JP2013203107A - Bearing device for wheel - Google Patents

Bearing device for wheel Download PDF

Info

Publication number
JP2013203107A
JP2013203107A JP2012071202A JP2012071202A JP2013203107A JP 2013203107 A JP2013203107 A JP 2013203107A JP 2012071202 A JP2012071202 A JP 2012071202A JP 2012071202 A JP2012071202 A JP 2012071202A JP 2013203107 A JP2013203107 A JP 2013203107A
Authority
JP
Japan
Prior art keywords
wheel
rolling
wheel mounting
mounting hole
bearing device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2012071202A
Other languages
Japanese (ja)
Inventor
Nobukatsu Uchiyama
暢克 内山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTN Corp
Original Assignee
NTN Corp
NTN Toyo Bearing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NTN Corp, NTN Toyo Bearing Co Ltd filed Critical NTN Corp
Priority to JP2012071202A priority Critical patent/JP2013203107A/en
Publication of JP2013203107A publication Critical patent/JP2013203107A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/64—Special methods of manufacture
    • 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
    • F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
    • F16C2226/50—Positive connections
    • F16C2226/60—Positive connections with threaded parts, e.g. bolt and nut connections
    • 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

Landscapes

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

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device for a wheel, for ensuring strength and durability and improving reliability of the bearing.SOLUTION: A bearing device for a wheel has wheel mounting holes 11 formed as equally spaced in a circumferential direction of a wheel mounting flange 6, to which hub bolts for fastening a wheel are fixed. A petal-like rib 10 that gives a thick portion is formed by forging on a side face 6b on an inner side of the wheel mounting flange 6; the wheel mounting holes 11 are formed in a portion of the rib 10; a female screw 11a is formed in the wheel mounting hole 11 by rolling; and a recessed portion 12 is formed in an opening on the inner side of the wheel mounting hole 11 by forging. Thereby, a bulge caused by the rolling process of the female screw 11a is accommodated in the recessed portion 12, which reliably prevents generation of a bulge on a side face 6b on the inner side of the wheel mounting flange 6.

Description

本発明は、自動車等の車輪を支持する車輪用軸受装置に関するもので、特に、車輪取付フランジの取付孔がねじ孔とされた車輪用軸受装置において、強度・耐久性を確保した車輪用軸受装置に関する。   The present invention relates to a wheel bearing device for supporting a wheel of an automobile or the like, and in particular, in a wheel bearing device in which a mounting hole of a wheel mounting flange is a screw hole, a wheel bearing device that ensures strength and durability. About.

自動車等の車輪を支持する車輪用軸受装置においては、低コスト化は言うに及ばず、燃費向上のために軽量化を追求すること、すなわち、鍛造形状を改善して余肉を排除すると共に、部品を加工する際に、その途中の切削加工等の加工工程で除去される重量（マテリアルロス）を減らすことにより、投入される材料重量を使い切ってコスト削減を図ることがなされている。一方、操縦安定性のために車輪用軸受装置を剛性アップさせることがなされている。こうした、言わば両者相反する要求を満足しつつ、各部品の強度・耐久性を向上させるための対策が種々講じられている。   In wheel bearing devices that support wheels of automobiles, etc., not to mention cost reduction, pursue weight reduction to improve fuel efficiency, that is, improve forging shape and eliminate surplus, When a part is processed, the weight (material loss) removed in a processing step such as cutting in the middle of the part is reduced, so that the cost of the material is reduced by using up the weight of the material. On the other hand, the wheel bearing device has been improved in rigidity for handling stability. Various measures have been taken to improve the strength and durability of each component while satisfying these mutually contradictory requirements.

こうした車輪用軸受装置において、ハブ輪の車輪取付フランジにタップ孔であるねじ孔を設け、このねじ孔にねじ込むハブボルトで車輪やブレーキロータを取り付けるようにしたものがある。このような車輪取付フランジにねじ孔を設けたものとして図１０に示すような車輪用軸受装置が知られている。   In such a wheel bearing device, there is a type in which a screw hole which is a tap hole is provided in a wheel mounting flange of a hub wheel, and a wheel or a brake rotor is attached with a hub bolt which is screwed into the screw hole. A wheel bearing device as shown in FIG. 10 is known as such a wheel mounting flange provided with a screw hole.

