JP3663866B2

JP3663866B2 - Rolling bearing unit with rotational speed detector

Info

Publication number: JP3663866B2
Application number: JP35332497A
Authority: JP
Inventors: 英男大内
Original assignee: NSK Ltd
Current assignee: NSK Ltd
Priority date: 1997-12-22
Filing date: 1997-12-22
Publication date: 2005-06-22
Anticipated expiration: 2017-12-22
Also published as: JPH11183491A

Description

【０００１】
【発明の属する技術分野】
この発明に係る回転速度検出装置付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と共に、この車輪の回転速度を検出する為に利用する。
【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のに、転がり軸受ユニットを使用する。又、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）を制御する為には、上記車輪の回転速度を検出する必要がある。この為、上記転がり軸受ユニットに回転速度検出装置を組み込んだ回転速度検出装置付転がり軸受ユニットにより、上記車輪を懸架装置に対して回転自在に支持すると共に、この車輪の回転速度を検出する事が、近年広く行なわれる様になっている。
【０００３】
図４〜５は、この様な目的で使用される回転速度検出装置の従来構造の１例として、実開平７−３１５３９号公報に記載されたものを示している。この回転速度検出装置付転がり軸受ユニットは、使用時にも回転しない外輪相当部材である外輪１の内側に、使用時に回転する内輪相当部材を構成するハブ２を回転自在に支持している。そして、このハブ２の一部に固定したエンコーダ３の回転速度を、上記外輪１に支持したセンサユニット４により検出自在としている。即ち、上記外輪１の内周面には、複列の第一、第二の外輪軌道５ａ、５ｂを設けている。又、上記ハブ２の中間部外周面、及びこのハブ２の、請求項に記載した他端部である、内端部（自動車への組み付け状態で幅方向中央側となる端部を言い、図１〜３の右端部、図４の左端部）に形成した段部７４に外嵌してナット６によりこのハブ２に対し結合固定した状態で、上記内輪相当部材を構成する内輪７の外周面には、それぞれ第一、第二の内輪軌道８ａ、８ｂを設けている。そして、これら各内輪軌道８ａ、８ｂと上記各外輪軌道５ａ、５ｂとの間にそれぞれ複数個ずつの転動体９、９を、それぞれ保持器１０、１０により保持した状態で転動自在に設け、上記外輪１の内側に上記ハブ２及び内輪７を、回転自在に支持している。
【０００４】
又、上記ハブ２の、請求項に記載した一端部である、外端部（自動車への組み付け状態で幅方向外側となる端部を言い、図１〜３の左端部、図４の右端部）で上記外輪１の外端部から軸方向外方に突出した部分には、車輪を取り付ける為の第一のフランジ１１を設けている。又、上記外輪１の内端部には、この外輪１を懸架装置に取り付ける為の、請求項１、２に記載した第二のフランジである、取付部１２を設けている。又、上記外輪１の外端開口部と上記ハブ２の中間部外周面との間の隙間は、シールリング１３により塞いでいる。尚、重量の嵩む自動車用の転がり軸受ユニットの場合には、上記複数個の転動体９、９として、図示の様な玉に代えて、テーパころを使用する場合もある。
【０００５】
上述の様な転がり軸受ユニットに回転速度検出装置を組み込むべく、上記内輪７の内端部で上記内輪軌道８から外れた部分の外周面には、前記エンコーダ３を外嵌固定している。このエンコーダ３は、軟鋼板等の磁性金属板に塑性加工を施す事により、断面Ｌ字形で全体を円環状に形成したもので、円筒部１４と円輪部１５とを備え、このうちの円筒部１４を上記内輪７の内端部に締まり嵌めで外嵌固定している。又、上記円輪部１５には、それぞれがこの円輪部１５の直径方向に長いスリット状の透孔１６、１６を多数、放射状に、円周方向に亙り等間隔で形成する事により、上記円輪部１５の磁気特性を、円周方向に亙って交互に且つ等間隔で変化させている。
【０００６】
更に、上記外輪１の内端開口部にはカバー１７を、上記エンコーダ３の円輪部１５の内側面に対向する状態で、嵌合固定している。金属板を塑性加工して成る、このカバー１７は、上記外輪１の内端開口部に内嵌固定自在な嵌合筒部１８と、この内端開口部を塞ぐ塞ぎ板部１９とを有する。この塞ぎ板部１９の中央部には、有底円筒状の膨出部２０を形成して、この塞ぎ板部１９と前記ナット６との干渉を防止している。又、この塞ぎ板部１９の外周寄り部分で、この膨出部２０よりも直径方向外側部分には透孔２１を形成し、この透孔２１を通じて上記センサユニット４の検知部２２を、上記カバー１７の内側に挿入している。又、上記センサユニット４の中間部外周面には取付フランジ２３を固設しており、この取付フランジ２３を上記カバー１７の塞ぎ板部１９に、止めねじ２４、２４で固定する事により、上記センサユニット４を上記カバー１７に、所定の位置関係で結合固定している。この様にセンサユニット４をカバー１７に結合固定した状態で、上記検知部２２の先端面は、上記エンコーダ３を構成する円輪部１５の内側面に、微小隙間を介して対向する。
【０００７】
上述の様な回転速度検出装置付転がり軸受ユニットの使用時には、前記外輪１の外周面に固設した取付部１２を懸架装置に対して、図示しないボルトにより結合固定すると共に、前記ハブ２の外周面に固設したフランジ１１に車輪を、このフランジ１１に設けたスタッド２５により固定する事で、上記懸架装置に対して上記車輪を回転自在に支持する。この状態で車輪が回転すると、上記センサユニット４の検知部２２の端面近傍を、上記円輪部１５に形成した透孔１６、１６と、円周方向に隣り合う透孔１６、１６同士の間に存在する柱部とが交互に通過する。この結果、上記センサユニット４内を流れる磁束の密度が変化し、このセンサユニット４の出力が変化する。この様にしてセンサユニット４の出力が変化する周波数は、上記車輪の回転数に比例する。従って、上記センサユニット４の出力を図示しない制御器に送れば、ＡＢＳやＴＣＳを適切に制御できる。
【０００８】
【先発明の説明】
又、特願平９−１９６９７４号には、センサをカバーに着脱する作業を容易且つ迅速に行なえて、コスト低減を図れる構造が開示されている。図６〜１０は、この先発明に係る構造の１例を示している。外輪１の、請求項に記載した他端部である、内端（図６の右端）開口部は、カバー１７ａにより塞いでいる。このカバー１７ａは、合成樹脂を射出成形して成る有底円筒状の本体２６と、この本体２６の開口部に結合した嵌合筒２７とから成る。この嵌合筒２７は、ステンレス鋼板等の耐食性を有する金属板を塑性変形させて成るもので、断面Ｌ字形で全体を円環状とし、嵌合筒部２８と、この嵌合筒部２８の基端縁（図６の右端縁）から直径方向内方に折れ曲がった内向鍔部２９とを備える。この様な嵌合筒２７は、この内向鍔部２９を上記本体２６の射出成形時にモールドする事により、この本体２６の開口部に結合している。尚、上記内向鍔部２９には、多数の小孔３０、３０を、円周方向に亙って間欠的に形成している。これら各小孔３０、３０の内側には上記本体２６を構成する合成樹脂が、この本体２６の射出成形時に流入して、この本体２６と上記嵌合筒２７との結合強度を高める。
【０００９】
上述の様に構成するカバー１７ａは、上記嵌合筒２７の嵌合筒部２８を上記外輪１の内端部に、締まり嵌めで外嵌固定する事により、この外輪１の内端開口部を塞いでいる。又、この状態で上記本体２６の開口部端面、即ち、この本体２６の外周縁部に形成した円筒壁部３１の先端面は、上記外輪１の内端面に当接させる。上記円筒壁部３１の先端面には全周に亙って係止溝を形成すると共に、この係止溝内にＯリング３２を係止している。上記円筒壁部３１の先端面と上記外輪１の内端面とを当接させた状態では、上記Ｏリング３２がこの内端面と上記係止溝の底面との間で弾性的に圧縮されて、上記カバー１７ａと外輪１との結合部をシールし、泥水等の異物が上記カバー１７ａ内に進入するのを防止する。
【００１０】
一方、ハブ２と共に内輪相当部材を構成する内輪７の内端部（図６の右端部）には、エンコーダ３ａを外嵌固定している。このエンコーダ３ａは、支持環３３と永久磁石３４とから成る。このうちの支持環３３は、ＳＰＣＣ、ＳＰＣＤ、ＳＰＣＥ等の磁性金属板を折り曲げる事により、断面Ｌ字形で全体を円環状に形成し、上記内輪７の内端部に締まり嵌めで外嵌固定している。又、上記永久磁石３４は、例えばフェライト粉末を混入したゴムを上記支持環３３を構成する円輪部の内側面に、焼き付け等により添着して成る。この永久磁石３４は、例えば軸方向（図６の左右方向）に亙って着磁すると共に、着磁方向を円周方向に亙り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３ａの内側面には、Ｓ極とＮ極とが円周方向に亙り交互に且つ等間隔で配置されている。
【００１１】
又、上記カバー１７ａを構成する本体２６の底板部３５の一部で上記エンコーダ３ａを構成する永久磁石３４の内側面と対向する部分には、挿入孔３６を、上記底板部３５を貫通させる状態で、上記外輪１の軸方向に亙り形成している。そして、この挿入孔３６内に、センサユニット３７の先端寄り部分を挿入している。このセンサユニット３７は、ホール素子、磁気抵抗素子（ＭＲ素子）等、磁束の流れ方向に応じて特性を変化させる磁気検出素子並びにこの磁気検出素子の出力波形を整える為の波形整形回路を組み込んだＩＣと、上記永久磁石３４から出る（或は上記永久磁石３４に流れ込む）磁束を上記磁気検出素子に導く為の、磁性材製のポールピース等とから成るセンサを、合成樹脂中に包埋して成る。又、上記ＩＣから整形された波形として出る出力信号を図示しない制御器に送る為のハーネス３８の端部を、上記センサユニット３７に接続している。
