JP4467482B2 - Wheel bearing device - Google Patents

Wheel bearing device Download PDF

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JP4467482B2
JP4467482B2 JP2005208186A JP2005208186A JP4467482B2 JP 4467482 B2 JP4467482 B2 JP 4467482B2 JP 2005208186 A JP2005208186 A JP 2005208186A JP 2005208186 A JP2005208186 A JP 2005208186A JP 4467482 B2 JP4467482 B2 JP 4467482B2
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inner ring
wheel
ring
hub
inboard side
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JP2007024204A (en
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啓 藤村
和則 久保田
浩司 松永
和雄 小森
哲也 橋本
政浩 木内
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NTN Corp
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NTN Corp
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Priority to JP2005208186A priority Critical patent/JP4467482B2/en
Priority to US11/444,343 priority patent/US7874734B2/en
Priority to EP06011320A priority patent/EP1729021B1/en
Priority to DE200660011816 priority patent/DE602006011816D1/en
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Description

この発明は、自動車等の駆動輪となる車輪を回転自在に支持する車輪用軸受装置に関する。   The present invention relates to a wheel bearing device that rotatably supports a wheel serving as a driving wheel of an automobile or the like.

従来、駆動輪支持用の車輪用軸受装置として、図５に示すものが提案されている（例えば特許文献１）。これは、外方部材２１と内方部材２２の対向する軌道面２３，２４間に複列にボール２５を介在させ、上記内方部材２２を、車輪取付用のハブフランジ２９ａを外周に有するハブ輪２９と、このハブ輪２９のインボード側端の外周に嵌合した内輪３０とで構成した形式のものである。ハブ輪２９の中央孔３１には、等速ジョイントの外輪３３のステム部３３ａが挿通されてスプライン嵌合され、等速ジョイント外輪３３の段面３３ｂが内輪３０のインボード側端面３０ａに押し当てられる。この状態で、前記ステム部３３ａの先端にナット３４を螺合させることにより、等速ジョイント外輪３３とナット３４とで内方部材２２が幅締めされる。   Conventionally, what is shown in FIG. 5 is proposed as a wheel bearing device for driving wheel support (for example, patent document 1). This is because a ball 25 is interposed in a double row between the raceway surfaces 23 and 24 of the outer member 21 and the inner member 22 facing each other, and the inner member 22 is a hub having a wheel mounting hub flange 29a on the outer periphery. This is a type constituted by a ring 29 and an inner ring 30 fitted to the outer periphery of the inboard side end of the hub ring 29. The stem portion 33a of the outer ring 33 of the constant velocity joint is inserted into the central hole 31 of the hub wheel 29 and is splined, and the step surface 33b of the constant velocity joint outer ring 33 is pressed against the inboard side end surface 30a of the inner ring 30. It is done. In this state, the inner member 22 is tightened by the constant velocity joint outer ring 33 and the nut 34 by screwing the nut 34 into the tip of the stem portion 33a.

この提案例では、ハブ輪２９のインボード側端部の外周に形成した段部３５に内輪３０を外嵌させると共に、内輪３０のインボード側端部の内周に段部３６を形成し、ハブ輪２９のインボード側端を前記内輪３０の段部３６に加締めている。
特開平９−１６４８０３号公報 In this proposed example, the inner ring 30 is externally fitted to the step 35 formed on the outer periphery of the end portion on the inboard side of the hub wheel 29, and the step portion 36 is formed on the inner periphery of the end portion on the inboard side of the inner ring 30. the inboard end of the hub 29 that are crimped to the stepped portion 36 of the inner ring 30.
JP-A-9-164803

しかし、上記した車輪用軸受装置では、以下のような問題が有る。
（１）ハブ輪２９の加締部２９ｂが大きいため、内輪３０のインボード側端部を形成する段部３６の径方向段差を、半径差で５〜７mm程度とする必要がある。このように段部３６の段差を大きくすると、内輪３０のインボード側端面３０ａの面積が小さくなるので、等速ジョイント外輪３３の段面３３ｂとの接触面圧が大きくなる。そのため、摩耗や異音の発生の原因となる。
（２）ハブ輪２９の加締部２９ｂを内輪３０のインボード側端より内側（アウトボード側）に収めようとすると、内輪３０の段部３６の軸方向長さを７〜８mm程度にする必要がある。このように内輪段部３６の軸方向長さが長くなると、ボール接触角を成す直線上に内輪段部３６が位置する傾向があり、そのため、運転時の負荷荷重による内輪変形が大きくなって短寿命となる可能性がある。また、内輪段部３６の軸方向長さが長くなると、それだけハブ輪２９に対する内輪３０の嵌め合い長さ（面積）が減少するので、内輪クリープが発生し、軸受寿命が低下する可能性がある。これらの問題は、内輪全体の幅寸法を長くすれば回避できるが、それでは軸方向に余分なスペースが必要になる。
（３）また、ハブ輪２９の加締部２９ｂが大きいことから、揺動加締加工において、加締工具が内輪３０と干渉し、加工が困難である。 However, the above-described wheel bearing device has the following problems.
(1) Since the caulking portion 29b of the hub wheel 29 is large, the radial step of the step portion 36 forming the inboard side end portion of the inner ring 30 needs to be about 5 to 7 mm in radius difference. When the step of the stepped portion 36 is increased in this way, the area of the inboard side end surface 30a of the inner ring 30 is reduced, so that the contact surface pressure with the stepped surface 33b of the constant velocity joint outer ring 33 is increased. Therefore, it causes wear and abnormal noise.
(2) When the caulking portion 29b of the hub ring 29 is to be stored inside (outboard side) from the inboard side end of the inner ring 30, the axial length of the step portion 36 of the inner ring 30 is set to about 7 to 8 mm. There is a need. When the axial length of the inner ring step portion 36 is increased in this way, the inner ring step portion 36 tends to be positioned on a straight line that forms the ball contact angle. Therefore, deformation of the inner ring due to a load load during operation becomes large and short. There is a possibility of end of life. Further, when the axial length of the inner ring step portion 36 is increased, the fitting length (area) of the inner ring 30 with respect to the hub ring 29 is reduced accordingly, so that inner ring creep occurs and the bearing life may be reduced. . These problems can be avoided by increasing the width of the entire inner ring, but this requires extra space in the axial direction.
(3) Further, since the caulking portion 29b of the hub wheel 29 is large, the caulking tool interferes with the inner ring 30 in the swing caulking process, and the machining is difficult.

