【書類名】 明細書
【発明の名称】 車輪支持用転がり軸受ユニットの組立方法
【特許請求の範囲】
【請求項１】 内周面に第一、第二の外輪軌道を形成した外径側軌道輪部材と、外周面に第一、第二の内輪軌道を形成した内径側軌道輪部材と、これら第一、第二の内輪軌道と上記第一、第二の外輪軌道との間にそれぞれ複数個ずつ転動自在に設けた転動体とを備え、上記内径側軌道輪部材は、その外周面に直接又は別の内輪を介して上記第一の内輪軌道を形成した軸部材と、その外周面に上記第二の内輪軌道を形成した内輪とから成り、この内輪は、上記軸部材の端部に外嵌し、更にこの軸部材の端部に形成した円筒部を直径方向外方に塑性変形させる事で形成したかしめ部によりその軸方向端面を抑え付けられる事で、上記軸部材に対し支持固定されている車輪支持用転がり軸受ユニットを組み立てるのに際し、先ず、上記軸部材の周囲に上記外径側軌道輪部材を配置しつつ、上記第一の内輪軌道と上記第一の外輪軌道との間に上記複数個の転動体を設置し、次いで、上記内輪を上記軸部材の端部に、上記複数個の転動体を上記第二の内輪軌道と上記第二の外輪軌道との間に設置しつつ外嵌し、次いで、上記円筒部を直径方向外方に塑性変形させて上記かしめ部を形成し、このかしめ部により上記内輪の軸方向端面を抑え付ける車輪支持用転がり軸受ユニットの組立方法に於いて、上記内輪を上記軸部材の端部に外嵌する作業を、上記内径側軌道輪部材と上記外径側軌道輪部材とを相対的に回転若しくは揺動させつつ行なう事を特徴とする車輪支持用転がり軸受ユニットの組立方法。
【請求項２】 内周面に第一、第二の外輪軌道を形成した外径側軌道輪部材と、外周面に第一、第二の内輪軌道を形成した内径側軌道輪部材と、これら第一、第二の内輪軌道と上記第一、第二の外輪軌道との間にそれぞれ複数個ずつ転動自在に設けた転動体とを備え、上記内径側軌道輪部材は、その外周面に直接又は別の内輪を介して上記第一の内輪軌道を形成した軸部材と、その外周面に上記第二の内輪軌道を形成した内輪とから成り、この内輪は、上記軸部材の端部に外嵌し、更にこの軸部材の端部に形成した円筒部を直径方向外方に塑性変形させる事で形成したかしめ部によりその軸方向端面を抑え付けられる事で、上記軸部材に対し支持固定されている車輪支持用転がり軸受ユニットを組み立てるのに際し、先ず、上記軸部材の周囲に上記外径側軌道輪部材を配置しつつ、上記第一の内輪軌道と上記第一の外輪軌道との間に上記複数個の転動体を設置し、次いで、上記内輪を上記軸部材の端部に、上記複数個の転動体を上記第二の内輪軌道と上記第二の外輪軌道との間に設置しつつ外嵌し、次いで、上記円筒部を直径方向外方に塑性変形させて上記かしめ部を形成し、このかしめ部により上記内輪の軸方向端面を抑え付ける車輪支持用転がり軸受ユニットの組立方法に於いて、上記かしめ部により上記内輪の軸方向端面を抑え付ける作業を、上記外径側軌道輪部材を回転若しくは揺動させる事により、この外径側軌道輪部材と上記内径側軌道輪部材とを相対的に回転若しくは揺動させつつ行なう事を特徴とする車輪支持用転がり軸受ユニットの組立方法。
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】
この発明は、自動車の車輪を懸架装置に対して回転自在に支持する為の車輪支持用転がり軸受ユニットの組立方法の改良に関する。
【０００２】
【従来の技術】
自動車の車輪を懸架装置に対して回転自在に支持する為に、車輪支持用転がり軸受ユニットを使用する。この様な車輪支持用転がり軸受ユニットの構造の１例に就いて、後述する本発明の実施の形態の第１例の説明で使用する、図１の構造を参照しつつ説明する。この図１に示した車輪支持用転がり軸受ユニットは、外径側軌道輪部材である外輪１の内径側に、内径側軌道輪部材であるハブ２を、複列の円すいころ軸受３、４により回転自在に支持している。このうちの外輪１は、内周面の一端（自動車への組み付け状態で車両の幅方向外側となる端で、図１の左端）側部分に、第一列の円すいころ軸受３を構成する為の、円すい凹面状の第一の外輪軌道５を、同じく他端（自動車への組み付け状態で車両の幅方向中央側となる端で、図１の右端）側部分に、第二列の円すいころ軸受４を構成する為の、円すい凹面状の第二の外輪軌道６を、それぞれ形成すると共に、外周面に懸架装置に支持固定する為の取付部７を設けている。
【０００３】
又、上記ハブ２は、軸部材であるハブ本体８と内輪９とを組み合わせて成る。このうちのハブ本体８は、外周面の一端部に車輪を支持する為のフランジ１０を、同じく中間部に上記第一列の円すいころ軸受３を構成する為の、円すい凸面状の第一の内輪軌道１１を、同じく他端部にこの第一の内輪軌道１１を形成した部分よりも小径の段部１３を、それぞれ形成している。尚、上記第一の内輪軌道１１は、上記ハブ本体８の中間部に外嵌した別の内輪の外周面に形成する場合もある。又、上記内輪９は、外周面に上記第二列の円すいころ軸受４を構成する為の、円すい凸面状の第二の内輪軌道１２を有する。この様な内輪９は、上記段部１３に圧入外嵌すると共に、上記ハブ本体８の他端部に設けたかしめ部１４により、上記段部１３の段差面１５に向け抑え付けている。この様なかしめ部１４は、上記ハブ本体８の他端部で、少なくとも上記段部１３に圧入（締り嵌めで）外嵌した内輪９の他端面よりも軸方向に突出する部分に形成した円筒部１６を、揺動プレス加工等により直径方向外方に塑性変形させて形成する。
【０００４】
又、上記第一、第二の外輪軌道５、６と上記第一、第二の内輪軌道１１、１２との間には、それぞれが転動体である複数個ずつの円すいころ１７、１７を、それぞれ第一、第二の保持器１８、１９により転動自在に保持した状態で設けている。これにより、上記第一列、第二列の両円すいころ軸受３、４を構成している。尚、トラック等の重量の嵩む自動車用の車輪支持用転がり軸受ユニットの場合には、上記転動体として上述の様な円すいころ１７、１７を使用するが、乗用車等の比較的重量の軽い自動車用の車輪支持用転がり軸受ユニットの場合には、上記転動体として、玉を使用する場合が多い。又、図示の例では、上記外輪１の一端部に支持したシールリング２０により、上記複数個の円すいころ１７、１７を設けた空間２１の一端開口部を密閉している。尚、図示は省略するが、この空間２１の他端開口部も、別のシールリングにより密閉するか、或は、上記外輪１の他端部に装着したカバーにより塞ぐ。これにより、上記空間２１に封入したグリース等の潤滑剤が外部に漏洩するのを防止すると共に、外部からこの空間２１内に泥水等の異物が侵入するのを防止する。
【０００５】
上述の様に構成する車輪支持用転がり軸受ユニットを組み立てる際には、先ず、上記ハブ本体８の周囲に上記外輪１を配置すると共に、上記第一の内輪軌道１１と上記第一の外輪軌道５との間に上記複数個の円すいころ１７、１７を、上記第一の保持器１８により保持した状態で設ける。これと共に、上記シールリング２０を、上記円筒状の空間２１の一端開口部を塞ぐ状態で装着する。尚、ここまでの組立作業の順序は、車輪支持用転がり軸受ユニットの構造によって、多少異なる。
【０００６】
例えば、図１に示した車輪支持用転がり軸受ユニットの場合には、先ず、上記第一の内輪軌道１１の周囲に上記複数個の円すいころ１７、１７を、上記第一の保持器１８に保持した状態で配置する。尚、この状態で、上記第一の内輪軌道１１と上記各円すいころ１７、１７の転動面とに、グリース等の潤滑剤を塗布しておく。又、上記外輪１の一端部に、上記シールリング２０を外嵌固定しておく。図示の例の場合、このシールリング２０は、断面Ｌ字形で全体を円環状に形成した芯金２２と、同じく円環状に形成して、この芯金２２の内径側部分に焼き付け、接着等により固定した弾性材２３とから成る。上記外輪１の一端部には、このうちの芯金２２を外嵌固定する。
