JP2008223840A - Device and method for manufacturing hub unit for supporting drive wheel - Google Patents

Device and method for manufacturing hub unit for supporting drive wheel Download PDF

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Publication number
JP2008223840A
JP2008223840A JP2007061166A JP2007061166A JP2008223840A JP 2008223840 A JP2008223840 A JP 2008223840A JP 2007061166 A JP2007061166 A JP 2007061166A JP 2007061166 A JP2007061166 A JP 2007061166A JP 2008223840 A JP2008223840 A JP 2008223840A
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Prior art keywords
inner ring
hub
pressing
inner end
caulking
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Japanese (ja)
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Shinji Hirakata
伸治 平方
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NSK Ltd
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NSK Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/186—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C43/00—Assembling bearings
    • F16C43/04—Assembling rolling-contact bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

Abstract

<P>PROBLEM TO BE SOLVED: To construct a manufacturing device capable of applying sufficient axial force on an inner ring 3 constructing a hub unit for supporting a drive wheel in a small size. <P>SOLUTION: A pressing die 22 for pressing a cylinder part 13 to form a caulking part is provide with a working surface part 24 butting on the cylinder part 13 and plastically deforming the cylinder part 13 radial direction outward. A pressing surface part 25 butting on an inner end surface 16 of an inner ring 3 with accompanying progress of plastic deformation and pressing the inner end surface 16 of the inner ring 3 in an axial direction is provided at a radial direction outer side of the working surface part 24. When the caulking part is formed, the pressing surface part 25 is butted on the inner end surface 16 of the inner ring 3 in accompanied with progress of plastic deformation and presses the inner ring in the axial direction to form the caulking part. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

この発明は、自動車の駆動輪（ＦＦ車の前輪、ＦＲ車及びＲＲ車の後輪、４ＷＤ車の全車輪）を懸架装置に対して回転自在に支持すると共に、上記駆動輪を回転駆動する為に利用する、駆動輪支持用ハブユニットの製造方法及び製造装置に関する。   The present invention supports the driving wheels of an automobile (front wheels of FF vehicles, rear wheels of FR vehicles and RR vehicles, all wheels of 4WD vehicles) rotatably with respect to a suspension system, and rotationally drives the driving wheels. The present invention relates to a manufacturing method and a manufacturing apparatus of a hub unit for driving wheel support used in the above.

自動車の駆動輪は、駆動輪支持用ハブユニットにより懸架装置に支持する。図４は、この様な駆動輪支持用ハブユニットのうち、特許文献１に記載された構造を示している。この駆動輪支持用ハブユニットは、外輪１の内径側にハブ２及び内輪３を、複数個の転動体４、４を介して回転自在に支持している。このうちの外輪１は、懸架装置を構成する図示しないナックルに結合固定した状態で、使用時にも回転しない。又、上記外輪１の内周面には第一、第二の外輪軌道５、６を設けて、この外輪１の内径側に上記ハブ２及び内輪３を、この外輪１と同心に、回転自在に支持している。   The driving wheel of the automobile is supported on the suspension device by a driving wheel supporting hub unit. FIG. 4 shows the structure described in Patent Document 1 among such driving wheel supporting hub units. This drive wheel support hub unit rotatably supports a hub 2 and an inner ring 3 on the inner diameter side of an outer ring 1 via a plurality of rolling elements 4 and 4. Out of these, the outer ring 1 is coupled and fixed to a knuckle (not shown) constituting the suspension device, and does not rotate during use. Further, first and second outer ring raceways 5 and 6 are provided on the inner peripheral surface of the outer ring 1, and the hub 2 and the inner ring 3 are rotatable on the inner diameter side of the outer ring 1 so as to be concentric with the outer ring 1. I support it.

上記ハブ２は、外周面の外端（軸方向に関して「外」とは、自動車への組み付け状態で車両の幅方向外側を言い、図１、２、４、５の左側、図６の下側。反対に、車両の幅方向中央側となる、図１、２、４、５の右側、図６の上側を、軸方向に関して「内」と言う。本明細書及び特許請求の範囲の全体で同じ。）寄り部分に、車輪を支持固定する為の取付フランジ７を、同じく中間部に第一の内輪軌道８を、同じく内端部に、この第一の内輪軌道８を形成した部分よりも外径寸法が小さくなった小径段部１０を、中心部にスプライン孔１１を、それぞれ設けている。そして、上記小径段部１０に、その外周面に第二の内輪軌道９を形成した上記内輪３を外嵌している。   The hub 2 is the outer end of the outer peripheral surface ("outside" with respect to the axial direction means the outside in the width direction of the vehicle in the assembled state to the automobile, left side of FIGS. 1, 2, 4, 5 and the lower side of FIG. On the other hand, the right side of Fig. 1, 2, 4, 5 and the upper side of Fig. 6, which is the central side in the width direction of the vehicle, are referred to as "inside" with respect to the axial direction. Same as above) The mounting flange 7 for supporting and fixing the wheel at the side portion, the first inner ring raceway 8 at the middle portion, and the portion where the first inner ring raceway 8 is formed at the inner end portion. A small-diameter step portion 10 having a reduced outer diameter and a spline hole 11 at the center are provided. And the said inner ring | wheel 3 which formed the 2nd inner ring raceway 9 in the outer peripheral surface is externally fitted to the said small diameter step part 10. As shown in FIG.

又、この内輪３の内周面の内端部に、中間部乃至外端部よりも内径寸法が大きくなった大径段部１２を設けている。そして、上記ハブ２の内端部に設けた円筒部１３の内端部を径方向外方に塑性変形させてかしめ部１４を形成すると共に、このかしめ部１４により上記大径段部１２の段差面１５を抑え付けている。これにより、上記内輪３を上記ハブ２に、この内輪３の軸方向両端部をこのハブ２の段差面２６と上記かしめ部１４とにより挟持した状態で、結合固定している。尚、上述の様に円筒部１３の内端部を径方向外方に塑性変形させる作業を従来は、揺動プレスにより行なっている。又、この状態で、上記内輪３の内端面１６は、上記かしめ部１４よりも軸方向内方に突出している。又、上記第一、第二の外輪軌道５、６と上記第一、第二の内輪軌道８、９との間に転動体４、４を、それぞれ複数個ずつ転動自在に設けている。   Further, a large-diameter step portion 12 having an inner diameter larger than that of the intermediate portion or the outer end portion is provided at the inner end portion of the inner peripheral surface of the inner ring 3. Then, the inner end portion of the cylindrical portion 13 provided at the inner end portion of the hub 2 is plastically deformed radially outward to form a caulking portion 14, and the caulking portion 14 forms a step of the large diameter step portion 12. The surface 15 is held down. As a result, the inner ring 3 is coupled and fixed to the hub 2 with both axial ends of the inner ring 3 being sandwiched between the stepped surface 26 of the hub 2 and the caulking portion 14. As described above, the operation of plastically deforming the inner end portion of the cylindrical portion 13 radially outward is conventionally performed by a rocking press. In this state, the inner end surface 16 of the inner ring 3 protrudes inward in the axial direction from the caulking portion 14. A plurality of rolling elements 4, 4 are provided between the first and second outer ring raceways 5 and 6 and the first and second inner ring raceways 8 and 9, respectively, so as to be freely rollable.

上述した様な駆動輪支持用ハブユニットを自動車に組み付ける場合には、図示の様に、等速ジョイント用外輪１７の外端面１８の中央部に固設したスプライン軸１９（駆動軸）を、上記ハブ２のスプライン孔１１にスプライン係合させる。これと共に、上記等速ジョイント用外輪１７の外端面１８の径方向外端部を、上記内輪３の内端面１６に当接させる。そして、この状態で、上記スプライン軸１９の先端部にナット２０を螺合し、更に緊締する事により、上記ハブ２及び内輪３と上記スプライン軸１９とを結合する。この様な従来構造の場合、上記かしめ部１４の内端面は、上記等速ジョイント用外輪１７の外端面１８に当接させない。この為、このかしめ部１４の内端面を、中心軸に対して直角な平面に仕上げる必要はない。一方、上記等速ジョイント用外輪１７の外端面１８に当接させる、上記内輪３の内端面１６は、元々中心軸に対して直角な平面である。この為、ハブユニットの組立後に、改めて上記内端面１６に平面加工を施す必要はない。従って、この様な平面加工を省略できる分、駆動輪支持用ハブユニットの製造コストの低減を図れる。   When the hub unit for driving wheel support as described above is assembled to an automobile, a spline shaft 19 (drive shaft) fixed at the center of the outer end surface 18 of the outer ring 17 for constant velocity joint is used as shown in the figure. The spline is engaged with the spline hole 11 of the hub 2. At the same time, the radially outer end of the outer end face 18 of the constant velocity joint outer ring 17 is brought into contact with the inner end face 16 of the inner ring 3. In this state, the hub 20 and the inner ring 3 are coupled to the spline shaft 19 by screwing the nut 20 into the tip of the spline shaft 19 and further tightening. In the case of such a conventional structure, the inner end face of the caulking portion 14 is not brought into contact with the outer end face 18 of the constant velocity joint outer ring 17. For this reason, it is not necessary to finish the inner end face of the caulking portion 14 to a plane perpendicular to the central axis. On the other hand, the inner end surface 16 of the inner ring 3 that is brought into contact with the outer end surface 18 of the constant velocity joint outer ring 17 is originally a plane perpendicular to the central axis. For this reason, after the hub unit is assembled, there is no need to re-plan the inner end face 16 again. Therefore, the manufacturing cost of the drive wheel supporting hub unit can be reduced by the amount that such planar processing can be omitted.

