JP4186959B2 - Rolling bearing unit for wheel support - Google Patents

Rolling bearing unit for wheel support Download PDF

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JP4186959B2
JP4186959B2 JP2005177772A JP2005177772A JP4186959B2 JP 4186959 B2 JP4186959 B2 JP 4186959B2 JP 2005177772 A JP2005177772 A JP 2005177772A JP 2005177772 A JP2005177772 A JP 2005177772A JP 4186959 B2 JP4186959 B2 JP 4186959B2
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inner ring
hub
peripheral surface
raceway
bearing unit
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JP2005291501A (en
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善久 大貫
裕也 宮崎
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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
    • 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
    • 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Rolling Contact Bearings (AREA)

Description

この発明に係る車輪支持用転がり軸受ユニットは、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利用する。   The wheel support rolling bearing unit according to the present invention is used for rotatably supporting the wheel of an automobile with respect to a suspension device.

自動車の車輪は、車輪支持用転がり軸受ユニットにより懸架装置に支持する。この様な場合に使用する車輪支持用転がり軸受ユニットとして、従来から例えば、特許文献１〜８等に記載されたものが知られている。又、図５は、従来から広く実施されている車輪支持用転がり軸受ユニットの１例を示している。この車輪支持用転がり軸受ユニット１は、ハブ２と、内輪３と、外輪４と、複数個の転動体５、５とを備える。このうちのハブ２の外周面の、請求項に記載した一端部に対応する、外端部（外とは、自動車への組み付け状態で幅方向外寄りとなる側を言い、各図の左側となる。反対に幅方向中央寄りとなる側を内と言い、各図の右側となる。）で上記外輪４から突出した部分には、車輪を支持する為の第一のフランジ６を形成している。又、このハブ２の中間部外周面には第一の内輪軌道７を、同じく、請求項に記載した他端部に対応する、内端部には外径寸法が小さくなった段部８を、それぞれ形成している。 The wheels of the automobile are supported on the suspension device by a rolling bearing unit for supporting the wheels. As wheel support rolling bearing units used in such a case, those described in, for example, Patent Documents 1 to 8 have been known. FIG. 5 shows an example of a wheel bearing rolling bearing unit that has been widely used in the past. The wheel support rolling bearing unit 1 includes a hub 2, an inner ring 3, an outer ring 4, and a plurality of rolling elements 5 and 5. Outer end portion of the outer peripheral surface of the hub 2 corresponding to one end portion described in the claims (outside means the side that is outward in the width direction in the assembled state to the automobile, and the left side of each figure) On the other hand, the side closer to the center in the width direction is referred to as the inner side, and is the right side of each figure.) The first flange 6 for supporting the wheel is formed on the portion protruding from the outer ring 4 in FIG. Yes. Further, the first inner ring raceway 7 is provided on the outer peripheral surface of the intermediate portion of the hub 2, and the step portion 8 having a smaller outer diameter is provided on the inner end portion corresponding to the other end portion recited in the claims. , Each formed.

