JP5103704B2 - Pulsaring and rotation detector - Google Patents

Pulsaring and rotation detector Download PDF

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Publication number
JP5103704B2
JP5103704B2 JP2001276196A JP2001276196A JP5103704B2 JP 5103704 B2 JP5103704 B2 JP 5103704B2 JP 2001276196 A JP2001276196 A JP 2001276196A JP 2001276196 A JP2001276196 A JP 2001276196A JP 5103704 B2 JP5103704 B2 JP 5103704B2
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magnetic
pulsar ring
magnetic sensor
ring
friction coefficient
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JP2003083765A (en
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稔博 羽方
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JTEKT Corp
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JTEKT Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/007—Encoders, e.g. parts with a plurality of alternating magnetic poles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7886—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted outside the gap between the inner and outer races, e.g. sealing rings mounted to an end face or outer surface of a race
    • 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
    • F16C19/185—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 two raceways provided integrally on a part other than a race ring, e.g. a shaft or housing
    • 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)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、パルサリングおよびこれを用いた回転検出装置に関する。
【０００２】
【従来の技術】
自動車のアンチロックブレーキシステムにおいては、車輪の軸受装置に、回転検出装置としてパルサリングと磁気センサとを備えたものがある。この回転検出装置の場合、通常、回転を検出される回転側にパルサリングが、回転を検出する固定側に磁気センサが取り付けられる。パルサリングと磁気センサは、軸方向あるいは径方向で対向配置されている。
【０００３】
このような回転検出装置におけるパルサリングの被検知面には、周方向交互にＳ極とＮ極とが着磁されて構成され、その回転に伴ない、磁気センサに対してその回転速度に対応して交互に異なる極性の磁力を発生する。そして、磁気センサは、その発生磁力に基づいて回転側における回転状態を検知できるようになっている。
【０００４】
【発明が解決しようとする課題】
上記従来のパルサリングは被検知面が外部に露呈しているので、その外表面に鉄粉等の磁性異物が付着することがある。特に、上記従来のパルサリングは、被検知面が着磁ゴム材であるため、磁性異物が付着するととれにくく、この磁性異物の付着量が多くなると、磁力が低下し、磁気センサによる検出精度が低下する傾向となる。
【０００５】
したがって、本発明は、パルサリングの被検知面に鉄粉等の磁性異物を付着しにくくし、磁気センサと共に回転検出装置として使用された場合、その回転検出精度を向上することを解決すべき課題とする。
【０００６】
【課題を解決するための手段】
本発明のパルサリングは、磁気センサと対となって回転検出装置を構成するパルサリングであって、周方向交互に異なる磁極が設けられかつ円周所定位置に前記磁気センサが対向される被検知面を有し、この被検知面の外表面に、非磁性材が付着され、前記非磁性材の表面の摩擦係数が、前記被検知面の表面の摩擦係数よりも小に設定されるとともに、前記非磁性材の厚さが、前記パルサリングの磁力を弱くするとともに、前記磁気センサの検知精度に影響を与えないように設定されていることを特徴とする。
【０００７】
この非磁性材は、膜状であっても板状であってもよい。
【０００８】
本発明のパルサリングによれば、被検知面の外表面に、非磁性材が付着されているので、非磁性材の厚み分だけ磁性異物を吸着する磁力は弱くなる。そのため、磁性異物が付着しにくくなる。仮に磁性異物が付着しても、その吸着力は弱くなっているので、回転体の遠心力を受けることで磁性異物はパルサリングから剥れやすくなる。
【０００９】
