JP2004036816A

JP2004036816A - Rolling bearing device

Info

Publication number: JP2004036816A
Application number: JP2002197071A
Authority: JP
Inventors: Tomohiro Ishii; 石井　知博
Original assignee: Koyo Seiko Co Ltd
Current assignee: Koyo Seiko Co Ltd
Priority date: 2002-07-05
Filing date: 2002-07-05
Publication date: 2004-02-05
Anticipated expiration: 2022-07-05
Also published as: JP4178312B2

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem of a high manufacturing cost resulting from an increase in the number of processes because of needing after-machining such as lathe turning due to low product accuracy caused by forming a supporting shaft by hot forging in a rolling bearing device. <P>SOLUTION: Particularly a first inner ring member 11 out of an outer ring member 2 and an inner ring member 5 is formed in hollow cylinder shape with prescribed cross-sectional shape using a tubular material. Weight is thereby reduced in comparison with the conventional case of forming the inner ring member 5 in solid cross section, and rotational torque is reduced as a driven wheel. With the constitution of arranging a pulser ring 19 and a detector 22 inside the rolling bearing device 1, a vehicle speed detection system is improved, and harness 24 additionally provided at the detector 22 is led out of a center hole of the first inner ring member 11 to facilitate its handling. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、転がり軸受装置に関する。
【０００２】
【従来の技術】
図５に示すように、従動輪側の車軸に用いられる転がり軸受装置は、車体側に非回転に支持される外輪部材５０と、この外輪部材５０の径方向内方に複列の玉５１ａ，５１ｂを介して軸心回りに回転自在に支持される内輪部材５２とを有する。この内輪部材５２は、ブレーキディスクおよびタイヤホイールを取付けるためのハブホイール５３と、車軸５５とを有する。ハブホイール５３はその外周面に、一方列の玉５１ａの内輪軌道面を有する。車軸５５はその外周面に、他方列の玉５１ｂの内輪軌道面を有する。
【０００３】
外輪部材５０は、その内周面に、両列の玉５１ａ，５１ｂの外輪軌道面を有する。車軸５５は、熱間鍛造によって中実断面に形成され、ハブホイール５３の中心穴に挿通される軸部５４を有する。
【０００４】
【発明が解決しようとする課題】
上記従来の転がり軸受装置では、車軸５５は中実断面であり、また熱間鍛造によって形成されている。従ってその製造に際しては、大圧力を加えるためのプレス機を必要とするなど、高価で大掛かりな設備を必要とする。また、熱間鍛造で製作した車軸５５は、製品精度が確保しにくいので、旋削、研磨などの後加工が多く必要であり、工程数が増加してしまう。
【０００５】
【課題を解決するための手段】
本発明の転がり軸受装置は、軸心回りに回転自在な外輪部材と、前記外輪部材に対して径方向内側で同心に配置されて車体側に非回転に支持される第１、第２内輪部材と、前記外輪部材と各内輪部材との間に介装される複数列の転動体とを含み、前記外輪部材、前記第１内輪部材は管状の素材を冷間鍛造により中空円筒状に形成されており、前記第２内輪部材は、前記第１内輪部材の挿入が可能な中心穴を有し、前記第２内輪部材の中心穴に挿入される第１内輪部材の端部が、前記第２内輪部材の端面にかしめられ、前記外輪部材の軸方向一端部に、外輪部材の開口部を覆って外輪部材と回転一体なカバーが設けられ、前記カバーの内側面に、環状の回転信号発信部材が設けられ、第１内輪部材側に、前記外輪部材の回転数を、回転信号発信部材からの信号に基づいて検出する検出器が設けられている。
【０００６】