そして、この段部８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。上記ハブ２の内端部には雄ねじ部１０を形成し、この雄ねじ部１０の先端部を、上記内輪３の内端面よりも内方に突出させている。そして、この雄ねじ部１０に螺合したナット１１と上記段部８の段差面１２との間で上記内輪３を挟持する事により、この内輪３を上記ハブ２の所定位置に結合固定している。上記雄ねじ部１０の先端部外周面には係止凹部１７を形成している。そして、上記ナット１１を所定のトルクで緊締した後、このナット１１の一部で上記係止凹部１７に整合する部分を直径方向内方にかしめ付ける事により、このナット１１の緩み止めを図っている。尚、上記ハブ２に１対の内輪を外嵌し、これら１対の内輪の外周面に、第一、第二の内輪軌道７、９を設ける構造も、従来から知られている。 And the said inner ring | wheel 3 which formed the 2nd inner ring raceway 9 in the outer peripheral surface at this step part 8 is externally fitted. A male screw portion 10 is formed at the inner end portion of the hub 2, and the tip end portion of the male screw portion 10 protrudes inward from the inner end surface of the inner ring 3. The inner ring 3 is clamped and fixed to a predetermined position of the hub 2 by sandwiching the inner ring 3 between a nut 11 screwed into the male threaded portion 10 and a stepped surface 12 of the stepped portion 8. . A locking recess 17 is formed on the outer peripheral surface of the distal end portion of the male screw portion 10. Then, after tightening the nut 11 with a predetermined torque, a portion of the nut 11 that is aligned with the locking recess 17 is caulked inward in the diametrical direction to prevent the nut 11 from loosening. Yes. A structure in which a pair of inner rings are externally fitted to the hub 2 and first and second inner ring raceways 7 and 9 are provided on the outer peripheral surfaces of the pair of inner rings is conventionally known.

又、上記外輪４の内周面には、上記第一の内輪軌道７と対向する第一の外輪軌道１３及び上記第二の内輪軌道９に対向する第二の外輪軌道１４を形成している。そして、これら第一、第二の内輪軌道７、９と第一、第二の外輪軌道１３、１４との間に上記転動体５、５を、それぞれ複数個ずつ設けている。これら各転動体５、５の設置空間の外端開口はシールリング２２により、内端開口は蓋体２９により、それぞれ塞いでいる。尚、図示の例では、転動体５、５として玉を使用しているが、重量の嵩む自動車用の車輪支持用転がり軸受ユニットの場合には、これら転動体としてテーパころを使用する場合もある。   A first outer ring raceway 13 facing the first inner ring raceway 7 and a second outer ring raceway 14 facing the second inner ring raceway 9 are formed on the inner peripheral surface of the outer ring 4. . A plurality of rolling elements 5 and 5 are provided between the first and second inner ring raceways 7 and 9 and the first and second outer ring raceways 13 and 14, respectively. The outer end openings of the installation spaces of the rolling elements 5 and 5 are closed by the seal ring 22, and the inner end openings are closed by the lid 29. In the illustrated example, balls are used as the rolling elements 5 and 5. However, in the case of a rolling bearing unit for supporting a wheel for an automobile having a heavy weight, tapered rollers may be used as these rolling elements. .

上述の様な車輪支持用転がり軸受ユニット１を自動車に組み付けるには、上記外輪４を、その外周面の一部に形成した第二のフランジ１５により懸架装置に固定し、上記第一のフランジ６に車輪を固定する。この結果、この車輪が懸架装置に対して回転自在に支持される。 In order to assemble the wheel-supporting rolling bearing unit 1 as described above to an automobile, the outer ring 4 is fixed to a suspension device by a second flange 15 formed on a part of the outer peripheral surface thereof, and the first flange 6 is Secure the wheels to the As a result, this wheel is rotatably supported with respect to the suspension device.

又、前記特許文献７には、図６に示す様な構造の車輪支持用転がり軸受ユニット１が記載されている。この従来構造の第２例の場合には、ハブ２の、請求項に記載した他端部に対応する、内端部に形成した円筒部の一部で内輪３の内端面よりも内方に突出した部分を直径方向外方に折り曲げる事により、かしめ部１６を形成している。そして、このかしめ部１６と段部８の段差面１２との間で、上記内輪３を挟持している。 Patent Document 7 describes a wheel support rolling bearing unit 1 having a structure as shown in FIG . In the case of the second example of the conventional structure, a part of the cylindrical portion formed at the inner end corresponding to the other end of the hub 2 is inward of the inner end surface of the inner ring 3. The caulking portion 16 is formed by bending the protruding portion outward in the diameter direction. The inner ring 3 is sandwiched between the caulking portion 16 and the step surface 12 of the step portion 8.

