JP2006312371A - Bearing unit for supporting wheel and manufacturing method for bearing unit - Google Patents

Bearing unit for supporting wheel and manufacturing method for bearing unit Download PDF

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JP2006312371A
JP2006312371A JP2005135651A JP2005135651A JP2006312371A JP 2006312371 A JP2006312371 A JP 2006312371A JP 2005135651 A JP2005135651 A JP 2005135651A JP 2005135651 A JP2005135651 A JP 2005135651A JP 2006312371 A JP2006312371 A JP 2006312371A
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stationary
flange
bearing unit
wheel
rotating
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JP2006312371A5 (en
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Kazuhiro Kinouchi
一宏 木野内
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NSK Ltd
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NSK Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To achieve a manufacturing method for a bearing unit capable of providing a good flatness of the inner side face 33 of a coupling flange 12 as a surface to be contacted with the side face of a knuckle in such a condition as installed in a vehicle. <P>SOLUTION: A hub 8 is fixed in the condition that the bearing unit for supporting a wheel, and a turning process is applied to the inner side face 33 of the coupling flange 12 while the outer ring 6 is rotated. Therefore, the problems according to the conventional arrangement are solved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は、自動車の車輪を懸架装置に対して回転自在に支持する為に使用する車輪支持用軸受ユニットとその製造方法の改良に関する。   The present invention relates to a wheel support bearing unit used for rotatably supporting a wheel of an automobile with respect to a suspension device and an improvement of a manufacturing method thereof.

自動車の車輪を構成するホイール1及び制動装置を構成する制動用回転部材であるディスク2は、例えば図5に示す様な車輪支持装置により、車体に対して回転自在に支持している。この車輪支持装置は、懸架装置を構成するナックル3と、車輪支持用軸受ユニット4とから成る。即ち、この様な車輪支持装置を構成する為、上記ナックル3に形成した円形の支持孔5部分に、上記車輪支持用軸受ユニット4を構成する、静止側部材である外輪6を、複数本のボルト7により結合固定している。一方、上記車輪支持用軸受ユニット4を構成する、回転側部材であるハブ8に、上記ホイール1及びディスク2を、複数本のスタッド9とナット10とにより結合固定している。   A wheel 1 constituting a wheel of an automobile and a disc 2 as a braking rotating member constituting a braking device are supported rotatably with respect to the vehicle body by a wheel support device as shown in FIG. 5, for example. The wheel support device includes a knuckle 3 constituting a suspension device and a wheel support bearing unit 4. That is, in order to configure such a wheel support device, a plurality of outer rings 6 that are stationary members constituting the wheel support bearing unit 4 are formed in a circular support hole 5 portion formed in the knuckle 3. The bolts 7 are connected and fixed. On the other hand, the wheel 1 and the disk 2 are coupled and fixed to a hub 8 that constitutes the wheel support bearing unit 4, which is a rotating member, by a plurality of studs 9 and nuts 10.

上記外輪6の内周面には、それぞれが静止側軌道である1対の外輪軌道11a、11bを、外周面には静止側フランジである、図6に示す様な結合フランジ12を、それぞれ形成している。この結合フランジ12の円周方向複数個所(図示の例では4個所)にはねじ孔13、13を、この結合フランジ12を軸方向に貫通する状態で設けている。図6に示す様に、この結合フランジ12の径方向長さ(高さ)は、円周方向に関して、上記各ねじ孔13、13を設けた部分で大きくし、それ以外の部分で小さくしている。この様な外輪6を上記ナックル3に結合固定する為に、図示の例では、このナックル3の支持孔5に上記外輪6の内端部をがたつきなく内嵌すると共に、このナックル3の側面32に上記結合フランジ12の内側面33を当接させている。そして、この状態で、上記ナックル3のうち上記各ねじ孔13、13と整合する部分に形成した各通孔14内に、それぞれ上記各ボルト7を挿通すると共に、これら各ボルト7の先端部を上記各ねじ孔13、13に螺合し、更に緊締している。   A pair of outer ring raceways 11a and 11b, each of which is a stationary side raceway, are formed on the inner peripheral surface of the outer ring 6, and a coupling flange 12 as shown in FIG. is doing. Screw holes 13 and 13 are provided at a plurality of circumferential positions (four in the illustrated example) of the coupling flange 12 so as to penetrate the coupling flange 12 in the axial direction. As shown in FIG. 6, the radial length (height) of the coupling flange 12 is increased at the portion where the screw holes 13 and 13 are provided and reduced at the other portions in the circumferential direction. Yes. In order to couple and fix such an outer ring 6 to the knuckle 3, in the illustrated example, the inner end of the outer ring 6 is fitted into the support hole 5 of the knuckle 3 without rattling. The inner surface 33 of the coupling flange 12 is brought into contact with the side surface 32. And in this state, while inserting each said bolt 7 in each through-hole 14 formed in the part which aligns with each said screw hole 13 of the said knuckle 3, respectively, the front-end | tip part of each of these bolt 7 is made to pass. The screw holes 13 are screwed together and further tightened.

これに対し、上記ハブ8の外周面の一部で、上記外輪6の外端開口(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3、4、5、7、8の左側。反対に、自動車への組み付け状態で幅方向内側となる、図3、4、5、7、8の右側を、軸方向に関して内と言う。本明細書全体で同じ。)から突出した部分には、回転側フランジである取付フランジ15を形成している。上記ホイール1及びディスク2は、この取付フランジ15の外側面34に、上記各スタッド9とナット10とにより支持固定している。又、上記ハブ8の中間部外周面で、上記両外輪軌道11a、11bのうち、外側の外輪軌道11aに対向する部分に外側の内輪軌道16aを、直接形成している。更に、上記ハブ8の内端部に形成した小径段部17に、内輪18を外嵌固定している。そして、この内輪18の外周面に形成した内側の内輪軌道16bを、上記両外輪軌道11a、11bのうち、内側の外輪軌道11bに対向させている。尚、上記外側の外輪軌道11aは、上記ハブ8の中間部に外嵌した別体の内輪の外周面に形成する場合もある。   On the other hand, at a part of the outer peripheral surface of the hub 8, the outer end opening of the outer ring 6 (outside with respect to the axial direction means the outside in the width direction of the vehicle in the assembled state in the automobile, and FIGS. 7, 8, 8. On the other hand, the right side of Fig. 3, 4, 5, 7, 8 which is the inner side in the width direction when assembled to the automobile is referred to as the inner side in the axial direction. The mounting flange 15 which is a rotation side flange is formed in the part which protruded from this. The wheel 1 and the disk 2 are supported and fixed to the outer surface 34 of the mounting flange 15 by the studs 9 and the nuts 10. Further, on the outer peripheral surface of the intermediate portion of the hub 8, an outer inner ring raceway 16a is directly formed on a portion of the outer ring raceways 11a and 11b that faces the outer outer ring raceway 11a. Further, an inner ring 18 is externally fixed to a small diameter step portion 17 formed at the inner end portion of the hub 8. The inner ring raceway 16b formed on the outer peripheral surface of the inner ring 18 is opposed to the inner ring raceway 11b of the outer ring raceways 11a and 11b. The outer outer ring raceway 11 a may be formed on the outer peripheral surface of a separate inner ring that is externally fitted to the intermediate portion of the hub 8.

又、上記両外輪軌道11a、11bと上記両内輪軌道16a、16bとの間には、転動体である玉19、19を、それぞれ複数個ずつ転動自在に設けている。尚、図示の例では転動体として玉19、19を使用しているが、重量が嵩む自動車用の軸受ユニットの場合には、テーパころを使用する場合もある。又、上記ハブ8の内端部には、この内端部を径方向外方に塑性変形させる事により、かしめ部20を形成している。そして、このかしめ部20により、上記内輪18の内端面を抑え付けている。そして、この抑え付け力により、上記各玉19、19に予圧を付与している。更に、図示の例は、駆動輪(FR車及びRR車の後輪、FF車の前輪、4WD車の全車輪)用の車輪支持装置である為、上記ハブ8の中心部に、スプライン孔21を形成している。そして、このスプライン孔21に、等速ジョイント22のスプライン軸23を挿入している。   Further, a plurality of balls 19, 19 as rolling elements are provided between the outer ring raceways 11a, 11b and the inner ring raceways 16a, 16b, respectively, so as to be capable of rolling. In the illustrated example, balls 19 are used as rolling elements, but in the case of an automobile bearing unit that is heavy in weight, tapered rollers may be used. A caulking portion 20 is formed on the inner end portion of the hub 8 by plastically deforming the inner end portion radially outward. The caulking portion 20 holds down the inner end surface of the inner ring 18. And by this pressing force, a preload is applied to each of the balls 19, 19. Further, since the illustrated example is a wheel support device for driving wheels (the rear wheels of the FR vehicle and the RR vehicle, the front wheels of the FF vehicle, and all wheels of the 4WD vehicle), the spline hole 21 is formed at the center of the hub 8. Is forming. The spline shaft 23 of the constant velocity joint 22 is inserted into the spline hole 21.

