JP3736571B2 - Rolling bearing unit for driving wheel and method for manufacturing driving unit for wheel - Google Patents

Rolling bearing unit for driving wheel and method for manufacturing driving unit for wheel Download PDF

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JP3736571B2
JP3736571B2 JP2005108648A JP2005108648A JP3736571B2 JP 3736571 B2 JP3736571 B2 JP 3736571B2 JP 2005108648 A JP2005108648 A JP 2005108648A JP 2005108648 A JP2005108648 A JP 2005108648A JP 3736571 B2 JP3736571 B2 JP 3736571B2
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wheel
hub
peripheral surface
inner ring
rolling bearing
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JP2005255165A (en
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英男 大内
英志 渋谷
信行 萩原
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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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/063—Fixing them on the shaft
    • 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
    • F16C19/185—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 two raceways provided integrally on a part other than a race ring, e.g. a shaft or housing
    • 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

この発明は、独立懸架式サスペンションに支持された駆動輪｛ＦＦ車（前置エンジン前輪駆動車）の前輪、ＦＲ車（前置エンジン後輪駆動車）及びＲＲ車（後置エンジン後輪駆動車）の後輪、４ＷＤ車（四輪駆動車）の全輪｝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用転がり軸受ユニット及び車輪用駆動ユニットの製造方法に関する。 The present invention relates to a drive wheel {an FF vehicle (front engine front wheel drive vehicle) front wheel, an FR vehicle (front engine rear wheel drive vehicle) and an RR vehicle (rear engine rear wheel drive vehicle) supported by an independent suspension type suspension. ) Rear wheels, all wheels of a 4WD vehicle (four-wheel drive vehicle)} are rotatably supported with respect to the suspension device, and are used for driving wheel rolling bearing units and wheels used for rotationally driving the drive wheels. The present invention relates to a method for manufacturing a drive unit.

車輪を懸架装置に対して回転自在に支持する為に、外輪と内輪とを転動体を介して回転自在に組み合わせた駆動輪用転がり軸受ユニットが、各種使用されている。又、独立懸架式サスペンションに駆動輪を支持すると共に、この駆動輪を回転駆動する為の駆動輪用転がり軸受ユニットは、車輪側等速ジョイントと結合自在な構造である必要がある。この車輪側等速ジョイントは、駆動輪の変位やこの駆動輪に付与された舵角に拘らず、駆動力を伝達する為の伝達軸の回転を上記駆動輪に対して円滑に（等速性を確保して）伝達する為に必要である。図１は、この様な目的で駆動輪用転がり軸受ユニット１と車輪側等速ジョイント２とを組み合わせた、従来から一般的に実施されている構造を示している。 In order to rotatably support the wheel with respect to the suspension device, various types of driving wheel rolling bearing units in which an outer ring and an inner ring are rotatably combined via a rolling element are used. Further, the drive wheel rolling bearing unit for supporting the drive wheel on the independent suspension type suspension and driving the drive wheel to rotate is required to have a structure that can be coupled to the constant velocity joint on the wheel side. This wheel side constant velocity joint smoothly rotates the transmission shaft for transmitting the driving force with respect to the driving wheel regardless of the displacement of the driving wheel and the rudder angle given to the driving wheel (constant velocity property). Necessary to communicate). FIG. 1 shows a structure that has been generally implemented conventionally, in which a driving wheel rolling bearing unit 1 and a wheel side constant velocity joint 2 are combined for this purpose.

このうちの駆動輪用転がり軸受ユニット１は、外輪３の内径側にハブ４及び内輪５を、複数個の転動体６、６を介して回転自在に支持して成る。このうちの外輪３は、その外周面に設けた第一のフランジ７により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３の内周面には１対の外輪軌道８、８を設けて、この外輪３の内径側に上記ハブ４及び内輪５を、この外輪３と同心に、回転自在に支持している。   Of these, the driving wheel rolling bearing unit 1 includes a hub 4 and an inner ring 5 rotatably supported on the inner diameter side of the outer ring 3 via a plurality of rolling elements 6 and 6. Out of these, the outer ring 3 is coupled and fixed to a knuckle (not shown) constituting the suspension device by a first flange 7 provided on the outer peripheral surface thereof, and does not rotate during use. Further, a pair of outer ring raceways 8 and 8 are provided on the inner peripheral surface of the outer ring 3, and the hub 4 and the inner ring 5 are rotatably supported concentrically with the outer ring 3 on the inner diameter side of the outer ring 3. ing.