図５に示した従来構造の第１例の場合には、雄ねじ部１０の先端部に係止凹部１７を形成する作業、及びナット１１の一部を直径方向内方にかしめ付ける作業が必要になる。この為、車輪支持用転がり軸受ユニット１の部品製造作業及び組立作業が面倒になり、コストが嵩む。 In the case of the first example of the conventional structure shown in FIG. 5 , it is necessary to perform the operation of forming the locking recess 17 at the tip of the male screw portion 10 and the operation of caulking a part of the nut 11 inward in the diameter direction. Become. For this reason, the parts manufacturing work and assembling work of the wheel bearing rolling bearing unit 1 become troublesome, and the cost increases.

特開昭６３−１０６４２６号公報JP 63-106426 A 特開昭６３−１８４５０１号公報Japanese Unexamined Patent Publication No. 63-184501 特開昭６２−２１４８８９号公報JP-A-62-214889 特開平３−３１００１号公報JP-A-3-31001 米国特許第４５３７２７０号明細書US Pat. No. 4,537,270 米国特許第４９５８９４４号明細書US Pat. No. 4,958,944 米国特許第５２２６７３８号明細書US Pat. No. 5,226,738 米国特許第５４９０７３２号明細書US Pat. No. 5,490,732

本発明の車輪支持用転がり軸受ユニットは、この様な事情に鑑みて、ハブに対し内輪を固定するナットの緩み止めを図る為の係止凹部の形成作業やナットのかしめ付け作業を省略する事により、コスト低減を図る事を目的に発明したものである。 In view of such circumstances, the wheel bearing rolling bearing unit according to the present invention eliminates the operation of forming a locking recess and the caulking operation of the nut to prevent loosening of the nut that fixes the inner ring to the hub. Thus, the invention was invented for the purpose of reducing the cost.

本発明の車輪支持用転がり軸受ユニットは、従来の車輪支持用転がり軸受ユニットと同様に、一端部外周面に第一のフランジを、中間部外周面に直接又は別体の内輪を介して第一の内輪軌道を、それぞれ設けたハブと、このハブの他端部に形成された、上記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段部と、外周面に第二の内輪軌道を形成して上記段部に外嵌した内輪と、外周面に第二のフランジを、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、それぞれ形成した外輪と、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た転動体とを備える。そして、上記ハブの他端部で少なくとも上記段部に外嵌した内輪よりも突出した部分に形成した円筒部を直径方向外方にかしめ広げる事で形成したかしめ部により、上記段部に外嵌した内輪をこの段部の段差面に向け抑え付けて、この段部に外嵌した内輪を上記ハブに結合固定している。
特に、本発明の車輪支持用転がり軸受ユニットに於いては、上記円筒部の外周面は、上記段差面側が大径で、この円筒部の先端縁側がこの先端縁に対応する端縁も含めて小径になっている。 The wheel-supporting rolling bearing unit of the present invention is similar to the conventional wheel-supporting rolling bearing unit in that the first flange is provided on the outer peripheral surface of one end, and the first flange is provided directly on the outer peripheral surface of the intermediate portion or via a separate inner ring. The inner ring raceway is provided with a hub, a step portion formed at the other end of the hub and having a smaller outer diameter than the portion where the first inner ring raceway is formed, and a second outer peripheral surface. An inner ring that is externally fitted to the stepped portion, a second flange on the outer peripheral surface, a first outer ring race that faces the first inner ring raceway, and the second inner ring on the inner peripheral surface. a second outer raceway opposed to the raceway, an outer ring formed respectively, the first, second inner ring raceway and the first, between the second outer raceway, and rolling elements provided by a plurality respectively Is provided. Then, by caulking portion formed by Ru spread caulking a cylindrical portion formed on the projecting portion than an outer fitting the inner ring diametrically outward to at least the stepped portion at the other end portion of the hub, outside the stepped portion The fitted inner ring is pressed against the step surface of the step portion, and the inner ring fitted on the step portion is coupled and fixed to the hub .
In particular, in the rolling bearing unit for supporting a wheel according to the present invention, the outer peripheral surface of the cylindrical portion has a large diameter on the stepped surface side, and the tip edge side of the cylindrical portion includes the edge corresponding to the tip edge. It has a small diameter.