また本発明の転がり軸受装置は、軸心回りに回転自在な第１、第２内輪部材と、前記第１、第２内輪部材に対して径方向外側で同心に配置されて車体側に非回転に支持される外輪部材と、前記外輪部材と各内輪部材との間に介装される複数列の転動体とを含み、前記外輪部材、前記第１内輪部材は管状の素材を冷間鍛造により中空円筒状に形成されており、前記第２内輪部材は、前記第１内輪部材の挿入が可能な中心穴を有し、前記第２内輪部材の中心穴に挿入される第１内輪部材の端部が、前記第２内輪部材の端面にかしめられ、前記第１内輪部材の軸方向一端部に、第１内輪部材の開口部を覆って第１内輪部材と回転一体なカバーが設けられ、前記カバーの内側面に、環状の回転信号発信部材が設けられ、前記外輪部材側に、前記第１内輪部材の回転数を、回転信号発信部材からの信号に基づいて検出する検出器が設けられている。
【０００７】
上記各構成のように、外輪部材、前記第１、第２内輪部材のうち第１内輪部材を管状の素材から中空円筒状に形成することによれば、転がり軸受装置の製造に際して、大掛かりな設備を必要としない。また転動体の軌道面を必要な精度とするための研磨加工時間を短縮することができる。このため、製品の製造が容易になるとともに、製造コストが低減される。
また内輪部材、外輪部材が軸心回りに回転する場合、その回転トルクが軽減されることになる。さらに、回転信号発信部材および検出器は、軸受内部に配置され、外部からの影響を受けにくくなり、従って、回転速度検出のための信頼度が向上する。
【０００８】
【発明の実施の形態】
以下、本発明の実施形態に係る転がり軸受装置を、図面を参照して説明する。図では、転がり軸受装置を、従動輪側の車軸用転がり軸受装置に適用させている。図１は本発明の第１の実施形態に係る転がり軸受装置の全体構成を示す断面図である。図示のように、この転がり軸受装置１は、筒状の外輪部材２と、転動体として２列の玉３，４と、筒状の内輪部材５とを有する。
【０００９】
外輪部材２は、その内周面に複列の外輪軌道面を有する。この外輪部材２は、取付けフランジ６を有する。この取付けフランジ６は、外輪部材２の軸心方向一端側、すなわち車両アウタ側に、径方向外向きに突出して形成される。この取付けフランジ６に、ブレーキディスク７およびタイヤホイール８が重ねて取付けられる。
【００１０】
このような外輪部材２は、平板状の素材から冷間鍛造によって一体的に形成される。取付けフランジ６には、円周方向等配位置に挿通孔９が形成され、これら挿通孔９にハブボルト１０が圧入されている。ブレーキディスク７およびタイヤホイール８は、これらハブボルト１０を挿通して取付けフランジ６に取付けられる。
【００１１】
内輪部材５は、それぞれ外輪部材２と同心に配置される第１内輪部材１１と第２内輪部材１２とから構成される。第１内輪部材１１は、外輪部材２の径方向内方に配置される軸部１３と、他端側すなわち車両インナ側に設けられて車体側に非回転に取付けられる固定フランジ１４とを有する。この第１内輪部材１１の軸部１３は、その車両アウタ側に小径部１３ａを有し、その外周には環状の凹部１５が形成されている。この第１内輪部材１１は、平板状の素材から冷間鍛造によって一体的に形成される。この凹部１５に、前記第２内輪部材１２が嵌着されている。なお、この第２内輪部材１２は、熱間鍛造によって形成されて、軌道面が研磨加工によって仕上げられる。
【００１２】
第１内輪部材１１の軸部１３の外周面に、他方の外輪軌道面に対応する内輪軌道面が形成され、第２内輪部材１２の外周面に一方の外輪軌道面に対応する内輪軌道面が形成されている。第１内輪部材１１はまた、その車両アウタ側端部に、第２内輪部材１２の端面に対してかしめられたかしめ部１６を有する。
【００１３】
外輪部材２の車両アウタ側開口１８を覆うカバー１７が、外輪部材２の開口１８に内嵌嵌着され、このカバー１７の内面に、環状の回転信号発信部材としてのパルサーリング１９が固着されている。カバー１７は、外輪部材２の開口１８に内嵌嵌着される筒状の嵌着部１７ａと、ブレーキディスク７およびタイヤホイール８を取付けフランジ６に取付ける際のガイドとなる、嵌着部１７ａよりも大径のガイド部１７ｂとを有する。パルサーリング１９は、図２に示すように、環状の平板に、円周方向等配位置に多数の開口２０を形成してなる。
【００１４】
第１内輪部材１１の小径部１３ａ内周面に、車両アウタ側に突出して拡径する取付け部材２１が固定され、この取付け部材２１のパルサーリング１９対向部に、外輪部材２の回転数を、パルサーリング１９からの信号に基づいて検出する検出器２２が埋設するように取付けられている。取付け部材２１には、検出器２２に接続される配線２３が導出され、この配線２３の先端には、ハーネス２４が接続されている。図の２５は、外輪部材２と第１内輪部材１１の間の環状空間を車両インナ側で密封するシール装置を示す。
【００１５】
上記構成の転がり軸受装置１の製造手順を説明する。まず、外輪部材２に各列の玉３，４を、冠形保持器３ａ，４ａに保持させた状態で組付ける。続いて第１内輪部材１１を車両インナ側から外輪部材２に挿入するように組付けるとともに、第２内輪部材１２を車両アウタ側から組付ける。このとき、第１内輪部材１１の小径部１３ａが、第２内輪部材１２の中心穴１２ａに対して円滑に挿通されるように、両内輪部材１１，１２を径方向位置で位置合わせする。
【００１６】
第１内輪部材１１の小径部１３ａが、第２内輪部材１２の中心穴１２ａに挿通された状態で、第１内輪部材１１の端面を拡径するようにして第２内輪部材１２の端面に対してかしめ、第１内輪部材１１にかしめ部１６を形成する。このように、第１内輪部材１１の端面を第２内輪部材１２の端面に対してかしめることで、第２内輪部材１２は、第１内輪部材１１から抜止めされ、両内輪部材１１，１２が軸心回りに回転一体とされるとともに、両列の玉３，４に対して所定の予圧が付与される。
【００１７】
その後、取付け部材２１の基部を第１内輪部材１１の小径部１３ａに嵌込み、予めパルサーリング１９を固定してあるカバー１７を外輪部材２の車両アウタ側開口１８に嵌着するようにして転がり軸受装置１を製造する。
【００１８】