この車輪用軸受装置は、複列の転がり軸受５１と等速自在継手５２とを着脱自在にユニット化して構成されている。複列の転がり軸受５１は、車体に取り付けるための車体取付フランジ５３ｂを一体に有し、内周に複列の外側転走面５３ａ、５３ａが形成された外方部材５３と、一端部に車輪（図示せず）を取り付けるための車輪取付フランジ５５を一体に有し、外周に前記複列の外側転走面５３ａ、５３ａの一方に対向する内側転走面５４ａと、この内側転走面５４ａから軸方向に延びる円筒状の小径段部５４ｂが形成されたハブ輪５４、およびこのハブ輪５４の小径段部５４ｂに圧入され、外周に前記複列の外側転走面５３ａ、５３ａの他方に対向する内側転走面５６ａが形成された内輪５６からなる内方部材５７と、両転走面間に保持器５８を介して転動自在に収容された複列のボール５９、５９とを備えている。そして、内輪５６は、小径段部５４ｂの端部を塑性変形させて形成した加締部６０によってハブ輪５４に対して軸方向に固定されている。さらに、この加締部６０の端面にフェイススプライン６０ａが形成されている。   This wheel bearing device is configured by detachably uniting a double row rolling bearing 51 and a constant velocity universal joint 52. The double row rolling bearing 51 is integrally provided with a vehicle body mounting flange 53b for mounting to the vehicle body, an outer member 53 having double row outer rolling surfaces 53a and 53a formed on the inner periphery, and a wheel at one end. A wheel mounting flange 55 for mounting (not shown) is integrally provided, and an inner rolling surface 54a facing one of the double row outer rolling surfaces 53a and 53a on the outer periphery, and the inner rolling surface 54a. Is pressed into a hub wheel 54 formed with a cylindrical small-diameter step portion 54b extending in the axial direction from the shaft, and the small-diameter step portion 54b of the hub wheel 54. An inner member 57 composed of an inner ring 56 formed with opposed inner rolling surfaces 56a, and double rows of balls 59, 59 accommodated between both rolling surfaces via a retainer 58 so as to roll freely. ing. The inner ring 56 is fixed in the axial direction with respect to the hub ring 54 by a caulking portion 60 formed by plastically deforming an end portion of the small-diameter stepped portion 54b. Further, a face spline 60 a is formed on the end surface of the crimping portion 60.

また、外方部材５３と内方部材５７との間に形成される環状空間の開口部にはシール６１、６２が装着され、軸受内部に封入されたグリースの外部への漏洩と、外部から雨水やダスト等が軸受内部に侵入するのを防止している。   Further, seals 61 and 62 are attached to the opening portion of the annular space formed between the outer member 53 and the inner member 57, and leakage of grease sealed inside the bearing and rainwater from the outside are provided. And dust are prevented from entering the bearing.

等速自在継手５２は、外側継手部材６３と図示しない継手内輪、ケージ、およびトルク伝達ボールとを備え、外側継手部材６３は、カップ状のマウス部６４と、このマウス部６４の底部をなす肩部６５と、この肩部６５から軸方向に延びる中空状の軸部６６を一体に有し、軸部６６の内周には雌ねじ６６ａが形成されている。また、肩部６５の端面にフェイススプライン６５ａが形成されている。このフェイススプライン６５ａは、加締部６０の端面に形成されたフェイススプライン６０ａに噛合し、ドライブシャフト（図示せず）からの回転トルクが等速自在継手５２および内方部材５７を介して車輪取付フランジ５５に伝達される。   The constant velocity universal joint 52 includes an outer joint member 63 and a joint inner ring, a cage, and a torque transmission ball (not shown). The outer joint member 63 includes a cup-shaped mouth portion 64 and a shoulder that forms the bottom of the mouth portion 64. A portion 65 and a hollow shaft portion 66 extending in the axial direction from the shoulder portion 65 are integrally provided, and a female screw 66 a is formed on the inner periphery of the shaft portion 66. A face spline 65 a is formed on the end surface of the shoulder 65. The face spline 65 a meshes with the face spline 60 a formed on the end surface of the crimping portion 60, and rotational torque from a drive shaft (not shown) is attached to the wheel via the constant velocity universal joint 52 and the inner member 57. It is transmitted to the flange 55.

軸部６６の雌ねじ６６ａには締結ボルト６７が螺着され、この締結ボルト６７によって外側継手部材６３と内方部材５７の対向する両フェイススプライン６５ａ、６０ａが圧接支持され、複列の転がり軸受５１と等速自在継手５２とが着脱自在にユニット化されている。これにより、軽量・コンパクト化を図ることができると共に、分解・組立作業が簡素化される。   A fastening bolt 67 is screwed onto the female thread 66a of the shaft portion 66, and both face splines 65a, 60a of the outer joint member 63 and the inner member 57 are pressed against each other by the fastening bolt 67, and the double row rolling bearing 51 is supported. The constant velocity universal joint 52 is detachably unitized. As a result, it is possible to reduce the weight and size, and to simplify the disassembly / assembly work.

ここで、シール６２は、図１０（ｂ）に示すように、互いに対向配置された環状のシール板６８とスリンガ６９とからなる複合型のシールで構成されている。シール板６８は外方部材５３に装着される芯金７０と、この芯金７０に加硫接着により一体に接合されたシール部材７１とからなる。シール部材７１は、径方向外方に傾斜して延びるサイドリップ７１ａと、軸受外方側に傾斜して延びるラジアルリップ７１ｂとグリースリップ７１ｃを有している。   Here, as shown in FIG. 10 (b), the seal 62 is composed of a composite seal composed of an annular seal plate 68 and a slinger 69 arranged to face each other. The seal plate 68 includes a core bar 70 attached to the outer member 53 and a seal member 71 integrally joined to the core bar 70 by vulcanization adhesion. The seal member 71 includes a side lip 71a extending obliquely outward in the radial direction, a radial lip 71b extending obliquely outward of the bearing, and a grease lip 71c.

