JP2009144879A - Bearing device for wheel - Google Patents

Bearing device for wheel Download PDF

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JP2009144879A
JP2009144879A JP2007325404A JP2007325404A JP2009144879A JP 2009144879 A JP2009144879 A JP 2009144879A JP 2007325404 A JP2007325404 A JP 2007325404A JP 2007325404 A JP2007325404 A JP 2007325404A JP 2009144879 A JP2009144879 A JP 2009144879A
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Prior art keywords
inner ring
hub
wheel
annular groove
bearing device
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JP2007325404A
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Japanese (ja)
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Hiroshi Fujimura
啓 藤村
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2007325404A priority Critical patent/JP2009144879A/en
Publication of JP2009144879A publication Critical patent/JP2009144879A/en
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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)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel provided with an annular groove preventing flaring of an inner ring when caulking, not causing cracks in the annular groove even under the severe conditions of use of a bearing. <P>SOLUTION: This bearing device for the wheel includes an outer member, an inner member 2, an a plurality of rows of rolling elements. The inner member 2 is composed of a hub ring 9 and an inner ring. An annular end portion 9c extending from the inner ring fitting portion 12 of the hub ring 9 to an inboard side is caulked to form a caulked portion engaged with the end surface of the inner ring on an inboard side. The annular groove 14 with a diameter formed smaller than that of the other portion is formed from the position of the end of the inner ring on the inboard side on the outer peripheral surface of the hub ring 9 to an outboard side, and the surface of the annular groove 14 is flatly and smoothly finished by a grinding process. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は、自動車等の車輪を回転自在に支持する車輪用軸受装置に関する。   The present invention relates to a wheel bearing device that rotatably supports a wheel of an automobile or the like.

外方部材と内方部材の対向する軌道面間にボールからなる転動体を複列に介在させ、上記内方部材を、車輪取付用ハブフランジを外周に有するハブ輪と、このハブ輪のインボード側端の外周に嵌合した内輪とで構成した形式の車輪用軸受装置がある（例えば特許文献１）。この形式の車輪用軸受装置では、ハブ輪のインボード側端部の外周に形成した段部状の内輪嵌合部に内輪を外嵌させ、ハブ輪の内輪嵌合部からインボード側に延びる環状端部を外径側に加締めて、内輪のインボード側の端面に係合する加締部とすることにより、外力による内輪の抜けを防止している。   Rolling elements composed of balls are interposed between the opposing raceway surfaces of the outer member and the inner member in a double row, and the inner member is connected to a hub wheel having a wheel mounting hub flange on the outer periphery, and an inner side of the hub wheel. There is a wheel bearing device of a type constituted by an inner ring fitted to the outer periphery of the board side end (for example, Patent Document 1). In this type of wheel bearing device, the inner ring is fitted on a stepped inner ring fitting portion formed on the outer periphery of the inboard side end portion of the hub wheel, and extends from the inner ring fitting portion of the hub wheel to the inboard side. The annular end portion is crimped to the outer diameter side to form a crimped portion that engages with the end surface of the inner ring on the inboard side, thereby preventing the inner ring from coming off due to an external force.

特許文献１には、加締め時に内輪が外径側に押し広げられるのを抑制するために、加締め前のハブ輪の外周面に、その一部が内輪のインボード側の端面と軸方向位置が重なるように、他の部分よりも小径に形成された環状溝（環状溝）を設けることが記載されている。
特開２００２−１３９０６０号公報 In Patent Document 1, in order to prevent the inner ring from being pushed and expanded to the outer diameter side during caulking, a part of the outer ring of the hub ring before caulking is axially aligned with the end surface on the inboard side of the inner ring. It is described that an annular groove (annular groove) formed with a smaller diameter than other portions is provided so that the positions overlap.
JP 2002-139060 A