このうちのハブ４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となる側で、各図の左側。本明細書及び特許請求の範囲全体で同じ。）寄り部分に、車輪を支持する為の第二のフランジ９を設けている。又、上記ハブ４の外周面の中間部に第一の内輪軌道１０を形成し、同じく内端（軸方向に関して内とは、自動車への組み付け状態で車両の幅方向中央側となる側で、各図の右側。本明細書及び特許請求の範囲全体で同じ。）部に形成した、請求項１、２に記載した嵌合円筒面部に相当する小径段部１１に、その外周面に第二の内輪軌道１２を形成した上記内輪５を外嵌固定している。又、上記ハブ４の中心部には、雌スプライン孔１３を設けている。 Of these, the hub 4 is the outer end of the outer peripheral surface (the outside in the axial direction is the side that is the outer side in the width direction of the vehicle when assembled to the automobile, and the left side of each figure . The entire specification and claims) The same is applied to the second flange 9 for supporting the wheel. Further, the first inner ring raceway 10 is formed in the intermediate portion of the outer peripheral surface of the hub 4 and is also the inner end (inside with respect to the axial direction, the inner side is the central side in the width direction of the vehicle in the assembled state in the automobile, The right side of each figure . This is the same in the entire specification and claims.) The small diameter step portion 11 corresponding to the fitting cylindrical surface portion described in claim 1 and 2 is formed on the outer peripheral surface. The inner ring 5 on which the inner ring raceway 12 is formed is fitted and fixed. A female spline hole 13 is provided at the center of the hub 4.

一方、前記車輪側等速ジョイント２は、等速ジョイント用外輪１４と、等速ジョイント用内輪１５と、複数のボール１６、１６と、スプライン軸１７とを備える。上記等速ジョイント用外輪１４はこのスプライン軸１７の内端部に、このスプライン軸１７と同心に設けられている。この様な等速ジョイント用外輪１４の内周面の円周方向複数個所には外径側係合溝１８、１８を、それぞれこの円周方向に対し直角方向に形成している。又、上記等速ジョイント用内輪１５は、中心部に第二のスプライン孔１９を、その外周面で上記各外径側係合溝１８、１８と整合する部分に内径側係合溝２０、２０を、それぞれ円周方向に対し直角方向に形成している。そして、これら各内径側係合溝２０、２０と上記各外径側係合溝１８、１８との間に上記各ボール１６、１６を、保持器２１により保持した状態で、これら各係合溝２０、１８に沿う転動自在に設けている。尚、上記車輪側等速ジョイント２の構成各部の形状等に就いては、周知のツェッパ型或はバーフィールド型の等速ジョイントの場合と同様であり、本発明の要旨とは関係しないので、詳しい説明は省略する。   On the other hand, the wheel side constant velocity joint 2 includes a constant velocity joint outer ring 14, a constant velocity joint inner ring 15, a plurality of balls 16 and 16, and a spline shaft 17. The outer ring 14 for the constant velocity joint is provided at the inner end of the spline shaft 17 concentrically with the spline shaft 17. Outer diameter side engaging grooves 18 and 18 are formed at a plurality of positions on the inner peripheral surface of the constant velocity joint outer ring 14 in the direction perpendicular to the circumferential direction. The inner ring 15 for the constant velocity joint has a second spline hole 19 at the center, and inner diameter side engaging grooves 20, 20 at the outer peripheral surface aligned with the outer diameter side engaging grooves 18, 18. Are formed at right angles to the circumferential direction. Then, in a state where the balls 16, 16 are held by the cage 21 between the inner diameter side engagement grooves 20, 20 and the outer diameter side engagement grooves 18, 18, the engagement grooves 20 and 18 are provided so as to be freely rollable. The shape of each component of the wheel side constant velocity joint 2 is the same as that of a well-known Zepper type or Barfield type constant velocity joint, and is not related to the gist of the present invention. Detailed description is omitted.

上述の様な車輪側等速ジョイント２と前述の様な駆動輪用転がり軸受ユニット１とは、上記スプライン軸１７を上記ハブ４の雌スプライン孔１３に、内側から外側に向け挿通する。そして、上記スプライン軸１７の外端部で上記ハブ４の外端面から突出した部分に設けた雄ねじ部２２にナット２３を螺合し、更に緊締する事により、互いに結合固定する。この状態で、前記内輪５の内端面は上記等速ジョイント用外輪１４の外端面に当接するので、この内輪５が前記小径段部１１から抜け出る方向に変位する事はない。同時に、前記各転動体６、６に適正な予圧が付与される。 The wheel side constant velocity joint 2 as described above and the drive wheel rolling bearing unit 1 as described above insert the spline shaft 17 through the female spline hole 13 of the hub 4 from the inside to the outside. Then, a nut 23 is screwed into a male screw portion 22 provided at a portion protruding from the outer end surface of the hub 4 at the outer end portion of the spline shaft 17, and further tightened to be coupled and fixed to each other. In this state, the inner end surface of the inner ring 5 is in contact with the outer end surface of the constant velocity joint outer ring 14, so that the inner ring 5 is not displaced in the direction of coming out of the small diameter step portion 11. At the same time, an appropriate preload is applied to each of the rolling elements 6 and 6.