一方、スリンガ６９は、内輪５６の外径に圧入される円筒部６９ａと、この円筒部６９ａから径方向外方に延びる立板部６９ｂとを備え、シール部材７１のサイドリップ７１ａが立板部６９ｂに摺接されると共に、ラジアルリップ７１ｂが円筒部６９ａに摺接されている。スリンガ６９の円筒部６９ａは重合して形成され、円筒部６９ａの端部からさらに軸方向に延び、内輪５６の端面より突出して形成された端部脚辺６９ｃを備え、その端部に弾性リップ７２が一体に接合されている。そして、この弾性リップ７２によってフェイススプライン６５ａ、６０ａが、泥水等の異物の侵入に対して保護されている。したがって、シール６２は、複列の転がり軸受５１の内部に封入されたグリースの外部への漏洩と、外部から雨水やダスト等が軸受内部に侵入するのを防止するだけでなく、フェイススプライン６５ａ、６０ａの噛合部を密封するという付加機能も備えている（例えば、特許文献１参照。）。   On the other hand, the slinger 69 includes a cylindrical portion 69a that is press-fitted into the outer diameter of the inner ring 56, and a standing plate portion 69b that extends radially outward from the cylindrical portion 69a, and the side lip 71a of the seal member 71 is a standing plate portion. The radial lip 71b is in sliding contact with the cylindrical portion 69a. The cylindrical portion 69a of the slinger 69 is formed by superposition, and further includes an end leg side 69c that extends in the axial direction from the end portion of the cylindrical portion 69a and protrudes from the end face of the inner ring 56, and has an elastic lip at the end portion. 72 are joined together. The elastic lip 72 protects the face splines 65a and 60a against entry of foreign matter such as muddy water. Therefore, the seal 62 not only prevents leakage of the grease sealed inside the double row rolling bearing 51 to the outside and prevents rainwater, dust, etc. from entering the inside of the bearing from the outside, but also the face spline 65a, An additional function of sealing the meshing portion of 60a is also provided (see, for example, Patent Document 1).

特表２００９−５４３００９号公報Special table 2009-54309

このような従来の車輪用軸受装置では、車輪取付フランジ５５の周方向等配に下孔が形成され、この下孔にタップ加工で内面が雌ねじ７３ａとなる車輪取付孔７３が形成されている。この雌ねじ７３ａは、一般的に切削加工によって形成されている。また、車輪取付フランジ５５は鍛造加工によって形成され、雌ねじ７３ａは旋削面である車輪取付面側から加工され、雌ねじ７３ａの寸法・位置精度等を確保している。この場合、雌ねじ７３ａが切削加工のため、タップの抜け側である鍛造面側にはバリは発生しない。   In such a conventional wheel bearing device, pilot holes are formed at equal intervals in the circumferential direction of the wheel mounting flange 55, and wheel mounting holes 73 whose inner surfaces become internal threads 73 a are formed in the pilot holes by tapping. The female screw 73a is generally formed by cutting. The wheel mounting flange 55 is formed by forging, and the female screw 73a is processed from the wheel mounting surface side, which is a turning surface, to ensure the dimensions and position accuracy of the female screw 73a. In this case, since the internal thread 73a is cut, no burrs are generated on the forged surface side that is the tap removal side.

一方、雌ねじ７３ａの加工方法として転造加工が有る。転造加工は塑性加工のため、雌ねじ７３ａの加工過程で圧縮応力が発生し、ねじ山の強度が切削加工より向上する。雌ねじ７３ａを切削加工から転造加工とした場合もねじの寸法・位置精度を確保するために、旋削面である外方側（車輪側）からの加工となる。然しながら、雌ねじ７３ａを切削加工から転造加工へ変更した場合、雌ねじ７３ａの寸法・位置精度等を確保するために車輪取付面側から加工すると、転造工具の抜け側である鍛造面側に盛り上がりが発生する恐れがある。この盛り上がりは製造工程で危険性が生じるだけでなく、脱落したバリが軸受内部に混入して軸受性能に著しい欠陥をもたらす恐れがあった。   On the other hand, there is a rolling process as a method for processing the internal thread 73a. Since the rolling process is a plastic process, a compressive stress is generated in the process of the internal thread 73a, and the strength of the thread is improved compared to the cutting process. Even when the female screw 73a is changed from cutting to rolling, machining is performed from the outer side (wheel side), which is a turning surface, in order to ensure the size and position accuracy of the screw. However, when the internal thread 73a is changed from cutting to rolling, if it is processed from the wheel mounting surface side in order to ensure the dimensions, position accuracy, etc. of the internal thread 73a, it rises to the forged surface side that is the removal side of the rolling tool. May occur. This swell not only creates a danger in the manufacturing process, but also has a risk that a dropped burr is mixed into the bearing and causes a significant defect in the bearing performance.

本発明は、このような事情に鑑みてなされたもので、強度・耐久性を確保し、軸受の信頼性を向上させた車輪用軸受装置を提供することを目的としている。   The present invention has been made in view of such circumstances, and an object of the present invention is to provide a wheel bearing device that ensures strength and durability and improves the reliability of the bearing.

