JP2003254985A - Rolling bearing unit having rotating speed detecting device - Google Patents

Rolling bearing unit having rotating speed detecting device

Info

Publication number
JP2003254985A
JP2003254985A JP2002057680A JP2002057680A JP2003254985A JP 2003254985 A JP2003254985 A JP 2003254985A JP 2002057680 A JP2002057680 A JP 2002057680A JP 2002057680 A JP2002057680 A JP 2002057680A JP 2003254985 A JP2003254985 A JP 2003254985A
Authority
JP
Japan
Prior art keywords
encoder
ring
rotation speed
peripheral surface
sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2002057680A
Other languages
Japanese (ja)
Other versions
JP2003254985A5 (en
Inventor
Yuji Nakamura
雄二 中村
Masaru Hashida
勝 橋田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NSK Ltd
Original Assignee
NSK Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NSK Ltd filed Critical NSK Ltd
Priority to JP2002057680A priority Critical patent/JP2003254985A/en
Publication of JP2003254985A publication Critical patent/JP2003254985A/en
Publication of JP2003254985A5 publication Critical patent/JP2003254985A5/ja
Pending legal-status Critical Current

Links

Classifications

    • 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
    • F16C33/7896—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members with two or more discrete sealings arranged in series
    • 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
    • F16C33/80—Labyrinth sealings
    • F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/186—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • 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
    • F16C33/78—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
    • F16C33/7883—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 mounted to the inner race and of generally L-shape, the two sealing rings defining a sealing with box-shaped cross-section