本発明の場合、前記磁極が、磁性粉を分散混入したゴム材を磁化することにより得られるものであっても、回転体の遠心力を受けることで磁性異物はパルサリングから容易に剥されやすくなる。
【００１０】
本発明の場合、前記非磁性材の表面の摩擦係数が、前記被検知面の表面の摩擦係数よりも小に設定されているので、磁性異物が付着する表面は滑りやすくなる。その上、非磁性材の厚み分だけ磁力による吸着力は弱くなっているので、さらに磁性異物は付着しにくくなる。仮に磁性異物が付着しても磁性異物はより一層剥れやすくなる。
【００１１】
【発明の実施の形態】
本発明の詳細を図面に示す実施形態に基づいて説明する。本発明の軸受装置は、車軸用軸受装置(ハブユニット)に適用して説明されるが、本発明は、車軸用軸受装置に限定されるものではなく他の軸受装置にも適用される。
【００１２】
図１ないし図４は、本実施の形態に係り、図１は、ハブユニットの縦断面図、図２は、図１の要部の拡大断面図、図３は、図１の要部の分解斜視図、図４は、図１の要部の作用説明に供する図である。
【００１３】
図１において、１はハブユニット、２は車軸、３は車軸ケースである。図１で示されるハブユニット１の左側は、車両アウター側となり、右側は、車両インナー側となる。
【００１４】
ハブユニット１は、ハブホイール４と、転がり軸受５とを備えている。
【００１５】
ハブホイール４は、不図示の車輪が取り付けられる径方向外向きのフランジ４１と、中空の軸部４２とを備えている。
【００１６】
ハブホイール４の軸部４２の外周面には転がり軸受５が外嵌装着されている。
【００１７】
転がり軸受５は、複列外向きアンギュラ玉軸受からなり、ハブホイール４の軸部４２の小径外周面に圧入外嵌される一方内輪５１と、二列の軌道溝を有する単一の外輪５２と、二列で配設される複数の玉５３と、二つの冠形保持器５４、５４とを備える。ハブホイール４の軸部４２の大径外周面は、転がり軸受５の他方内輪に用いられる。
【００１８】
転がり軸受５の外輪５２の外周には、径方向外向きのフランジ５５が設けられている。転がり軸受５は、このフランジ５５を介して車軸ケース３に固定される。
【００１９】
また、図１において、６は、環状のパルサリング支持体、７は環状の磁気センサ支持体、８は回転検出装置である。
【００２０】
パルサリング支持体６は、転がり軸受５の内輪５１の軸端外周面に圧入外嵌される円筒部６１と、この円筒部６１の軸端から径方向に沿って外方に延びる環状部６２とを備える。
【００２１】
磁気センサ支持体７は、転がり軸受５の外輪５２の軸端外周部に対して圧入外嵌されている車両アウター側に延びる円筒部７１と、内・外輪５１、５２間の環状空間を閉塞する環状部７２と、車両インナー側に伸びる円筒部７３とを備える。この円筒部７３の内周面に車軸２の外周面に接触される弾性リップ７４が接着される。円筒部７１の円周１箇所に径方向内外に貫通する磁気センサ取付用開口部７５が設けられる。
【００２２】
回転検出装置８は、アクティブタイプであって、パルサリング１０と、磁気センサ２０とを備える。
【００２３】
パルサリング１０は、磁性材を用いて環状に形成され、磁気センサ２０と対向する被検知面に周方向交互に互いに異なる磁極であるＳ極とＮ極が着磁されている。また、パルサリング１０は、磁性粉を分散混入したゴム材を磁化することで得られるものである。
【００２４】
磁気センサ２０は、周知のホールＩＣとされる。このホールＩＣは、詳細に図示していないが、ＩＣチップを合成樹脂からなる保護カバーでモールドされて構成されている。磁気センサ２０の外形は、直方体形状とされており、その上端からコード端２１が引き出されている。
【００２５】
磁気センサ２０の軸方向における車両アウター側に面した側面は、検知面とされ、また、磁気センサ２０の上端面は、軸方向に張り出した環状張出片２２が形成されている。
【００２６】
パルサリング１０は、パルサリング支持体６の環状部６２に貼着され、また、磁気センサ２０は、その検知面がパルサリング１０と軸方向で対向するよう、磁気センサ支持体７の開口部７５を挿通されて転がり軸受５の外輪５２の軸端に取り付けられる。
【００２７】
以上の構成において、パルサリング１０の被検知面と、磁気センサ２０の検知面は、互いに軸方向で対向する。
【００２８】
次に、本実施の形態の特徴について説明する。
【００２９】
本実施の形態では、パルサリング１０の被検知面に、非磁性材１１が付着されている。
【００３０】
最初に、非磁性材１１の厚さｔについて説明する。
【００３１】
非磁性材１１は、その厚さｔに対応してパルサリング１０が発生する磁力を弱めることで、その表面における磁性異物に対する磁力による吸着力を弱める作用をする。この場合、非磁性材１１を通過した後の磁力が小さすぎると、磁気センサ２０での検知精度が低下するおそれがある。そこで、非磁性材１１は、磁性異物の付着を防止できる一方で、磁気センサ２０に対してはその検知精度に影響を与えない所要の厚さｔに構成される。
【００３２】
次に、非磁性材１１の表面の摩擦係数μ2について説明する。
【００３３】
非磁性材１１の表面の摩擦係数μ2は、パルサリング１０の被検知面の摩擦係数μ1よりも小に設定される。
【００３４】
非磁性材１１の表面の摩擦係数μ2は、小さくなればなるほど非磁性材１１の表面は滑りやすくなり、磁性異物は、回転体の遠心力でパルサリングから剥れやすくなるので、非磁性材１１の表面の摩擦係数μ2は、小さくなればなるほどよい。
【００３５】
そこで、非磁性材１１の表面の摩擦係数μ2をパルサリング１０の被検知面の摩擦係数μ1より小に設定する方法としては、摩擦係数が小さい素材を非磁性材１１として用いる方法と、非磁性材１１の表面粗さ（例えばＪＩＳＢ０６０１の十点平均粗さ）Ｒｚを小さくする方法と、この２つの方法を合わせた方法との３通りの方法ある。
【００３６】
最後に、非磁性材１１と磁気センサ２０との軸方向の対向間隔Ａについて説明する。
【００３７】