上記環状溝を設ける場合、従来は図７または図８に示すように、内輪１０と嵌合するハブ輪９の外周部分は研削加工で平滑に仕上げられるが、環状溝１４の外周面は鋳造された状態のままとされていた。図において、一点鎖線１５を付した箇所が研削加工された面を示す。図の状態から、ハブ輪９の環状端部９ｃを外径側に加締めて、内輪（図示せず）のインボード側の端面に係合させる。このような車輪用軸受装置では、環状溝１４の外周面の表面粗さが粗いため、車輪用軸受装置に外力が加わった場合に、環状溝１４表面の凹部で応力集中が生じやすい。そのため、過酷な軸受使用条件下で、環状溝１４にクラックが発生してハブ輪が破損することがあった。   When the annular groove is provided, conventionally, as shown in FIG. 7 or FIG. 8, the outer peripheral portion of the hub wheel 9 fitted to the inner ring 10 is finished smoothly by grinding, but the outer peripheral surface of the annular groove 14 is cast. It was supposed to remain in the state. In the figure, a portion marked with a chain line 15 shows a ground surface. From the state shown in the figure, the annular end portion 9c of the hub wheel 9 is crimped to the outer diameter side and engaged with the end face of the inner ring (not shown) on the inboard side. In such a wheel bearing device, since the surface roughness of the outer peripheral surface of the annular groove 14 is rough, when an external force is applied to the wheel bearing device, stress concentration tends to occur in the recesses on the surface of the annular groove 14. Therefore, a crack may occur in the annular groove 14 under severe bearing use conditions, and the hub wheel may be damaged.

この発明の目的は、加締め時の内輪押し広げを防止する環状溝を設けた車輪用軸受装置において、過酷な軸受使用条件下でも環状溝にクラックが発生しないようにすることである。   An object of the present invention is to prevent a crack from occurring in an annular groove even under severe bearing use conditions in a wheel bearing device provided with an annular groove that prevents the inner ring from being pushed and spread during caulking.

この発明の車輪用軸受装置は、内周に複列の軌道面を有する外方部材と、前記各軌道面に対向する軌道面を外周に有する内方部材と、これら対向する軌道面の間に介在した複列の転動体とを備え、前記内方部材が車軸取付用のフランジを外周に有するハブ輪と、このハブ輪のインボード側部の外周に設けられた段部状の内輪嵌合部に嵌合した内輪とでなり、前記ハブ輪および内輪に各列の前記軌道面を有し、前記ハブ輪の内輪嵌合部からインボード側に延びる環状端部を加締めて、前記内輪のインボード側の端面に係合する加締部とした車輪用軸受装置であって、前記ハブ輪の外周面における前記内輪のインボード側端の位置からアウトボード側にかけて、他の部分よりも小径に形成された環状溝を設け、この環状溝の表面を研削加工面としたことを特徴とする。環状溝の表面粗さは１．３μｍＲａ以下とするのが望ましい。
ハブ輪の内輪嵌合部からインボード側に延びる環状端部を加締めて、内輪のインボード側の端面に係合する加締部としてあるため、外力による内輪の抜けを防止できる。環状溝の表面が研削加工で平滑に仕上げられているため、環状溝の表面で応力集中が生じにくく、環状溝でのクラックの発生を防止できる。これにより、過酷な軸受使用条件下でも耐え得る車輪用軸受装置とすることができる。 The wheel bearing device according to the present invention includes an outer member having a double-row raceway surface on an inner periphery, an inner member having an outer periphery raceway surface facing each of the raceway surfaces, and the facing raceway surface. A hub wheel provided with interposing double-row rolling elements, the inner member having an axle mounting flange on the outer periphery, and a stepped inner ring fitting provided on the outer periphery of the inboard side portion of the hub wheel An inner ring fitted to the inner ring, the hub ring and the inner ring having the raceway surface in each row, and crimping an annular end extending from the inner ring fitting part of the hub ring to the inboard side, A bearing device for a wheel that is a caulking portion that engages with an end surface on the inboard side of the inner ring, from the position of the inboard side end of the inner ring on the outer peripheral surface of the hub wheel to the outboard side, than other parts An annular groove formed with a small diameter is provided, and the surface of this annular groove is used as a grinding surface. It is characterized in. The surface roughness of the annular groove is preferably 1.3 μmRa or less.
Since the annular end portion extending from the inner ring fitting portion of the hub wheel to the inboard side is swaged to be engaged with the end surface of the inner ring on the inboard side, the inner ring can be prevented from coming off due to an external force. Since the surface of the annular groove is finished smoothly by grinding, stress concentration hardly occurs on the surface of the annular groove, and the occurrence of cracks in the annular groove can be prevented. Thereby, it can be set as the wheel bearing apparatus which can endure even under severe bearing use conditions.