この発明の目的は、軸受機能へ悪影響を及ぼすことなく、車両への組立工程における内輪抜けを防止でき、かつ工程の増加を削減できる車輪用軸受装置を提供することである。   An object of the present invention is to provide a wheel bearing device that can prevent an inner ring from being removed in an assembly process to a vehicle and can reduce an increase in the process without adversely affecting the bearing function.

この発明の車輪用軸受装置は、内周に複列の軌道面を有する外方部材と、これら軌道面に対向する軌道面を有する内方部材と、対向する軌道面間に介在した複列の転動体とを備え、上記内方部材が、車輪取付用のハブフランジを外周に有し中心に貫通孔を有するハブ輪と、このハブ輪のインボード側端の外周に嵌合した内輪とでなり、これらハブ輪および内輪に前記各列の軌道面を形成し、前記ハブ輪が等速ジョイントの外輪と結合されて前記内輪のインボード側に向く端面が前記等速ジョイントの外輪に設けられたアウトボード側に向く段面に押し付けられる駆動輪支持用の車輪用軸受装置において、次の構成としたことを特徴とする。
すなわち、前記内輪の内周面におけるインボード側端に、この内輪のインボード側の端面まで続き、この端面の内周縁に、車両への組立工程における内輪の抜けを防止し得る程度に小さな深さの段差部を設け、前記ハブ輪の加締加工により前記内輪の前記段差部に係合する塑性変形部分を設け、この塑性変形部分は前記内輪の端面から突出しないものとし、前記内輪は表面から芯部までの全体を焼入れ処理により硬化させたものとする。この内輪の前記段差部の内面における軸方向を向く面を、前記焼入れ処理よりも前に旋削された旋削仕上げ面とする。 The wheel bearing device of the present invention includes an outer member having a double-row raceway surface on the inner periphery, an inner member having a raceway surface facing these raceway surfaces, and a double-row interposed between the opposing raceway surfaces. A rolling element, and the inner member includes a hub wheel having a hub flange for wheel mounting on the outer periphery and a through hole in the center, and an inner ring fitted to the outer periphery of the inboard side end of the hub wheel. The hub ring and the inner ring are formed with raceways of the respective rows, and the hub ring is connected to the outer ring of the constant velocity joint, and the end surface facing the inboard side of the inner ring is provided on the outer ring of the constant velocity joint. in the bearing device for a wheel driving wheel supporting pressed against the stepped surface facing the outboard side, characterized in that the following configuration.
That is, the inner ring has an inboard side end on the inner peripheral surface that extends to the end surface on the inboard side of the inner ring, and the inner ring has a depth that is small enough to prevent the inner ring from coming off during the assembly process to the vehicle. And a plastic deformation portion that engages with the step portion of the inner ring by caulking processing of the hub ring, the plastic deformation portion does not protrude from an end surface of the inner ring, and the inner ring It is assumed that the whole from the core to the core is cured by quenching. A surface facing the axial direction on the inner surface of the step portion of the inner ring is a turning finished surface that is turned before the quenching treatment.

