JP4467481B2 - Wheel bearing device - Google Patents

Wheel bearing device Download PDF

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JP4467481B2
JP4467481B2 JP2005208185A JP2005208185A JP4467481B2 JP 4467481 B2 JP4467481 B2 JP 4467481B2 JP 2005208185 A JP2005208185 A JP 2005208185A JP 2005208185 A JP2005208185 A JP 2005208185A JP 4467481 B2 JP4467481 B2 JP 4467481B2
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inner ring
wheel
hub
ring
diameter
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JP2007024203A (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 US11/444,343 priority patent/US7874734B2/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４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３０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. 4 is proposed as a wheel bearing device for driving wheel support (for example, patent document 1). This is because the balls 25 are interposed in double rows between the raceway surfaces 23 and 24 where the outer member 21 and the inner member 22 face each other, and the inner member 22 is a hub wheel having a wheel mounting hub flange 29a on the outer periphery. 29 and an inner ring 30 fitted to the outer periphery of the inboard side end of the hub wheel 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 30 and is spline-fitted, 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 distal end 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外径側に拡径変形させて前記内輪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 wheel hub 29 by expanded deformation on the outer diameter side 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ある。
（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に形成する段部３６の径方向段差を、半径差で５〜７mm程度とする必要が有る。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程度にする必要が有る。このように内輪段部３６の軸方向長さが長くなると、ボール接触角の延長線上に内輪段部３６が位置する傾向があり、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 ring 29 is large, the radial step of the step portion 36 formed at the inboard side end portion of the inner ring 30 needs to have a radius difference of about 5 to 7 mm. 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. As described above, when the axial length of the inner ring step portion 36 is increased, the inner ring step portion 36 tends to be positioned on the extended line of the ball contact angle, and deformation of the inner ring due to a load load during operation increases, resulting in a short life. there is a possibility. 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、特に軸受運転時のハブ輪の内輪嵌合部の摩耗と、加締によるハブ輪の端部の割れが防止できる車輪用軸受装置を提供することである。   The object of the present invention is to prevent the inner ring from slipping off during the assembly process to the vehicle without adversely affecting the bearing function, and in particular, wear of the inner ring fitting portion of the hub ring during bearing operation and the end of the hub ring due to caulking. It is providing the wheel bearing apparatus which can prevent a crack of a part.

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設けられた内輪嵌合面部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であり、かつボール接触角が背面合わせとなる複列のアンギュラ玉軸受型の車輪用軸受装置において、次の構成としたものである。
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の軸方向に向く段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する。この塑性変形部分は非熱処理部とする。前記ハブ輪の外周面における前記軌道面から前記内輪嵌合面部に渡り高周波焼入れによる硬化層を設ける。この硬化層のインボード側端を、内輪の軌道面における接触角を成す直線と前記内輪嵌合面部との交点から、内輪の前記段差部の前記軸方向に向く段面がハブ輪と交わる交点までの間に設定する。 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 ring, and the inner member has a hub flange for mounting a wheel on the outer periphery and a through hole in the center, and an inner ring fitting provided on the outer periphery of the inboard side end of the hub ring. The inner ring is fitted to the surface portion, the hub ring and the inner ring form the raceway surface of each row , the hub ring is coupled to the outer ring of the constant velocity joint, and the end face facing the inboard side of the inner ring is the a drive wheel for supporting pressed against the stepped surface facing the outboard side which is provided on the outer ring of the constant velocity joint, and in angular contact ball bearing type bearing device for a wheel double row ball contact angle becomes back to back, next The configuration is as follows.
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. A step portion is provided, and a plastic deformation portion is provided that engages with a step surface of the inner ring facing the axial direction by crimping the hub ring, and the plastic deformation portion does not protrude from the end surface of the inner ring. Stuff. This plastically deformed portion is a non-heat treated portion. A hardened layer by induction hardening is provided from the raceway surface on the outer peripheral surface of the hub wheel to the inner ring fitting surface portion. The inboard side end of the hardened layer is an intersection point where the step surface portion of the inner ring in the axial direction intersects the hub ring from the intersection point of the straight line forming the contact angle on the raceway surface of the inner ring and the inner ring fitting surface portion. Set until.