なお、ブレーキディスク７およびタイヤホイール８は、それぞれの中心穴７ａ，８ａに、カバー１７のガイド部１７ｂを挿通するようにし、かつハブボルト１０を挿通して取付けフランジ６に重ねるようにして取付け、ハブボルト１０に不図示のナットを螺着して固定する。このようにして製造した転がり軸受装置１１では、車両が走行すると、不図示の車輪の回転とともに、外輪部材２が軸心回りに回転する。
【００１９】
ところで、外輪部材２、および内輪部材５（第１内輪部材１１）は、管状の素材を用いてこれを所定の断面形状を有する中空円筒状に形成しているので、内輪部材５を従来のように中実断面に形成する場合に比べて重量が軽くでき、従動輪として、回転トルクの低減が可能となる。
【００２０】
また、外輪部材２および内輪部材５は、管状の素材を用いてこれを所定の断面形状を有する中空円筒状に形成しているので、従来のように内輪部材５を熱間鍛造によって形成する場合に比べて、小規模で安価な設備であっても対応でき、しかも高精度に外輪部材２および第１内輪部材１１を形成することができる。
【００２１】
すなわち熱間鍛造の場合は製品の表面精度も低く、特に玉３，４の内輪軌道面を必要な精度とするための研磨加工時間を長く必要とし、場合によっては内輪軌道面以外の部分も研磨加工を必要としていた。これに対して、管状の素材を用いて冷間鍛造によって外輪部材２および第１内輪部材１１を形成する場合は、製品の精度がよいので、外輪軌道面および内輪軌道面を必要な精度とするための研磨加工時間が短縮でき、外輪軌道面および内輪軌道面以外の部分の研磨加工をほとんど必要としない。これによって、製造コストを大幅に低減し得ることになる。
【００２２】
また従来、ハブホイール５３の軌道部、ハブフランジおよびガイド部材は、熱間鍛造によって一体に形成されていたため、上記と同様製造に際して大掛かりな装置が必要であった。しかしこの実施形態のように、ガイド部１７ｂを有するカバー１７を、外輪部材２および内輪部材５と別部材として冷間鍛造によって形成することで、熱間鍛造部分の容量が小さくなり、従来に比べて安価で小規模な装置で製造することができる。また、このカバー１７は、第１内輪部材１１のかしめ部１６を被覆する機能を有しているため、第２内輪部材１２の端面とかしめ部１６の間から泥水等が侵入するのを防止する機能を有する。
【００２３】
さらに、パルサーリング１９および検出器２２を転がり軸受装置１内部に配置した構成により、外部に露出することがないので、車速の検出制度を向上させることができるとともに、検出器２２に付設するハーネス２４を第１内輪部材１１の中心穴から引出せ、かつその取回しが容易になる。
【００２４】
次に、図３に基づいて、本発明の第２の実施形態を説明する．この転がり軸受装置１は、筒状の外輪部材２と、転動体として２列の玉３，４と、筒状の内輪部材５とを有する。
【００２５】
外輪部材２は、その内周面に複列の外輪軌道面を有する。この外輪部材２は、固定フランジ１４を有する。この固定フランジ１４は、外輪部材２の軸心方向他端側、すなわち車両インナ側に、径方向外向きに突出して形成される。この固定フランジ１４は、車体側に非回転に取付けられる。このような外輪部材２は、平板状の素材から冷間鍛造によって一体的に形成される。
【００２６】
内輪部材５は、それぞれ外輪部材２と同心に配置される第１内輪部材１１と第２内輪部材１２とから構成される。第１内輪部材１１は、外輪部材２の径方向内方に配置される軸部１３と、その車両アウタ側に設けられてブレーキディスク７およびタイヤホイール８が重ねて取付けられる取付けフランジ６を有する。
【００２７】
この第１内輪部材１１の軸部１３は、その車両インナ側に小径部１３ａを有し、その外周には環状の凹部１５が形成されている。この第１内輪部材１１は、平板状の素材から冷間鍛造によって一体的に形成される。この凹部１５に、第２内輪部材１２が嵌着されている。なお、この第２内輪部材１２は、熱間鍛造によって形成され、軌道面が研磨加工によって仕上げられる。
取付けフランジ６には、円周方向等配位置に挿通孔９が形成され、これら挿通孔９にハブボルト１０が圧入されている。ブレーキディスク７およびタイヤホイール８は、これらハブボルト１０を挿通して取付けフランジ６に取付けられる。
【００２８】
第１内輪部材１１の軸部１３の外周面に、一方の外輪軌道面に対応する内輪軌道面が形成され、第２内輪部材１２の外周面に他方の外輪軌道面に対応する内輪軌道面が形成されている。第１内輪部材１１はまた、その車両インナ側端部に、第２内輪部材１２の端面に対してかしめられるかしめ部１６を有する。
【００２９】
第１内輪部材１１の車両アウタ側開口３０を覆うカバー３１が、第１内輪部材１１の開口３０に内嵌嵌着され、このカバー３１の内面に、回転信号発信部材としてのパルサーリング１９が固着されている。カバー３１は、第１内輪部材１１の開口３０に内嵌嵌着される筒状の嵌着部３１ａと、ブレーキディスク７およびタイヤホイール８を取付けフランジ６に取付ける際のガイドとなる、嵌着部３１ａよりも大径のガイド部３１ｂとを有する。パルサーリング１９の構成は、上記第１の実施形態と同様である。
【００３０】
第１内輪部材１１の内空部に、車両アウタ側に突出して拡径する取付け部材２１が挿通され、この取付け部材２１のパルサーリング１９対向部に、外輪部材２の回転数を、パルサーリング１９からの信号に基づいて検出する検出器２２が埋設するように取付けられている。取付け部材２１の車両インナ側端部は第１内輪部材１１から車両インナ側に突出し、この突出部分が、外輪部材２の車両インナ側開口３３を覆う別のカバー３４に挿通してこれに保持されている。取付け部材２１の車両インナ側から、検出器２２に接続される配線２３が導出され、この配線２３の先端には、ハーネス２４が接続されている。図の２５は、外輪部材２と第１内輪部材１１の間の環状空間を車両アウタ側で密封するシール装置を示す。
