の端面から軸方向に突出しない。従って、搬送時等にも、このエンコーダ６ｂが他の部材と干渉しにくい。
【００２０】
尚、本例の場合、転動体として玉１５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、この玉１５に代えてテーパころを使用する場合もある。
【００２１】
【発明の効果】
本発明のエンコーダ付組み合わせシールリングを備えた転がり軸受ユニットは、以上に述べた通り構成され作用する為、優れたシール性を有し、しかも、搬送時等にエンコーダが他の部材と干渉して、破損する事がない。
【図面の簡単な説明】
【図１】 本発明の実施の形態の１例を示す部分拡大断面図。
【図２】 従来構造の１例を示す部分拡大断面図。
【図３】 この従来構造を改良した構造を示す部分拡大断面図。
【符号の説明】
１、１ａ、１ｂ エンコーダ付組み合わせシールリング
２ 外輪
３ シールリング
４ 内輪
５ スリンガ
６、６ａ、６ｂ エンコーダ
７ 芯金
８ 弾性変形
９ 固定円筒部
１０ 固定円輪部
１１ａ、１１ｂ、１１ｃ シールリップ
１２ 回転円筒部
１３ 回転円輪部
１４ 曲面部
１５ 玉
１６ 保持器
１７ 空間
１８ 隙間
１９ 舌状部
２０ 突出部
２１ 凹入部
２２ 係止部
２３ 面取り [0001]
BACKGROUND OF THE INVENTION
A rolling bearing unit including a combined seal ring with an encoder according to the present invention supports a wheel of an automobile so as to be rotatable with respect to a suspension device . The rolling bearing unit is hermetically sealed by a combined seal ring with an encoder, and the rotational speed of the wheel supported by the rolling bearing unit is detected.
[0002]
[Prior art]
Conventionally, in order to detect the rotational speed of an automobile wheel to detect the rotational speed of the wheel in order to support the wheel of the automobile rotatably with respect to the suspension system and to control the anti-lock brake system (ABS) and the traction control system (TCS), for example, A rolling bearing unit with an encoder as described in Japanese Utility Model Laid-Open No. 64-21219 is known. In addition, a structure in which an encoder is assembled to a part of a seal ring that closes an end opening of a rolling bearing unit is disclosed in, for example, Japanese Patent Laid-Open Nos. 5-26233, 5-238369, 6-281018, and 9-274051. No. 11-44702, European Patent Publication EP 0 495 323 A1, and the like are conventionally known.
[0003]
When the rotational speed of a wheel is detected magnetically, an encoder whose magnetic characteristics change alternately (generally at regular intervals) in the circumferential direction is used as the encoder. In this way, as an encoder whose magnetic characteristics alternately change in the circumferential direction, a magnetic material is formed by alternately forming a number of thinned portions and solid portions in the circumferential direction, or S pole and N pole. Permanent magnets arranged alternately are used. Of these, encoders made of permanent magnets are increasingly used in recent years from the viewpoint of simply configuring the sensor-side structure and ensuring detection accuracy at low speeds.
[0004]
FIG. 2 shows an example of a conventional structure of a rolling bearing unit provided with a combined seal ring with an encoder using such a permanent magnet encoder. This combination seal ring 1 with an encoder is made of a seal ring 3 that is fitted and fixed to an end of an outer ring 2 that is a fixed ring, and a magnetic metal plate such as a steel plate or a stainless steel plate, and is an end of an inner ring 4 that is a rotating wheel. A slinger 5 that is externally fixed to the slinger, and an encoder 6 that is supported and fixed to the slinger 5.
[0005]
Among these, the seal ring 3 is composed of a core metal 7 having an L-shaped cross section and an annular shape as a whole, and an elastic material 8. Of these, the metal core 7 is formed of a metal plate such as a mild steel plate and is formed in an annular shape as a whole with an L-shaped cross section, and is a fixed cylindrical portion that is fitted and fixed to the inner peripheral surface of the end portion of the outer ring 2 by an interference fit. 9 and a fixed annular portion 10 that is bent inward in the diametrical direction from the axial end (left-right direction in FIG. 2) edge of the fixed cylindrical portion 9 toward the outer peripheral surface of the inner ring 4. The elastic member 8 is attached over the entire circumference of the core bar 7 and has one to a plurality of (three in the illustrated example) seal lips 11a to 11c. In general, the elastic material 8 is made of rubber and is bonded to the core metal 7 by baking.