この発明において、前記環状溝のアウトボード側に続く前記ハブ輪の外周面を、環状溝の表面と同時に研削加工で仕上げることができる。
環状溝と同時にハブ輪の外周面を研削加工すれば、加工能率がよい。 In this invention, the outer peripheral surface of the hub wheel following the outboard side of the annular groove can be finished by grinding simultaneously with the surface of the annular groove.
If the outer peripheral surface of the hub ring is ground simultaneously with the annular groove, the processing efficiency is good.

この発明において、前記ハブ輪を、炭素量が０．４５ないし０．８Ｗｔ％、好ましくは０．６ないし０．８Ｗｔ％の炭素鋼で形成し、所定の部位に高周波焼入れにより表面硬化層を形成することが望ましい。また、前記内輪を、炭素量が０．６ないし０．８Ｗｔ％の炭素鋼で形成し、芯部まで焼入れ硬化させることが望ましい。
ハブ輪および内輪を上記材質とすることにより、高炭素鋼よりも炭素量が少ない分、所望の転動疲労寿命を維持しながら、加工性（鍛造加工）を向上させることができる。また、ハブ輪については所望の部位に高周波焼入れによる表面硬化層、内輪について芯部までの焼入れ硬化により、硬度の低下を抑制して転動寿命疲労を向上させられる。 In the present invention, the hub ring is made of carbon steel having a carbon content of 0.45 to 0.8 Wt%, preferably 0.6 to 0.8 Wt%, and a hardened surface layer is formed by induction hardening at a predetermined portion. It is desirable to do. Further, it is desirable that the inner ring is made of carbon steel having a carbon content of 0.6 to 0.8 Wt% and is hardened and hardened to the core.
By using the hub ring and the inner ring as the above materials, the workability (forging process) can be improved while maintaining the desired rolling fatigue life by the amount of carbon less than that of the high carbon steel. In addition, the surface of the hub ring is hardened by induction hardening at a desired portion, and the inner ring is quenched and hardened to the core portion, thereby suppressing the decrease in hardness and improving the rolling life fatigue.

前記ハブ輪は車軸と一体とすることができる。
ハブ輪が車軸と一体であると、車輪用軸受装置の構造を簡略化でき、かつ重量を軽減できる。 The hub wheel may be integral with the axle.
When the hub wheel is integral with the axle, the structure of the wheel bearing device can be simplified and the weight can be reduced.

この発明の車輪用軸受装置は、内周に複列の軌道面を有する外方部材と、前記各軌道面に対向する軌道面を外周に有する内方部材と、これら対向する軌道面の間に介在した複列の転動体とを備え、前記内方部材が車軸取付用のフランジを外周に有するハブ輪と、このハブ輪のインボード側部の外周に設けられた段部状の内輪嵌合部に嵌合した内輪とでなり、前記ハブ輪および内輪に各列の前記軌道面を有し、前記ハブ輪の内輪嵌合部からインボード側に延びる環状端部を加締めて、前記内輪のインボード側の端面に係合する加締部とした車輪用軸受装置であって、前記ハブ輪の外周面における前記内輪のインボード側端の位置からアウトボード側にかけて、他の部分よりも小径に形成された環状溝を設け、この環状溝の表面を研削加工面としたため、過酷な軸受使用条件下でも環状溝にクラックが発生しないようにすることができる。   The wheel bearing device according to the present invention includes an outer member having a double-row raceway surface on an inner periphery, an inner member having an outer periphery raceway surface facing each of the raceway surfaces, and the facing raceway surface. A hub wheel provided with interposing double-row rolling elements, the inner member having an axle mounting flange on the outer periphery, and a stepped inner ring fitting provided on the outer periphery of the inboard side portion of the hub wheel An inner ring fitted to the inner ring, the hub ring and the inner ring having the raceway surface in each row, and crimping an annular end extending from the inner ring fitting part of the hub ring to the inboard side, A bearing device for a wheel that is a caulking portion that engages with an end surface on the inboard side of the inner ring, from the position of the inboard side end of the inner ring to the outboard side on the outer peripheral surface of the hub wheel, more than other portions. An annular groove formed with a small diameter is provided, and the surface of this annular groove is used as a grinding surface. Therefore, it is possible to ensure that the crack does not occur in the annular groove under severe bearing use conditions.