ところで、上述の様な内輪３の内端部をかしめ部１４により抑え付ける事で、この内輪３をハブ２に結合固定する構造の場合、この内輪３がハブ２に対して相対回転（クリープ）するのを防止する事が、耐久性確保等の面から重要になる。この様なクリープを防止する為に、特許文献２には、内輪の内端面でかしめ部と当接する部分に、この内端面から凹入する状態で凹部を設け、この凹部に上記かしめ部の一部を凹凸係合させる技術が記載されている。この様な技術を採用すれば、上記かしめ部により上記内輪を軸方向に抑え付ける力、即ち、この内輪に加わる軸力｛内輪の外端面とこの外端面に当接する段差面との間（当接部）に加わる軸方向の力｝が小さくても、上記内輪が上記ハブに対して相対回転する事を防止できる。但し、上記内輪に凹部を設ける為、この内輪の加工工程が増え、その分製造コストが増大する可能性がある。又、上記かしめ部を円周方向に関して均一に形成できない可能性もあり、内輪が軸方向にがたつき易くなる可能性や、耐久性を確保しにくくなる可能性もある。   By the way, in the case where the inner ring 3 is restrained by the caulking part 14 as described above, the inner ring 3 is relatively rotated (creep) with respect to the hub 2 in a structure in which the inner ring 3 is coupled and fixed to the hub 2. It is important to prevent this from the standpoint of ensuring durability. In order to prevent such creep, Patent Document 2 discloses that a concave portion is provided in a portion in contact with the caulking portion on the inner end surface of the inner ring so as to be recessed from the inner end surface. A technique for engaging the concave and convex portions is described. If such a technique is adopted, the force that holds the inner ring in the axial direction by the caulking portion, that is, the axial force applied to the inner ring {between the outer end surface of the inner ring and the step surface that contacts the outer end surface (the Even if the axial force applied to the contact portion is small, the inner ring can be prevented from rotating relative to the hub. However, since the concave portion is provided in the inner ring, the number of processing steps for the inner ring increases, and the manufacturing cost may increase accordingly. In addition, the caulking portion may not be formed uniformly in the circumferential direction, and the inner ring may be likely to rattle in the axial direction, and durability may be difficult to ensure.

一方、特許文献３には、従動輪支持用ハブユニットで、ハブの内端部に設けた円筒部を径方向外方に塑性変形させてかしめ部を形成する際に、円環状の抑え治具により内輪の内端部外周縁を拘束した状態で、このかしめ部を揺動かしめにより形成する技術が記載されている。この様な技術を採用すれば、かしめ部を形成する際に内輪が不正に変形する（歪む）のを防止すると共に、このかしめ部の形成後にこの内輪の軸力を確保して、クリープ防止を図れると考えられる。但し、この特許文献３に記載された技術を、前述の図４に示した様な駆動輪支持用ハブユニットにそのまま適用しただけでは、内輪３の軸力を十分に確保できない可能性がある事が、本発明者の研究により分かった。   On the other hand, in Patent Document 3, an annular holding jig is used when a caulking portion is formed by plastically deforming a cylindrical portion provided at an inner end portion of a hub radially outward in a hub unit for supporting a driven wheel. Describes a technique in which the caulking portion is formed by swing caulking in a state where the outer peripheral edge of the inner end portion of the inner ring is restrained. If such a technique is adopted, the inner ring is prevented from being deformed (distorted) illegally when the caulking portion is formed, and the axial force of the inner ring is secured after the caulking portion is formed, thereby preventing creep. It is thought that it can plan. However, there is a possibility that the axial force of the inner ring 3 cannot be sufficiently secured only by applying the technique described in Patent Document 3 as it is to the driving wheel supporting hub unit as shown in FIG. However, it became clear by research of this inventor.

即ち、前述の図４に示した様な駆動輪支持用ハブユニットの場合、内輪３の内端面１６を等速ジョイント用外輪１７の外端面１８に当接させるべく、この内輪３の内端面１６をかしめ部１４の内端面よりも軸方向内方に突出させている。言い換えれば、このかしめ部１４を、この内輪３の内端面１６から軸方向内方に突出させていない。この為、このかしめ部１４の寸法（容積）が、例えば次述する図５に示す様な、かしめ部１４ａを内輪３ａの内端面１６ａよりも突出させた構造（駆動輪支持用ハブユニット、従動輪支持用ハブユニットを問わない）に比べて、小さくなる。   That is, in the case of the driving wheel supporting hub unit as shown in FIG. 4, the inner end surface 16 of the inner ring 3 is brought into contact with the outer end surface 18 of the outer ring 17 for the constant velocity joint. The caulking portion 14 protrudes inward in the axial direction from the inner end surface of the caulking portion 14. In other words, the caulking portion 14 is not protruded inward in the axial direction from the inner end surface 16 of the inner ring 3. For this reason, the size (volume) of the caulking portion 14 has a structure in which the caulking portion 14a protrudes from the inner end surface 16a of the inner ring 3a as shown in FIG. It is smaller than a hub unit for supporting a driving wheel).

一方、かしめ部の形成時は、図５の（Ａ）に示す様に、ハブ２ａの内端部に設けた円筒部１３ａが径方向外方に塑性変形しつつ、このハブ２ａの小径段部１０並びに内輪３ａが軸方向に圧縮され、これら小径段部１０並びに内輪３ａが、軸方向寸法が小さくなる方向に弾性変形する。そして、上記かしめ部１４ａが形成された状態で、図５の（Ｂ）に示す様に、上記小径段部１０並びに内輪３ａに、上記弾性変形に基づく反力（スプリングバック）を生じる。この場合に、上記内輪３ａの弾性変形量が大きい程、この内輪３ａの反力が上記小径段部１０の反力よりも大きくなり、この内輪３ａの軸力を大きくできる。   On the other hand, when the caulking portion is formed, as shown in FIG. 5A, the cylindrical portion 13a provided at the inner end portion of the hub 2a is plastically deformed radially outward, and the small-diameter step portion of the hub 2a. 10 and the inner ring 3a are compressed in the axial direction, and the small diameter step portion 10 and the inner ring 3a are elastically deformed in a direction in which the axial dimension is reduced. Then, in the state where the caulking portion 14a is formed, as shown in FIG. 5B, a reaction force (spring back) based on the elastic deformation is generated in the small-diameter step portion 10 and the inner ring 3a. In this case, the larger the amount of elastic deformation of the inner ring 3a, the larger the reaction force of the inner ring 3a becomes than the reaction force of the small-diameter step portion 10, and the axial force of the inner ring 3a can be increased.

上述の図５は、かしめ部１４ａを内輪３ａの内端面１６ａよりも突出させた構造、即ち、前述の図４に示した構造に比べてかしめ部１４ａの寸法が大きくなる構造を示している。この図５に示した様な、かしめ部１４ａの寸法（容積）が大きくなる構造の場合には、このかしめ部１４ａの形成時に、このかしめ部１４ａを形成する為の大きな荷重（加工荷重）が、上記内輪３ａにも加わり（内輪３ａに大きな圧縮力が加わり）、この内輪３ａを軸方向に大きく弾性変形させられる。この為、この弾性変形に基づく上記内輪３ａの反力を、上記小径段部１０の反力よりも大きくし易く、上記軸力を確保し易い。これに対して、前述の図４に示した様な駆動輪支持用ハブユニットの場合には、かしめ部１４の寸法（容積）が小さい為、このかしめ部１４を形成する為の荷重（加工荷重）も小さくなる。即ち、このかしめ部１４で亀裂等の損傷を防止し、必要な耐久性を確保する為に、上記荷重（加工荷重）を、上記図５に示した様なかしめ部１４ａを形成する場合に比べ、大きくできない。そして、前記特許文献３に記載された様な抑え治具により内輪３を拘束したとしても、この内輪３を抑え付ける位置によっては、即ち、この内輪３の内端部外周縁を拘束しても、この内輪３ａの弾性変形量（軸方向圧縮量）を十分に大きくできず、上記軸力を十分に確保できない可能性がある。   FIG. 5 described above shows a structure in which the caulking portion 14a protrudes from the inner end surface 16a of the inner ring 3a, that is, a structure in which the size of the caulking portion 14a is larger than the structure shown in FIG. In the case of a structure in which the size (volume) of the caulking portion 14a is large as shown in FIG. 5, a large load (working load) for forming the caulking portion 14a is formed when the caulking portion 14a is formed. The inner ring 3a is also applied (a large compressive force is applied to the inner ring 3a), and the inner ring 3a is greatly elastically deformed in the axial direction. For this reason, it is easy to make the reaction force of the inner ring 3a based on this elastic deformation larger than the reaction force of the small-diameter step portion 10, and to ensure the axial force. On the other hand, in the case of the hub unit for driving wheel support as shown in FIG. 4 described above, since the size (volume) of the caulking portion 14 is small, the load (working load) for forming the caulking portion 14 is small. ) Also becomes smaller. That is, in order to prevent damage such as cracks in the caulking portion 14 and ensure the necessary durability, the load (working load) is compared with the case where the caulking portion 14a as shown in FIG. 5 is formed. I ca n’t make it bigger. Even if the inner ring 3 is restrained by a restraining jig as described in Patent Document 3, depending on the position at which the inner ring 3 is restrained, that is, the inner peripheral edge of the inner ring 3 may be restrained. The elastic deformation amount (axial compression amount) of the inner ring 3a cannot be sufficiently increased, and the axial force may not be sufficiently ensured.