更に、自動車の懸架装置への組み付け状態では、前記等速ジョイント用内輪１５の中心部に設けた第二の雌スプライン孔１９に、伝達軸２４の外端部に設けた雄スプライン部２５をスプライン係合させて、この伝達軸２４を上記等速ジョイント用内輪１５に、回転力の伝達自在に結合する。又、この伝達軸２４の内端部は、デファレンシャルギヤの出力軸部に設けた、トリポード型のデファレンシャル側等速ジョイント２６の出力部であるトラニオン２７（後述する図４参照）の中心部に結合固定する。従って、自動車の走行時に上記伝達軸２４は、等速回転する。 Further, in the state of being assembled to the suspension device of the automobile, the male spline portion 25 provided at the outer end portion of the transmission shaft 24 is splined into the second female spline hole 19 provided at the center portion of the inner ring 15 for the constant velocity joint. The transmission shaft 24 is engaged with the constant velocity joint inner ring 15 so as to be able to transmit a rotational force. Further, the inner end portion of the transmission shaft 24 is coupled to the central portion of a trunnion 27 (see FIG . 4 described later) which is an output portion of a tripod type differential side constant velocity joint 26 provided on the output shaft portion of the differential gear . Fix it. Therefore, the transmission shaft 24 rotates at a constant speed when the automobile is running.

又、特許文献１には、図２に示す様に、ハブ４ａの内端部で小径段部１１に外嵌した内輪５よりも内方に突出した部分に存在する円筒部を直径方向外方にかしめ広げて形成したかしめ部２８により、上記内輪５を上記小径段部１１の段差面２９に向け抑え付ける構造が記載されている。この従来構造の第２例の場合には、上記かしめ部２８による抑え付け力により、各転動体６、６に予圧を付与する。尚、上記特許文献１に記載された構造の場合には、駆動輪用転がり軸受ユニット１ａと車輪側等速ジョイント２との結合は、上述した従来構造の第１例の場合と同様に、スプライン軸１７の外端部に設けた雄ねじ部２２とナット２３との螺合・緊締により行なっている。特許文献２にも、同様の構造が記載されている。 Further, in Patent Document 1, as shown in FIG. 2 , a cylindrical portion that exists in a portion protruding inward from the inner ring 5 that is externally fitted to the small-diameter step portion 11 at the inner end portion of the hub 4a is diametrically outward. A structure is described in which the inner ring 5 is pressed against the step surface 29 of the small-diameter step portion 11 by a caulking portion 28 formed by caulking and spreading. In the case of the second example of the conventional structure, a preload is applied to the rolling elements 6 and 6 by the pressing force by the caulking portion 28. In the case of the structure described in Patent Document 1, the coupling between the driving wheel rolling bearing unit 1a and the wheel side constant velocity joint 2 is a spline as in the case of the first example of the conventional structure described above. This is done by screwing / tightening a male threaded portion 22 and a nut 23 provided at the outer end of the shaft 17. Patent Document 2 also describes a similar structure.

但し、上記図２に示す様に、上記内輪５を上記ハブ４ａに対し固定する為にかしめ部２８を使用する構造の場合には、このかしめ部２８の形成により、上記各転動体６、６への予圧付与は完了する。従って、上記雄ねじ部２２とナット２３とを省略し、駆動輪用転がり軸受ユニットと車輪側等速ジョイントとを結合して成る車輪駆動用転がり軸受ユニットの小型・軽量化を図る事も可能である。図３は、この様な観点で構成した車輪駆動用転がり軸受ユニット３０の１例を示している。 However, as shown in FIG. 2 , in the case where the caulking portion 28 is used to fix the inner ring 5 to the hub 4a, the rolling elements 6, 6 are formed by forming the caulking portion 28. Preloading to is completed. Therefore, it is possible to reduce the size and weight of the wheel drive rolling bearing unit formed by combining the drive wheel rolling bearing unit and the wheel side constant velocity joint by omitting the male screw portion 22 and the nut 23. . FIG. 3 shows an example of a wheel drive rolling bearing unit 30 configured from such a viewpoint.

この車輪駆動用転がり軸受ユニット３０は、ハブ４ｂの中心部に形成した雌スプライン孔１３内に挿入したスプライン軸１７の抜け止めを、弾性材製の止め輪３１により図っている。この為に、上記雌スプライン孔１３の外端部に係止段部３２等の外径側係止部を、上記スプライン軸１７の外端部外周面に係止溝３３等の内径側係止部を、それぞれ設けている。そして、ばね鋼製の線材を欠円環状に形成する事により直径を弾性的に拡縮自在とした、上記止め輪３１を、上記係止段部３２と上記係止溝３３との間に掛け渡している。この様に、止め輪３１により上記雌スプライン孔１３からの上記スプライン軸１７の抜け止めを図り、駆動輪用転がり軸受ユニット１ｂと車輪側等速ジョイント２とを結合する事により、雄ねじ部とナットとを省略する構造によれば、車輪駆動用転がり軸受ユニット３０の小型・軽量化を図れる。 In this wheel drive rolling bearing unit 30, the spline shaft 17 inserted into the female spline hole 13 formed at the center of the hub 4b is prevented from coming off by a retaining ring 31 made of an elastic material. For this purpose, an outer diameter side locking portion such as a locking step 32 is provided at the outer end portion of the female spline hole 13, and an inner diameter side locking such as a locking groove 33 is provided on the outer peripheral surface of the outer end portion of the spline shaft 17. Each part is provided. Then, the retaining ring 31 whose diameter is made elastically expandable / contractable by forming a spring steel wire rod in an annular shape is spanned between the locking step portion 32 and the locking groove 33. ing. In this manner, the retaining ring 31 prevents the spline shaft 17 from coming off from the female spline hole 13, and the driving wheel rolling bearing unit 1b and the wheel side constant velocity joint 2 are coupled to each other so that the male thread portion and the nut are connected. According to the structure in which are omitted, the wheel drive rolling bearing unit 30 can be reduced in size and weight.