【０００７】
次いで、この様にシールリング２０を外嵌固定した上記外輪１に上記ハブ本体８を、その他端部側から挿通し、この外輪１をハブ本体８の周囲に配置する。この挿通作業により、上記第一の外輪軌道５が上記第一の保持器１８により保持した複数個の円すいころ１７、１７の転動面と当接する。尚、この外輪１の挿通作業を行なうのに先立ち、上記第一の外輪軌道５にも、グリース等の潤滑剤を塗布しておく。又、上述の様に外輪１をハブ本体８の周囲に配置する事に伴い、上記シールリング２０を構成する弾性材２３に設けた複数本のシールリップの先端縁が、上記ハブ本体８の一端寄り部外周面及び前記フランジ１０の基端部側面に当接（運転時には摺接）し、上記円筒状の空間２１の一端開口部を密閉する。
【０００８】
尚、図１に示した構造の場合、上記シールリング２０の内径側部分を構成する弾性材２３の内径は、上記第一の保持器１８の外径、並びにこの第一の保持器１８により保持した複数個の円すいころ１７、１７の外接円の直径よりも大きくしている。この為、上述の様に外輪１の内側に上記ハブ本体８を、その他端部側から挿通する際に、この外輪１の一端部に外嵌固定した上記シールリング２０の内径側を、上記第一の保持器１８及びこの第一の保持器１８により保持した複数個の円すいころ１７、１７を通過させる事ができる。この為、図１に示した構造の場合、上記シールリング２０を上記外輪１に装着する作業は、この外輪１の内側に上記ハブ本体８を挿通する作業に先立って行なう。
【０００９】
尚、この様にシールリング２０を外輪１に予め装着しておく事は、上記シールリング２０を構成する部材のうち、（上記芯金２２を除いた）上記弾性材２３の内径を、上記第一の保持器１８により保持した複数個の円すいころ１７、１７の外接円の直径（この外接円の直径よりも上記第一の保持器１８の外径の方が大きい場合には、この第一の保持器１８の外径）よりも少しだけ小さくした場合でも、実現できる。即ち、この場合には、上記弾性材２３の内径側部分が上記第一の保持器１８により保持した複数個の円すいころ１７、１７（或は、この第一の保持器１８）の外径面に沿って弾性変形する事により、上記シールリング２０の内径側を上記第一の保持器１８及びこの第一の保持器１８により保持した複数個の円すいころ１７、１７が通過する事を許容する。
【００１０】
上述の様にハブ本体８の周囲に外輪１を配置しつつ、上記第一の内輪軌道１１と上記第一の外輪軌道５との間に上記第一の保持器１８により保持した複数個の円すいころ１７、１７を設けると共に、上記シールリング２０により前記空間２１の一端開口部を塞いだならば、次いで、前記内輪９を上記ハブ本体８の他端部に外嵌する。この外嵌作業に先立って、この内輪９の外周面に形成した第二の内輪軌道１２の周囲に複数個の円すいころ１７、１７を、前記第二の保持器１９により保持した状態で設置しておく。尚、この状態で、上記第二の内輪軌道１２と上記各円すいころ１７、１７の転動面とに、グリース等の潤滑剤を塗布しておく。そして、この状態で上記内輪９を、上記ハブ本体８の他端部に形成した段部１３に、締り嵌めで外嵌する。そして、この外嵌作業に伴って、上記第二の保持器１９により保持した複数個の円すいころ１７、１７の転動面を、上記外輪１の他端寄り部内周面に形成した第二の外輪軌道６に当接させる。尚、上記外嵌作業に先立って、この第二の外輪軌道６にも、グリース等の潤滑剤を塗布しておく。次いで、上記ハブ本体８の他端部に形成した円筒部１６を、揺動プレス加工等により直径方向外方に塑性変形させて、かしめ部１４を形成する。そして、このかしめ部１４により上記内輪９の他端面を軸方向に抑え付ける事で、この内輪９を上記ハブ本体８に固定する。
【００１１】
そして、上述の様に形成したかしめ部１４により、上記内輪９の他端面を押圧し、この内輪９の一端面を前記段差面１５に押し付ける事に基づき、転がり軸受ユニットの（正又は負）の内部隙間を所望値にする。尚、この様に、上記内輪９を上記ハブ本体８の段部１３に外嵌し、更に上記かしめ部１４を形成する際には、上記第二の保持器１９により保持した複数個の円すいころ１７、１７の転動面と上記第二の外輪軌道６及び上記第二の内輪軌道１２との当接部、並びに、前記第一の保持器１８により保持した複数個の円すいころ１７、１７の転動面と前記第一の外輪軌道５及び前記第一の内輪軌道１１との当接部に、それぞれ上記各円すいころ１７、１７の母線方向に亙る滑りが生じる。
【００１２】
【発明が解決しようとする課題】
上述した様な従来の車輪支持用転がり軸受ユニットの組立方法の場合には、次の様な不都合を生じる可能性があった。即ち、上述した様に内輪９を段部１３に外嵌すると、第一、第二の保持器１８、１９により保持した複数個の円すいころ１７、１７の転動面と、この転動面に当接する各軌道５、６、１１、１２の表面とが、各面の母線方向に擦れ合う。この為、これら各面同士の当接部から前述したグリース等の潤滑剤が退避し、これら各当接部が金属接触に近い状態となり、これら各当接部の摩擦係数が大きくなる。この為、上記内輪９を段部１３に外嵌したり、上記かしめ部１４により上記内輪９の端面を押圧する際に、上記各当接部で滑らかな滑りが行なわれなくなり、上記車輪支持用転がり軸受ユニットの内部隙間の値が所望値通りにならなくなる。例えば、この内部隙間を負とすべき場合にも、正の内部隙間のままとなり、各列の円すいころ軸受３、４に所望の予圧を付与できなくなる可能性がある。
【００１３】
特に、図１に示した車輪支持用転がり軸受ユニットの様に、複数個の転動体が円すいころ１７、１７である場合には、これら各円すいころ１７、１７の中心軸が正規の自転軸に対して傾くスキューが発生すると、上述した様な問題が顕著になる。何れにしても、車輪用転がり軸受ユニットの内部隙間が所望値からずれると、この車輪用転がり軸受ユニットが所期の性能を発揮できなくなる為、好ましくない。
本発明の組立方法は、上述の様な事情に鑑みて、車輪支持用転がり軸受ユニットの内部隙間を適正値に設定できる様にすべく発明したものである。
【００１４】
【課題を解決するための手段】
本発明の車輪支持用転がり軸受ユニットの組立方法により組み立てる車輪支持用転がり軸受ユニットは、従来から知られている車輪支持用転がり軸受ユニットと同様に、内周面に第一、第二の外輪軌道を形成した外径側軌道輪部材と、外周面に第一、第二の内輪軌道を形成した内径側軌道輪部材と、これら第一、第二の内輪軌道と上記第一、第二の外輪軌道との間にそれぞれ複数個ずつ転動自在に設けた転動体とを備える。そして、上記内径側軌道輪部材は、その外周面に直接又は別の内輪を介して上記第一の内輪軌道を形成した軸部材と、その外周面に上記第二の内輪軌道を形成した内輪とから成る。又、この内輪は、上記軸部材の端部に圧入外嵌し、更にこの軸部材の端部に形成した円筒部を直径方向外方に塑性変形させる事で形成したかしめ部によりその軸方向端面を抑え付けられる事で、上記軸部材に対し支持固定されている。
【００１５】