この構成によると、内輪の内周面に段差部を設け、ハブ輪の加締加工による塑性変形部分を前記段差部の軸方向に向く面に係合させたので、車両への組付工程において発生する外力による内輪のハブ輪からの抜けを防止できる。内輪の段差部は、内輪の内周縁というごく限られた範囲のものとしたため、内輪の抜け耐力を確保しながら、段差部をできるだけ小さなものとできる。このため、段差部を設けながら内輪端面の面積の減少を少なくできて、等速ジョイント外輪の段面との接触面圧の増加が抑制され、摩耗や異音の発生を防止できる。
内輪の前記段差部はできるだけ小さなものとし、また焼き入れ処理するが、内輪の前記段差部の内面における前記テーパ面を、焼入れ処理前に旋削された旋削仕上げ面とすることにより、必要な内輪抜け耐力を確保することができる。焼入れ処理前に旋削された旋削仕上げ面とするため、研削加工等の工程を追加する必要がない。
内輪は小部品であって軌道面を有し、かつハブ輪に内径面が嵌合することから、前記したように表面から芯部までの全体を焼入れ処理により硬化させたものとすることで、転動寿命に優れ、かつ嵌合面の耐摩耗性に優れたものとなる。
このように、この車輪用軸受装置では、軸受機能へ悪影響を及ぼすことなく、車両への組立工程における内輪抜けを防止できる。 According to this configuration, the step portion is provided on the inner peripheral surface of the inner ring, and the plastic deformation portion by the caulking process of the hub ring is engaged with the surface of the step portion that faces in the axial direction. It is possible to prevent the inner ring from coming off from the hub ring due to the generated external force. Since the step portion of the inner ring is in a very limited range of the inner periphery of the inner ring, the step portion can be made as small as possible while ensuring the slip-off resistance of the inner ring. For this reason, the decrease in the area of the inner ring end face can be reduced while providing the stepped portion, the increase of the contact surface pressure with the stepped surface of the constant velocity joint outer ring is suppressed, and the occurrence of wear and noise can be prevented.
The step portion of the inner ring is a possible small, also will be treated quenching, the tapered surface on the inner surface of the inner ring of the stepped portion, by the turning has been turned surface finish prior to quenching treatment, omission inner ring required Yield strength can be secured. Since the surface is turned before the quenching process, there is no need to add a process such as grinding.
Since the inner ring is a small part and has a raceway surface, and the inner diameter surface is fitted to the hub ring, as described above, the whole from the surface to the core is hardened by quenching, Excellent rolling life and excellent wear resistance of the mating surface.
Thus, in this wheel bearing device, it is possible to prevent the inner ring from being lost in the assembly process to the vehicle without adversely affecting the bearing function.

前記内輪の段差部の内面は、円筒面からなるストレート部と、このストレート部の端部から内輪の内周面に続くテーパ面とでなる形状とする。このテーパ面が前記段差部の内面における前記軸方向を向く面である。
内輪の段差部の内面をストレート部とテーパ面とでなる形状とした場合、ハブ輪の塑性変形部分が加締加工されるときに、隙間なく接触するように塑性変形し、段差部との係合の信頼性が優れたものとなる。そのため、塑性変形部分の加締加工が容易である。 The inner surface of the inner ring of the stepped portion is a straight portion formed of a cylindrical surface, a shape formed of a tapered surface continuing from the end of the straight portion on the inner peripheral surface of the inner ring. This tapered surface is a surface facing the axial direction on the inner surface of the stepped portion .
When the inner surface of the step part of the inner ring is made of a straight part and a tapered surface, when the plastic deformation part of the hub ring is crimped, it is plastically deformed so that there is no gap between it and the relationship with the step part. The reliability of the combination is excellent. Therefore, the caulking process of the plastically deformed portion is easy.

この発明において、前記ハブ輪の軌道面は焼入れ処理した表面硬化処理面としても良い。ハブ輪における軌道面を焼入れ処理した表面硬化処理面とすることで、転動寿命を確保できる。   In the present invention, the raceway surface of the hub wheel may be a hardened surface hardened surface. A rolling life can be secured by making the raceway surface of the hub wheel a hardened surface.

この発明において、前記ハブ輪の前記貫通孔は、前記等速自在継手のステム部の外周のスプラインと噛み合うスプライン溝を内周面に有し、前記貫通孔の内周面における前記スプライン溝が形成された一般径部分よりもインボード側の部分を、前記塑性変形部分の内周面となる大径段差部と、この大径段差部よりも小径で前記一般径部分よりも大径となる中間径段差部とでなる２段の段付き形状としても良い。この構成の場合、中間径段差部が、等速自在継手のステム部を挿入するときの案内となり、組立性がより向上する。   In the present invention, the through hole of the hub wheel has a spline groove on the inner peripheral surface that meshes with a spline on the outer periphery of the stem portion of the constant velocity universal joint, and the spline groove on the inner peripheral surface of the through hole is formed. The portion on the inboard side of the general diameter portion formed is divided into a large-diameter step portion that becomes an inner peripheral surface of the plastic deformation portion, and an intermediate portion that is smaller in diameter than the large-diameter step portion and larger in diameter than the general-diameter portion. It is good also as a 2 stepped shape which consists of a diameter step part. In the case of this configuration, the intermediate diameter step portion serves as a guide when inserting the stem portion of the constant velocity universal joint, and the assemblability is further improved.