係る目的を達成すべく、本発明のうち請求項１に記載の発明は、外周にナックルに取り付けられるための車体取付フランジを一体に有し、内周に複列の外側転走面が一体に形成された外方部材と、一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に軸方向に延びる小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入された少なくとも一つの内輪とからなり、外周に前記複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、この内方部材と前記外方部材のそれぞれの転走面間に転動自在に収容された複列の転動体を備え、前記車輪取付フランジの周方向等配に形成された車輪取付孔に前記車輪を締結するハブボルトが固定される車輪用軸受装置において、前記車輪取付孔に転造加工によって雌ねじが形成されると共に、当該車輪取付孔のインナー側の開口部に凹部が形成されている。   In order to achieve such an object, the invention described in claim 1 of the present invention has a vehicle body mounting flange for being attached to a knuckle on the outer periphery, and a double row outer rolling surface on the inner periphery. A hub wheel integrally formed with a formed outer member and a wheel mounting flange for mounting a wheel at one end, and having a small-diameter step portion extending in the axial direction on the outer periphery, and a small-diameter step portion of the hub ring An inner member formed of at least one inner ring that is press-fitted, and formed with a double-row inner rolling surface facing the double-row outer rolling surface on the outer periphery, and the inner member and the outer member. A wheel having a double row of rolling elements accommodated in a freely rolling manner between the respective rolling surfaces, and a hub bolt for fastening the wheel to a wheel mounting hole formed in the circumferential direction of the wheel mounting flange. In the bearing device for rolling, the wheel mounting hole is formed by rolling. With internal thread is formed Te, recesses in the opening of the inner side of the wheel mounting hole is formed.

このように、ハブ輪の一端部に車輪取付フランジが一体に形成され、この車輪取付フランジの周方向等配に形成された車輪取付孔に車輪を締結するハブボルトが固定される車輪用軸受装置において、車輪取付フランジの周方向等配に形成された車輪取付孔に車輪を締結するハブボルトが固定される車輪用軸受装置において、前記車輪取付孔に転造加工によって雌ねじが形成されると共に、当該車輪取付孔のインナー側の開口部に凹部が形成されているので、雌ねじの転造加工によって発生した盛り上がりが凹部内に収容され、車輪取付フランジのインナー側の側面に盛り上がりが生じるのを確実に防止することができ、雌ねじの強度・耐久性を確保し、軸受の信頼性を向上させた車輪用軸受装置を提供することができる。   In this manner, in the wheel bearing device in which the wheel mounting flange is integrally formed at one end of the hub wheel, and the hub bolt that fastens the wheel is fixed to the wheel mounting hole formed in the circumferential direction of the wheel mounting flange. In a wheel bearing device in which a hub bolt for fastening a wheel is fixed to a wheel mounting hole formed in a circumferential direction of the wheel mounting flange, a female screw is formed in the wheel mounting hole by rolling, and the wheel Since the recess is formed in the opening on the inner side of the mounting hole, the bulge generated by the rolling process of the internal thread is accommodated in the recess, and the bulge on the inner side of the wheel mounting flange is reliably prevented. Thus, it is possible to provide a wheel bearing device that ensures the strength and durability of the female screw and improves the reliability of the bearing.

好ましくは、請求項２に記載の発明のように、前記車輪取付フランジのインナー側の側面に厚肉部となる花弁状のリブが鍛造加工によって形成され、このリブの部位に前記車輪取付孔が形成されていれば、ハブ輪の軽量・コンパクト化を達成することができると共に、ハブボルトの固定力を充分に確保しつつ、大きなモーメント荷重がこの車輪取付フランジに負荷されても強度・剛性を確保することができる。   Preferably, as in the invention described in claim 2, petal-like ribs that are thick portions are formed on the side surface on the inner side of the wheel mounting flange by forging, and the wheel mounting holes are formed in the rib portions. If it is formed, the hub wheel can be made lighter and more compact, and the hub bolts can be secured sufficiently, while ensuring sufficient strength and rigidity even when a large moment load is applied to the wheel mounting flange. can do.

また、請求項３に記載の発明のように、前記凹部が鍛造加工によって形成されていれば、加工工数の削減を図ることができる。   Moreover, if the said recessed part is formed by the forging process like invention of Claim 3, the reduction of a process man-hour can be aimed at.

また、請求項４に記載の発明のように、前記凹部が前記車輪取付フランジの外径側に開放して形成されていれば、この凹部によって軽量化を図ると共に、鍛造加工時の素材の充足不足を防止することができる。   Moreover, if the said recessed part is open | released and formed in the outer-diameter side of the said wheel mounting flange like invention of Claim 4, while aiming at weight reduction by this recessed part, the satisfaction of the raw material at the time of a forging process Insufficiency can be prevented.

また、請求項５に記載の発明のように、前記凹部が、前記雌ねじが形成される前に、前記車輪取付孔と同心状に切削加工によって円形に形成されていれば、雌ねじの転造加工によって開口部に盛り上がった部分を除去し、車輪取付フランジのインナー側の側面に盛り上がりが生じるのを確実に防止することができる。   Further, as in the invention described in claim 5, if the concave portion is formed in a circular shape by cutting concentrically with the wheel mounting hole before the female screw is formed, the female screw is rolled. Thus, the raised portion of the opening can be removed, and the rising of the side surface on the inner side of the wheel mounting flange can be reliably prevented.