この様な車輪支持用転がり軸受ユニットを組み立てる際に、先ず、上記軸部材の周囲に上記外径側軌道輪部材を配置しつつ、上記第一の内輪軌道と上記第一の外輪軌道との間に上記複数個の転動体を設ける。次いで、上記内輪を上記軸部材の端部に、複数個の転動体を上記第二の内輪軌道と上記第二の外輪軌道との間に設置しつつ外嵌する。そして、最後に、上記円筒部を直径方向外方に塑性変形させて上記かしめ部を形成し、このかしめ部により上記内輪の軸方向端面を抑え付ける。
【００１６】
特に、本発明のうちの請求項１に記載した車輪支持用転がり軸受ユニットの組立方法に於いては、上記内輪を上記軸部材の端部に外嵌する作業を、上記内径側軌道輪部材と上記外径側軌道輪部材とを相対的に回転若しくは揺動させつつ行なう。
又、請求項２に記載した車輪支持用転がり軸受ユニットの組立方法に於いては、上記かしめ部により上記内輪の軸方向端面を抑え付ける作業を、上記外径側軌道輪部材を回転若しくは揺動させる事により、この外径側軌道輪部材と上記内径側軌道輪部材とを相対的に回転若しくは揺動させつつ行なう。
【００１７】
【作用】
上述した様な本発明の車輪支持用転がり軸受ユニットの組立方法によれば、車輪支持用転がり軸受ユニットの内部隙間を所望の値にしつつ組立作業を行なえて、この車輪支持用転がり軸受ユニットに所期の性能を発揮させる事ができる。
【００１８】
【発明の実施の形態】
図１〜２は、請求項１に対応する、本発明の実施の形態の第１例を示している。尚、図１に示した車輪支持用転がり軸受ユニットの構造に就いては前述した通りであるから、この車輪支持用転がり軸受ユニットの構造に就いての説明は省略若しくは簡略にし、以下、本例の特徴部分である、組立方法に就いて説明する。尚、以下に説明する組立作業に先立って、複数個の円すいころ１７、１７の転動面、並びに第一、第二の内輪、外輪各軌道１１、１２、５、６には、グリース等の潤滑剤を塗布しておく。先ず、ハブ本体８の周囲に外輪１を配置しつつ、この外輪１の一端寄り部分（図１の左端寄り部分、図２の下端寄り部分）の内周面に形成した第一の外輪軌道５と上記ハブ本体８の中間部外周面に形成した第一の内輪軌道１１との間に、第一の保持器１８により保持した複数個の円すいころ１７、１７を組み付ける。これと共に、これら各円すいころ１７、１７を設置した空間２１の一端開口部を塞ぐ状態でシールリング２０を装着する。ここまでの組立方法は、前述した従来の組立方法の場合と同様である。
【００１９】
次いで、前述した従来の組立方法の場合と同様に、内輪９の外周面に形成した第二の内輪軌道１２の周囲に、第二の保持器１９により保持した複数個の円すいころ１７、１７を配置した状態で、上記内輪９を上記ハブ本体８の他端部（図１の右端部、図２の上端部）外周面に形成した段部１３に締り嵌めで外嵌（圧入）する。特に、本例の組立方法の場合、上記内輪９を上記段部１３に外嵌する作業を、この内輪９及び上記ハブ本体８と上記外輪１とを、相対的に揺動（往復回転）若しくは回転（一方向回転）させつつ行なう。この為に、図示の例では、上記ハブ本体８を作業台２４等の上面に支持した状態で、上記外輪１をこのハブ本体８に対して揺動（ハブ本体８を中心に往復回転）させる様にしている。この様に外輪１を揺動させつつ、上記内輪９を上記段部１３に、この内輪９の他端面に突き当てた圧入治具２５によりこの内輪９の一端面が上記ハブ本体８の外周面に形成した段差面１５に突き当たるまで外嵌する。
【００２０】
そして、この様に上記内輪９を上記段部１３に外嵌すると共に、上記第二の保持器１９により保持した複数個の円すいころ１７、１７の転動面を、上記外輪１の他端寄り部内周面に形成した第二の外輪軌道６に当接させる。この様に内輪９を段部１３に外嵌する際には、上記各円すいころ１７、１７の転動面と上記各軌道６、１２の表面との当接部に、これら各面の母線方向に亙る滑りが生じる。但し、本例の場合、この様に内輪９を段部１３に外嵌する際に、この内輪９及び上記ハブ本体８に対して上記外輪１を揺動させている為、上記各円すいころ１７、１７が上記各軌道６、１２上を転動する。この為、これら各円すいころ１７、１７が転動する事に基づいて、前記グリース等の潤滑剤がこれら各円すいころ１７、１７の転動面と上記各軌道６、１２との当接部に入り込み、これら各当接部に上記潤滑剤の膜が十分に形成される。従って、これら各当接部に於ける潤滑状態が良好になる。言い換えれば、本例の場合には、前述した従来の場合の様に、これら各当接部から上記潤滑剤が退避して、これら各当接部の接触状態が金属接触に近い状態になる事を防止できる。又、上記各円すいころ１７、１７が上記各軌道５、６、１１、１２上を転動する事により、これら各円すいころ１７、１７に調心作用が働くので、これら各円すいころ１７、１７の中心軸が正規の自転軸に対して傾く事を防止できる。
【００２１】
この結果、次いで、上記ハブ本体８の他端部に設けた円筒部１６を、揺動プレス加工等により直径方向外方に塑性変形させてかしめ部１４を形成し、このかしめ部１４により上記内輪９の他端面を抑え付ければ（押圧すれば）、所望の内部隙間を有する車輪支持用転がり軸受ユニットを得られる。又、仮に上記かしめ部１４の形成作業の際に、上記各円すいころ１７、１７の転動面と上記各軌道５、６、１１、１２との当接部で、これら各円すいころ１７、１７の母線方向に亙る滑りが生じても、滑り摩擦力を低く抑える事ができる。この為、上記各円すいころ１７、１７を含んで構成する、第一列、第二列の各円すいころ軸受３、４の内部隙間を所望の値として、必要に応じて予圧を付与できる。この結果、これら各円すいころ軸受３、４を含む車輪支持用転がり軸受ユニットに所期の性能を発揮させる事ができる。
【００２２】
次に、図３は、請求項２に対応する、本発明の実施の形態の第２例を示している。本例の場合、内輪９をハブ本体８の他端部外周面に設けた段部１３に圧入外嵌するまでの組立作業は、前述した従来の組立方法の場合と同様である。特に、本例の場合、上記ハブ本体８の他端部に設けた円筒部１６を直径方向外方に塑性変形させてかしめ部１４を形成し、このかしめ部１４により上記内輪９の他端面を抑え付ける作業を、上記ハブ本体８及び上記内輪９と外輪１とを、相対的に揺動若しくは回転させつつ行なう。
【００２３】
この為に、図示の例では、上記ハブ本体８を作業台２４の上面に支持した状態で、上記外輪１をこのハブ本体８に対し揺動させる様にしている。又、上記かしめ部１４は、上記円筒部１６の先端部に強く押し付けた、揺動プレス装置を構成する押型２６により形成する。この押型２６の先端面（図３の下端面）中央部には、上記円筒部１６の内側に押し込み自在な円錐台状の凸部２７を形成し、この凸部２７の周囲に断面円弧状の凹部２８を、この凸部２７の全周を囲む状態で形成している。この様な形状の凸部２７と凹部２８とを有する押型２６を上記円筒部１６の先端部に押し付ければ、この円筒部１６の先端部を直径方向外方にかしめ広げて、上記かしめ部１４を形成する事ができる。
【００２４】
上述の様にしてかしめ部１４を形成する本例の場合、このかしめ部１４の形成時に、上記内輪９及び上記ハブ本体８に対し、上記外輪１を揺動させている為、各円すいころ１７、１７が各軌道５、６、１１、１２上を転動する。この為、グリース等の潤滑剤がこれら各円すいころ１７、１７の転動面と上記各軌道５、６、１１、１２との当接部に入り込み、これら各当接部に上記潤滑剤の膜を十分に形成して、これら各当接部に於ける潤滑状態を良好にする。又、上記各円すいころ１７、１７が上記各軌道５、６、１１、１２上を転動する事により、これら各円すいころ１７、１７に調心作用が働くので、これら各円すいころ１７、１７の中心軸が正規の自転軸に対して傾く事を防止できる。従って、上記かしめ部１４により上記内輪９の他端面を押圧する際に、上記各円すいころ１７、１７の転動面と上記各軌道５、６、１１、１２との当接部での、これら各円すいころ１７、１７の母線方向に亙る滑りを円滑にする。従って、本例の場合も、上記各円すいころ１７、１７を含んで構成する、第一列、第二列の各円すいころ軸受３、４の内部隙間を所望の値とし、必要に応じ予圧を付与して、これら各円すいころ軸受３、４を含む車輪支持用転がり軸受ユニットに、所期の性能を発揮させる事ができる。