この発明の車輪用軸受装置は、内周に複列の軌道面を有する外方部材と、これら軌道面に対向する軌道面を有する内方部材と、対向する軌道面間に介在した複列の転動体とを備え、上記内方部材が、車輪取付用のハブフランジを外周に有し中心に貫通孔を有するハブ輪と、このハブ輪のインボード側端の外周に嵌合した内輪とでなり、これらハブ輪および内輪に前記各列の軌道面を形成し、前記ハブ輪が等速ジョイントの外輪と結合されて前記内輪のインボード側に向く端面が前記等速ジョイントの外輪に設けられたアウトボード側に向く段面に押し付けられる駆動輪支持用の車輪用軸受装置において、前記内輪の内周面におけるインボード側端に、この内輪のインボード側の端面まで続き、この端面の内周縁に、車両への組立工程における内輪の抜けを防止し得る程度に小さな深さの段差部を設け、この段差部の内面を、円筒面からなるストレート部と、このストレート部の端部から内輪の内周面に続くテーパ面とでなる形状とし、前記ハブ輪の加締加工により前記内輪の前記段差部の前記テーパ面に係合する塑性変形部分を設け、この塑性変形部分は前記内輪の端面から突出しないものとし、前記内輪は表面から芯部までの全体を焼入れ処理により硬化させたものとし、この内輪の前記段差部の内面における前記テーパ面を、前記焼入れ処理前に旋削された旋削仕上げ面としたため、軸受機能へ悪影響を及ぼすことなく、車両への組立工程における内輪抜けを防止できる。特に、内輪の段差部におけるテーパ面を、焼入れ処理前に旋削された旋削仕上げ面としたため、研削加工等の工程を追加することなく、必要な内輪抜け耐力を確保することができる。
The wheel bearing device of the present invention includes an outer member having a double-row raceway surface on the inner periphery, an inner member having a raceway surface facing these raceway surfaces, and a double-row interposed between the opposing raceway surfaces. A rolling element, and the inner member includes a hub wheel having a hub flange for wheel mounting on the outer periphery and a through hole in the center, and an inner ring fitted to the outer periphery of the inboard side end of the hub wheel. The hub ring and the inner ring are formed with raceways of the respective rows, and the hub ring is connected to the outer ring of the constant velocity joint, and the end surface facing the inboard side of the inner ring is provided on the outer ring of the constant velocity joint. and the bearing device for a wheel driving wheel supporting pressed against the stepped surface facing the outboard side, the inboard end of definitive an inner circumferential surface of the inner ring, continues to the end face of the inner ring of the inboard side of the end face the inner peripheral edge, in the assembly process of the vehicle The stepped portion of the small depth extent capable of preventing the loss of the ring is provided, the inner surface of the stepped portion, and a straight portion formed of a cylindrical surface, the tapered surface continuing from the end of the straight portion on the inner peripheral surface of the inner ring and made a shape, the said plastic deformation portion which engages the tapered surface of the stepped portion of the inner ring by caulking of the wheel hub is provided, the plastic deformation portion shall not protrude from the end face of the inner ring, the inner ring The entire surface from the core to the core is hardened by quenching, and the tapered surface on the inner surface of the stepped portion of the inner ring is turned to a finished surface that has been turned before the quenching. The inner ring can be prevented from coming off during the assembly process to the vehicle. In particular, since the tapered surface in the step portion of the inner ring is a turning finished surface that is turned before quenching, the necessary inner ring slip-off resistance can be ensured without adding a process such as grinding.

この発明の一実施形態を図１ないし図３と共に説明する。この実施形態は、第３世代型の内輪回転タイプで、かつ駆動輪支持用の車輪用軸受装置に適用したものである。なお、この明細書において、車両に取付けた状態で車両の車幅方向外側寄りとなる側をアウトボード側と言い、車両の中央寄りとなる側をインボード側と呼ぶ。
この車輪用軸受装置は、内周に複列の軌道面３を形成した外方部材１と、これら各軌道面３に対向する軌道面４を形成した内方部材２と、これら外方部材１および内方部材２の軌道面３，４間に介在した複列の転動体５とで構成される。この車輪用軸受装置は、複列のアンギュラ玉軸受型とされていて、転動体５はボールからなり、各列毎に保持器６で保持されている。上記各軌道面３，４は断面円弧状であり、各軌道面３，４はボール接触角θが背面合わせとなるように形成されている。外方部材１と内方部材２との間の軸受空間の両端は、シール７，８によりそれぞれ密封されている。 An embodiment of the present invention will be described with reference to FIGS. This embodiment is a third generation type inner ring rotation type and is applied to a wheel bearing device for driving wheel support. In this specification, the side closer to the outer side in the vehicle width direction of the vehicle when attached to the vehicle is referred to as the outboard side, and the side closer to the center of the vehicle is referred to as the inboard side.
The wheel bearing device includes an outer member 1 having a double-row raceway surface 3 formed on the inner periphery, an inner member 2 having a raceway surface 4 opposed to each raceway surface 3, and these outer members 1. And the double row rolling elements 5 interposed between the raceway surfaces 3 and 4 of the inner member 2. This wheel bearing device is a double-row angular ball bearing type, and the rolling elements 5 are formed of balls, and are held by a cage 6 for each row. Each of the track surfaces 3 and 4 has an arc shape in cross section, and each of the track surfaces 3 and 4 is formed so that the ball contact angle θ is aligned with the back surface. Both ends of the bearing space between the outer member 1 and the inner member 2 are sealed by seals 7 and 8, respectively.