[0006]
On the other hand, the slinger 5 is connected to the inner peripheral surface of the outer ring 2 from the rotating cylindrical portion 12 that is fitted and fixed to the outer peripheral surface of the end portion of the inner ring 4 by an interference fit and the axial edge of the rotating cylindrical portion 12. And a rotating circular ring portion 13 bent in the diameter direction. Further, the slinger 5 does not include an elastic material, and smoothes the portions where the outer peripheral surface of the rotating cylindrical portion 12 and the one side surface of the rotating annular portion 13 are in sliding contact with the tip edges of the seal lips 11a to 11c. It is a surface.
[0007]
The encoder 6 is made of a rubber magnet in which S poles and N poles are alternately arranged in the circumferential direction. That is, the encoder 6 is formed by forming a rubber magnet in which ferrite powder is mixed in rubber in an annular shape, and is magnetized in the axial direction. The magnetization direction is changed alternately and at equal intervals over the circumferential direction. Therefore, S poles and N poles are alternately arranged at equal intervals on the side surface of the encoder 6 in the circumferential direction. Such an encoder 6 is attached and supported on the side surface of the rotating ring portion 13 which is located on the opposite side of the seal lips 11a to 11c. The encoder 6 has an inner peripheral edge extending to a curved surface portion 14 where the rotating cylindrical portion 12 and the rotating ring portion 13 of the slinger 5 are continuous. Thereby, the joint strength between the encoder 6 and the slinger 5 is improved.
[0008]
The rolling bearing unit incorporating the combined seal ring 1 with an encoder configured as described above supports and fixes the outer ring 2 which is a fixed ring with respect to a suspension device of an automobile, and the wheel is mounted on a hub which forms a rotating wheel together with the inner ring 4. Is fixed. A plurality of balls 15 are provided between the inner ring 4 and the outer peripheral surface of the hub and the inner peripheral surface of the outer ring 2 so as to be able to roll in a state of being held by a cage 16, and the inner ring 4 and the hub. The outer ring 2 can be freely rotated.
[0009]
Further, the open end of the space 17 that exists between the inner peripheral surface and the inner ring 4 and the outer peripheral surface of the hub of the outer ring 2, by plugging in combination seal ring 1 with the encoder, dust and the space 17 In addition to preventing foreign matter such as rainwater from entering, grease existing in the space 17 is prevented from leaking to the outside. That is, the fixed cylindrical portion 8 is fitted and fixed to the end portion of the outer ring 2, and the rotating cylindrical portion 12 is fixed to the end portion of the inner ring 4 by interference fitting. In this state, the seal ring 3 is fixed. The sliding edges of the sealing lips 11a to 11c are configured to be in sliding contact with the outer peripheral surface of the rotating cylindrical portion 12 and the side surface of the rotating annular portion 13, thereby closing the opening end of the space 17. The other open end (not shown) of the space 17 is closed with a combination seal ring that does not include an encoder. Further, the surface of the encoder 6 opposite to the rotating ring portion 13 is opposed to a rotation speed detector (not shown) so that the rotation speed of the wheel fixed to the hub constituting the rotating wheel together with the inner ring 4 can be detected. To do. The side surface of the encoder 6 and the end surface of the inner ring 4 are generally positioned on the same plane. This is because the encoder 6 is prevented from being easily damaged by protruding from the end surface of the inner ring 4, and the side surface of the encoder 6 is retracted from the end surface of the inner ring 4. This is to prevent the side surface and the detection unit of the sensor from becoming close to each other.