この発明の第１の実施形態を図１ないし図３と共に説明する。この実施形態は、第３世代型の内輪回転タイプで、かつ従動輪支持用の車輪用軸受装置に適用したものである。なお、この明細書において、車両に取付けた状態で車両の車幅方向外側寄りとなる側をアウトボード側と呼び、車両の中央寄りとなる側をインボード側と呼ぶ。   A first embodiment of the present invention will be described with reference to FIGS. This embodiment is a third generation inner ring rotating type and is applied to a wheel bearing device for supporting a driven wheel. In this specification, the side closer to the outer side in the vehicle width direction of the vehicle when attached to the vehicle is referred to as the outboard side, and the side closer to the center of the vehicle is referred to as the inboard side.

図１に示すように、この車輪用軸受装置は、内周に複列の軌道面３を形成した外方部材１と、これら各軌道面３に対向する軌道面４を形成した内方部材２と、これら外方部材１および内方部材２の軌道面３，４間に介在した複列のボールからなる転動体５とで構成される。この車輪用軸受装置は、複列外向きアンギュラ玉軸受型とされていて、転動体５は各列毎に保持器６で保持されている。外方部材１と内方部材２との間の軸受空間の両端は、シール手段７，８によりそれぞれ密封されている。   As shown in FIG. 1, the wheel bearing device includes an outer member 1 having a double-row raceway surface 3 formed on the inner periphery, and an inner member 2 having a raceway surface 4 opposed to each raceway surface 3. And rolling elements 5 composed of double-row balls interposed between the raceway surfaces 3 and 4 of the outer member 1 and the inner member 2. This wheel bearing device is a double-row outward angular ball bearing type, and the rolling elements 5 are held by a cage 6 for each row. Both ends of the bearing space between the outer member 1 and the inner member 2 are sealed by sealing means 7 and 8, respectively.

外方部材１は固定側の部材となるものであって、車体の懸架装置（図示せず）におけるナックルに取付けるフランジ１ａを外周に有し、全体が一体の部品とされている。
内方部材２は回転側の部材となるものであって、外周に車輪取付用のハブフランジ９ａを有するハブ輪９と、このハブ輪９の中実軸部９ｂのインボード側端の外周に嵌合した内輪１０とでなる。これらハブ輪９および内輪１０に、前記各列の軌道面４が形成されている。車輪（図示せず）はブレーキロータ（図示せず）と共に、ハブボルト１７でハブフランジ９ａに取付けられる。 The outer member 1 is a member on the fixed side, and has a flange 1a attached to the knuckle in the suspension device (not shown) of the vehicle body on the outer periphery, and the whole is an integral part.
The inner member 2 is a member on the rotation side, and has a hub wheel 9 having a hub flange 9a for wheel mounting on the outer periphery, and an outer periphery on the inboard side end of the solid shaft portion 9b of the hub wheel 9. The inner ring 10 is fitted. The hub ring 9 and the inner ring 10 are formed with the raceway surfaces 4 of the respective rows. A wheel (not shown) is attached to the hub flange 9a with a hub bolt 17 together with a brake rotor (not shown).

ハブ輪９は、炭素量が０．４５ないし０．８Ｗｔ％、好ましくは０．６ないし０．８Ｗｔ％の炭素鋼からなり、軌道面４を含む外周面に高周波焼入れによる表面硬化層１１が形成されている。また、内輪１０は、炭素量が０．６ないし０．８Ｗｔ％の炭素鋼からなり、芯部まで焼入れ硬化させてある。   The hub wheel 9 is made of carbon steel having a carbon content of 0.45 to 0.8 Wt%, preferably 0.6 to 0.8 Wt%, and a hardened surface layer 11 is formed on the outer peripheral surface including the raceway surface 4 by induction hardening. Has been. The inner ring 10 is made of carbon steel having a carbon content of 0.6 to 0.8 Wt%, and is hardened and hardened to the core.