【００１２】
この様なセンサユニット３７は、先端（図６の左端）寄り部分に設けられ、上記挿入孔３６をがたつきなく挿通自在な円柱状の挿入部３９と、この挿入部３９の基端部（図６の右端部）に形成した、外向フランジ状の鍔部４０とを備える。上記挿入部３９の中間部外周面には係止溝を形成すると共に、この係止溝にＯリング４１を係止している。上記挿入部３９を上記挿入孔３６に挿通した状態では、上記Ｏリング４１がこの挿入孔３６の内周面と上記係止溝の底面との間で弾性的に圧縮されて、上記挿入部３９の外周面と上記挿入孔３６の内周面との間をシールする。即ち、上記Ｏリング４１は、泥水等の異物がこの挿入孔３６を通じて上記カバー１７ａ及び外輪１の内側に進入するのを防止する。この様に、前記Ｏリング３２により外輪１とカバー１７ａとの結合部を、上記Ｏリング４１によりこのカバー１７ａに対する上記センサユニット３７の挿通部を、それぞれシールして、転がり軸受ユニット中への異物混入防止を図り、この転がり軸受ユニットの耐久性を確保している。
【００１３】
一方、上記カバー１７ａを構成する前記底板部３５の外面（このカバー１７ａにより塞ぐべき、転動体９、９を設置した空間４２と反対側の側面で、図６の右側面）の一部で、上記挿入孔３６の開口周囲部分には、係止筒４３を設けている。この係止筒４３の内周面は、上記挿入孔３６の内周面と共に、単一円筒面を構成している。又、上記係止筒４３の外周面で直径方向反対側２個所位置には、それぞれ係止凹部４４、４４を設けている。これら各係止凹部４４、４４は、それぞれ次述する結合ばね４５を構成する線材の外径よりも十分に大きな幅を有する。そして、それぞれの片側面で上記係止筒４３の先端側（図６、９の右側）内側面に、断面円弧状の係止溝４６、４６を、上記各係止凹部４４、４４の全幅に亙って形成している。これら各係止溝４６、４６の断面の曲率半径は、上記結合ばね４５を構成する線材の外周面の曲率半径と同じか、これよりも僅かに大きくしている。
【００１４】
上記センサユニット３７の基端部に設けた、位置決め部として機能する前記鍔部４０は、上述の様に形成した係止筒４３の先端面（図６、９の右端面）に当接させ、次述する結合ばね４５により、上記係止筒４３に結合固定する。この結合ばね４５は、ステンレスのばね鋼、クロムメッキ若しくは亜鉛メッキを施したばね鋼等、弾性及び耐食性を有する線材を曲げ形成して成る。この結合ばね４５は、少なくとも上記係止筒４３への組み付け状態で互いに平行になる１対の係止脚部４７、４７と、上記鍔部４０を上記係止筒４３の先端面に向け抑え付ける為の抑え部４８と、この抑え部４８の両端部と上記各係止脚部４７、４７の基端部（図１０の右上端部）とを連結する為の、１対の連結部４９、４９とから成る。上記抑え部４８は、中間部にＵ字形の湾曲部５０を、両端部にこの湾曲部５０の両端から反対方向に折れ曲がった直線部５１、５１を、それぞれ有する。上記各連結部４９、４９の一端は、これら各直線部５１、５１の端部から同一方向に折れ曲がっている。
【００１５】
上述の様な結合ばね４５は、少なくとも使用状態では、上記１対の係止脚部４７、４７を含む平面と、上記抑え部４８を含む平面とが互いに平行になる。但し、上記結合ばね４５の自由状態ではこれら各平面同士の間隔が縮まる様に、上記各連結部４９、４９の一端と上記各係止脚部４７、４７の基端部との連続部の角度を小さくする方向の弾力を付与している。又、上記１対の係止脚部４７、４７の本体部分同士の自由状態での間隔Ｄ₄₇（図１０）は、前記係止凹部４４、４４同士の間隔Ｄ₄₄（図９）よりも少し小さく（Ｄ₄₇＜Ｄ₄₄）している。更に、上記１対の係止脚部４７、４７の先端部は、互いに逆方向に向け折り曲げて、これら両係止脚部４７、４７の先端部同士の間隔が、端部に向かう程大きくなる様にしている。
【００１６】
一方、前記センサユニット３７に設けた鍔部４０の基端面（挿入部３９と反対側の面で、図６の右端面、図８の手前面）には、上記結合ばね４５の抑え部４８をがたつきなく係合させる為の、抑え溝５２を形成している。この抑え溝５２は、前記ハーネス３８の基端部を囲む状態で設けた湾曲部５３と、この湾曲部５３の両端から互いに逆方向に折れ曲がり、上記鍔部４０の外周縁に開口した直線部５４、５４とから成る。又、上記鍔部４０の基端面の一部で、上記湾曲部５３の凸側に対向する部分には、傾斜面５５を形成している。この傾斜面５５は、上記鍔部４０の厚さが、この鍔部４０の端縁に向かう程小さくなる方向に傾斜している。
【００１７】
それぞれが上述の様に構成される各部材を組み合わせて、本発明の回転速度検出装置付転がり軸受ユニットを構成すべく、上記センサユニット３７を前記カバー１７ａに装着する作業は、次の様にして行なう。先ず、センサユニット３７の先端寄り部分である挿入部３９を、前記係止筒４３及び挿入孔３６に挿入し、鍔部４０を上記係止筒４３の先端面に当接させる。この状態で、上記センサユニット３７を構成する挿入部３９の先端面に設けた検出部と前記エンコーダ３ａを構成する永久磁石３４の内側面との間に、所望の厚さ寸法（例えば０．５mm程度）の微小隙間が存在する様に、各部の寸法を規制している。次いで、結合ばね４５を上記カバー１７ａに設けた上記係止筒４３と上記センサユニット３７との間に装着し、上記鍔部４０を上記係止筒４３の先端面に押圧する。
【００１８】
上述の様に、結合ばね４５を上記カバー１７ａに設けた上記係止筒４３と上記センサユニット３７との間に装着する作業は、上記結合ばね４５を構成する１対の係止脚部４７、４７を上記係止筒４３の係止凹部４４、４４に、これら係止脚部４７、４７の先端側から挿入する事により行なう。これら両係止脚部４７、４７の先端部同士の間隔は、端部に向かう程大きくなっている為、この挿入作業は容易に行なえる。この挿入作業の進行に伴い、前記抑え部４８の直線部５１、５１が上記鍔部４０に形成した前記傾斜面５５に乗り上げる。この状態から更に上記挿入作業を継続すれば、上記抑え部４８が上記鍔部４０の基端面に形成した抑え溝５２に係合する。尚、この挿入作業の際、前記１対の連結部４９、４９の一部で上記鍔部４０の外周縁に対向する部分が、この鍔部４０の外周縁と干渉しない様に、これら１対の連結部４９、４９の一部で上記抑え部４８に近い部分の間隔は、上記鍔部４０の外径よりも少し大きくしておく。
【００１９】
上述の様に、上記抑え部４８が抑え溝５２に係合した状態では、上記結合ばね４５が上記鍔部４０を上記係止筒４３の端面に向け、十分に大きな力（例えば１０kgf 程度）で押し付けて、上記センサユニット３７を上記カバー１７ａに結合する。又、この状態では、上記各係止脚部４７、４７と前記各係止溝４６、４６との係合、並びに上記抑え部４８と上記抑え溝５２との係合に基づき、上記結合ばね４５が上記センサユニット３７及び係止筒４３から不用意に外れる事がなくなる。この結果、上記センサユニット３７が、上記カバー１７ａから不用意に外れる事がなくなる。
【００２０】
上記センサユニット３７を上記カバー１７ａから取り外す際には、上述した装着作業とは逆に、先ず、上記結合ばね４５を上記カバー１７ａと上記センサユニット３７との間から取り外す。この取り外し作業は、先ず上記抑え部４８を上記鍔部４０の基端面から浮かせた後、上記１対の係止脚部４７、４７を上記係止凹部４４、４４から抜き取る事により行なう。この様にして上記結合ばね４５を取り外した後、上記センサユニット３７の挿入部３９を、前記挿入孔３６及び係止筒４３の内側から抜き取る。
【００２１】
上記結合ばね４５を、上記カバー１７ａに設けた係止筒４３と上記センサユニット３７との間に着脱する作業は、止めねじ２４、２４（図４〜５参照）を緊締したり弛めたりする作業に比べて容易且つ迅速に行なえる。従って、先発明によれば、上記センサユニット３７を上記カバー１７ａに着脱する作業に要する手間を軽減して、回転速度検出装置付転がり軸受ユニット自体のコスト、並びに修理に要するコストの低減を図れる。
【００２２】
【発明が解決しようとする課題】
前述の図４〜５に示した様な従来構造、並びに上述した様な先発明に係る構造の場合には、次に述べる様な点を改良する事が望まれている。
先ず、従来構造の場合には、外輪１とカバー１７との嵌合部、並びにこのカバー１７に形成した透孔２１の内周縁とセンサ４の外周面との間の隙間のシールを特に考慮していない。回転速度検出装置付転がり軸受ユニットには、雨天走行時に車輪が巻き上げた雨水や洗車時に高圧洗車機から噴出される洗浄水等が吹き付けられる。この様な雨水や洗浄水等が、外輪１の内周面とハブ２及び内輪７の外周面との間で転動体９、９を設置した空間内に入り込むと、この空間内に充填したグリースを劣化させたり、外輪、内輪両軌道５、６並びに上記各転動体９、９の転動面を錆びさせる原因になる。
【００２３】
これに対して、図６に示した先発明の場合には、カバー１７ａを構成する円筒壁部３１の先端面に係止したＯリング３２、並びにセンサユニット３７の挿入部３９の外周面に係止したＯリング４１により、外輪１の内周面とハブ２及び内輪７の外周面との間で転動体９、９を設置した空間内に雨水や洗浄水等が入り込むのを防止している。但し、この空間内に雨水や洗浄水等が入り込むのを防止する為に２本のＯリング３２、４１を使用している為、これら両Ｏリング３２、４１を係止する為の係止溝の加工作業が面倒になる事と相まって、シールの為のコストが嵩む事が避けられない。
本発明の回転速度検出装置付転がり軸受ユニットは、この様な事情に鑑み、外輪に固定したカバーに対してセンサを着脱自在に支持した構造で、転動体を設置した部分に雨水や洗浄水等が入り込むのを有効に防止できる、安価な構造を実現すべく考えたものである。
【００２４】
【課題を解決するための手段】
本発明の回転速度検出装置付転がり軸受ユニットのうち、請求項１に記載した回転速度検出装置付転がり軸受ユニットは、前述した従来或は先発明の回転速度検出装置付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、第二の外輪軌道と上記第一、第二の内輪軌道との間にそれぞれ複数個ずつ転動自在に設けられた転動体と、上記内輪の他端部外周面にこの内輪と同心に固定された、円周方向に亙る特性を交互に且つ等間隔に変化させたエンコーダと、このエンコーダに対向する状態で上記外輪の他端開口部に、この他端開口部を塞ぐ状態で固定されたカバーと、このカバーの一部で上記エンコーダと対向する部分に形成された挿入孔と、検知部を有し、この検知部をこのカバーの挿入孔に挿通させて上記エンコーダの一部に対向させた状態で上記カバーの一部に着脱自在に支持され、上記エンコーダの特性の変化に対応して出力信号を変化させる、上記カバーにがたつきなく軸方向に抑え付けられているセンサユニットとを備える。