次に、図7は、車輪支持用軸受ユニットの従来構造の第2例として、従動輪(FR車及びRR車の前輪、FF車の後輪)用のものを示している。この第2例の車輪支持用軸受ユニット4aは、従動輪用である為、ハブ8aの中心部に、駆動軸であるスプライン軸を挿入する為のスプライン孔を設けていない。ナックルとの組み合わせにより車輪支持装置を構成する態様等、その他の構成及び作用は、上述の図5〜6に示した第1例の場合と同様である。   Next, FIG. 7 shows a driven wheel (a front wheel of an FR vehicle and an RR vehicle, a rear wheel of an FF vehicle) as a second example of a conventional structure of a wheel support bearing unit. Since the wheel support bearing unit 4a of the second example is for a driven wheel, a spline hole for inserting a spline shaft as a drive shaft is not provided at the center of the hub 8a. Other configurations and operations, such as an aspect of configuring the wheel support device in combination with a knuckle, are the same as those in the first example shown in FIGS.

次に、図8は、車輪支持用軸受ユニットの従来構造の第3例として、やはり従動輪用のものを示している。この第3例の車輪支持用ハブユニット4bの場合、回転側部材である外輪6aの径方向内側に、静止側部材である軸部材24を、同心に設けている。このうちの外輪6aは、外周面の外端寄り部分に車輪及びディスクを支持固定する為の取付フランジ15を、内周面に複列の外輪軌道11a、11bを、それぞれ形成している。又、上記軸部材24は、外周面の内端部にナックルに結合固定する為の結合フランジ12を、同じく中間部に内側の内輪軌道16bを、同じく外端部に小径段部17を、それぞれ形成している。そして、この小径段部17に、外周面に外側の内輪軌道16aを形成した内輪18を外嵌固定している。そして、上記各外輪軌道11a、11bと上記各内輪軌道16a、16bとの間に玉19、19を、それぞれ複数個ずつ転動自在に設けている。又、上記内輪18の外端面を、上記軸部材24の外端部を径方向外方に塑性変形させて形成したかしめ部20により抑え付けている。車輪支持装置を構成する際には、前述の図5に示した第1例の場合と同様にして、上記結合フランジ12を上記ナックルに結合固定する。   Next, FIG. 8 shows a driven wheel as a third example of the conventional structure of the wheel supporting bearing unit. In the wheel supporting hub unit 4b of the third example, a shaft member 24 that is a stationary member is provided concentrically on the radially inner side of the outer ring 6a that is a rotating member. Of these, the outer ring 6a is formed with a mounting flange 15 for supporting and fixing the wheel and the disk near the outer end portion of the outer peripheral surface, and double row outer ring raceways 11a and 11b on the inner peripheral surface. Further, the shaft member 24 has a coupling flange 12 for coupling and fixing to a knuckle at an inner end portion of an outer peripheral surface, an inner ring raceway 16b at an intermediate portion, and a small diameter step portion 17 at an outer end portion, respectively. Forming. An inner ring 18 having an outer ring raceway 16a formed on the outer peripheral surface is externally fitted and fixed to the small diameter step portion 17. A plurality of balls 19, 19 are provided between the outer ring raceways 11a, 11b and the inner ring raceways 16a, 16b, respectively, so that they can roll. Further, the outer end surface of the inner ring 18 is suppressed by a caulking portion 20 formed by plastically deforming the outer end portion of the shaft member 24 radially outward. When configuring the wheel support device, the coupling flange 12 is coupled and fixed to the knuckle in the same manner as in the first example shown in FIG.

尚、車輪支持用軸受ユニットを構成する結合フランジとナックルとの結合構造としては、図9に示す様な構造を採用する事もできる。この図9に示した構造の場合には、結合フランジ12の内側面33にナックル3の側面32を当接させた状態で、この結合フランジ12に形成した通孔14にボルト7を挿通すると共に、このボルト7の先端部を、上記ナックル3に形成したねじ孔13に螺合し、更に緊締している。この状態で、上記結合フランジ12は、上記ナックル3と上記ボルト7の頭部25との間に挟持される。   In addition, as a coupling structure of the coupling flange and the knuckle constituting the wheel support bearing unit, a structure as shown in FIG. 9 can be adopted. In the case of the structure shown in FIG. 9, the bolt 7 is inserted into the through hole 14 formed in the coupling flange 12 with the side surface 32 of the knuckle 3 being in contact with the inner side surface 33 of the coupling flange 12. The tip of the bolt 7 is screwed into a screw hole 13 formed in the knuckle 3 and further tightened. In this state, the coupling flange 12 is sandwiched between the knuckle 3 and the head 25 of the bolt 7.

ところで、近年、乗り心地及び操縦安定性の向上等を目的として、自動車のばね下重量を減らす為に、上述した様な車輪支持用軸受ユニット4、4a、4bを構成する結合フランジ12の薄肉化が行なわれている。この様な薄肉化は、この結合フランジ12の耐久性を十分に確保できる範囲内で行なう必要がある。従って、この結合フランジ12の薄肉化を行ない易くする為に、この結合フランジ12の耐久性を向上させる事が重要となる。この結合フランジ12の耐久性は、使用時の結合フランジ12の負荷条件を緩和する事により、向上させる事ができる。   By the way, in recent years, for the purpose of improving ride comfort and driving stability, etc., in order to reduce the unsprung weight of the automobile, the coupling flange 12 constituting the wheel support bearing units 4, 4 a, 4 b as described above is made thinner. Has been done. Such thinning needs to be performed within a range in which the durability of the coupling flange 12 can be sufficiently secured. Therefore, in order to facilitate the thinning of the coupling flange 12, it is important to improve the durability of the coupling flange 12. The durability of the coupling flange 12 can be improved by relaxing the load condition of the coupling flange 12 during use.

そこで、次に、使用時の結合フランジ12の負荷条件に就いて考える。上述した様に、車輪支持用軸受ユニット4、4a、4bを車両に組み付ける場合には、ナックル3の側面32に上記結合フランジ12の内側面33を、ボルト7の緊締力に基づいて強く接触させる。この状態で、上記ナックル3の側面32と上記結合フランジ12の内側面33との平面度がそれぞれ良好である場合には、これら両側面32、33同士の接触状態が全体的に均一になる。従って、この場合には、上記ボルト7の緊締力や自動車の走行時に発生する各種荷重(旋回荷重、衝撃荷重、振動等)が、それぞれ上記結合フランジ12の内側面33の全体若しくは広い範囲に対して均一に加わる様になり、この結合フランジ12の負荷条件が緩和される。これに対し、上記ナックル3の側面32の平面度は良好であるが、上記結合フランジ12の内側面33の平面度が良好でない場合には、これら両側面32、33同士の接触状態が全体的に不均一になる。この結果、上記ボルト7の緊締力や自動車の走行時に発生する各種荷重が、それぞれ上記結合フランジ12の内側面33の全体に対して不均一に加わる様になる。具体的には、この結合フランジ12の内側面33と上記ナックル3の側面32との接触面圧が局部的に大きくなる。従って、この場合には、上記結合フランジ12の負荷条件が厳しくなる。   Therefore, next, the load condition of the coupling flange 12 at the time of use will be considered. As described above, when the wheel support bearing units 4, 4 a, 4 b are assembled to the vehicle, the inner side surface 33 of the coupling flange 12 is brought into strong contact with the side surface 32 of the knuckle 3 based on the tightening force of the bolt 7. . In this state, when the flatness between the side surface 32 of the knuckle 3 and the inner side surface 33 of the coupling flange 12 is good, the contact state between the side surfaces 32 and 33 becomes uniform as a whole. Accordingly, in this case, the tightening force of the bolt 7 and various loads (swivel load, impact load, vibration, etc.) generated during traveling of the vehicle are respectively applied to the entire inner surface 33 of the coupling flange 12 or a wide range. Thus, the load condition of the coupling flange 12 is relaxed. On the other hand, the flatness of the side surface 32 of the knuckle 3 is good, but when the flatness of the inner side surface 33 of the coupling flange 12 is not good, the contact state between the both side surfaces 32 and 33 is overall. Becomes uneven. As a result, the tightening force of the bolt 7 and various loads generated when the vehicle is running are applied non-uniformly to the entire inner surface 33 of the coupling flange 12. Specifically, the contact surface pressure between the inner side surface 33 of the coupling flange 12 and the side surface 32 of the knuckle 3 is locally increased. Therefore, in this case, the load condition of the coupling flange 12 becomes severe.