ハブ輪軸部９ｂのインボード側端の外周には、他の部分よりも小径となった段部状の内輪嵌合部１２が形成され、この内輪嵌合部１２に内輪１０が嵌合している。内輪嵌合部１２から内輪１０が脱落するのを防止するために、ハブ輪軸部９ｂの内輪嵌合部１２からインボード側に延びる環状端部９ｃ（図２）を外径側に加締めて、内輪１０のインボード側の端面に係合する加締部１３（図１）としてある。   A step-shaped inner ring fitting portion 12 having a smaller diameter than the other portion is formed on the outer periphery of the inboard side end of the hub ring shaft portion 9b, and the inner ring 10 is fitted to the inner ring fitting portion 12. Yes. In order to prevent the inner ring 10 from falling off from the inner ring fitting part 12, an annular end 9c (FIG. 2) extending from the inner ring fitting part 12 of the hub wheel shaft part 9b to the inboard side is crimped to the outer diameter side. The caulking portion 13 (FIG. 1) that engages with the end face of the inner ring 10 on the inboard side.

図２は加締部１３を加締める前の状態を示す車輪用軸受装置の全体図、図３は同車輪用軸受装置のハブ輪９の部分拡大図である。加締部１３となる環状端部９ｃは、ハブ輪軸部９ｂと同じ外径を有するストレートな円筒状であり、その先端部は外周側および内周側共に断面円弧状の丸みが付けられている。ハブ輪軸部９ｂの外周面には、環状端部９ｃの根元部からアウトボード側にかけて、他の部分よりも小径に形成された環状溝１４が設けられている。環状端部９ｃの根元部は、内輪１０のインボード側端と軸方向同位置にある。   FIG. 2 is an overall view of the wheel bearing device showing a state before the crimping portion 13 is crimped, and FIG. 3 is a partially enlarged view of the hub wheel 9 of the wheel bearing device. The annular end portion 9c serving as the crimping portion 13 is a straight cylindrical shape having the same outer diameter as the hub wheel shaft portion 9b, and the tip end portion thereof is rounded in a circular arc shape on both the outer peripheral side and the inner peripheral side. . On the outer peripheral surface of the hub wheel shaft portion 9b, an annular groove 14 formed with a smaller diameter than the other portions is provided from the root portion of the annular end portion 9c to the outboard side. The root portion of the annular end portion 9 c is located at the same position in the axial direction as the inboard side end of the inner ring 10.

上記環状溝１４の外周面は、ハブ輪軸部９ｂの外周面と同様に、研削加工により表面が平滑に仕上げられている。図３において、一点鎖線１５を付した箇所が研削加工された面を示す。研削加工後の環状溝１４外周面の粗さは、１．３μｍＲａ以下とするのが望ましい。環状溝１４の外周面とハブ輪軸部９ｂの外周面とは、同時に研削加工するたことができる。同時に研削加工すれば、加工能率がよい   Similar to the outer peripheral surface of the hub wheel shaft portion 9b, the outer peripheral surface of the annular groove 14 is finished with a smooth surface by grinding. In FIG. 3, the part which attached the dashed-dotted line 15 shows the surface by which the grinding process was carried out. The roughness of the outer peripheral surface of the annular groove 14 after grinding is preferably 1.3 μmRa or less. The outer peripheral surface of the annular groove 14 and the outer peripheral surface of the hub wheel shaft portion 9b can be ground simultaneously. If you grind at the same time, the processing efficiency is good

この構成の車輪用軸受装置によると、ハブ輪９の内輪嵌合部１２からインボード側に延びる環状端部９ｃを加締めて、内輪１０のインボード側の端面に係合する加締部１３としてあるため、外力による内輪１０の抜けを防止できる。環状溝１４の表面が研削加工で平滑に仕上げられているため、環状溝１４の表面で応力集中が生じにくく、環状溝１４でのクラックの発生を防止できる。これにより、過酷な軸受使用条件下でも耐え得る車輪用軸受装置とすることができる。   According to the wheel bearing device with this configuration, the annular end portion 9c extending from the inner ring fitting portion 12 of the hub wheel 9 toward the inboard side is swaged, and the swaged portion 13 engaged with the end surface of the inner ring 10 on the inboard side. Therefore, it is possible to prevent the inner ring 10 from being pulled out by an external force. Since the surface of the annular groove 14 is finished smoothly by grinding, stress concentration hardly occurs on the surface of the annular groove 14, and the occurrence of cracks in the annular groove 14 can be prevented. Thereby, it can be set as the wheel bearing apparatus which can endure even under severe bearing use conditions.