Abstract

<P>PROBLEM TO BE SOLVED: To improve reliability of rotating speed detection by preventing a foreign substance from entering a portion between a detection part of the rotating speed sensor 24a and a part to be detected of an encoder 33 even before assembling to an automobile. <P>SOLUTION: A sensor holder 34 is externally fitted and secured to an inner end part of an outer wheel 1. The sensor holder 34 comprises a fitting cylinder 42 of an L-shape in cross section and a holding part 43 which is made of a synthetic resin having enclosed therein the rotation speed sensor 24a connected to the fitting cylinder 42. An inner diameter side part of a radial outside face of an inward flange 45 constituting the fitting cylinder 42 and an outer diameter side part of an inside end face of an inner ring 3 to which the encoder 33 is externally fitted and secured are faced each other via a minute crevice 47 along the whole circumference. <P>COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】 【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）或はトラ
クションコントロールシステム（ＴＣＳ）を制御する為
には、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】この様な目的で使用される回転速度検出装
置付転がり軸受ユニットの１例として、特開平９−２１
８２２号公報には、図６〜７に示す様な構造が記載され
ている。この従来から知られている回転速度検出装置付
転がり軸受ユニットは、図示しない懸架装置に支持固定
して使用時にも回転しない外輪１の内径側に、それぞれ
が内輪相当部材を構成するハブ２及び内輪３を回転自在
に支持している。即ち、上記外輪１は、外周面にこの外
輪１を懸架装置に取り付ける為の第一のフランジ４を、
内周面に複列の外輪軌道５、５を、それぞれ有する。
又、上記ハブ２は、外周面の外（軸方向に関しては、自
動車の組み付け状態で車両の幅方向外側。本明細書で同
じ。図２、７を除く各図の左側。）端寄り部分に、車輪
を支持する為の第二のフランジ６を設けている。又、上
記ハブ２の外周面の中間部に第一の内輪軌道７を形成
し、同じく内（軸方向に関しては、自動車の組み付け状
態で車両の幅方向中央側。本明細書で同じ。図２、７を
除く各図の右側。）端寄り部分に形成した小径段部８
に、その外周面に第二の内輪軌道９を形成した上記内輪
３を外嵌している。 【０００４】又、上記各外輪軌道５、５と上記各内輪軌
道７、９との間には、それぞれ複数個ずつの転動体１
０、１０を転動自在に設け、上記外輪１の内径側に、上
記ハブ２及び内輪３を回転自在に支持している。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
間に第一のシールリング１１を設けている。この第一の
シールリング１１は、上記玉１０、１０を設置した円筒
状空間１２の外端開口を塞ぎ、この円筒状空間１２内の
グリースが外部に漏洩したり、或は外部に存在する異物
がこの円筒状空間１２内に進入する事を防止する。尚、
図示の例では、転動体１０として玉を使用しているが、
重量が嵩む自動車用の回転速度検出装置付転がり軸受ユ
ニットの場合には、転動体としてテーパころを使用する
場合もある。 【０００５】又、上記ハブ２の中心孔１３に駆動軸１４
を挿通自在とし、この駆動軸１４の外周面とこの中心孔
１３の内周面とをスプライン係合自在としている。自動
車の走行時には、この駆動軸１４の内端部に設けた、等
速ジョイントを構成する等速ジョイント用ハウジング１
５を介して、この駆動軸１４を回転駆動する。 【０００６】一方、上記内輪３の内端部で前記第二の内
輪軌道９から外れた部分の外周面と、上記外輪１の内端
部内周面との間には、組シール１６を設けて、上記円筒
状空間１２の内端開口を塞いでいる。この組シール１６
は、上記内輪３の内端部に外嵌固定した回転側シールリ
ング１７と、上記外輪１の内端部に内嵌固定した固定側
シールリング１８とから成る。又、これら各シールリン
グ１７、１８は、それぞれが断面Ｌ字形で円環状に造っ
た芯金１９ａ、１９ｂと、これら各芯金１９ａ、１９ｂ
にそれぞれの基端部を結合した弾性材２０ａ、２０ｂと
を備える。そして、上記各弾性材２０ａ、２０ｂの先端
縁を、相手側のシールリング１８、１７を構成する芯金
１９ｂ、１９ａに、それぞれ摺接させている。 【０００７】これら１対のシールリング１７、１８のう
ち、回転側シールリング１７を構成する芯金１９ａの内
側面（図１の右側面）をエンコーダ２１としている。こ
のエンコーダ２１は、鋼板等の磁性材により円輪状に造
った板材の外周縁部に複数の切り欠き２２、２２を、円
周方向に関して等間隔で形成する事により全体を櫛歯状
に形成し、磁気特性を円周方向に関して交互に且つ等間
隔に変化させている。 【０００８】一方、上記外輪４の内端部外周面に、金属
板をプレス成形する事により、断面が略Ｌ字形で全体を
円環状に造った、請求項に記載したセンサホルダに相当
するカバー２３を外嵌固定している。そして、このカバ
ー２３の内側に回転速度センサ２４を支持している。こ
の回転速度センサ２４は、断面矩形で全体を円弧状に形
成した合成樹脂２５に包埋した状態で、上記カバー２３
の円周方向一部に形成した保持部分２６に内嵌固定して
いる。そして、この状態で上記回転速度センサ２４の検
出部を、上記エンコーダ２１の被検出部である、軸方向
内側面の周方向一部に、微小隙間２７を介して対向させ
ている。 【０００９】上記回転速度センサ２４は、軸方向（図６
の左右方向）に亙って着磁した永久磁石２８と、ホール
ＩＣ、磁気抵抗素子等の磁気検出素子２９とから成る。
そして、上記回転速度センサ２４の信号を取り出す為の
ハーネス３０を、上記保持部分２６から円周方向に外れ
た部分に設けたハーネス取り出し部３１から、上記カバ
ー２３外に取り出している。 【００１０】このカバー２３の内端部内周面には第二の
シールリング３２を、全周に亙り添設している。そし
て、前記ハブ２の中心孔１３に前記駆動軸１４を挿通し
た状態で、この駆動軸１４の一部外周面と、前記等速ジ
ョイント用ハウジング１５の肩部外側面とに、上記第二
のシールリング３２の先端縁を摺接させる様にしてい
る。 【００１１】上述の様に構成する前記公報に記載された
回転速度検出装置付転がり軸受ユニットによれば、上記
ハブ２に固定した車輪を、前記外輪１を支持した懸架装
置に対し回転自在に支持できる。又、車輪の回転に伴っ
てハブ２の内端部に外嵌固定した内輪３と共にエンコー
ダ２１が回転すると、回転速度センサ２４の磁気検出素
子２９に送られる磁束の密度が変化する為、この回転速
度センサ２４の抵抗値や出力電圧が変化する。 【００１２】この様に、回転速度センサ２４の抵抗値、
或は出力電圧が変化する周波数は、上記車輪の回転速度
に比例する。この為、上記回転速度センサ２４の出力信
号を図示しない制御器に入力すれば、上記車輪の回転速
度を求め、ＡＢＳやＴＣＳを適切に制御できる。 【００１３】又、図６〜７に示した従来構造の場合、カ
バー２３の内周面の内端部に第二のシールリング３２を
添設し、この第二のシールリング３２の先端縁を、駆動
軸１４の基端部外周面と、等速ジョイント用ハウジング
１５の外側面とに、全周に亙り摺接自在としている。こ
の為、回転速度検出装置付転がり軸受ユニットの使用時
に、上記カバー２３の内周面と上記駆動軸１４の外周面
との間を通じて、上記エンコーダ２１の内側面と回転速
度センサ２４の検出部との間の隙間２７に、磁性粉末等
の異物が入り込む事を防止できる。従って、この上記カ
バー２３の外側面でこの回転速度センサ２４の永久磁石
２８の近傍に磁性粉末等の異物が付着して、車輪の回転
速度検出の精度が悪化するのを防止できる。 【００１４】 【発明が解決しようとする課題】上述の様な回転速度検
出装置付転がり軸受ユニットは、転がり軸受ユニットの
メーカーで造った後、自動車の完成品メーカーに搬送す
る。そして、この完成品メーカーで、ハブ２の中心孔１
３に駆動軸１４を挿通し、この中心孔１３の内周面とこ
の駆動軸１４の外周面とをスプライン係合させる。又、
カバー２３の内周面に結合した第二のシールリング３２
の先端縁を、この駆動軸１４の一部外周面と等速ジョイ
ント用ハウジング１５の外側面とに摺接させる事によ
り、上記エンコーダ２１の内側面と回転速度センサ２４
の検出部との間の隙間２７を密封する。一方、自動車の
完成品メーカーの組立ラインに上記回転速度検出装置付
転がり軸受ユニットを搬送する途中等を含む、この自動
車の完成品メーカーで上記中心孔１３の内側に上記駆動
軸１４を挿通する以前の状態では、上記エンコーダ２１
の内側面と回転速度センサ２４の検出部との間の隙間２
７が外部から密封されず、この隙間２７に異物が侵入す
る可能性がある。この様にこの隙間２７に異物が侵入し
た場合には、回転速度センサ２４の検出精度が悪化する
可能性がある。特に、図６〜７に示した様に、回転速度
センサ２４が磁気を利用して回転速度の検出を行なうも
のである場合には、上記隙間２７内に磁性粉末が侵入し
た場合に、上記回転速度センサ２４の検出精度が悪化し
易くなる。尚、図６〜７で示した構造の場合、回転速度
センサ２４に永久磁石２８を組み込んでいる為、上記隙
間内に磁性粉末等の異物が進入すると、上記カバー２３
の外側面で上記永久磁石２８の近傍に上記異物が付着す
る可能性がある。これに対して、回転速度センサに永久
磁石を設けず、円周方向に関して交互に異なる方向に着
磁した永久磁石により、エンコーダを構成する構造も知
られている。この場合には、上記隙間２７内に磁性粉末
等の異物が進入した場合に、上記エンコーダを構成する
永久磁石の側面にこの異物が付着する事により、回転速
度センサの検出精度が悪化する可能性がある。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
情に鑑みて発明したものである。 【００１５】 【課題を解決する為の手段】本発明の回転速度検出装置
付転がり軸受ユニットは、前述の図６〜７に示した従来
構造と同様に、外周面に懸架装置に取り付ける為の第一
のフランジを、内周面に外輪軌道を、それぞれ有し、使
用時にも回転しない外輪と、外周面の外端寄り部分に車
輪を支持する為の第二のフランジを、同じく中間部に上
記外輪軌道と対向する内輪軌道を、それぞれ有し、中心
孔に挿通された駆動軸により使用時に回転駆動される内
輪相当部材と、上記外輪軌道と内輪軌道との間に転動自
在に設けられた複数個の転動体と、上記内輪相当部材の
内端部外周面で上記内輪軌道から外れた部分に、この内
輪相当部材と同心に支持された、被検出部の円周方向に
関する特性を交互に且つ等間隔に変化させたエンコーダ
と、上記外輪の内端部でこのエンコーダに対向する部分
に固定されたセンサホルダと、このセンサホルダに支持
されて、このエンコーダの被検出部にその検出部を対向
させた回転速度センサとを備える。 【００１６】特に、本発明の回転速度検出装置付転がり
軸受ユニットに於いては、上記内輪相当部材の内端面
に、上記センサホルダの一部又はこのセンサホルダに支
持した別の部材の一部を、全周に亙って近接対向若しく
は摺接させている。 【００１７】 【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れば、搬送時を含む、内輪相
当部材の中心孔に駆動軸を挿通する以前の状態でも、回
転速度センサの検出部とエンコーダの被検出部との間部
分に、外部から異物が侵入するのを防止でき、回転速度
検出の信頼性向上を図れる。 【００１８】 【発明の実施の形態】図１〜３は、本発明の実施の形態
の第１例を示している。尚、本発明の特徴は、内輪相当
部材の中心孔１３に駆動軸１４を挿通する以前の状態で
も、回転速度センサ２４ａの検出部とエンコーダ３３の
被検出部との間部分に異物が侵入するのを防止して、こ
の回転速度センサ２４ａの検出精度の信頼性向上を図る
べく、センサホルダ３４と内輪相当部材との構造に工夫
した点にある。その他の部分の構造及び作用に関して
は、前述の図６〜７に示した従来構造の場合とほぼ同様
である為、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上記従来構造
と異なる部分の構造を中心に説明する。 【００１９】本例の場合、ハブ２と共に内輪相当部材を
構成する、内輪３の内端部にエンコーダ３３を、この内
輪３と同心に外嵌固定している。このエンコーダ３３
は、支持環３５とエンコーダ本体３６とから成る。この
うちの支持環３５は、ＳＰＣＣ等の磁性金属板にプレス
加工を施す等により、断面Ｌ字形で全体を円環状に形成
している。そして、この支持環３５を、上記内輪３の内
端部に締り嵌めで、この内輪３と同心に外嵌固定してい
る。又、上記エンコーダ本体３６は、例えばフェライト
粉末を混入したゴムを上記支持環３５を構成する円輪部
３７の軸方向内側面に、焼き付け等により添着して成
る。このエンコーダ本体３６は、軸方向に着磁すると共
に、着磁方向を円周方向に関し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３３の被検出部
である、軸方向内側面には、Ｓ極とＮ極とが円周方向に
関して交互に且つ等間隔で配置されている。又、このエ
ンコーダ３３を上記内輪３の内端部に外嵌固定した状態
で、上記エンコーダ本体３６の軸方向内側面と内輪３の
内端面とを、ほぼ同一平面上に位置させている。 【００２０】一方、外輪１の内端部には、シールリング
３８を内嵌固定している。このシールリング３８は、断
面略Ｌ字形で全体を円環状に形成した芯金３９と、この
芯金３９にその基端部を結合した弾性材４０とから成
る。そして、この弾性材４０に設けた３本のシールリッ
プ４１ａ〜４１ｃの先端縁を、上記エンコーダ３３を構
成する支持環３５の外周面及び軸方向外側面に摺接させ
ている。この構成により、複数の玉１０、１０を設置し
た円筒状空間１２の内端開口を塞いでいる。 【００２１】又、上記外輪１の内端部は、上記内輪３の
内端面よりも１mm程度軸方向内方に突出させている。そ
して、この外輪１の内端部に、円環状のセンサホルダ３
４を被着している。このセンサホルダ３４は、嵌合筒４
２と、この嵌合筒４２に結合固定した保持部４３とを備
える。このうちの嵌合筒４２は、ＳＰＣＣ等の金属板に
プレス加工を施す等により、断面がＬ字形で全体を円環
状に形成したもので、嵌合筒部４４と、この嵌合筒部４
４の基端縁から折れ曲がった内向鍔部４５とを備える。
そして、この内向鍔部４５の内径ｄ45を、上記内輪３の
内端部の外径Ｄ 3 よりも少し小さくしている（ｄ45＜Ｄ
3 ）。又、この内向鍔部４５の一部で、前記エンコーダ
本体３６の内側面の周方向一部と対向する部分に、扇形
等の通孔４６を形成している。 【００２２】又、上記保持部４３は、合成樹脂により円
弧状に形成したもので、前記回転速度センサ２４ａを包
埋している。そして、上記嵌合筒４２を構成する内向鍔
部４５の軸方向内側面（図１、３の右側面）の円周方向
の一部（好ましくは使用時に上端となる部分）に上記保
持部４３を、一体モールド成形により結合固定してい
る。更に、この内向鍔部４５に形成した通孔４６の内側
に、上記保持部４３の一部を進入させている。 【００２３】上記回転速度センサ２４ａ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と、この磁気検出素
子の出力波形を整える為の波形成形回路を組み込んだＩ
Ｃとから成る。この様な回転速度センサ２４ａは、上記
保持部４３に包埋すると共に、その検出部或は配線処理
部分を、上記内向鍔部４５に形成した通孔４６の内側に
進入させている。尚、この内向鍔部４５に上記保持部４
３を結合固定する為に、嵌合筒４２との一体モールド成
形以外の手段を使用する事もできる。例えば、この保持
部４３に上記回転速度センサ２４ａをモールドした後
に、上記内向鍔部４５の軸方向内側面にこのモールドし
たものを、接着等により結合固定する事もできる。 【００２４】又、本例の場合には、上記ＩＣにより成形
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３０を、上記保持部４３の表面のうち、
上記センサホルダ３４の円周方向片端面（図２の右端
面）から、この保持部４３外に取り出している。 【００２５】上述の様に構成するセンサホルダ３４は、
前記嵌合筒４２を上記外輪１の内端部に、締り嵌めによ
り、前記内輪３と同心に外嵌固定している。又、上記嵌
合筒４２を構成する内向鍔部４５の軸方向外側面を、上
記外輪１の内端面に突き当てている。前述した様に、こ
の外輪１の内端部は上記内輪３の内端面よりも１mm程度
軸方向内方に突出させており、しかも、上記内向鍔部４
５の内径ｄ45を上記内輪３の内端部の外径Ｄ3 よりも少
し小さくしている。この為、この内輪３の内端面の外径
寄り部分と、上記内向鍔部４５の軸方向外側面の内径寄
り部分とが、１mm程度の厚さを有する微小隙間４７を介
して、全周に亙り近接対向する。そして、この微小隙間
４７により、ラビリンスシールが構成される。尚、この
微小隙間４７の厚さは、使用時に於ける各部の弾性変形
を考慮しつつ精度上許される限り、（１mm若しくはそれ
よりも）小さい事が好ましい。又、この状態で、上記回
転速度センサ２４ａの検出部と前記エンコーダ本体３６
の軸方向内側面の周方向一部とを、微小隙間２７を介し
て対向させている。 【００２６】更に、本例の場合には、上記センサホルダ
３４の嵌合筒４２を構成する内向鍔部４５の円周方向の