そこで、従来から、上記結合フランジ12の負荷条件を緩和できる様にすべく、この結合フランジ12の内側面33の平面度を良好にする為に、静止側部材(外輪6、軸部材24)の製造時に、上記内側面33に切削加工を施す事が行なわれている。ところが、この様な切削加工を行なっても、上記内側面33の平面度を十分には良好にできなかったり、或はこの切削加工後に行なう熱処理や穿孔加工により熱変形や塑性変形が生じ、上記内側面33の平面度が悪化する場合がある。   Therefore, conventionally, in order to improve the flatness of the inner side surface 33 of the coupling flange 12 so that the load condition of the coupling flange 12 can be relaxed, the stationary side member (outer ring 6, shaft member 24) At the time of manufacture, the inner surface 33 is cut. However, even if such a cutting process is performed, the flatness of the inner side surface 33 cannot be sufficiently improved, or thermal deformation or plastic deformation occurs due to heat treatment or drilling performed after the cutting process, The flatness of the inner side surface 33 may deteriorate.

又、前述の図9に示した構造の様に、上記ボルト7の頭部25の側面を上記結合フランジ12の外側面35に当接させる構造の場合には、この外側面35のうち当該当接させる部分の平面度を良好にする事が、上記結合フランジ12の負荷条件を緩和する事に繋がる。但し、この外側面35に就いても、上記内側面33の場合と同様の理由で、平面度を良好にできなくなる場合がある。
尚、本発明に関連する先行技術文献として、特許文献1があるが、この特許文献1に記載された発明は、取付フランジ15の外側面の加工に関するもので、上記結合フランジ12の負荷条件を緩和できるものではない。
In the case of a structure in which the side surface of the head 25 of the bolt 7 is brought into contact with the outer surface 35 of the coupling flange 12 as in the structure shown in FIG. Making the flatness of the contacted portion good leads to alleviating the load condition of the coupling flange 12. However, even for the outer side surface 35, the flatness may not be improved for the same reason as in the case of the inner side surface 33.
As a prior art document related to the present invention, there is Patent Document 1, but the invention described in Patent Document 1 relates to the processing of the outer surface of the mounting flange 15, and the load condition of the coupling flange 12 is as follows. It cannot be mitigated.

特表2003−514680号公報Special table 2003-514680 gazette

本発明の車輪支持用軸受ユニット及びその製造方法は、上述の様な事情に鑑み、静止側フランジの側面の平面度を良好にする事により、使用時の静止側フランジの負荷条件を緩和できる構造及びその製造方法を実現すべく発明したものである。   In view of the circumstances as described above, the wheel support bearing unit and the manufacturing method thereof according to the present invention can reduce the load condition of the stationary side flange during use by improving the flatness of the side surface of the stationary side flange. And the manufacturing method thereof.

本発明の対象となる車輪支持用軸受ユニットは、静止側周面に静止側軌道を、外周面に懸架装置を構成するナックルに結合固定する為の静止側フランジを、それぞれ有し、使用時にも回転しない静止側部材と、回転側周面に回転側軌道を、外周面に車輪及び制動用回転部材を支持固定する為の回転側フランジを、それぞれ有し、使用時に上記車輪及び制動用回転部材と共に回転する回転側部材と、上記静止側軌道と上記回転側軌道との間に転動自在に設けられた複数個の転動体とを備える。
特に、本発明の車輪支持用軸受ユニット及びその製造方法の場合には、上記静止側部材と上記回転側部材と上記各転動体とを使用時の状態に組み立てた後(即ち、この静止側部材に対し、熱処理、及び、ねじ孔若しくは通孔を形成した後)、上記回転側部材を回転不能に支持した状態で、上記静止側部材を回転させながら、上記静止側フランジの側面に旋削加工を施す事により、この側面の平面度を向上させる。
The wheel support bearing unit that is the subject of the present invention has a stationary side track on the stationary side circumferential surface and a stationary side flange on the outer circumferential surface for coupling and fixing to a knuckle that constitutes a suspension device. A stationary side member that does not rotate, a rotating side track on the rotating side peripheral surface, and a rotating side flange for supporting and fixing the wheel and the braking rotating member on the outer peripheral surface, respectively. A rotating side member that rotates together with the rotating side member, and a plurality of rolling elements that are rotatably provided between the stationary side track and the rotating side track.
In particular, in the case of the wheel support bearing unit and the manufacturing method thereof according to the present invention, after assembling the stationary side member, the rotating side member, and the rolling elements in a state in use (that is, the stationary side member). In contrast, after the heat treatment and the screw holes or through holes are formed), the side of the stationary side flange is turned while the stationary side member is rotated while the rotating side member is supported in a non-rotatable manner. By applying, the flatness of this side surface is improved.

上述した様な本発明の車輪支持用軸受ユニット及びその製造方法によれば、車輪支持用軸受ユニットの完成後の状態で、静止側フランジの側面の平面度を良好にできる。この為、車輪支持用軸受ユニットを車体に組み付けた状態で、静止側フランジの側面とナックルの側面(及び結合用ボルトの頭部の側面)との接触状態を、全体的に均一にする事ができる。従って、この結合ボルトの緊締力や自動車の走行時に発生する各種荷重を、それぞれ上記両側面同士の接触部の全体若しくは広い範囲で均一に受ける事ができ、これら両側面同士の接触面圧が局部的に大きくなる事を防止できる。この様に、本発明の場合には、静止側フランジの負荷条件を緩和する事ができる為、この静止側フランジの耐久性を向上させる事ができる。   According to the wheel support bearing unit and the manufacturing method thereof of the present invention as described above, the flatness of the side surface of the stationary flange can be improved after the wheel support bearing unit is completed. For this reason, the contact state between the side surface of the stationary flange and the side surface of the knuckle (and the side surface of the head of the coupling bolt) can be made uniform evenly with the wheel support bearing unit assembled to the vehicle body. it can. Therefore, the tightening force of the coupling bolt and various loads generated during the running of the vehicle can be uniformly received over the entire contact portion between the both side surfaces or in a wide range, and the contact surface pressure between the both side surfaces is locally Can be prevented from becoming large. Thus, in the case of this invention, since the load condition of a stationary side flange can be eased, durability of this stationary side flange can be improved.

本発明の車輪支持用軸受ユニット及びその製造方法を実施する場合に、好ましくは、請求項2、7に記載した様に、制動用回転部材の側面を当接させる面である、回転側フランジの片側面を基準面として、静止側フランジの側面に旋削加工を施す。これにより、この静止側フランジの側面を、上記回転側フランジの片側面と平行な面に仕上げる。
この様にすれば、自動車の運転時に、上記回転側フランジの片側面の回転振れを抑える事ができる。この為、この片側面に取り付ける上記制動用回転部材(及び車輪)の回転振れを抑える事ができて、その分だけ、上記静止側フランジの負荷条件を更に緩和する事ができ、この静止側フランジの耐久性を更に向上させる事ができる。
When carrying out the wheel support bearing unit and the manufacturing method thereof according to the present invention, preferably, as described in claims 2 and 7, the rotation side flange, which is a surface that abuts the side surface of the braking rotation member, is provided. Using one side as a reference plane, turn the side of the stationary flange. Thus, the side surface of the stationary side flange is finished to a surface parallel to one side surface of the rotating side flange.
In this way, it is possible to suppress rotational runout on one side surface of the rotation side flange during driving of the automobile. For this reason, it is possible to suppress the rotational vibration of the braking rotating member (and the wheel) attached to this one side surface, and the load condition of the stationary side flange can be further relaxed accordingly, and this stationary side flange The durability of the can be further improved.