又、上記特許文献３に記載された技術の場合、かしめ部を揺動かしめにより形成する。この様な揺動かしめによりかしめ部を形成する場合、図６（Ａ）に示す様に、押型２１の一部を、円筒部１３ａの内端縁部の円周方向一部分に押し当てた状態で、この押型２１をハブ２ａに対し揺動させる。そして、上記円筒部１３ａの内端縁部に対する押し当て位置を円周方向に移動させながら、この円筒部１３ａを円周方向に亙り連続的に径方向外方に塑性変形させる。この様に円筒部１３ａを塑性変形させる際、図６（Ｂ）に矢印α、αで示す様に、上記円筒部１３ａのうちで上記押型２１が押し当てられた部分の一部が、円周方向に逃げる傾向となる。そして、この様な逃げに伴って、上記内輪３ａに加わる軸方向の荷重（圧縮力）が（上記矢印α、α分）小さくなる可能性がある。   In the case of the technique described in Patent Document 3, the caulking portion is formed by swing caulking. When the caulking portion is formed by such oscillating caulking, as shown in FIG. 6A, a part of the pressing die 21 is pressed against a part of the inner end edge of the cylindrical portion 13a in the circumferential direction. The pressing die 21 is swung with respect to the hub 2a. Then, the cylindrical portion 13a is continuously plastically deformed radially outward over the circumferential direction while moving the pressing position against the inner edge of the cylindrical portion 13a in the circumferential direction. When the cylindrical portion 13a is plastically deformed in this way, as shown by arrows α and α in FIG. 6B, a part of the cylindrical portion 13a to which the pressing die 21 is pressed is It tends to escape in the direction. With such escape, the axial load (compressive force) applied to the inner ring 3a may be reduced (indicated by the arrows α and α).

上述の図６に示した構造も、かしめ部１４ａを内輪３ａの内端面１６ａよりも突出させた構造であり、このかしめ部１４ａを形成する為の荷重（加工荷重）は大きい。この為、上述の様な逃げに基づいて上記内輪３ａに加わる軸方向の荷重（圧縮力）が小さくなっても、その影響は相対的に小さく、この内輪３ａは十分に弾性変形する（軸力を確保できる）。これに対し、前述の図４に示した様な駆動輪支持用ハブユニットの場合には、上述した様に、かしめ部１４を形成する為の荷重（加工荷重）が小さくなる（かしめ部の耐久性を確保する面から大きくできない）。そして、上述の様な逃げに基づき内輪３ａに加わる軸方向の荷重（圧縮力）が小さくなると、その影響は相対的に大きくなり、その分この内輪３ａの弾性変形量が小さくなる程度が著しくなる。この為、この面からも、軸力を確保しにくくなる可能性がある。   The above-described structure shown in FIG. 6 is also a structure in which the caulking portion 14a is protruded from the inner end surface 16a of the inner ring 3a, and a load (processing load) for forming the caulking portion 14a is large. For this reason, even if the axial load (compression force) applied to the inner ring 3a is reduced based on the above-described relief, the influence is relatively small, and the inner ring 3a is sufficiently elastically deformed (axial force). Can be secured). On the other hand, in the case of the driving wheel supporting hub unit as shown in FIG. 4 described above, as described above, the load (working load) for forming the caulking portion 14 becomes small (durability of the caulking portion). Can not be large from the aspect of securing the sex). When the axial load (compressive force) applied to the inner ring 3a is reduced due to the above-described relief, the influence becomes relatively large, and the extent to which the elastic deformation amount of the inner ring 3a is reduced correspondingly. . For this reason, it may be difficult to ensure the axial force from this aspect as well.

又、上述の様な特許文献３に記載された技術の場合、かしめ部を形成する為の装置が大型化する可能性がある。即ち、前述した様に、内輪を抑え付ける為の抑え治具は、この内輪の内端部外周縁を抑え付ける。この為、この抑え治具の径方向寸法が大きくなり、その分、上記装置の径方向寸法が大型化する可能性がある。この様な装置の大型化は、大きな設置スペースを必要とする等、好ましくない。   Further, in the case of the technique described in Patent Document 3 as described above, there is a possibility that the apparatus for forming the caulking portion is increased in size. That is, as described above, the restraining jig for restraining the inner ring restrains the outer peripheral edge of the inner end portion of the inner ring. For this reason, the radial dimension of the holding jig is increased, and the radial dimension of the apparatus may be increased correspondingly. Such an increase in size of the apparatus is not preferable because a large installation space is required.

特開平９−１６４８０３号公報JP-A-9-164803 特開２００６−１４４９９０号公報JP 2006-144990 A 特開２０００−３１７５５２号公報JP 2000-317552 A

本発明の駆動輪支持用ハブユニットの製造方法及び製造装置は、上述した様な不都合を解消すべく発明したものである。   The drive wheel support hub unit manufacturing method and manufacturing apparatus according to the present invention have been invented to eliminate the above-mentioned disadvantages.

本発明の対象となる駆動輪支持用ハブユニットは、ハブと、内輪と、外輪と、複数個の転動体とを備える。
このうちのハブは、外周面の外端寄り部分に車輪を支持する為のフランジを、同じく中間部に第一の内輪軌道を、同じく内端部にこの第一の内輪軌道を形成した部分よりも外径寸法が小さくなった小径段部を、それぞれ形成している。
又、上記内輪は、上記小径段部に外嵌されたもので、外周面に第二の内輪軌道を形成している。
又、上記外輪は、内周面に、上記第一の内輪軌道に対向する第一の外輪軌道及び上記第二の内輪軌道に対向する第二の外輪軌道を形成している。
又、上記各転動体は、上記第一、第二の内輪軌道と上記第一、第二の外輪軌道との間に、それぞれ複数個ずつ設けられている。
更に、上記内輪の内周面の内端部に、この内周面の中間部よりも内径寸法が大きくなった大径段部又は軸方向内方に向かう程内径寸法が大きくなる方向に傾斜した傾斜面部を設けている。そして、上記中間部とこの大径段部との間に存在する段差面又は上記傾斜面部を、上記ハブの内端部に設けた円筒部を径方向外方に塑性変形させて形成したかしめ部により抑え付ける事で、上記内輪を上記ハブに結合固定している。これと共に、上記内輪の内端面を、上記かしめ部の内端面よりも軸方向内方に突出させている。 A drive wheel support hub unit that is a subject of the present invention includes a hub, an inner ring, an outer ring, and a plurality of rolling elements.
Of these, the hub has a flange for supporting the wheel on the outer end portion of the outer peripheral surface, the first inner ring raceway in the middle portion, and the first inner ring raceway in the inner end portion. Are formed with small-diameter steps each having a small outer diameter.
The inner ring is externally fitted to the small-diameter step, and forms a second inner ring raceway on the outer peripheral surface.
Further, the outer ring forms a first outer ring track facing the first inner ring track and a second outer ring track facing the second inner ring track on the inner peripheral surface.
Each of the rolling elements is provided in plural between the first and second inner ring raceways and the first and second outer ring raceways.
Further, the inner end of the inner peripheral surface of the inner ring is inclined in a direction in which the inner diameter becomes larger as it goes inward in the axial direction or a large-diameter step portion having an inner diameter larger than the intermediate portion of the inner peripheral surface. An inclined surface portion is provided. Further, the stepped surface or the inclined surface portion existing between the intermediate portion and the large-diameter stepped portion is formed by plastically deforming a cylindrical portion provided at the inner end portion of the hub radially outward. The inner ring is coupled and fixed to the hub. At the same time, the inner end surface of the inner ring protrudes inward in the axial direction from the inner end surface of the caulking portion.