一部で使用時に下端となる部分に排出孔４９（図２）を
形成すると共に、この排出孔４９の下端縁をこの外輪１
の下端部内周面よりも下側に位置させている。 【００２７】一方、回転速度検出装置付転がり軸受ユニ
ットを自動車に組み付ける場合には、前記ハブ２の中心
孔１３の内側に駆動軸１４を挿通する（スプライン係合
させる）と共に、この駆動軸１４の中間部に設けた大径
部４８の外側面を、上記内輪３の内端面に突き当てる事
により、上記ハブ２に対し上記内輪３がずれ動くのを防
止する。そして、本例の場合には、上記センサホルダ３
４の本体部分の厚さＨ、この内輪３の内端面からの上記
外輪１の内端部の突出量等の、各部の寸法を適切に規制
する事により、この様な自動車への組み付け状態でも、
上記駆動軸１４の内端部に設けた等速ジョイント用ハウ
ジング１５の肩部と、上記センサホルダ３４とが干渉す
るのを防止する。 【００２８】上述の様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、内輪３の内端面の外径寄
り部分と、センサホルダ３４の嵌合筒４２を構成する内
向鍔部４５の軸方向外側面の内径寄り部分とを、全周に
亙り、厚さ（幅）が１mm若しくはそれ以下の微小隙間４
７を介して対向させており、この微小隙間４７によりラ
ビリンスシールを構成している。この為、自動車の完成
品メーカーの組立ラインへの搬送時を含む、ハブ２の中
心孔１３に駆動軸１４を挿通する以前の状態でも、エン
コーダ本体３６の軸方向内側面と回転速度センサ２４ａ
の検出部との間部分に、上記センサホルダ３４の内径側
の空間を通じて、外部から磁性粉末等の異物が侵入する
のを防止できる。従って、車輪の回転速度検出の信頼性
向上を図れる。 【００２９】又、本例の場合には、上記センサホルダ３
４の嵌合筒４２を構成する内向鍔部４５の一部で、使用
時に下端に位置する部分に排出孔４９を形成している。
そして、この排出孔４９の下端縁を、前記外輪１の内周
面の下端部よりも下側に位置させている。従って、万が
一、内輪３の内端面と上記内向鍔部４５の内側面との間
に形成した微小隙間４７等を通じて、エンコーダ３３を
設置した空間内に、雨水等の流動状の異物が侵入した場
合でも、この空間内で重力の作用により流下した流動状
の異物を、上記排出孔４９を通じて外部に排出できる。 【００３０】更に、本例の場合には、センサホルダ３４
の嵌合筒４２を構成する内向鍔部４５の軸方向内側面に
保持部４３を結合固定すると共に、この内向鍔部４５に
形成した通孔４６の内側に回転速度センサ２４ａの検出
部或は配線処理部分を進入させている。この為、上記嵌
合筒４２を構成する内向鍔部４５の軸方向外側面（図
１、３の左側面）に上記保持部４３を、この嵌合筒４２
を構成する嵌合筒部４４の内側に設ける状態で結合する
場合よりも、上記センサホルダ３４の本体部の、前記外
輪１の内端面からの突出量（図示の場合にはこの本体部
の厚さＨと同じ）を小さくできる。即ち、上記保持部４
３に、回転速度センサ２４ａとこの回転速度センサ２４
ａに接続したハーネス３０の端部とを包埋する為には、
この保持部４３の少なくとも一部の厚さを所定寸法以上
にする必要がある。しかも、上記内向鍔部４５の軸方向
外側面に上記保持部４３を結合する場合には、上記セン
サホルダ３４を設置した部分の上記外輪１の内端面から
の突出量が、上記保持部４３の厚さＨに上記内向鍔部４
５の厚さＴを加えた寸法以上（≧Ｈ＋Ｔ）になる。これ
に対して本例の場合には、この内向鍔部４５の軸方向内
側面に上記保持部４３を結合固定すると共に、この内向
鍔部４５に形成した通孔４６の内側に上記回転速度セン
サ２４ａの一部を進入させている。この為、上記センサ
ホルダ３４の本体部分の上記外輪１の内端面からの突出
量が、この本体部分の厚さＨのみとなる。従って、上記
内向鍔部４５の軸方向外側面に上記保持部４３を結合す
る場合よりも、上記センサホルダ３４の本体部分の厚さ
Ｈを、上記内向鍔部４５の厚さＴ分小さくできる。この
結果、上記センサホルダ３４と前記等速ジョイント用ハ
ウジング１５との干渉を防止し易くできる。 【００３１】又、本例の場合には、上記回転速度センサ
２４ａに接続したハーネス３０を、上記保持部４３の側
面のうち、上記センサホルダ３４の円周方向端面から、
この保持部４３外に取り出している。従って、この保持
部４３から導出されたハーネス３０が、上記等速ジョイ
ント用ハウジング１５や駆動軸１４に近づくのを防止で
き、このハーネス３０とこれら各部１５、１４とが干渉
するのを防止できる。 【００３２】次に、図４〜５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、上述した第１例
の場合と異なり、ハブ２の内端部を、内輪３の内端面よ
りも軸方向内方に突出させている。そして、この突出さ
せた部分を径方向外側に全周に亙って塑性変形させる事
により、このハブ２の内端部にかしめ部５０を形成して
いる。そして、このかしめ部５０により、上記内輪３の
内端面を抑え付けて、上記ハブ２からこの内輪３が脱落
するのを防止している。 【００３３】特に、本例の場合には、センサホルダ３４
の嵌合筒４２を構成する内向鍔部４５の内周縁部に、ゴ
ムの如きエラストマーから成る弾性材５１を、全周に亙
り結合している。そして、上記内輪３の内端面で上記か
しめ部５０よりも外径側に外れた部分に、この弾性材５
１の内周縁を、全周に亙り摺接させている。 【００３４】上述の様に構成する本例の場合には、上述
した第１例の場合よりも、エンコーダ３３の軸方向内側
面と回転速度センサ２４ａの検出部との間部分への異物
の侵入防止を、より確実に図れる。その他の構成及び作
用に就いては、上述した第１例の場合と同様である為、
同等部分には同一符号を付して、重複する説明は省略す
る。 【００３５】尚、上述した各例の場合には、エンコーダ
３３として、支持環３５の軸方向内側面に、Ｓ極とＮ極
とを円周方向に関して交互に配置したエンコーダ本体３
６を結合したものを使用している。但し、本発明は、こ
の様なエンコーダ３３を使用する構造に限定するもので
はない。例えば、ＳＰＣＣの如き炭素鋼板等の磁性金属
板により円輪状に造った板材の円周方向等間隔位置に複
数の切り欠き若しくは透孔を形成して成るエンコーダ本
体を、支持環の軸方向内側面に結合したエンコーダを使
用する事もできる。尚、この様なエンコーダを使用する
場合には、このエンコーダに対向させる回転速度センサ
として、例えば永久磁石とポールピースとコイルとを備
えたものを使用する。又、エンコーダとセンサとから成
る回転速度検出装置の構造は、磁気センサを使用したも
のに限らず、渦電流式、光電式等のセンサを用いるもの
も、本発明の対象となる。但し、エンコーダとして永久
磁石を使用したものは、磁性材製の異物が付着したまま
となり易い事から、本発明を適用する事の重要性は大き
い。 【００３６】又、上述した各例の場合には、ハブ２の中
間部外周面に第一の内輪軌道７を直接形成しているが、
本発明は、この様な構造に限定するものでもない。例え
ば、ハブ２の中間部外周面に形成した円筒面に、その外
周面に第一の内輪軌道を形成した、別体の内輪を外嵌固
定した構造で、本発明を実施する事もできる。 【００３７】 【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、
内輪相当部材の中心孔に駆動軸を挿通する以前の状態で
も、回転速度センサの検出部とエンコーダの被検出部と
の間部分に、外部から異物が侵入するのを防止でき、回
転速度検出の信頼性向上を図れる。DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention
Rolling bearing unit with device for suspending the wheels of an automobile
And the rotation speed of this wheel.
Used to detect degrees. [0002] 2. Description of the Related Art The wheels of an automobile rotate with respect to a suspension device.
A rolling bearing unit is used for the support.
Also, anti-lock brake system (ABS) or truck
To control the traction control system (TCS)
Needs to detect the rotational speed of the wheels. Because of this,
A rotation speed detector is incorporated in the above rolling bearing unit.
Rolling bearing unit with rotating speed detector
While supporting the wheels rotatably with respect to the suspension,
Detecting the rotational speed of the wheel of a vehicle has been widely performed in recent years
It is like. [0003] A rotation speed detecting device used for such a purpose.
As an example of a mounted rolling bearing unit, see Japanese Unexamined Patent Application Publication No. 9-21
No. 822 discloses a structure as shown in FIGS.
ing. With this conventionally known rotation speed detection device
Rolling bearing unit is supported and fixed to a suspension device (not shown)
On the inner diameter side of the outer ring 1 that does not rotate during use.
Can rotate the hub 2 and the inner ring 3 constituting the inner ring equivalent member
I support it. That is, the outer race 1 is provided on the outer peripheral surface.
A first flange 4 for attaching the wheel 1 to the suspension,
The inner peripheral surface has multiple rows of outer raceways 5, 5, respectively.
The hub 2 is located outside the outer peripheral surface (with respect to the axial direction,
Outside of the vehicle in the width direction when the vehicle is assembled. Same here
Same. Left side of each figure except FIGS. ) Wheels near the edge
Is provided with a second flange 6 for supporting the second flange 6. Also, above
A first inner raceway 7 is formed at an intermediate portion of the outer peripheral surface of the hub 2
And the same (with respect to the axial direction,
In the center of the vehicle in the width direction. Same here. Figures 2 and 7
Excluding the right side of each figure. ) Small diameter step 8 formed near the end
The inner ring having a second inner ring raceway 9 formed on its outer peripheral surface.
3 is fitted outside. Further, each of the outer raceways 5, 5 and each of the inner raceways 5
Between the roads 7 and 9, a plurality of rolling elements 1
0 and 10 are provided rotatably, and the inner ring side of the outer ring 1 is
The hub 2 and the inner ring 3 are rotatably supported. Also, above
Between the outer end opening of the outer ring 1 and the outer peripheral surface of the intermediate portion of the hub 2
A first seal ring 11 is provided therebetween. This first
The seal ring 11 is a cylinder on which the balls 10 and 10 are installed.
The outer end opening of the cylindrical space 12 is closed, and the inside of the cylindrical space 12 is closed.
Grease leaks out or foreign matter present outside
From entering the cylindrical space 12. still,
In the illustrated example, a ball is used as the rolling element 10,
Rolling bearing unit with rotation speed detector for heavy vehicles
For knits, use tapered rollers as rolling elements
In some cases. A drive shaft 14 is provided in the center hole 13 of the hub 2.
And the outer peripheral surface of the drive shaft 14 and the center hole
13 is made spline-engageable with the inner peripheral surface. Automatic
When the vehicle is running, it is provided at the inner end of the drive shaft 14.
Constant velocity joint housing 1 constituting a speed joint
The drive shaft 14 is rotationally driven through the drive shaft 5. On the other hand, the inner end of the inner ring 3
An outer peripheral surface of a portion deviating from the ring raceway 9 and an inner end of the outer ring 1
A set seal 16 is provided between the inner circumferential surface and the cylindrical inner surface.
The inner end opening of the space 12 is closed. This set seal 16
Is a rotary seal that is externally fitted and fixed to the inner end of the inner ring 3.
17 and a fixed side internally fixed to the inner end of the outer ring 1.
And a seal ring 18. In addition, each of these seal phosphorus
Each of the rings 17 and 18 is formed in an annular shape with an L-shaped cross section.
Core metals 19a, 19b, and the respective core metals 19a, 19b
Elastic members 20a and 20b having their respective base ends connected to
Is provided. And the tip of each of the elastic members 20a and 20b
The edge is a core metal that constitutes the seal rings 18 and 17 on the other side.
19b and 19a are in sliding contact with each other. The pair of seal rings 17, 18
That is, of the core metal 19a constituting the rotation-side seal ring 17,
The side surface (the right side surface in FIG. 1) is an encoder 21. This
Encoder 21 is made of a magnetic material such as a steel plate into an annular shape.