ところで、一般的な車輪支持用軸受ユニットの場合、静止側部材の外周面に形成した静止側フランジの円周方向複数個所には、上記結合用ボルトを螺合させる為のねじ孔(又はこの結合用ボルトを挿通する為の通孔)を形成している。そして、上記静止側フランジの径方向長さ(高さ)を、円周方向に関して上記各ねじ孔(又は通孔)を形成した部分で大きくし、それ以外の部分で小さくしている。即ち、上記静止側フランジの径方向長さが、円周方向に関して不均一になっている。この様な車輪支持用軸受ユニットの場合、上記静止側フランジの側面のうち、この静止側フランジの径方向に関し、この静止側フランジの径方向長さの極大部と極小部との間に挟まれた円輪状の領域では、この静止側フランジの側面に対する旋削経路を円周方向にたどると、この静止側フランジが存在する個所と存在しない個所とが、交互に並んだ状態になっている。従って、上記静止側フランジの側面のうち、上記円輪状の領域に旋削加工を施す場合には、上記静止側フランジが回転する事に伴い、切削工具の刃がこの静止側フランジの側面に切り込んだ(接触した)状態と切り込まない(接触しない)状態とが交互に繰り返される。特に、この場合、上記静止側フランジの側面が単一平面になっている場合には、この静止側フランジが回転する事に伴い、上記切削工具の刃がこの側面から離れた後、再度この側面に乗り上がる際に、この切削工具の刃が、上記静止側フランジのうち径方向長さが周囲の部分に比べて大きくなっている部分の円周方向端縁に強くぶつかる。そして、この様に強くぶつかる事が、旋削加工中、何度も繰り返される。この為、上記切削工具の刃が破損し易くなると言った不都合を生じる。   By the way, in the case of a general wheel support bearing unit, screw holes (or this coupling) for screwing the coupling bolts at a plurality of locations in the circumferential direction of the stationary flange formed on the outer peripheral surface of the stationary member. Through holes for inserting bolts for use. And the radial direction length (height) of the said stationary side flange is enlarged in the part which formed each said screw hole (or through-hole) regarding the circumferential direction, and is made small in the other part. In other words, the radial length of the stationary flange is not uniform in the circumferential direction. In the case of such a wheel support bearing unit, the side surface of the stationary side flange is sandwiched between the maximum portion and the minimum portion of the radial length of the stationary side flange with respect to the radial direction of the stationary side flange. In the ring-shaped region, when the turning path with respect to the side surface of the stationary side flange is traced in the circumferential direction, the locations where the stationary side flange exists and the locations where the stationary side flange does not exist are alternately arranged. Accordingly, when turning the ring-shaped region of the side surface of the stationary side flange, the blade of the cutting tool cut into the side surface of the stationary side flange as the stationary side flange rotates. The state (contacted) and the state of not cutting (not contacting) are alternately repeated. In particular, in this case, when the side surface of the stationary side flange is a single plane, the blade of the cutting tool moves away from the side surface as the stationary side flange rotates, and then the side surface again. When riding on the blade, the blade of the cutting tool strongly hits the circumferential edge of the stationary flange, the portion of which the radial length is larger than the surrounding portion. And such a strong collision is repeated many times during the turning process. For this reason, there arises a disadvantage that the blade of the cutting tool is easily damaged.

そこで、この様な不都合が生じない様にすべく、上記静止側フランジの径方向長さが円周方向に関して不均一になっている車輪支持用軸受ユニットに対して本発明を実施する場合に、好ましくは、請求項3、8に記載した様に、少なくとも上記静止側フランジの側面に旋削加工を施す以前に、この側面のうちこの静止側フランジの径方向長さが周囲の部分に比べて大きくなっている部分に対応する部分の円周方向端部(上記旋削加工を行なう際の回転方向前端部)に、円周方向端縁に向かう程上記静止側フランジの反対側の側面に向かう方向に傾斜した傾斜面部を形成しておく。
この様な傾斜面部を設けておけば、上記静止側フランジの側面のうち上記円輪状の領域に旋削加工を施す際に、この静止側フランジが回転する事に伴い、この静止側フランジの側面から離れた切削工具の刃を、上記傾斜面部に初期接触させる態様で円滑に、再度上記静止側フランジの側面に接触させる事ができる。この様に、上記傾斜面部を設ければ、上記切削工具の刃と上記静止側フランジの大径部の円周方向端縁とが強くぶつかる事を防止できる。従って、この切削工具の刃が破損し易くなる事を有効に防止できると共に、上記静止側フランジの側面の加工精度を良好にできる。
Therefore, in order to prevent such inconvenience, when carrying out the present invention for a wheel support bearing unit in which the radial length of the stationary flange is non-uniform in the circumferential direction, Preferably, as described in claims 3 and 8, before turning at least the side surface of the stationary side flange, the radial length of the stationary side flange of the side surface is larger than the surrounding portion. In the direction toward the opposite side of the stationary flange toward the circumferential edge at the circumferential end of the part corresponding to the part that is formed (front end in the rotational direction when performing the turning) An inclined surface portion is formed in advance.
If such an inclined surface portion is provided, when turning to the ring-shaped region of the side surface of the stationary side flange, as the stationary side flange rotates, from the side surface of the stationary side flange, The blade of the separated cutting tool can be smoothly brought into contact with the side surface of the stationary flange again in such a manner that the blade comes into initial contact with the inclined surface portion. Thus, if the said inclined surface part is provided, it can prevent that the blade of the said cutting tool and the circumferential direction edge of the large diameter part of the said stationary side flange collide strongly. Accordingly, it is possible to effectively prevent the cutting tool blade from being easily damaged, and to improve the processing accuracy of the side surface of the stationary flange.

又、本発明は、請求項4、9に記載した様に、静止側フランジの径方向長さが円周方向に関して均一になっている車輪支持用軸受ユニットに対しても、実施する事ができる。
この様な車輪支持用軸受ユニットに対して本発明を実施する場合には、上記静止側フランジの側面に旋削加工を施す際に、切削加工の刃が、常にこの側面に切り込んだ(接触した)状態となる為、上述の様に切削工具の刃が破損し易くなると言った不都合が生じる事はない。
Further, as described in claims 4 and 9, the present invention can also be implemented for a wheel support bearing unit in which the radial length of the stationary flange is uniform in the circumferential direction. .
When the present invention is applied to such a wheel support bearing unit, the cutting blade is always cut into (contacted with) the side surface of the stationary flange when turning. Therefore, there is no inconvenience that the cutting tool blade is easily damaged as described above.

又、本発明を実施する場合には、静止側フランジの側面に旋削加工を施した後、この側面に細かいバリや突起が残る可能性がある。そして、この様なバリや突起が残ったまま、上記静止側フランジをナックルの側面に接触させて結合固定すると、上記バリや突起が起点となって、上記静止側フランジの側面に摩耗等の損傷が発生し易くなり、上記静止側フランジの耐久性が低下する事が懸念される。
そこで、この様な不都合が発生するのを防止すべく、本発明を実施する場合に、好ましくは、請求項5、10に記載した様に、上記静止側フランジの側面に旋削加工を施した後、この側面に表面硬化処理を施す。
この様にすれば、上記静止側フランジの側面に旋削加工を施した後、この側面に細かいバリや突起が残った場合でも、これらバリや突起を、上記表面硬化処理によるコーティング層により覆う事ができる共に、上記側面の硬度、耐摩耗性、耐食性を向上させる事ができる。従って、この側面に摩耗等の損傷が発生し、上記静止側フランジの耐久性が低下すると言った不都合が発生する事を防止できる。
When the present invention is carried out, fine burrs and protrusions may remain on the side surface after turning the side surface of the stationary flange. If the stationary flange is brought into contact with the side surface of the knuckle while such burrs and protrusions remain, and the burrs and protrusions are used as starting points, the side surface of the stationary flange is damaged by wear or the like. There is a concern that the durability of the stationary flange will be reduced.
Therefore, in order to prevent the occurrence of such inconvenience, when carrying out the present invention, preferably, as described in claims 5 and 10, after turning the side surface of the stationary flange, Then, the side surface is subjected to surface hardening treatment.
In this way, after turning the side surface of the stationary flange, even if fine burrs and protrusions remain on the side surface, these burrs and protrusions can be covered with the coating layer by the surface hardening treatment. At the same time, the hardness, wear resistance, and corrosion resistance of the side surfaces can be improved. Therefore, it is possible to prevent the occurrence of inconvenience that the side face is damaged such as wear and the durability of the stationary flange is lowered.