外方部材１は固定側の部材となるものであって、車体の懸架装置（図示せず）におけるナックルに取付けるフランジ１ａを外周に有し、全体が一体の部品とされている。
内方部材２は回転側の部材となるものであって、外周に車輪取付用のハブフランジ９ａを有するハブ輪９と、このハブ輪９の軸部９ｂのインボード側端の外周に嵌合した内輪１０とでなる。これらハブ輪９および内輪１０に前記各列の軌道面４が形成されている。ハブ輪９は中心に貫通孔１１を有し、その軌道面４は、焼入れ処理による表面硬化処理面とされている。また、内輪１０は、表面から芯部までの全体が焼入れ処理により硬化させてある。 The outer member 1 is a member on the fixed side, and has a flange 1a attached to the knuckle in the suspension device (not shown) of the vehicle body on the outer periphery, and the whole is an integral part.
The inner member 2 is a rotating member, and is fitted to the outer periphery of the hub wheel 9 having a hub flange 9a for wheel mounting on the outer periphery and the inboard side end of the shaft portion 9b of the hub wheel 9. The inner ring 10 made. The hub ring 9 and the inner ring 10 are formed with the raceway surfaces 4 in each row. The hub wheel 9 has a through hole 11 in the center, and the raceway surface 4 is a surface-hardened surface by quenching. Further, the inner ring 10 is hardened entirely by quenching from the surface to the core.

図２および図３に拡大断面図で示すように、ハブ輪９のインボード側端の外周には、ハブ輪９の他の部分の外周よりも小径となった段差部状の内輪嵌合面部１５が形成され、この内輪嵌合面部１５に内輪１０が嵌合する。内輪１０の内周面におけるインボード側端には、この内輪１０のインボード側の端面１０ａまで続き、この端面１０ａの内周縁に相当する深さの段差部１６が設けられる。この段差部１６は、内輪１０の軌道面４の接触角θを成す直線Ｌ（図１）よりもインボード側に位置している。段差部１６の内面は、円筒面からなるストレート部１６ａと、このストレート部１６ａの端部から内輪１０の内周面に続くテーパ面１６ｂとでなる形状とされている。このテーパ面１６ｂは、前記焼入れ処理よりも前に旋削された旋削仕上げ面とされている。   As shown in enlarged sectional views in FIGS. 2 and 3, a stepped inner ring fitting surface portion having a smaller diameter than the outer periphery of the other portion of the hub wheel 9 is provided on the outer periphery of the inboard side end of the hub wheel 9. 15 is formed, and the inner ring 10 is fitted to the inner ring fitting surface portion 15. A stepped portion 16 having a depth corresponding to the inner peripheral edge of the end surface 10a is provided at the inboard side end of the inner ring 10 up to the end surface 10a on the inboard side of the inner ring 10. The step portion 16 is located on the inboard side with respect to the straight line L (FIG. 1) that forms the contact angle θ of the raceway surface 4 of the inner ring 10. The inner surface of the stepped portion 16 has a shape including a straight portion 16a formed of a cylindrical surface and a tapered surface 16b extending from the end portion of the straight portion 16a to the inner peripheral surface of the inner ring 10. The tapered surface 16b is a turning finished surface that is turned before the quenching process.

ハブ輪９のインボード側端には、内輪１０の段差部１６の内面における軸方向を向く面である上記テーパ面１６ｂに加締加工により係合する塑性変形部分９ｃを設けてある。なお、図２は塑性変形部分９ｃの加締加工前の状態を、図３は加締加工後の状態をそれぞれ示す。塑性変形部分９ｃは、内輪１０の段差部１６内をほぼ充足するが、内輪１０の端面１０ａから突出しないものとしてある。上記加締加工は、プレス加工等の方法で全周に渡り行われる。この加締加工は、ハブ輪９のインボード側端の全周を拡径させる拡径加締めによって行われる。ハブ輪９の加締加工を行う塑性変形部分９ｃは非熱処理部とされている。   At the inboard side end of the hub wheel 9, there is provided a plastic deformation portion 9c that engages the taper surface 16b, which is an axially facing surface of the inner surface of the step portion 16 of the inner ring 10, by caulking. 2 shows a state before the caulking process of the plastic deformation portion 9c, and FIG. 3 shows a state after the caulking process. The plastic deformation portion 9c substantially fills the inside of the step portion 16 of the inner ring 10, but does not protrude from the end face 10a of the inner ring 10. The caulking process is performed over the entire circumference by a method such as press working. This caulking process is performed by expanding caulking that expands the entire circumference of the inboard side end of the hub wheel 9. The plastically deformed portion 9c that performs the caulking process of the hub wheel 9 is a non-heat treated portion.

ハブ輪９の貫通孔１１の内周面は、スプライン溝１１ａａの形成された一般径部分１１ａを有する。また、この一般径部分１１ａよりもインボード側の部分は、上記塑性変形部分９ｃの内周面となる大径段差部１１ｂと、この大径段差部１１ｂよりも小径で前記一般径部分１１ａよりも大径となる中間径段差部１１ｃとでなる２段の段付き形状とされている。   The inner peripheral surface of the through hole 11 of the hub wheel 9 has a general diameter portion 11a in which a spline groove 11aa is formed. Further, the portion on the inboard side with respect to the general diameter portion 11a has a large diameter step portion 11b which is an inner peripheral surface of the plastic deformation portion 9c, and a diameter smaller than the large diameter step portion 11b than the general diameter portion 11a. Also, it has a two-step stepped shape formed by an intermediate diameter step portion 11c having a large diameter.