上述の様な車輪駆動用転がり軸受ユニット３０は、図４に示す様に伝達軸２４及びデファレンシャル側等速ジョイント２６と組み合わせて、車輪用駆動ユニット３４を構成する。このうちのデファレンシャル側等速ジョイント２６は、自動車への組み付け状態では、図示しないデファレンシャルギヤの出力部に結合する。又、上記伝達軸２４は、上記デファレンシャル側等速ジョイント２６の出力部であるトラニオン２７の基端部に内端部を、車輪側等速ジョイント２の入力部である等速ジョイント用内輪１５に外端部を、それぞれ結合している。この様な車輪用駆動ユニット３４により、上記デファレンシャルギヤの出力部からハブ４ｂに支持した駆動輪に回転力を伝達し、この駆動輪を回転駆動する。 The wheel drive rolling bearing unit 30 as described above constitutes a wheel drive unit 34 in combination with the transmission shaft 24 and the differential side constant velocity joint 26 as shown in FIG . Among these, the differential side constant velocity joint 26 is coupled to an output portion of a differential gear (not shown) in a state of being assembled to an automobile. The transmission shaft 24 is connected to the inner end portion of the trunnion 27 which is an output portion of the differential side constant velocity joint 26 and to the inner ring 15 for the constant velocity joint which is an input portion of the wheel side constant velocity joint 2. The outer ends are joined to each other. By such a wheel drive unit 34, a rotational force is transmitted from the output portion of the differential gear to the drive wheel supported by the hub 4b, and the drive wheel is rotationally driven.

上述した図２〜４に示す様な、かしめ部２８によりハブ４ａ、４ｂに対し内輪５を固定する構造の場合には、図１に示す構造から雄ねじ部２２及びナット２３を省略する事により、コスト低減を図れるだけでなく、車輪駆動用転がり軸受ユニット３０、延いては車輪駆動ユニット３４の小型・軽量化を図れる。このうちの車輪駆動用転がり軸受ユニット３０は、懸架装置に組み込んだばねよりも車輪側に存在する、所謂ばね下荷重になる為、少しの軽量化も乗り心地や走行安定性を中心とする走行性能の向上に寄与する。 In the case of the structure in which the inner ring 5 is fixed to the hubs 4a and 4b by the caulking portion 28 as shown in FIGS. 2 to 4, the male screw portion 22 and the nut 23 are omitted from the structure shown in FIG. Not only can the cost be reduced, but also the wheel drive rolling bearing unit 30 and thus the wheel drive unit 34 can be reduced in size and weight. Of these, the rolling bearing unit 30 for driving the wheel is a so-called unsprung load that exists on the wheel side of the spring incorporated in the suspension device, so that a slight weight reduction can be achieved with a focus on ride comfort and running stability. Contributes to improved performance.

長期間に亙って使用する駆動輪用転がり軸受ユニット１ａ、１ｂを構成するハブ４ａ、４ｂに対し内輪５を固定する為のかしめ部２８の強度は十分に確保する必要がある。従って、このかしめ部２８を形成する為に要する荷重は、揺動かしめ等の、加工時に加わる荷重を比較的低く抑えられる方法を採用したとしても、相当に大きくなる。そして、この様な荷重は上記ハブ４ａ、４ｂの内端部に、軸方向外方に向いたスラスト荷重として加わる。この為、何らの対策も施さない場合には、上記ハブ４ａ、４ｂの中心部に形成した雌スプライン孔１３の一部（特に内端寄り部分）が、僅かとは言え径方向内方に変形する事が、本発明者等が行なった実験の結果分かった。 It is necessary to secure sufficient strength of the caulking portion 28 for fixing the inner ring 5 to the hubs 4a and 4b constituting the driving wheel rolling bearing units 1a and 1b used for a long period of time. Therefore, the load required to form the caulking portion 28 is considerably large even if a method that can keep the load applied during processing, such as swing caulking, relatively low. Such a load is applied as a thrust load directed outward in the axial direction to the inner ends of the hubs 4a and 4b. Therefore, when no countermeasure is taken, a part of the female spline hole 13 formed in the central part of the hubs 4a and 4b (particularly the part near the inner end) is deformed inward in the radial direction although it is slight. This has been found as a result of experiments conducted by the present inventors.