従来(非磁性材１１がない場合)は、パルサリング１０の被検知面と磁気センサ２０との軸方向の対向間隔Ｂは、必要とされる磁気センサからの出力あるいはハブユニットの種類に従って定められる値であった。
【００３８】
非磁性材１１を設けた構成では、非磁性材１１と磁気センサ２０との軸方向の対向間隔Ａを、必要とされる磁気センサからの出力あるいはハブユニットの種類に従って定められる値としてもよいし、従来通り、パルサリング１０の被検知面と磁気センサ２０との軸方向の対向間隔Ｂを、必要とされる磁気センサからの出力あるいはハブユニットの種類に従って定められる値としてもよい。
【００３９】
図４を参照して、動作を説明する。
【００４０】
図４で示すように、パルサリング１０の非磁性材１１に磁性異物Ｓが付着するとき、この磁性異物Ｓは、非磁性材１１の厚さｔ分だけ、パルサリング１０の被検知面から離れることになる。
【００４１】
このとき、パルサリング１０の被検知面に、非磁性部材１１が無く直接、磁性異物Ｓが付着した場合に、パルサリング１０から磁性異物Ｓに加わる磁力をＦ1(直接磁力Ｆ1)とし、また、非磁性材１１を介して間接的にパルサリング１０から磁性異物Ｓに加わる磁力をＦ2(間接磁力Ｆ2)とする。当然、直接磁力Ｆ1＞間接磁力Ｆ2となる。
【００４２】
また、パルサリング１０の表面の摩擦係数をμ1、非磁性材１１の表面の摩擦係数をμ2とすると、μ1＞μ2の関係が成立するから、磁性異物Ｓは、パルサリング１０の表面よりも、非磁性材１１の表面の方が、滑りすい。
【００４３】
仮に磁性異物Ｓが付着しても、非磁性材１１を介して付着したときの摩擦力μ2Ｆ2は、直接付着したときの摩擦力μ1Ｆ1に比べて、当然、弱くなるので、磁性異物Ｓは、内輪５１の回転と伴なう遠心力Ｗを受けて、パルサリング１０の非磁性材１１の表面から容易に剥離する。
【００４４】
以上のことから、パルサリング１０に非磁性材１１を設けることで、磁性異物Ｓは、パルサリング１０の磁力により吸着されにくく、また、非磁性材１１の表面は滑りやすいので、結局、磁性異物Ｓは、遠心力Ｗを受けて、パルサリング１０の非磁性材１１表面から容易に剥離する。
【００４５】
磁性異物Ｓがパルサリング１０に付着しないことによりパルサリング１０の磁力低下を防止できる。
【００４６】
なお、本発明は上記実施形態のみに限定されるものではなく、種々な応用や変形が考えられる。
【００４７】
（１）上記実施形態では、パルサリング１０と磁気センサ２０とが軸方向で対向した例を挙げているが、例えば、図５の実施形態のように、径方向で対向させてもよい。パルサリング１０およびパルサリング支持体６が円筒形に形成され、パルサリング支持体６の外周面にパルサリング１０が貼着されるようにする。
【００４８】
パルサリング１０の被検知面に、非磁性材１１が設けられる。さらに、磁気センサ２０の検知面は、径方向下向きにパルサリング１０の被検知面に径方向で対向している。
【００４９】
（２）上記実施形態では、磁気センサ２０を磁気センサ支持体７に対して径方向から着脱するようにした例を挙げているが、図示しないが、軸方向から着脱させるようにしてよい。
【００５０】
（３）上記実施形態では、転がり軸受５の車両インナー側端部に回転検出装置８を設けた例を挙げているが、転がり軸受５の車両アウター側端部に回転検出装置８を設ける構成にしてもよい。
【００５１】
（４）上記実施形態では、転がり軸受５はハブホイール４の軸部４２の外周面を一方の内輪として利用した例を挙げているが、例えば、図６に示す実施形態のように、ハブホイール４と内輪５６とを別体とした２つの内輪５１、５６が並列に設けられたハブユニット１００を使用してもよい。
【００５２】
このようなハブユニット１００の転がり軸受５の車両アウター側端部に対して、本発明の係る回転検出装置８が取り付けられる。
【００５３】
磁気センサ２０は、転がり軸受５に取付穴を設けて取り付けられる。
【００５４】
パルサリング１０は、前記内輪５６の車両アウター側の外端部に断面Ｌ字状のパルサリング支持体６に取り付けられる。パルサリング支持体６の環状板部６２の車両アウト面に磁気センサ２０と対向するようにパルサリング１０が貼着される。このパルサリング１０の磁気センサ２０と対向する面に非磁性材からなる非磁性材１１が設けられる。
【００５５】
（５）上記実施形態の場合、パルサリング１０と磁気センサ２０において、パルサリング１０は、パルサリング支持体６を介して内輪５１に、また、磁気センサ２０は、磁気センサ支持体７を介して外輪５２に、それぞれ、固定されている。
【００５６】
パルサリング支持体６と内輪５１とを含めて軸体とし、磁気センサ支持体７と外輪５２とを含めて筒体とすることができる。そして、前記軸体は回転部材側となり、筒体は固定部材側となる。
【００５７】
この場合、パルサリング１０と磁気センサ２０は、相対回転する関係があればよいから、筒体と軸体のいずれか一方を固定部材側、他方を回転部材側とし、その固定部材側または回転部材側の一方にパルサリング１０を、他方に磁気センサ２０を設けてもよい。
【００５８】
（６）上記実施形態では、回転検出装置を、自動車の駆動車軸用のハブユニットに利用した例を挙げているが、図示しないが周知の従動車軸用のハブユニットにも利用することができる。その他、具体例は挙げないが、要するに、本発明の回転検出装置は、産業機械などの相対回転可能に同心配置される筒体と軸体とのうち、回転する側の部材の回転状態を検出する必要のある場所に使用することができる。
【００５９】
【発明の効果】
以上のように、請求項１または２の発明によれば、パルサリングの表面に対して所要の厚さの非磁性材が設けられているから、その厚みの分だけ磁性異物に対するパルサリングからの磁力による吸着力は弱くなる。そのため、パルサリングに磁性異物は付着しにくくなり、仮に付着しても吸着力は弱くなっているので、回転体の遠心力を受けることで磁性異物は剥れやすくなる。よって、磁性異物の付着を防止して、軸受装置における回転検出装置の性能を向上させる。