また、請求項６に記載の発明のように、前記車輪取付孔の内面の組織が、微細フェライト・パーライト組織、上部ベイナイト組織、下部ベイナイト組織、焼戻マルテンサイト組織のうちのいずれか、もしくは少なくともこれらの組織のうちの２種類以上の混合組織とされていれば、標準組織からなる母材部分に比べて組織が微細となると共に、硬度が同等以上のものとなり、雌ねじである車輪取付孔における強度、疲れ強さが向上し、自動車の旋回時等の高応力が繰り返し発生する時に、車輪取付用フランジの車輪取付孔に亀裂が発生することが抑えられる。また、非標準組織による硬度アップにより、大荷重時の車輪取付孔の損傷が抑えられて、より高荷重まで耐えることができる。さらに車輪取付孔の雌ねじの摩耗が減少し、ハブボルトの軸力の低下・緩みを抑制することができる。   Further, as in the invention described in claim 6, the structure of the inner surface of the wheel mounting hole is any one of a fine ferrite / pearlite structure, an upper bainite structure, a lower bainite structure, a tempered martensite structure, or at least If two or more kinds of these structures are mixed, the structure becomes finer than the base material portion made of the standard structure, and the hardness is equal to or greater than that in the wheel mounting hole that is a female screw. Strength and fatigue strength are improved, and cracks are suppressed from occurring in the wheel mounting hole of the wheel mounting flange when high stress is repeatedly generated during turning of the automobile. Further, due to the increased hardness due to the non-standard structure, damage to the wheel mounting hole at the time of a heavy load is suppressed, and a higher load can be endured. Furthermore, the wear of the female screw of the wheel mounting hole is reduced, and the reduction and loosening of the axial force of the hub bolt can be suppressed.

また、請求項７に記載の発明のように、前記外方部材の車体取付フランジが円周方向に不連続に形成され、その突出する複数個の部位に車体取付孔が形成されると共に、この車体取付孔に転造加工によって雌ねじが形成され、当該車体取付孔のアウター側の開口部に凹部が形成されていれば、雌ねじの転造加工によって発生した盛り上がりがこの凹部内に収容され、車体取付フランジのアウター側の側面に盛り上がりが生じるのを確実に防止することができ、雌ねじの強度・耐久性を確保し、軸受の信頼性を向上させた車輪用軸受装置を提供することができる。   Further, as in the invention described in claim 7, the vehicle body mounting flange of the outer member is formed discontinuously in the circumferential direction, and a vehicle body mounting hole is formed in a plurality of protruding portions, and this If a female thread is formed in the vehicle body mounting hole by rolling, and a recess is formed in the opening on the outer side of the vehicle body mounting hole, the bulge generated by the rolling process of the female screw is accommodated in this concave portion. It is possible to provide a wheel bearing device that can reliably prevent swell from occurring on the outer side surface of the mounting flange, ensure the strength and durability of the female screw, and improve the reliability of the bearing.

本発明に係る車輪用軸受装置は、外周にナックルに取り付けられるための車体取付フランジを一体に有し、内周に複列の外側転走面が一体に形成された外方部材と、一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に軸方向に延びる小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入された少なくとも一つの内輪とからなり、外周に前記複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、この内方部材と前記外方部材のそれぞれの転走面間に転動自在に収容された複列の転動体を備え、前記車輪取付フランジの周方向等配に形成された車輪取付孔に前記車輪を締結するハブボルトが固定される車輪用軸受装置において、前記車輪取付孔に転造加工によって雌ねじが形成されると共に、当該車輪取付孔のインナー側の開口部に凹部が形成されているので、雌ねじの転造加工によって発生した盛り上がりが凹部内に収容され、車輪取付フランジのインナー側の側面に盛り上がりが生じるのを確実に防止することができ、雌ねじの強度・耐久性を確保し、軸受の信頼性を向上させた車輪用軸受装置を提供することができる。   The wheel bearing device according to the present invention has an outer member integrally formed with a vehicle body mounting flange to be attached to a knuckle on the outer periphery, and an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and one end portion And a hub ring integrally having a wheel mounting flange for mounting a wheel on the outer periphery, and having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small-diameter step portion of the hub ring. An inner member having a double-row inner rolling surface facing the double-row outer rolling surface on the outer periphery, and is freely rollable between the respective rolling surfaces of the inner member and the outer member. In a wheel bearing device in which a hub bolt for fastening the wheel is fixed to a wheel mounting hole formed in a circumferentially equidistant manner of the wheel mounting flange. A female thread is formed by rolling. Since the recess is formed in the opening on the inner side of the wheel mounting hole, it is ensured that the swell generated by the rolling process of the female thread is accommodated in the recess and the swell is generated on the side surface on the inner side of the wheel mounting flange. Therefore, it is possible to provide a wheel bearing device in which the strength and durability of the female screw are ensured and the reliability of the bearing is improved.