A plurality of notches 22, 22 are formed in the outer peripheral edge of the
Comb-shaped by forming at equal intervals in the circumferential direction
And magnetic properties are alternately and equally spaced in the circumferential direction.
It has been changed to the interval. On the other hand, the outer peripheral surface of the outer
By pressing the plate, the cross section is almost L-shaped and the whole
Corresponds to the sensor holder described in the claims, made in an annular shape
The cover 23 to be fitted is externally fixed. And this hippo
, A rotation speed sensor 24 is supported inside. This
Of the rotation speed sensor 24 is rectangular in cross section and the whole is formed in an arc shape.
The cover 23 is embedded in the formed synthetic resin 25.
To the holding portion 26 formed in a part of the circumferential direction of
I have. In this state, the rotation speed sensor 24 detects
The protruding part is the detected part of the encoder 21,
A part of the inner surface in the circumferential direction is opposed via a minute gap 27.
ing. The rotation speed sensor 24 is arranged in the axial direction (FIG. 6).
Of the permanent magnet 28 magnetized over the
And a magnetic detecting element 29 such as an IC and a magnetic resistance element.
Then, for extracting the signal of the rotation speed sensor 24,
Disconnect the harness 30 from the holding portion 26 in the circumferential direction.
From the harness take-out part 31
-23 taken out. On the inner peripheral surface of the inner end of the cover 23, a second
A seal ring 32 is provided over the entire circumference. Soshi
Then, the drive shaft 14 is inserted into the center hole 13 of the hub 2.
In this state, a part of the outer peripheral surface of the drive shaft 14 is
The outer surface of the shoulder of the joint housing 15 and the second
To make the leading edge of the seal ring 32 slide.
You. [0011] The above-mentioned publication having the structure described above
According to the rolling bearing unit with the rotation speed detecting device,
A suspension device supporting the wheel fixed to the hub 2 and supporting the outer ring 1
It can be supported rotatably with respect to the installation. Also, with the rotation of the wheels
With the inner ring 3 externally fitted and fixed to the inner end of the hub 2
When the rotor 21 rotates, the magnetic detection element of the rotation speed sensor 24
Since the density of the magnetic flux sent to the element 29 changes, this rotation speed
The resistance value and output voltage of the degree sensor 24 change. As described above, the resistance value of the rotation speed sensor 24,
Alternatively, the frequency at which the output voltage changes is the rotational speed of the wheel
Is proportional to Therefore, the output signal of the rotation speed sensor 24 is
Signal is input to a controller (not shown).
The degree can be obtained and ABS and TCS can be controlled appropriately. In the case of the conventional structure shown in FIGS.
A second seal ring 32 is provided on the inner end of the inner peripheral surface of the bar 23.
The tip of the second seal ring 32 is
Outer peripheral surface of base end of shaft 14 and housing for constant velocity joint
The outer surface 15 is freely slidable over the entire circumference. This
Therefore, when using a rolling bearing unit with a rotation speed detection device
The inner peripheral surface of the cover 23 and the outer peripheral surface of the drive shaft 14
Between the inner surface of the encoder 21 and the rotational speed.
Magnetic powder or the like in the gap 27 between
Foreign matter can be prevented from entering. Therefore, this
The permanent magnet of the rotation speed sensor 24 is
Foreign matter, such as magnetic powder, adheres to the vicinity of
It is possible to prevent the accuracy of speed detection from deteriorating. [0014] SUMMARY OF THE INVENTION The rotational speed detection as described above is performed.
The rolling bearing unit with an extension device is the same as the rolling bearing unit.
After being built by the manufacturer, it is transported to the finished car manufacturer
You. And in this finished product manufacturer, the center hole 1 of the hub 2
3 through the drive shaft 14, and the inner peripheral surface of the center hole 13
Of the drive shaft 14 is spline-engaged. or,
Second seal ring 32 connected to the inner peripheral surface of cover 23
Of the drive shaft 14 at a constant velocity
By sliding on the outer surface of the housing 15
The rotation speed sensor 24 and the inner surface of the encoder 21
The gap 27 between the detecting part and the detecting part is sealed. On the other hand,
Equipped with the above rotation speed detector on the assembly line of the finished product manufacturer
This automatic, including during the transportation of the rolling bearing unit,
The above-mentioned drive inside the center hole 13 in the finished car manufacturer
Before the shaft 14 is inserted, the encoder 21
2 between the inner surface of the motor and the detection unit of the rotation speed sensor 24
7 is not sealed from the outside, and foreign matter enters the gap 27.
May be As described above, foreign matter enters the gap 27 and
In such a case, the detection accuracy of the rotation speed sensor 24 deteriorates.
there is a possibility. In particular, as shown in FIGS.
The sensor 24 detects the rotational speed using magnetism.
In this case, the magnetic powder enters the gap 27 and
In this case, the detection accuracy of the rotation speed sensor 24 is deteriorated.
It will be easier. In the case of the structure shown in FIGS.
Since the permanent magnet 28 is incorporated in the sensor 24,
When foreign matter such as magnetic powder enters the space, the cover 23
The foreign matter adheres near the permanent magnet 28 on the outer surface of the
May be On the other hand, the rotation speed sensor
Without magnets, wear in alternate directions in the circumferential direction.
The structure that composes the encoder with magnetized permanent magnets is also known.
Have been. In this case, the magnetic powder
Configures the above encoder when foreign matter such as
This foreign matter adheres to the side surface of the permanent magnet,
There is a possibility that the detection accuracy of the degree sensor is deteriorated. Of the present invention
The rolling bearing unit with rotation speed detector
It was invented in view of circumstances. [0015] SUMMARY OF THE INVENTION A rotational speed detecting device according to the present invention.
The rolling bearing unit is a conventional rolling bearing unit shown in FIGS.
Like the structure, the first to attach to the suspension on the outer peripheral surface
Of the outer ring raceway on the inner peripheral surface.
The outer ring that does not rotate during use and the car near the outer end of the outer peripheral surface
Place a second flange to support the wheel, also in the middle
Each having an inner raceway facing the outer raceway,
Driven in use by the drive shaft inserted in the hole
Between the outer ring raceway and the inner raceway,
A plurality of rolling elements provided in the
At the part of the outer peripheral surface of the inner end that deviates from the inner raceway,
In the circumferential direction of the part to be detected, supported concentrically with the ring equivalent member
With the characteristics related to each other alternately and at equal intervals
And a portion facing the encoder at the inner end of the outer ring
Sensor holder fixed to and supported by this sensor holder
And the detection part faces the detection part of this encoder.
And a rotation speed sensor. In particular, rolling with a rotation speed detecting device of the present invention
In the bearing unit, the inner end surface of the inner ring equivalent member
In addition, a part of the above-mentioned sensor holder or a support
A part of another member that is held close to the entire circumference
Is in sliding contact. [0017] According to the present invention, the rotational speed detecting device of the present invention is constructed as described above.
According to the rolling bearing unit, the inner race