[0010]
In the case of the rolling bearing unit provided with the combination seal ring with the encoder of the first example of the conventional structure described above, the entry of relatively large foreign matters such as dust can be prevented, but it is not sufficient to prevent the entry of rainwater, muddy water, etc. is there. This is because a gap 18 exists between the inner peripheral edge of the encoder 6 and the outer peripheral surface of the inner ring 4 as shown in FIG. When rainwater or the like enters from the gap 18, there is a possibility that the rainwater or the like enters the space 17 from a slight gap in the fitting portion between the rotating cylindrical portion 12 and the inner ring 4 constituting the encoder 5. In other words, the rotary cylindrical portion 12 is externally fitted to the outer peripheral surface of the inner ring 4 by an interference fit, but the fitting surface is a metal-to-metal contact, and a perfect circle between the inner peripheral surface of the rotary cylindrical portion 12 and the outer peripheral surface of the inner ring 4 Depending on the accuracy such as degree and surface roughness, a slight gap is generated between the fitting surfaces. When the pressure in the space 17 is lower than the external pressure (for example, due to a temperature change), there is a possibility that rainwater or the like that has entered through the gap 18 is sucked into the space 17. When moisture enters the space 17, the raceways of the inner ring 4 and the outer ring 2 and the rolling surfaces of the balls 15 are rusted, leading to a decrease in performance and life of the rolling bearing unit.
[0011]
In order to prevent the rain water or the like from entering the space 17 as described above, it is conceivable to use a combined seal ring 1a with an encoder as shown in FIG. In this improved structure, a tongue-like portion 19 is formed on the inner periphery of the encoder 6a over the entire periphery. In a state where the rotating cylindrical portion 12 provided on the slinger 5 is externally fitted to the end portion of the inner ring 4, the tongue-shaped portion 19 abuts on the outer peripheral surface of the inner ring 4 while being elastically compressed. That is, the inner diameter of the tongue portion 19 in the free state is smaller than the outer diameter of the inner ring 4, and when the rotating cylindrical portion 12 of the slinger 5 with the encoder 6 a attached to the rotating ring portion 13 is externally fitted to the inner ring 4. The tongue portion 19 abuts on the outer peripheral surface of the inner ring 4 in an elastically deformed state. In this improved structure, the tongue-shaped portion 19 is in elastic contact with the outer peripheral surface of the inner ring 4 over the entire periphery, thereby sealing the fitting portion between the rotating cylindrical portion 12 and the inner ring 4. As a result, rainwater or the like can be sufficiently prevented from entering the space 17 through the fitting portion between the rotating cylindrical portion 12 and the inner ring 4.
[0012]
[Problems to be solved by the invention]
However, with the improved structure as described above, it is possible to prevent rainwater or the like from entering the space 17 by the tongue-shaped portion 19, but the tongue-shaped portion 19 is in contact with the outer peripheral surface of the inner ring 4 and is elastic. Along with the deformation, a part of the tongue-shaped portion 19 protrudes in the axial direction from the side surface of the main body portion of the encoder 5a and the end surface of the inner ring 4 as indicated by a chain line in FIG. The protruding portion 20 protruding from the end face of the inner ring 4 in this manner does not cause a functional problem such as rotational speed detection, but may interfere with other members during conveyance or the like, leading to damage to the encoder 6a. Is not preferable.
The rolling bearing unit provided with the combined seal ring with an encoder of the present invention has been invented in view of the above-described circumstances.
[0013]
[Means for solving the problems]
The rolling bearing unit provided with the combined seal ring with an encoder according to the present invention is capable of rolling between an outer ring that is a fixed ring, an inner ring that is a rotating ring, and an inner peripheral surface of the outer ring and an outer peripheral surface of the inner ring. A plurality of rolling elements provided, and a combination with an encoder used for closing the opening end of the space existing between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring and detecting the rotational speed of the inner ring A seal ring.
Further, a chamfer is formed on the edge of the inner ring on the opening end side of the space.
The combined seal ring with an encoder includes a seal ring fixed to the inner peripheral surface of the outer ring, a metal slinger fixed to the outer peripheral surface of the inner ring, and an encoder supported and fixed to the slinger. .
The seal ring includes a cored bar including a fixed cylindrical part fitted and fixed to the inner peripheral surface of the outer ring, a fixed ring part bent radially inward from an edge of the fixed cylindrical part, and the core And an elastic material having a seal lip attached over the entire circumference of the gold.