本発明に係る車輪用軸受装置の第１の実施形態を示す縦断面図である。It is a longitudinal section showing a 1st embodiment of a bearing device for wheels concerning the present invention. 図１の正面図である。It is a front view of FIG. （ａ）〜（ｄ）は、本発明に係るハブ輪の雌ねじの加工工程を示す説明図である。(A)-(d) is explanatory drawing which shows the manufacturing process of the internal thread of the hub ring which concerns on this invention. 本発明に係る車輪用軸受装置の第２の実施形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. 図４の正面図である。FIG. 5 is a front view of FIG. 4. （ａ）は、本発明に係る車輪用軸受装置の第３の実施形態を示す縦断面図、（ｂ）は、（ａ）の要部拡大図である。(A) is a longitudinal cross-sectional view which shows 3rd Embodiment of the wheel bearing apparatus which concerns on this invention, (b) is a principal part enlarged view of (a). 図６（ａ）の正面図である。FIG. 7 is a front view of FIG. 本発明に係る車輪用軸受装置の第４の実施形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows 4th Embodiment of the wheel bearing apparatus which concerns on this invention. 図８の正面図である。It is a front view of FIG. 従来の車輪用軸受装置を示す縦断面図である。It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus.

外周にナックルに取り付けられるための車体取付フランジを一体に有し、内周に複列の外側転走面が一体に形成された外方部材と、一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に前記複列の外側転走面に対向する一方の内側転走面と、この内側転走面から軸方向に延びる円筒状の小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入され、外周に前記複列の外側転走面に対向する他方の内側転走面が形成された内輪からなる内方部材と、この内方部材と前記外方部材の両転走面間に転動自在に収容された複列の転動体を備え、前記車輪取付フランジの周方向等配に形成される車輪取付孔に前記車輪を締結するハブボルトが固定される車輪用軸受装置において、前記車輪取付フランジのインナー側の側面に厚肉部となる花弁状のリブが鍛造加工によって形成され、このリブの部位に前記車輪取付孔が形成されると共に、この車輪取付孔に転造加工によって雌ねじが形成され、当該車輪取付孔のインナー側の開口部に凹部が鍛造加工によって形成されている。   A vehicle body mounting flange to be attached to the knuckle on the outer periphery, an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel mounting flange to mount a wheel on one end A hub wheel formed integrally with one inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and a cylindrical small diameter step portion extending in an axial direction from the inner rolling surface; and An inner member comprising an inner ring press-fitted into a small-diameter step portion of the hub wheel and having the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and the inner member and the outer member A hub bolt for fastening the wheel is fixed to a wheel mounting hole formed in a circumferentially equidistant manner of the wheel mounting flange. In the wheel bearing device, the inner side surface of the wheel mounting flange A petal-like rib that becomes a thick part is formed by forging, and the wheel mounting hole is formed in a portion of the rib, and a female screw is formed by rolling in the wheel mounting hole. A recess is formed in the opening on the inner side by forging.

以下、本発明の実施の形態を図面に基づいて詳細に説明する。
図１は、本発明に係る車輪用軸受装置の第１の実施形態を示す縦断面図、図２は、図１の正面図、図３（ａ）〜（ｄ）は、本発明に係るハブ輪の雌ねじの加工工程を示す説明図である。なお、以下の説明では、車両に組み付けた状態で、車両の外側寄りとなる側をアウター側（図１の左側）、中央寄り側をインナー側（図１の右側）という。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device according to the present invention, FIG. 2 is a front view of FIG. 1, and FIGS. 3A to 3D are hubs according to the present invention. It is explanatory drawing which shows the manufacturing process of the internal thread of a ring | wheel. In the following description, the side closer to the outer side of the vehicle is referred to as the outer side (left side in FIG. 1) and the side closer to the center is referred to as the inner side (right side in FIG. 1).

この車輪用軸受装置は、内方部材１と外方部材２と複列の転動体（ボール）３、３とを備え、従動輪側の第３世代と称される構成をなしている。内方部材１はハブ輪４と別体の内輪５とからなる。ハブ輪４は、アウター側の端部に車輪（図示せず）を取り付けるための車輪取付フランジ６を一体に有し、外周に一方（アウター側）の内側転走面４ａと、この内側転走面４ａから軸方向に延びる円筒状の小径段部４ｂが形成されている。   This wheel bearing device includes an inner member 1, an outer member 2, and double-row rolling elements (balls) 3, 3, and is configured as a third generation on the driven wheel side. The inner member 1 includes a hub ring 4 and a separate inner ring 5. The hub wheel 4 integrally has a wheel mounting flange 6 for mounting a wheel (not shown) at an end portion on the outer side, and has one (outer side) inner rolling surface 4a on the outer periphery and the inner rolling surface. A cylindrical small diameter step portion 4b extending in the axial direction from the surface 4a is formed.

一方、内輪５は、外周に他方（インナー側）の内側転走面５ａが形成され、ハブ輪４の小径段部４ｂに所定のシメシロを介して圧入されている。そして、この小径段部４ｂの端部を径方向外方に塑性変形（揺動加締）させて形成した加締部４ｃによって所定の軸受予圧が付与された状態で軸方向に固定されている。   On the other hand, the inner ring 5 is formed with the other (inner side) inner rolling surface 5a on the outer periphery, and is press-fitted into the small-diameter step portion 4b of the hub ring 4 through a predetermined squeeze. The end portion of the small diameter step portion 4b is fixed in the axial direction in a state where a predetermined bearing preload is applied by a caulking portion 4c formed by plastic deformation (oscillation caulking) radially outward. .