Even before the drive shaft is inserted through the center hole of this member,
Between the detecting part of the speed sensor and the detected part of the encoder
Per minute to prevent foreign matter from entering,
The reliability of detection can be improved. [0018] 1 to 3 show an embodiment of the present invention.
1 shows a first example. It should be noted that the feature of the present invention is equivalent to the inner ring
Before the drive shaft 14 is inserted through the center hole 13 of the member
Also, the detection unit of the rotation speed sensor 24a and the encoder 33
This prevents foreign matter from entering the area between the
To improve the reliability of the detection accuracy of the rotational speed sensor 24a
The structure of the sensor holder 34 and the member equivalent to the inner ring
It is in the point which did. Regarding the structure and operation of other parts
Is almost the same as that of the conventional structure shown in FIGS.
Therefore, the same parts are denoted by the same reference numerals, and the description will be duplicated.
Are omitted, and the features of the present invention and the above-described conventional structure will be described below.
The following description focuses on the structure of the different part. In the case of the present embodiment, an inner ring equivalent member is mounted together with the hub 2.
An encoder 33 is provided at the inner end of the inner ring 3,
The outer fitting is fixed concentrically with the ring 3. This encoder 33
Comprises a support ring 35 and an encoder body 36. this
The support ring 35 is pressed on a magnetic metal plate such as SPCC.
By processing, the whole is formed in an annular shape with an L-shaped cross section
are doing. Then, this support ring 35 is attached to the inside of the inner ring 3.
The outer ring is fitted and fixed concentrically with the inner ring 3 by tight fitting at the end.
You. The encoder body 36 is made of, for example, ferrite.
A ring part constituting the support ring 35 is formed by mixing rubber mixed with powder.
37 is attached to the inner surface in the axial direction by baking or the like.
You. This encoder body 36 is magnetized in the axial direction and
The magnetization direction is alternately changed at regular intervals in the circumferential direction.
It is making it. Therefore, the detected part of the encoder 33
On the inner surface in the axial direction, the S pole and the N pole are arranged in the circumferential direction.
Are arranged alternately and at equal intervals. Also, this d
The encoder 33 is externally fitted and fixed to the inner end of the inner ring 3.
Thus, the axial inner surface of the encoder body 36 and the inner ring 3
The inner end face is located on substantially the same plane. On the other hand, a seal ring is provided on the inner end of the outer race 1.
38 is fixed inside. This seal ring 38 is
A metal core 39 having a substantially L-shaped surface and formed entirely in an annular shape,
An elastic member 40 having a base end coupled to a cored bar 39.
You. Then, the three seal lids provided on the elastic member 40 are provided.
The encoder 33 is connected to the leading edges of the pumps 41a to 41c.
Sliding contact with the outer peripheral surface and the axially outer surface of the support ring 35 formed.
ing. With this configuration, a plurality of balls 10, 10 are installed.
The inner end opening of the cylindrical space 12 is closed. The inner end of the outer race 1 is
It protrudes inward in the axial direction by about 1 mm from the inner end face. So
Then, an annular sensor holder 3 is attached to the inner end of the outer ring 1.
4 is attached. This sensor holder 34 is
2 and a holding portion 43 connected and fixed to the fitting cylinder 42.
I can. The fitting cylinder 42 is formed on a metal plate such as SPCC.
By pressing, etc., the cross section is L-shaped and the whole is annular
The fitting tube portion 44 and the fitting tube portion 4
4 and an inward flange 45 bent from the base end edge.
And the inner diameter d of this inward flange 4545Of the inner ring 3
Outer diameter D of inner end Three Slightly smaller than (d45<D
Three ). In addition, a part of the inward flange 45, the encoder
The part facing the circumferential part of the inner surface of the main body 36 has a sector shape.
Etc. are formed. The holding section 43 is made of a synthetic resin and has a circular shape.
It is formed in an arc shape and encloses the rotational speed sensor 24a.
Buried. The inward flange forming the fitting cylinder 42
Circumferential direction of the inner side surface in the axial direction (the right side surface in FIGS. 1 and 3)
Part (preferably the top part when used)
The holding portion 43 is connected and fixed by integral molding.
You. Furthermore, the inside of the through hole 46 formed in the inward flange portion 45
, A part of the holding portion 43 enters. The rotation speed sensor 24a is a Hall element.
Element, magnetoresistive element (MR element), etc.
A magnetic sensing element that changes its characteristics
I incorporating a waveform shaping circuit for adjusting the output waveform of the slave
C. Such a rotational speed sensor 24a is
While being embedded in the holding unit 43, the detection unit or the wiring process
Part inside the through hole 46 formed in the inward flange 45.
Have been entered. The holding portion 4 is attached to the inward flange 45.
3 is integrally molded with the fitting cylinder 42 in order to fix the same.
Means other than shape can also be used. For example, this hold
After molding the rotation speed sensor 24a in the part 43
Then, the mold is formed on the inner surface of the inward flange 45 in the axial direction.
Can be fixed by bonding or the like. Also, in the case of this example, molding by the above IC
Output signal that is output as a
Harness 30 for holding
One end surface in the circumferential direction of the sensor holder 34 (right end in FIG. 2)
Surface) and taken out of the holding portion 43. The sensor holder 34 configured as described above is
The fitting cylinder 42 is fitted to the inner end of the outer race 1 by interference fitting.
The outer ring is fixed concentrically with the inner ring 3. In addition,
The outer side surface in the axial direction of the inward flange portion 45 constituting the
The outer ring 1 is in contact with the inner end face. As mentioned earlier,
The inner end of the outer ring 1 is about 1 mm larger than the inner end face of the inner ring 3
Projecting inward in the axial direction;
Inner diameter d of 545Is the outer diameter D of the inner end of the inner ring 3Three Less than
And make it smaller. Therefore, the outer diameter of the inner end face of the inner ring 3
The deviated portion and the inner diameter of the axially outer surface of the inward flange 45.
And a small gap 47 having a thickness of about 1 mm
As a result, they oppose each other over the entire circumference. And this small gap
47 constitutes a labyrinth seal. In addition, this
The thickness of the minute gap 47 depends on the elastic deformation of each part during use.
(1 mm or more)
Is preferable. In this state,
Detecting section of rotation speed sensor 24a and encoder main body 36
And a part in the circumferential direction of the inner surface in the axial direction of
Facing each other. Further, in the case of this embodiment, the sensor holder
34 of the inward flange 45 constituting the fitting cylinder 42 in the circumferential direction.
A discharge hole 49 (FIG. 2) is provided at the lower end when used.
And the lower edge of the discharge hole 49 is connected to the outer ring 1.
Is located lower than the inner peripheral surface of the lower end of the. On the other hand, a rolling bearing unit with a rotation speed detecting device
When mounting the kit to the car, the center of the hub 2
Drive shaft 14 is inserted into hole 13 (spline engagement).
And a large diameter provided in the intermediate portion of the drive shaft 14.
Butting the outer surface of the part 48 against the inner end surface of the inner ring 3
Prevents the inner ring 3 from moving relative to the hub 2.
Stop. In the case of this example, the sensor holder 3