特に、本発明の回転速度検出装置付転がり軸受ユニットのうち、請求項１に記載した回転速度検出装置付転がり軸受ユニットに於いては、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おり、且つ、上記カバーと上記外輪とにより他端を塞がれた空間の内側で、軸方向に関して上記エンコーダの被検知部と上記転動体との間に位置する、上記外輪の他端部にシールリングを支持固定すると共に、このシールリングを構成するシールリップを上記エンコーダの一部に、全周に亙り摺接させており、且つ、上記センサユニットが挿入部と鍔部とを有し、上記カバーのうちの軸方向に関して上記第一のフランジと反対側の他端側に最も位置する面に上記センサユニットの鍔部が当接し、このセンサユニットの軸方向の位置決めをしている。
更に、請求項２に記載した回転速度検出装置付転がり軸受ユニットは、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、第二の外輪軌道と上記第一、第二の内輪軌道との間にそれぞれ複数個ずつ転動自在に設けられた転動体と、上記内輪の他端部外周面にこの内輪と同心に固定された、円周方向に亙る特性を交互に且つ等間隔に変化させたエンコーダと、このエンコーダに対向する状態で上記外輪の他端開口部に固定された、底板部を有するカバーと、このカバーの一部で上記エンコーダと対向する部分に形成された挿入孔と、検知部を有し、この検知部をこのカバーの挿入孔に挿通させて上記エンコーダの一部に対向させた状態で上記カバーの一部に着脱自在に支持され、上記エンコーダの特性の変化に対応して出力信号を変化させる、上記カバーにがたつきなく軸方向に抑え付けられているセンサユニットとを備える。
特に、請求項２に記載した回転速度検出装置付転がり軸受ユニットに於いては、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おり、且つ、上記挿入孔が、上記カバーの底板部の一部で上記エンコーダに対向する部分に軸方向に設けられたものであり、軸方向に関して上記カバーの底板部よりも上記転動体側で、上記エンコーダの被検知部とこれら転動体との間に位置する部分に、これら転動体を設置した空間の内外を遮断する為のシールリングを設けており、且つ、上記センサユニットが挿入部と鍔部とを有し、上記カバーのうちの軸方向に関して上記第一のフランジと反対側の他端側に最も位置する面に上記センサユニットの鍔部が当接し、このセンサユニットの軸方向の位置決めをしている。
【００２５】
【作用】
上述の様に構成する本発明の回転速度検出装置付転がり軸受ユニットにより、懸架装置に対して車輪を回転自在に支持すると共に、この車輪の回転速度を検出する際の作用は、前述した従来或は先発明の回転速度検出装置付転がり軸受ユニットと同様である。
特に、本発明の回転速度検出装置付転がり軸受ユニットの場合には、１個のシールリングにより、外輪軌道と内輪軌道との間で複数の転動体を設置した空間内に雨水や洗浄水等が入り込む事を防止できる。従って、この空間内に充填したグリースを劣化させたり、上記外輪、内輪両軌道並びに上記各転動体の転動面を錆びさせる事がなく、優れた耐久性を有する回転速度検出装置付転がり軸受ユニットのコスト低減を図れる。又、外輪の肉厚が小さくて端面の幅が狭く、Ｏリングの取付スペースを確保する事が難しい場合にも、十分なシール性確保を図れる。
【００２６】
【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、本発明の特徴の一つは、外輪１の内周面とハブ２ａ及び内輪７の外周面との間で転動体９、９を設置した空間内に、雨水や洗浄水等が入り込むのを防止する為の構造にある。その他の部分の構造及び作用は、多くの点で前述の図６〜１０に示した先発明の構造と同じであるから、同等部分には同一符号を付して重複する説明を省略し、以下、本発明の特徴部分、並びに先発明の構造と異なる部分に就いて説明する。
【００２７】
上記ハブ２ａと共に内輪相当部材を構成する内輪７の、請求項に記載した他端部である、内端部（図１〜２の右端部）に設けた肩部５６には、エンコーダ３ｂの基半部（図１〜２の左半部）を、締り嵌めにより外嵌固定している。このエンコーダ３ｂは、ＳＰＣＣ、ＳＰＣＤ、ＳＰＣＥ等の磁性金属板により断面クランク形で全体を略円筒状に形成したもので、互いに同心に形成された、基半側の小径部５７と先半側の大径部５８とを、段部５９により連続させている。このうちの大径部５８には、それぞれが軸方向（図１〜２の左右方向）に長い多数のスリット状の透孔６０、６０を、円周方向に亙って等間隔に形成している。
【００２８】
この様なエンコーダ３ｂの大径部５８は、上記小径部５７を上記肩部５６に外嵌固定した状態で、上記外輪１及び内輪７の内端面よりも内方に突出する。そして、上記大径部５８の外周面に、センサユニット３７ａを構成するセンサ４ａを、ラジアル方向に亙る微小隙間を介して対向させている。本例の場合にこのセンサ４ａは、ホール素子、磁気抵抗素子等、磁束の量に応じて特性を変化させる磁気検出素子並びにこの磁気検出素子の出力波形を整える為の波形整形回路を組み込んだＩＣと永久磁石とにより構成する。この様なセンサ４ａを組み込んだ上記センサユニット３７ａは、上記外輪１の内端開口部に固定したカバー１７ａに、前述の図６〜１０に示した先発明の構造と同様にして、着脱自在に支持している。但し、本発明の場合には、上記センサユニット３７ａには、先発明の場合の様なＯリング４１は装着していない。又、上記カバー１７ａを構成する円筒壁部３１の先端面にも、前述した先発明の構造の様なシール部材である、Ｏリング３２（図６）を係止してはいない。更に、上記センサユニット３７ａの検出部であり上記大径部５８の外周面に対向するセンサ４ａは、このセンサユニット３７ａの先端部内周面側に配置している。又、上記カバー１７ａのうちの軸方向に関して第一のフランジ１１と反対側の他端側である、内端側に最も位置する面に上記センサユニット３７ａの鍔部４０が当接し、このセンサユニット３７ａの軸方向の位置決めをしている。
【００２９】
一方、上記外輪１の内端部には、シールリング６１を内嵌固定している。このシールリング６１は、金属板を断面Ｌ字形に折り曲げて全体を円環状に形成した芯金６２と、ゴム、ビニル等の弾性材製で、この芯金６２の内周縁部に全周に亙って添着したシールリップ６３とにより構成している。そして、このシールリップ６３の先端縁を、上記エンコーダ３ｂを構成する小径部５７の外周面及び段部５９の外側面に、全周に亙って摺接させている。従って、上記外輪１の内周面と前記ハブ２ａ及び内輪７の外周面との間で転動体９、９を設置した空間６４の両端開口部のうち、内端開口部は、上記エンコーダ３ｂとシールリング６１とによりシールされる。この為、このシールリング６１は、軸方向に関して上記カバー１７ａの底板部３５よりも上記転動体９、９側で、軸方向に関して上記エンコーダ３ｂの被検知部である、大径部５８とこれら転動体９、９との間に位置する、この外輪１の内端部に支持固定される。又、上記シールリング６１は、軸方向に関して上記底板部３５よりも上記転動体９、９側で、上記エンコーダ３ｂの大径部５８と上記転動体９、９との間に位置する部分に設けられて、これら転動体９、９を設置した空間６４の内外を遮断する。尚、図示の例では、上記シールリップ６３の断面形状を二股に形成し、この二股部分の間にグリースを保持自在としている。このグリースは、上記シールリップ６３の先端縁と上記エンコーダ３ｂとの摺動部を潤滑し、この摺動部の抵抗の低減とシール性の向上とを図る。これに対して、上記空間６４の、請求項に記載した一端である、外端の開口部は、前述した従来構造及び先発明の構造と同様に、シールリング１３によりシールしている。
【００３０】
又、図示の例では、上記ハブ２ａに対し上記内輪７を結合固定する為に、このハブ２ａの内端部にかしめ部６５を形成している。即ち、このハブ２ａの内端部に形成した円筒部６６の先端部を、上記内輪７をハブ２ａの内端部に形成した段部７４に外嵌した後直径方向外方にかしめ広げて上記かしめ部６５とし、このかしめ部６５により上記内輪７を、上記ハブ２ａの外周面に形成した段差面６７に向け抑え付ける事により、上記ハブ２ａに対し上記内輪７を結合固定している。この様に構成する事により、ナット６（図４、６）を省略して部品点数の低減に基づく低廉化を図ると同時に、内輪相当部材の軸方向寸法を短縮して、この内輪相当部材を含む回転速度検出装置付転がり軸受ユニットの小型・軽量化を図れる。
【００３１】
上述の様に構成する本発明の回転速度検出装置付転がり軸受ユニットの場合には、上記１個のシールリング１３により、第一、第二の外輪軌道５ａ、５ｂと第一、第二の内輪軌道８ａ、８ｂとの間で複数の転動体９、９を設置した部分の空間６４内に、雨水や洗浄水等が入り込む事を防止できる。又、各部にＯリングを係止する為の係止溝を形成する手間も不要となる。従って、この空間６４内に充填したグリースを劣化させたり、上記外輪、内輪両軌道５ａ、５ｂ、８ａ、８ｂ並びに上記各転動体９、９の転動面を錆びさせる事がなく、優れた耐久性を有する回転速度検出装置付転がり軸受ユニットのコスト低減を図れる。
【００３２】
尚、上記シールリング６１と前記カバー１７ａとの間の空間６８内には、雨水や洗浄水が多少入り込む可能性がある。但し、この空間６８内に存在するエンコーダ３ｂ、センサ４ｂのうち、エンコーダ３ｂはステンレス鋼板やメッキ鋼板等の耐食性を有する金属板により造る事で、雨水や洗浄水の入り込みにより損傷を受ける事を防止できる。又、センサ４ｂは、前記センサユニット３７ａを構成する合成樹脂中に包埋しているので、やはり雨水や洗浄水の入り込みにより損傷を受ける事はない。しかも、上記空間６８内に入り込む雨水や洗浄水は僅かであり、この雨水や洗浄水が上記シールリング６１に向け吹き付けられる事もない。従って、このシールリング６１によるシール性能を特に高くしなくても、このシールリング６１を越えて上記転動体９、９を設置した部分の空間６４内に、雨水や洗浄水等が入り込む事を確実に防止できる。
