JP3580002B2 - Rolling bearing unit with rotation speed detector - Google Patents

Rolling bearing unit with rotation speed detector Download PDF

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Publication number
JP3580002B2
JP3580002B2 JP00516396A JP516396A JP3580002B2 JP 3580002 B2 JP3580002 B2 JP 3580002B2 JP 00516396 A JP00516396 A JP 00516396A JP 516396 A JP516396 A JP 516396A JP 3580002 B2 JP3580002 B2 JP 3580002B2
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Japan
Prior art keywords
peripheral surface
rotating
fixed
seal ring
ring
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JPH09196946A (en
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英男 大内
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NSK Ltd
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NSK Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/007—Encoders, e.g. parts with a plurality of alternating magnetic poles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • 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

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

Description

【０００１】
【産業上の利用分野】
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】
アンチロックブレーキ装置（ＡＢＳ）やトラクションコントロール装置（ＴＣＳ）を制御する為には、懸架装置に回転自在に支持した車輪の回転速度を検出する必要がある。この為に使用する回転速度検出装置付転がり軸受ユニットは、従来から各種構造のものが知られているが、回転速度検出装置をコンパクトに構成して、全体を小型にした構造としては、例えばフランス特許公報 ＦＲ ２ ５７４ ５０１−Ａ１に記載されたものが知られている。図４は、この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を示している。
【０００３】
固定輪であって使用時に回転しない内輪１は、固定側周面である外周面に、固定側軌道面である内輪軌道２を有する。又、回転輪であって使用時に回転する外輪３は、回転側周面である内周面に、回転側軌道面である外輪軌道４（本発明の実施の形態を示す図１参照。但し、図１の場合、この外輪軌道４は固定側軌道面である。）を有する。そして、上記内輪軌道２と外輪軌道４との間に複数の転動体５を設けて、上記内輪１の周囲に外輪３を回転自在に支持している。又、上記外輪３の端部内周面には、断面Ｌ字形で全体を円環状に形成されたトーンホイール６を内嵌固定している。このトーンホイール６は、永久磁石７を備え、この永久磁石７の側面にＳ極とＮ極とを、交互に、且つ等間隔で配置している。一方、上記内輪１の端部外周面にはシールリング８を外嵌固定し、このシールリング８に保持したセンサ９を、上記トーンホイール６の側面に対向させている。上記シールリング８は、上記内輪１の端部外周面に外嵌固定される嵌合筒１０と弾性材１１とを備える。上記センサ９は、これら嵌合筒１０と弾性材１１とにより内外両周縁を支持された基板１２の側面に支持されている。この様に構成される回転速度検出装置付転がり軸受ユニットの場合、上記外輪３と共にトーンホイール６が回転すると上記センサ９の出力が、このトーンホイール６の回転速度に比例した周波数で変化する。そこで、このセンサ９の出力信号を図示しない制御器に入力すれば、ＡＢＳやＴＣＳを制御できる。
【０００４】
【発明が解決しようとする課題】
図４に示した従来構造の場合、センサ９を支持する為の基板１２と内輪１の外周面にシールリング８を固定する為の嵌合筒１０とを独立して設けている為、構成部品が多く、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て、部品点数を減少してコストを低減すべく発明したものである。
【０００５】
【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は、前述した従来の回転速度検出装置付転がり軸受ユニットと同様に、固定側周面に固定側軌道面を有し使用時に回転しない固定輪と、回転側周面に回転側軌道面を有し使用時に回転する回転輪と、上記固定側軌道面と回転側軌道面との間に設けられた複数の転動体と、全体を円環状に形成されて側面の磁気特性等の特性を円周方向に亙って交互に且つ等間隔に変化させ、上記回転側周面に支持されたトーンホイールと、上記固定側周面に支持されてこの固定側周面と上記回転側周面との間を塞ぐシールリングと、このシールリングに支持されて上記トーンホイールの側面と対向して、上記特性の変化に応じて出力を変化させるセンサとを備える。
特に、本発明の回転速度検出装置付転がり軸受ユニットに於いては、上記シールリングは弾性材中に円輪状の取付基板を包埋したものである。又、このシールリングを構成する弾性材の周縁部は、この取付基板の剛性に基づいて上記固定側周面に係止されている。そして、上記センサは上記取付基板の側面に支持されている。
【０００６】
【作用】
上述の様に構成され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、シールリングを構成する弾性材の周縁部を取付基板の剛性に基づいて固定側周面に係止しているので、少ない部品点数で必要な性能を得られる。
【０００７】
【発明の実施の形態】
図１〜３は本発明の実施の形態の１例を示している。回転輪であるハブ１３の外端部（外とは、自動車に装着した場合に幅方向外側になる部分を言い、図１、３の左側。）には車輪固定用のフランジ１４を設け、回転側周面である外周面の中間部には、回転側軌道面である内輪軌道２ａを形成している。又、上記ハブ１３の外周面の内端部（内とは、自動車に装着した場合に幅方向内側になる部分を言い、図１、３の右側。）には、やはり回転側周面である外周面に、やはり回転側軌道面である内輪軌道２ｂを有する内輪１ａを外嵌固定している。尚、図示の例では、駆動輪（ＦＲ車の後輪、ＦＦ車の前輪、４ＷＤ車の全輪）用の転がり軸受ユニットを示している。この為、上記ハブ１３を円筒状に形成し、その内周面に図示しない駆動軸の外周面に形成した雄スプライン溝と係合させる為の雌スプライン溝部１５を形成している。又、上記内輪１ａの内端面は上記ハブ１３の内端面よりも内方に突出させている。車両への組み付け状態では、上記内輪１ａの内端面と図示しない等速ジョイントの外端面とが当接する。
【０００８】
又、固定輪である外輪３ａは、図示しない懸架装置のナックルに支持する為の取付部１６を外周面に、固定側軌道面である複列の外輪軌道４、４を固定側周面である内周面に、それぞれ形成している。この外輪軌道４、４と上記内輪軌道２ａ、２ｂとの間には、それぞれ複数個ずつの転動体５、５を設けて、上記取付部１６により懸架装置に支持された外輪３ａの内側に、上記ハブ１３を回転自在に支持している。尚、図示の例では転動体５、５として玉を示しているが、重量の嵩む自動車用の転がり軸受ユニットの場合には転動体としてテーパころを使用する場合もある。
【０００９】
更に、上記外輪３ａの外端部内周面と上記ハブ１３の中間部内周面との間には１個のシールリング１７を、この外輪３ａの内端部内周面と、上記内輪１ａの内端部外周面との間には１対のシールリング１８ａ、１８ｂを、それぞれ設けている。上記１対のシールリング１８ａ、１８ｂのうち、転動体５、５側に設けたシールリング１８ａは、芯金１９と弾性材２０とにより構成されている。このうちの芯金１９は、軟鋼板等の金属板を断面Ｌ字形で全体を円環状に形成している。又、この芯金１９の内径は上記内輪１ａの内端部の外径よりも少しだけ大きく、芯金１９の外径は上記外輪３ａの内端部の内径よりも十分に小さい。
【００１０】
又、上記弾性材２０は、フェライトの粉末を混入したゴム磁石であり、上記芯金１９はこの弾性材２０中に包埋されている。又、この弾性材２０は、軸方向（図１、３の左右方向）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。従ってこの弾性材２０の内側面には、Ｓ極とＮ極とが、交互に、且つ等間隔で配置されていて、上記シールリング１８ａがトーンホイールとして機能する。この様なシールリング１８ａは、上記弾性材２０の内周縁を上記内輪１ａの内端部外周面に形成した係合溝２１に弾性係合させる事により、この内輪１ａの内端部外周面に係止している。そして、この状態で上記弾性材２０の外周縁を、上記外輪３ａの内端部内周面に、全周に亙って摺接させている。