外方部材２は、外周に車体（図示せず）に取り付けられるための車体取付フランジ２ｂを一体に有し、内周に前記内方部材１の内側転走面４ａ、５ａに対向する複列の外側転走面２ａ、２ａが一体に形成されている。そして、これら両転走面２ａ、４ａおよび２ａ、５ａ間には保持器７、７で円周等配された複列の転動体３、３がそれぞれ転動自在に収容されている。なお、内方部材１と外方部材２と間に形成される環状空間の開口部にはシール８、９が装着され、軸受内部に封入された潤滑グリースの漏洩と、外部から雨水やダスト等が軸受内部に侵入するのを防止している。   The outer member 2 integrally has a vehicle body mounting flange 2b for mounting to a vehicle body (not shown) on the outer periphery, and a double row facing the inner rolling surfaces 4a and 5a of the inner member 1 on the inner periphery. The outer rolling surfaces 2a and 2a are integrally formed. And between these both rolling surfaces 2a, 4a and 2a, 5a, the double row rolling elements 3 and 3 equally distributed by the holder | retainers 7 and 7 are each accommodated so that rolling is possible. Seals 8 and 9 are attached to the opening of the annular space formed between the inner member 1 and the outer member 2, leakage of lubricating grease sealed inside the bearing, rainwater, dust, etc. from the outside Is prevented from entering the inside of the bearing.

ハブ輪４はＳ５３Ｃ等の炭素０．４０〜０．８０重量％を含む中高炭素鋼で形成され、内側転走面４ａをはじめ、アウター側のシール８が摺接するフランジ基部６ａから小径段部４ｂに亙り高周波焼入れによって表面硬さを５８〜６４ＨＲＣの範囲に硬化処理が施されている。なお、加締部４ｃは鍛造後の生のままとされている。こうした高周波焼入れによりハブ輪４の強度が向上し、内輪５の嵌合面におけるフレッティング摩耗が防止されて耐久性が向上すると共に、塑性変形が容易にでき、揺動加締時にクラックが発生するのを防止することができる。   The hub wheel 4 is made of medium and high carbon steel containing 0.40 to 0.80% by weight of carbon such as S53C, and the small diameter step portion 4b from the flange base portion 6a to which the outer side seal 8 is slidably in contact with the inner rolling surface 4a. On the other hand, the surface is hardened in a range of 58 to 64 HRC by induction hardening. The caulking portion 4c is left as it is after forging. Such induction hardening improves the strength of the hub wheel 4, prevents fretting wear on the fitting surface of the inner ring 5, improves durability, facilitates plastic deformation, and generates cracks during swing caulking. Can be prevented.

一方、内輪５および転動体３はＳＵＪ２等の高炭素クロム軸受鋼からなり、ズブ焼入れにより芯部まで５８〜６４ＨＲＣの範囲で硬化処理されている。また、外方部材２は、ハブ輪４と同様、Ｓ５３Ｃ等の炭素０．４０〜０．８０重量％を含む中高炭素鋼で形成され、複列の外側転走面２ａ、２ａが高周波焼入れによって表面硬さを５８〜６４ＨＲＣの範囲に硬化処理されている。なお、ここでは、転動体３にボールを用いた複列アンギュラ玉軸受を例示したが、これに限らず、転動体３に円錐ころを用いた複列円錐ころ軸受であっても良い。また、例示した第３世代構造に限らず、第２世代あるいは第４世代構造であっても良い。   On the other hand, the inner ring 5 and the rolling element 3 are made of high carbon chrome bearing steel such as SUJ2, and are hardened in the range of 58 to 64 HRC to the core part by quenching. Further, the outer member 2 is formed of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, like the hub wheel 4, and the double row outer rolling surfaces 2a and 2a are formed by induction hardening. The surface hardness is set in the range of 58 to 64 HRC. In addition, although the double row angular contact ball bearing which used the ball for the rolling element 3 was illustrated here, it is not restricted to this, The double row tapered roller bearing which used the tapered roller for the rolling element 3 may be sufficient. Further, the structure is not limited to the illustrated third generation structure, and may be a second generation or fourth generation structure.

本実施形態では、ハブ輪４が熱間鍛造により形成され、旋盤等の切削加工により所定の形状・寸法に形成された後、所定の部位が高周波焼入れにより熱処理され、その後研削加工されている。ここで、図３を用いて、ハブ輪４の雌ねじの加工方法を説明する。まず、（ａ）に示すように、車輪取付フランジ６のインナー側の側面６ｂに、円周等配位置に厚肉部となる花弁状のリブ１０が鍛造工程によって形成される。これにより、ハブ輪４の軽量・コンパクト化を達成することができると共に、ハブボルトの固定力を充分に確保しつつ、大きなモーメント荷重がこの車輪取付フランジ６に負荷されても強度・剛性を確保することができる。また、この時同時に凹部１２が形成される。   In the present embodiment, the hub wheel 4 is formed by hot forging, and after being formed into a predetermined shape and size by cutting such as a lathe, a predetermined portion is heat-treated by induction hardening and then subjected to grinding. Here, the processing method of the internal thread of the hub wheel 4 is demonstrated using FIG. First, as shown to (a), the petal-like rib 10 used as a thick part in the circumferentially equidistant position is formed in the side surface 6b of the inner side of the wheel attachment flange 6 by a forge process. As a result, the hub wheel 4 can be reduced in weight and size, and sufficient strength and rigidity can be ensured even when a large moment load is applied to the wheel mounting flange 6 while sufficiently securing the hub bolt. be able to. At the same time, the recess 12 is formed.