尚、上述の様に静止側フランジの側面に表面硬化処理を施す場合、好ましく採用できる表面硬化処理としては、Ti合金を初めとするセラミック系被膜材のコーティングや、ダイヤモンドライクカーボン(DLC)薄膜材のコーティング等が、実用的な表面硬化処理として挙げられる。即ち、近年改良されている、代表的な表面硬化処理として、TiN、TiCN、TiAlN、TiC、CrNやTiC/TiN、TiC/TiCN/Al23 、TiC/Al23 /TiN、TiC/TiCN/TiC/Al23 (多層コート)等のセラミック系被膜材のコーティングや、DLC薄膜材のコーティング等が挙げられる。TiN、TiCN、TiAlNやこれらの合金を基盤とした多層コート被膜等のTi合金系のコーティング膜は、高硬度、低摩擦性、及び強密着性を有しており、摩耗や傷が生じるのを防止する効果がある。この中で、特に、TiNやTiC/TiN多層コートの被膜は、摩耗や剥離を防止する効果に関して優れている。又、TiC/TiCN/Al23 、TiC/Al23 /TiN、TiC/TiCN/TiC/Al23 等の多層コート被膜は、耐摩耗性向上や凝着防止に関して優れている。又、DLC薄膜材によるコーティング膜は、耐摩耗性向上に関してTi合金を上回ると共に、コーティング処理の温度が通常200℃以下と、Ti合金等のコーティング処理温度よりも低い。この為、通常、軸受用に使用されるマルテンサイト系ステンレス鋼や高速度鋼に焼き入れ・焼き戻しを施して得られる硬度等の特性が、コーティング処理時の熱的影響により変化する事がないと言った長所を持つ。従って、設計に準じた軸受形状や軸受隙間、若しくはこれらに応じた軸受性能特性を維持できる。又、マルテンサイト系ステンレス鋼や高速度鋼の様な高合金鋼に適用可能である事も、軸受部材への適用に関する長所として挙げられる。 In addition, when surface hardening treatment is performed on the side surface of the stationary flange as described above, the surface hardening treatment that can be preferably employed includes coating of a ceramic-based coating material such as a Ti alloy, and a diamond-like carbon (DLC) thin film material. As a practical surface hardening treatment, the above coating or the like can be mentioned. That is, representative surface hardening treatments that have been improved in recent years include TiN, TiCN, TiAlN, TiC, CrN, TiC / TiN, TiC / TiCN / Al 2 O 3 , TiC / Al 2 O 3 / TiN, TiC / Examples thereof include coating with a ceramic coating material such as TiCN / TiC / Al 2 O 3 (multilayer coating), coating with a DLC thin film material, and the like. Ti alloy-based coating films such as TiN, TiCN, TiAlN, and multilayer coating films based on these alloys have high hardness, low friction, and strong adhesion, and are subject to wear and scratches. There is an effect to prevent. Among these, in particular, the coating of TiN or TiC / TiN multilayer coating is excellent with respect to the effect of preventing wear and peeling. In addition, multilayer coating films such as TiC / TiCN / Al 2 O 3 , TiC / Al 2 O 3 / TiN, TiC / TiCN / TiC / Al 2 O 3 are excellent in improving wear resistance and preventing adhesion. Moreover, the coating film by the DLC thin film material exceeds the Ti alloy in terms of improving the wear resistance, and the temperature of the coating treatment is usually 200 ° C. or lower, which is lower than the coating treatment temperature of the Ti alloy or the like. For this reason, properties such as hardness obtained by quenching and tempering martensitic stainless steel and high-speed steel, which are usually used for bearings, do not change due to thermal effects during coating treatment. Has the advantage of saying. Accordingly, it is possible to maintain the bearing shape and the bearing gap according to the design, or the bearing performance characteristics corresponding to these. Further, the fact that it can be applied to high alloy steels such as martensitic stainless steel and high speed steel is also cited as an advantage regarding application to bearing members.

図1〜4は、請求項1、2、3、5、6、7、8、10に対応する、本発明の実施例を示している。尚、本実施例の特徴は、主に、静止側部材である外輪6の外周面に形成した、静止側フランジである結合フランジ12の耐久性を向上させる為の製造方法にある。製造対象となる車輪支持用軸受ユニットに関し、当該製造方法によって面精度等を向上させた部分以外の部分の構造及び作用は、前述の図5〜6に示した車輪支持用軸受ユニットの場合とほぼ同様である。この為、重複する説明を省略若しくは簡略にし、以下、本実施例の特徴部分を中心に説明する。   1 to 4 show embodiments of the present invention corresponding to claims 1, 2, 3, 5, 6, 7, 8, 10. The feature of the present embodiment lies mainly in the manufacturing method for improving the durability of the coupling flange 12 that is the stationary side flange formed on the outer peripheral surface of the outer ring 6 that is the stationary side member. Regarding the wheel support bearing unit to be manufactured, the structure and operation of the parts other than the part whose surface accuracy is improved by the manufacturing method are almost the same as those of the wheel support bearing unit shown in FIGS. It is the same. For this reason, the overlapping description will be omitted or simplified, and the following description will focus on the features of this embodiment.

本実施例の場合には、先ず、車輪支持用軸受ユニットを構成する各部品同士を組み立てる前に、これら各部材に所定の熱処理を施す。又、上記外輪6に関しては、上記結合フランジ12の円周方向複数個所(図示の例では4個所)で、この結合フランジ12の径方向長さが周囲の部分に比べて大きくなっている各部分の径方向中間部に、それぞれねじ孔13、13を形成する。これと共に、上記結合フランジ12の内側面{車両への組み付け時にナックル3(図5参照)の側面を接触させる面}33のうち、この結合フランジ12の径方向長さが周囲の部分に比べて大きくなっている部分の円周方向端部(次述する旋削加工を行なう際の回転方向前端部)に、それぞれ円周方向端縁に向かう程上記結合フランジ12の外側面35に向かう方向に傾斜した傾斜面部26、26を、例えば面押し加工等により形成する。   In the case of the present embodiment, first, before assembling the parts constituting the wheel support bearing unit, these members are subjected to predetermined heat treatment. Further, with respect to the outer ring 6, each portion in which the radial length of the coupling flange 12 is larger than the surrounding portion at a plurality of circumferential positions (four in the illustrated example) of the coupling flange 12. Screw holes 13 and 13 are respectively formed in the intermediate portion in the radial direction. At the same time, the radial length of the coupling flange 12 in the inner side surface of the coupling flange 12 {the surface that contacts the side surface of the knuckle 3 (see FIG. 5) when assembled to the vehicle} is larger than that of the surrounding portion. Increasing in the direction toward the outer surface 35 of the coupling flange 12 toward the circumferential edge at the circumferential end of the enlarged portion (front end in the rotational direction when performing the turning process described below) The inclined surfaces 26 and 26 are formed by, for example, surface pressing.

その後、図3に示す様に、上記車輪支持用軸受ユニットを、使用時と同様の状態に組み立てる。そして、この車輪支持用軸受ユニットを構成する回転側部材であるハブ8を、チャック装置27により回転不能に支持した状態で、上記外輪6を、図示しない回転駆動手段により回転させる。そして、この様に外輪6を回転させながら、上記結合フランジ12の内側面33に旋削加工を施す。特に、本実施例の場合には、この旋削加工を施す際の基準面として、上記ハブ8を構成する取付フランジ15の外側面{車両への組み付け時に制動用回転部材2(図5参照)を当接させる面}34を採用している。この為に、具体的には、上記チャック装置27により上記ハブ8を回転不能に支持した状態で、このチャック装置27を構成する基台28の側面に設けた円輪状の支持平面29に、上記取付フランジ15の外側面34を、全周に亙り当接させている。そして、この状態で、上述の様に外輪6を回転させながら、図3〜4に示す様に、上記結合フランジ12の内側面33に切削工具30の刃31を接触させつつ、この刃31を上記支持平面29と平行に、この支持平面29の径方向に移動させる事により、上記結合フランジ12の内側面33に旋削加工を施す。この様にして旋削加工を施す事により、この旋削加工前にばらついていた上記結合フランジ12の内側面33の傾き及び平面度を改善し、この結合フランジ12の内側面33を、上記取付フランジ15の外側面34と平行で、且つ、平面度が良好な平面に仕上げる。   Then, as shown in FIG. 3, the said wheel support bearing unit is assembled in the same state as the time of use. Then, the outer ring 6 is rotated by a rotation driving means (not shown) in a state where the hub 8 which is a rotation side member constituting the wheel support bearing unit is supported by the chuck device 27 so as not to rotate. Then, the inner ring 33 of the coupling flange 12 is turned while rotating the outer ring 6 in this manner. In particular, in the case of this embodiment, the outer surface of the mounting flange 15 constituting the hub 8 {the braking rotating member 2 (see FIG. 5) when assembled to the vehicle) is used as a reference surface for the turning process. The surface to be contacted} 34 is employed. For this purpose, specifically, the above-mentioned hub 8 is supported by the chuck device 27 so as not to rotate, and a ring-shaped support plane 29 provided on the side surface of the base 28 constituting the chuck device 27 The outer surface 34 of the mounting flange 15 is brought into contact with the entire circumference. In this state, while rotating the outer ring 6 as described above, the blade 31 of the cutting tool 30 is brought into contact with the inner surface 33 of the coupling flange 12 as shown in FIGS. The inner surface 33 of the coupling flange 12 is turned by moving in the radial direction of the support plane 29 in parallel with the support plane 29. By performing the turning process in this way, the inclination and flatness of the inner side surface 33 of the coupling flange 12 which has been dispersed before the turning process is improved, and the inner side surface 33 of the coupling flange 12 is replaced with the mounting flange 15. The flat surface is finished in parallel with the outer side surface 34 and with good flatness.