【００１１】
一方、開口端側に設けたシールリング１８ｂは、取付基板２２と弾性材２３とから構成されている。このうちの取付基板２２は、フェノール樹脂等の合成樹脂、或は金属板等の板材により、全体を円輪状に形成している。この取付基板２２の外径は上記外輪３ａの内端部の内径よりも少しだけ小さく、取付基板２２の内径は上記内輪１ａの内端部の外径よりも十分に大きい。この様な取付基板２２の外側面にはセンサ９ａを支持固定し、このセンサ９ａを、上記転動体５、５側に設けたシールリング１８ａの弾性材２０の内側面に対向させている。このセンサ９ａには、ホール素子、或はＭＲ素子等、磁束の方向、或は密度の変化に応じて出力を変化させる素子を組み込み、更にスペースが許せば必要に応じて、電源安定化回路、波形整形回路等の電気回路部品も組み込む。この場合、センサ本体と電気回路部品とを１個のＩＣ中に組み込めば、全体を極く小型に構成して、限られた設置スペースへの組み込みが可能になる。但し、上記電気回路は必ずしもセンサ本体と同じ部分に設ける必要はなく、任意の空きスペースに設置すれば良い。何れにしても、上記センサ９ａの出力信号は、上記シールリング１８ｂの内側面から導出されたハーネス２５により取り出して、図示しない制御器に送る。
【００１２】
又、上記弾性材２３は、ゴム、エラストマー等により構成されている。そして上記取付基板２２及びセンサ９ａは、この弾性材２３中に包埋されている。この様なシールリング１８ｂは、上記弾性材２３の外周縁を上記外輪３ａの内端部内周面に形成した係合溝２４に弾性係合させる事により、この外輪３ａの内端部内周面に係止している。そして、この状態で上記弾性材２３の内周縁を、上記内輪１ａの内端部外周面に、全周に亙って摺接させている。
【００１３】
上述した様な回転速度検出装置付転がり軸受ユニットの場合、ハブ１３の外端部に設けられたフランジ１４に固定された車輪を、外輪３ａを支持した懸架装置に対し、回転自在に支持できる。又、車輪の回転に伴なってハブ１３の内端部に外嵌固定した内輪１ａと共にシールリング１８ａが回転すると、このシールリング１８ａと対向したセンサ９ａの出力が変化する。このセンサ９ａの出力が変化する周波数は、車輪の回転速度に比例する為、センサ９ａの出力信号をハーネス２５を介して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。
【００１４】
上述の様な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、車輪を回転自在に支持する作用、並びに車輪の回転速度を検出する作用は、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、センサ９ａを包埋したシールリング１８ｂを構成する弾性材２３の周縁部を、このセンサ９ａを取り付ける為の取付基板２２の剛性に基づいて外輪３ａの内端部内周面に係止しているので、少ない部品点数で必要な性能を得られる。より具体的には、前記図４に示した従来構造に設けていた嵌合筒１０が不要となるので、その分、部品点数の削減によるコスト低減が可能になる。
【００１５】
【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、小型且つ安価な回転速度検出装置付転がり軸受ユニットを得られる。
【図面の簡単な説明】
【図１】本発明の実施の形態の１例を示す、図２のＡ−Ａ断面図。
【図２】図１の右方から見た図。
【図３】ハーネスを省略して示す、図１のＢ部拡大図。
【図４】従来構造の１例を示す部分断面図。
【符号の説明】
１、１ａ 内輪
２、２ａ、２ｂ 内輪軌道
３、３ａ 外輪
４ 外輪軌道
５ 転動体
６ トーンホイール
７ 永久磁石
８ シールリング
９、９ａ センサ
１０ 嵌合筒
１１ 弾性材
１２ 基板
１３ ハブ
１４ フランジ
１５ 雌スプライン溝部
１６ 取付部
１７、１８ａ、１８ｂ シールリング
１９ 芯金
２０ 弾性材
２１ 係合溝
２２ 取付基板
２３ 弾性材
２４ 係合溝
２５ ハーネス[0001]
[Industrial applications]
A rolling bearing unit with a rotation speed detecting device according to the present invention rotatably supports a wheel of an automobile with respect to a suspension device and is used for detecting a rotation speed of the wheel.
[0002]
[Prior art]
In order to control an anti-lock brake device (ABS) or a traction control device (TCS), it is necessary to detect a rotation speed of a wheel rotatably supported by a suspension device. Rolling bearing units with a rotational speed detecting device used for this purpose have conventionally been known to have various structures. However, as a structure in which the rotational speed detecting device is made compact and the whole is made compact, for example, French The thing described in patent publication FR2574501-A1 is known. FIG. 4 shows a rolling bearing unit with a rotation speed detecting device described in this publication.
[0003]
The inner ring 1 which is a fixed ring and does not rotate during use has an inner ring raceway 2 which is a fixed side raceway surface on an outer peripheral surface which is a fixed side peripheral surface. An outer ring 3 which is a rotating wheel and rotates during use has an outer ring raceway 4 which is a rotating raceway surface on an inner circumferential surface which is a rotating side circumferential surface (see FIG. 1 showing an embodiment of the present invention. In the case of FIG. 1, the outer raceway 4 is a fixed-side raceway surface.) A plurality of rolling elements 5 are provided between the inner raceway 2 and the outer raceway 4 to rotatably support the outer race 3 around the inner race 1. Further, a tone wheel 6 having an L-shaped cross section and formed entirely in an annular shape is internally fixed to the inner peripheral surface of the end of the outer ring 3. The tone wheel 6 includes a permanent magnet 7, and S poles and N poles are alternately arranged on the side surface of the permanent magnet 7 at equal intervals. On the other hand, a seal ring 8 is externally fitted and fixed to the outer peripheral surface of the end of the inner ring 1, and the sensor 9 held by the seal ring 8 is opposed to the side surface of the tone wheel 6. The seal ring 8 includes a fitting cylinder 10 and an elastic member 11 which are fitted and fixed to the outer peripheral surface of the end of the inner ring 1. The sensor 9 is supported on a side surface of a substrate 12 whose inner and outer peripheral edges are supported by the fitting tube 10 and the elastic member 11. In the case of the rolling bearing unit with the rotation speed detecting device configured as described above, when the tone wheel 6 rotates together with the outer ring 3, the output of the sensor 9 changes at a frequency proportional to the rotation speed of the tone wheel 6. Therefore, ABS and TCS can be controlled by inputting the output signal of the sensor 9 to a controller (not shown).