特に、請求項１に記載した本発明の駆動輪支持用ハブユニットの製造方法に於いては、上記円筒部を径方向外方に塑性変形させて上記かしめ部を形成する際に、この円筒部を抑え付けてこのかしめ部を形成する為の押型の一部を、上記塑性変形の進行に伴い上記内輪の内端面に当接させ、この内輪を軸方向に抑え付けつつ、上記かしめ部を形成する。
尚、請求項２に記載した様に、上記押型と別体に設けた押圧部材を、内輪の内端面に当接させ、この内輪を軸方向に抑え付けつつ、上記押型によりかしめ部を形成する事もできる。 In particular, in the method for manufacturing a driving wheel supporting hub unit according to the first aspect of the present invention, the cylindrical portion is formed when the cylindrical portion is plastically deformed radially outward to form the crimped portion. A part of the pressing die for forming the caulking portion is held in contact with the inner end surface of the inner ring as the plastic deformation proceeds, and the caulking portion is formed while holding the inner ring in the axial direction. To do.
In addition, as described in claim 2, a pressing member provided separately from the pressing mold is brought into contact with the inner end surface of the inner ring, and the inner ring is pressed in the axial direction, and the crimping portion is formed by the pressing mold. You can also do things.

又、本発明の駆動輪支持用ハブユニットの製造方法を実施する場合により好ましくは、押型の一部に設けた円環状の加工面部を円筒部の内端縁部に全周に亙り押し当てたまま、この押型をハブに対し揺動させる事なく、この押型をこのハブに向け軸方向に押圧する事により、上記円筒部を全周に亙り同時に、上記加工面部に沿って径方向外方に塑性変形させる（平押しかしめによりかしめ部を形成する）。
又、更に好ましくは、請求項４に記載した様に、内輪の内端面のうち、段差面又は傾斜面部よりも径方向外側部分で、且つ、この外側部分の径方向中間部よりも内径側を抑え付けつつ、かしめ部を形成する。 More preferably, when the method for manufacturing a hub unit for driving wheel support of the present invention is carried out, an annular processing surface portion provided in a part of the pressing die is pressed against the inner end edge portion of the cylindrical portion over the entire circumference. Without pushing the stamp with respect to the hub, by pressing the stamp toward the hub in the axial direction, the cylindrical portion is spread over the entire circumference and simultaneously radially outward along the machining surface portion. It is plastically deformed (a caulking part is formed by flat pushing butting).
More preferably, as described in claim 4, the inner end surface of the inner ring is located on the radially outer side of the stepped surface or the inclined surface portion and on the inner diameter side of the radially intermediate portion of the outer portion. A caulking portion is formed while holding down.

又、請求項５に記載した駆動輪支持用ハブユニットの製造装置は、上述の様な駆動輪支持用ハブユニットを造る為、上記ハブを支持する為の支持手段と、上記円筒部を抑え付けて上記かしめ部を形成する為の押型と、この押型を押圧する為の押圧手段とを備える。
特に、本発明の駆動輪支持用ハブユニットの製造装置に於いては、上記押型を、上記円筒部と当接してこの円筒部を径方向外方に塑性変形させる加工面部と、この塑性変形の際にこの塑性変形の進行に伴い上記内輪の内端面と当接して、この内輪を軸方向に抑え付ける抑え面部とを有するものとしている。
尚、請求項６に記載した様に、上記押型と別体に設けた押圧部材に、上記内輪の内端面と当接してこの内輪を軸方向に抑え付ける抑え面部を設ける事もできる。この場合に、上記押圧部材を、上記押型を押圧する為の押圧手段とは別の押圧手段により押圧する事もできる。 According to a fifth aspect of the present invention, there is provided a drive wheel support hub unit manufacturing apparatus that suppresses the support means for supporting the hub and the cylindrical portion in order to manufacture the drive wheel support hub unit as described above. And a pressing die for forming the caulking portion and a pressing means for pressing the pressing die.
In particular, in the apparatus for manufacturing a hub unit for driving wheel support according to the present invention, the stamping die is brought into contact with the cylindrical portion to plastically deform the cylindrical portion radially outward, and the plastic deformation At the same time, as the plastic deformation progresses, it has a restraining surface portion that abuts against the inner end face of the inner ring and restrains the inner ring in the axial direction.
According to the sixth aspect of the present invention, the pressing member provided separately from the pressing die may be provided with a holding surface portion that abuts the inner end surface of the inner ring and holds the inner ring in the axial direction. In this case, the pressing member can be pressed by a pressing means different from the pressing means for pressing the pressing die.

又、本発明の駆動輪支持用ハブユニットの製造装置を実施する場合により好ましくは、請求項７に記載した様に、押圧手段を、押型の加工面部を円筒部の内端縁部に全周に亙り押し当てたまま、この押型をハブに対し揺動させる事なく、この押型をこのハブに向け軸方向に押圧するものとする。そして、この押圧手段の押圧に基づいて、上記円筒部を全周に亙り同時に、上記加工面部に沿って径方向外方に塑性変形させる（平押しかしめによりかしめ部を形成する）。
又、更に好ましくは、請求項８に記載した様に、上記抑え面部を、内輪の内端面のうち、段差面又は傾斜面部よりも径方向外側部分で、且つ、この外側部分の径方向中間部よりも内径側を抑え付けるものとする。 More preferably, when the apparatus for manufacturing a hub unit for driving wheel support according to the present invention is implemented, the pressing means is arranged so that the processing surface portion of the pressing die is placed around the inner end edge portion of the cylindrical portion. The pressing die is pressed in the axial direction toward the hub without being swung with respect to the hub while being pressed against the hub. Then, based on the pressing of the pressing means, the cylindrical portion is simultaneously plastically deformed radially outward along the processed surface portion (a caulking portion is formed by flat pressing).
More preferably, as described in claim 8, the restraining surface portion is a radially outer portion of the inner end surface of the inner ring with respect to the stepped surface or the inclined surface portion, and a radially intermediate portion of the outer portion. The inner diameter side should be suppressed.

上述の様に、本発明の駆動輪支持用ハブユニットの製造方法及び製造装置の場合には、かしめ部を形成する為の押型の一部を内輪の内端面に当接させ、この内輪を軸方向に抑え付けつつ上記かしめ部を形成する。従って、前述の特許文献３に記載された様な、内輪の内端部外周縁を抑え付ける為の抑え治具を必要とせず、装置の径方向寸法の大型化を防止できる。しかも、この場合に、請求項４、８に記載した様に、内輪の内端面のうち、段差面又は傾斜面部よりも径方向外側部分で、且つ、この外側部分の径方向中間部よりも内径側を抑え付ければ、上記押型の径方向寸法を小さくできる（更なる装置の大型化の防止を図れる）他、内輪のクリープを防止する為の軸力｛内輪の外端面とこの外端面に当接する段差面との間（当接部）に加わる軸方向の力｝を十分に確保できる。   As described above, in the manufacturing method and the manufacturing apparatus of the driving wheel supporting hub unit of the present invention, a part of the pressing die for forming the caulking portion is brought into contact with the inner end surface of the inner ring, and the inner ring is pivoted. The caulking portion is formed while restraining in the direction. Therefore, a restraining jig for restraining the outer peripheral edge of the inner end of the inner ring as described in Patent Document 3 is not required, and an increase in the radial dimension of the apparatus can be prevented. Moreover, in this case, as described in claims 4 and 8, the inner end surface of the inner ring is an outer portion in the radial direction from the stepped surface or the inclined surface portion, and an inner diameter from the radial intermediate portion of the outer portion. If the side is held down, the radial dimension of the die can be reduced (to prevent further increase in the size of the device), and the axial force to prevent creep of the inner ring {applies to the outer end surface of the inner ring and the outer end surface. A sufficient axial force} between the contacted step surfaces (contact portion) can be ensured.

即ち、前述の特許文献３に記載されている技術の様に、内輪の内端部外周縁を抑え治具により拘束する場合には、この内輪を拘束する部分が、この内輪のうちでハブの段差面とかしめ部とにより軸方向に挟持される部分から、径方向に外れる量が大きくなる。この場合に、この内輪の挟持される部分の軸方向に関する弾性変形量（軸方向圧縮量）が、上記軸力の大きさに対応する（弾性変形量が大きい程軸力も大きくなる）が、上述の様に段差面とかしめ部とにより挟持される部分と、上記抑え治具により拘束される部分とが、径方向に関して大きくずれると、必要とする弾性変形量（圧縮量）、延いては、上記軸力を確保しにくくなる。   That is, as in the technique described in Patent Document 3 described above, when the outer peripheral edge of the inner end of the inner ring is restrained by a jig, the portion that restrains the inner ring is the hub of the inner ring. The amount of detachment in the radial direction from the portion sandwiched in the axial direction by the stepped surface and the caulking portion increases. In this case, the elastic deformation amount (axial compression amount) in the axial direction of the portion where the inner ring is sandwiched corresponds to the magnitude of the axial force (the larger the elastic deformation amount, the greater the axial force). If the portion sandwiched between the stepped surface and the caulking portion and the portion restrained by the restraining jig greatly deviate in the radial direction, the required amount of elastic deformation (compression amount), It becomes difficult to ensure the axial force.