【００３１】
上記構成の転がり軸受装置１の製造手順を説明する。まず、外輪部材２に各列の玉３，４を、冠形保持器３ａ，４ａに保持させた状態で組付ける。続いて第１内輪部材１１を車両アウタ側から外輪部材２に挿入するように組付けるとともに、第２内輪部材１２を車両インナ側から組付ける。このとき、第１内輪部材１１の小径部１３ａが、第２内輪部材１２の中心穴１２ａに対して円滑に挿通されるように、両内輪部材１１，１２を径方向位置で位置合わせする。
【００３２】
第１内輪部材１１の小径部１３ａが、第２内輪部材１２の中心穴１２ａに挿通された状態で、第１内輪部材１１の端面を拡径するようにして第２内輪部材１２の端面に対してかしめ、第１内輪部材１１にかしめ部１６を形成する。このように、第１内輪部材１１の端面を第２内輪部材１２の端面に対してかしめることで、第２内輪部材１２は、第１内輪部材１１から抜止めされ、両内輪部材１１，１２が軸心回りに回転一体とされるとともに、両列の玉３，４に対して所定の予圧が付与される。
【００３３】
その後、取付け部材２１を第１内輪部材１１の車両アウタ側からその内空部に挿入するとともに、カバー３１を、第１内輪部材１１の開口３０に嵌着させ、取付け部材２１の端部を、外輪部材２の車両インナ側開口３３を覆うカバー３４に挿通してこれに位置保持させる。このとき、パルサーリング１９と検出器２２との軸心方向間距離が所定の値となるように確保し、転がり軸受装置１を製造する。
【００３４】
なお、ブレーキディスク７およびタイヤホイール８は、それぞれの中心穴７ａ，８ａに、カバー３１のガイド部３１ｂを挿通するようにし、かつハブボルト１０を挿通して取付けフランジ６に重ねるようにして取付け、ハブボルト１０に不図示のナットを螺着して固定する。このようにして製造した転がり軸受装置１１では、車両が走行すると、不図示の車輪の回転とともに、内輪部材５が軸心回りに回転する。
【００３５】
ところで、外輪部材２、および内輪部材５（第１内輪部材１１）は、管状の素材を用いてこれを所定の断面形状を有する中空円筒状に形成しているので、内輪部材５を従来のように中実断面に形成する場合に比べて重量が軽くでき、従動輪として、回転トルクの低減が可能となる。
【００３６】
また、外輪部材２および特に第１内輪部材１１は、管状の素材を用いてこれを所定の断面形状を有する中空円筒状に形成しているので、従来のように内輪部材５を熱間鍛造によって形成する場合に比べて、小規模で安価な設備であっても対応でき、しかも高精度に外輪部材２および第１内輪部材１１を形成することができる。
【００３７】
すなわち熱間鍛造の場合は製品の表面精度も低く、特に玉３，４の内輪軌道面を必要な精度とするための研磨加工時間を長く必要とし、場合によっては内輪軌道面以外の部分も研磨加工を必要としていた。これに対して、管状の素材を用いて冷間鍛造によって外輪部材２および第１内輪部材１１を形成する場合は、製品の精度がよいので、外輪軌道面および内輪軌道面を必要な精度とするための研磨加工時間が短縮でき、外輪軌道面および内輪軌道面以外の部分の研磨加工をほとんど必要としない。これによって、製造コストを大幅に低減し得ることになる。
【００３８】
また従来、ハブホイール５３の軌道部、ハブフランジおよびガイド部材は、熱間鍛造によって一体に形成されていたため、上記と同様製造に際して大掛かりな装置が必要であった。しかしこの実施形態のように、ガイド部３１ｂを有するカバー３１を、外輪部材２および内輪部材５と別部材として冷間鍛造によって形成することで、熱間鍛造部分の容量が小さくなり、従来に比べて安価で小規模な装置で製造することができる。また、このカバー３１は、内輪部材５内に泥水等が侵入するのを防止する機能を有する。
【００３９】
さらに、パルサーリング１９および検出器２２を転がり軸受装置１内部に配置した構成により、車速の検出制度を向上させることができるとともに、検出器２２に付設するハーネス２４を第１内輪部材１１の中心穴から引出せ、かつその取回しが容易になる。
【００４０】
なお、上記各実施形態においてパルサーリング１９は、カバー１７，３１の内側面にカバー１７，３１とは別部材として固定するようにしたが、図４に示すように、カバー１７，３１と一体としてもよい。この場合、カバー１７，３１の内側面外周部に多数の凸部３５を形成するようにすれば、カバー１７，３１が軸心回りに回転することにより、回転信号が検出器２２に出力される。
【００４１】
また、上記各実施形態において、第２内輪部材１２は熱間鍛造によって形成したが、これに限定されるものではなく、外輪部材２、内輪部材５と同様に平板状または円筒状の素材を冷間鍛造によって形成してもよい。
【００４２】
【発明の効果】
以上の説明から明らかな通り、本発明によれば、高価で大掛かりな設備が不要となるばかりでなく、内輪部材あるいは外輪部材に対して転動体の軌道面を必要な精度とするための研磨加工あるいは旋削加工などの後加工時間を短縮もしくは省略でき、もって製造コストの低減を図り得る。
【図面の簡単な説明】
【図１】本発明の第１の実施形態に係る転がり軸受装置の全体断面図である。
【図２】同じくパルサーリングの単体斜視図である。
【図３】本発明の第２の実施形態に係る転がり軸受装置の全体断面図である。
【図４】別のパルサーリングの実施形態を示す斜視図である。
【図５】従来の転がり軸受装置の全体断面図である。
【符号の説明】
１　　　転がり軸受装置
２　　　外輪部材
１０　　ハブフランジ
１１　　第１内輪部材
１２　　第２内輪部材
１６　　かしめ部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rolling bearing device.