上述の様に構成される本発明の車輪支持用転がり軸受ユニットにより、懸架装置に対して車輪を回転自在に支持する作用は、従来の車輪支持用転がり軸受ユニットと同様である。
［参考例１］ The operation of rotatably supporting the wheel with respect to the suspension device by the wheel supporting rolling bearing unit of the present invention configured as described above is the same as that of the conventional wheel supporting rolling bearing unit .
[Reference Example 1]

図１〜２は、本発明に関する参考例の第１例を示している。尚、本例の特徴は、ハブ２に対して内輪３を固定する部分の構造にある。その他の部分の構造及び作用に就いては、前述の図５に示した従来構造と同様であるから、重複する説明を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 a first example of a reference example related to the present invention . The feature of this example is the structure of the portion for fixing the inner ring 3 to the hub 2. Since the structure and operation of the other parts are the same as those of the conventional structure shown in FIG. 5 described above, the overlapping description will be omitted or simplified, and the following description will focus on the characteristic parts of this example .

ハブ２の、請求項に記載した他端部に対応する、内端部に形成した段部８の中間部内端寄り部分で、この段部８に外嵌した内輪３の内端部内周面に、内端開口に向かう程内径が大きくなる、円錐凹面状の傾斜面１９を形成している。この傾斜面１９が上記ハブ２の中心軸に対し傾斜している傾斜角度θは、２０〜６０度程度とする。又、上記ハブ２の内端面には円形の凹部２０を形成する事により、このハブ２の内端部に円筒部２１を形成している。本実施例の場合にこの円筒部２１は、上記ハブ２の内端部で、ほぼ上記内輪３の肩部２３の内側部分に存在する。 The hub 2 is a portion near the inner end of the intermediate portion of the step portion 8 formed at the inner end portion corresponding to the other end portion described in the claims, and is formed on the inner peripheral surface of the inner end portion of the inner ring 3 that is externally fitted to the step portion 8. An inclined surface 19 having a conical concave shape whose inner diameter increases toward the inner end opening is formed. The inclination angle θ at which the inclined surface 19 is inclined with respect to the central axis of the hub 2 is about 20 to 60 degrees. Further, the inner end face of the hub 2 by forming a circular recess 20, forms a cylindrical portion 21 at the inner end of the hub 2. In the case of the present embodiment, the cylindrical portion 21 is present at the inner end portion of the hub 2 and substantially in the inner portion of the shoulder portion 23 of the inner ring 3.

上述の様な傾斜面１９を形成した内輪３を、上記ハブ２の内端部に設けた円筒部２１をかしめ広げる事によりこのハブ２に固定し、本例の車輪支持用転がり軸受ユニットとする際には、前記図６に示した従来構造の場合に比べて、かしめ部分の変形量が少なくて済む。即ち、上記従来構造の場合にはかしめ部１６を形成する為、ハブ２の内端部に形成した円筒部を直径方向外方に向け、９０度折り曲げるのに対して、本例の車輪支持用転がり軸受ユニットを構成すべく、上記円筒部２１をかしめ広げる際には、この円筒部２１を上記傾斜角度θ（＝２０〜６０度）だけ変形させれば良い。この為、このかしめ部分に発生する歪みを小さく抑えて、このかしめ部に割れ等の損傷が発生するのを抑える事ができる。又、上記変形量を少なく抑える為、このかしめ部を形成する事に基づき、上記円筒部２１の周囲に存在する部材である上記内輪３に、この内輪３の直径方向外方に加わる力を低減できて、この内輪３の損傷防止を図れる。 The inner ring 3 formed an inclined surface 19, such as described above, by widening caulking a cylindrical portion 21 provided on the inner end of the hub 2 is fixed to the hub 2, and wheel support rolling bearing unit of the present embodiment In this case, the amount of deformation of the caulking portion can be reduced as compared with the conventional structure shown in FIG . That is, in the case of the above-described conventional structure, in order to form the caulking portion 16, the cylindrical portion formed at the inner end portion of the hub 2 is bent outward by 90 degrees in the diametrical direction and is bent 90 degrees in this example . When the cylindrical portion 21 is caulked and spread to form a rolling bearing unit, the cylindrical portion 21 may be deformed by the inclination angle θ (= 20 to 60 degrees). For this reason, distortion generated in the caulking portion can be suppressed to be small, and damage such as cracking can be suppressed in the caulking portion. Further, in order to suppress the deformation amount, the force applied to the inner ring 3 that is a member around the cylindrical portion 21 in the outer diameter direction of the inner ring 3 is reduced based on the formation of the caulking portion. Thus, damage to the inner ring 3 can be prevented.