4, the thickness H of the main body portion,
Properly regulate the dimensions of each part, such as the amount of protrusion of the inner end of the outer ring 1
By doing so, even in such an assembled state to the car,
Constant velocity joint housing provided at the inner end of the drive shaft 14
The shoulder of the jing 15 and the sensor holder 34 interfere with each other.
To prevent As described above, the rotation with the rotation speed detecting device of the present invention
In the case of a ball bearing unit, the outer diameter of the inner end face of the inner ring 3
Inside the fitting cylinder 42 of the sensor holder 34
The part close to the inner diameter of the axial outer surface of the facing flange 45 is
Over a minute gap 4 with a thickness (width) of 1 mm or less
7 and the small gap 47
It constitutes a virinth seal. For this reason, the completion of the car
Inside the hub 2, including during transportation to the assembly line of the product manufacturer
Even before the drive shaft 14 is inserted through the mandrel 13,
Axial inner surface of coder body 36 and rotational speed sensor 24a
At the inner side of the sensor holder 34,
Foreign matter such as magnetic powder enters from outside through the space
Can be prevented. Therefore, the reliability of wheel speed detection
Can be improved. In the case of this embodiment, the sensor holder 3
And a part of the inward flange 45 constituting the fitting cylinder 42
A discharge hole 49 is formed in a portion located at the lower end sometimes.
The lower edge of the discharge hole 49 is connected to the inner periphery of the outer race 1.
It is located below the lower end of the surface. Therefore,
First, between the inner end surface of the inner ring 3 and the inner surface of the inward flange 45.
The encoder 33 through the minute gap 47 formed in
If a foreign substance, such as rainwater, enters the installed space.
Even in this case, the fluid flowing down by the action of gravity in this space
Can be discharged to the outside through the discharge hole 49. Further, in the case of this embodiment, the sensor holder 34
On the axially inner surface of the inward flange 45 constituting the fitting cylinder 42 of FIG.
The holding portion 43 is connected and fixed, and the inward flange portion 45 is
Detection of the rotational speed sensor 24a inside the formed through hole 46
Section or wiring processing section. For this reason,
The axially outer side surface of the inward flange portion 45 constituting the joint tube 42 (see FIG.
The holding portion 43 is attached to the fitting cylinder 42
In a state of being provided inside the fitting tubular portion 44 constituting
Than the case, the main body of the sensor holder 34
The amount of protrusion from the inner end surface of the wheel 1
(The same as the thickness H). That is, the holding unit 4
3, the rotation speed sensor 24a and the rotation speed sensor 24
To embed the end of the harness 30 connected to a
The thickness of at least a part of the holding portion 43 is equal to or more than a predetermined size.
Need to be Moreover, the axial direction of the inward flange 45
When connecting the holding portion 43 to the outer side surface,
From the inner end surface of the outer ring 1 at the portion where the holder 34 is installed
The protrusion amount of the inward flange portion 4 corresponds to the thickness H of the holding portion 43.
5 or more (≧ H + T). this
On the other hand, in the case of this example,
The holding portion 43 is fixedly connected to the side surface, and
The rotation speed sensor is provided inside a through hole 46 formed in the flange 45.
A part of the support 24a is entered. For this reason, the above sensor
Projection of the main body of the holder 34 from the inner end surface of the outer ring 1
The amount is only the thickness H of the main body. Therefore,
The holding portion 43 is connected to the axially outer surface of the inward flange portion 45.
Than the thickness of the main body of the sensor holder 34
H can be reduced by the thickness T of the inward flange 45. this
As a result, the sensor holder 34 and the constant velocity joint
Interference with the housing 15 can be easily prevented. In the case of this embodiment, the rotational speed sensor
The harness 30 connected to the holding portion 43a is
Of the surfaces, from the circumferential end surface of the sensor holder 34,
It is taken out of the holding portion 43. Therefore, this hold
The harness 30 derived from the part 43 is
To prevent it from approaching the housing 15 and the drive shaft 14.
The harness 30 and these parts 15 and 14 interfere with each other.
Can be prevented. Next, FIGS. 4 and 5 show an embodiment of the present invention.
A second example is shown. In the case of this example, the first example described above
Unlike the case of, the inner end of the hub 2 is
And project inward in the axial direction. And this protrusion
Plastic deformation of the exposed part radially outward over the entire circumference
As a result, a caulked portion 50 is formed at the inner end of the hub 2.
I have. The caulking part 50 allows the inner ring 3
The inner ring 3 comes off from the hub 2 by holding down the inner end face.
Is prevented from doing so. In particular, in the case of this embodiment, the sensor holder 34
The inner peripheral edge of the inward flange 45 constituting the fitting cylinder 42 of FIG.
An elastic material 51 made of an elastomer such as
Are connected. Then, the inner ring 3
The elastic material 5 is provided at a portion outside the outer diameter side from the tightening portion 50.
The inner peripheral edge of the roller 1 is slid over the entire circumference. In the case of this example configured as described above,
Axially inner side of the encoder 33 than in the case of the first example
Foreign matter on the part between the surface and the detection part of the rotation speed sensor 24a
Can be more reliably prevented. Other configurations and works
Since the operation is the same as the case of the first example described above,
Equivalent parts are denoted by the same reference numerals, and duplicate description is omitted.
You. In each of the above examples, the encoder
33, an S pole and an N pole
Encoder body 3 in which are arranged alternately in the circumferential direction
6 is used. However, the present invention
It is limited to the structure using the encoder 33 like
There is no. For example, magnetic metal such as carbon steel sheet such as SPCC
At the circumferentially equal position of the plate material
Encoder book with a number of notches or through holes
Use an encoder that connects the body to the axially inner surface of the support ring.
Can also be used. In addition, use such an encoder
In this case, the rotation speed sensor facing this encoder
For example, a permanent magnet, pole piece, and coil
Use the one you obtained. It consists of an encoder and a sensor.
The structure of the rotation speed detection device uses a magnetic sensor.
Not limited to those using sensors such as eddy current type and photoelectric type
Are also an object of the present invention. However, permanent as encoder
For those using a magnet, the magnetic material remains attached
Therefore, it is important to apply the present invention.
No. In each of the above examples, the hub 2
Although the first inner raceway 7 is directly formed on the outer peripheral surface of the intermediate portion,
The present invention is not limited to such a structure. example
For example, the cylindrical surface formed on the outer peripheral surface of the intermediate portion of the hub 2
A separate inner ring with the first inner ring raceway formed on the peripheral surface
The present invention can be implemented with a fixed structure. [0037] The rolling bearing with the rotation speed detecting device of the present invention.
The units are configured and function as described above,
Before inserting the drive shaft into the center hole of the inner ring equivalent member
Also, the detection part of the rotation speed sensor and the detected part of the encoder
Foreign matter can be prevented from entering the space between
The reliability of the rotation speed detection can be improved.