[0002]
[Prior art]
As shown in FIG. 5, a rolling bearing device used for an axle on a driven wheel side includes an outer ring member 50 supported non-rotatably on a vehicle body side, and a plurality of rows of balls 51 a radially inward of the outer ring member 50. And an inner ring member 52 rotatably supported around the axis via 51b. The inner ring member 52 has a hub wheel 53 for mounting a brake disk and a tire wheel, and an axle 55. The hub wheel 53 has an inner raceway surface of one row of balls 51a on the outer peripheral surface thereof. The axle 55 has an inner raceway surface of the other row of balls 51b on its outer peripheral surface.
[0003]
The outer race member 50 has outer raceway surfaces of the balls 51a and 51b in both rows on its inner peripheral surface. The axle 55 is formed in a solid cross section by hot forging, and has a shaft portion 54 that is inserted into a center hole of the hub wheel 53.
[0004]
[Problems to be solved by the invention]
In the above-mentioned conventional rolling bearing device, the axle 55 has a solid cross section and is formed by hot forging. Therefore, the production thereof requires expensive and large-scale equipment such as a press machine for applying a large pressure. In addition, since the axle 55 manufactured by hot forging cannot easily ensure product accuracy, many post-processing operations such as turning and polishing are required, and the number of steps increases.
[0005]
[Means for Solving the Problems]
A rolling bearing device according to the present invention comprises an outer ring member rotatable around an axis, and first and second inner ring members which are arranged concentrically radially inward with respect to the outer ring member and supported non-rotatably on the vehicle body side. And a plurality of rows of rolling elements interposed between the outer ring member and each inner ring member, wherein the outer ring member and the first inner ring member are formed into a hollow cylindrical shape by cold forging a tubular material. The second inner race member has a center hole into which the first inner race member can be inserted, and the end of the first inner race member inserted into the center hole of the second inner race member is the second inner race member. A cover that is swaged to the end surface of the inner ring member and is provided at one end in the axial direction of the outer ring member so as to cover the opening of the outer ring member and is rotatable with the outer ring member, and an annular rotation signal transmitting member is provided on the inner surface of the cover. Is provided on the first inner ring member side to transmit a rotation signal of the outer ring member to a rotation signal. Detector is provided for detecting, based on a signal from wood.
[0006]
Further, the rolling bearing device of the present invention is provided with first and second inner ring members rotatable around an axis, and concentrically arranged radially outward with respect to the first and second inner ring members, so as not to rotate toward the vehicle body. The outer ring member supported by the, including a plurality of rows of rolling elements interposed between the outer ring member and each inner ring member, the outer ring member, the first inner ring member by cold forging a tubular material The second inner race member is formed in a hollow cylindrical shape, the second inner race member has a center hole through which the first inner race member can be inserted, and the end of the first inner race member inserted into the center hole of the second inner race member A portion is caulked to an end surface of the second inner ring member, and a cover is provided at one end in the axial direction of the first inner ring member so as to cover an opening of the first inner ring member and rotate integrally with the first inner ring member; An annular rotation signal transmitting member is provided on an inner surface of the cover, and the first inner ring member is provided on the outer ring member side. The rotational speed of the member, the detector is provided for detecting from the output signals of the rotational signaling member.
[0007]
By forming the first inner ring member of the outer ring member and the first and second inner ring members into a hollow cylindrical shape from a tubular material as in each of the above configurations, a large-scale facility is required in manufacturing the rolling bearing device. Do not need. In addition, it is possible to reduce the time required for polishing for making the raceway surfaces of the rolling elements have the required accuracy. For this reason, manufacture of a product becomes easy and manufacturing cost is reduced.
When the inner ring member and the outer ring member rotate around the axis, the rotation torque is reduced. Furthermore, the rotation signal transmitting member and the detector are arranged inside the bearing and are less susceptible to external influences, and therefore, the reliability for detecting the rotation speed is improved.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a rolling bearing device according to an embodiment of the present invention will be described with reference to the drawings. In the figure, the rolling bearing device is applied to an axle rolling bearing device on the driven wheel side. FIG. 1 is a cross-sectional view showing the entire configuration of the rolling bearing device according to the first embodiment of the present invention. As shown in the figure, the rolling bearing device 1 has a cylindrical outer ring member 2, two rows of balls 3 and 4 as rolling elements, and a cylindrical inner ring member 5.
[0009]
The outer race member 2 has a double-row outer raceway surface on its inner peripheral surface. The outer ring member 2 has a mounting flange 6. The mounting flange 6 is formed so as to protrude radially outward on one end side of the outer race member 2 in the axial center direction, that is, on the vehicle outer side. A brake disk 7 and a tire wheel 8 are mounted on the mounting flange 6 in an overlapping manner.
[0010]
Such an outer ring member 2 is integrally formed by cold forging from a flat material. Insertion holes 9 are formed in the mounting flange 6 at equal positions in the circumferential direction, and hub bolts 10 are press-fitted into these insertion holes 9. The brake disc 7 and the tire wheel 8 are mounted on the mounting flange 6 through the hub bolts 10.
[0011]
The inner ring member 5 includes a first inner ring member 11 and a second inner ring member 12 which are respectively arranged concentrically with the outer ring member 2. The first inner race member 11 has a shaft portion 13 arranged radially inward of the outer race member 2 and a fixed flange 14 provided on the other end side, that is, on the vehicle inner side, and non-rotatably mounted on the vehicle body side. The shaft portion 13 of the first inner ring member 11 has a small diameter portion 13a on the vehicle outer side, and an annular concave portion 15 is formed on the outer periphery. The first inner ring member 11 is integrally formed by cold forging from a flat material. The second inner ring member 12 is fitted into the recess 15. The second inner race member 12 is formed by hot forging, and the raceway surface is finished by polishing.