しかも、本発明が対象とする、内輪の内端面をかしめ部の内端面よりも軸方向内方に突出させる構造の場合には、前述した様に、かしめ部の寸法が小さくなる分、このかしめ部を形成する為の荷重（加工荷重）を大きくできず、この面からも、上記軸力を確保しにくくなる。これに対して、上述の様に内輪の内端面の内径側を抑え付ければ、この内輪を抑え付ける部分と上記段差面とかしめ部とにより挟持される部分とを近く（径方向に関するずれを小さく）できる。この為、上記かしめ部形成する為の荷重（加工荷重）を大きくできなくても、上記挟持される部分の弾性変形量を大きくでき、上記軸力を十分に確保できる。   Moreover, in the case of the structure in which the inner end surface of the inner ring is projected inward in the axial direction from the inner end surface of the caulking portion, which is the subject of the present invention, as described above, the caulking portion is reduced in size. The load (working load) for forming the portion cannot be increased, and it is difficult to secure the axial force from this surface. On the other hand, if the inner diameter side of the inner end surface of the inner ring is suppressed as described above, the portion that suppresses the inner ring and the portion that is sandwiched between the stepped surface and the caulking portion are close (the displacement in the radial direction is reduced). )it can. For this reason, even if the load (working load) for forming the caulking portion cannot be increased, the elastic deformation amount of the sandwiched portion can be increased, and the axial force can be sufficiently secured.

又、請求項３、７に記載した様に、かしめ部を平押しかしめにより形成すれば、揺動かしめの様な、かしめ部の形成の際に円筒部に逃げを生じる事がない。この為、この様な逃げに伴う、上記内輪に加わる軸方向の荷重（圧縮力）の低減を防止でき、この内輪（のうちでハブの段差面とかしめ部とにより軸方向に挟持される部分）の弾性変形量（圧縮量）、延いては、上記軸力を十分に確保できる。
尚、製造装置の小型化の要請が低ければ、請求項２、６に記載した様に、押型と別体に設けた押圧部材を内輪に当接させる事もできる。この場合にも、上述の様に内輪の内端面の内径側を抑え付けたり、平押しかしめによりかしめ部を形成すれば、このかしめ部形成する為の荷重（加工荷重）を大きくできなくても、上記内輪（のうちでハブの段差面とかしめ部とにより軸方向に挟持される部分）の弾性変形量を大きくでき、上記軸力を十分に確保できる。 In addition, if the caulking portion is formed by flat pressing as described in claims 3 and 7, the cylindrical portion will not escape when the caulking portion is formed, such as swing caulking. For this reason, it is possible to prevent a reduction in the axial load (compression force) applied to the inner ring due to such escape, and the inner ring (of which the portion sandwiched in the axial direction by the stepped surface of the hub and the caulking portion) ) Elastic deformation amount (compression amount), that is, the axial force can be sufficiently secured.
If the demand for downsizing of the manufacturing apparatus is low, a pressing member provided separately from the pressing die can be brought into contact with the inner ring as described in claims 2 and 6. Even in this case, as described above, if the inner diameter side of the inner end surface of the inner ring is pressed down or a caulking portion is formed by flat pressing, even if the load (working load) for forming the caulking portion cannot be increased. The amount of elastic deformation of the inner ring (among the portion sandwiched in the axial direction by the stepped surface and the caulking portion of the hub) can be increased, and the axial force can be sufficiently secured.

図１〜２は、本発明の実施の形態の１例を示している。尚、本例の特徴は、かしめ部１４の形成方法、及び、このかしめ部１４を形成する為の押型２２の形状を工夫する事により、駆動輪支持用ハブユニットを構成する内輪３に十分な軸力を付与する事と、製造装置を小型に構成する事との両立を図る点にある。対象となる駆動輪支持用ハブユニットの基本構造に関しては、前述の図４に示した従来構造と同様であるから、同等部分に関する図示並びに説明は省略若しくは簡略にし、以下、本例の特徴部分を中心に説明する。   1 and 2 show an example of an embodiment of the present invention. The feature of this example is that the method for forming the caulking portion 14 and the shape of the pressing die 22 for forming the caulking portion 14 are devised to be sufficient for the inner ring 3 constituting the driving wheel supporting hub unit. It is in the point which aims at coexistence with giving axial force and making a manufacturing apparatus small. Since the basic structure of the target drive wheel supporting hub unit is the same as that of the conventional structure shown in FIG. 4 described above, illustrations and explanations of equivalent parts are omitted or simplified. The explanation is centered.

本例の場合は、駆動輪支持用ハブユニットを造るべく、この駆動輪支持用ハブユニットを構成する、外輪１と、ハブ２と、内輪３と、複数個の転動体４、４（図４等参照）とを、所定の位置関係にそれぞれ組み立てる。この状態で、上記ハブ２の内端部に設けた円筒部１３の内端部は、図１の（Ａ）に示す様に、上記内輪３の内周面に設けた大径段部１２の段差面１５よりも、軸方向内方に突出する。そして、この様に組み立てた駆動輪支持用ハブユニットを、この駆動輪支持用ハブユニットの製造装置である、かしめ部形成装置２３にセットする。このかしめ部形成装置２３は、上記ハブ２を支持する為の、図示しない支持手段（例えば受台）と、上記円筒部１３を抑え付けて上記かしめ部１４を形成する為の押型２２と、この押型２２を押圧する為の、図示しない押圧手段（例えば油圧アクチュエータ）とを備える。   In the case of this example, in order to produce a driving wheel supporting hub unit, the outer ring 1, the hub 2, the inner ring 3, and a plurality of rolling elements 4, 4 (FIG. 4) constituting the driving wheel supporting hub unit. Etc.) are assembled in a predetermined positional relationship. In this state, the inner end portion of the cylindrical portion 13 provided at the inner end portion of the hub 2 is connected to the large-diameter step portion 12 provided on the inner peripheral surface of the inner ring 3 as shown in FIG. It protrudes inward in the axial direction from the step surface 15. Then, the drive wheel support hub unit assembled in this way is set in a caulking portion forming device 23 which is a manufacturing device of the drive wheel support hub unit. The caulking portion forming device 23 includes a supporting means (not shown) for supporting the hub 2, a pressing die 22 for pressing the cylindrical portion 13 to form the caulking portion 14, A pressing means (for example, a hydraulic actuator) (not shown) for pressing the pressing die 22 is provided.

この様なかしめ部形成装置２３（の支持手段）に、上記駆動輪支持用ハブユニットをセット（載置）したならば、図１の（Ａ）に示す様に、上記ハブ２の内端部に設けた円筒部１３の内端縁部に、上記押型２２の下端面（図１の左端面）に設けた円環状の加工面部２４を、全周に亙り軸方向に対向させる。この加工面部２４は、上記円筒部１３と当接してこの円筒部１３を径方向外方に塑性変形させるもので、完成後のかしめ部１４の内端面に合致する、円環状の凹曲面により構成している。この様な加工面部２４の表面には、必要に応じて、ダイヤモンドライクカーボン（ＤＬＣ）、Ti等の、摩擦係数が低い、超硬コーティング層を設ける。これにより、この加工面部２４の硬度を十分に確保すると共に、この加工面部２４の摩擦係数を十分に小さくする。   When the driving wheel supporting hub unit is set (placed) on such a caulking portion forming apparatus 23 (supporting means), as shown in FIG. An annular processing surface portion 24 provided on the lower end surface (left end surface in FIG. 1) of the pressing die 22 is opposed to the inner end edge portion of the cylindrical portion 13 provided in the axial direction over the entire circumference. The processed surface portion 24 abuts on the cylindrical portion 13 and plastically deforms the cylindrical portion 13 radially outward, and is constituted by an annular concave curved surface that matches the inner end surface of the crimped portion 14 after completion. is doing. A carbide coating layer having a low friction coefficient such as diamond-like carbon (DLC) or Ti is provided on the surface of the processed surface portion 24 as necessary. Thereby, while ensuring the hardness of this processed surface part 24 sufficiently, the friction coefficient of this processed surface part 24 is made small enough.

又、上記押型２２の下端面（図１の左端面）で、上記加工面部２４の周囲部分に、抑え面部２５を設けている。この抑え面部２５は、上記円筒部１３を塑性変形させる際に、この塑性変形の進行に伴い上記内輪３の内端面と当接して、この内輪３の内端面を軸方向に抑え付けるものである。この様な押型２２を用いる本例の場合には、上記円筒部１３を径方向外方に塑性変形させて上記かしめ部１４を形成する際に、上記押型２２の抑え面部２５を、上記塑性変形の進行に伴い上記内輪３の内端面１６に当接させ、この内輪３を軸方向に抑え付けつつ、上記かしめ部１４を形成する。   In addition, a pressing surface portion 25 is provided in a peripheral portion of the processing surface portion 24 at the lower end surface (left end surface in FIG. 1) of the pressing die 22. When the cylindrical portion 13 is plastically deformed, the restraining surface portion 25 comes into contact with the inner end surface of the inner ring 3 as the plastic deformation proceeds, and restrains the inner end surface of the inner ring 3 in the axial direction. . In the case of this example using such a pressing die 22, when the cylindrical portion 13 is plastically deformed radially outward to form the caulking portion 14, the pressing surface portion 25 of the pressing die 22 is subjected to the plastic deformation. As it advances, the caulking portion 14 is formed while abutting against the inner end face 16 of the inner ring 3 and pressing the inner ring 3 in the axial direction.