【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、図２のＡ
−Ｏ−Ｏ−Ｂ断面図。 【図２】図１の右方から見た図。 【図３】同Ｃ部拡大断面図。 【図４】本発明の実施の形態の第２例を示す、図１と同
様の図。 【図５】図４のＤ部拡大断面図。 【図６】従来構造の１例を示す、図７のＥ−Ｏ−Ｅ断面
図。 【図７】図６の右方から見た図。 【符号の説明】 １ 外輪 ２ ハブ ３ 内輪 ４ 第一のフランジ ５ 外輪軌道 ６ 第二のフランジ ７ 第一の内輪軌道 ８ 小径段部 ９ 第二の内輪軌道 １０ 転動体 １１ 第一のシールリング １２ 円筒状空間 １３ 中心孔 １４ 駆動軸 １５ 等速ジョイント用ハウジング １６ 組シール １７ 回転側シールリング １８ 固定側シールリング １９ａ、１９ｂ 芯金 ２０ａ、２０ｂ 弾性材 ２１ エンコーダ ２２ 切り欠き ２３ カバー ２４、２４ａ 回転速度センサ ２５ 合成樹脂 ２６ 保持部分 ２７ 微小隙間 ２８ 永久磁石 ２９ 磁気検出素子 ３０ ハーネス ３１ ハーネス取り出し部 ３２ 第二のシールリング ３３ エンコーダ ３４ センサホルダ ３５ 支持環 ３６ エンコーダ本体 ３７ 円輪部 ３８ シールリング ３９ 芯金 ４０ 弾性材 ４１ａ、４１ｂ、４１ｃ シールリップ ４２ 嵌合筒 ４３ 保持部 ４４ 嵌合筒部 ４５ 内向鍔部 ４６ 通孔 ４７ 微小隙間 ４８ 大径部 ４９ 排出孔 ５０ かしめ部 ５１ 弾性材BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A shows a first example of an embodiment of the present invention, and FIG.
-OOB sectional drawing. FIG. 2 is a view seen from the right side of FIG. 1; FIG. 3 is an enlarged sectional view of part C of FIG. FIG. 4 is a view similar to FIG. 1, showing a second example of the embodiment of the present invention. FIG. 5 is an enlarged sectional view of a part D in FIG. 4; FIG. 6 is a cross-sectional view taken along the line EOE of FIG. 7, showing an example of a conventional structure. FIG. 7 is a view seen from the right side of FIG. 6; [Description of Signs] 1 Outer ring 2 Hub 3 Inner ring 4 First flange 5 Outer ring track 6 Second flange 7 First inner ring track 8 Small diameter step 9 Second inner ring track 10 Rolling element 11 First seal ring 12 Cylindrical space 13 Center hole 14 Drive shaft 15 Constant velocity joint housing 16 Assembly seal 17 Rotation side seal ring 18 Fixed side seal ring 19a, 19b Cores 20a, 20b Elastic material 21 Encoder 22 Notch 23 Cover 24, 24a Rotation speed Sensor 25 Synthetic resin 26 Holding part 27 Micro gap 28 Permanent magnet 29 Magnetic detection element 30 Harness 31 Harness take-out part 32 Second seal ring 33 Encoder 34 Sensor holder 35 Support ring 36 Encoder body 37 Ring part 38 Seal ring 39 Core 40 elastic members 41a, 41b, 41c seal lip 42 fitting cylinder 43 Holding part 44 Fitting cylinder part 45 Inward flange part 46 Through hole 47 Micro gap 48 Large diameter part 49 Discharge hole 50 Caulking part 51 Elastic material