尚、上記結合フランジ12の内側面33のうち、この結合フランジ12の径方向に関し、この結合フランジ12の径方向長さの極大部と極小部との間に挟まれた円輪状の領域では、上記内側面33に対する旋削経路を円周方向にたどると、上記結合フランジ12が存在する個所と存在しない個所とが、交互に並んだ状態になっている。従って、上記内側面33のうち上記円輪状の領域に旋削加工を施す場合には、上記結合フランジ12が回転する事に伴い、上記切削工具30の刃31が上記内側面33に切り込んだ(接触した)状態と切り込まない(接触しない)状態とが交互に繰り返される。但し、本実施例の場合、上記内側面33のうち、上記結合フランジ12の径方向長さが周囲の部分に比べて大きくなっている各部分の円周方向端部(回転方向前端部)に、それぞれ前述した様な傾斜面部26、26を形成している。この為、上記内側面33のうち上記円輪状の領域に旋削加工を施す際には、上記結合フランジ12が回転する事に伴い、上記内側面33から離れた上記刃31を、上記各傾斜面部26、26に初期接触させる態様で円滑に、再度上記内側面33に接触させる事ができる。従って、上記旋削加工時に、上記刃31と上記結合フランジ12の大径部の円周方向端縁とが強くぶつかる事を防止できる。この結果、上記刃31が破損し易くなる事を有効に防止できると共に、上記内側面33の加工精度を良好にできる。尚、図示は省略するが、この内側面33のうち、前記各ねじ孔13、13の内端開口周縁部に、これら各ねじ孔13、13の中心部に向かう程上記結合フランジ12の外側面35に向かう方向に傾斜する傾斜面部を設ける事もできる。この様な傾斜面部を設ければ、上記内側面33の旋削加工時に、上記刃31が上記各ねじ孔13、13の内端部内周縁に強くぶつかる事を防止できる。   Of the inner side surface 33 of the coupling flange 12, with respect to the radial direction of the coupling flange 12, an annular region sandwiched between the maximum portion and the minimum portion of the radial length of the coupling flange 12, When the turning path with respect to the inner side surface 33 is traced in the circumferential direction, the locations where the coupling flanges 12 are present and the locations where the coupling flanges 12 are not present are alternately arranged. Accordingly, when turning the annular region of the inner side surface 33, the blade 31 of the cutting tool 30 is cut into the inner side surface 33 (contact) as the coupling flange 12 rotates. And the state of not cutting (contacting) are alternately repeated. However, in the case of the present embodiment, of the inner side surface 33, at the circumferential end portion (rotation direction front end portion) of each portion where the radial length of the coupling flange 12 is larger than the surrounding portion. The inclined surface portions 26 and 26 as described above are formed. Therefore, when turning the annular region of the inner side surface 33, the blade 31 separated from the inner side surface 33 is moved to the inclined surface portions as the coupling flange 12 rotates. 26 and 26 can be brought into contact with the inner side surface 33 again smoothly in such a manner as to be initially contacted. Therefore, it is possible to prevent the blade 31 and the circumferential edge of the large-diameter portion of the coupling flange 12 from strongly colliding during the turning process. As a result, it is possible to effectively prevent the blade 31 from being easily damaged, and to improve the processing accuracy of the inner surface 33. In addition, although illustration is omitted, of the inner side surface 33, the outer side surface of the coupling flange 12 is closer to the inner peripheral edge of the inner end opening of each screw hole 13, 13 toward the center of each screw hole 13, 13. An inclined surface portion that is inclined in a direction toward 35 can also be provided. By providing such an inclined surface portion, it is possible to prevent the blade 31 from strikingly hitting the inner peripheral edge of the inner end portion of each of the screw holes 13 and 13 when the inner surface 33 is turned.

又、本実施例の場合、上述の様に結合フランジ12の内側面33に旋削加工を施す際には、この内側面33に対する上記刃31の接触力を考慮して、加工時の上記ハブ8と上記外輪6との中心軸同士の傾きが適正範囲内に収まる(上記接触力で、この外輪6が上記ハブ8に対し傾斜しない)様に、上記内側面33に対する上記刃31の切り込み量や送り速度等の加工条件を設定するのが望ましい。又、上記切削工具30を取り付けた図示しない支持台を、上記支持平面29に対して精度良く平行移動させられる様にするのが望ましい。更に、上述した内側面33の旋削加工が完了した時点で、この内側面33に形成した上記各傾斜面部26、26の大部分が削り取られて他の部分と単一の平面になる様に、これら各傾斜面部26、26の寸法と上記刃31の切り込み量との関係を規制するのが好ましい。   In the case of the present embodiment, when turning the inner side surface 33 of the coupling flange 12 as described above, the contact force of the blade 31 with respect to the inner side surface 33 is taken into consideration, and the hub 8 at the time of machining is taken into account. And the outer ring 6 so that the inclination of the central axes is within an appropriate range (the outer ring 6 is not inclined with respect to the hub 8 by the contact force), It is desirable to set processing conditions such as feed rate. In addition, it is desirable that a support base (not shown) to which the cutting tool 30 is attached can be accurately translated with respect to the support plane 29. Furthermore, when the turning of the inner side surface 33 described above is completed, most of the inclined surface portions 26, 26 formed on the inner side surface 33 are scraped off to become a single plane with the other portions. It is preferable to regulate the relationship between the dimensions of the inclined surface portions 26 and 26 and the cutting amount of the blade 31.

上述の様な結合フランジ12の内側面33の旋削加工が完了したならば、次いで、この内側面33に、例えばセラミック系被膜材のコーティングやDLC薄膜材のコーティング等の各種の表面硬化処理の中から選択される、何れかの表面硬化処理を施す。   When the turning process of the inner side surface 33 of the coupling flange 12 as described above is completed, the inner side surface 33 is then subjected to various surface hardening treatments such as coating with a ceramic coating material and coating with a DLC thin film material. Any surface curing treatment selected from the above is performed.