【００２５】
尚、上述した各例では、ハブ本体８及び内輪９と外輪１とを相対的に揺動若しくは回転させる作業を、この内輪９を段部１３に圧入する際にのみ（第１例の場合）、或はかしめ部１４を形成する際にのみ（第２例の場合）行なう場合に就いて説明した。但し、本発明は、上記ハブ本体８及び内輪９と上記外輪１とを相対的に揺動若しくは回転させる作業を、上記内輪９を上記段部１３に圧入する際と、上記かしめ部１４を形成する際との双方で行なっても良い。又、上述した各例では、車輪支持用転がり軸受ユニットを構成する各転動体が、円すいころ１７、１７である場合に就いて述べたが、本発明は、これら各転動体が玉である場合にも同様に適用でき、ほぼ同様の作用・効果を得られる。
【００２６】
【発明の効果】
上述の様に本発明の車輪支持用転がり軸受ユニットの組立方法によれば、この車輪支持用転がり軸受ユニットを構成する複列の転がり軸受の内部隙間を適正にできる。この為、車輪支持用転がり軸受ユニットに、所期の性能を発揮させる事ができる。
【図面の簡単な説明】
【図１】
本発明の組立方法を適用する車輪支持用転がり軸受ユニットの１例を示す断面図。
【図２】
本発明の実施の形態の第１例を示す断面図。
【図３】
同第２例を示す断面図。
【符号の説明】
１ 外輪
２ ハブ
３ 第一列の円すいころ軸受
４ 第二列の円すいころ軸受
５ 第一の外輪軌道
６ 第二の外輪軌道
７ 取付部
８ ハブ本体
９ 内輪
１０ フランジ
１１ 第一の内輪軌道
１２ 第二の内輪軌道
１３ 段部
１４ かしめ部
１５ 段差面
１６ 円筒部
１７ 円すいころ
１８ 第一の保持器
１９ 第二の保持器
２０ シールリング
２１ 空間
２２ 芯金
２３ 弾性材
２４ 作業台
２５ 圧入治具
２６ 押型
２７ 凸部
２８ 凹部
[Document name] Statement
Description: Assembling Method of Rolling Bearing Unit for Wheel Support
[Claims]
1. An outer diameter side raceway ring member having first and second outer ring raceways formed on an inner peripheral surface, an inner diameter side raceway ring member having first and second inner ring raceways formed on an outer peripheral surface, and the like. A plurality of rolling elements are provided between the first and second inner ring raceways and the first and second outer ring raceways so as to be rolling freely, and the inner diameter side raceway ring member is provided on the outer peripheral surface thereof. It is composed of a shaft member having the first inner ring track formed directly or via another inner ring, and an inner ring having the second inner ring track formed on the outer peripheral surface thereof, and the inner ring is attached to an end portion of the shaft member. The axial end face is suppressed by the caulking portion formed by externally fitting and further plastically deforming the cylindrical portion formed at the end portion of the shaft member in the radial direction, thereby supporting and fixing the shaft member. When assembling the rolling bearing unit for wheel support, first, while arranging the outer diameter side raceway ring member around the shaft member, between the first inner ring raceway and the first outer ring raceway. The plurality of rolling elements are installed in the above, then the inner ring is installed at the end of the shaft member, and the plurality of rolling elements are installed between the second inner ring track and the second outer ring track. A method for assembling a rolling bearing unit for wheel support, in which the cylindrical portion is plastically deformed outward in the radial direction to form the crimped portion, and the crimped portion suppresses the axial end surface of the inner ring. The inner ring is fitted onto the end of the shaft member.WorkA method for assembling a rolling bearing unit for wheel support, which comprises relatively rotating or swinging the inner diameter side raceway ring member and the outer diameter side raceway ring member.