即ち、上述の様にかしめ部形成装置２３に駆動輪支持用ハブユニットをセットした状態で、上記押型２２を下方（図１の左方）に変位させ、上記円筒部１３の内端縁部に上記加工面部２４を、全周に亙り押し当てる。更に、この状態で、上記押型２２を前記ハブ２に対して揺動させる事なく（軸方向に直線的に）、この押型２２をこのハブ２に向け下方（図１の左方）に押圧する。これにより、図１の（Ｂ）に示す様に、上記円筒部１３を全周に亙り同時に、上記加工面部２４に沿って径方向外方に塑性変形させる。又、この塑性変形の進行に伴って、上記押型２２の抑え面部２５を、上記内輪３の内端面１６に当接させ、この抑え面部２５によりこの内輪３を軸方向に抑え付けつつ、上記円筒部１３を径方向外方に塑性変形させる。   That is, with the drive wheel support hub unit set in the caulking portion forming device 23 as described above, the pressing die 22 is displaced downward (leftward in FIG. 1), and the inner end edge of the cylindrical portion 13 is moved. The processed surface portion 24 is pressed around the entire circumference. Further, in this state, the pressing die 22 is pressed downward (to the left in FIG. 1) toward the hub 2 without swinging the pressing die 22 with respect to the hub 2 (linearly in the axial direction). . Thereby, as shown in FIG. 1B, the cylindrical portion 13 is simultaneously plastically deformed radially outward along the processed surface portion 24 over the entire circumference. Further, as the plastic deformation progresses, the holding surface portion 25 of the pressing die 22 is brought into contact with the inner end surface 16 of the inner ring 3, and the inner ring 3 is held down in the axial direction by the holding surface portion 25, while the cylindrical surface. The part 13 is plastically deformed radially outward.

そして、この様に径方向外方に塑性変形させた部分を上記かしめ部１４とし、このかしめ部１４により、上記内輪３の内周面に設けた大径段部１２の段差面１５を抑え付ける。尚、本例の場合には、上記抑え面２５により内輪３の内端面１６を抑え付ける部分を、図２に示す様に、この内輪３の内端面１６のうち、上記段差面１５よりも径方向外側部分（図２のＸで示す部分）で、且つ、この外側部分の径方向中間部（図２の点Ｚ）よりも内径側部分（図２のＹで示す部分）とする。即ち、この内径側部分を抑え付けつつ、上記かしめ部１４を形成する。尚、更に好ましくは、上記内径側部分（図２のＹで示す部分）のうちで、この部分の径方向中間部よりも内径側を抑える。即ち、上記かしめ部１４と干渉しない範囲で、より内径側を抑える事が好ましい。又、図示は省略するが、内輪の内周面の内端部に、軸方向内方に向かう程内径寸法が大きくなる方向に傾斜した傾斜面部を設け、この傾斜面部をかしめ部により抑え付ける事もできる。   The portion plastically deformed radially outward is used as the caulking portion 14, and the caulking portion 14 suppresses the step surface 15 of the large-diameter step portion 12 provided on the inner peripheral surface of the inner ring 3. . In the case of this example, the portion that holds the inner end surface 16 of the inner ring 3 by the holding surface 25 is larger in diameter than the stepped surface 15 of the inner end surface 16 of the inner ring 3 as shown in FIG. An outer portion in the direction (portion indicated by X in FIG. 2) and a portion on the inner diameter side (portion indicated by Y in FIG. 2) from the radially intermediate portion (point Z in FIG. 2) of the outer portion. That is, the caulking portion 14 is formed while suppressing the inner diameter side portion. More preferably, among the inner diameter side portions (portions indicated by Y in FIG. 2), the inner diameter side is suppressed from the radial intermediate portion of this portion. That is, it is preferable to suppress the inner diameter side as long as it does not interfere with the caulking portion 14. Although not shown in the drawings, an inclined surface portion inclined in a direction in which the inner diameter dimension increases toward the inner side in the axial direction is provided at the inner end portion of the inner peripheral surface of the inner ring, and the inclined surface portion is suppressed by the caulking portion. You can also.

上述の様に、本例の場合には、かしめ部１４を形成する為の押型２２の一部を内輪３の内端面１６に当接させ、この内輪３を軸方向に抑え付けつつ上記かしめ部１４を形成する。この為、前述の特許文献３に記載された様な、内輪３の内端部外周縁を抑え付ける為の抑え治具を必要とせず、装置の径方向寸法の大型化を防止できる。しかも、本例の場合には図２に示した様に、上記内輪３の内端面１６の内径側を抑え付ける為、上記押型２２の径方向寸法を小さくできる（更なる装置の大型化の防止を図れる）他、上記内輪３のクリープを防止する為の軸力｛内輪３の外端面とこの外端面に当接する段差面２６との間（当接部）に加わる軸方向の力｝を十分に確保できる。   As described above, in the case of this example, a part of the pressing die 22 for forming the caulking portion 14 is brought into contact with the inner end surface 16 of the inner ring 3, and the caulking portion is held down while holding the inner ring 3 in the axial direction. 14 is formed. For this reason, a restraining jig for restraining the outer peripheral edge of the inner end portion of the inner ring 3 as described in Patent Document 3 is not required, and an increase in the radial dimension of the apparatus can be prevented. Moreover, in the case of this example, as shown in FIG. 2, since the inner diameter side of the inner end face 16 of the inner ring 3 is suppressed, the radial dimension of the pressing die 22 can be reduced (preventing further increase in the size of the device). In addition, a sufficient axial force {axial force applied between the outer end surface of the inner ring 3 and the stepped surface 26 contacting the outer end surface (contact portion)} for preventing the inner ring 3 from creeping is sufficient. Can be secured.

即ち、前述の特許文献３に記載されている技術の様に、内輪３の内端部外周縁を抑え治具により拘束する場合には、この内輪３を拘束する部分が、この内輪３のうちでハブ２の段差面２６とかしめ部１４とにより軸方向に挟持される部分から径方向に大きく外れる（遠くなる）。この場合に、この内輪３のうちで軸方向両側から挟持される部分の軸方向に関する弾性変形量（軸方向圧縮量）が、上記軸力の大きさに対応する（この部分の弾性変形量が大きい程軸力も大きくなる）が、上述の様に段差面２６とかしめ部１４とにより挟持される部分と上記抑え治具により拘束される部分との径方向のずれが大きく（遠く）なると、必要とする弾性変形量（圧縮量）、延いては、上記軸力を確保しにくくなる。   That is, as in the technique described in Patent Document 3 described above, when the outer peripheral edge of the inner end portion of the inner ring 3 is restrained by a jig, the portion that restrains the inner ring 3 is included in the inner ring 3. Thus, the hub 2 is largely separated (distant) in the radial direction from the portion clamped in the axial direction by the stepped surface 26 and the caulking portion 14. In this case, the amount of elastic deformation (axial compression amount) in the axial direction of the portion of the inner ring 3 held from both sides in the axial direction corresponds to the magnitude of the axial force (the amount of elastic deformation of this portion is The larger the axial force, the larger the axial force). However, it is necessary when the radial displacement between the portion clamped by the stepped surface 26 and the caulking portion 14 and the portion restrained by the holding jig becomes large (far) as described above. It becomes difficult to ensure the amount of elastic deformation (compression amount) and thus the axial force.

しかも、本例の様に、内輪３の内端面１６をかしめ部１４の内端面よりも軸方向内方に突出させる構造の場合には、前述した様に、かしめ部１４の寸法が小さくなる分、このかしめ部１４を形成する為の荷重（加工荷重）を大きくできず、この面からも、上記軸力を確保しにくくなる。これに対して、本例の場合には、上記内輪３の内端面１６の内径側を抑え付ける事により、この内輪３を抑え付ける部分と上記段差面２６とかしめ部１４とにより挟持される部分との径方向のずれを小さく（近く）している。この為、上記かしめ部１４を形成する為の荷重を大きくできなくても、上記挟持される部分の弾性変形量を大きくでき、上記軸力を十分に確保できる。   Moreover, in the case of the structure in which the inner end surface 16 of the inner ring 3 protrudes inward in the axial direction from the inner end surface of the caulking portion 14 as in this example, as described above, the size of the caulking portion 14 is reduced. The load (working load) for forming the caulking portion 14 cannot be increased, and it is difficult to secure the axial force from this surface. On the other hand, in the case of the present example, by suppressing the inner diameter side of the inner end surface 16 of the inner ring 3, a portion that suppresses the inner ring 3, and a portion that is sandwiched between the stepped surface 26 and the caulking portion 14. The deviation in the radial direction is made small (near). For this reason, even if the load for forming the caulking portion 14 cannot be increased, the amount of elastic deformation of the sandwiched portion can be increased, and the axial force can be sufficiently secured.