フロントページの続き Ｆターム(参考） 3D046 BB28 BB29 HH36 3J101 AA02 AA43 AA54 AA62 FA23 GA03 Continuation of front page    F term (reference) 3D046 BB28 BB29 HH36                 3J101 AA02 AA43 AA54 AA62 FA23                       GA03

Claims (1)

【特許請求の範囲】 【請求項１】 外周面に懸架装置に取り付ける為の第一
のフランジを、内周面に外輪軌道を、それぞれ有し、使
用時にも回転しない外輪と、外周面の外端寄り部分に車
輪を支持する為の第二のフランジを、同じく中間部に上
記外輪軌道と対向する内輪軌道を、それぞれ有し、中心
孔に挿通された駆動軸により使用時に回転駆動される内
輪相当部材と、上記外輪軌道と内輪軌道との間に転動自
在に設けられた複数個の転動体と、上記内輪相当部材の
内端部外周面で上記内輪軌道から外れた部分に、この内
輪相当部材と同心に支持された、被検出部の円周方向に
関する特性を交互に且つ等間隔に変化させたエンコーダ
と、上記外輪の内端部でこのエンコーダに対向する部分
に固定されたセンサホルダと、このセンサホルダに支持
されて、このエンコーダの被検出部にその検出部を対向
させた回転速度センサとを備えた回転速度検出装置付転
がり軸受ユニットに於いて、上記内輪相当部材の内端面
に、上記センサホルダの一部又はこのセンサホルダに支
持された別の部材の一部を、全周に亙って近接対向若し
くは摺接させた事を特徴とする回転速度検出装置付転が
り軸受ユニット。Claims: 1. An outer ring which has a first flange for attaching to a suspension device on an outer peripheral surface, and an outer ring raceway on an inner peripheral surface, and which does not rotate during use, and an outer peripheral surface of the outer peripheral surface. An inner ring which has a second flange for supporting the wheel at the end portion, and an inner ring track which is also opposed to the outer ring track at the middle portion, and which is rotated during use by a drive shaft inserted through the center hole. A corresponding member, a plurality of rolling elements rotatably provided between the outer raceway and the inner raceway, and a portion of the inner race corresponding member which is outside the inner raceway on the outer peripheral surface at the inner end. An encoder supported concentrically with the corresponding member and having alternately and equally spaced circumferential characteristics of a detected portion, and a sensor holder fixed to a portion facing the encoder at the inner end of the outer ring. And this sensor holder Then, in a rolling bearing unit with a rotation speed detecting device provided with a rotation speed sensor having a detection portion opposed to a detection portion of the encoder, an inner end surface of the member corresponding to the inner ring is provided with one of the sensor holders. A rolling bearing unit with a rotation speed detecting device, wherein a part or a part of another member supported by the sensor holder is brought into close proximity or sliding contact over the entire circumference.
JP2002057680A 2002-03-04 2002-03-04 Rolling bearing unit having rotating speed detecting device Pending JP2003254985A (en)

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Application Number Priority Date Filing Date Title
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JP2003254985A5 JP2003254985A5 (en) 2005-07-28

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ID=28667886

Family Applications (1)

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