2. Outer diameter side raceway ring members having first and second outer ring raceways formed on the inner peripheral surface, inner diameter side raceway ring members having first and second inner ring raceways formed on the outer peripheral surface, and these first and second A plurality of rolling elements are provided between the inner ring raceway and the first and second outer ring raceways so as to be rolling freely, and the inner diameter side raceway ring member is directly on the outer peripheral surface thereof or another inner ring. It is composed of a shaft member forming the first inner ring track and an inner ring forming the second inner ring track on the outer peripheral surface thereof, and the inner ring is fitted onto the end of the shaft member and further. A wheel support that is supported and fixed to the shaft member by suppressing the axial end face by a caulking portion formed by plastically deforming a cylindrical portion formed at the end of the shaft member in the radial direction. When assembling the rolling bearing unit, first, while arranging the outer diameter side raceway member around the shaft member, the plurality of roll bearing units are located between the first inner ring raceway and the first outer ring raceway. A rolling element is installed, and then the inner ring is installed at the end of the shaft member, and the plurality of rolling elements are externally fitted while being installed between the second inner ring track and the second outer ring track. Next, in the method of assembling the rolling bearing unit for wheel support, in which the cylindrical portion is plastically deformed outward in the radial direction to form the caulking portion and the caulking portion suppresses the axial end surface of the inner ring, the caulking portion is performed. The work of suppressing the axial end surface of the inner ring by the portion is performed by rotating or swinging the outer diameter side raceway ring member so that the outer diameter side raceway ring member and the inner diameter side raceway ring member are relatively rotated. Alternatively, a method of assembling a rolling bearing unit for wheel support, which is characterized by swinging.
Description: TECHNICAL FIELD [Detailed description of the invention]
[0001]
[Technical field to which the invention belongs]
The present invention relates to an improvement in an assembly method of a rolling bearing unit for wheel support for rotatably supporting a wheel of an automobile with respect to a suspension device.
0002.
[Conventional technology]
A rolling bearing unit for wheel support is used to rotatably support the wheels of an automobile with respect to the suspension system. An example of the structure of such a rolling bearing unit for wheel support will be described with reference to the structure of FIG. 1 used in the description of the first example of the embodiment of the present invention described later. In the rolling bearing unit for wheel support shown in FIG. 1, a hub 2 which is an inner diameter side race ring member is provided on the inner diameter side of the outer ring 1 which is an outer diameter side race wheel member by using double-row tapered roller bearings 3 and 4. It supports rotatably. Of these, the outer ring 1 is for forming the first row of tapered roller bearings 3 at one end of the inner peripheral surface (the end that is the outer end in the width direction of the vehicle when assembled to the automobile, and the left end in FIG. 1). The first tapered outer ring track 5 having a conical concave surface is also placed on the other end (the end that is on the center side in the width direction of the vehicle when assembled to the automobile, and the right end in FIG. 1), and the tapered rollers in the second row. A tapered concave second outer ring track 6 for forming the bearing 4 is formed, and a mounting portion 7 for supporting and fixing to the suspension device is provided on the outer peripheral surface thereof.
0003
Further, the hub 2 is formed by combining a hub body 8 which is a shaft member and an inner ring 9. Of these, the hub body 8 is a conical convex first one for forming a flange 10 for supporting a wheel at one end of an outer peripheral surface and a tapered roller bearing 3 in the first row in the middle portion. The inner ring track 11 is also formed with a step portion 13 having a diameter smaller than that of the portion where the first inner ring track 11 is formed at the other end. The first inner ring track 11 may be formed on the outer peripheral surface of another inner ring that is outerly fitted to the intermediate portion of the hub body 8. Further, the inner ring 9 has a conical convex second inner ring track 12 on the outer peripheral surface for forming the tapered roller bearing 4 in the second row. Such an inner ring 9 is press-fitted and fitted into the step portion 13 and is pressed toward the stepped surface 15 of the step portion 13 by a caulking portion 14 provided at the other end of the hub body 8. Such a crimped portion 14 is a cylinder formed at the other end of the hub body 8 so as to protrude in the axial direction from the other end surface of the inner ring 9 which is press-fitted (tightly fitted) to at least the stepped portion 13. The portion 16 is formed by plastically deforming outward in the radial direction by rocking press working or the like.
0004
Further, between the first and second outer ring orbits 5 and 6 and the first and second inner ring orbits 11 and 12, a plurality of tapered rollers 17 and 17, each of which is a rolling element, are provided. It is provided in a state where it is rotatably held by the first and second cages 18 and 19, respectively. As a result, both tapered roller bearings 3 and 4 in the first row and the second row are configured. In the case of a rolling bearing unit for supporting wheels for a heavy vehicle such as a truck, the tapered rollers 17 and 17 as described above are used as the rolling elements, but for a relatively light vehicle such as a passenger car. In the case of a rolling bearing unit for supporting wheels, a ball is often used as the rolling element. Further, in the illustrated example, the seal ring 20 supported on one end of the outer ring 1 seals the opening at one end of the space 21 in which the plurality of tapered rollers 17 and 17 are provided. Although not shown, the other end opening of the space 21 is also sealed by another seal ring or by a cover attached to the other end of the outer ring 1. As a result, the lubricant such as grease sealed in the space 21 is prevented from leaking to the outside, and foreign matter such as muddy water is prevented from entering the space 21 from the outside.