即ち、従来は、上記ハブ４ａ、４ｂの内端部に設けた円筒部３７を上記かしめ部２８に加工する場合、この円筒部３７を径方向外方にかしめ広げるので、このかしめ部２８の近傍に位置する、上記雌スプライン孔１３の内端は径方向外方に変形するものと考えられていた。ところが、上述の様に、上記かしめ部２８の加工時に加わるスラスト荷重が大きく、このスラスト荷重に対する横歪みの影響が従来考えられていた以上に大きくなる為、上記かしめ部２８の近傍である上記雌スプライン孔１３の内端部が、逆に径方向内方に変形する事を、本発明者等が発見した。何れにしても、上記雌スプライン孔１３がその一部でも径方向内方に変形した場合には、上記雌スプライン孔１３内にスプライン軸１７を挿入しにくくなり、車輪駆動用転がり軸受ユニット３０の組立作業を行ないにくくなってしまう。 That is, conventionally, when the cylindrical portion 37 provided at the inner end of the hub 4a, 4b is processed into the caulking portion 28, the cylindrical portion 37 is caulked outward in the radial direction. It was considered that the inner end of the female spline hole 13 located at the position is deformed radially outward. However, as described above, the thrust load applied during the processing of the caulking portion 28 is large, and the influence of lateral strain on the thrust load is larger than previously thought. Therefore, the female in the vicinity of the caulking portion 28 is used. The inventors have found that the inner end of the spline hole 13 is deformed radially inward. In any case, when even a part of the female spline hole 13 is deformed radially inward, it becomes difficult to insert the spline shaft 17 into the female spline hole 13, and the rolling bearing unit 30 for driving the wheel is not provided. It becomes difficult to perform assembly work.

特開平１１−５４０４号公報Japanese Patent Laid-Open No. 11-5404 特開２０００−８７９７９号公報JP 2000-87979 A

本発明の駆動輪用転がり軸受ユニット及び車輪用駆動ユニットの製造方法は、この様な事情に鑑みて発明したものである。 The manufacturing method of the rolling bearing unit for driving wheels and the driving unit for wheels of the present invention has been invented in view of such circumstances.

本発明の駆動輪用転がり軸受ユニット及び車輪用駆動ユニットの製造方法のうち、請求項１に記載した駆動輪用転がり軸受ユニットの製造方法により製造する駆動輪用転がり軸受ユニットは、前述した従来から知られている駆動輪用転がり軸受ユニットと同様に、
外輪と、ハブと、内輪と、複数の転動体とを備える。
このうちの外輪は、外周面に懸架装置に結合固定する為の第一のフランジを、内周面に複列の外輪軌道を、それぞれ有する。
又、上記ハブは、中心部に雌スプライン孔を、外周面の外端寄り部分に駆動輪を支持固定する為の第二のフランジを、外周面の中間部に直接又は別体の内輪を介して第一の内輪軌道を、外周面の内端寄り部分に嵌合円筒面部を、それぞれ有する。
又、上記内輪は、外周面に第二の内輪軌道を有し、上記嵌合円筒面部に外嵌した状態で、上記ハブの内端部に形成された円筒部を径方向外方に塑性変形させて形成されたかしめ部で内端面を抑え付けられて、上記ハブに固定されたものである。
又、上記各転動体は、上記複列の外輪軌道と上記第一、第二の内輪軌道との間に、それぞれ複数個ずつ転動自在に設けられているものである。
そして、請求項１に記載した駆動輪用転がり軸受ユニットの製造方法は、上記ハブの中心部に雌スプライン孔を形成する一次加工を施した後、上記かしめ部を形成する加工を行ない、その後、上記ハブの雌スプライン孔の、このかしめ部の形成によって縮径したものを再加工する二次加工を行なう。 Among the manufacturing methods of the driving wheel rolling bearing unit and the wheel driving unit of the present invention, the driving wheel rolling bearing unit manufactured by the manufacturing method of the driving wheel rolling bearing unit according to claim 1 is the conventional one described above. Similar to the known drive wheel rolling bearing unit,
An outer ring, a hub, an inner ring, and a plurality of rolling elements are provided.
Of these, the outer ring has a first flange for coupling and fixing to the suspension device on the outer peripheral surface, and a double row outer ring raceway on the inner peripheral surface.
The hub has a female spline hole in the center, a second flange for supporting and fixing the drive wheel near the outer end of the outer peripheral surface, and a direct or separate inner ring in the middle of the outer peripheral surface. The first inner ring raceway has a fitting cylindrical surface portion on the inner end portion of the outer peripheral surface.
The inner ring has a second inner ring raceway on the outer peripheral surface, and the cylindrical portion formed on the inner end portion of the hub is plastically deformed radially outward in a state of being externally fitted to the fitting cylindrical surface portion. The inner end face is held down by the caulking portion formed and fixed to the hub.
Each of the rolling elements is provided so as to be capable of rolling plurally between the double row outer ring raceway and the first and second inner ring raceways.
And the manufacturing method of the rolling bearing unit for drive wheels described in Claim 1 performs the process which forms the said crimping part, after giving the primary process which forms a female spline hole in the central part of the above-mentioned hub, Secondary processing is performed to rework the female spline hole of the hub whose diameter has been reduced by the formation of the caulking portion .