尚、上記円筒部２１を直径方向外方にかしめ広げる作業は、鍛造加工、或は揺動プレス加工により行なう。何れの加工法を採用する場合でも、図２に示す様に、上記円筒部２１の内径側にプレス型２５を押し込み、上記円筒部２１を直径方向外方にかしめ広げる。特に、かしめ作業に揺動プレス加工を採用すれば、成形時の荷重を小さくして、軸受内部への影響をなくし、成形後の予圧管理を適正にできると言った利点がある。又、上記円筒部２１の奥端縁（この円筒部２１の内径が変化しない部分の奥端）と上記内輪３の端面２４との距離Ｌは、車輪支持用転がり軸受ユニットの大きさ等の応じて設計的に定めるが、一般的な乗用車用の車輪支持用転がり軸受ユニットの場合で、５〜１５mm程度とするのが好ましい。   The operation of caulking the cylindrical portion 21 outward in the diametrical direction is performed by forging or swing press. Regardless of which processing method is employed, as shown in FIG. 2, a press die 25 is pushed into the inner diameter side of the cylindrical portion 21, and the cylindrical portion 21 is caulked outward in the diameter direction. In particular, the use of oscillating press working in the caulking work has the advantage that the load during molding can be reduced, the influence on the inside of the bearing can be eliminated, and the preload management after molding can be properly performed. Further, the distance L between the inner edge of the inner ring 3 and the inner edge 3 of the inner edge 3 is determined according to the size of the wheel bearing rolling bearing unit. However, it is preferably about 5 to 15 mm in the case of a general rolling bearing unit for supporting a wheel for passenger cars.

又、上記円筒部２１を構成すべく、上記ハブ２の端部に形成する円形の凹部２０の先端位置は、複列に配置した転動体５、５のうち、内側の列を構成する転動体５の中心よりも内側に位置させている。即ち、図１に点Ｘで示した、上記凹部２０の先端の、上記ハブ２の軸方向に関する位置は、第二の内輪軌道である、上記内輪３の外周面に設けた第二の内輪軌道９に当接する転動体５の中心の、上記ハブ２の軸方向に関する位置よりも、上記ハブ２の内端部側に位置させている。従って、車輪支持用転がり軸受ユニットを構成するハブ２と外輪４との間にラジアル荷重が加わり、上記転動体５から上記第二の内輪軌道９にラジアル荷重が加わった場合でも、上記ハブ２の一部でこのラジアル荷重を受ける部分が充実体である為、このハブ２の耐久性を十分に確保できる。 Further, in order to constitute the cylindrical part 21, the tip position of the circular recess 20 formed at the end of the hub 2 is the rolling element constituting the inner row of the rolling elements 5, 5 arranged in double rows. It is located inside the center of 5. That is, the position of the tip of the recess 20 in the axial direction of the hub 2 indicated by a point X in FIG. 1 is the second inner ring raceway provided on the outer peripheral surface of the inner ring 3. 9 is positioned closer to the inner end of the hub 2 than the position of the center of the rolling element 5 in contact with 9 in the axial direction of the hub 2. Therefore, even when a radial load is applied between the hub 2 and the outer ring 4 constituting the wheel support rolling bearing unit, and a radial load is applied from the rolling element 5 to the second inner ring raceway 9, the hub 2 Since the portion that receives this radial load is a solid body, the durability of the hub 2 can be sufficiently secured.