また、非磁性材の表面の摩擦係数が、パルサリングの被検知面の表面の摩擦係数よりも小さいので、非磁性材の表面はパルサリングの被検知面の表面よりも滑りやすくなる。その上、非磁性材の厚み分だけ磁力による吸着力は弱くなっているので、さらに磁性異物は付着しにくくなる。仮に磁性異物が付着しても磁性異物はより一層剥れやすくなる。
【００６０】
請求項２の発明によれば、パルサリングが磁性粉を分散混入したゴム材を磁化したものであっても、上記同様、回転体の遠心力を受けることで磁性異物はパルサリングから剥されやすくなる。
【００６２】
請求項３の発明によれば、上記請求項１または２のパルサリングを備える構成だから、パルサリングと磁気センサの対向隙間に異物が混在しにくくなり、結果的に磁気センサによる検出精度が向上する。
【図面の簡単な説明】
【図１】本発明の実施形態に係るハブユニットの縦断面図
【図２】図１の要部を拡大して示す断面図
【図３】図１の要部を拡大して示す分解斜視図
【図４】図１の要部の作用説明に供する断面図
【図５】本発明の他の実施形態に係るハブユニットの要部を拡大して示す断面図
【図６】本発明のさらに他の実施形態に係るハブユニットの縦断面図
【符号の説明】
５ 転がり軸受
８ 回転検出装置
１０ パルサリング
１１ 非磁性材
２０ 磁気センサ
５１ 内輪
５２ 外輪
μ1 パルサリングの被検知面の摩擦係数
μ2 非磁性材の表面の摩擦係数[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pulsar ring and a rotation detection device using the same.
[0002]
[Prior art]
Some anti-lock braking systems for automobiles include a wheel bearing device including a pulsar ring and a magnetic sensor as a rotation detection device. In the case of this rotation detection device, normally, a pulsar ring is attached to the rotation side where rotation is detected, and a magnetic sensor is attached to the fixed side where rotation is detected. The pulsar ring and the magnetic sensor are arranged to face each other in the axial direction or the radial direction.
[0003]
The surface to be detected for pulsar ring in such a rotation detection device is composed of S poles and N poles alternately magnetized in the circumferential direction, and corresponds to the rotation speed of the magnetic sensor with the rotation. Alternately generate magnetic forces of different polarities. The magnetic sensor can detect the rotation state on the rotation side based on the generated magnetic force.
[0004]
[Problems to be solved by the invention]
In the conventional pulsar ring, since the surface to be detected is exposed to the outside, magnetic foreign matters such as iron powder may adhere to the outer surface. In particular, the conventional pulsar ring has a surface to be detected made of a magnetized rubber material, so it is difficult to remove magnetic foreign matter. If the amount of magnetic foreign matter increases, the magnetic force decreases and the detection accuracy of the magnetic sensor decreases. Tend to.
[0005]
Therefore, the present invention has a problem to be solved that, when used as a rotation detection device together with a magnetic sensor, it makes it difficult for magnetic foreign matters such as iron powder to adhere to the detection surface of the pulsar ring and improves the rotation detection accuracy. To do.