【００３３】
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、エンコーダ３ｃを、支持環６９と永久磁石７０とにより構成している。このうちの支持環６９は、ＳＰＣＣ、ＳＰＣＤ、ＳＰＣＥ等の磁性金属板により断面クランク形で全体を略円筒状に形成したもので、互いに同心に形成された、基半側の大径部７１と先半側の小径部７２とを、段部７３により連続させている。又、上記永久磁石７０は、円筒状に形成されており、上記小径部７２の外周面に、全周に亙って支持固定している。ゴム磁石、プラスチック磁石等であるこの永久磁石７０は、直径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。従って上記永久磁石７０の外周面には、Ｎ極とＳ極とが交互に、且つ等間隔で配置されている。上記エンコーダ３ｃに永久磁石を利用した事に伴い、本例に使用するセンサ４ｂには、永久磁石は組み込んでいない。即ち、このセンサ４ｂは、ホール素子、磁気抵抗素子等、磁束の方向に応じて特性を変化させる磁気検出素子並びにこの磁気検出素子の出力波形を整える為の波形整形回路を組み込んだＩＣにより構成している。
【００３４】
上述の様なエンコーダ３ｃは、上記支持環６９を構成する大径部７１を内輪７の、請求項に記載した他端部である、内端部に設けた肩部５６に締り嵌めにより外嵌固定すると共に、上記段部７３を上記内輪７の内端面に突き当てている。一方、本例の場合も外輪１の内端部に、シールリング６１を内嵌固定している。そして、このシールリング６１を構成するシールリップ６３の先端縁を、上記エンコーダ３ｃを構成する大径部７１の外周面及び段部７３の内側面に、全周に亙って摺接させている。従って、上記外輪１の内周面とハブ２ａ及び内輪７の外周面との間で転動体９、９を設置した空間６４の両端開口部のうち、内端開口部は上記エンコーダ３ｃを構成する支持環６９とシールリング６１とによりシールされる。その他の構成及び作用は、前述した第１例の場合と同様である。
【００３５】
【発明の効果】
本発明の回転速度検出装置付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ので、センサの修理・交換に要するコストを低く抑える事ができ、しかも優れた耐久性を有する構造を、安価に実現できる。
【図面の簡単な説明】
【図１】本発明の実施の形態の第１例を示す断面図。
【図２】図１のＡ部拡大図。
【図３】本発明の実施の形態の第２例を示す断面図。
【図４】従来構造の１例を示す、図５のＢ−Ｏ−Ｃ断面図。
【図５】図４の左方から見た図。
【図６】先発明の実施の形態の１例を示す断面図。
【図７】カバーのみを取り出して示す斜視図。
【図８】ハーネスの端部及びセンサユニットのみを取り出して示す斜視図。
【図９】図６のＤ部を、カバーのみを取り出して示す断面図。
【図１０】センサユニットとカバーとを結合する為の結合ばねの斜視図。
【符号の説明】
１外輪
２、２ａハブ
３、３ａ、３ｂ、３ｃエンコーダ
４センサユニット
４ａ、４ｂセンサ
５ａ第一の外輪軌道
５ｂ第二の外輪軌道
６ナット
７内輪
８ａ第一の内輪軌道
８ｂ第二の内輪軌道
９転動体
１０保持器
１１第一のフランジ
１２取付部
１３シールリング
１４円筒部
１５円輪部
１６透孔
１７、１７ａカバー
１８嵌合筒部
１９塞ぎ板部
２０膨出部
２１透孔
２２検知部
２３取付フランジ
２４止めねじ
２５スタッド
２６本体
２７嵌合筒
２８嵌合筒部
２９内向鍔部
３０小孔
３１円筒壁部
３２Ｏリング
３３支持環
３４永久磁石
３５底板部
３６挿入孔
３７、３７ａセンサユニット
３８ハーネス
３９挿入部
４０鍔部
４１Ｏリング
４２空間
４３係止筒
４４係止凹部
４５結合ばね
４６係止溝
４７係止脚部
４８抑え部
４９連結部
５０湾曲部
５１直線部
５２抑え溝
５３湾曲部
５４直線部
５５傾斜面
５６肩部
５７小径部
５８大径部
５９段部
６０透孔
６１シールリング
６２芯金
６３シールリップ
６４空間
６５かしめ部
６６円筒部
６７段差面
６８空間
６９支持環
７０永久磁石
７１大径部
７２小径部
７３段部
７４段部 [0001]
BACKGROUND OF THE INVENTION
  The rolling bearing unit with a rotational speed detecting device according to the present invention supports the wheel of an automobile so as to be rotatable with respect to the suspension device, and is used for detecting the rotational speed of the wheel.
[0002]
[Prior art]
  A rolling bearing unit is used to rotatably support the wheels of the automobile with respect to the suspension system. Further, in order to control the anti-lock brake system (ABS) and the traction control system (TCS), it is necessary to detect the rotational speed of the wheel. For this reason, the rolling bearing unit with a rotational speed detection device incorporating the rotational speed detection device in the rolling bearing unit can support the wheel rotatably with respect to the suspension device and detect the rotational speed of the wheel. In recent years, it has been widely performed.
[0003]
  4-5 shows what was described in Japanese Utility Model Laid-Open No. 7-31539 as an example of a conventional structure of a rotational speed detecting device used for such a purpose. This rolling bearing unit with a rotational speed detection device rotatably supports a hub 2 that constitutes an inner ring equivalent member that rotates during use inside an outer ring 1 that is an outer ring equivalent member that does not rotate during use. And the sensor which supported the rotational speed of the encoder 3 fixed to a part of this hub 2 to the said outer ring | wheel 1unit4 makes detection possible. That is, the inner circumferential surface of the outer ring 1 has a double row.First, secondOuter ring raceway5a, 5bIs provided. Also, the hub 2Middle partOuter peripheral surface and this hub 2The other end portion of the claim is formed at the inner end portion (the end portion which is the center side in the width direction in the assembled state in the automobile, the right end portion in FIGS. 1 to 3 and the left end portion in FIG. 4). Stepped 74In a state of being fitted and fixed to the hub 2 with a nut 6,On the outer peripheral surface of the inner ring 7 constituting the inner ring equivalent member,First, secondInner ring raceway8a, 8bIs provided. And each of these inner ring raceways8a, 8bAnd each outer ring raceway5a, 5bA plurality of rolling elements 9, 9 are provided so as to be able to roll while being held by the cages 10, respectively, and the hub 2 and the inner ring 7 are rotatable inside the outer ring 1. I support it.