ハブ輪９は、炭素量が０．４５ないし０．８Ｗｔ％、好ましくは０．６ないし０．８Ｗｔ％の炭素鋼からなり、かつ内輪１０は、炭素量が０．６ないし０．８Ｗｔ％の炭素鋼からなり、両者共に、ＳＵＪ２（炭素量が０．９５ないし１．１Ｗｔ％）等の高炭素鋼よりも炭素量が少ない分、所望の転動疲労寿命を維持しながら、加工性（鍛造加工）を向上させることができる。なお、炭素量が０．８Ｗｔ％より多くなると、加工性、被切削性、および靭性が低下するため、０．８Ｗｔ％を上限とするのがよい。
また、ハブ輪９については、軌道面４に高周波焼入れによる表面硬化層１１を形成し、かつ内輪１０については、芯部まで焼入れ硬化させてあるため、硬度の低下を抑制して転動寿命疲労を向上させられる。 The hub ring 9 is made of carbon steel having a carbon content of 0.45 to 0.8 Wt%, preferably 0.6 to 0.8 Wt%, and the inner ring 10 is made of carbon having a carbon content of 0.6 to 0.8 Wt%. Both are made of carbon steel, both of which are less workable than high carbon steel such as SUJ2 (carbon content is 0.95 to 1.1 Wt%), while maintaining the desired rolling fatigue life while maintaining workability (forging Processing) can be improved. Note that if the carbon content exceeds 0.8 Wt%, the workability, machinability, and toughness deteriorate, so 0.8 Wt% is preferably set as the upper limit.
Further, the hub ring 9 is formed with a hardened surface layer 11 by induction hardening on the raceway surface 4 and the inner ring 10 is hardened and hardened to the core portion. Can be improved.

さらに、この実施形態では、ハブ輪９が車軸と一体とされているため、車輪用軸受装置の構造を簡略化でき、かつ重量を軽減できる。   Furthermore, in this embodiment, since the hub wheel 9 is integrated with the axle, the structure of the wheel bearing device can be simplified and the weight can be reduced.

図４ないし図６はこの発明の第２の実施形態を示す。この実施形態は、第３世代型の内輪回転タイプで、かつ駆動輪支持用の車輪用軸受装置に適用したものである。この車輪用軸受装置は駆動輪支持用であるため、従動輪支持用である第１の実施形態と異なり、ハブ輪９の中心に、車軸（図示せず）を挿通するための貫通孔１６を有する。貫通孔１６の内周面は、貫通孔１６の大半を占めスプライン溝１６ａａが形成された一般径部１６ａと、この一般径部１６ａよりもインボード側で一般径部１６ａよりも大径の大径部１６ｂとからなる。他の構成は第１の実施形態と同様であるので、同一構成箇所については、同一符合を付して表示し、説明は省略する。   4 to 6 show a second embodiment of the present invention. This embodiment is a third generation type inner ring rotation type and is applied to a wheel bearing device for driving wheel support. Since this wheel bearing device is for driving wheel support, unlike the first embodiment for driving wheel support, a through hole 16 for inserting an axle (not shown) is inserted in the center of the hub wheel 9. Have. The inner peripheral surface of the through hole 16 occupies most of the through hole 16 and has a general diameter portion 16a in which a spline groove 16aa is formed, and a larger diameter than the general diameter portion 16a on the inboard side of the general diameter portion 16a. It consists of a diameter part 16b. Since other configurations are the same as those in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