[0006]
[Means for Solving the Problems]
The pulsar ring according to the present invention is a pulsar ring that constitutes a rotation detecting device in a pair with a magnetic sensor, and is provided with a detected surface in which different magnetic poles are provided alternately in the circumferential direction and the magnetic sensor is opposed to a predetermined circumferential position. A non-magnetic material is attached to the outer surface of the detected surface, and the friction coefficient of the surface of the non-magnetic material is set to be smaller than the friction coefficient of the surface of the detected surface. The thickness of the magnetic material is set so as to weaken the magnetic force of the pulsar ring and not to affect the detection accuracy of the magnetic sensor.
[0007]
This nonmagnetic material may be a film or a plate.
[0008]
According to the pulsar ring of the present invention, the nonmagnetic material is attached to the outer surface of the surface to be detected. Therefore, it becomes difficult for magnetic foreign substances to adhere. Even if a magnetic foreign material adheres, the attractive force is weakened, and therefore, the magnetic foreign material is easily peeled off from the pulsar ring by receiving the centrifugal force of the rotating body.
[0009]
In the case of the present invention, even if the magnetic pole is obtained by magnetizing a rubber material in which magnetic powder is dispersed and mixed, the magnetic foreign matter is easily peeled off from the pulsar ring by receiving the centrifugal force of the rotating body. .
[0010]
In the case of the present invention, since the friction coefficient of the surface of the nonmagnetic material is set to be smaller than the friction coefficient of the surface of the detected surface, the surface to which the magnetic foreign matter adheres becomes slippery. In addition, the magnetic attraction force is weakened by the thickness of the non-magnetic material, so that magnetic foreign substances are less likely to adhere. Even if the magnetic foreign matter adheres, the magnetic foreign matter is more easily peeled off.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The details of the present invention will be described based on embodiments shown in the drawings. The bearing device of the present invention is described as applied to an axle bearing device (hub unit). However, the present invention is not limited to an axle bearing device, and may be applied to other bearing devices.
[0012]
1 to 4 relate to the present embodiment, FIG. 1 is a longitudinal sectional view of the hub unit, FIG. 2 is an enlarged sectional view of the main part of FIG. 1, and FIG. 3 is an exploded view of the main part of FIG. FIG. 4 is a perspective view and FIG. 4 is a diagram for explaining the operation of the main part of FIG.
[0013]
In FIG. 1, 1 is a hub unit, 2 is an axle, and 3 is an axle case. The left side of the hub unit 1 shown in FIG. 1 is the vehicle outer side, and the right side is the vehicle inner side.
[0014]
The hub unit 1 includes a hub wheel 4 and a rolling bearing 5.
[0015]
The hub wheel 4 includes a radially outward flange 41 to which a wheel (not shown) is attached, and a hollow shaft portion 42.
[0016]
A rolling bearing 5 is fitted on the outer peripheral surface of the shaft portion 42 of the hub wheel 4.
[0017]
The rolling bearing 5 is a double-row outward angular ball bearing, and includes an inner ring 51 that is press-fitted into a small-diameter outer peripheral surface of the shaft portion 42 of the hub wheel 4, and a single outer ring 52 that has two rows of raceway grooves. , A plurality of balls 53 arranged in two rows, and two crown-shaped cages 54, 54. The large-diameter outer peripheral surface of the shaft portion 42 of the hub wheel 4 is used for the other inner ring of the rolling bearing 5.
[0018]
A radially outward flange 55 is provided on the outer periphery of the outer ring 52 of the rolling bearing 5. The rolling bearing 5 is fixed to the axle case 3 via the flange 55.
[0019]
In FIG. 1, 6 is an annular pulsar ring support, 7 is an annular magnetic sensor support, and 8 is a rotation detector.
[0020]
The pulsar ring support 6 includes a cylindrical portion 61 that is press-fitted and fitted to the outer peripheral surface of the shaft end of the inner ring 51 of the rolling bearing 5, and an annular portion 62 that extends outward from the shaft end of the cylindrical portion 61 in the radial direction. Prepare.
[0021]
The magnetic sensor support 7 closes the annular space between the inner and outer rings 51, 52 and the cylindrical part 71 extending on the outer side of the vehicle that is press-fitted to the outer peripheral part of the shaft end of the outer ring 52 of the rolling bearing 5. An annular portion 72 and a cylindrical portion 73 extending toward the vehicle inner side are provided. An elastic lip 74 that is in contact with the outer peripheral surface of the axle 2 is bonded to the inner peripheral surface of the cylindrical portion 73. A magnetic sensor mounting opening 75 penetrating inward and outward in the radial direction is provided at one circumference of the cylindrical portion 71.
[0022]
The rotation detection device 8 is an active type, and includes a pulsar ring 10 and a magnetic sensor 20.
[0023]
The pulsar ring 10 is formed in a ring shape using a magnetic material, and S and N poles, which are magnetic poles that are alternately different in the circumferential direction, are magnetized on a detection surface that faces the magnetic sensor 20. The pulsar ring 10 is obtained by magnetizing a rubber material in which magnetic powder is dispersed and mixed.