[0004]
  Also, the hub 2, One end of the claim,Outer end (refers to the end on the outer side in the width direction when assembled to the automobile,3 left end, figure4 on the right end of the outer ring 1 and projecting axially outward from the outer end of the outer ring 1.FirstA flange 11 is provided. In addition, the outer ring 1Inner edgeIn order to attach this outer ring 1 to the suspension systemThe second flange according to claim 1 or 2,A mounting portion 12 is provided. Further, a gap between the outer end opening of the outer ring 1 and the outer peripheral surface of the intermediate part of the hub 2 is closed by a seal ring 13. In the case of a rolling bearing unit for automobiles that is heavy, tapered rollers may be used as the plurality of rolling elements 9, 9, instead of balls as shown.
[0005]
  In order to incorporate the rotational speed detection device into the rolling bearing unit as described above, the encoder 3 is fitted and fixed to the outer peripheral surface of the inner end portion of the inner ring 7 which is away from the inner ring raceway 8. The encoder 3 is formed by subjecting a magnetic metal plate such as a mild steel plate to plastic working so as to be formed into an annular shape as a whole with an L-shaped cross section, and includes a cylindrical portion 14 and an annular portion 15. The portion 14 is externally fixed to the inner end portion of the inner ring 7 by an interference fit. Further, the annular portion 15 is formed with a plurality of slit-like through-holes 16, 16 that are long in the diameter direction of the annular portion 15, radially and at equal intervals in the circumferential direction. The magnetic characteristics of the annular portion 15 are changed alternately and at equal intervals over the circumferential direction.
[0006]
  Further, a cover 17 is fitted and fixed to the inner end opening of the outer ring 1 so as to face the inner surface of the annular portion 15 of the encoder 3. The cover 17 formed by plastic processing of a metal plate has a fitting tube portion 18 that can be fitted and fixed to the inner end opening of the outer ring 1 and a closing plate portion 19 that closes the inner end opening. A bottomed cylindrical bulged portion 20 is formed at the center of the closing plate portion 19 to prevent interference between the closing plate portion 19 and the nut 6. In addition, a through hole 21 is formed in a portion near the outer periphery of the closing plate portion 19 on the outer side in the diameter direction from the bulging portion 20, and the sensorunitThe four detection units 22 are inserted inside the cover 17. Also, the above sensorunitA mounting flange 23 is fixedly provided on the outer peripheral surface of the intermediate portion 4, and the mounting flange 23 is fixed to the closing plate portion 19 of the cover 17 with set screws 24, 24.unit4 is coupled and fixed to the cover 17 in a predetermined positional relationship. Sensor like thisunitIn a state where 4 is coupled and fixed to the cover 17, the front end surface of the detection unit 22 faces the inner side surface of the circular ring portion 15 constituting the encoder 3 via a minute gap.
[0007]
  When the rolling bearing unit with the rotational speed detection device as described above is used, the mounting portion 12 fixed to the outer peripheral surface of the outer ring 1 is coupled and fixed to the suspension device by a bolt (not shown), and the outer periphery of the hub 2 is fixed. By fixing the wheel to the flange 11 fixed to the surface by a stud 25 provided on the flange 11, the wheel is supported rotatably with respect to the suspension device. If the wheel rotates in this state, the sensorunit4 near the end face of the detection unit 22, the through holes 16, 16 formed in the annular portion 15 and the column portions existing between the through holes 16, 16 adjacent to each other in the circumferential direction alternately pass. . As a result, the sensorunitThis sensor changes the density of the magnetic flux flowing throughunitThe output of 4 changes. In this way the sensorunitThe frequency at which the output of 4 changes is proportional to the rotational speed of the wheel. Therefore, the sensorunitIf the output of 4 is sent to a controller (not shown), ABS and TCS can be controlled appropriately.
[0008]
[Description of the invention]
  Japanese Patent Application No. 9-196974 discloses a structure that can easily and quickly perform the work of attaching and detaching the sensor to and from the cover to reduce the cost. 6 to 10 show an example of the structure according to the present invention. Of outer ring 1, The other end described in the claim,The opening at the inner end (the right end in FIG. 6) is closed by a cover 17a. The cover 17a includes a bottomed cylindrical main body 26 formed by injection molding a synthetic resin, and a fitting cylinder 27 coupled to an opening of the main body 26. The fitting cylinder 27 is formed by plastically deforming a corrosion-resistant metal plate such as a stainless steel plate, and has an L-shaped cross section as a whole. The fitting cylinder 27 and a base of the fitting cylinder 28 are provided. And an inward flange 29 bent inward in the diameter direction from the end edge (the right end edge in FIG. 6). Such a fitting cylinder 27 is coupled to the opening of the main body 26 by molding the inwardly-extending flange portion 29 at the time of injection molding of the main body 26. In the inward flange portion 29, a large number of small holes 30, 30 are intermittently formed in the circumferential direction. The synthetic resin constituting the main body 26 flows into the small holes 30 and 30 when the main body 26 is injection-molded, and the bonding strength between the main body 26 and the fitting cylinder 27 is increased.
[0009]
  The cover 17a configured as described above has an inner end opening portion of the outer ring 1 by fixing the fitting tube portion 28 of the fitting tube 27 to the inner end portion of the outer ring 1 with an interference fit. It is blocking. In this state, the end surface of the opening of the main body 26, that is, the front end surface of the cylindrical wall portion 31 formed on the outer peripheral edge of the main body 26 is brought into contact with the inner end surface of the outer ring 1. A locking groove is formed on the entire end surface of the cylindrical wall portion 31 and an O-ring 32 is locked in the locking groove. In a state where the tip surface of the cylindrical wall portion 31 and the inner end surface of the outer ring 1 are in contact with each other, the O-ring 32 is elastically compressed between the inner end surface and the bottom surface of the locking groove, The joint between the cover 17a and the outer ring 1 is sealed to prevent foreign matters such as muddy water from entering the cover 17a.
[0010]
  On the other hand, an encoder 3a is externally fitted and fixed to the inner end portion (the right end portion in FIG. 6) of the inner ring 7 constituting the inner ring equivalent member together with the hub 2. The encoder 3 a includes a support ring 33 and a permanent magnet 34. Of these, the support ring 33 is formed by bending a magnetic metal plate such as SPCC, SPCD, SPCE or the like to form an annular shape as a whole with an L-shaped cross section, and is fitted and fixed to the inner end of the inner ring 7 by an interference fit. ing. The permanent magnet 34 is formed, for example, by attaching rubber mixed with ferrite powder to the inner surface of the annular portion constituting the support ring 33 by baking or the like. The permanent magnet 34 is magnetized, for example, in the axial direction (left and right direction in FIG. 6), and the magnetization direction is changed alternately and at equal intervals in the circumferential direction. Therefore, S poles and N poles are alternately arranged at equal intervals on the inner side surface of the encoder 3a in the circumferential direction.
[0011]
  Further, a part of the bottom plate portion 35 of the main body 26 constituting the cover 17a is opposed to the inner surface of the permanent magnet 34 constituting the encoder 3a, and an insertion hole 36 is passed through the bottom plate portion 35. Thus, the outer ring 1 is formed in the axial direction. A portion near the tip of the sensor unit 37 is inserted into the insertion hole 36. This sensor unit 37 incorporates a magnetic detecting element such as a Hall element, a magnetoresistive element (MR element), etc., whose characteristics change according to the flow direction of magnetic flux, and a waveform shaping circuit for adjusting the output waveform of this magnetic detecting element. A sensor composed of an IC and a pole piece made of a magnetic material for guiding the magnetic flux from the permanent magnet 34 (or flowing into the permanent magnet 34) to the magnetic detection element is embedded in a synthetic resin. It consists of Further, an end of a harness 38 for sending an output signal output as a waveform shaped from the IC to a controller (not shown) is connected to the sensor unit 37.
[0012]
  Such a sensor unit 37 is provided near the distal end (left end in FIG. 6), and has a columnar insertion portion 39 through which the insertion hole 36 can be inserted without rattling, and a proximal end portion of the insertion portion 39 ( And an outward flange-shaped flange portion 40 formed at the right end portion of FIG. A locking groove is formed on the outer peripheral surface of the intermediate portion of the insertion portion 39, and an O-ring 41 is locked in the locking groove. In a state where the insertion portion 39 is inserted into the insertion hole 36, the O-ring 41 is elastically compressed between the inner peripheral surface of the insertion hole 36 and the bottom surface of the locking groove, and the insertion portion 39 Is sealed between the outer peripheral surface of the insertion hole and the inner peripheral surface of the insertion hole 36. That is, the O-ring 41 prevents foreign matter such as muddy water from entering the cover 17 a and the outer ring 1 through the insertion hole 36. Thus, the O ring 32 seals the joint between the outer ring 1 and the cover 17a, and the O ring 41 seals the insertion part of the sensor unit 37 with respect to the cover 17a. To prevent mixing, the durability of the rolling bearing unit is ensured.
[0013]
  On the other hand, a part of the outer surface of the bottom plate portion 35 constituting the cover 17a (the right side surface in FIG. 6 on the side surface opposite to the space 42 where the rolling elements 9, 9 should be closed by the cover 17a) A locking cylinder 43 is provided around the opening of the insertion hole 36. The inner peripheral surface of the locking cylinder 43 constitutes a single cylindrical surface together with the inner peripheral surface of the insertion hole 36. Further, locking recesses 44 are provided at two positions on the outer peripheral surface of the locking cylinder 43 on the opposite side in the diameter direction. Each of the locking recesses 44 has a width sufficiently larger than the outer diameter of the wire constituting the coupling spring 45 described below. Then, on one side surface, locking grooves 46, 46 each having a circular arc cross section are formed on the inner side surface of the locking cylinder 43 at the tip side (the right side in FIGS. It is formed in a row. The radius of curvature of the cross section of each of the locking grooves 46, 46 is the same as or slightly larger than the radius of curvature of the outer peripheral surface of the wire constituting the coupling spring 45.