この実施形態も、前記同様、内輪嵌合部１２から内輪１０が脱落するのを防止するために、ハブ輪軸部９ｂの内輪嵌合部１２からインボード側に延びる環状端部９ｃ（図５）を外径側に加締めて、内輪１０のインボード側の端面に係合する加締部１３（図４）としてある。
図５は加締部１２を加締める前の状態を示す車輪用軸受装置の全体図、図６は同車輪用軸受装置のハブ輪９の部分拡大図である。加締部１３となる環状端部９ｃは、ハブ輪軸部９ｂの内周面が大径部１６ｂである部分と同じ外径および内径を有するストレートな円筒状であり、その先端部は外周側および内周側共に断面円弧状の丸みが付けられている。ハブ輪軸部９ｂの外周面には、環状端部９ｃとの境界からアウトボード側にかけて、他の部分よりも小径に形成された環状溝１４が設けられている。ハブ輪軸部９ｂと環状端部９ｃの境界は、内輪１０のインボード側端と軸方向同位置である。また、環状溝１４の外周面およびハブ輪軸部９ｂの外周面は、研削加工により表面が平滑に仕上げられている。これにより、第１の実施形態と同様の効果が得られる。 In this embodiment as well, in order to prevent the inner ring 10 from falling off from the inner ring fitting portion 12, an annular end portion 9c (FIG. 5) extending from the inner ring fitting portion 12 of the hub ring shaft portion 9b to the inboard side. Is crimped to the outer diameter side to be engaged with the end face of the inner ring 10 on the inboard side as a crimping portion 13 (FIG. 4).
FIG. 5 is an overall view of the wheel bearing device showing a state before the crimping portion 12 is crimped, and FIG. 6 is a partially enlarged view of the hub wheel 9 of the wheel bearing device. The annular end portion 9c serving as the crimping portion 13 is a straight cylindrical shape having the same outer diameter and inner diameter as the portion where the inner peripheral surface of the hub wheel shaft portion 9b is the large diameter portion 16b. Both inner peripheral sides are rounded with a circular arc cross section. On the outer peripheral surface of the hub wheel shaft portion 9b, an annular groove 14 formed with a smaller diameter than other portions is provided from the boundary with the annular end portion 9c to the outboard side. The boundary between the hub wheel shaft portion 9b and the annular end portion 9c is the same position in the axial direction as the inboard side end of the inner ring 10. Further, the outer peripheral surface of the annular groove 14 and the outer peripheral surface of the hub wheel shaft portion 9b are finished with a smooth surface by grinding. Thereby, the effect similar to 1st Embodiment is acquired.

上記各実施形態は第３世代型の内輪回転タイプとしたが、この発明は、他のタイプの車輪用軸受装置にも適用できる。   Although each said embodiment was made into the 3rd generation type inner ring | wheel rotation type, this invention is applicable also to the bearing apparatus for other types of wheels.

この発明の第１の実施形態にかかる車輪用軸受装置の断面図である。It is sectional drawing of the wheel bearing apparatus concerning 1st Embodiment of this invention. 同車輪用軸受装置のハブ輪加締加工前の断面図である。It is sectional drawing before the hub ring caulking process of the bearing apparatus for the wheels. 同ハブ輪の部分拡大図である。It is the elements on larger scale of the hub wheel. この発明の第２の実施形態にかかる車輪用軸受装置の断面図である。It is sectional drawing of the wheel bearing apparatus concerning 2nd Embodiment of this invention. 同車輪用軸受装置のハブ輪加締加工前の断面図である。It is sectional drawing before the hub ring caulking process of the bearing apparatus for the wheels. 同ハブ輪の部分拡大図である。It is the elements on larger scale of the hub wheel. 従来の車輪用軸受装置の部分断面図である。It is a fragmentary sectional view of the conventional wheel bearing apparatus. 異なる従来の車輪用軸受装置の部分断面図である。It is a fragmentary sectional view of a different conventional wheel bearing device.