上述した様に、本実施例の車輪支持用軸受ユニット及びその製造方法によれば、車輪支持用軸受ユニットの完成後の状態で、結合フランジ12の内側面33の平面度を良好にできる。この為、車輪支持用軸受ユニットを車体に組み付けた状態で、上記内側面33とナックル3の側面32との接触状態を、全体的に均一にする事ができる。従って、ボルト7(図5参照)の緊締力や自動車の走行時に発生する各種荷重を、それぞれ上記両側面32、33同士の接触部の全体若しくは広い範囲で均一に受ける事ができ、これら両側面32、33同士の接触面圧が局部的に大きくなる事を防止できる。この結果、上記結合フランジ12の負荷条件を緩和する事ができる。又、上述した様に、本実施例の場合には、上記結合フランジ12の内側面33を、取付フランジ15の外側面34と平行な面にできる。この為、自動車の運転時に、この取付フランジ15の外側面34の回転振れを抑える事ができる。従って、この外側面34に取り付ける制動用回転部材2(及び車輪)の回転振れを抑える事ができる。この結果、その分だけ、上記結合フランジ12の負荷条件を更に緩和する事ができる。この様に、本実施例の場合には、上記結合フランジ12の負荷条件を緩和する事ができる為、この結合フランジ12の耐久性を向上させる事ができる。   As described above, according to the wheel support bearing unit and the manufacturing method thereof according to this embodiment, the flatness of the inner side surface 33 of the coupling flange 12 can be improved in a state after the wheel support bearing unit is completed. For this reason, the contact state between the inner side surface 33 and the side surface 32 of the knuckle 3 can be made uniform as a whole with the wheel support bearing unit assembled to the vehicle body. Accordingly, the tightening force of the bolt 7 (see FIG. 5) and various loads generated during the traveling of the vehicle can be uniformly received over the entire contact area between the side surfaces 32 and 33 or over a wide range. It is possible to prevent the contact surface pressure between 32 and 33 from locally increasing. As a result, the load condition of the coupling flange 12 can be relaxed. Further, as described above, in the case of this embodiment, the inner side surface 33 of the coupling flange 12 can be parallel to the outer side surface 34 of the mounting flange 15. For this reason, it is possible to suppress rotational runout of the outer side surface 34 of the mounting flange 15 during driving of the automobile. Therefore, it is possible to suppress the rotational shake of the braking rotary member 2 (and the wheels) attached to the outer side surface 34. As a result, the load condition of the coupling flange 12 can be further relaxed accordingly. Thus, in the case of the present embodiment, the load condition of the coupling flange 12 can be relaxed, so that the durability of the coupling flange 12 can be improved.

又、上述した様に、本実施例の場合には、上記結合フランジ12の内側面33に旋削加工を施した後、この内側面33に表面硬化処理を施している。この為、この旋削加工によって、この内側面33に細かいバリや突起が残った場合でも、これらバリや突起を、上記表面硬化処理によるコーティング層により覆う事ができる共に、上記内側面33の硬度、耐摩耗性、耐食性を向上させる事ができる。従って、上記結合フランジ12を上記ナックル3に結合した状態での使用時に、上記バリや突起を起点として、上記結合フランジ12の内側面33に摩耗等の損傷が発生し、この結合フランジ12の耐久性が低下すると言った不都合が発生する事を防止できる。   Further, as described above, in the case of the present embodiment, the inner side surface 33 of the coupling flange 12 is turned and then the inner side surface 33 is subjected to surface hardening treatment. For this reason, even if fine burrs and protrusions remain on the inner surface 33 by this turning process, these burrs and protrusions can be covered with the coating layer by the surface hardening treatment, and the hardness of the inner surface 33, Abrasion resistance and corrosion resistance can be improved. Accordingly, when the connecting flange 12 is used in a state where it is connected to the knuckle 3, the inner surface 33 of the connecting flange 12 is damaged from wear, starting from the burrs and protrusions, and the durability of the connecting flange 12 is increased. It is possible to prevent the occurrence of inconveniences such as deterioration in performance.

尚、上述した実施例では、車輪支持用軸受ユニットを組み立てた後、結合フランジ12の内側面33にのみ、旋削加工を施した。但し、前述の図9に示した構造の様に、結合フランジ12の外側面35にボルト7の頭部25の側面を接触させる構造に対して本発明を実施する場合に、好ましくは、上記外側面35にも、上記内側面33の場合と同様の条件で旋削加工を施す。これにより、この外側面35の平面度を向上させ、この外側面35と上記頭部25の側面との接触状態を均一にできる様にする。又、より好ましくは、外輪6の外周面のうち、上記結合フランジ12の軸方向内側に隣接する部分に設けた円筒面部36にも、上記内側面33と同様の条件で旋削加工を施す。これにより、この円筒面部36の面精度を向上させ、この円筒面部とナックル3の内周面との接触状態を均一にできる様にする。   In the above-described embodiment, after assembling the wheel supporting bearing unit, only the inner surface 33 of the coupling flange 12 was turned. However, when the present invention is applied to a structure in which the side surface of the head portion 25 of the bolt 7 is brought into contact with the outer side surface 35 of the coupling flange 12 as in the structure shown in FIG. The side surface 35 is also turned under the same conditions as those for the inner side surface 33. Thereby, the flatness of the outer surface 35 is improved, and the contact state between the outer surface 35 and the side surface of the head 25 can be made uniform. More preferably, the cylindrical surface portion 36 provided on the outer peripheral surface of the outer ring 6 adjacent to the inner side in the axial direction of the coupling flange 12 is also turned under the same conditions as the inner surface 33. Thereby, the surface accuracy of the cylindrical surface portion 36 is improved, and the contact state between the cylindrical surface portion and the inner peripheral surface of the knuckle 3 can be made uniform.

又、本発明は、上述した実施例で示した車輪支持用軸受ユニットに限らず、例えば前述の図7〜8に示した各車輪支持用軸受ユニット等、特許請求の範囲に記載した要件を満たす総ての車輪支持用軸受ユニットに対して適用できる。   Further, the present invention is not limited to the wheel support bearing unit shown in the above-described embodiment, but satisfies the requirements described in the claims, for example, each wheel support bearing unit shown in FIGS. Applicable to all wheel support bearing units.

本発明の実施例を示す、外輪を軸方向内側から見た図。The figure which looked at the outer ring | wheel from the axial direction inner side which shows the Example of this invention. 図1のA−A断面を拡大して示す図。The figure which expands and shows the AA cross section of FIG. 車輪支持用軸受ユニットを組み立てた状態で、結合フランジの内側面に旋削加工を施す状態を示す断面図。Sectional drawing which shows the state which turns in the inner surface of a coupling flange in the state which assembled the wheel support bearing unit. 図3のB部拡大図。The B section enlarged view of FIG. 車輪支持用軸受ユニットの従来構造の第1例を、車体に取り付けた状態で示す断面図。Sectional drawing which shows the 1st example of the conventional structure of the bearing unit for wheel support in the state attached to the vehicle body. 外輪を軸方向内側から見た図。The figure which looked at the outer ring from the axial direction inner side. 車輪支持用軸受ユニットの従来構造の第2例を示す断面図。Sectional drawing which shows the 2nd example of the conventional structure of the bearing unit for wheel support. 同第3例を示す断面図。Sectional drawing which shows the 3rd example. 結合フランジとナックルとの結合部の構造の別例を示す断面図。Sectional drawing which shows another example of the structure of the coupling | bond part of a coupling flange and a knuckle.

符号の説明Explanation of symbols

1 ホイール
2 制動用回転部材
3 ナックル
4、4a、4b 車輪支持用軸受ユニット
5 支持孔
6、6a 外輪
7 ボルト
8、8a ハブ
9 スタッド
10 ナット
11a、11b 外輪軌道
12 結合フランジ
13 ねじ孔
14 通孔
15 取付フランジ
16a、16b 内輪軌道
17 小径段部
18 内輪
19 玉
20 かしめ部
21 スプライン孔
22 等速ジョイント
23 スプライン軸
24 軸部材
25 頭部
26 傾斜面部
27 チャック装置
28 基台
29 支持平面
30 切削工具
31 刃
32 側面
33 内側面
34 外側面
35 外側面
36 円筒面部
DESCRIPTION OF SYMBOLS 1 Wheel 2 Braking rotation member 3 Knuckle 4, 4a, 4b Wheel support bearing unit 5 Support hole 6, 6a Outer ring 7 Bolt 8, 8a Hub 9 Stud 10 Nut 11a, 11b Outer ring track 12 Connection flange 13 Screw hole 14 Through hole DESCRIPTION OF SYMBOLS 15 Mounting flange 16a, 16b Inner ring raceway 17 Small diameter step part 18 Inner ring 19 Ball 20 Caulking part 21 Spline hole 22 Constant velocity joint 23 Spline shaft 24 Shaft member 25 Head 26 Inclined surface part 27 Chuck device 28 Base 29 Support plane 30 Cutting tool 31 blade 32 side surface 33 inner surface 34 outer surface 35 outer surface 36 cylindrical surface portion

Claims (10)