[0004]
[Problems to be solved by the invention]
In the case of the conventional structure shown in FIG. 4, since the substrate 12 for supporting the sensor 9 and the fitting tube 10 for fixing the seal ring 8 on the outer peripheral surface of the inner ring 1 are provided independently, Inevitably increases the cost. In view of such circumstances, the rolling bearing unit with a rotation speed detecting device of the present invention has been invented to reduce the number of parts and cost.
[0005]
[Means for Solving the Problems]
The rolling bearing unit with the rotation speed detecting device of the present invention comprises, similarly to the above-described conventional rolling bearing unit with the rotation speed detecting device, a fixed wheel that has a fixed side raceway surface on a fixed side peripheral surface and does not rotate during use, and A rotating wheel having a rotating raceway surface on a side peripheral surface and rotating during use, a plurality of rolling elements provided between the fixed raceway surface and the rotating raceway surface, and the whole is formed in an annular shape. The characteristics such as the magnetic properties of the side surfaces are alternately changed at equal intervals in the circumferential direction, and the tone wheel supported on the rotating peripheral surface and the fixed peripheral surface supported on the fixed peripheral surface. A seal ring that seals between the surface and the rotation-side peripheral surface; and a sensor that is supported by the seal ring, faces the side surface of the tone wheel, and changes output according to a change in the characteristic.
In particular, in the rolling bearing unit with a rotation speed detecting device of the present invention, the seal ring is formed by embedding a ring-shaped mounting substrate in an elastic material. The peripheral edge of the elastic material constituting the seal ring is locked to the fixed peripheral surface based on the rigidity of the mounting board. The sensor is supported on a side surface of the mounting board.
[0006]
[Action]
In the case of the rolling bearing unit with the rotation speed detecting device of the present invention configured as described above, the peripheral portion of the elastic material forming the seal ring is locked to the fixed side peripheral surface based on the rigidity of the mounting substrate. The required performance can be obtained with a small number of parts.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 3 show an example of an embodiment of the present invention. An outer end portion of the hub 13 which is a rotating wheel (the outer portion is a portion which becomes outward in the width direction when mounted on an automobile, and a left side in FIGS. 1 and 3) is provided with a flange 14 for fixing the wheel. An inner raceway 2a, which is a rotating raceway surface, is formed at an intermediate portion of the outer circumferential surface, which is a side circumferential surface. Also, the inner end portion of the outer peripheral surface of the hub 13 (the inner portion is a portion which becomes inward in the width direction when mounted on an automobile, and the right side in FIGS. 1 and 3) is also a rotating side peripheral surface. An inner ring 1a having an inner ring raceway 2b, which is also a rotation side raceway surface, is externally fitted and fixed to the outer peripheral surface. In the illustrated example, rolling bearing units for drive wheels (rear wheels of FR vehicles, front wheels of FF vehicles, and all wheels of 4WD vehicles) are shown. For this reason, the hub 13 is formed in a cylindrical shape, and a female spline groove 15 for engaging with a male spline groove formed on an outer peripheral surface of a drive shaft (not shown) is formed on an inner peripheral surface thereof. The inner end surface of the inner ring 1a is projected more inward than the inner end surface of the hub 13. In a state of being assembled to the vehicle, the inner end surface of the inner ring 1a and the outer end surface of a not-shown constant velocity joint abut.