0005
When assembling the rolling bearing unit for wheel support configured as described above, first, the outer ring 1 is arranged around the hub body 8, and the first inner ring track 11 and the first outer ring track 5 are arranged. The plurality of tapered rollers 17 and 17 are provided between the two and the first cage 18 in a state of being held by the first cage 18. At the same time, the seal ring 20 is attached in a state of closing one end opening of the cylindrical space 21. The order of assembly work up to this point is slightly different depending on the structure of the rolling bearing unit for wheel support.
0006
For example, in the case of the rolling bearing unit for wheel support shown in FIG. 1, first, the plurality of tapered rollers 17 and 17 are held around the first inner ring track 11 by the first cage 18. Place it in the same state. In this state, a lubricant such as grease is applied to the first inner ring track 11 and the rolling surfaces of the tapered rollers 17 and 17. Further, the seal ring 20 is externally fitted and fixed to one end of the outer ring 1. In the case of the illustrated example, the seal ring 20 is formed in the same ring shape as the core metal 22 having an L-shaped cross section and formed in an annular shape as a whole, and is baked, adhered, or the like to the inner diameter side portion of the core metal 22. It is composed of a fixed elastic material 23. A core metal 22 of these is externally fitted and fixed to one end of the outer ring 1.
0007
Next, the hub body 8 is inserted into the outer ring 1 to which the seal ring 20 is fitted and fixed in this way from the other end side, and the outer ring 1 is arranged around the hub body 8. By this insertion work, the first outer ring track 5 comes into contact with the rolling surfaces of the plurality of tapered rollers 17 and 17 held by the first cage 18. Prior to performing the insertion work of the outer ring 1, a lubricant such as grease is also applied to the first outer ring track 5. Further, as the outer ring 1 is arranged around the hub body 8 as described above, the tip edges of a plurality of seal lips provided on the elastic material 23 constituting the seal ring 20 are formed at one end of the hub body 8. It contacts the outer peripheral surface of the approaching portion and the side surface of the base end portion of the flange 10 (sliding contact during operation), and seals one end opening of the cylindrical space 21.
0008
In the case of the structure shown in FIG. 1, the inner diameter of the elastic material 23 constituting the inner diameter side portion of the seal ring 20 is held by the outer diameter of the first cage 18 and the first cage 18. The diameter of the plurality of tapered rollers 17 and 17 is larger than the diameter of the circumscribed circle. Therefore, when the hub body 8 is inserted inside the outer ring 1 from the other end side as described above, the inner diameter side of the seal ring 20 that is externally fitted and fixed to one end of the outer ring 1 is the first. A plurality of tapered rollers 17 and 17 held by one cage 18 and the first cage 18 can be passed through. Therefore, in the case of the structure shown in FIG. 1, the work of attaching the seal ring 20 to the outer ring 1 is performed prior to the work of inserting the hub body 8 inside the outer ring 1.
0009
By mounting the seal ring 20 on the outer ring 1 in advance in this way, the inner diameter of the elastic material 23 (excluding the core metal 22) among the members constituting the seal ring 20 can be changed to the first diameter. The diameter of the circumscribed circles of the plurality of cone rollers 17 and 17 held by the one cage 18 (when the outer diameter of the first cage 18 is larger than the diameter of the circumscribed circle, this first It can be realized even if it is made slightly smaller than the outer diameter of the cage 18). That is, in this case, the elastic material23The seal is formed by elastically deforming the inner diameter side portion of the tapered rollers 17 and 17 (or the first cage 18) held by the first cage 18 along the outer diameter surface of the tapered rollers 17 and 17 (or the first cage 18). Allows the first cage 18 and the plurality of tapered rollers 17 and 17 held by the first cage 18 to pass through the inner diameter side of the ring 20.
0010
A plurality of tapered rollers held by the first cage 18 between the first inner ring track 11 and the first outer ring track 5 while the outer ring 1 is arranged around the hub body 8 as described above. After the rollers 17 and 17 are provided and the opening at one end of the space 21 is closed by the seal ring 20, the inner ring 9 is then fitted onto the other end of the hub body 8. Prior to this outer fitting work, a plurality of tapered rollers 17 and 17 are installed around the second inner ring track 12 formed on the outer peripheral surface of the inner ring 9 in a state of being held by the second cage 19. Keep it. In this state, a lubricant such as grease is applied to the second inner ring track 12 and the rolling surfaces of the tapered rollers 17 and 17. Then, in this state, the inner ring 9 is fitted onto the step portion 13 formed at the other end of the hub body 8 by tightening. Then, along with this outer fitting work, the rolling surfaces of the plurality of tapered rollers 17 and 17 held by the second cage 19 are formed on the inner peripheral surface of the outer ring 1 near the other end. It is brought into contact with the outer ring track 6. Prior to the outer fitting work, a lubricant such as grease is also applied to the second outer ring track 6. Next, the cylindrical portion 16 formed at the other end of the hub body 8 is plastically deformed outward in the radial direction by rocking press working or the like to form the crimped portion 14. Then, the inner ring 9 is fixed to the hub body 8 by pressing the other end surface of the inner ring 9 in the axial direction by the caulking portion 14.
0011
Then, based on pressing the other end surface of the inner ring 9 with the caulking portion 14 formed as described above and pressing one end surface of the inner ring 9 against the stepped surface 15, the (positive or negative) of the rolling bearing unit Set the internal gap to the desired value. In this way, when the inner ring 9 is fitted onto the step portion 13 of the hub body 8 and the caulking portion 14 is further formed, a plurality of tapered rollers held by the second cage 19 are formed. Contact portions between the rolling surfaces of 17 and 17 and the second outer ring track 6 and the second inner ring track 12, and a plurality of tapered rollers 17 and 17 held by the first cage 18. At the contact portion between the rolling surface and the first outer ring track 5 and the first inner ring track 11, slippage occurs along the bus lines of the tapered rollers 17 and 17, respectively.