更に、上記第二の内輪軌道９に当接する転動体５の中心と、上記内輪３の端面２４との、上記ハブ２の軸方向に関する距離Ｍを、上記各転動体５、５の外径Ｄの０．７５倍以上（Ｍ≧０．７５Ｄ）としている。この様に、転動体５の中心と端面２４との距離Ｍを確保している為、上記内輪３の肩部２３や第二の内輪軌道９部分の寸法精度や形状精度が悪化する事を防止して、車輪支持用転がり軸受ユニットの機能を確保できる。即ち、これら各部分の寸法精度や形状精度を良好に確保できるので、車輪支持用転がり軸受ユニットの運転時に振動等が発生するのを防止すると共に、転動体５の転動面や第二の内輪軌道９の転がり疲れ寿命等を確保できる。尚、図示の例では、第一の内輪軌道７をハブ２の中間部外周面に直接形成しているが、この第一の内輪軌道７は、ハブ２と別体の内輪に形成し、この内輪をこのハブ２に外嵌固定しても良い。
［参考例２］ Further, the distance M in the axial direction of the hub 2 between the center of the rolling element 5 contacting the second inner ring raceway 9 and the end surface 24 of the inner ring 3 is defined as the outer diameter D of each rolling element 5, 5. 0.75 times or more (M ≧ 0.75D). As described above, since the distance M between the center of the rolling element 5 and the end face 24 is secured, it is possible to prevent deterioration of the dimensional accuracy and shape accuracy of the shoulder portion 23 of the inner ring 3 and the second inner ring raceway 9 portion. Thus, the function of the wheel bearing rolling bearing unit can be secured. That is, since the dimensional accuracy and shape accuracy of each of these portions can be ensured satisfactorily, vibration and the like are prevented during operation of the wheel support rolling bearing unit, and the rolling surface of the rolling element 5 and the second inner ring are prevented. The rolling fatigue life of the track 9 can be secured. In the illustrated example, the first inner ring raceway 7 is formed directly on the outer peripheral surface of the intermediate portion of the hub 2, but the first inner ring raceway 7 is formed on an inner ring separate from the hub 2. The inner ring may be externally fixed to the hub 2.
[Reference Example 2]

次に、図３は、本発明に関する参考例の第２例を示している。上述した参考例の第１例の場合には、外輪４を回転しない静止輪とし、ハブ２を回転させる構造であったのに対して、本例の場合には、ハブ２を懸架装置に支持して回転させず、外輪４を車輪と共に回転する回転輪としている。回転側と静止側とが逆になった以外の構成及び作用は、前述した参考例の第１例の場合と同様である。 Next, FIG. 3 shows a second example of a reference example related to the present invention . In the first example of the reference example described above, the outer ring 4 is a stationary ring that does not rotate and the hub 2 is rotated. In this example , the hub 2 is supported by a suspension device. Thus, the outer ring 4 is a rotating wheel that rotates together with the wheel without rotating. The configuration and operation other than the rotation side and the stationary side being reversed are the same as in the case of the first example of the reference example described above.