[0008]
The outer ring 3a, which is a fixed ring, has a mounting portion 16 for supporting a knuckle of a suspension device (not shown) on the outer peripheral surface, and the double-row outer ring raceways 4, 4 which are fixed-side race surfaces are fixed-side peripheral surfaces. Each is formed on the inner peripheral surface. A plurality of rolling elements 5, 5 are provided between the outer raceways 4, 4 and the inner raceways 2a, 2b, respectively, and inside the outer race 3a supported by the suspension device by the mounting portion 16, The hub 13 is rotatably supported. Although balls are shown as the rolling elements 5 and 5 in the illustrated example, tapered rollers may be used as rolling elements in the case of a heavy-duty rolling bearing unit for an automobile.
[0009]
Further, one seal ring 17 is provided between the inner peripheral surface of the outer end of the outer ring 3a and the inner peripheral surface of the intermediate portion of the hub 13, and the inner peripheral surface of the inner end of the outer race 3a and the inner end of the inner race 1a. A pair of seal rings 18a and 18b are provided between the outer peripheral surface and the outer peripheral surface. Of the pair of seal rings 18a and 18b, the seal ring 18a provided on the rolling elements 5 and 5 includes a core metal 19 and an elastic material 20. The core 19 is formed by forming a metal plate such as a mild steel plate into an annular shape with an L-shaped cross section. The inner diameter of the core 19 is slightly larger than the outer diameter of the inner end of the inner ring 1a, and the outer diameter of the core 19 is sufficiently smaller than the inner diameter of the inner end of the outer ring 3a.
[0010]
The elastic material 20 is a rubber magnet mixed with ferrite powder, and the core metal 19 is embedded in the elastic material 20. The elastic member 20 is magnetized in the axial direction (the left-right direction in FIGS. 1 and 3). The magnetization directions are changed alternately at regular intervals in the circumferential direction. Therefore, S poles and N poles are alternately arranged at equal intervals on the inner surface of the elastic member 20, and the seal ring 18a functions as a tone wheel. Such a seal ring 18a is formed on the outer peripheral surface of the inner end 1a by elastically engaging the inner peripheral edge of the elastic member 20 with the engaging groove 21 formed on the outer peripheral surface of the inner end of the inner race 1a. It is locked. In this state, the outer peripheral edge of the elastic member 20 is brought into sliding contact with the inner peripheral surface of the inner end of the outer ring 3a over the entire circumference.
[0011]
On the other hand, the seal ring 18 b provided on the opening end side is composed of a mounting substrate 22 and an elastic material 23. The mounting substrate 22 is formed in a ring shape entirely from a synthetic resin such as a phenol resin or a plate material such as a metal plate. The outer diameter of the mounting board 22 is slightly smaller than the inner diameter of the inner end of the outer ring 3a, and the inner diameter of the mounting board 22 is sufficiently larger than the outer diameter of the inner end of the inner ring 1a. The sensor 9a is supported and fixed on the outer surface of such a mounting board 22, and the sensor 9a faces the inner surface of the elastic member 20 of the seal ring 18a provided on the rolling elements 5, 5 side. The sensor 9a incorporates an element such as a Hall element or an MR element that changes the output in accordance with the direction of the magnetic flux or the change in the density. Further, if space permits, a power stabilizing circuit, Electric circuit components such as a waveform shaping circuit are also incorporated. In this case, if the sensor main body and the electric circuit component are incorporated in one IC, the whole can be configured to be extremely small and can be incorporated in a limited installation space. However, the electric circuit does not necessarily need to be provided in the same portion as the sensor main body, and may be provided in any empty space. In any case, the output signal of the sensor 9a is taken out by the harness 25 led out from the inner surface of the seal ring 18b and sent to a controller (not shown).