[0012]
An inner raceway surface corresponding to the other outer raceway surface is formed on the outer periphery surface of the shaft portion 13 of the first inner race member 11, and an inner raceway surface corresponding to one outer raceway surface is formed on the outer periphery surface of the second inner race member 12. Is formed. The first inner ring member 11 also has a caulking portion 16 caulked to the end surface of the second inner ring member 12 at the vehicle outer end.
[0013]
A cover 17 that covers the vehicle outer side opening 18 of the outer ring member 2 is fitted inside the opening 18 of the outer ring member 2, and a pulsar ring 19 as an annular rotation signal transmitting member is fixed to the inner surface of the cover 17. I have. The cover 17 has a cylindrical fitting portion 17a fitted inside the opening 18 of the outer ring member 2 and a fitting portion 17a serving as a guide when the brake disc 7 and the tire wheel 8 are mounted on the mounting flange 6. Also has a large diameter guide portion 17b. As shown in FIG. 2, the pulsar ring 19 is formed by forming a large number of openings 20 at equal positions in a circumferential direction on an annular flat plate.
[0014]
A mounting member 21 that protrudes toward the vehicle outer side and expands in diameter is fixed to the inner peripheral surface of the small-diameter portion 13a of the first inner ring member 11, and the rotation speed of the outer ring member 2 is A detector 22 for detecting based on a signal from the pulsar ring 19 is mounted so as to be embedded. A wiring 23 connected to the detector 22 is led out from the mounting member 21, and a harness 24 is connected to a tip of the wiring 23. FIG. 25 shows a sealing device for sealing an annular space between the outer ring member 2 and the first inner ring member 11 on the vehicle inner side.
[0015]
A manufacturing procedure of the rolling bearing device 1 having the above configuration will be described. First, the balls 3 and 4 in each row are mounted on the outer ring member 2 while being held by the crown-shaped retainers 3a and 4a. Subsequently, the first inner race member 11 is assembled so as to be inserted into the outer race member 2 from the vehicle inner side, and the second inner race member 12 is assembled from the vehicle outer side. At this time, the two inner ring members 11 and 12 are aligned at radial positions such that the small diameter portion 13a of the first inner ring member 11 is smoothly inserted into the center hole 12a of the second inner ring member 12.
[0016]
With the small-diameter portion 13a of the first inner ring member 11 being inserted into the center hole 12a of the second inner ring member 12, the end surface of the first inner ring member 11 is enlarged with respect to the end surface of the second inner ring member 12. The caulking portion 16 is formed on the first inner race member 11 by caulking. In this way, by caulking the end surface of the first inner race member 11 against the end surface of the second inner race member 12, the second inner race member 12 is prevented from coming off from the first inner race member 11, and both inner race members 11, 12 Are integrally rotated about the axis, and a predetermined preload is applied to the balls 3 and 4 in both rows.
[0017]
Thereafter, the base of the mounting member 21 is fitted into the small diameter portion 13a of the first inner race member 11, and the cover 17 to which the pulsar ring 19 is fixed in advance is fitted to the vehicle outer side opening 18 of the outer race member 2 to roll. The bearing device 1 is manufactured.
[0018]
The brake disc 7 and the tire wheel 8 are mounted such that the guide portions 17b of the cover 17 are inserted into the respective center holes 7a and 8a, and the hub bolts 10 are inserted so as to overlap the mounting flanges 6. A nut (not shown) is screwed to 10 and fixed. In the rolling bearing device 11 thus manufactured, when the vehicle travels, the outer ring member 2 rotates around the axis with the rotation of the wheels (not shown).
[0019]
By the way, the outer ring member 2 and the inner ring member 5 (first inner ring member 11) are formed from a tubular material into a hollow cylindrical shape having a predetermined cross-sectional shape. Therefore, the weight can be reduced as compared with the case of forming a solid section, and the rotation torque can be reduced as a driven wheel.
[0020]
Further, since the outer ring member 2 and the inner ring member 5 are formed into a hollow cylindrical shape having a predetermined cross-sectional shape using a tubular material, the inner ring member 5 is formed by hot forging as in the related art. As compared with the above, even small-scale and inexpensive equipment can be used, and the outer ring member 2 and the first inner ring member 11 can be formed with high precision.
[0021]
In other words, in the case of hot forging, the surface accuracy of the product is low, and in particular, a long polishing processing time is required to make the inner raceway surfaces of the balls 3 and 4 necessary accuracy. In some cases, a portion other than the inner raceway surface is also polished. Processing was required. On the other hand, when the outer ring member 2 and the first inner ring member 11 are formed by cold forging using a tubular material, the accuracy of the product is good, so that the outer ring raceway surface and the inner ring raceway surface have the required accuracy. Polishing time can be shortened, and polishing of portions other than the outer raceway surface and the inner raceway surface is almost unnecessary. This can significantly reduce manufacturing costs.
[0022]
Conventionally, the raceway portion of the hub wheel 53, the hub flange, and the guide member have been integrally formed by hot forging, so that a large-scale apparatus is required for manufacturing as described above. However, by forming the cover 17 having the guide portion 17b as a separate member from the outer ring member 2 and the inner ring member 5 by cold forging as in this embodiment, the capacity of the hot forged portion is reduced, and compared with the conventional case. It can be manufactured with low cost and small scale equipment. Further, since the cover 17 has a function of covering the caulked portion 16 of the first inner ring member 11, it prevents muddy water or the like from entering between the end surface of the second inner ring member 12 and the caulked portion 16. Has functions.
[0023]
Furthermore, since the pulsar ring 19 and the detector 22 are arranged inside the rolling bearing device 1 and are not exposed to the outside, the accuracy of detecting the vehicle speed can be improved, and the harness 24 attached to the detector 22 can be improved. Can be pulled out from the center hole of the first inner ring member 11 and the handling thereof can be facilitated.