[0014]
  The flange portion 40 that functions as a positioning portion provided at the base end portion of the sensor unit 37 is brought into contact with the distal end surface (the right end surface in FIGS. 6 and 9) of the locking cylinder 43 formed as described above. It is fixedly coupled to the locking cylinder 43 by a coupling spring 45 described below. The coupling spring 45 is formed by bending a wire material having elasticity and corrosion resistance, such as stainless steel spring steel, spring steel plated with chrome or zinc. The coupling spring 45 holds the pair of locking legs 47 and 47 that are parallel to each other in an assembled state to at least the locking cylinder 43 and the flange 40 toward the distal end surface of the locking cylinder 43. And a pair of connecting portions 49 for connecting the both ends of the holding portion 48 to the base end portions (upper right end portions in FIG. 10) of the locking legs 47, 47, 49. The holding portion 48 has a U-shaped curved portion 50 at an intermediate portion and linear portions 51 and 51 bent at opposite ends from opposite ends of the curved portion 50 in opposite directions. One end of each of the connecting portions 49, 49 is bent in the same direction from the end of each of the straight portions 51, 51.
[0015]
  In the coupling spring 45 as described above, at least in a use state, the plane including the pair of locking leg portions 47 and 47 and the plane including the holding portion 48 are parallel to each other. However, in the free state of the coupling spring 45, the angle of the continuous portion between one end of each of the connecting portions 49, 49 and the base end portion of each of the locking leg portions 47, 47 so that the space between these planes is reduced. Elasticity is given in the direction of reducing. Further, the distance D in the free state between the main body portions of the pair of locking legs 47, 47.₄₇(FIG. 10) is a distance D between the locking recesses 44, 44.₄₄A little smaller than (Fig. 9) (D₄₇<D₄₄)doing. Furthermore, the tip portions of the pair of locking leg portions 47, 47 are bent in opposite directions, and the distance between the tip portions of the locking leg portions 47, 47 increases toward the end portion. Like.
[0016]
  On the other hand, on the base end surface of the flange 40 provided in the sensor unit 37 (the surface opposite to the insertion portion 39, the right end surface in FIG. 6 and the front hand surface in FIG. 8), the holding portion 48 of the coupling spring 45 is provided. A holding groove 52 is formed to engage with each other without rattling. The holding groove 52 includes a curved portion 53 provided in a state of surrounding the proximal end portion of the harness 38, and a straight portion 54 that is bent in opposite directions from both ends of the curved portion 53 and opened to the outer peripheral edge of the flange portion 40. , 54. In addition, an inclined surface 55 is formed in a part of the base end surface of the flange portion 40 that faces the convex side of the curved portion 53. The inclined surface 55 is inclined in such a direction that the thickness of the flange portion 40 becomes smaller toward the end edge of the flange portion 40.
[0017]
  The operation of mounting the sensor unit 37 on the cover 17a in order to form the rolling bearing unit with the rotational speed detection device of the present invention by combining the respective members configured as described above is as follows. Do. First, the insertion portion 39, which is a portion closer to the distal end of the sensor unit 37, is inserted into the locking cylinder 43 and the insertion hole 36, and the flange 40 is brought into contact with the distal end surface of the locking cylinder 43. In this state, a desired thickness dimension (for example, 0.5 mm) is provided between the detection portion provided on the distal end surface of the insertion portion 39 constituting the sensor unit 37 and the inner surface of the permanent magnet 34 constituting the encoder 3a. The dimension of each part is regulated so that there is a minute gap. Next, the coupling spring 45 is mounted between the locking cylinder 43 provided on the cover 17 a and the sensor unit 37, and the flange portion 40 is pressed against the distal end surface of the locking cylinder 43.
[0018]
  As described above, the operation of mounting the coupling spring 45 between the locking cylinder 43 provided on the cover 17a and the sensor unit 37 includes a pair of locking legs 47 constituting the coupling spring 45, 47 is inserted into the locking recesses 44, 44 of the locking cylinder 43 from the front end side of the locking legs 47, 47. Since the distance between the tip portions of the locking leg portions 47 and 47 increases toward the end portion, this insertion operation can be easily performed. As the insertion work proceeds, the straight portions 51 and 51 of the holding portion 48 ride on the inclined surface 55 formed on the flange portion 40. If the insertion operation is further continued from this state, the holding portion 48 engages with a holding groove 52 formed on the base end surface of the flange portion 40. It should be noted that during this insertion operation, a portion of the pair of connecting portions 49, 49 that is opposed to the outer peripheral edge of the flange 40 does not interfere with the outer peripheral edge of the flange 40. The interval between portions of the connecting portions 49, 49 close to the restraining portion 48 is set slightly larger than the outer diameter of the flange portion 40.
[0019]
  As described above, in a state where the holding portion 48 is engaged with the holding groove 52, the coupling spring 45 directs the flange portion 40 toward the end surface of the locking cylinder 43 with a sufficiently large force (for example, about 10 kgf). The sensor unit 37 is coupled to the cover 17a by pressing. Further, in this state, the coupling spring 45 is based on the engagement of the locking leg portions 47 and 47 with the locking grooves 46 and 46 and the engagement of the holding portion 48 and the holding groove 52. Is not accidentally detached from the sensor unit 37 and the locking cylinder 43. As a result, the sensor unit 37 is not accidentally detached from the cover 17a.
[0020]
  When removing the sensor unit 37 from the cover 17a, the coupling spring 45 is first removed from between the cover 17a and the sensor unit 37, contrary to the mounting operation described above. The removing operation is performed by first lifting the holding portion 48 from the base end surface of the flange 40 and then removing the pair of locking legs 47 and 47 from the locking recesses 44 and 44. After removing the coupling spring 45 in this way, the insertion portion 39 of the sensor unit 37 is extracted from the inside of the insertion hole 36 and the locking cylinder 43.
[0021]
  The operation of attaching and detaching the coupling spring 45 between the locking cylinder 43 provided on the cover 17a and the sensor unit 37 involves tightening or loosening the set screws 24 and 24 (see FIGS. 4 to 5). Compared to work, it can be done easily and quickly. Therefore, according to the previous invention, it is possible to reduce the labor required for attaching / detaching the sensor unit 37 to / from the cover 17a, and to reduce the cost of the rolling bearing unit with a rotational speed detection device itself and the cost required for repair.
[0022]
[Problems to be solved by the invention]
  In the case of the conventional structure as shown in FIGS. 4 to 5 described above and the structure according to the prior invention as described above, it is desired to improve the following points.
  First, in the case of the conventional structure, the fitting portion between the outer ring 1 and the cover 17 and the seal of the gap between the inner peripheral edge of the through hole 21 formed in the cover 17 and the outer peripheral surface of the sensor 4 are particularly considered. Not. The rolling bearing unit with a rotational speed detection device is sprayed with rain water wound up by wheels during rainy weather, washing water ejected from a high-pressure car wash machine during car washing, or the like. When such rain water or washing water enters the space where the rolling elements 9, 9 are installed between the inner peripheral surface of the outer ring 1 and the outer peripheral surfaces of the hub 2 and the inner ring 7, the grease filled in this space , And the outer ring and the inner ring raceways 5, 6 and the rolling surfaces of the rolling elements 9, 9 are rusted.
[0023]
  On the other hand, in the case of the prior invention shown in FIG. 6, the O-ring 32 locked to the tip surface of the cylindrical wall portion 31 constituting the cover 17a and the outer peripheral surface of the insertion portion 39 of the sensor unit 37 are engaged. The stopped O-ring 41 prevents rainwater, washing water, and the like from entering the space where the rolling elements 9 and 9 are installed between the inner peripheral surface of the outer ring 1 and the outer peripheral surfaces of the hub 2 and the inner ring 7. . However, since two O-rings 32 and 41 are used in order to prevent rainwater, washing water, etc. from entering this space, a locking groove for locking these O-rings 32 and 41. It is inevitable that the cost for sealing is increased in combination with the troublesome processing work.
  In view of such circumstances, the rolling bearing unit with a rotational speed detection device of the present invention has a sensor attached to the cover fixed to the outer ring.DetachableThe idea is to realize an inexpensive structure that can effectively prevent rainwater, washing water, and the like from entering the part where the rolling elements are installed, in a supported structure.
[0024]
[Means for Solving the Problems]
  Of the rolling bearing unit with a rotational speed detection device of the present invention, claims1The rolling bearing unit with a rotational speed detection device described in is similar to the rolling bearing unit with a rotational speed detection device of the prior art or the prior invention described above,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. An outer ring formed on the outer circumferential surface of the outer ring raceway and a second outer ring raceway facing the second inner ring raceway, and a second flange on the outer peripheral surface,the aboveFirst, secondOuter ring raceway and aboveFirst, secondBetween the inner ring racewayMultiple eachFree to rollProvidedRolling element and aboveInner ringofotherOn the outer peripheral surface of the endInner ringAnd an encoder that is fixed concentrically with the characteristics extending in the circumferential direction alternately and at equal intervals.Outer ringofotherThis at the end openingotherA cover fixed in a state of closing the end opening, an insertion hole formed in a portion of the cover facing the encoder, and a detection unit; the detection unit is inserted into the insertion hole of the cover On the part of the cover with the part facing the encoder.DetachableSupported, changing the output signal in response to changes in the encoder characteristicsThe cover is held down in the axial direction without rattlingSensorunitWith.