[0012]
The elastic member 23 is made of rubber, elastomer, or the like. The mounting board 22 and the sensor 9a are embedded in the elastic member 23. Such a seal ring 18b is provided on the inner peripheral surface of the inner ring of the outer ring 3a by elastically engaging the outer peripheral edge of the elastic member 23 with the engaging groove 24 formed on the inner peripheral surface of the inner end of the outer ring 3a. It is locked. In this state, the inner peripheral edge of the elastic member 23 is brought into sliding contact with the outer peripheral surface of the inner end portion of the inner ring 1a over the entire circumference.
[0013]
In the case of the rolling bearing unit with the rotation speed detecting device as described above, the wheel fixed to the flange 14 provided at the outer end of the hub 13 can be rotatably supported by the suspension device supporting the outer ring 3a. Also, when the seal ring 18a rotates together with the inner ring 1a externally fitted and fixed to the inner end of the hub 13 with the rotation of the wheel, the output of the sensor 9a facing the seal ring 18a changes. Since the frequency at which the output of the sensor 9a changes is proportional to the rotation speed of the wheel, if the output signal of the sensor 9a is input to a controller (not shown) via the harness 25, the rotation speed of the wheel is obtained, and ABS and TCS can be controlled appropriately.
[0014]
In the case of the above-described rolling bearing unit with a rotation speed detecting device of the present invention, the operation of rotatably supporting the wheel and the operation of detecting the rotation speed of the wheel are performed by a conventionally known rolling device with a rotation speed detecting device. Same as the bearing unit. In particular, in the case of the rolling bearing unit with the rotation speed detecting device of the present invention, the peripheral portion of the elastic member 23 constituting the seal ring 18b in which the sensor 9a is embedded is rigidly attached to the mounting board 22 for mounting the sensor 9a. Therefore, the required performance can be obtained with a small number of parts because the outer ring 3a is locked to the inner peripheral surface of the inner end portion of the outer ring 3a. More specifically, since the fitting tube 10 provided in the conventional structure shown in FIG. 4 is not required, the cost can be reduced by reducing the number of parts.
[0015]
【The invention's effect】
Since the rolling bearing unit with the rotation speed detecting device of the present invention is configured and operates as described above, a small and inexpensive rolling bearing unit with the rotation speed detecting device can be obtained.
[Brief description of the drawings]
FIG. 1 is a sectional view taken along the line AA of FIG. 2, showing one example of an embodiment of the present invention.
FIG. 2 is a view seen from the right side of FIG. 1;
FIG. 3 is an enlarged view of a portion B in FIG. 1 with a harness omitted;
FIG. 4 is a partial cross-sectional view showing one example of a conventional structure.
[Explanation of symbols]
1, 1a Inner ring 2, 2a, 2b Inner ring raceway 3, 3a Outer race 4 Outer raceway 5 Rolling element 6 Tone wheel 7 Permanent magnet 8 Seal ring 9, 9a Sensor 10 Fitting cylinder 11 Elastic material 12 Substrate 13 Hub 14 Flange 15 Female spline Groove part 16 Mounting part 17, 18a, 18b Seal ring 19 Core metal 20 Elastic material 21 Engagement groove 22 Mounting substrate 23 Elastic material 24 Engagement groove 25 Harness