[0024]
The magnetic sensor 20 is a known Hall IC. Although not shown in detail, the Hall IC is configured by molding an IC chip with a protective cover made of synthetic resin. The outer shape of the magnetic sensor 20 has a rectangular parallelepiped shape, and the cord end 21 is drawn from the upper end thereof.
[0025]
The side surface facing the vehicle outer side in the axial direction of the magnetic sensor 20 is a detection surface, and the upper end surface of the magnetic sensor 20 is formed with an annular protruding piece 22 protruding in the axial direction.
[0026]
The pulsar ring 10 is attached to the annular portion 62 of the pulsar ring support 6, and the magnetic sensor 20 is inserted through the opening 75 of the magnetic sensor support 7 so that the detection surface thereof faces the pulsar ring 10 in the axial direction. And attached to the shaft end of the outer ring 52 of the rolling bearing 5.
[0027]
In the above configuration, the detection surface of the pulsar ring 10 and the detection surface of the magnetic sensor 20 face each other in the axial direction.
[0028]
Next, features of the present embodiment will be described.
[0029]
In the present embodiment, the nonmagnetic material 11 is attached to the detected surface of the pulsar ring 10.
[0030]
First, the thickness t of the nonmagnetic material 11 will be described.
[0031]
The nonmagnetic material 11 acts to weaken the magnetic force generated by the pulsar ring 10 corresponding to the thickness t, thereby weakening the attractive force due to the magnetic force on the magnetic foreign material on the surface. In this case, if the magnetic force after passing through the nonmagnetic material 11 is too small, the detection accuracy of the magnetic sensor 20 may be reduced. Therefore, the non-magnetic material 11 is configured to have a required thickness t that does not affect the detection accuracy of the magnetic sensor 20 while preventing adhesion of magnetic foreign substances.
[0032]
Next, the friction coefficient μ 2 on the surface of the nonmagnetic material 11 will be described.
[0033]
The friction coefficient μ 2 of the surface of the nonmagnetic material 11 is set to be smaller than the friction coefficient μ 1 of the detected surface of the pulsar ring 10.
[0034]
The smaller the friction coefficient μ 2 of the surface of the non-magnetic material 11 is, the more easily the surface of the non-magnetic material 11 is slipped, and the magnetic foreign matter is easily peeled off from the pulsar ring by the centrifugal force of the rotating body. The smaller the surface friction coefficient μ 2 , the better.
[0035]
Therefore, as a method of setting the friction coefficient μ 2 of the surface of the nonmagnetic material 11 to be smaller than the friction coefficient μ 1 of the detected surface of the pulsar ring 10, a method using a material having a small friction coefficient as the nonmagnetic material 11, There are three methods: a method of reducing the surface roughness (for example, ten-point average roughness of JISB0601) Rz of the magnetic material 11 and a method combining these two methods.
[0036]
Finally, the axial facing distance A between the nonmagnetic material 11 and the magnetic sensor 20 will be described.
[0037]
Conventionally (when there is no nonmagnetic material 11), the axial facing distance B between the detected surface of the pulsar ring 10 and the magnetic sensor 20 is a value determined according to the output from the required magnetic sensor or the type of the hub unit. Met.
[0038]
In the configuration in which the nonmagnetic material 11 is provided, the axial facing distance A between the nonmagnetic material 11 and the magnetic sensor 20 may be a value determined according to the required output from the magnetic sensor or the type of the hub unit. As in the prior art, the axial facing distance B between the detected surface of the pulsar ring 10 and the magnetic sensor 20 may be a value determined according to the output from the required magnetic sensor or the type of the hub unit.
[0039]
The operation will be described with reference to FIG.
[0040]
As shown in FIG. 4, when the magnetic foreign matter S adheres to the nonmagnetic material 11 of the pulsar ring 10, the magnetic foreign matter S is separated from the detected surface of the pulsar ring 10 by the thickness t of the nonmagnetic material 11. Become.
[0041]
At this time, when the magnetic foreign matter S is directly attached to the detected surface of the pulsar ring 10 without the nonmagnetic member 11, the magnetic force applied to the magnetic foreign matter S from the pulsar ring 10 is F 1 (direct magnetic force F 1 ). The magnetic force that is indirectly applied to the magnetic foreign substance S from the pulsar ring 10 via the nonmagnetic material 11 is F 2 (indirect magnetic force F 2 ). Naturally, direct magnetic force F 1 > indirect magnetic force F 2 .
[0042]
Further, the friction coefficient mu 1 of the surface of the pulser ring 10 and the friction coefficient of the surface of the non-magnetic material 11, μ 2, μ 1> μ from 2 relation holds, the magnetic foreign object S is the surface of the pulser ring 10 However, the surface of the nonmagnetic material 11 is slippery.