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内に係合させたので、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。ハブ輪の外周面における軌道面から内輪嵌合面部に渡り高周波焼入れによる硬化層を設けているので、軸受運転時におけるハブ輪の軸部の耐摩耗性が向上する。ハブ輪の塑性変形部分は非熱処理部としたため、加締加工が容易に行える。前記硬化層のインボード側端は、内輪の軌道面における接触角を成す直線と内輪嵌合面部との交点から、内輪の段差部の軸方向に向く段面がハブ輪と交わる交点までの間に設定したので、ハブ輪の塑性変形部分を加締加工するときに、ハブ輪のインボード側端部に割れが発生することが防止される。
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 due to the caulking process of the hub wheel is engaged in the step portion, so that the inner ring of the inner ring due to the external force generated in the assembly process to the vehicle is It is possible to prevent the hub wheel from coming off. Since the hardened layer by induction hardening is provided from the raceway surface on the outer peripheral surface of the hub wheel to the inner ring fitting surface portion, the wear resistance of the shaft portion of the hub wheel is improved during the bearing operation. Since the plastic deformation portion of the hub wheel is a non-heat treated portion, it can be easily crimped. The inboard side end of the hardened layer is between the intersection of the straight line forming the contact angle on the raceway surface of the inner ring and the inner ring fitting surface portion, and the intersection where the step surface facing the axial direction of the step portion of the inner ring intersects the hub ring. Therefore, when the plastic deformation portion of the hub ring is caulked, it is possible to prevent the hub ring from being cracked at the end on the inboard side.
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.

この発明において、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ても良い。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、内輪の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できる。   In the present invention, the entire inner ring from the surface to the core may be hardened by a quenching process. Since the inner ring is a small part and has a raceway surface, and the inner diameter surface is fitted to the hub ring, the entire surface from the surface of the inner ring to the core is hardened by a quenching process. It has excellent service life and excellent wear resistance on the mating surface.

この発明において、前記ハブ輪の前記貫通孔は、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段の段付き形状とする。
上記のように貫通孔のインボード側端を２段の段付き形状とすると、中間径段差部が、等速ジョイント外輪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 is a large-diameter step portion that becomes an inner peripheral surface of the plastic deformation portion, and an intermediate diameter that is smaller than the large-diameter step portion and larger than the general-diameter portion. A stepped shape having two steps including a stepped portion is used .
When the inboard side end of the through hole is formed in a two-stepped shape as described above, the intermediate diameter step portion serves as a guide when inserting the stem portion of the constant velocity joint outer ring, 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設けられた内輪嵌合面部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であり、かつボール接触角が背面合わせとなる複列のアンギュラ玉軸受型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、前記ハブ輪の加締加工により前記内輪の前記段差部の軸方向に向く段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この塑性変形部分は非熱処理部とし、前記ハブ輪の外周面における前記軌道面から前記内輪嵌合面部に渡り高周波焼入れによる硬化層を設け、この硬化層のインボード側端を、内輪の軌道面における接触角を成す直線と前記内輪嵌合面部との交点から、内輪の前記段差部の前記軸方向に向く段面がハブ輪と交わる交点までの間に設定したため、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することができ、特に軸受運転時のハブ輪の内輪嵌合部の摩耗と、加締によるハブ輪の端部の割れが防止できる。
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 ring, and the inner member has a hub flange for mounting a wheel on the outer periphery and a through hole in the center, and an inner ring fitting provided on the outer periphery of the inboard side end of the hub ring. The inner ring is fitted to the surface portion, the hub ring and the inner ring form the raceway surface of each row , the hub ring is coupled to the outer ring of the constant velocity joint, and the end face facing the inboard side of the inner ring is the a drive wheel for supporting pressed against the stepped surface facing the outboard side which is provided on the outer ring of the constant velocity joint, and in angular contact ball bearing type bearing device for a wheel double row ball contact angle becomes back to back, the inboard in the inner circumferential surface of the inner ring The end, continues to the end face of the inner ring of the inboard side, the inner peripheral edge of the end face, a small depth of the stepped portion to the extent capable of preventing the inner ring of the omission provided in the assembly process of the vehicle, addition of the hub wheel A plastic deformation portion that engages with the step surface of the inner ring that faces in the axial direction by tightening is provided, the plastic deformation portion does not protrude from the end surface of the inner ring, and the plastic deformation portion is a non-heat treated portion, A hardened layer by induction hardening is provided from the raceway surface on the outer peripheral surface of the hub ring to the inner ring fitting surface portion, and an inboard side end of the hardened layer is connected to a straight line forming a contact angle on the raceway surface of the inner ring and the inner ring fitting. Since it is set between the intersection point with the mating surface and the intersection point where the stepped portion of the inner ring in the axial direction intersects with the hub wheel, the inner ring is removed in the assembly process to the vehicle without adversely affecting the bearing function. Can be prevented, especially prevention and wear of the inner fitting portion of the hub wheel during the bearing operation, cracks of the end portion of the hub wheel by caulking.

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ボール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、ボール５は各列毎に保持器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 balls 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 balls 5 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、軸部９ｂ、およびこの軸部９ｂの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。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 member on the rotation side, and includes a shaft portion 9b, a hub wheel 9 having a wheel flange 9a on the outer periphery of the shaft portion 9b, and a shaft portion 9b of the hub wheel 9. And an inner ring 10 fitted to the outer periphery of the inboard side end. 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. The entire inner ring 10 from the surface to the core is hardened by a quenching process.

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、軸方向に向く段面１６ｂとでなる形状とされている。段面１６ｂは、軸受軸方向に沿う断面が直線または曲線となる傾斜面とされている。なお段面１６ｂは、軸方向に垂直な面であっても良い。   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 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 stepped surface 16b facing in the axial direction. The step surface 16b is an inclined surface whose cross section along the bearing axial direction is a straight line or a curve. The step surface 16b may be a surface perpendicular to the axial direction.

ハブ輪９のインボード側端には、加締加工により内輪１０の段差部１６の軸方向に向く段面１６ｂに係合する塑性変形部分９ｂが設けてある。なお、図２は塑性変形部分９ｂ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９ｂ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う。ハブ輪９の加締加工を行う塑性変形部分９ｂは非熱処理部とされている。   At the inboard side end of the hub wheel 9, a plastically deformed portion 9b that engages with a step surface 16b facing the axial direction of the stepped portion 16 of the inner ring 10 by caulking is provided. 2 shows the state of the plastic deformation portion 9b before caulking, and FIG. 3 shows the state after caulking. The plastic deformation portion 9b 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 diameter expansion caulking that expands the entire circumference of the inboard side end of the hub wheel 9. The plastic deformation portion 9b for performing the caulking process of the hub wheel 9 is a non-heat treated portion.

ハブ輪９の外周面における前記軌道面４から前記内輪嵌合面部１５に渡り、高周波焼入れによる硬化層１８が設けられている。この硬化層１８のインボード側端は、内輪１０の軌道面４における接触角θを成す直線Ｌと内輪嵌合面部１５との交点Ａから、内輪１０の段差部１６の軸方向に向く段面１６ｂがハブ輪９と交わる交点Ｃまでの区間Ｂの間に設定されている。   A hardened layer 18 is provided by induction hardening from the raceway surface 4 to the inner ring fitting surface portion 15 on the outer peripheral surface of the hub wheel 9. The inboard side end of the hardened layer 18 is a step surface facing the axial direction of the step portion 16 of the inner ring 10 from the intersection A between the straight line L forming the contact angle θ on the raceway surface 4 of the inner ring 10 and the inner ring fitting surface portion 15. 16b is set during the section B up to the intersection C where the hub wheel 9 intersects.

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９ｂ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的径部分１１ａのスプライン溝１１ａａの溝底径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 from the general diameter portion 11a includes a large-diameter step portion 11b serving as an inner peripheral surface of the plastic deformation portion 9b, and the general-diameter portion 11a having a smaller diameter than the large-diameter step portion 11b. The spline groove 11aa has a stepped shape with two steps formed by an intermediate diameter step portion 11c having a diameter larger than the groove bottom diameter.

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. 13 aa and the spline groove 11 aa on the inner peripheral surface of the through hole 11 are spline-fitted, and the constant velocity joint outer ring 13 is coupled to the inner member 2 by tightening a nut 14 that is screwed to the tip of the stem portion 13 a. 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９ｂを前記段差部１６内に係合させたので、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。
ハブ輪９の外周面における軌道面４から内輪嵌合面部１５に渡る範囲には、高周波焼入れによる硬化層１８を設けたので、軸受運転時におけるハブ輪９の軸部の耐摩耗性が向上する。ハブ輪９の塑性変形部分９ｂは非熱処理部としたため、加締加工が容易に行える。硬化層１８のインボード側端は、内輪１０の軌道面４における接触角θを成す直線Ｌと内輪嵌合面部１５との交点Ａから、内輪１０の段差部１６の軸方向に向く段面１６ｂがハブ輪９と交わる交点Ｃまでの区間Ｂ内に設定したので、ハブ輪９の塑性変形部分９ｂを加締加工するときに、ハブ輪９のインボード側端部に割れが発生することが防止される。 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 9b by the caulking process of the hub wheel 9 is engaged in the step portion 16, so that the vehicle 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.
Since the hardened layer 18 is provided by induction hardening in the range from the raceway surface 4 to the inner ring fitting surface portion 15 on the outer peripheral surface of the hub wheel 9, the wear resistance of the shaft portion of the hub wheel 9 is improved during bearing operation. . Since the plastic deformation portion 9b of the hub wheel 9 is a non-heat treated portion, the caulking process can be easily performed. The inboard side end of the hardened layer 18 is a step surface 16 b that faces the axial direction of the step portion 16 of the inner ring 10 from the intersection A of the straight line L that forms the contact angle θ on the raceway surface 4 of the inner ring 10 and the inner ring fitting surface portion 15. Is set in the section B up to the intersection C where it intersects with the hub wheel 9, so that when the plastic deformation portion 9b of the hub wheel 9 is caulked, the end portion on the inboard side of the hub wheel 9 may be cracked. Is prevented.

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１０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。   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 10. For this reason, there is little decrease in the area of the end surface of the inner ring 10 while providing the stepped portion 16, the increase of the 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. 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９ｂ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 which is an inner peripheral surface of the plastic deformation portion 9b, and a large-diameter step portion 11b on the inboard side of the general diameter portion 11a where the spline groove 11aa is formed. Since the two-step stepped shape is formed by the intermediate diameter step portion 11c having a smaller diameter than the diameter step portion 11b and a larger diameter than the general diameter portion 11a, the intermediate diameter step portion 11c is a stem of the constant velocity joint outer ring 13. As a guide when inserting the portion 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
９ｂ…塑性変形部分
１０…内輪
１０ａ…内輪端面
１１…貫通孔
１１ａ…一般径部分
１１ａａ…スプライン溝
１１ｂ…大径段差部
１１ｃ…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
１５…内輪嵌合面部
１６…内輪の段差部
１６ｂ…段面
１８…硬化層 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 9b ... Plastic deformation part 10 ... Inner ring 10a ... End surface of inner ring DESCRIPTION OF SYMBOLS 11 ... Through-hole 11a ... General diameter part 11aa ... Spline groove 11b ... Large diameter step part 11c ... Intermediate diameter step part 13 ... Constant velocity joint outer ring 13a ... Stem part 13aa of constant velocity joint outer ring ... Spline 15 of stem part ... Inner ring fitting Interfacing portion 16 ... Step portion 16b of inner ring ... Step surface 18 ... Hardened layer

Claims (2)

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設けられた内輪嵌合面部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であり、かつボール接触角が背面合わせとなる複列のアンギュラ玉軸受型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、前記ハブ輪の加締加工により前記内輪の前記段差部の軸方向に向く段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、この塑性変形部分は非熱処理部とし、前記ハブ輪の外周面における前記軌道面から前記内輪嵌合面部に渡り高周波焼入れによる硬化層を設け、この硬化層のインボード側端を、内輪の軌道面における接触角を成す直線と前記内輪嵌合面部との交点から、内輪の前記段差部の前記軸方向に向く段面がハブ輪と交わる交点までの間に設定し、前記ハブ輪の前記貫通孔は、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 consists of 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 an inner ring fitting surface portion provided on the outer periphery of the inboard side end of the hub wheel. The hub wheel and the inner ring are formed with raceways of the respective rows, and the hub ring is coupled 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. a drive wheel for supporting pressed against the stepped surface facing the outboard side, and the wheel bearing apparatus of the angular contact ball bearing type double row ball contact angle becomes back to back,
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. A step portion is provided, and a plastic deformation portion that engages with a step surface facing the axial direction of the step portion of the inner ring is provided by crimping the hub ring, and the plastic deformation portion does not protrude from the end surface of the inner ring. The plastic deformation portion is a non-heat treated portion, and a hardened layer is provided by induction hardening from the raceway surface on the outer peripheral surface of the hub wheel to the inner ring fitting surface portion, and the inboard side end of the hardened layer is used as an inner ring raceway. A distance between the intersection of the straight line forming the contact angle on the surface and the inner ring fitting surface portion and the intersection of the step portion of the inner ring facing the axial direction intersecting the hub wheel, and the penetration of the hub wheel. The hole is a constant velocity joint A spline groove that meshes with a spline on the outer periphery of the stem portion on the inner peripheral surface, and a portion of the inner peripheral surface of the through hole that is closer to the inboard side than the general diameter portion where the spline groove is formed It is characterized by a two-step stepped shape consisting of a large-diameter step portion that becomes the inner peripheral surface of the inner diameter step and an intermediate-diameter step portion that is smaller in diameter than the large-diameter step portion and larger in diameter than the general-diameter portion. Wheel bearing device. 請求項１において、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車輪用軸受装置。   The wheel bearing device according to claim 1, wherein the inner ring is hardened by quenching the entire surface from the surface to the core.
JP2005208185A 2005-06-02 2005-07-19 Wheel bearing device Active JP4467481B2 (en)

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JP2005208185A JP4467481B2 (en) 2005-07-19 2005-07-19 Wheel bearing device
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EP06011320A EP1729021B1 (en) 2005-06-02 2006-06-01 Wheel support bearing assembly

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