次に、図４は、本発明の実施例を示している。本実施例の場合、ハブ２の内端部で内輪３の嵌合部よりも突出した部分の外径を、この嵌合部の外径よりも小さくしている。即ち、上記ハブ２の内端部に形成した円筒部２１の基端部外周面で、上記内輪３の内端開口部に形成した傾斜面１９よりも少しだけ第二の内輪軌道９に寄った部分に、０．０２〜１mm程度の僅かな段差Ｈを有する段差部２７を形成している。従って、上記円筒部２１の外周面は、この段差部２７を境として、段差面１２側が大径で、上記円筒部２１の先端縁側がこの先端縁に対応する端縁も含めて小径になっている。そして、上記円筒部２１のうちの外径の小さくなった部分を、直径方向外方にかしめ広げ、上記傾斜面１９を抑え付ける様にしている。この様に円筒部２１を直径方向外方にかしめ広げる際には、上記段差部２７がかしめ広げ作業に伴って折れ曲がる部分の起点となる。この為、かしめ広げ作業に伴って上記円筒部２１に無理な力が加わりにくくなって、かしめ広げ部分に亀裂等の損傷が発生しにくくなる。その他の構成及び作用は、前述の図１〜２に示した参考例の第１例の場合と同様である。尚、本実施例の構造を上述の図３に示した参考例の第２例に適用する場合には、軸方向に関する内外方向が逆になる。 Next, FIG. 4 shows an embodiment of the present invention . In the case of this embodiment, the outer diameter of the portion protruding from the fitting portion of the inner ring 3 at the inner end portion of the hub 2 is made smaller than the outer diameter of this fitting portion. That is, at the proximal end portion outer peripheral surface of the cylindrical portion 21 formed on the inner end of the upper kiha Bed 2, the second inner ring raceway 9 slightly than the inclined surface 19 formed on the inner end opening of the inner ring 3 A stepped portion 27 having a slight stepped portion H of about 0.02 to 1 mm is formed at the offset portion. Therefore, the outer peripheral surface of the cylindrical portion 21 has a large diameter on the stepped surface 12 side with the stepped portion 27 as a boundary, and the tip end side of the cylindrical portion 21 has a small diameter including an end edge corresponding to the tip end edge. Yes. And the part where the outer diameter became small among the said cylindrical parts 21 is caulked and spread outward in the diameter direction, and the said inclined surface 19 is suppressed. In this way, when the cylindrical portion 21 is caulked and spread outward in the diameter direction, the stepped portion 27 becomes a starting point of a portion that is bent along with caulking and spreading work. For this reason, it becomes difficult to apply an excessive force to the cylindrical portion 21 with the caulking and spreading work, and damage such as cracks is less likely to occur in the caulking and spreading portion. Other configurations and operations are the same as those in the first example of the reference example shown in FIGS. In addition, when the structure of the present embodiment is applied to the second example of the reference example shown in FIG. 3, the inner and outer directions with respect to the axial direction are reversed.

本発明に関する参考例の第１例を示す半部断面図。Sectional drawing which shows the 1st example of the reference example regarding this invention. ハブの内端部に形成した円筒部をかしめ広げる状態を示す、要部拡大断面図。 The principal part expanded sectional view which shows the state which crimps and spreads the cylindrical part formed in the inner end part of a hub . 本発明に関する参考例の第２例を示す半部断面図。Sectional drawing of the half part which shows the 2nd example of the reference example regarding this invention. 本発明の実施例を示す要部拡大断面図。 The principal part expanded sectional view which shows the Example of this invention . 従来構造の第１例を示す半部断面図。The half part sectional view showing the 1st example of conventional structure. 同第２例を示す半部断面図。Sectional sectional drawing which shows the 2nd example.