[0024]
Next, a second embodiment of the present invention will be described with reference to FIG. The rolling bearing device 1 includes a cylindrical outer ring member 2, two rows of balls 3 and 4 as rolling elements, and a cylindrical inner ring member 5.
[0025]
The outer race member 2 has a double-row outer raceway surface on its inner peripheral surface. This outer ring member 2 has a fixing flange 14. The fixing flange 14 is formed to protrude radially outward on the other end side of the outer race member 2 in the axial center direction, that is, on the vehicle inner side. The fixed flange 14 is non-rotatably attached to the vehicle body. Such an outer ring member 2 is integrally formed by cold forging from a flat material.
[0026]
The inner ring member 5 includes a first inner ring member 11 and a second inner ring member 12 which are respectively arranged concentrically with the outer ring member 2. The first inner ring member 11 has a shaft portion 13 disposed radially inward of the outer ring member 2 and a mounting flange 6 provided on the vehicle outer side and on which the brake disk 7 and the tire wheel 8 are mounted in an overlapping manner.
[0027]
The shaft portion 13 of the first inner ring member 11 has a small diameter portion 13a on the vehicle inner side, and an annular concave portion 15 is formed on the outer periphery. The first inner ring member 11 is integrally formed by cold forging from a flat material. The second inner ring member 12 is fitted into the recess 15. The second inner ring member 12 is formed by hot forging, and the raceway surface is finished by polishing.
Insertion holes 9 are formed in the mounting flange 6 at equal positions in the circumferential direction, and hub bolts 10 are press-fitted into these insertion holes 9. The brake disc 7 and the tire wheel 8 are mounted on the mounting flange 6 through the hub bolts 10.
[0028]
An inner raceway surface corresponding to one outer raceway surface is formed on the outer periphery surface of the shaft portion 13 of the first inner race member 11, and an inner raceway surface corresponding to the other outer raceway surface is formed on the outer periphery surface of the second inner race member 12. Is formed. The first inner race member 11 also has a caulking portion 16 at the vehicle inner side end thereof, which is swaged against the end surface of the second inner race member 12.
[0029]
A cover 31 that covers the vehicle outer side opening 30 of the first inner ring member 11 is fitted inside the opening 30 of the first inner ring member 11, and the pulsar ring 19 as a rotation signal transmitting member is fixed to the inner surface of the cover 31. Have been. The cover 31 has a cylindrical fitting portion 31 a fitted inside the opening 30 of the first inner race member 11 and a fitting portion serving as a guide when the brake disc 7 and the tire wheel 8 are mounted on the mounting flange 6. And a guide portion 31b having a larger diameter than that of the guide portion 31a. The configuration of the pulsar ring 19 is the same as in the first embodiment.
[0030]
A mounting member 21 projecting toward the vehicle outer side and increasing in diameter is inserted into the inner space of the first inner ring member 11, and the rotation speed of the outer ring member 2 is set to the pulsar ring 19 at a portion of the mounting member 21 facing the pulsar ring 19. Detector 22 for detecting based on the signal from is mounted so as to be embedded. The inner end of the mounting member 21 on the vehicle inner side protrudes from the first inner ring member 11 toward the vehicle inner side, and this protruding portion is inserted into and held by another cover 34 that covers the vehicle inner side opening 33 of the outer ring member 2. ing. A wiring 23 connected to the detector 22 is led out from the vehicle inner side of the attachment member 21, and a harness 24 is connected to a tip of the wiring 23. Reference numeral 25 in the drawing shows a sealing device for sealing the annular space between the outer ring member 2 and the first inner ring member 11 on the vehicle outer side.
[0031]
A manufacturing procedure of the rolling bearing device 1 having the above configuration will be described. First, the balls 3 and 4 in each row are mounted on the outer ring member 2 while being held by the crown-shaped retainers 3a and 4a. Subsequently, the first inner race member 11 is assembled so as to be inserted into the outer race member 2 from the vehicle outer side, and the second inner race member 12 is assembled from the vehicle inner side. At this time, the two inner ring members 11 and 12 are aligned at radial positions such that the small diameter portion 13a of the first inner ring member 11 is smoothly inserted into the center hole 12a of the second inner ring member 12.
[0032]
With the small-diameter portion 13a of the first inner ring member 11 being inserted into the center hole 12a of the second inner ring member 12, the end surface of the first inner ring member 11 is enlarged with respect to the end surface of the second inner ring member 12. The caulking portion 16 is formed on the first inner race member 11 by caulking. In this way, by caulking the end surface of the first inner race member 11 against the end surface of the second inner race member 12, the second inner race member 12 is prevented from coming off from the first inner race member 11, and both inner race members 11, 12 Are integrally rotated about the axis, and a predetermined preload is applied to the balls 3 and 4 in both rows.
[0033]
Thereafter, the mounting member 21 is inserted into the inner space of the first inner race member 11 from the vehicle outer side, and the cover 31 is fitted into the opening 30 of the first inner race member 11. The outer ring member 2 is inserted into a cover 34 that covers the vehicle inner side opening 33 and is held in position. At this time, the distance between the pulsar ring 19 and the detector 22 in the axial direction is ensured to be a predetermined value, and the rolling bearing device 1 is manufactured.
[0034]
The brake disc 7 and the tire wheel 8 are mounted such that the guide portions 31b of the cover 31 are inserted into the respective center holes 7a and 8a, and the hub bolts 10 are inserted so as to overlap the mounting flanges 6. A nut (not shown) is screwed to 10 and fixed. In the rolling bearing device 11 manufactured in this manner, when the vehicle travels, the inner ring member 5 rotates around the axis with the rotation of the wheels (not shown).