The slinger includes a rotating cylindrical portion that is fitted and fixed to the outer peripheral surface of the inner ring, and a rotating annular portion that is bent radially outward from an edge of the rotating cylindrical portion, and includes an elastic material. First, a portion of the outer peripheral surface of the rotating cylindrical portion and the one side surface of the rotating annular portion that is in sliding contact with the tip edge of the seal lip is a smooth surface, and of the rotating annular portion, The part excluding the continuous part is flat .
Further, the encoder is made of a rubber magnet in which S poles and N poles are alternately arranged in the circumferential direction, and is attached to a surface located on the side opposite to the seal lip on the side surface of the rotating annular portion. It is supported, and the thickness in the axial direction is constant except for the portion where the outer peripheral edge locking portion is formed and the portion where the inner peripheral edge-side recessed portion is formed .
In particular, in the case of the rolling bearing unit with an encoder with combination seal ring of the present invention, the inner peripheral edge of the encoder, the portion deviated from the portion formed with the chamfer of the outer circumferential surface of the inner ring in an elastically deformed state those A tongue-like portion that is in contact with each other is formed over the entire circumference, and the rotating annular portion is located closer to the inner peripheral edge of the side surface opposite to the rotating annular portion of both sides in the axial direction of the encoder than the other portions. The recessed part recessed in the side is provided over the perimeter.
Further, the tip edge of the tongue-like portion is present on the outer diameter side of the chamfer formed on the outer peripheral surface edge of the inner ring so as not to protrude from the end surface of the inner ring on the opening end side. Yes.
[0014]
[Action]
In the rolling bearing unit provided with the combined seal ring with an encoder of the present invention configured as described above, while preventing foreign matter from entering the space between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring, The function of preventing the grease filled in the space from leaking to the outside and the function of allowing the rotational speed of the inner ring to be detected include the above-described conventional structure or a combined seal ring with an encoder having an improved structure. This is the same as the case of the rolling bearing unit.
In particular, in the case of a rolling bearing unit provided with the combined seal ring with an encoder of the present invention, it is possible to prevent a part of the encoder from protruding from the end face of the inner ring while ensuring sufficient sealing performance. That is, the tongue portion formed on the inner peripheral edge of the encoder is in a state of being elastically compressed in a portion deviated from the portion forming a chamfer of the outer circumferential surface of the inner ring, it abuts over the entire circumference Accordingly, between the inner peripheral edge and the inner ring of the encoder and the seal over the entire periphery. Then, rainwater and the like are prevented from entering the space from the fitting surface between the inner ring and the rotating cylindrical portion. Further, of the both sides in the axial direction of the encoder, a recessed portion that is recessed closer to the rotating ring part than the other part is formed on the side near the periphery where the tongue-shaped part is formed on the side opposite to the rotating ring part. , the chamfered outer circumference edge portion of the inner ring, because they respectively, be elastically deformed the tongues in contact with the outer peripheral surface of the inner ring, the tongue by the presence of the recessed portion The elastically deformed portion remains in the recessed portion, and the tongue portion does not protrude from the end face of the inner ring.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an example of an embodiment of the present invention. The feature of the present invention is that a tongue-shaped portion 19 is formed on the inner peripheral edge of the encoder 6b, and a recessed portion 21 is formed on a portion near the inner peripheral edge of one side surface (the right surface in FIG. 1). The tip edge is located on the outer diameter side of the chamfer 23 formed on the edge of the outer peripheral surface of the inner ring 4, so that it does not protrude from the end surface of the inner ring 4 . Since the structure and operation of other parts are the same as those of the conventional structure shown in FIG. 2 or the improved structure shown in FIG. 3, the same parts are denoted by the same reference numerals and overlapped. The description will be omitted or simplified, and the following description will focus on the features of the present invention and portions that are different from the above-described structures.