符号の説明Explanation of symbols

１ 車輪支持用転がり軸受ユニット
２ ハブ
３、３ａ 内輪
４ 外輪
５ 転動体
６ 第一のフランジ
７ 第一の内輪軌道
８ 段部
９ 第二の内輪軌道
１０ 雄ねじ部
１１ ナット
１２ 段差面
１３ 第一の外輪軌道
１４ 第二の外輪軌道
１５ 第二のフランジ
１６ かしめ部
１７ 係止凹部
１８ スぺーサリング
１９ 傾斜面
２０ 凹部
２１ 円筒部
２２ シールリング
２３ 肩部
２４、２４ａ 端面
２５ プレス型
２６ 内輪円筒部
２７ 段差部
２８ 凹溝
２９ 蓋体
DESCRIPTION OF SYMBOLS 1 Rolling bearing unit for wheel support 2 Hub 3, 3a Inner ring 4 Outer ring 5 Rolling body 6 First flange 7 First inner ring raceway 8 Step part 9 Second inner ring raceway 10 Male thread part 11 Nut 12 Step surface 13 First step Outer ring raceway 14 Second outer ring raceway 15 Second flange 16 Caulking portion 17 Locking recess 18 Spacer ring 19 Inclined surface 20 Recess 21 Cylindrical portion 22 Seal ring 23 Shoulder portion 24, 24a End surface 25 Press die 26 Inner ring cylindrical portion 27 Step part 28 Groove 29 Lid

Claims (1)

一端部外周面に第一のフランジを、中間部外周面に直接又は別体の内輪を介して第一の内輪軌道を、それぞれ設けたハブと、このハブの他端部に形成された、上記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段部と、外周面に第二の内輪軌道を形成して上記段部に外嵌した内輪と、外周面に第二のフランジを、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、それぞれ形成した外輪と、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た転動体とを備え、上記ハブの他端部で少なくとも上記段部に外嵌した内輪よりも突出した部分に形成した円筒部を直径方向外方にかしめ広げる事で形成したかしめ部により、上記段部に外嵌した内輪をこの段部の段差面に向け抑え付けて、この段部に外嵌した内輪を上記ハブに結合固定した車輪支持用転がり軸受ユニットに於いて、上記円筒部の外周面は、上記段差面側が大径で、この円筒部の先端縁側がこの先端縁に対応する端縁も含めて小径になっている事を特徴とする車輪支持用転がり軸受ユニット。 The first flange is formed on the outer peripheral surface of the one end and the first inner ring raceway is formed on the outer peripheral surface of the intermediate portion directly or via a separate inner ring. A step portion having an outer diameter smaller than a portion where the first inner ring raceway is formed, an inner ring formed on the outer peripheral surface to form a second inner ring raceway and externally fitted to the step portion, and a second portion on the outer peripheral surface . a flange, a second outer raceway opposed to the first outer raceway and said second inner ring raceway opposed to the inner said peripheral surface a first inner ring raceway, an outer ring formed respectively, the first, second A plurality of rolling elements each provided between the inner ring raceway and the first and second outer ring raceways, and projecting from the inner ring that is externally fitted to at least the stepped portion at the other end of the hub . the caulked portion formed by Ru spread caulking a cylindrical portion formed at a portion diametrically outward, the step portion The fitted the inner ring put suppressed towards the stepped surface of the stepped portion, the outer fitting the inner ring on the step portion at the wheel supporting rolling bearing unit which is connected and fixed to said hub, an outer peripheral surface of the cylindrical portion, A wheel bearing rolling bearing unit characterized in that the stepped surface side has a large diameter and the tip end side of the cylindrical portion has a small diameter including an end edge corresponding to the tip end edge .
JP2005177772A 2005-06-17 2005-06-17 Rolling bearing unit for wheel support Expired - Fee Related JP4186959B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005177772A JP4186959B2 (en) 2005-06-17 2005-06-17 Rolling bearing unit for wheel support

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Application Number Priority Date Filing Date Title
JP2005177772A JP4186959B2 (en) 2005-06-17 2005-06-17 Rolling bearing unit for wheel support

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP25304896A Division JP3855315B2 (en) 1996-09-25 1996-09-25 Manufacturing method of wheel bearing rolling bearing unit

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JP2005291501A JP2005291501A (en) 2005-10-20
JP4186959B2 true JP4186959B2 (en) 2008-11-26

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