又、本例の場合には、かしめ部１４を平押しかしめにより形成している（押型２２を軸方向に変位させる）為、揺動かしめの様な、かしめ部１４を形成する際に円筒部１３に逃げを生じる事がない。この為、この様な逃げに伴う、上記内輪３に加わる軸方向の荷重（圧縮力）の低減を防止でき、この内輪３のうちでハブ２の段差面２６とかしめ部１４とにより軸方向に挟持される部分の弾性変形量、延いては、上記軸力を十分に確保できる。
尚、製造装置の小型化の要請が低ければ、上述の様な押型２２とは別体に設けた押圧部材（図示省略）を内輪３の内端面１６に当接させる事もできる。この場合にも、上述の様に内輪３の内端面１６の内径側を抑え付けたり、平押しかしめによりかしめ部１４を形成すれば、このかしめ部１４を形成する為の荷重（加工荷重）を大きくできなくても、上記内輪３（のうちでハブ２の段差面２６とかしめ部１４とにより軸方向に挟持される部分）の弾性変形量、延いては、上記軸力を十分に確保できる。 In this example, since the caulking portion 14 is formed by flat pressing (displacement of the pressing die 22 in the axial direction), the cylindrical portion is formed when the caulking portion 14 such as swing caulking is formed. 13 will not run away. For this reason, it is possible to prevent a reduction in the axial load (compression force) applied to the inner ring 3 due to such escape, and the stepped surface 26 of the hub 2 and the caulking portion 14 in the inner ring 3 are used in the axial direction. The amount of elastic deformation of the sandwiched portion, that is, the axial force can be sufficiently secured.
In addition, if the request | requirement of size reduction of a manufacturing apparatus is low, the press member (illustration omitted) provided separately from the above press die 22 can also be contact | abutted to the inner end surface 16 of the inner ring | wheel 3. Also in this case, if the inner diameter side of the inner end face 16 of the inner ring 3 is suppressed as described above, or if the caulking portion 14 is formed by flat pressing, the load (working load) for forming the caulking portion 14 is increased. Even if it cannot be increased, the amount of elastic deformation of the inner ring 3 (of which the portion clamped in the axial direction by the stepped surface 26 of the hub 2 and the caulking portion 14), and thus the axial force can be sufficiently secured. .

本例の効果を確認する為に行なったＦＥＭ解析の結果を、図３に示す。この図３は、内輪３に付与される軸力と、かしめ部を形成する為に加える荷重（加工荷重）との関係を示している。本例の様な、内輪３の内端面１６をかしめ部１４の内端面よりも軸方向内方に突出させる構造の場合には、このかしめ部１４で亀裂等の損傷を防止し、必要な耐久性を確保する為に、上記荷重（加工荷重）が３５ｔ（乃至は３０ｔ）以下となる。図３から明らかな様に、本例の場合には、この様な荷重（加工荷重）が３５ｔ（乃至は３０ｔ）以下の範囲で、内輪３の軸力を大きくできる効果を特に顕著に得られる。   The result of the FEM analysis performed in order to confirm the effect of this example is shown in FIG. FIG. 3 shows the relationship between the axial force applied to the inner ring 3 and the load (processing load) applied to form the caulking portion. In the case of the structure in which the inner end face 16 of the inner ring 3 protrudes inward in the axial direction from the inner end face of the caulking portion 14 as in this example, the caulking portion 14 prevents damage such as cracks and the necessary durability. In order to ensure the property, the load (working load) is 35 t (or 30 t) or less. As is apparent from FIG. 3, in the case of this example, the effect of increasing the axial force of the inner ring 3 can be obtained particularly remarkably when such a load (working load) is in the range of 35 t (or 30 t) or less. .

本発明の実施の形態の１例を示す要部断面図で、（Ａ）は、かしめ部を形成する前の状態を、（Ｂ）は、押型により内輪の内端面を抑え付けつつかしめ部を形成している状態を、それぞれ示している。BRIEF DESCRIPTION OF THE DRAWINGS It is principal part sectional drawing which shows an example of embodiment of this invention, (A) is the state before forming a crimping part, (B) is a crimping part, pressing down the inner end surface of an inner ring | wheel with a pressing die. Each forming state is shown. 内輪の抑え付け位置を説明する為の半部断面図。The half part sectional view for demonstrating the restraining position of an inner ring | wheel. 内輪の軸力とかしめ部を形成する為に付与する加工荷重（平押し荷重）との関係を示す線図。The diagram which shows the relationship between the axial load of an inner ring | wheel, and the process load (flat pressing load) provided in order to form a crimping part. 駆動輪支持用ハブユニットに等速ジョイントのスプライン軸を結合した状態を示す半部断面図。The half part sectional view which shows the state which couple | bonded the spline shaft of the constant velocity joint to the hub unit for driving wheel support. 軸力を説明する為の断面図。Sectional drawing for demonstrating axial force. 揺動かしめの際の逃げを説明する為の図で、（Ａ）は要部断面図、（Ｂ）は（Ａ）の矢視図。It is a figure for demonstrating the escape in the case of rocking caulking, (A) is principal part sectional drawing, (B) is an arrow directional view of (A).

符号の説明Explanation of symbols

１ 外輪
２、２ａ ハブ
３、３ａ 内輪
４ 転動体
５ 第一の外輪軌道
６ 第二の外輪軌道
７ 取付フランジ
８ 第一の内輪軌道
９ 第二の内輪軌道
１０ 小径段部
１１ スプライン孔
１２ 大径段部
１３、１３ａ 円筒部
１４、１４ａ かしめ部
１５ 段差面
１６、１６ａ 内端面
１７ 等速ジョイント用外輪
１８ 外端面
１９ スプライン軸
２０ ナット
２１ 押型
２２ 押型
２３ かしめ部形成装置
２４ 加工面部
２５ 抑え面部
２６ 段差面 DESCRIPTION OF SYMBOLS 1 Outer ring 2, 2a Hub 3, 3a Inner ring 4 Rolling element 5 First outer ring raceway 6 Second outer ring raceway 7 Mounting flange 8 First inner ring raceway 9 Second inner ring raceway 10 Small diameter step part 11 Spline hole 12 Large diameter Stepped portion 13, 13a Cylindrical portion 14, 14a Caulking portion 15 Stepped surface 16, 16a Inner end surface 17 Outer ring for constant velocity joint 18 Outer end surface 19 Spline shaft 20 Nut 21 Stamping die 22 Pushing die 23 Caulking portion forming device 24 Processing surface portion 25 Holding surface portion 26 Step surface

Claims (8)