[0016]
A combined seal ring 1b with an encoder shown in FIG. 1 includes a seal ring 3 that is fitted and fixed to the inner peripheral surface of the outer ring 2, a slinger 5 that is fitted and fixed to the inner ring 4, and the slinger 5 And an encoder 6b attached to one side surface of the rotating ring portion 13. In the case of the present invention, like the improved structure shown in FIG. 3 described above, the inner peripheral edge of the encoder 6b is elastically deformed and is removed from the portion where the chamfer 23 is formed on the outer peripheral surface of the inner ring 4 . A tongue-like portion 19 that is in contact with the portion is formed over the entire circumference. That is, the tongue portion 19 is made of a rubber magnet formed integrally with the encoder 6 a, and the inner diameter in the free state is smaller than the outer diameter of the inner ring 4. Therefore, when fitted to the slinger 5 was impregnated with this encoder 6b in the inner ring 4, the tongue 19 is in a state of being elastically compressed, the chamfer 23 of the outer peripheral surface of the inner ring 4 It elastically abuts over the entire circumference of the part that is out of the formed part .
[0017]
Further, the inner peripheral edge portion where the tongue-shaped portion 19 is formed on the opposite side surface (the right side surface in FIG. 1) of the encoder 6b in the axial direction (left and right direction in FIG. 1) of both side surfaces. In addition, a recessed portion 21 that is recessed toward the rotating ring portion 13 than the other portions is provided over the entire circumference. The size of the recessed portion 21 is determined in consideration of the amount of elastic deformation in a state in which the tongue portion 19 is elastically compressed based on contact with the outer peripheral surface of the inner ring. That is, even when the tongue-shaped portion 19 is elastically deformed, the size of the recessed portion 21 is such that the tip of the tongue-shaped portion 19 does not protrude in the axial direction (rightward in FIG. 1) from the end face of the inner ring 4. Determine the size. Further, the tip edge of the tongue-shaped portion 19 is present on the outer diameter side of the chamfer 23 formed on the outer peripheral surface edge of the inner ring 4 so as not to protrude from the end surface of the inner ring 4.
[0018]
The outer peripheral edge of the encoder 6b is formed with a locking portion 22 that extends beyond the outer peripheral edge of the rotating annular portion 13 to the surface where the seal lip 11a of the rotating annular portion 13 is in sliding contact. . Thereby, the joint strength between the encoder 6b and the slinger 5 is improved.
[0019]
The rolling bearing unit including the combined seal ring with an encoder of the present invention configured as described above supports the wheel of an automobile as in the case of the conventional structure and the improved structure described above. Further, the combined seal ring 1b with an encoder prevents foreign matter from entering the space 17 where the balls 15 exist between the inner ring 4 and the outer ring 2, and makes it possible to detect the rotational speed of the wheel.
In particular, in the case of the present invention, it is possible to prevent a part of the encoder 6b from protruding in the axial direction from the end face of the inner ring 4 while ensuring sufficient sealing performance. That is, the tongue-shaped portion 19 formed on the inner peripheral edge of the encoder 6b is elastically deformed based on the contact with the outer peripheral surface of the end of the inner ring 4, and the tongue-shaped portion 19 is formed on the outer peripheral surface of the inner ring 4 . Of these, the portion that is removed from the portion where the chamfer 23 is formed is elastically abutted over the entire circumference, thereby sealing between the inner periphery of the encoder 6b and the inner ring 4 over the entire periphery. . Then, rainwater or the like is prevented from entering the space 17 from a fitting surface which is a contact portion between the outer peripheral surface of the inner ring 4 and the inner peripheral surface of the rotating cylindrical portion 12 of the slinger 5. Further, a recessed portion 21 that is recessed closer to the inner side of the rotary ring portion 13 than the other portion is formed on the side of the encoder 6b on the side opposite to the rotary ring portion 13 where the tongue-shaped portion 19 is formed. because are provided, even if the tongue 19 is in contact with the elastic deformation on the outer peripheral surface of the inner ring 4, the elastic deformation portion of the tongue 19 by the presence of the recessed portion 21, a chain line in FIG. 1 As shown, it remains in the recessed portion 21, and the tongue portion 19 does not protrude in the axial direction from the side surface of the main body portion of the encoder 6b and the end surface of the inner ring 4. Therefore, the encoder 6b is unlikely to interfere with other members even during conveyance.