なお、この発明の車輪用軸受装置は、例えば小型乗用車から大型乗用車にわたる一般的な乗用車に適用されるものであり、これら一般的な乗用車に適用される各部の寸法のものとされている。   The wheel bearing device of the present invention is applied to, for example, a general passenger car ranging from a small passenger car to a large passenger car, and has a size of each part applied to these general passenger cars.

この車輪用軸受装置の車両への組付けにおいては、等速ジョイント１２の片方の継手部材となる外輪１３のステム部１３ａをハブ輪９の貫通孔１１に挿通させ、ステム部１３ａの外周のスプライン１３ａａ（図１）と貫通孔１１の内周面のスプライン溝１１ａａとをスプライン嵌合させ、ステム部１３ａの先端に螺合するナット１４の締め付けにより、等速ジョイント外輪１３を内方部材２に結合する。このとき、等速ジョイント外輪１３に設けられたアウトボード側に向く段面１３ｂが、内輪１０のインボード側に向く端面１０ａに押し付けられ、等速ジョイント外輪１３とナット１４とで内方部材２が幅締めされる。 車輪取付用のハブフランジ９ａはハブ輪９のアウトボード側端に位置しており、このハブフランジ９ａにブレーキロータを介して車輪（いずれも図示せず）がボルト１７で取付けられる。   In assembling the wheel bearing device to the vehicle, the stem portion 13a of the outer ring 13 serving as one joint member of the constant velocity joint 12 is inserted into the through hole 11 of the hub wheel 9, and the spline on the outer periphery of the stem portion 13a. 13aa (FIG. 1) and the spline groove 11aa on the inner peripheral surface of the through hole 11 are spline-fitted, and the constant velocity joint outer ring 13 is attached to the inner member 2 by tightening the nut 14 that is screwed to the tip of the stem portion 13a. Join. At this time, the step surface 13 b facing the outboard side provided in the constant velocity joint outer ring 13 is pressed against the end surface 10 a facing the inboard side of the inner ring 10, and the inner member 2 is formed by the constant velocity joint outer ring 13 and the nut 14. Is tightened. The hub flange 9a for wheel attachment is located at the end of the hub wheel 9 on the outboard side, and a wheel (not shown) is attached to the hub flange 9a with a bolt 17 via a brake rotor.

この構成の車輪用軸受装置によると、内輪１０の内周面に段差部１６を設け、ハブ輪９の加締加工による塑性変形部分９ｃを前記段差部１６の軸方向に向く面（ここではテーパ面１６ｂ）に係合させたので、車両への組付工程において発生する外力による内輪１０のハブ輪９からの抜けを防止できる。段差部１６は、内輪１０の内周縁というごく限られた範囲のものとしたため、内輪の抜け耐力を確保しながら、段差部１６をできるだけ小さなものとできる。このため、段差部１６を設けながら内輪１０の端面１０ａの面積の減少が少なく、等速ジョイント外輪１３の段面１３ｂとの接触面圧の増加が抑制され、摩耗や異音の発生を防止できる。
内輪１０の前記段差部１６はできるだけ小さなものとし、また焼き入れ処理するが、内輪１０の段差部１６の内面における軸方向を向く面であるテーパ面１６ｂを、焼入れ処理前に旋削された旋削仕上げ面とすることにより、必要な内輪抜け耐力を確保することができる。焼入れ処理前に旋削された旋削仕上げ面とするため、研削加工等の工程を追加する必要がない。
内輪１０は、小部品であって軌道面４を有し、かつハブ輪９に内径面が嵌合することから、前記したように表面から芯部までの全体を焼入れ処理により硬化させたものとすることで、転動寿命に優れ、かつ嵌合面の耐摩耗性に優れたものとなる。 According to the wheel bearing device of this configuration, the step portion 16 is provided on the inner peripheral surface of the inner ring 10, and the plastic deformation portion 9 c due to the caulking process of the hub wheel 9 faces the axial direction of the step portion 16 (here, tapered). Since it is engaged with the surface 16b), it is possible to prevent the inner ring 10 from coming off from the hub wheel 9 due to an external force generated in the assembly process to the vehicle. Since the stepped portion 16 has a very limited range of the inner periphery of the inner ring 10, the stepped portion 16 can be made as small as possible while ensuring the slip-off resistance of the inner ring. For this reason, there is little decrease in the area of the end surface 10a of the inner ring 10 while providing the stepped portion 16, the increase in contact surface pressure with the step surface 13b of the constant velocity joint outer ring 13 is suppressed, and the occurrence of wear and noise can be prevented. .
The step portion 16 of the inner ring 10 is made as small as possible and is subjected to a quenching process, but the taper surface 16b that is an axially facing surface on the inner surface of the step portion 16 of the inner ring 10 is turned before the quenching process. By using the surface, it is possible to ensure the necessary inner ring slip-off strength. Since the surface is turned before the quenching process, there is no need to add a process such as grinding.
Since the inner ring 10 is a small part, has a raceway surface 4 and the inner diameter surface is fitted to the hub ring 9, the entire surface from the surface to the core is hardened by quenching as described above. By doing so, the rolling life is excellent and the wear resistance of the fitting surface is excellent.