[0043]
Even if the magnetic foreign matter S adheres, the frictional force μ 2 F 2 when adhering via the nonmagnetic material 11 is naturally weaker than the frictional force μ 1 F 1 when adhering directly. The magnetic foreign matter S is easily separated from the surface of the non-magnetic material 11 of the pulsar ring 10 in response to the centrifugal force W accompanying the rotation of the inner ring 51.
[0044]
From the above, by providing the nonmagnetic material 11 on the pulsar ring 10, the magnetic foreign matter S is hardly attracted by the magnetic force of the pulsar ring 10, and the surface of the nonmagnetic material 11 is slippery. In response to the centrifugal force W, the pulsar ring 10 is easily peeled from the surface of the nonmagnetic material 11.
[0045]
Since the magnetic foreign matter S does not adhere to the pulsar ring 10, it is possible to prevent a decrease in the magnetic force of the pulsar ring 10.
[0046]
In addition, this invention is not limited only to the said embodiment, Various application and deformation | transformation can be considered.
[0047]
(1) In the above embodiment, an example is given in which the pulsar ring 10 and the magnetic sensor 20 are opposed in the axial direction, but they may be opposed in the radial direction as in the embodiment of FIG. The pulsar ring 10 and the pulsar ring support 6 are formed in a cylindrical shape, and the pulsar ring 10 is adhered to the outer peripheral surface of the pulsar ring support 6.
[0048]
A nonmagnetic material 11 is provided on the detected surface of the pulsar ring 10. Furthermore, the detection surface of the magnetic sensor 20 faces the detection surface of the pulsar ring 10 in the radial direction downward in the radial direction.
[0049]
(2) In the above embodiment, an example is given in which the magnetic sensor 20 is attached to and detached from the magnetic sensor support 7 from the radial direction, but although not shown, it may be attached and detached from the axial direction.
[0050]
(3) Although the example which provided the rotation detection apparatus 8 in the vehicle inner side edge part of the rolling bearing 5 is given in the said embodiment, it is set as the structure which provides the rotation detection apparatus 8 in the vehicle outer side edge part of the rolling bearing 5. May be.
[0051]
(4) In the above embodiment, the rolling bearing 5 uses the outer peripheral surface of the shaft portion 42 of the hub wheel 4 as one inner ring. For example, as in the embodiment shown in FIG. A hub unit 100 in which two inner rings 51, 56, each having a separate body 4 and the inner ring 56, are provided in parallel may be used.
[0052]
The rotation detection device 8 according to the present invention is attached to the vehicle outer side end portion of the rolling bearing 5 of such a hub unit 100.
[0053]
The magnetic sensor 20 is attached to the rolling bearing 5 with an attachment hole.
[0054]
The pulsar ring 10 is attached to the pulsar ring support 6 having an L-shaped cross section at the outer end of the inner ring 56 on the vehicle outer side. The pulsar ring 10 is attached to the vehicle out surface of the annular plate portion 62 of the pulsar ring support 6 so as to face the magnetic sensor 20. A nonmagnetic material 11 made of a nonmagnetic material is provided on the surface of the pulsar ring 10 facing the magnetic sensor 20.
[0055]
(5) In the case of the above embodiment, in the pulsar ring 10 and the magnetic sensor 20, the pulsar ring 10 is connected to the inner ring 51 via the pulsar ring support 6, and the magnetic sensor 20 is connected to the outer ring 52 via the magnetic sensor support 7. , Respectively, are fixed.
[0056]
A shaft body including the pulsar ring support 6 and the inner ring 51 can be formed, and a cylinder including the magnetic sensor support 7 and the outer ring 52 can be formed. The shaft body is on the rotating member side, and the cylindrical body is on the fixed member side.
[0057]
In this case, since the pulsar ring 10 and the magnetic sensor 20 only need to have a relative rotation relationship, one of the cylindrical body and the shaft body is the fixed member side, and the other is the rotating member side. One may be provided with a pulsar ring 10 and the other with a magnetic sensor 20.
[0058]
(6) In the above embodiment, the rotation detection device is used as a hub unit for a drive axle of an automobile. However, although not shown, it can also be used for a well-known hub unit for a driven axle. In addition, although a specific example is not given, in short, the rotation detection device of the present invention detects a rotation state of a rotating member among a cylindrical body and a shaft body that are concentrically arranged so as to be relatively rotatable, such as an industrial machine. Can be used wherever you need to.
[0059]
【Effect of the invention】
As described above, according to the first or second aspect of the present invention, the nonmagnetic material having a required thickness is provided on the surface of the pulsar ring. Adsorption power is weakened. For this reason, the magnetic foreign matter is less likely to adhere to the pulsar ring, and even if it is attached, the attractive force is weakened. Therefore, the magnetic foreign matter is easily peeled by receiving the centrifugal force of the rotating body. Therefore, adhesion of a magnetic foreign material is prevented and the performance of the rotation detection device in the bearing device is improved.