Claims (1)

固定側周面に固定側軌道面を有し使用時に回転しない固定輪と、回転側周面に回転側軌道面を有し使用時に回転する回転輪と、上記固定側軌道面と回転側軌道面との間に設けられた複数の転動体と、全体を円環状に形成されて側面の特性を円周方向に亙って交互に且つ等間隔に変化させ、上記回転側周面に支持されたトーンホイールと、上記固定側周面に支持されてこの固定側周面と上記回転側周面との間を塞ぐシールリングと、このシールリングに支持されて上記トーンホイールの側面と対向する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、上記シールリングは弾性材中に円輪状の取付基板を包埋したものであり、このシールリングを構成する弾性材の周縁部は、この取付基板の剛性に基づいて上記固定側周面に係止されており、上記センサは上記取付基板の側面に支持されている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。A fixed wheel having a fixed raceway surface on the fixed peripheral surface and not rotating when used; a rotating wheel having a rotating raceway surface on the rotating peripheral surface and rotating during use; the fixed raceway surface and the rotating raceway surface And a plurality of rolling elements provided therebetween, and the whole is formed in an annular shape, and the characteristics of the side face are alternately changed at equal intervals in the circumferential direction, and are supported on the rotating side peripheral surface. A tone wheel, a seal ring supported on the fixed side peripheral surface and closing the gap between the fixed side peripheral surface and the rotating side peripheral surface, and a sensor supported by the seal ring and facing a side surface of the tone wheel. In a rolling bearing unit with a rotation speed detecting device provided with a seal ring, the seal ring is formed by embedding a ring-shaped mounting substrate in an elastic material, and the peripheral portion of the elastic material forming the seal ring is It engaged with the stationary side peripheral surface on the basis of the rigidity of the mounting substrate Are, the sensor is rolling bearing unit, characterized in that is supported on the side surface of the mounting substrate.
JP00516396A 1996-01-16 1996-01-16 Rolling bearing unit with rotation speed detector Expired - Fee Related JP3580002B2 (en)