また、段差部１６の内面を、円筒面からなるストレート部１６ａと、このストレート部１６ａの端部から内輪１０の内周面に続くテーパ面１６ｂとしたので、このテーパ面１６ｂを垂直面とする場合に比べて、ハブ輪９の塑性変形部分９ｃが加締加工されるときに、隙間なく接触するように塑性変形し、段差部１６との係合の信頼性が優れたものとなる。そのため、塑性変形部分９ｃの加締加工が容易である。   Further, since the inner surface of the stepped portion 16 is a straight portion 16a formed of a cylindrical surface and a tapered surface 16b continuing from the end of the straight portion 16a to the inner peripheral surface of the inner ring 10, the tapered surface 16b is a vertical surface. Compared to the case, when the plastic deformation portion 9c of the hub wheel 9 is crimped, it is plastically deformed so as to come into contact with no gap, and the reliability of the engagement with the stepped portion 16 is excellent. Therefore, the caulking process of the plastic deformation portion 9c is easy.

また、この車輪用軸受装置では、ハブ輪９における軌道面４を焼入れ処理した表面硬化処理面としているため、転動寿命を確保できる。加締加工部である塑性変形部分９ｂは非熱処理部としているため、加締加工を容易に行える。内輪１０は小部品であって軌道面４を有し、かつハブ輪９に内径面が嵌合することから、前記したように表面から芯部までの全体を焼入れ処理により硬化させたものとすることで、転動寿命に優れ、かつ嵌合面の耐摩耗性に優れたものとなる。   Moreover, in this wheel bearing device, since the raceway surface 4 of the hub wheel 9 is a hardened surface, the rolling life can be ensured. Since the plastic deformation part 9b which is a caulking part is a non-heat-treating part, the caulking process can be easily performed. Since the inner ring 10 is a small part and has the raceway surface 4 and the inner diameter surface is fitted to the hub ring 9, the entire surface from the surface to the core is hardened by quenching as described above. Thus, the rolling life is excellent and the wear resistance of the fitting surface is excellent.

また、ハブ輪９の貫通孔１１は、スプライン溝１１ａａが形成された一般径部分１１ａよりもインボード側の部分を、塑性変形部分９ｃの内周面となる大径段差部１１ｂと、この大径段差部１１ｂよりも小径で前記一般径部分よりも大径となる中間径段差部１１ｃとでなる２段の段付き形状としたため、中間径段差部１１ｃが、等速ジョイント外輪１３のステム部１３ａを挿入するときの案内となり、組立性がより向上する。   In addition, the through hole 11 of the hub wheel 9 has a large-diameter step portion 11b serving as an inner peripheral surface of the plastic deformation portion 9c, a portion on the inboard side of the general diameter portion 11a in which the spline groove 11aa is formed, and the large diameter step portion 11b. The intermediate stepped portion 11c has a stem portion of the constant velocity joint outer ring 13 because the intermediate stepped portion 11c has a stepped shape having an intermediate diameter stepped portion 11c having a diameter smaller than the diameter stepped portion 11b and larger than the general diameter portion. As a guide when inserting 13a, the assemblability is further improved.

この発明の一実施形態にかかる車輪用軸受装置の断面図である。It is sectional drawing of the wheel bearing apparatus concerning one Embodiment of this invention. 同車輪用軸受装置のハブ輪加締前の部分拡大断面図である。It is a partial expanded sectional view before hub wheel caulking of the bearing device for the wheels. 同車輪用軸受装置のハブ輪加締後の部分拡大断面図である。It is a partial expanded sectional view after hub wheel caulking of the bearing device for the wheels. 従来例の断面図である。It is sectional drawing of a prior art example. 従来例の部分拡大断面図である。It is a partial expanded sectional view of a prior art example.

符号の説明Explanation of symbols

１…外方部材
２…内方部材
３…外方部材の軌道面
４…内方部材の軌道面
５…転動体
９…ハブ輪
９ａ…ハブフランジ
９ｃ…塑性変形部分
１０…内輪
１０ａ…内輪端面
１１…貫通孔
１１ａ…貫通孔の一般径部分
１１ａａ…スプライン溝
１１ｂ…貫通孔の大径段差部
１１ｃ…貫通孔の中間径段差部
１３…等速ジョイント外輪
１３ａ…等速ジョイント外輪のステム部
１３ａａ…ステム部のスプライン
１６…内輪の段差部
１６ａ…内輪段差部のストレート部
１６ｂ…内輪段差部のテーパ面 DESCRIPTION OF SYMBOLS 1 ... Outer member 2 ... Inner member 3 ... Outer member raceway surface 4 ... Inner member raceway surface 5 ... Rolling element 9 ... Hub ring 9a ... Hub flange 9c ... Plastic deformation part 10 ... Inner ring 10a ... Inner ring end surface DESCRIPTION OF SYMBOLS 11 ... Through-hole 11a ... General diameter part 11aa of a through-hole ... Spline groove 11b ... Large diameter level | step-difference part 11c of a through-hole ... Middle diameter level | step-difference part 13 of a through-hole ... Constant velocity joint outer ring 13a ... Stem part 13aa of a constant velocity joint outer ring ... Stem spline 16 ... Inner ring step part 16a ... Inner ring step part straight part 16b ... Inner ring step part taper surface