[0020]
In this example, the balls 15 are used as the rolling elements. However, in the case of a rolling bearing unit for automobiles that is heavy in weight, tapered rollers may be used instead of the balls 15 .
[0021]
【The invention's effect】
The rolling bearing unit provided with the combined seal ring with an encoder according to the present invention is configured and operates as described above, and thus has an excellent sealing property, and the encoder interferes with other members during transportation. No damage.
[Brief description of the drawings]
FIG. 1 is a partially enlarged sectional view showing an example of an embodiment of the present invention.
FIG. 2 is a partially enlarged sectional view showing an example of a conventional structure.
FIG. 3 is a partially enlarged sectional view showing a structure obtained by improving the conventional structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 1a, 1b Combination seal ring with encoder 2 Outer ring 3 Seal ring 4 Inner ring 5 Slinger 6, 6a, 6b Encoder 7 Core 8 Elastic deformation 9 Fixed cylindrical part 10 Fixed annular part 11a, 11b, 11c Seal lip 12 Rotating cylinder Part 13 Rotating ring part 14 Curved surface part 15 Ball 16 Cage 17 Space 18 Gap 19 Tongue part 20 Projection part 21 Recessed part 22 Locking part
23 Chamfering

Claims (1)

固定輪である外輪と、回転輪である内輪と、この外輪の内周面とこの内輪の外周面との間に転動自在に設けた複数の転動体と、この外輪の内周面とこの内輪の外周面との間に存在する空間の開口端部を塞ぐと共に、この内輪の回転速度を検出する為に使用するエンコーダ付組み合わせシールリングとを備えた、エンコーダ付組み合わせシールリングを備えた転がり軸受ユニットであって、
上記内輪の外周面のうちの上記空間の開口端部側の端縁部に、面取りを形成しており、
上記エンコーダ付組み合わせシールリングは、上記外輪の内周面に固定されるシールリングと、上記内輪の外周面に固定される金属製のスリンガと、このスリンガに支持固定されるエンコーダとを備え、
上記シールリングは、上記外輪の内周面に嵌合固定される固定円筒部及びこの固定円筒部の端縁から径方向内方に折れ曲がった固定円輪部から成る芯金と、この芯金の全周に亙って添着された、シールリップを有する弾性材とを備え、
上記スリンガは、上記内輪の外周面に嵌合固定される回転円筒部と、この回転円筒部の端縁から径方向外方に折れ曲がった回転円輪部とを備えて、弾性材を備えず、上記回転円筒部の外周面及び上記回転円輪部の片側面で上記シールリップの先端縁を摺接させる部分を平滑面とすると共に、この回転円輪部のうちで上記回転円筒部との連続部を除く部分を平板状としており、
上記エンコーダは、円周方向に亙ってＳ極とＮ極とを交互に配置したゴム磁石製で、上記回転円輪部の側面で上記シールリップとは反対側に位置する面に添着支持されていて、軸方向に関する厚さが、外周縁の係止部を形成した部分及び内周縁寄りの凹入部を形成した部分を除き一定であり、
上記エンコーダの内周縁に、弾性変形した状態で上記内輪の外周面のうち上記面取りを形成した部分から外れた部分に当接する舌状部を全周に亙って形成すると共に、上記エンコーダの軸方向両側面のうちの上記回転円輪部と反対側面の内周縁寄り部分に、他の部分よりも上記回転円輪部側に凹入した上記凹入部を全周に亙って設けており、
上記舌状部の先端縁は、上記内輪の外周面端縁部に形成した上記面取りの外径側に存在し、この内輪の上記空間の開口端部側の端面から突出しない事を特徴とするエンコーダ付組み合わせシールリングを備えた転がり軸受ユニット。An outer ring that is a fixed ring, an inner ring that is a rotating ring, a plurality of rolling elements provided between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring, the inner peripheral surface of the outer ring and the inner ring Rolling with a combined seal ring with an encoder that closes the open end of the space that exists between the outer ring and the inner ring and that has a combined seal ring with an encoder that is used to detect the rotational speed of the inner ring A bearing unit,
A chamfer is formed at the edge of the outer ring of the inner ring on the opening end side of the space,
The combined seal ring with an encoder includes a seal ring fixed to the inner peripheral surface of the outer ring, a metal slinger fixed to the outer peripheral surface of the inner ring, and an encoder supported and fixed to the slinger.