0012
[Problems to be Solved by the Invention]
In the case of the conventional method of assembling the rolling bearing unit for wheel support as described above, the following inconveniences may occur. That is, when the inner ring 9 is fitted onto the step portion 13 as described above, the rolling surfaces of the plurality of tapered rollers 17 and 17 held by the first and second cages 18 and 19 and the rolling surfaces thereof. The surfaces of the orbits 5, 6, 11 and 12 that come into contact with each other rub against each other in the generatrix direction of each surface. For this reason, the lubricant such as grease described above is retracted from the contact portions between the respective surfaces, and the respective contact portions are in a state close to metal contact, and the friction coefficient of each of these contact portions becomes large. Therefore, when the inner ring 9 is fitted onto the step portion 13 or the end surface of the inner ring 9 is pressed by the caulking portion 14, smooth sliding is not performed at each of the contact portions, and the wheel is supported. The value of the internal clearance of the rolling bearing unit does not meet the desired value. For example, even if this internal gap should be negative, it may remain as a positive internal gap, and it may not be possible to apply a desired preload to the tapered roller bearings 3 and 4 in each row.
0013
In particular, when a plurality of rolling elements are tapered rollers 17 and 17, as in the rolling bearing unit for wheel support shown in FIG. 1, the central axes of the tapered rollers 17 and 17 become regular rotation axes. On the other hand, when tilting skew occurs, the above-mentioned problems become remarkable. In any case, if the internal gap of the rolling bearing unit for wheels deviates from the desired value, the rolling bearing unit for wheels cannot exhibit the desired performance, which is not preferable.
In view of the above circumstances, the assembly method of the present invention has been invented so that the internal gap of the rolling bearing unit for wheel support can be set to an appropriate value.
0014.
[Means for solving problems]
The wheel support rolling bearing unit assembled by the method of assembling the wheel support rolling bearing unit of the present invention has the first and second outer ring raceways on the inner peripheral surface, similarly to the conventionally known wheel support rolling bearing units. The outer diameter side race wheel member forming the above, the inner diameter side race wheel member having the first and second inner ring races formed on the outer peripheral surface, the first and second inner ring races, and the first and second outer rings. A plurality of rolling elements are provided between the track and the track so that they can roll freely. The inner ring side raceway member includes a shaft member having the first inner ring raceway formed directly on the outer peripheral surface thereof or via another inner ring, and an inner ring having the second inner ring raceway formed on the outer peripheral surface thereof. Consists of. Further, the inner ring is press-fitted and fitted into the end portion of the shaft member, and the axial end surface thereof is formed by a caulking portion formed by plastically deforming a cylindrical portion formed at the end portion of the shaft member in the radial direction. Is supported and fixed to the shaft member by being suppressed.
0015.
When assembling such a rolling bearing unit for wheel support, first, while arranging the outer diameter side raceway ring member around the shaft member, between the first inner ring raceway and the first outer ring raceway. The above-mentioned plurality of rolling elements are provided in the vehicle. Next, the inner ring is fitted at the end of the shaft member, and a plurality of rolling elements are fitted between the second inner ring track and the second outer ring track. Finally, the cylindrical portion is plastically deformed outward in the radial direction to form the crimped portion, and the crimped portion suppresses the axial end surface of the inner ring.
0016.
In particular, the present inventionOf the above in claim 1.In the method of assembling the rolling bearing unit for wheel support, the inner ring is fitted onto the end of the shaft member.Work, The inner diameter side raceway ring member and the outer diameter side raceway ring member are relatively rotated or swung.
Further, in the method of assembling the rolling bearing unit for wheel support according to claim 2, the work of pressing the axial end surface of the inner ring by the caulking portion is performed to rotate or swing the outer diameter side raceway ring member. By doing so, the outer diameter side raceway ring member and the inner diameter side raceway ring member are relatively rotated or swung.
[0017]
[Action]
According to the method for assembling the wheel support rolling bearing unit of the present invention as described above, the assembly work can be performed while setting the internal gap of the wheel support rolling bearing unit to a desired value, and the wheel support rolling bearing unit can be used. It is possible to demonstrate the performance of the period.
0018
BEST MODE FOR CARRYING OUT THE INVENTION
1 and 2 showCorresponding to claim 1,A first example of an embodiment of the present invention is shown. Since the structure of the rolling bearing unit for wheel support shown in FIG. 1 is as described above, the description of the structure of the rolling bearing unit for wheel support is omitted or simplified. The assembly method, which is a characteristic part of the above, will be explained. Prior to the assembly work described below, the rolling surfaces of the plurality of tapered rollers 17 and 17, as well as the first and second inner and outer ring tracks 11, 12, 5, and 6 are provided with grease or the like. Apply lubricant. First, while arranging the outer ring 1 around the hub main body 8, the first outer ring track 5 formed on the inner peripheral surface of the one end side portion (the left end side portion in FIG. 1 and the lower end side portion in FIG. 2) of the outer ring 1. A plurality of tapered rollers 17 and 17 held by the first cage 18 are assembled between the hub body 8 and the first inner ring track 11 formed on the outer peripheral surface of the intermediate portion of the hub body 8. At the same time, the seal ring 20 is attached in a state of closing one end opening of the space 21 in which the tapered rollers 17 and 17 are installed. The assembly method up to this point is the same as that of the conventional assembly method described above.
0019
Next, as in the case of the conventional assembly method described above, a plurality of tapered rollers 17 and 17 held by the second cage 19 are placed around the second inner ring track 12 formed on the outer peripheral surface of the inner ring 9. In the arranged state, the inner ring 9 is tightly fitted (press-fitted) to the stepped portion 13 formed on the outer peripheral surface of the other end portion (right end portion in FIG. 1 and upper end portion in FIG. 2) of the hub body 8. In particular, in the case of the assembly method of this example, the work of externally fitting the inner ring 9 to the step portion 13 causes the inner ring 9, the hub body 8 and the outer ring 1 to relatively swing (reciprocate) or rotate. Perform while rotating (rotating in one direction). Therefore, in the illustrated example, the outer ring 1 is swung (reciprocally rotated around the hub body 8) with respect to the hub body 8 while the hub body 8 is supported on the upper surface of the work table 24 or the like. I am doing it. While swinging the outer ring 1 in this way, one end surface of the inner ring 9 is an outer peripheral surface of the hub body 8 by a press-fitting jig 25 in which the inner ring 9 is abutted against the step portion 13 and the other end surface of the inner ring 9. It fits outside until it hits the stepped surface 15 formed on the surface.