Claims (3)

内周に複列の軌道面を有する外方部材と、これら軌道面に対向する軌道面を有する内方部材と、対向する軌道面間に介在した複列の転動体とを備え、上記内方部材が、車輪取付用のハブフランジを外周に有し中心に貫通孔を有するハブ輪と、このハブ輪のインボード側端の外周に嵌合した内輪とでなり、これらハブ輪および内輪に前記各列の軌道面を形成し、前記ハブ輪が等速ジョイントの外輪と結合されて前記内輪のインボード側に向く端面が前記等速ジョイントの外輪に設けられたアウトボード側に向く段面に押し付けられる駆動輪支持用の車輪用軸受装置において、
前記内輪の内周面におけるインボード側端に、この内輪のインボード側の端面まで続き、この端面の内周縁に、車両への組立工程における内輪の抜けを防止し得る程度に小さな深さの段差部を設け、この段差部の内面を、円筒面からなるストレート部と、このストレート部の端部から内輪の内周面に続くテーパ面とでなる形状とし、前記ハブ輪の加締加工により前記内輪の前記段差部の前記テーパ面に係合する塑性変形部分を設け、この塑性変形部分は前記内輪の端面から突出しないものとし、前記内輪は表面から芯部までの全体を焼入れ処理により硬化させたものとし、この内輪の前記段差部の内面における前記テーパ面を、前記焼入れ処理よりも前に旋削された旋削仕上げ面としたことを特徴とする車輪用軸受装置。 An outer member having a double-row raceway surface on the inner periphery, an inner member having a raceway surface facing these raceway surfaces, and a double-row rolling element interposed between the opposing raceway surfaces, The member includes a hub wheel having a hub flange for wheel mounting on the outer periphery and a through hole in the center, and an inner ring fitted to the outer periphery of the inboard side end of the hub wheel. A raceway surface of each row is formed, and the end surface facing the inboard side of the inner ring is coupled to the outer ring of the constant velocity joint, and the step surface facing the outboard side provided on the outer ring of the constant velocity joint In the wheel bearing device for driving wheel support to be pressed ,
The inner ring has an inboard side end on the inner peripheral surface that extends to the end surface on the inboard side of the inner ring, and has a depth that is small enough to prevent the inner ring from coming off during the assembly process to the vehicle. only setting the step portion, the inner surface of the stepped portion, and a straight portion formed of the cylindrical surface, a shape formed by the end of the straight portion and the inner peripheral surface subsequent tapered surface of the inner ring, caulking before Symbol hub wheel A plastically deformed portion that engages with the tapered surface of the step portion of the inner ring is formed by machining, the plastically deformed portion does not protrude from the end surface of the inner ring, and the inner ring is quenched from the entire surface to the core portion. The wheel bearing device according to claim 1, wherein the tapered surface on the inner surface of the step portion of the inner ring is a turning finished surface that is turned before the quenching treatment. 請求項１において、前記ハブ輪の軌道面は焼入れ処理した表面硬化処理面とした車輪用軸受装置。 Oite to claim 1, the raceway surface of the hub wheel is hardened treated surface hardening surface and the wheel bearing apparatus. 請求項１または請求項２において、前記ハブ輪の前記貫通孔は、前記等速自在継手のステム部の外周のスプラインと噛み合うスプライン溝を内周面に有し、前記貫通孔の内周面における前記スプライン溝が形成された一般径部分よりもインボード側の部分を、前記塑性変形部分の内周面となる大径段差部と、この大径段差部よりも小径で前記一般径部分よりも大径となる中間径段差部とでなる２段の段付き形状とした車輪用軸受装置。 3. The through hole of the hub wheel according to claim 1 , wherein the through hole of the hub wheel has a spline groove on an inner peripheral surface thereof that meshes with a spline of an outer periphery of the stem portion of the constant velocity universal joint. A portion on the inboard side with respect to the general diameter portion where the spline groove is formed, a large diameter step portion which becomes an inner peripheral surface of the plastic deformation portion, and a smaller diameter than the large diameter step portion and more than the general diameter portion. A wheel bearing device having a stepped shape with two steps including an intermediate diameter step portion having a large diameter.
JP2005208186A 2005-06-02 2005-07-19 Wheel bearing device Active JP4467482B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2005208186A JP4467482B2 (en) 2005-07-19 2005-07-19 Wheel bearing device
US11/444,343 US7874734B2 (en) 2005-06-02 2006-06-01 Wheel support bearing assembly
EP06011320A EP1729021B1 (en) 2005-06-02 2006-06-01 Wheel support bearing assembly
DE200660011816 DE602006011816D1 (en) 2005-06-02 2006-06-01 wheel bearing unit

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