In addition, since the friction coefficient of the surface of the nonmagnetic material is smaller than the friction coefficient of the surface of the detected surface of the pulsar ring, the surface of the nonmagnetic material becomes slippery than the surface of the detected surface of the pulsar ring. In addition, the magnetic attraction force is weakened by the thickness of the non-magnetic material, so that magnetic foreign substances are less likely to adhere. Even if the magnetic foreign matter adheres, the magnetic foreign matter is more easily peeled off.
[0060]
According to the invention of claim 2, even if the pulsar ring is made by magnetizing a rubber material in which magnetic powder is dispersed and mixed, the magnetic foreign matter is easily peeled off from the pulsar ring by receiving the centrifugal force of the rotating body as described above.
[0062]
According to the third aspect of the present invention, since the pulsar ring according to the first or second aspect is provided, it is difficult for foreign matters to be mixed in the facing gap between the pulsar ring and the magnetic sensor, and as a result, the detection accuracy by the magnetic sensor is improved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a hub unit according to an embodiment of the present invention. FIG. 2 is a sectional view showing an enlarged main part of FIG. 1. FIG. 3 is an exploded perspective view showing an enlarged main part of FIG. 4 is a cross-sectional view for explaining the operation of the main part of FIG. 1. FIG. 5 is an enlarged cross-sectional view showing the main part of a hub unit according to another embodiment of the present invention. Sectional view of the hub unit according to the embodiment
5 Rolling bearing 8 Rotation detection device 10 Pulsar ring 11 Non-magnetic material 20 Magnetic sensor 51 Inner ring 52 Outer ring μ 1 Friction coefficient of detected surface of pulsar ring μ 2 Friction coefficient of non-magnetic material surface

Claims (3)

磁気センサと対となって回転検出装置を構成するパルサリングであって、
周方向交互に異なる磁極が設けられかつ円周所定位置に前記磁気センサが対向される被検知面を有し、
この被検知面の外表面に、非磁性材が付着され、
前記非磁性材の表面の摩擦係数が、前記被検知面の表面の摩擦係数よりも小に設定されるとともに、
前記非磁性材の厚さが、前記パルサリングの磁力を弱くするとともに、前記磁気センサの検知精度に影響を与えないように設定されている、ことを特徴とするパルサリング。A pulsar ring that forms a rotation detection device in pairs with a magnetic sensor,
A magnetic pole that is different in the circumferential direction is provided, and has a detected surface that faces the magnetic sensor at a predetermined circumferential position,
A non-magnetic material is attached to the outer surface of the detected surface,
The friction coefficient of the surface of the nonmagnetic material is set to be smaller than the friction coefficient of the surface of the detected surface,
The pulsar ring is characterized in that the thickness of the non-magnetic material is set so as to weaken the magnetic force of the pulsar ring and not affect the detection accuracy of the magnetic sensor. 請求項１に記載のパルサリングにおいて、
前記磁極が、磁性粉を分散混入したゴム材を磁化することにより得られるものである、ことを特徴とするパルサリング。The pulsar ring according to claim 1,
A pulsar ring, wherein the magnetic pole is obtained by magnetizing a rubber material in which magnetic powder is dispersed and mixed. 相対回転可能に同心状に配置される筒体と軸体とのうち、回転部材側に取り付けられるパルサリングと、非回転部材側に取り付けられて前記パルサリングに対向される磁気センサとからなる回転検出装置であって、
前記パルサリングが、周方向交互に互いに異なる磁極が設けられかつ円周所定位置に前記磁気センサが対向される被検知面を有し、
この被検知面の外表面に、非磁性材が付着され、
前記非磁性材の表面の摩擦係数が、前記被検知面の表面の摩擦係数よりも小に設定されるとともに、
前記非磁性材の厚さが、前記パルサリングの磁力を弱くするとともに、前記磁気センサの検知精度に影響を与えないように設定されていることを特徴とする回転検出装置。A rotation detection device comprising a pulsar ring attached to the rotating member side and a magnetic sensor attached to the non-rotating member side and opposed to the pulsar ring, out of a cylindrical body and a shaft body that are concentrically disposed so as to be relatively rotatable. Because
The pulsar ring has a detected surface in which magnetic poles different from each other in the circumferential direction are provided and the magnetic sensor is opposed to a predetermined circumferential position,
A non-magnetic material is attached to the outer surface of the detected surface,
The friction coefficient of the surface of the nonmagnetic material is set to be smaller than the friction coefficient of the surface of the detected surface,
The rotation detecting device, wherein the thickness of the non-magnetic material is set so as to weaken the magnetic force of the pulsar ring and not affect the detection accuracy of the magnetic sensor.
JP2001276196A 2001-09-12 2001-09-12 Pulsaring and rotation detector Expired - Fee Related JP5103704B2 (en)

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