静止側周面に静止側軌道を、外周面に懸架装置を構成するナックルに結合固定する為の静止側フランジを、それぞれ有し、使用時にも回転しない静止側部材と、回転側周面に回転側軌道を、外周面に車輪及び制動用回転部材を支持固定する為の回転側フランジを、それぞれ有し、使用時に上記車輪及び制動用回転部材と共に回転する回転側部材と、上記静止側軌道と上記回転側軌道との間に転動自在に設けられた複数個の転動体とを備えた車輪支持用軸受ユニットに於いて、上記静止側部材と上記回転側部材と上記各転動体とを使用時の状態に組み立てた後、この回転側部材を回転不能に支持した状態で、上記静止側部材を回転させながら、上記静止側フランジの側面に旋削加工を施す事により、この側面の平面度を向上させている事を特徴とする車輪支持用軸受ユニット。   The stationary side track has a stationary side track and the outer circumferential surface has a stationary side flange for coupling and fixing to the knuckle that constitutes the suspension device. The stationary side member does not rotate during use, and the rotating side circumferential surface rotates. A rotation-side member having a side track, a rotation-side flange for supporting and fixing the wheel and the brake rotation member on the outer peripheral surface, and rotating together with the wheel and the brake rotation member when in use; and the stationary track In a wheel support bearing unit comprising a plurality of rolling elements provided in a freely rolling manner between the rotating side track and the rotating side member, the stationary side member, the rotating side member, and the rolling elements are used. After assembling to the state of time, turning the stationary side member while turning the stationary side member in a non-rotatable manner, turning the side surface of the stationary side flange allows the flatness of the side surface to be increased. It is characterized by improving Wheel supporting bearing unit to be. 制動用回転部材の側面を当接させる面である、回転側フランジの片側面を基準面として、静止側フランジの側面に旋削加工を施す事により、この静止側フランジの側面を上記回転側フランジの片側面と平行な面に仕上げている、請求項1に記載した車輪支持用軸受ユニット。   By turning the side surface of the stationary side flange with the one side surface of the rotating side flange, which is the surface that contacts the side surface of the rotating member for braking, as a reference surface, the side surface of the stationary side flange is The wheel support bearing unit according to claim 1, wherein the wheel support bearing unit is finished in a plane parallel to one side. 静止側フランジの径方向長さが円周方向に関して不均一になっており、且つ、少なくともこの静止側フランジの側面に旋削加工を施す以前の状態で、この側面のうちこの静止側フランジの径方向長さが周囲の部分に比べて大きくなっている部分に対応する部分の円周方向端部に、円周方向端縁に向かう程上記静止側フランジの反対側の側面に向かう方向に傾斜した傾斜面部を形成している、請求項1〜2のうちの何れか1項に記載した車輪支持用軸受ユニット。   The radial length of the stationary side flange is uneven in the circumferential direction, and at least before the turning of the side surface of the stationary side flange, the radial direction of the stationary side flange of this side surface Inclined in the direction toward the opposite side of the stationary flange toward the circumferential edge at the circumferential end of the portion corresponding to the portion whose length is larger than the surrounding portion The bearing unit for wheel support described in any one of Claims 1-2 which forms the surface part. 静止側フランジの径方向長さが円周方向に関して均一になっている、請求項1〜2のうちの何れか1項に記載した車輪支持用軸受ユニット。   The wheel support bearing unit according to any one of claims 1 to 2, wherein the radial length of the stationary side flange is uniform in the circumferential direction. 静止側フランジの側面に旋削加工を施した後、この側面に表面硬化処理を施している、請求項1〜4のうちの何れか1項に記載した車輪支持用軸受ユニット。   The wheel-supporting bearing unit according to any one of claims 1 to 4, wherein the side surface of the stationary side flange is turned and then the side surface is subjected to surface hardening treatment. 静止側周面に静止側軌道を、外周面に懸架装置を構成するナックルに結合固定する為の静止側フランジを、それぞれ有し、使用時にも回転しない静止側部材と、回転側周面に回転側軌道を、外周面に車輪及び制動用回転部材を支持固定する為の回転側フランジを、それぞれ有し、使用時に上記車輪及び制動用回転部材と共に回転する回転側部材と、上記静止側軌道と上記回転側軌道との間に転動自在に設けられた複数個の転動体とを備えた車輪支持用軸受ユニットの製造方法であって、上記静止側部材と上記回転側部材と上記各転動体とを使用時の状態に組み立てた後、この回転側部材を回転不能に支持した状態で、上記静止側部材を回転させながら、上記静止側フランジの側面に旋削加工を施す事により、この側面の平面度を向上させる、車輪支持用軸受ユニットの製造方法。   The stationary side track has a stationary side track and the outer circumferential surface has a stationary side flange for coupling and fixing to the knuckle that constitutes the suspension device. The stationary side member does not rotate during use, and the rotating side circumferential surface rotates. A rotation-side member having a side track, a rotation-side flange for supporting and fixing the wheel and the brake rotation member on the outer peripheral surface, and rotating together with the wheel and the brake rotation member when in use; and the stationary track A method of manufacturing a wheel-supporting bearing unit comprising a plurality of rolling elements provided in a freely rotatable manner between the rotating side track and the stationary side member, the rotating side member, and the rolling elements. And rotating the stationary side member while turning the stationary side member in a state in which the rotating side member is supported in a non-rotatable state. Improve flatness, Method of manufacturing a wheel supporting bearing unit. 制動用回転部材の側面を当接させる面である、回転側フランジの片側面を基準面として、静止側フランジの側面に旋削加工を施す事により、この静止側フランジの側面を上記回転側フランジの片側面と平行な面に仕上げる、請求項6に記載した車輪支持用軸受ユニットの製造方法。   By turning the side surface of the stationary side flange with the one side surface of the rotating side flange, which is the surface that contacts the side surface of the rotating member for braking, as a reference surface, the side surface of the stationary side flange is The manufacturing method of the wheel-supporting bearing unit according to claim 6, wherein the wheel support bearing unit is finished to a surface parallel to one side surface. 対象となる車輪支持用軸受ユニットを構成する静止側フランジの径方向長さが円周方向に関して不均一になっており、且つ、少なくともこの静止側フランジの側面に旋削加工を施す以前に、この側面のうちこの静止側フランジの径方向長さが周囲の部分に比べて大きくなっている部分に対応する部分の円周方向端部に、円周方向端縁に向かう程上記静止側フランジの反対側の側面に向かう方向に傾斜した傾斜面部を形成しておく、請求項6〜7のうちの何れか1項に記載した車輪支持用軸受ユニットの製造方法。   The radial length of the stationary flange that constitutes the target wheel support bearing unit is non-uniform in the circumferential direction, and at least before this side surface of the stationary flange is turned, Of the stationary side flange, the portion corresponding to the portion where the radial length of the stationary side flange is larger than that of the surrounding portion, and the opposite side of the stationary side flange toward the circumferential edge The manufacturing method of the bearing unit for wheel support described in any one of Claims 6-7 which forms the inclined surface part inclined in the direction which goes to the side surface of this. 対象となる車輪支持用軸受ユニットを構成する静止側フランジの径方向長さが円周方向に関して均一になっている、請求項6〜7のうちの何れか1項に記載した車輪支持用軸受ユニットの製造方法。   The wheel support bearing unit according to any one of claims 6 to 7, wherein a radial length of a stationary side flange constituting a target wheel support bearing unit is uniform in a circumferential direction. Manufacturing method. 静止側フランジの側面に旋削加工を施した後、この側面に表面硬化処理を施す、請求項5〜8のうちの何れか1項に記載した車輪支持用軸受ユニットの製造方法。   The method for manufacturing a wheel-supporting bearing unit according to any one of claims 5 to 8, wherein the side surface of the stationary side flange is turned and then subjected to surface hardening treatment.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008090746A1 (en) * 2007-01-25 2008-07-31 Ntn Corporation Rotation speed detector-equipped bearing for wheel
JP2012224157A (en) * 2011-04-18 2012-11-15 Jtekt Corp Bearing device for vehicle
CN107360728A (en) * 2015-03-12 2017-11-17 Ntn株式会社 It is combined with the wheel bearing arrangement of wheel speed detector

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008090746A1 (en) * 2007-01-25 2008-07-31 Ntn Corporation Rotation speed detector-equipped bearing for wheel
US8043010B2 (en) 2007-01-25 2011-10-25 Ntn Corporation Wheel bearing apparatus incorporated with a wheel speed detecting apparatus
JP2012224157A (en) * 2011-04-18 2012-11-15 Jtekt Corp Bearing device for vehicle
CN107360728A (en) * 2015-03-12 2017-11-17 Ntn株式会社 It is combined with the wheel bearing arrangement of wheel speed detector
CN107360728B (en) * 2015-03-12 2020-03-03 Ntn株式会社 Wheel bearing device incorporating wheel speed detecting device

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