  In particular, in the rolling bearing unit with a rotational speed detection device of the present invention, in the rolling bearing unit with a rotational speed detection device according to claim 1,An inner ring that is externally fitted to the stepped portion by a caulking portion that is formed by caulking and expanding the cylindrical portion formed at the other end of the hub at least in a portion protruding from the inner ring that is externally fitted to the stepped portion. Is pressed against the step surface of the step portion, and the inner ring externally fitted to the step portion is coupled and fixed to the hub, andAbove cover and aboveOuter ringAnd byotherLocated between the detected portion of the encoder and the rolling element in the axial direction inside the space whose end is closed,Outer ringofotherThe seal ring is supported and fixed at the end, and the seal lip constituting the seal ring is slid over the entire circumference of the part of the encoder.And the sensor unit has an insertion portion and a flange portion, and the flange portion of the sensor unit is located on the surface of the cover that is located closest to the other end side opposite to the first flange in the axial direction. Abuts to position the sensor unit in the axial direction.
  Further claims2The rolling bearing unit with rotational speed detector described inA 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. An outer ring formed on the outer circumferential surface of the outer ring raceway and a second outer ring raceway facing the second inner ring raceway, and a second flange on the outer peripheral surface,the aboveFirst, secondOuter ring raceway and aboveFirst, secondBetween the inner ring racewayMultiple eachFree to rollProvidedRolling element and aboveInner ringofotherOn the outer peripheral surface of the endInner ringAnd an encoder that is fixed concentrically with the characteristics extending in the circumferential direction alternately and at equal intervals.Outer ringofotherA cover having a bottom plate portion fixed to the end opening, an insertion hole formed in a portion of the cover facing the encoder, and a detection unit, the detection unit being an insertion hole of the cover In a part of the cover in a state where it is inserted through and opposed to a part of the encoder.DetachableSupported, changing the output signal in response to changes in the encoder characteristicsThe cover is held down in the axial direction without rattlingSensorunitWith.
  In particular, the claims2In the rolling bearing unit with a rotational speed detector described inAn inner ring that is externally fitted to the stepped portion by a caulking portion that is formed by caulking and expanding the cylindrical portion formed at the other end of the hub at least in a portion protruding from the inner ring that is externally fitted to the stepped portion. Is pressed against the step surface of the step portion, and the inner ring externally fitted to the step portion is coupled and fixed to the hub, andThe insertion hole is provided in a part of the bottom plate portion of the cover in the axial direction at a portion facing the encoder, and the axial direction of the encoder is closer to the rolling element than the bottom plate portion of the cover in the axial direction. A seal ring is provided at the part located between the detected part and these rolling elements to block the inside and outside of the space where these rolling elements are installed.And the sensor unit has an insertion portion and a flange, and the flange of the sensor unit is located on the surface of the cover that is located closest to the other end opposite to the first flange in the axial direction. The parts abut and position the sensor unit in the axial direction.
[0025]
[Action]
  The rolling bearing unit with the rotational speed detection device of the present invention configured as described above supports the wheel rotatably with respect to the suspension device, and the operation when detecting the rotational speed of the wheel is the conventional or Is the same as the rolling bearing unit with the rotational speed detection device of the previous invention.
  In particular, in the case of the rolling bearing unit with a rotational speed detection device of the present invention, rain water, washing water, etc. are generated in the space where a plurality of rolling elements are installed between the outer ring raceway and the inner ring raceway by one seal ring. It can prevent entering. Therefore, there is no deterioration of the grease filled in the space, and the outer ring, the inner ring raceways, and the rolling surfaces of the rolling elements are not rusted. Cost reduction. or,Outer ringEven when the wall thickness is small and the width of the end face is narrow and it is difficult to secure an O-ring mounting space, sufficient sealing performance can be ensured.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
  1 and 2 show a first example of an embodiment of the present invention. The features of the present inventionone ofIs a structure for preventing rainwater, washing water, etc. from entering the space where the rolling elements 9, 9 are installed between the inner peripheral surface of the outer ring 1 and the outer peripheral surfaces of the hub 2a and the inner ring 7. Since the structure and operation of the other parts are the same as the structure of the previous invention shown in FIGS. 6 to 10 described above in many respects, the same parts are denoted by the same reference numerals, and redundant description is omitted. The characteristic part of the present invention and the part different from the structure of the previous invention will be described.
[0027]
  Of the inner ring 7 constituting the inner ring equivalent member together with the hub 2a., The other end described in the claim,On the shoulder 56 provided at the inner end (the right end in FIGS. 1 and 2), the base half (the left half in FIGS. 1 and 2) of the encoder 3b is externally fixed by an interference fit. The encoder 3b is formed of a magnetic metal plate such as SPCC, SPCD, SPCE or the like and is formed into a substantially cylindrical shape with a crank section in cross section. The large diameter portion 58 is continued by the step portion 59. The large-diameter portion 58 includes a plurality of slit-shaped through holes 60 and 60 that are long in the axial direction (left and right in FIGS. 1 and 2), and are formed at equal intervals in the circumferential direction. Yes.
[0028]
  The large-diameter portion 58 of the encoder 3b projects inward from the inner end surfaces of the outer ring 1 and the inner ring 7 in a state where the small-diameter portion 57 is fitted and fixed to the shoulder portion 56. And the sensor 4a which comprises the sensor unit 37a is made to oppose the outer peripheral surface of the said large diameter part 58 through the micro clearance gap extending over a radial direction. In the case of this example, this sensor 4a is an IC incorporating a magnetic detecting element such as a Hall element, a magnetoresistive element or the like that changes its characteristics according to the amount of magnetic flux, and a waveform shaping circuit for adjusting the output waveform of this magnetic detecting element. And a permanent magnet. The sensor unit 37a incorporating such a sensor 4a is detachably attached to the cover 17a fixed to the inner end opening of the outer ring 1 in the same manner as the structure of the previous invention shown in FIGS. I support it. However, in the case of the present invention, the O-ring 41 as in the case of the previous invention is not attached to the sensor unit 37a. Further, the O-ring 32 (FIG. 6), which is a sealing member like the structure of the previous invention, is not locked to the front end surface of the cylindrical wall portion 31 constituting the cover 17a. Further, the sensor 4a which is the detection portion of the sensor unit 37a and faces the outer peripheral surface of the large diameter portion 58 is disposed on the inner peripheral surface side of the tip end portion of the sensor unit 37a.Further, the flange portion 40 of the sensor unit 37a abuts on the surface located on the inner end side, which is the other end side opposite to the first flange 11 in the axial direction of the cover 17a, and this sensor unit. 37a is positioned in the axial direction.
[0029]
  On the other hand, a seal ring 61 is fitted and fixed to the inner end of the outer ring 1. The seal ring 61 is made of a metal core 62 formed by bending a metal plate into an L-shaped cross section and formed into an annular shape as a whole, and an elastic material such as rubber or vinyl. And a seal lip 63 attached thereto. The leading edge of the seal lip 63 is brought into sliding contact with the outer peripheral surface of the small diameter portion 57 and the outer surface of the step portion 59 constituting the encoder 3b over the entire periphery. Therefore, of the opening portions at both ends of the space 64 in which the rolling elements 9, 9 are installed between the inner peripheral surface of the outer ring 1 and the outer peripheral surfaces of the hub 2a and the inner ring 7, the inner end opening portion is connected to the encoder 3b. It is sealed by the seal ring 61. For this reason, the seal ring 61 is arranged on the rolling elements 9 and 9 side with respect to the bottom plate portion 35 of the cover 17a in the axial direction, and the large diameter portion 58 which is a detected portion of the encoder 3b in the axial direction. It is supported and fixed to the inner end portion of the outer ring 1 located between the moving bodies 9 and 9. Further, the seal ring 61 is provided in a portion located between the large diameter portion 58 of the encoder 3b and the rolling elements 9 and 9 on the side of the rolling elements 9 and 9 with respect to the bottom plate portion 35 in the axial direction. Thus, the inside and outside of the space 64 in which the rolling elements 9 and 9 are installed are blocked. In the example shown in the drawing, the cross-sectional shape of the seal lip 63 is bifurcated, and grease can be held between the bifurcated portions. This grease lubricates the sliding portion between the tip edge of the seal lip 63 and the encoder 3b, thereby reducing the resistance of the sliding portion and improving the sealing performance. On the other hand, the space 64, One end of the claim,Outer edgeofThe opening is sealed by the seal ring 13 as in the conventional structure and the structure of the previous invention.
[0030]
  In the illustrated example, a caulking portion 65 is formed at the inner end portion of the hub 2a in order to couple and fix the inner ring 7 to the hub 2a. That is, the tip of the cylindrical portion 66 formed at the inner end of the hub 2a is connected to the inner ring 7 as the inner end of the hub 2a.Stepped part 74 formed inAfter the outer fitting, the inner ring 7 is pressed against the stepped surface 67 formed on the outer peripheral surface of the hub 2a by the caulking portion 65. The inner ring 7 is coupled and fixed to 2a. By configuring in this way, the nut 6 (FIGS. 4 and 6) is omitted to reduce the cost based on the reduction in the number of parts, and at the same time, the axial dimension of the inner ring equivalent member is shortened, It is possible to reduce the size and weight of the rolling bearing unit with a rotational speed detection device.