又、請求項２に記載した車輪用駆動ユニットの製造方法により製造する車輪用駆動ユニットは、前述した従来から知られている車輪用駆動ユニットと同様に、デファレンシャルギヤの出力部に結合されるデファレンシャル側等速ジョイントと、このデファレンシャル側等速ジョイントの出力部に内端部を結合された伝達軸と、この伝達軸の外端部に入力部を結合された車輪側等速ジョイントと、この車輪側等速ジョイントの出力部に結合された駆動輪用転がり軸受ユニットとから成る。
又、この駆動輪用転がり軸受ユニットは、外輪と、ハブと、内輪と、複数の転動体とを備える。
このうちの外輪は、外周面に懸架装置に結合固定する為の第一のフランジを、内周面に複列の外輪軌道を、それぞれ有する。
又、上記ハブは、中心部に雌スプライン孔を、外周面の外端寄り部分に駆動輪を支持固定する為の第二のフランジを、外周面の中間部に直接又は別体の内輪を介して第一の内輪軌道を、外周面の内端寄り部分に嵌合円筒面部を、それぞれ有する。
又、上記内輪は、外周面に第二の内輪軌道を有し、上記嵌合円筒面部に外嵌した状態で、上記ハブの内端部に形成された円筒部を径方向外方に塑性変形させて形成されたかしめ部で内端面を抑え付けられて、上記ハブに固定されたものである。
又、上記各転動体は、上記複列の外輪軌道と上記第一、第二の内輪軌道との間に、それぞれ複数個ずつ転動自在に設けられているものである。
又、上記駆動輪用転がり軸受ユニットを構成するハブに設けた雌スプライン孔と、上記車輪側等速ジョイントの出力部に設けたスプライン軸とをスプライン係合させている。
そして、上記駆動輪用転がり軸受ユニットを請求項１に記載した駆動輪用転がり軸受ユニットの製造方法により製造する。
尚、上述の請求項１、２の構成中、「ハブの内端部に形成された円筒部」は内外両周面を単なる円筒面としたものに限定するものではなく、略円筒状であれば良い。 Also, the wheel drive unit to be manufactured by the manufacturing method of a wheel drive unit according to claim 2, like the wheel drive unit known from the prior art described above, differential coupled to the output of the differential gear Side constant velocity joint, a transmission shaft having an inner end coupled to the output portion of the differential side constant velocity joint, a wheel side constant velocity joint having an input portion coupled to the outer end of the transmission shaft, and the wheel It comprises a drive wheel rolling bearing unit coupled to the output portion of the side constant velocity joint.
The driving wheel rolling bearing unit includes an outer ring, a hub, an inner ring, and a plurality of rolling elements.
Of these, the outer ring has a first flange for coupling and fixing to the suspension device on the outer peripheral surface, and a double row outer ring raceway on the inner peripheral surface.
The hub has a female spline hole in the center, a second flange for supporting and fixing the drive wheel near the outer end of the outer peripheral surface, and a direct or separate inner ring in the middle of the outer peripheral surface. The first inner ring raceway has a fitting cylindrical surface portion on the inner end portion of the outer peripheral surface.
The inner ring has a second inner ring raceway on the outer peripheral surface, and the cylindrical portion formed on the inner end portion of the hub is plastically deformed radially outward in a state of being externally fitted to the fitting cylindrical surface portion. The inner end face is held down by the caulking portion formed and fixed to the hub.
Each of the rolling elements is provided so as to be capable of rolling plurally between the double row outer ring raceway and the first and second inner ring raceways.
Further, a female spline hole provided in a hub constituting the driving wheel rolling bearing unit and a spline shaft provided at an output portion of the wheel side constant velocity joint are spline engaged.
And the said driving wheel rolling bearing unit is manufactured with the manufacturing method of the driving wheel rolling bearing unit described in Claim 1.
In addition, in the configuration of the above-described claims 1 and 2, the “cylindrical portion formed at the inner end portion of the hub” is not limited to the case where both the inner and outer peripheral surfaces are simply cylindrical surfaces, and may be substantially cylindrical. It ’s fine.

上述の様に構成する本発明の駆動輪用転がり軸受ユニット及び車輪用駆動ユニットの製造方法によれば、かしめ部の加工に伴う雌スプライン孔の変形に拘らず、この雌スプライン孔内へのスプライン軸の挿入作業を容易に行なえる様にできる。 According to the method of manufacturing the driving wheel rolling bearing unit and the wheel driving unit of the present invention configured as described above, the spline into the female spline hole regardless of the deformation of the female spline hole due to the processing of the caulking portion. The shaft can be inserted easily.

本発明の実施例の駆動輪用転がり軸受ユニット及び車輪用駆動ユニットの製造方法の特徴は、駆動輪用転がり軸受ユニットを製造する際に、ハブの中心部に雌スプライン孔を形成する一次加工を施した後、上記かしめ部を形成する加工を行ない、その後、上記ハブの雌スプライン孔の、このかしめ部の形成によって縮径したものを再加工する二次加工を行なう点にある。
本実施例の製造方法により得られる駆動輪用転がり軸受ユニット及び車輪用駆動ユニットのその他の構造は、前述の図２に示した従来構造の第２例、或は図３〜４に示した、この第２例の構造を改良したものと同様である。
The feature of the method for manufacturing the driving wheel rolling bearing unit and the wheel driving unit according to the embodiment of the present invention is that when the driving wheel rolling bearing unit is manufactured, primary processing for forming a female spline hole at the center of the hub is performed. After the application, a process for forming the caulking part is performed, and then a secondary process for reworking the female spline hole of the hub whose diameter is reduced by the formation of the caulking part is performed.
Other structures of the drive wheel rolling bearing unit and the wheel drive unit obtained by the manufacturing method of the present embodiment are the second example of the conventional structure shown in FIG. 2 described above, or shown in FIGS. This is the same as the improved structure of the second example.