Priority Applications (1)

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Applications Claiming Priority (1)

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JP00516396A JP3580002B2 (en) 1996-01-16 1996-01-16 Rolling bearing unit with rotation speed detector

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JP3580002B2 true JP3580002B2 (en) 2004-10-20

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IT1309554B1 (en) * 1999-03-04 2002-01-23 Skf Ind Spa BEARING GROUP FOR A RAILWAY AXLE.
DE10335048B4 (en) * 2003-07-31 2010-08-19 Carl Freudenberg Kg Pulse generator to detect the speed of shafts or hubs
DE10335049B4 (en) * 2003-07-31 2010-08-19 Carl Freudenberg Kg Pulse generator to detect the speed of shafts or hubs
JP4480385B2 (en) * 2003-11-25 2010-06-16 Ｎｔｎ株式会社 Bearing with IC tag and its seal
US7534045B2 (en) 2003-11-25 2009-05-19 Ntn Corporation Bearing with IC tag and seal for the same
ITTO20040331A1 (en) * 2004-05-19 2004-08-19 Skf Ab SEALING DEVICE WITH CONICAL WHEEL
JP2006153112A (en) * 2004-11-29 2006-06-15 Jtekt Corp Bearing device for wheel
JP4835045B2 (en) * 2005-06-16 2011-12-14 日本精工株式会社 Rolling bearing unit for wheel support
JP4829824B2 (en) * 2007-03-22 2011-12-07 Ｎｔｎ株式会社 Rolling bearing with rotation sensor
JP2008241557A (en) * 2007-03-28 2008-10-09 Ntn Corp Rotation detecting sensor
EP2136212A4 (en) * 2007-03-28 2012-07-25 Ntn Toyo Bearing Co Ltd Rotation sensor
JP4851381B2 (en) * 2007-03-30 2012-01-11 Ｎｔｎ株式会社 Rolling bearing with rotation sensor
JP5063209B2 (en) 2007-06-20 2012-10-31 Ｎｔｎ株式会社 Rotation detection sensor / fixing member mounting body
JP5063231B2 (en) * 2007-07-18 2012-10-31 Ｎｔｎ株式会社 Rotation detection sensor / fixing member mounting body
WO2009011121A1 (en) * 2007-07-18 2009-01-22 Ntn Corporation Rotation detection sensor
JP2012007706A (en) * 2010-06-28 2012-01-12 Nsk Ltd Rolling bearing with sensor
JP5817105B2 (en) * 2010-11-26 2015-11-18 日本精工株式会社 Rolling bearings with sensors, automobiles, railway vehicles, steelmaking facilities and machine tools
JP2017062014A (en) * 2015-09-25 2017-03-30 Ntn株式会社 Bearing device for wheel

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