外周面の外端寄り部分に車輪を支持する為の取付フランジを、同じく中間部に第一の内輪軌道を、同じく内端部にこの第一の内輪軌道を形成した部分よりも外径寸法が小さくなった小径段部を、それぞれ形成したハブと、この小径段部に外嵌された、外周面に第二の内輪軌道を形成した内輪と、内周面に上記第一の内輪軌道に対向する第一の外輪軌道及びこの第二の内輪軌道に対向する第二の外輪軌道を形成した外輪と、これら第一、第二の内輪軌道とこれら第一、第二の外輪軌道との間に、それぞれ複数個ずつ設けられた転動体とを備え、上記内輪の内周面の内端部に、この内周面の中間部よりも内径寸法が大きくなった大径段部又は軸方向内方に向かう程内径寸法が大きくなる傾斜面部を設け、上記中間部とこの大径段部との間に存在する段差面又はこの傾斜面部を、上記ハブの内端部に設けた円筒部を径方向外方に塑性変形させて形成したかしめ部により抑え付ける事で、上記内輪を上記ハブに結合固定すると共に、この内輪の内端面を上記かしめ部の内端面よりも軸方向内方に突出させている駆動輪支持用ハブユニットの製造方法に於いて、上記円筒部を径方向外方に塑性変形させて上記かしめ部を形成する際に、この円筒部を抑え付けてこのかしめ部を形成する為の押型の一部を、上記塑性変形の進行に伴い上記内輪の内端面に当接させ、この内輪を軸方向に抑え付けつつ、上記かしめ部を形成する事を特徴とする駆動輪支持用ハブユニットの製造方法。   Mounting flange for supporting the wheel on the outer end portion of the outer peripheral surface, the first inner ring raceway in the middle part, and the outer diameter dimension than the part where the first inner ring raceway is also formed in the inner end part. A hub formed with small diameter stepped portions, an inner ring externally fitted to the small diameter stepped portion and having a second inner ring raceway formed on the outer peripheral surface, and the inner peripheral surface facing the first inner ring raceway. Between the first and second inner ring raceways and the first and second outer ring raceways. Each having a plurality of rolling elements, and a large-diameter stepped portion or an axially inward portion having an inner diameter larger than an intermediate portion of the inner peripheral surface at an inner end portion of the inner peripheral surface of the inner ring. An inclined surface part whose inner diameter dimension increases toward the center is provided between the intermediate part and the large-diameter step part. The inner ring is coupled and fixed to the hub by suppressing the stepped surface or the inclined surface portion by a caulking portion formed by plastic deformation of the cylindrical portion provided at the inner end portion of the hub in the radially outward direction. In the manufacturing method of the hub unit for driving wheel support in which the inner end surface of the inner ring protrudes inward in the axial direction from the inner end surface of the caulking portion, the cylindrical portion is plastically deformed radially outward to When forming the caulking portion, a part of the pressing die for pressing the cylindrical portion to form the caulking portion is brought into contact with the inner end surface of the inner ring as the plastic deformation proceeds, and the inner ring is pivoted. A method for manufacturing a hub unit for supporting a driving wheel, wherein the caulking portion is formed while restraining in a direction. 押型と別体に設けた押圧部材を内輪の内端面に当接させ、この内輪を軸方向に抑え付けつつ、上記押型によりかしめ部を形成する、請求項１に記載した駆動輪支持用ハブユニットの製造方法。   2. The driving wheel supporting hub unit according to claim 1, wherein a pressing member provided separately from the pressing die is brought into contact with an inner end surface of the inner ring, and the caulking portion is formed by the pressing die while pressing the inner ring in the axial direction. Manufacturing method. 押型の一部に設けた円環状の加工面部を円筒部の内端縁部に全周に亙り押し当てたまま、この押型をハブに対し揺動させる事なく、この押型をこのハブに向け軸方向に押圧する事により、上記円筒部を全周に亙り同時に、上記加工面部に沿って径方向外方に塑性変形させる、請求項１〜２のうちの何れか１項に記載した駆動輪支持用ハブユニットの製造方法。   The ring-shaped machining surface provided on a part of the die is pressed against the inner edge of the cylindrical part over the entire circumference, and the die is moved toward the hub without swinging the die against the hub. The driving wheel support according to any one of claims 1 to 2, wherein the cylindrical portion is plastically deformed radially outward along the processed surface portion at the same time by being pressed in a direction. Of manufacturing a hub unit for a vehicle. 内輪の内端面のうち、段差面又は傾斜面部よりも径方向外側部分で、且つ、この外側部分の径方向中間部よりも内径側を抑え付けつつ、かしめ部を形成する、請求項１〜３のうちの何れか１項に記載した駆動輪支持用ハブユニットの製造方法。   The caulking portion is formed on the inner end surface of the inner ring at a radially outer portion than the stepped surface or the inclined surface portion and while suppressing the inner diameter side from the radially intermediate portion of the outer portion. The manufacturing method of the hub unit for driving wheel support described in any one of these. 外周面の外端寄り部分に車輪を支持する為の取付フランジを、同じく中間部に第一の内輪軌道を、同じく内端部にこの第一の内輪軌道を形成した部分よりも外径寸法が小さくなった小径段部を、それぞれ形成したハブと、この小径段部に外嵌された、外周面に第二の内輪軌道を形成した内輪と、内周面に上記第一の内輪軌道に対向する第一の外輪軌道及びこの第二の内輪軌道に対向する第二の外輪軌道を形成した外輪と、これら第一、第二の内輪軌道とこれら第一、第二の外輪軌道との間に、それぞれ複数個ずつ設けられた転動体とを備え、上記内輪の内周面の内端部に、この内周面の中間部よりも内径寸法が大きくなった大径段部又は軸方向内方に向かう程内径寸法が大きくなる傾斜面部を設け、上記中間部とこの大径段部との間に存在する段差面又はこの傾斜面部を、上記ハブの内端部に設けた円筒部を径方向外方に塑性変形させて形成したかしめ部により抑え付ける事で、上記内輪を上記ハブに結合固定すると共に、この内輪の内端面を上記かしめ部の内端面よりも軸方向内方に突出させている駆動輪支持用ハブユニットを造る為、上記ハブを支持する為の支持手段と、上記円筒部を抑え付けて上記かしめ部を形成する為の押型と、この押型を押圧する為の押圧手段とを備えた駆動輪支持用ハブユニットの製造装置に於いて、この押型は、上記円筒部と当接してこの円筒部を径方向外方に塑性変形させる加工面部と、この加工面部よりも径方向外側に設けられ、この塑性変形の際にこの塑性変形の進行に伴い上記内輪の内端面と当接して、この内輪を軸方向に抑え付ける抑え面部とを有するものである事を特徴とする駆動輪支持用ハブユニットの製造装置。   Mounting flange for supporting the wheel on the outer end portion of the outer peripheral surface, the first inner ring raceway in the middle part, and the outer diameter dimension than the part where the first inner ring raceway is also formed in the inner end part. A hub formed with small diameter stepped portions, an inner ring externally fitted to the small diameter stepped portion and having a second inner ring raceway formed on the outer peripheral surface, and the inner peripheral surface facing the first inner ring raceway. Between the first and second inner ring raceways and the first and second outer ring raceways. Each having a plurality of rolling elements, and a large-diameter stepped portion or an axially inward portion having an inner diameter larger than an intermediate portion of the inner peripheral surface at an inner end portion of the inner peripheral surface of the inner ring. An inclined surface part whose inner diameter dimension increases toward the center is provided between the intermediate part and the large-diameter step part. The inner ring is coupled and fixed to the hub by suppressing the stepped surface or the inclined surface portion by a caulking portion formed by plastic deformation of the cylindrical portion provided at the inner end portion of the hub in the radially outward direction. In order to construct a drive wheel support hub unit in which the inner end surface of the inner ring protrudes inward in the axial direction from the inner end surface of the caulking portion, the supporting means for supporting the hub and the cylindrical portion are suppressed. In a manufacturing apparatus of a hub unit for supporting a driving wheel provided with a pressing die for forming the caulking portion and a pressing means for pressing the pressing die, the pressing die abuts on the cylindrical portion. A processing surface portion that plastically deforms the cylindrical portion outward in the radial direction and a radially outer side than the processing surface portion, and in contact with the inner end surface of the inner ring as the plastic deformation progresses during the plastic deformation, Hold down this inner ring in the axial direction Apparatus for producing a drive wheel supporting hub unit, characterized in that those having a part. 押型と別体に設けた押圧部材に、内輪の内端面と当接してこの内輪を軸方向に抑え付ける抑え面部を設けた、請求項５に記載した駆動輪支持用ハブユニットの製造装置。   The drive wheel support hub unit manufacturing apparatus according to claim 5, wherein a pressing member provided separately from the pressing die is provided with a pressing surface portion that abuts the inner end surface of the inner ring and holds the inner ring in the axial direction. 押圧手段が、押型の加工面部を円筒部の内端縁部に全周に亙り押し当てたまま、この押型をハブに対し揺動させる事なく、この押型をこのハブに向け軸方向に押圧するものであり、この押圧手段の押圧に基づいて、上記円筒部を全周に亙り同時に、上記加工面部に沿って径方向外方に塑性変形させる、請求項５〜６のうちの何れか１項に記載した駆動輪支持用ハブユニットの製造装置。   The pressing means presses the pressing die in the axial direction toward the hub without swinging the pressing die against the hub while pressing the processing surface portion of the pressing die against the inner end edge of the cylindrical portion over the entire circumference. 7. The apparatus according to claim 5, wherein, based on the pressure of the pressing means, the cylindrical portion is simultaneously plastically deformed radially outward along the processed surface portion over the entire circumference. The manufacturing apparatus of the hub unit for driving wheel support described in 2. 抑え面部が、内輪の内端面のうち、段差面又は傾斜面部よりも径方向外側部分で、且つ、この外側部分の径方向中間部よりも内径側を抑え付けるものである、請求項５〜７のうちの何れか１項に記載した駆動輪支持用ハブユニットの製造装置。   The restraining surface portion is a radially outer portion of the inner end surface of the inner ring than the stepped surface or the inclined surface portion, and restrains the inner diameter side from the radially intermediate portion of the outer portion. The manufacturing apparatus of the hub unit for driving wheel support described in any one of these.
JP2007061166A 2007-03-12 2007-03-12 Device and method for manufacturing hub unit for supporting drive wheel Pending JP2008223840A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010002156A1 (en) 2009-03-13 2011-04-07 Toyota Jidosha Kabushiki Kaisha, Toyota-shi A caulked holding member, method for holding a component by caulking, structure of a caulked holding member and caulking apparatus
KR101398982B1 (en) 2012-09-05 2014-05-27 주식회사 일진글로벌 Assembling structure and assembling method of wheel bearing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010002156A1 (en) 2009-03-13 2011-04-07 Toyota Jidosha Kabushiki Kaisha, Toyota-shi A caulked holding member, method for holding a component by caulking, structure of a caulked holding member and caulking apparatus
US8668620B2 (en) 2009-03-13 2014-03-11 Toyota Jidosha Kabushiki Kaisha Caulked retaining member, method for retaining member by caulking, structure of caulked retaining member, and caulking apparatus
KR101398982B1 (en) 2012-09-05 2014-05-27 주식회사 일진글로벌 Assembling structure and assembling method of wheel bearing

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