The seal ring includes a fixed cylindrical portion that is fitted and fixed to the inner peripheral surface of the outer ring, a fixed metal portion that is bent radially inward from an edge of the fixed cylindrical portion, An elastic material having a seal lip attached to the entire circumference,
The slinger includes a rotating cylindrical portion that is fitted and fixed to the outer peripheral surface of the inner ring, and a rotating annular portion that is bent radially outward from an edge of the rotating cylindrical portion, and does not include an elastic material. A portion where the tip edge of the seal lip is slidably contacted on the outer peripheral surface of the rotating cylindrical portion and one side surface of the rotating annular portion is a smooth surface, and the rotation annular portion is continuous with the rotating cylindrical portion. The part excluding the part is flat ,
The encoder is made of a rubber magnet in which S poles and N poles are alternately arranged in the circumferential direction, and is attached to and supported by a surface located on the side opposite to the seal lip on the side surface of the rotating ring portion. And the thickness in the axial direction is constant except for the portion where the outer peripheral engaging portion is formed and the portion where the inner peripheral peripheral recess is formed,
The inner peripheral edge of the encoder, so as to form across the tongues abutting the entire circumference at a portion deviated from the portion formed with the chamfer of the outer circumferential surface of the inner ring in an elastically deformed state, of the encoder shaft the inner peripheral edge portion close to the opposite side the rotating annular portion of the opposite sides surfaces, which are provided over the concave portion was also recessed in the rotating annular portion side than the other portion in the entire circumference,
A tip edge of the tongue-like portion is present on the outer diameter side of the chamfer formed on the outer peripheral surface edge of the inner ring, and does not protrude from the end surface on the opening end side of the space of the inner ring. Rolling bearing unit with combined seal ring with encoder.
JP2001138350A 2001-05-09 2001-05-09 Rolling bearing unit with combination seal ring with encoder Expired - Fee Related JP4604388B2 (en)

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JP4582775B2 (en) * 2004-10-28 2010-11-17 Ｎｔｎ株式会社 Wheel bearing device
JP2009127668A (en) * 2007-11-20 2009-06-11 Koyo Sealing Techno Co Ltd Hermetically sealing device
JP2010261598A (en) * 2010-08-24 2010-11-18 Nsk Ltd Sealing device and rolling bearing unit with sealing device
JP5853563B2 (en) * 2011-10-05 2016-02-09 日本精工株式会社 Manufacturing method of hub unit with encoder and combination seal ring
JP6036215B2 (en) * 2011-11-29 2016-11-30 日本精工株式会社 Rolling bearing unit with combination seal ring
ITTO20130802A1 (en) * 2013-10-03 2015-04-04 Skf Ab DRIP HOLDING DEVICE, IN PARTICULAR FOR ROLLING BEARINGS
ITTO20130799A1 (en) * 2013-10-03 2015-04-04 Skf Ab LOW FRICTION SEALING COMPLEX, IN PARTICULAR FOR ROLLING BEARINGS
ITTO20130800A1 (en) * 2013-10-03 2015-04-04 Skf Ab SEALING UNIT, IN PARTICULAR FOR ROLLING BEARINGS
JP7308963B2 (en) 2019-09-24 2023-07-14 Nok株式会社 sealing device
US12013038B2 (en) 2020-06-12 2024-06-18 Nok Corporation Sealing device

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JPH06281018A (en) * 1993-01-19 1994-10-07 Snr Roulements Coder built-in sealing structure
JPH11304827A (en) * 1998-04-22 1999-11-05 Nippon Seiko Kk Rolling bearing unit with encoder

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JPH06281018A (en) * 1993-01-19 1994-10-07 Snr Roulements Coder built-in sealing structure
JPH11304827A (en) * 1998-04-22 1999-11-05 Nippon Seiko Kk Rolling bearing unit with encoder

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