[0035]
By the way, the outer ring member 2 and the inner ring member 5 (first inner ring member 11) are formed from a tubular material into a hollow cylindrical shape having a predetermined cross-sectional shape. Therefore, the weight can be reduced as compared with the case of forming a solid section, and the rotation torque can be reduced as a driven wheel.
[0036]
Further, since the outer race member 2 and particularly the first inner race member 11 are formed into a hollow cylindrical shape having a predetermined sectional shape using a tubular material, the inner race member 5 is formed by hot forging as in the related art. Compared to the case of forming, it is possible to cope with even small-scale and inexpensive equipment, and it is possible to form the outer ring member 2 and the first inner ring member 11 with high precision.
[0037]
In other words, in the case of hot forging, the surface accuracy of the product is low, and in particular, a long polishing processing time is required to make the inner raceway surfaces of the balls 3 and 4 necessary accuracy. In some cases, a portion other than the inner raceway surface is also polished. Processing was required. On the other hand, when the outer ring member 2 and the first inner ring member 11 are formed by cold forging using a tubular material, the accuracy of the product is good, so that the outer ring raceway surface and the inner ring raceway surface have the required accuracy. Polishing time can be shortened, and polishing of portions other than the outer raceway surface and the inner raceway surface is almost unnecessary. This can significantly reduce manufacturing costs.
[0038]
Conventionally, the raceway portion of the hub wheel 53, the hub flange, and the guide member have been integrally formed by hot forging, so that a large-scale apparatus is required for manufacturing as described above. However, by forming the cover 31 having the guide portion 31b by cold forging as a separate member from the outer ring member 2 and the inner ring member 5 as in this embodiment, the capacity of the hot forged portion is reduced, and compared with the conventional case. It can be manufactured with low cost and small scale equipment. The cover 31 has a function of preventing muddy water or the like from entering the inner ring member 5.
[0039]
Further, the configuration in which the pulsar ring 19 and the detector 22 are disposed inside the rolling bearing device 1 can improve the detection accuracy of the vehicle speed, and the harness 24 attached to the detector 22 can be provided in the center hole of the first inner ring member 11. , And can be easily handled.
[0040]
In the above embodiments, the pulsar ring 19 is fixed to the inner surfaces of the covers 17 and 31 as a separate member from the covers 17 and 31. However, as shown in FIG. Is also good. In this case, if a large number of convex portions 35 are formed on the outer peripheral portions of the inner surfaces of the covers 17 and 31, the rotation signals are output to the detector 22 by the rotation of the covers 17 and 31 around the axis. .
[0041]
Further, in each of the above embodiments, the second inner ring member 12 is formed by hot forging. However, the present invention is not limited to this, and a flat or cylindrical material is cooled similarly to the outer ring member 2 and the inner ring member 5. It may be formed by cold forging.
[0042]
【The invention's effect】
As is apparent from the above description, according to the present invention, not only is expensive and large-scale equipment unnecessary, but also a polishing process for obtaining the required accuracy of the raceway surface of the rolling element with respect to the inner ring member or the outer ring member. Alternatively, the post-processing time such as turning can be shortened or omitted, so that the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is an overall sectional view of a rolling bearing device according to a first embodiment of the present invention.
FIG. 2 is a single perspective view of the pulsar ring.
FIG. 3 is an overall sectional view of a rolling bearing device according to a second embodiment of the present invention.
FIG. 4 is a perspective view showing another pulsar ring embodiment.
FIG. 5 is an overall sectional view of a conventional rolling bearing device.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 rolling bearing device 2 outer ring member 10 hub flange 11 first inner ring member 12 second inner ring member 16 caulked portion

Claims

An outer ring member rotatable about an axis, first and second inner ring members arranged concentrically radially inward with respect to the outer ring member and supported non-rotatably on the vehicle body side, the outer ring member and each inner ring Including a plurality of rows of rolling elements interposed between the member and
The outer ring member, the first inner ring member is formed in a hollow cylindrical shape by cold forging a tubular material,
The second inner ring member has a center hole into which the first inner ring member can be inserted,
An end of the first inner race member inserted into the center hole of the second inner race member is swaged to an end surface of the second inner race member,
At one end in the axial direction of the outer ring member, a cover that is integrally rotatable with the outer ring member is provided to cover an opening of the outer ring member,
An annular rotation signal transmitting member is provided on the inner surface of the cover,
A detector is provided on the first inner ring member side to detect a rotation speed of the outer ring member based on a signal from a rotation signal transmitting member.
A rolling bearing device, characterized in that:

First and second inner ring members rotatable about an axis; outer ring members arranged concentrically radially outward with respect to the first and second inner ring members and supported non-rotatably on the vehicle body side; Including a plurality of rows of rolling elements interposed between the outer ring member and each inner ring member,
The outer ring member and the first inner ring member are formed in a hollow cylindrical shape by cold forging a tubular material,
The second inner ring member has a center hole into which the first inner ring member can be inserted,
An end of the first inner ring member inserted into the center hole of the second inner ring member is caulked to an end surface of the second inner ring member,
At one end in the axial direction of the first inner ring member, a cover that covers the opening of the first inner ring member and is integrally rotatable with the first inner ring member is provided,
An annular rotation signal transmitting member is provided on the inner surface of the cover,
On the outer ring member side, a detector that detects the number of rotations of the first inner ring member based on a signal from a rotation signal transmitting member is provided.
A rolling bearing device, characterized in that: