JP4526455B2 - Wheel bearing device and caulking method thereof - Google Patents

Wheel bearing device and caulking method thereof Download PDF

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JP4526455B2
JP4526455B2 JP2005205184A JP2005205184A JP4526455B2 JP 4526455 B2 JP4526455 B2 JP 4526455B2 JP 2005205184 A JP2005205184 A JP 2005205184A JP 2005205184 A JP2005205184 A JP 2005205184A JP 4526455 B2 JP4526455 B2 JP 4526455B2
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caulking
diameter
inner ring
wheel
bearing device
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JP2007024131A (en
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和則 久保田
浩司 松永
潤 沼本
啓 藤村
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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
Priority to EP06011320A priority patent/EP1729021B1/en
Priority to DE200660011816 priority patent/DE602006011816D1/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction 

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  • Mounting Of Bearings Or Others (AREA)

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、およびその加締加工方法に関する。   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, and a caulking method thereof.

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 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 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 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。これにより、車両への組付け時に発生する外力による内輪３０の抜けを防止している。
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 side end of the hub wheel 29 is expanded and deformed to the outer diameter side and is crimped to the step portion 36 of the inner ring 30. As a result, the inner ring 30 is prevented from coming off due to an external force generated at the time of assembly to the vehicle.
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、図５の一部を拡大して示す図６のように、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、図６のように内輪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 wheel 29 is large, the radial step of the step portion 36 formed at the end portion on the inboard side of the inner ring 30 is shown in FIG. The radius difference needs to be 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) If 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 7 as shown in FIG. It needs to be about ~ 8mm. 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、特に低い加工力で加締加工が可能な車輪用軸受装置およびその加締加工方法を提供することである。   SUMMARY OF THE INVENTION An object of the present invention is to provide a wheel bearing device and a caulking method therefor that can prevent the inner ring from slipping off during the assembly process to the vehicle without adversely affecting the bearing function and that can be caulked with a particularly low machining force. It is to be.

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た駆動輪支持用の車輪用軸受装置において、次の構成としたものである。
すなわち、前記内輪の内周面に、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相当する深さの段差部を設ける。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加締部を設け、この加締部は前記内輪の端面から突出しないものとする。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、インボード側端の大径段差部と、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。前記加締部は、加締加工前は内径面が前記大径段差部の一部となる円筒状部分であって、この円筒状部分が拡径状態に加締められた部分である。また、前記ハブ輪の前記中間径段差部を、前記内輪の段差部の軸方向位置よりも軸方向に深い位置とする。換言すれば、前記ハブ輪の前記中間径段差部のインボード側端を、前記内輪の段差部のアウトボード側端の軸方向位置よりもアウトボード側の位置とする。 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 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 wheel bearing device for driving wheel support, which is composed of an inner ring fitted to the surface portion and in which the raceway surfaces of each row are formed on the hub wheel and the inner ring, has the following configuration.
That is, a step portion having a depth corresponding to the inner peripheral edge of the end surface is provided on the inner peripheral surface of the inner ring up to the end surface on the inboard side of the inner ring. A caulking portion that engages with a step surface of the inner ring facing in the axial direction is provided by caulking processing of the hub ring, and the caulking portion does not protrude from the end surface of the inner ring. The through hole of the hub wheel has a spline groove that meshes with a spline on the outer periphery of the stem portion of the constant velocity universal joint, and a general diameter portion in which the spline groove is formed on the inner peripheral surface of the through hole. The inboard side portion is a two-stage step consisting of a large diameter step portion at the end of the inboard side and an intermediate diameter step portion having a smaller diameter than the large diameter step portion and a larger diameter than the general diameter portion. It shall be the per shape. The caulking portion is a cylindrical portion whose inner diameter surface becomes a part of the large diameter step portion before caulking, and the cylindrical portion is a portion caulked in an expanded state. Also, the intermediate-diameter step difference portion of the hub wheel, shall be the deeper in the axial direction than the axial position of the inner ring of the stepped portion. In other words, the inboard side end of the intermediate diameter step portion of the hub wheel is positioned on the outboard side relative to the axial position of the outboard side end of the step portion of the inner ring.

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加締部を前記段差部内に係合させるので、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。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ているので、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の端面の面積の減少が少なく、等速自在継手の段面との接触面圧の増加が抑制され、内輪クリープ発生等による摩耗や異音の発生を防止できて軸受寿命低下を抑制できる。
貫通孔のインボード側端は２段の段付き形状としているので、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。
特に、ハブ輪の中間径段差部を、内輪の段差部の軸方向位置よりも軸方向に深い位置としているので、加締金型で加締部の加締加工を行うとき、加締金型の先端の導入部を加締部を越えて奥まで導入しても、加締金型が中間径段差部と干渉せず、加締加工を円滑に行うことができる。そのため、例えば先端外周がテーパ状の加締金型を用いることなどで、低い加工荷重で加締部の成形が可能となり軸受への加締加工時の負荷を小さくできる。
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, since the step portion is provided on the inner peripheral surface of the inner ring and the caulking portion by the caulking process of the hub wheel is engaged in the step portion, the hub of the inner ring due to the external force generated in the assembly process to the vehicle It can prevent the ring from coming off. Since the stepped portion has a very limited range of the inner periphery of the inner ring, the stepped portion 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 of the inner ring while providing the stepped portion, the increase in contact surface pressure with the step surface of the constant velocity universal joint is suppressed, and it is possible to prevent the occurrence of wear and noise due to the occurrence of inner ring creep, etc. Thus, it is possible to suppress a decrease in bearing life.
Since the inboard side end of the through hole has a two-stepped shape, 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.
In particular, since the intermediate diameter step of the hub ring is positioned deeper in the axial direction than the axial position of the step of the inner ring, the caulking die is used when caulking the caulking part with the caulking die. Even if the leading end introduction portion is introduced beyond the caulking portion, the caulking die does not interfere with the intermediate diameter step portion, and the caulking process can be performed smoothly. Therefore, for example, by using a caulking die having a tapered tip outer periphery, the caulking portion can be molded with a low machining load, and the load during caulking processing on the bearing can be reduced.
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、前記大径段差部の内径面が、この大径段差部の奥側に位置する加締金型導入部と、この加締金型導入部から開口側へ大径となり前記加締部の内周に位置するテーパ状部分とでなる形状であっても良い。   In this invention, the inner diameter surface of the large-diameter step portion has a large diameter from the crimping die introduction portion to the opening side, and the caulking die introduction portion located on the back side of the large-diameter step portion. The shape which consists of a taper-shaped part located in the inner periphery of a part may be sufficient.

この発明において、前記ハブ輪の前記加締部の硬度をＨＲＣ２８以下としても良い。このように加締部の硬度をＨＲＣ２８以下と低くすることで、加締加工をより低い加工荷重で行うことができる。   In the present invention, the hardness of the caulking portion of the hub wheel may be HRC28 or less. Thus, by reducing the hardness of the crimped portion to HRC28 or less, the crimping can be performed with a lower processing load.

この発明の車輪用軸受装置の加締部の加締加工方法は、この発明の車輪用軸受装置における前記加締部の加締加工方法であって、前記車輪用軸受装置における前記加締部は、加締加工前は内径面が前記大径段差部の一部となる円筒状部分とし、先端外周がテーパ状の押し当て面とされた加締金型の前記押当て面を前記円筒状部分の内周の開口縁に押し付けることにより、前記円筒状部分を拡径状態に加締めて前記加締部とするものである。
加締金型として上記のように先端外周がテーパ状の押し当て面とされたものを用いることにより、低い加工荷重で加締部の成形が可能となり軸受への加締加工時の負荷を小さくできる。 The caulking method of the caulking portion of the wheel bearing device of the present invention is a caulking method of the caulking portion in the wheel bearing device of the present invention, wherein the caulking portion in the wheel bearing device is Before the caulking process, the inner surface is a cylindrical portion that becomes a part of the large-diameter step portion, and the pressing surface of the caulking die whose outer periphery is a tapered pressing surface is the cylindrical portion. By pressing against the opening edge of the inner periphery, the cylindrical portion is caulked to an expanded state to form the caulking portion.
By using a crimping die with a tapered outer periphery at the tip as described above, it is possible to form a crimped part with a low machining load, and reduce the load during caulking on the bearing. it can.

この発明において、前記加締金型の前記押し当て面の面粗さを、Ｒａ１μｍ以下としても良い。
加締金型の押し当て面の面粗さをＲａ１μｍ以下と小さくした場合、加締部にかじりや凝着などによる、外観上または加工上の不具合を発生させることなく、円滑に加締加工を行うことができる。 In the present invention, the pressing surface of the caulking die may have a surface roughness Ra of 1 μm or less.
If the surface roughness of the pressing surface of the caulking die is reduced to Ra1μm or less, the caulking part can be caulked smoothly without causing defects in appearance or processing due to galling or adhesion. It can be carried out.

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た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、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相当する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加締部を設け、この加締部は前記内輪の端面から突出しないものとし、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、インボード側端の大径段差部と、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、前記加締部は、加締加工前は内径面が前記大径段差部の一部となる円筒状部分であって、この円筒状部分が拡径状態に加締められた部分であり、前記ハブ輪の前記中間径段差部のインボード側端を、前記内輪の段差部のアウトボード側端の軸方向位置よりもアウトボード側の位置としたため、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て、等速自在継手の段面との接触面圧の増加が抑制され、内輪クリープ発生等による軸受寿命低下の抑制が可能となり、また低い加工力で加締加工が可能となって軸受への加締加工時負荷を小さくでき、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る。 The wheel bearing device of the present invention comprises 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. In the wheel bearing device for driving wheel support, which is formed by an inner ring fitted to the surface portion, and the raceway surface of each row is formed on the hub wheel and the inner ring, the inner ring side of the inner ring is on the inboard side of the inner ring. A stepped portion having a depth corresponding to the inner peripheral edge of the end surface is provided, and a caulking portion that engages with a stepped surface facing the axial direction of the stepped portion of the inner ring by caulking processing of the hub ring is provided. Provided that the caulking portion does not protrude from the end face of the inner ring, The through hole has a spline groove on the inner peripheral surface that meshes with the spline on the outer periphery of the stem portion of the constant velocity universal joint, and is more inboard than the general diameter portion where the spline groove is formed on the inner peripheral surface of the through hole. The side portion has a two-step stepped shape including a large-diameter step portion at the inboard side end and an intermediate-diameter step portion having a smaller diameter than the large-diameter step portion and a larger diameter than the general diameter portion, the caulked portion, the unprocessed caulking a cylindrical portion whose inner diameter surface is part of the larger diameter section of difference portion is a portion where the cylindrical portion is caulked to the expanded state, before Symbol Since the inboard side end of the intermediate diameter step portion of the hub wheel is positioned on the outboard side relative to the axial position of the outboard side end of the inner ring step portion, the step portion is secured while ensuring the slip-off resistance of the inner ring. Can be made as small as possible and contact with the stepped surface of the constant velocity universal joint. Increase in surface pressure is suppressed, bearing life can be reduced due to the occurrence of inner ring creep, etc., and caulking can be performed with a low processing force, reducing the load during caulking on the bearing and improving the bearing function. Without causing adverse effects, it is possible to prevent the inner ring from falling off during the assembly process to the vehicle.

この発明の車輪用軸受装置の加締部の加締加工方法は、この発明の車輪用軸受装置における前記加締部の加締加工方法であって、車輪用軸受装置における前記加締部は、加締加工前は内径面が前記大径段差部の一部となる円筒状部分とし、先端外周がテーパ状の押し当て面とされた加締金型の前記押当て面を前記円筒状部分の内周の開口縁に押し付けることにより、前記円筒状部分を拡径状態に加締めて前記加締部とすることとしたため、低い加工荷重で容易に加締加工を行うことができて、軸受への加締加工時の負荷を小さくできる。   A caulking method of the caulking portion of the wheel bearing device of the present invention is a caulking method of the caulking portion in the wheel bearing device of the present invention, wherein the caulking portion in the wheel bearing device is Before the caulking process, the inner diameter surface is a cylindrical portion that becomes a part of the large-diameter stepped portion, and the pressing surface of the caulking die whose outer periphery is a tapered pressing surface is used as the cylindrical portion. By pressing against the opening edge of the inner periphery, the cylindrical portion is swaged to an expanded state to form the swaged portion, so that swaging can be easily performed with a low machining load. The load during caulking can be reduced.

この発明の一実施形態を図１ないし図４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、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を有する。 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.

図２および図４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 FIG. 2 and FIG. 4, 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に係合する加締部９ｃが設けてある。なお、図２は加締部９ｃの加締加工前の状態を、図４は加締加工後の状態をそれぞれ示す。加締部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。加締部９ｃの硬度はＨＲＣ２８以下とされている。   At the inboard side end of the hub wheel 9, a caulking portion 9 c that engages with a step surface 16 b facing the axial direction of the step portion 16 of the inner ring 10 by caulking is provided. 2 shows a state before the crimping process of the crimping portion 9c, and FIG. 4 shows a state after the crimping process. The caulking portion 9 c substantially fills the inside of the step portion 16 of the inner ring 10, but does not protrude from the end surface 10 a of the inner ring 10. The caulking portion 9c has a hardness of HRC28 or less.

上記加締加工は、図３に示す加締金型１８を用いて行われる。加締金型１８は、先端外周がテーパ状の押し当て面１８ａとされ、この押し当て面１８ａを加締部９ｃの円筒状部分の内周の開口縁に押し付け、加締部９ｃの円筒状部分を拡径状態に加締めることにより加締加工を行う。加締加工を可能とし、かつ連続した加工を可能とするために、加締金型１８の硬度は、少なくとも加締部９ｃよりも硬度を大きくする必要がある。そこで、この実施形態では、加締金型１８の素材として例えばＨＲＣ３０以上の硬度とした鋼や超硬合金等を用いる。この他に、加締金型１８は、表面処理により必要硬度とした材料を用いても良い。加締金型１８における前記押し当て面１８ａの面粗さはＲａ１μｍ以下とされている。   The crimping process is performed using a crimping die 18 shown in FIG. The caulking die 18 has a pressing surface 18a whose outer periphery is tapered, and this pressing surface 18a is pressed against the opening edge of the inner periphery of the cylindrical portion of the caulking portion 9c to form the cylindrical shape of the caulking portion 9c. The caulking process is performed by caulking the part in an expanded state. In order to enable caulking and continuous machining, it is necessary that the hardness of the caulking die 18 be at least greater than that of the caulking portion 9c. Therefore, in this embodiment, steel, cemented carbide, or the like having a hardness of HRC30 or higher is used as the material of the crimping mold 18, for example. In addition, the caulking die 18 may be made of a material having a required hardness by surface treatment. The surface roughness of the pressing surface 18a in the caulking die 18 is set to Ra1 μm or less.

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、インボード側端の大径段差部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。さらに、中間径段差部１１ｃのインボード側端が、内輪１０の段差部１６のアウトボード側端の軸方向位置Ａよりもアウトボード側の位置Ｂ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. In addition, the portion on the inboard side of the general diameter portion 11a includes a large-diameter step portion 11b at the end of the inboard side and a groove of the spline groove 11aa of the general diameter portion 11a having a smaller diameter than the large-diameter step portion 11b. A stepped shape with two steps is formed by an intermediate diameter step portion 11c having a diameter larger than the bottom diameter. Further, the inboard side end of the intermediate diameter step portion 11 c is set to a position B on the outboard side relative to the axial position A of the outboard side end of the step portion 16 of the inner ring 10.

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の加締加工による加締部９ｃ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。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、内輪クリープ発生等による摩耗や異音の発生を防止できて軸受寿命低下を抑制できる。
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、インボード側端の大径段差部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。 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 caulking portion 9c obtained by caulking 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 stepped portion 16 has a very limited range of the inner periphery of the inner ring 10, the stepped portion 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 in contact surface pressure with the step surface 13b of the constant velocity joint outer ring 13 is suppressed, and wear and noise due to the occurrence of inner ring creep etc. Occurrence can be prevented and bearing life reduction can be suppressed.
The through hole 11 of the hub wheel 9 has a portion on the inboard side with respect to the general diameter portion 11a in which the spline groove 11aa is formed, a large diameter step portion 11b on the inboard side end, and a smaller diameter than the large diameter step portion 11b. Therefore, when the intermediate diameter step portion 11c is inserted into the stem portion 13a of the constant velocity joint outer ring 13, the intermediate diameter step portion 11c has a two-step stepped shape. As a result, the assemblability is further improved.

中間径段差部１１ｃは、内輪１０の段差部１６の軸方向位置Ａよりも軸方向に深い位置Ｂとしているので、図３のように加締金型１８で加締部９ｃの加締加工を行うときに、加締金型１８の先端の導入部を加締部９ｃを越えて奥まで導入しても、加締金型１８が中間径段差部１１ｃと干渉せず、加締加工を円滑に行うことができる。そのため、加締金型１８として先端外周がテーパ状の押し当て面１８ａとされたものを用いることができて、低い加工荷重で加締部９ｃの成形が可能となり、軌道面３，４やボール５への加締加工時の負荷を小さくできる。   Since the intermediate diameter step portion 11c is set to a position B deeper in the axial direction than the position A in the axial direction of the step portion 16 of the inner ring 10, the crimping portion 9c is crimped by the crimping die 18 as shown in FIG. Even when the leading end of the caulking die 18 is introduced beyond the caulking portion 9c when performing, the caulking die 18 does not interfere with the intermediate diameter step portion 11c and the caulking process is smooth. Can be done. Therefore, it is possible to use a caulking die 18 having a tapered pressing surface 18a at the outer periphery of the tip, and the caulking portion 9c can be formed with a low processing load. The load during caulking to 5 can be reduced.

この実施形態では、加締部９ｃの硬度をＨＲＣ２８以下としていることからも、加締加工をより低い加工荷重で行うことができる。   In this embodiment, since the hardness of the caulking portion 9c is HRC28 or less, the caulking process can be performed with a lower processing load.

加締部９ｃの加締加工では、図２のように、加締加工前の加締部９ｃの内径面を、前記ハブ輪貫通孔１１の大径段差部１１ｂの一部となる円筒状部分とし、加締金型１８の先端外周のテーパ状の押し当て面１８ａを前記円筒状部分の内周の開口縁に押し付けることにより、前記円筒状部分を拡径状態に加締めて加締部９ｃとするので、低い加工荷重で容易に加締加工を行うことができる。
この加締加工において、加締金型１８は加締部９ｃに対して高い圧力で接するため、加工条件によっては、かじりや凝着などの発生により加締部９ｃの外観を損なう恐れがあり、場合によっては加締加工できなくなる恐れがある。しかし、この実施形態では、加締金型１８の押し当て面１８ａの面粗さがＲａ１μｍ以下とされているので、加締部９ｃにかじりや凝着などによる外観上または加工上の不具合を発生させることなく、円滑に加締加工を行うことができる。 In the caulking process of the caulking portion 9c, as shown in FIG. 2, the inner diameter surface of the caulking portion 9c before caulking is a cylindrical portion that becomes a part of the large-diameter step portion 11b of the hub wheel through hole 11. And pressing the tapered pressing surface 18a on the outer periphery of the end of the caulking die 18 against the opening edge on the inner periphery of the cylindrical portion, thereby caulking the cylindrical portion into a diameter-expanded state and tightening portion 9c. Therefore, caulking can be easily performed with a low processing load.
In this caulking process, the caulking die 18 comes into contact with the caulking part 9c at a high pressure, and depending on the machining conditions, the appearance of the caulking part 9c may be impaired due to the occurrence of galling or adhesion. In some cases, caulking may not be possible. However, in this embodiment, since the surface roughness of the pressing surface 18a of the caulking die 18 is set to Ra1 μm or less, problems in appearance or processing due to galling or adhesion occur in the caulking portion 9c. It is possible to perform the caulking process smoothly without causing it.

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加工の説明図である。It is explanatory drawing of the hub ring caulking process of the bearing apparatus 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…ボール
９…ハブ輪
９ａ…ハブフランジ
９ｃ…加締部
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…加締金型
１８ａ…押し当て面
DESCRIPTION OF SYMBOLS 1 ... Outer member 2 ... Inner member 3 ... Outer member raceway surface 4 ... Inner member raceway surface 5 ... Ball 9 ... Hub ring 9a ... Hub flange 9c ... Clamping part 10 ... Inner ring 10a ... Inner ring end surface 11 ... through hole 11a ... general diameter portion 11aa ... spline groove 11b ... large diameter step portion 11c ... intermediate diameter step portion 13 ... constant velocity joint outer ring 13a ... constant velocity joint outer ring stem portion 13aa ... stem portion spline 15 ... inner ring fitting Surface portion 16 ... Inner ring step portion 16b ... Step surface 18 ... Caulking die 18a ... Pressing surface

Claims (5)

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た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、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相当する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加締部を設け、この加締部は前記内輪の端面から突出しないものとし、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、インボード側端の大径段差部と、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、前記加締部は、加締加工前は内径面が前記大径段差部の一部となる円筒状部分であって、この円筒状部分が拡径状態に加締められた部分であり、前記ハブ輪の前記中間径段差部のインボード側端を、前記内輪の段差部のアウトボード側端の軸方向位置よりもアウトボード側の位置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. In the wheel bearing device for driving wheel support in which the raceway surface of each row is formed on the hub wheel and the inner ring,
A stepped portion having a depth corresponding to the inner peripheral edge of the inner ring is provided on the inner peripheral surface of the inner ring up to the end surface on the inboard side of the inner ring, and the stepped portion of the inner ring is formed by crimping the hub ring. A caulking portion that engages with an axially-facing step surface is provided, the caulking portion does not protrude from the end surface of the inner ring, and the through hole of the hub ring is formed on the outer periphery of the stem portion of the constant velocity universal joint. A spline groove that meshes with the spline is formed on the inner peripheral surface, and a portion on the inboard side of the inner peripheral surface of the through hole with respect to the general diameter portion where the spline groove is formed is a large-diameter step portion on the inboard side end. The intermediate diameter step portion is smaller in diameter than the large diameter step portion and larger in diameter than the general diameter portion. The caulking portion has an inner diameter surface before caulking. A cylindrical portion that becomes a part of the large-diameter step portion, and the cylindrical portion has an enlarged diameter. A crimping was part state, the intermediate-diameter step difference portion of the inboard-side end of the front SL wheel hub, and a position on the outboard side than the axial position of the outboard end of the inner ring of the stepped portion A wheel bearing device characterized by that. 請求項１において、前記大径段差部の内径面が、この大径段差部の奥側に位置する加締金型導入部と、この加締金型導入部から開口側へ大径となり前記加締部の内周に位置するテーパ状部分とでなる形状である車輪用軸受装置。   In Claim 1, the inner diameter surface of the large-diameter step portion has a large diameter from the crimping die introduction portion to the opening side and is positioned on the back side of the large-diameter step portion. A wheel bearing device having a shape including a tapered portion located on the inner periphery of the fastening portion. 請求項１または請求項２において、前記ハブ輪の前記加締部の硬度をＨＲＣ２８以下とした車輪用軸受装置。   The wheel bearing device according to claim 1 or 2, wherein a hardness of the caulking portion of the hub wheel is HRC28 or less. 請求項１ないし請求項３のいずれか１項に記載の車輪用軸受装置における前記加締部の加締加工方法であって、前記車輪用軸受装置における前記加締部は、加締加工前は内径面が前記大径段差部の一部となる円筒状部分とし、先端外周がテーパ状の押し当て面とされた加締金型の前記押当て面を前記円筒状部分の内周の開口縁に押し付けることにより、前記円筒状部分を拡径状態に加締めて前記加締部とする車輪用軸受装置の加締部の加締加工方法。   4. The method for caulking the caulking portion in the wheel bearing device according to claim 1, wherein the caulking portion in the wheel bearing device is prior to caulking. 5. The pressing surface of the clamping die whose inner diameter surface is a cylindrical portion that becomes a part of the large-diameter stepped portion and whose tip outer periphery is a tapered pressing surface is the opening edge of the inner periphery of the cylindrical portion. A method of caulking a caulking portion of a wheel bearing device, wherein the caulking portion is caulked to a diameter-enlarged state to be used as the caulking portion. 請求項４において、前記加締金型の前記押し当て面の面粗さを、Ｒａ１μｍ以下とした車輪用軸受装置の加締部の加締加工方法。   5. The method for caulking a caulking portion of a wheel bearing device according to claim 4, wherein a surface roughness of the pressing surface of the caulking die is Ra1 [mu] m or less.
JP2005205184A 2005-06-02 2005-07-14 Wheel bearing device and caulking method thereof Active JP4526455B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2005205184A JP4526455B2 (en) 2005-07-14 2005-07-14 Wheel bearing device and caulking method thereof
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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Application Number Priority Date Filing Date Title
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020110300A1 (en) * 2000-10-24 2002-08-15 Delphi Technologies, Inc. Self-retained wheel bearing assembly
JP2005233402A (en) * 2004-02-23 2005-09-02 Koyo Seiko Co Ltd Roller bearing device
JP2006112516A (en) * 2004-10-14 2006-04-27 Ntn Corp Bearing device for vehicle
JP2006161970A (en) * 2004-12-08 2006-06-22 Ntn Corp Wheel bearing device
JP2006161856A (en) * 2004-12-02 2006-06-22 Ntn Corp Wheel bearing device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020110300A1 (en) * 2000-10-24 2002-08-15 Delphi Technologies, Inc. Self-retained wheel bearing assembly
JP2005233402A (en) * 2004-02-23 2005-09-02 Koyo Seiko Co Ltd Roller bearing device
JP2006112516A (en) * 2004-10-14 2006-04-27 Ntn Corp Bearing device for vehicle
JP2006161856A (en) * 2004-12-02 2006-06-22 Ntn Corp Wheel bearing device
JP2006161970A (en) * 2004-12-08 2006-06-22 Ntn Corp Wheel bearing device

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