上述の様に構成する本発明の駆動輪用転がり軸受ユニット及び車輪用駆動ユニットの製造方法によれば、かしめ部の加工に伴う雌スプライン孔の変形に拘らず、この雌スプライン孔内へのスプライン軸の挿入作業を容易に行なえる様にできる。According to the method for manufacturing the driving wheel rolling bearing unit and the wheel driving unit of the present invention configured as described above, the spline into the female spline hole regardless of the deformation of the female spline hole due to the processing of the caulking portion. The shaft can be inserted easily.

従来構造の第１例の駆動輪用転がり軸受ユニットを示す断面図。Sectional drawing which shows the rolling bearing unit for drive wheels of the 1st example of a conventional structure. 本発明の製造方法により製造する対象となる、従来構造の第２例の駆動輪用転がり軸受ユニットを示す半部断面図。The half part sectional view which shows the rolling bearing unit for drive wheels of the 2nd example of the conventional structure used as the object manufactured with the manufacturing method of this invention. 同じくこの第２例を改良した構造を示す断面図。Sectional drawing which shows the structure which improved this 2nd example similarly. 同じくこの改良した構造を組み込んだ車輪用駆動ユニットの断面図。Sectional drawing of the drive unit for wheels which similarly incorporated this improved structure.

符号の説明Explanation of symbols

１、１ａ、１ｂ 駆動輪用転がり軸受ユニット
２ 車輪側等速ジョイント
３ 外輪
４、４ａ、４ｂ ハブ
５ 内輪
６ 転動体
７ 第一のフランジ
８ 外輪軌道
９ 第二のフランジ
１０ 第一の内輪軌道
１１ 小径段部
１２ 第二の内輪軌道
１３ 雌スプライン孔
１４ 等速ジョイント用外輪
１５ 等速ジョイント用内輪
１６ ボール
１７ スプライン軸
１８ 外径側係合溝
１９ 第二の雌スプライン孔
２０ 内径側係合溝
２１ 保持器
２２ 雄ねじ部
２３ ナット
２４ 伝達軸
２５ 雄スプライン部
２６ デファレンシャル側等速ジョイント
２７ トラニオン
２８ かしめ部
２９ 段差面
３０ 車輪駆動用転がり軸受ユニット
３１ 止め輪
３２ 係止段部
３３ 係止溝
３４ 車輪用駆動ユニット 1, 1a, 1b Rolling bearing unit for driving wheel 2 Wheel side constant velocity joint 3 Outer ring 4, 4a, 4b hub
5 inner ring 6 rolling element 7 first flange 8 outer ring raceway 9 second flange 10 first inner ring raceway 11 small diameter step portion 12 second inner ring raceway 13 female spline hole 14 outer ring for constant velocity joint 15 inner ring for constant velocity joint 16 ball 17 spline shaft 18 outer diameter side engaging groove 19 second female spline hole 20 inner diameter side engaging groove 21 cage 22 male screw portion 23 nut 24 transmission shaft 25 male spline portion 26 differential side constant velocity joint 27 trunnion 28 caulking Section 29 Stepped surface 30 Rolling bearing unit for driving wheel 31 Retaining ring 32 Locking step 33 Locking groove 34 Wheel drive unit

Claims (2)