符号の説明Explanation of symbols

１…外方部材
２…内方部材
３…外方部材の軌道面
４…内方部材の軌道面
５…転動体
９…ハブ輪
９ａ…ハブフランジ
９ｂ…軸部
９ｃ…環状端部
１０…内輪
１１…表面硬化層
１２…内輪嵌合部
１３…加締部
１４…環状溝 DESCRIPTION OF SYMBOLS 1 ... Outer member 2 ... Inner member 3 ... Outer member raceway surface 4 ... Inner member raceway surface 5 ... Rolling element 9 ... Hub ring 9a ... Hub flange 9b ... Shaft part 9c ... Ring end 10 ... Inner ring DESCRIPTION OF SYMBOLS 11 ... Hard surface layer 12 ... Inner ring fitting part 13 ... Clamping part 14 ... Annular groove

Claims (6)

内周に複列の軌道面を有する外方部材と、前記各軌道面に対向する軌道面を外周に有する内方部材と、これら対向する軌道面の間に介在した複列の転動体とを備え、前記内方部材が車軸取付用のフランジを外周に有するハブ輪と、このハブ輪のインボード側部の外周に設けられた段部状の内輪嵌合部に嵌合した内輪とでなり、前記ハブ輪および内輪に各列の前記軌道面を有し、前記ハブ輪の内輪嵌合部からインボード側に延びる環状端部を加締めて、前記内輪のインボード側の端面に係合する加締部とした車輪用軸受装置であって、
前記ハブ輪の外周面における前記内輪のインボード側端の位置からアウトボード側にかけて、他の部分よりも小径に形成された環状溝を設け、この環状溝の表面を研削加工面としたことを特徴とする車輪用軸受装置。 An outer member having a double-row raceway surface on the inner periphery, an inner member having a raceway surface facing each of the raceway surfaces on the outer periphery, and a double-row rolling element interposed between the opposing raceway surfaces And the inner member includes a hub ring having a flange for mounting an axle on an outer periphery, and an inner ring fitted to a stepped inner ring fitting portion provided on the outer periphery of the inboard side portion of the hub wheel. The hub ring and the inner ring each have the raceway surface in each row, and are engaged with the end face of the inner ring on the inboard side by crimping an annular end portion extending from the inner ring fitting portion to the inboard side. A bearing device for a wheel as a caulking portion to be
An annular groove having a smaller diameter than the other part is provided from the position of the inboard side end of the inner ring on the outer peripheral surface of the hub wheel to the outboard side, and the surface of the annular groove is used as a grinding surface. A wheel bearing device. 請求項１において、前記環状溝の表面粗さを１．３μｍＲａ以下とした車輪用軸受装置。   The wheel bearing device according to claim 1, wherein a surface roughness of the annular groove is 1.3 μmRa or less. 請求項１または請求項２において、前記環状溝のアウトボード側に続く前記ハブ輪の外周面を、環状溝の表面と同時に研削加工で仕上げた車輪用軸受装置。   The wheel bearing device according to claim 1 or 2, wherein the outer peripheral surface of the hub wheel following the outboard side of the annular groove is finished by grinding simultaneously with the surface of the annular groove. 請求項１ないし請求項３のいずれか１項において、前記ハブ輪を、炭素量が０．４５ないし０．８Ｗｔ％の炭素鋼で形成し、所定の部位に高周波焼入れにより表面硬化層を形成した車輪用軸受装置。   The hub ring according to any one of claims 1 to 3, wherein the hub ring is made of carbon steel having a carbon content of 0.45 to 0.8 Wt%, and a hardened surface layer is formed at a predetermined portion by induction hardening. Wheel bearing device. 請求項１ないし請求項４のいずれか１項において、前記内輪を、炭素量が０．６ないし０．８Ｗｔ％の炭素鋼で形成し、芯部まで焼入れ硬化させた車輪用軸受装置。   5. The wheel bearing device according to claim 1, wherein the inner ring is made of carbon steel having a carbon content of 0.6 to 0.8 Wt%, and is hardened and hardened to a core part. 請求項１ないし請求項５のいずれか１項において、前記ハブ輪は車軸と一体である車輪用軸受装置。   The wheel bearing device according to any one of claims 1 to 5, wherein the hub wheel is integrated with an axle.
JP2007325404A 2007-12-18 2007-12-18 Bearing device for wheel Pending JP2009144879A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016200212A (en) * 2015-04-10 2016-12-01 株式会社ジェイテクト Hub unit and manufacturing method of the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016200212A (en) * 2015-04-10 2016-12-01 株式会社ジェイテクト Hub unit and manufacturing method of the same

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