0020
Then, in this way, the inner ring 9 is fitted onto the step portion 13 and the rolling surfaces of the plurality of tapered rollers 17 and 17 held by the second cage 19 are moved closer to the other end of the outer ring 1. It is brought into contact with the second outer ring track 6 formed on the inner peripheral surface of the portion. When the inner ring 9 is fitted onto the step portion 13 in this way, the rolling surfaces of the tapered rollers 17 and 17 and the surfaces of the orbits 6 and 12 are brought into contact with each other in the generatrix direction of each of the surfaces. Sliding over. However, in the case of this example, when the inner ring 9 is fitted onto the step portion 13 in this way, the outer ring 1 is swung with respect to the inner ring 9 and the hub body 8, so that each tapered roller 17 , 17 roll on each of the above orbits 6 and 12. Therefore, based on the rolling of the tapered rollers 17 and 17, a lubricant such as grease is applied to the contact portion between the rolling surfaces of the tapered rollers 17 and 17 and the orbits 6 and 12 thereof. It penetrates and a film of the lubricant is sufficiently formed on each of these contact portions. Therefore, the lubrication state at each of these contact portions is improved. In other words, in the case of this example, as in the conventional case described above, the lubricant is retracted from each of these contact portions, and the contact state of each of these contact portions becomes a state close to metal contact. Can be prevented. Further, since the tapered rollers 17 and 17 roll on the orbits 5, 6, 11 and 12, the centering action acts on the tapered rollers 17 and 17, so that the tapered rollers 17 and 17 are aligned. It is possible to prevent the central axis of the bearing from tilting with respect to the regular rotation axis.
0021.
As a result, next, the cylindrical portion 16 provided at the other end of the hub body 8 is plastically deformed outward in the radial direction by rocking press working or the like to form a crimped portion 14, and the crimped portion 14 forms the inner ring. If the other end surface of 9 is pressed (pressed), a wheel supporting rolling bearing unit having a desired internal gap can be obtained. Further, if the caulking portion 14 is formed, the rolling surfaces of the tapered rollers 17 and 17 and the contact portions of the orbits 5, 6, 11 and 12 are brought into contact with the tapered rollers 17 and 17. Even if slipping occurs in the direction of the busbar, the sliding friction force can be kept low. Therefore, the internal gaps of the tapered roller bearings 3 and 4 in the first row and the second row, which include the tapered rollers 17 and 17, can be set as desired values, and preload can be applied as needed. As a result, the rolling bearing unit for wheel support including these tapered roller bearings 3 and 4 can exhibit the desired performance.
0022.
Next, FIG. 3 showsCorresponding to claim 2,A second example of the embodiment of the present invention is shown. In the case of this example, the assembly work until the inner ring 9 is press-fitted and outer-fitted into the step portion 13 provided on the outer peripheral surface of the other end of the hub body 8 is the same as in the case of the conventional assembly method described above. In particular, in the case of this example, the cylindrical portion 16 provided at the other end of the hub body 8 is plastically deformed outward in the radial direction to form the crimped portion 14, and the crimped portion 14 forms the other end surface of the inner ring 9. The pressing work is performed while the hub main body 8 and the inner ring 9 and the outer ring 1 are relatively swung or rotated.
[0023]
Therefore, in the illustrated example, the outer ring 1 is swung with respect to the hub body 8 while the hub body 8 is supported on the upper surface of the work table 24. Further, the caulking portion 14 is formed by a pressing die 26 constituting a swing press device, which is strongly pressed against the tip end portion of the cylindrical portion 16. At the center of the tip surface (lower end surface of FIG. 3) of the stamp 26, a truncated cone-shaped convex portion 27 that can be pushed inside the cylindrical portion 16 is formed, and an arc-shaped cross section is formed around the convex portion 27. The concave portion 28 is formed so as to surround the entire circumference of the convex portion 27. When the stamp 26 having the convex portion 27 and the concave portion 28 having such a shape is pressed against the tip portion of the cylindrical portion 16, the tip portion of the cylindrical portion 16 is caulked outward in the radial direction, and the caulked portion 14 Can be formed.
0024
In the case of this example in which the crimped portion 14 is formed as described above, since the outer ring 1 is swung with respect to the inner ring 9 and the hub body 8 when the crimped portion 14 is formed, each tapered roller 17 , 17 roll on each of the orbits 5, 6, 11, and 12. Therefore, a lubricant such as grease enters the contact portion between the rolling surfaces of the tapered rollers 17 and 17 and the respective orbits 5, 6, 11 and 12, and a film of the lubricant is applied to each of these contact portions. Is sufficiently formed to improve the lubrication state at each of these contact portions. Further, since the tapered rollers 17 and 17 roll on the orbits 5, 6, 11 and 12, the centering action acts on the tapered rollers 17 and 17, so that the tapered rollers 17 and 17 are aligned. It is possible to prevent the central axis of the bearing from tilting with respect to the regular rotation axis. Therefore, when the other end surface of the inner ring 9 is pressed by the caulking portion 14, these are at the contact portions between the rolling surfaces of the tapered rollers 17 and 17 and the orbits 5, 6, 11 and 12. Smooth the sliding of tapered rollers 17 and 17 in the direction of the generatrix. Therefore, also in the case of this example, the internal gaps of the tapered roller bearings 3 and 4 in the first row and the second row, which are configured to include the tapered rollers 17 and 17, are set to desired values, and preload is applied as necessary. In addition, the rolling bearing unit for wheel support including these tapered roller bearings 3 and 4 can exhibit the desired performance.
0025
In each of the above-mentioned examples, the work of relatively swinging or rotating the hub body 8 and the inner ring 9 and the outer ring 1 is performed only when the inner ring 9 is press-fitted into the step portion 13 (in the case of the first example). Or only when forming the crimped portion 14 (Second exampleIn the case of) I explained how to do it. However, in the present invention, the work of relatively swinging or rotating the hub body 8 and the inner ring 9 and the outer ring 1 is performed when the inner ring 9 is press-fitted into the step portion 13 and the caulking portion 14 is formed. You may do it both when you do it. Further, in each of the above-described examples, the case where each rolling element constituting the wheel supporting rolling bearing unit is tapered rollers 17 and 17 has been described. However, the present invention describes the case where each of these rolling elements is a ball. It can be applied to the same, and almost the same action / effect can be obtained.
0026
【Effect of the invention】
As described above, according to the method for assembling the wheel support rolling bearing unit of the present invention, the internal gap of the double row rolling bearings constituting the wheel support rolling bearing unit can be made appropriate. Therefore, the rolling bearing unit for wheel support can exhibit the desired performance.
[Simple explanation of drawings]
FIG. 1
FIG. 5 is a cross-sectional view showing an example of a rolling bearing unit for wheel support to which the assembly method of the present invention is applied.
FIG. 2
FIG. 5 is a cross-sectional view showing a first example of the embodiment of the present invention.
FIG. 3
The second example is shown.Sectional view.
[Explanation of symbols]
1 outer ring
2 hub
3 Tapered roller bearings in the first row
4 Tapered roller bearings in the second row
5 First outer ring trajectory
6 Second outer ring orbit
7 Mounting part
8 Hub body
9 Inner ring
10 flange
11 First inner ring orbit
12 Second inner ring orbit
13 steps
14 caulking part
15 Step surface
16 Cylindrical part
17 Tapered Rollers
18 First cage
19 Second cage
20 Seal ring
21 space
22 core metal
23 Elastic material
24 workbench
25 Press-fit jig
26 stamping
27 Convex part
28Recess