外輪と、ハブと、内輪と、複数の転動体とを備え、
このうちの外輪は、外周面に懸架装置に結合固定する為の第一のフランジを、内周面に複列の外輪軌道を、それぞれ有するものであり、
上記ハブは、中心部に雌スプライン孔を、外周面の外端寄り部分に駆動輪を支持固定する為の第二のフランジを、外周面の中間部に直接又は別体の内輪を介して第一の内輪軌道を、外周面の内端寄り部分に嵌合円筒面部を、それぞれ有するものであり、
上記内輪は、外周面に第二の内輪軌道を有し、上記嵌合円筒面部に外嵌した状態で、上記ハブの内端部に形成された円筒部を径方向外方に塑性変形させて形成されたかしめ部で内端面を抑え付けられて、上記ハブに固定されたものであり、
上記各転動体は、上記複列の外輪軌道と上記第一、第二の内輪軌道との間に、それぞれ複数個ずつ転動自在に設けられているものである駆動輪用転がり軸受ユニットの製造方法であって、
上記ハブの中心部に雌スプライン孔を形成する一次加工を施した後、上記かしめ部を形成する加工を行ない、その後、上記ハブの雌スプライン孔の、このかしめ部の形成によって縮径したものを再加工する二次加工を行なう駆動輪用転がり軸受ユニットの製造方法。 An outer ring, a hub, an inner ring, and a plurality of rolling elements;
Of these, the outer ring has a first flange for coupling and fixing to the suspension device on the outer peripheral surface, and a double row outer ring raceway on the inner peripheral surface.
The hub has a female spline hole at the center, a second flange for supporting and fixing the drive wheel near the outer end of the outer peripheral surface, and a second inner flange directly or via a separate inner ring on the outer peripheral surface. Each having an inner ring raceway and a fitting cylindrical surface portion on the inner end portion of the outer peripheral surface,
The inner ring has a second inner ring raceway on an outer peripheral surface, and in a state where the inner ring is fitted on the fitting cylindrical surface part, the cylindrical part formed on the inner end part of the hub is plastically deformed radially outward. The inner end face is suppressed by the formed caulking portion, and is fixed to the hub.
Each of the rolling elements is a rolling bearing unit for a drive wheel, wherein a plurality of rolling elements are provided between the double row outer ring raceway and the first and second inner ring raceways. A method,
After the primary processing for forming the female spline hole at the center of the hub is performed, the processing for forming the caulking portion is performed, and then the diameter of the female spline hole of the hub is reduced by forming the caulking portion. A manufacturing method of a rolling bearing unit for a drive wheel that performs secondary processing to be reworked. デファレンシャルギヤの出力部に結合されるデファレンシャル側等速ジョイントと、このデファレンシャル側等速ジョイントの出力部に内端部を結合された伝達軸と、この伝達軸の外端部に入力部を結合された車輪側等速ジョイントと、この車輪側等速ジョイントの出力部に結合された駆動輪用転がり軸受ユニットとから成る車輪用駆動ユニットであって、
この駆動輪用転がり軸受ユニットが、外輪と、ハブと、内輪と、複数の転動体とを備え、
このうちの外輪は、外周面に懸架装置に結合固定する為の第一のフランジを、内周面に複列の外輪軌道を、それぞれ有するものであり、
上記ハブは、中心部に雌スプライン孔を、外周面の外端寄り部分に駆動輪を支持固定する為の第二のフランジを、外周面の中間部に直接又は別体の内輪を介して第一の内輪軌道を、外周面の内端寄り部分に嵌合円筒面部を、それぞれ有するものであり、
上記内輪は、外周面に第二の内輪軌道を有し、上記嵌合円筒面部に外嵌した状態で、上記ハブの内端部に形成された円筒部を径方向外方に塑性変形させて形成されたかしめ部で内端面を抑え付けられて、上記ハブに固定されたものであり、
上記各転動体は、上記複列の外輪軌道と上記第一、第二の内輪軌道との間に、それぞれ複数個ずつ転動自在に設けられているものであり、
上記駆動輪用転がり軸受ユニットを構成するハブに設けた雌スプライン孔と、上記車輪側等速ジョイントの出力部に設けたスプライン軸とをスプライン係合させている車輪用駆動ユニットの製造方法であって、
上記駆動輪用転がり軸受ユニットを請求項１に記載した駆動輪用転がり軸受ユニットの製造方法により製造する、車輪用駆動ユニットの製造方法。 A differential side constant velocity joint coupled to the output portion of the differential gear, a transmission shaft having an inner end portion coupled to the output portion of the differential side constant velocity joint, and an input portion coupled to the outer end portion of the transmission shaft. A wheel drive unit comprising: a wheel side constant velocity joint; and a drive wheel rolling bearing unit coupled to an output portion of the wheel side constant velocity joint ,
This driving wheel rolling bearing unit includes an outer ring, a hub, an inner ring, and a plurality of rolling elements,
Of these, the outer ring has a first flange for coupling and fixing to the suspension device on the outer peripheral surface, and a double row outer ring raceway on the inner peripheral surface.
The hub has a female spline hole at the center, a second flange for supporting and fixing the drive wheel near the outer end of the outer peripheral surface, and a second inner flange directly or via a separate inner ring on the outer peripheral surface. Each having an inner ring raceway and a fitting cylindrical surface portion on the inner end portion of the outer peripheral surface,
The inner ring has a second inner ring raceway on an outer peripheral surface, and in a state where the inner ring is fitted on the fitting cylindrical surface part, the cylindrical part formed on the inner end part of the hub is plastically deformed radially outward. The inner end face is suppressed by the formed caulking portion, and is fixed to the hub.
Each of the rolling elements is provided between the double row outer ring raceway and the first and second inner ring raceways so as to be capable of rolling, respectively.
A female spline hole formed in the hub constituting the drive wheel rolling bearing unit, a manufacturing method for a wheel drive unit and a spline shaft provided at the output portion of the wheel side constant velocity joint are splined And
A method for manufacturing a wheel driving unit , wherein the driving wheel rolling bearing unit is manufactured by the method for manufacturing a driving wheel rolling bearing unit according to claim 1 .
JP2005108648A 2005-04-05 2005-04-05 Rolling bearing unit for driving wheel and method for manufacturing driving unit for wheel Expired - Lifetime JP3736571B2 (en)

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