[0031]
  In the case of the rolling bearing unit with a rotational speed detection device of the present invention configured as described above, the single seal ring 13First, secondOuter ring raceway5a, 5bWhenFirst, secondInner ring raceway8a, 8bIt is possible to prevent rainwater, washing water or the like from entering the space 64 of the portion where the plurality of rolling elements 9 and 9 are installed. Further, it is not necessary to form a locking groove for locking the O-ring at each part. Accordingly, the grease filled in the space 64 is deteriorated, and both the outer ring and the inner ring raceways are used.5a, 5b, 8a, 8bIn addition, the rolling surfaces of the rolling elements 9 and 9 are not rusted, and the cost of the rolling bearing unit with a rotational speed detector having excellent durability can be reduced.
[0032]
  There is a possibility that rain water or cleaning water may enter the space 68 between the seal ring 61 and the cover 17a. However, out of the encoder 3b and the sensor 4b existing in the space 68, the encoder 3b is made of a corrosion-resistant metal plate such as a stainless steel plate or a plated steel plate, thereby preventing damage due to intrusion of rainwater or washing water. it can. Further, since the sensor 4b is embedded in the synthetic resin constituting the sensor unit 37a, it is not damaged by the entry of rainwater or washing water. Moreover, only a small amount of rain water or washing water enters the space 68 and the rain water or washing water is not sprayed toward the seal ring 61. Therefore, even if the sealing performance by the seal ring 61 is not particularly increased, it is ensured that rain water, washing water, etc. enter the space 64 where the rolling elements 9 and 9 are installed beyond the seal ring 61. Can be prevented.
[0033]
  Next, FIG. 3 shows a second example of the embodiment of the present invention. In the case of this example, the encoder 3 c is constituted by a support ring 69 and a permanent magnet 70. Of these, the support ring 69 is formed of a magnetic metal plate such as SPCC, SPCD, SPCE or the like and is formed into a substantially cylindrical shape with a crank section in cross section. The small-diameter portion 72 on the front half side is continued by a stepped portion 73. The permanent magnet 70 is formed in a cylindrical shape, and is supported and fixed to the outer peripheral surface of the small diameter portion 72 over the entire circumference. The permanent magnet 70 such as a rubber magnet or a plastic magnet is magnetized in the diametrical direction. The magnetization direction is changed alternately at equal intervals over the circumferential direction. Accordingly, N poles and S poles are alternately arranged at equal intervals on the outer peripheral surface of the permanent magnet 70. Along with the use of a permanent magnet for the encoder 3c, the sensor 4b used in this example does not incorporate a permanent magnet. That is, the sensor 4b is configured by an IC incorporating a magnetic detecting element such as a Hall element, a magnetoresistive element, or the like that changes characteristics according to the direction of magnetic flux, and a waveform shaping circuit for adjusting the output waveform of the magnetic detecting element. ing.
[0034]
  In the encoder 3c as described above, the large-diameter portion 71 constituting the support ring 69 is connected to the inner ring 7., The other end described in the claim,The shoulder portion 56 provided on the inner end portion is externally fixed by an interference fit, and the stepped portion 73 is abutted against the inner end surface of the inner ring 7. On the other hand, also in this example, the seal ring 61 is fitted and fixed to the inner end portion of the outer ring 1. The leading edge of the seal lip 63 constituting the seal ring 61 is brought into sliding contact with the outer peripheral surface of the large-diameter portion 71 and the inner side surface of the stepped portion 73 constituting the encoder 3c over the entire circumference. . Therefore, the inner end opening of the space 64 in which the rolling elements 9, 9 are installed between the inner peripheral surface of the outer ring 1 and the outer peripheral surfaces of the hub 2a and the inner ring 7 constitutes the encoder 3c. Sealing is performed by the support ring 69 and the seal ring 61. Other configurations and operations are the same as those of the first example described above.
[0035]
【The invention's effect】
  Since the rolling bearing unit with a rotational speed detection device of the present invention is configured and operates as described above, the cost required for repair and replacement of the sensor can be kept low, and a structure having excellent durability is inexpensive. Can be realized.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first example of an embodiment of the present invention.
FIG. 2 is an enlarged view of a portion A in FIG.
FIG. 3 is a sectional view showing a second example of the embodiment of the present invention.
4 is a BOC sectional view of FIG. 5, showing an example of a conventional structure.
5 is a view from the left side of FIG.
FIG. 6 is a cross-sectional view showing an example of an embodiment of the prior invention.
FIG. 7 is a perspective view showing only a cover taken out.
FIG. 8 is a perspective view showing only the end of the harness and the sensor unit.
FIG. 9 is a cross-sectional view showing the portion D in FIG. 6 with only the cover taken out.
FIG. 10 is a perspective view of a coupling spring for coupling the sensor unit and the cover.
[Explanation of symbols]
    1 outer ring
    2, 2a hub
    3, 3a, 3b, 3c encoder
    4 Sensor unit
    4a, 4b sensor
    5a First outer ring raceway
    5b Second outer ring raceway
    6 Nut
    7 inner ring
    8a First inner ring raceway
    8b Second inner ring raceway
    9 Rolling elements
  10 Cage
  11FirstFlange
  12 Mounting part
  13 Seal ring
  14 Cylindrical part
  15 torus
  16 Through hole
  17, 17a Cover
  18 Fitting cylinder
  19 Blocking plate
  20 bulge
  21 Through hole
  22 Detector
  23 Mounting flange
  24 Set screw
  25 Stud
  26 body
  27 Mating cylinder
  28 Fitting cylinder
  29 Inward head
  30 small holes
  31 Cylindrical wall
  32 O-ring
  33 Support ring
  34 Permanent magnet
  35 Bottom plate
  36 Insertion hole
  37, 37a Sensor unit
  38 Harness
  39 Insertion
  40 buttock
  41 O-ring
  42 space
  43 Locking cylinder
  44 Locking recess
  45 Combined spring
  46 Locking groove
  47 Locking leg
  48 restraining part
  49 Connecting part
  50 Curved part
  51 Straight section
  52 Retaining groove
  53 Curved part
  54 Straight section
  55 Inclined surface
  56 shoulder
  57 Small diameter part
  58 Large diameter part
  59 steps
  60 through holes
  61 Seal ring
  62 Core
  63 Seal Lip
  64 spaces
  65 Caulking part
  66 Cylindrical part
  67 Step surface
  68 space
  69 Support ring
  70 Permanent magnet
  71 Large diameter part
  72 Small diameter part
  73 steps
  74 steps

Claims

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. An outer ring, a second outer ring race facing the second inner ring race, an outer ring formed with a second flange on the outer peripheral surface, the first and second outer ring races, and the first and rolling elements arranged rollably by a plurality respectively between the second inner ring raceway, which is fixed to the inner ring concentric to the other end portion outer peripheral surface of the inner ring, the over characteristics in the circumferential direction an encoder is changed at regular intervals and alternately, other end opening of the outer ring in a state opposed to the encoder To a cover which is fixed in a state of closing the other end opening, and the insertion hole portion in which is formed on the encoder and the facing portion of the cover, has a detection unit, the detection portion of the cover is passed through the insertion hole is supported detachably on a part of the cover while being opposed to a part of the encoder, to vary the output signal in response to changes in the characteristics of the encoder, backlash in the cover In a rolling bearing unit with a rotational speed detector equipped with a sensor unit that is restrained in the axial direction without sticking ,
An inner ring that is externally fitted to the stepped portion by a caulking portion that is formed by caulking and expanding the cylindrical portion formed at the other end of the hub at least in a portion protruding from the inner ring that is externally fitted to the stepped portion. the put suppressed towards the stepped surface of the stepped portion, the outer fitting the inner ring on the step portion is fixedly connected to said hub, and the inner by the said cover and the outer ring was closed the other end space in, located between the detected part and the rolling elements of the encoder in the axial direction, the sealing ring as well as supported by and fixed to the other end portion of the outer ring, a seal lip constituting the sealing ring of the encoder one And the sensor unit has an insertion portion and a flange portion, and the other end side opposite to the first flange in the axial direction of the cover. The sensor unit above the closest surface Tsu contact the flange portion of the bets are those, rolling bearing unit, characterized in that that the axial positioning of the sensor unit.

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. An outer ring, a second outer ring race facing the second inner ring race, an outer ring formed with a second flange on the outer peripheral surface, the first and second outer ring races, and the first A plurality of rolling elements provided between the second inner ring raceway and a plurality of rolling elements, and a circumferentially fixed characteristic fixed to the outer peripheral surface of the other end of the inner ring concentrically with the inner ring. Encoders that are alternately and equally spaced, and the other end opening of the outer ring facing this encoder A cover having a bottom plate portion, a part of the cover, an insertion hole formed in a part facing the encoder, and a detection part, and the detection part is inserted through the insertion hole of the cover. And is detachably supported by a part of the cover in a state of facing the part of the encoder, and changes an output signal in response to a change in the characteristics of the encoder. In a rolling bearing unit with a rotational speed detection device provided with a suppressed sensor unit,
An inner ring that is externally fitted to the stepped portion by a caulking portion that is formed by caulking and expanding the cylindrical portion formed at the other end of the hub at least in a portion protruding from the inner ring that is externally fitted to the stepped portion. The inner ring that is externally fitted to the stepped portion is coupled and fixed to the hub, and the insertion hole is part of the bottom plate portion of the cover to the encoder. It is provided in the axial direction in the facing part, and in the axial direction, on the side of the rolling element relative to the bottom plate part of the cover, the part positioned between the detected part of the encoder and the rolling element A seal ring is provided for blocking the inside and outside of the space where the rolling elements are installed, and the sensor unit has an insertion portion and a flange portion, and the first flange with respect to the axial direction of the cover The highest position on the other end of the opposite side Surfaces in contact flange portion of the sensor unit is brought, rolling bearing unit, characterized in that that the axial positioning of the sensor unit.