次に、車輪取付フランジ６のアウター側の側面６ｃ、インナー側の側面６ｂ、内径側の順に旋削加工が施される。そして、（ｂ）に示すように、このリブ１０の部位に、ドリル加工によって下孔が形成され、この下孔に内面が雌ねじ１１ａとなる車輪取付孔１１が形成される。その後、（ｃ）に示すように、車輪取付孔１１のアウター側の開口部に面取り加工が施される。最後に、（ｄ）に示すように、車輪取付孔１１のアウター側から転造工具（転造タップ）Ｔを回転させた状態で挿入され、この転造工具Ｔによって雌ねじ１１ａが形成される。この場合、雌ねじ１１ａの先端部は、割れ込み１１ｂを持った転造ねじ特有の形状に形成される。本実施形態では、車輪取付フランジ６のアウター側の側面６ｃに、図示しないブレーキロータを介して車輪が重ねられ、各車輪取付孔１１にアウター側からハブボルト（図示せず）が螺着されて車輪が固定される。   Next, turning is performed in the order of the outer side surface 6c, the inner side surface 6b, and the inner diameter side of the wheel mounting flange 6. And as shown in (b), a pilot hole is formed in the site | part of this rib 10 by drilling, and the wheel attachment hole 11 by which the inner surface becomes the internal thread 11a is formed in this pilot hole. Then, as shown in (c), chamfering is performed on the outer opening of the wheel mounting hole 11. Finally, as shown in (d), the rolling tool (rolling tap) T is inserted from the outer side of the wheel mounting hole 11 in a rotated state, and the rolling tool T forms a female screw 11a. In this case, the tip of the female screw 11a is formed in a shape unique to a rolled screw having a crack 11b. In this embodiment, a wheel is overlapped on the outer side surface 6c of the wheel mounting flange 6 via a brake rotor (not shown), and a hub bolt (not shown) is screwed into each wheel mounting hole 11 from the outer side. Is fixed.

このように、雌ねじ１１ａを転造加工によって形成することにより、加工過程で圧縮残留応力が表面に発生し、ねじ山の強度が切削加工で形成されたものより向上する。また、雌ねじ１１ａを転造加工によって形成した場合、車輪取付フランジ６のインナー側の側面６ｂに盛り上がりが生じないよう、本実施形態では、車輪取付孔１１のインナー側の開口部に凹部１２が鍛造加工によって形成されている。   Thus, by forming the internal thread 11a by rolling, compressive residual stress is generated on the surface during the processing, and the strength of the thread is improved as compared with that formed by cutting. Further, in the present embodiment, when the female screw 11a is formed by rolling, the recess 12 is forged in the inner side opening of the wheel mounting hole 11 so that the inner side surface 6b of the wheel mounting flange 6 does not rise. It is formed by processing.

本実施形態では、車輪取付孔１１に転造加工によって雌ねじ１１ａが形成され、この雌ねじ１１ａにハブボルトが螺着されて車輪が固定されるため、雌ねじ１１ａの転造加工によって発生した盛り上がりがこの凹部１２内に収容され、車輪取付フランジ６のインナー側の側面６ｂに盛り上がりが生じるのを確実に防止することができ、雌ねじ１１ａの強度・耐久性を確保し、軸受の信頼性を向上させた車輪用軸受装置を提供することができる。   In the present embodiment, a female screw 11a is formed in the wheel mounting hole 11 by rolling, and a hub bolt is screwed to the female screw 11a to fix the wheel, so that the bulge generated by the rolling process of the female screw 11a is the recess. 12 that can be reliably prevented from being raised on the inner side surface 6b of the wheel mounting flange 6, the strength and durability of the female screw 11a are secured, and the reliability of the bearing is improved. A bearing device can be provided.

また、本実施形態では、さらに、外方部材２の車体取付フランジ２ｂは円周方向に不連続に形成され、その突出する複数個（ここでは４個）の部位にドリル加工によって下孔が形成され、この下孔に転造加工で内面が雌ねじ１３ａとなる車体取付孔１３が形成されている。そして、この車体取付孔１３のアウター側の開口部に凹部１４が鍛造加工によって形成されている。これにより、雌ねじ１３ａの転造加工によって発生した盛り上がりがこの凹部１４内に収容され、車体取付フランジ２ｂのアウター側の側面１５に盛り上がりが生じるのを確実に防止することができ、雌ねじの強度・耐久性を確保し、軸受の信頼性を向上させた車輪用軸受装置を提供することができる。なお、本実施形態では雌ねじ１３ａの転造加工によって加工したが、雌ねじ１３ａを切削によって形成しても良い。   Further, in the present embodiment, the vehicle body mounting flange 2b of the outer member 2 is formed discontinuously in the circumferential direction, and a pilot hole is formed by drilling in a plurality of protruding portions (here, four). A vehicle body mounting hole 13 whose inner surface becomes an internal thread 13a is formed in the lower hole by rolling. And the recessed part 14 is formed in the opening part of the outer side of this vehicle body attachment hole 13 by forge processing. As a result, the bulge generated by the rolling process of the female screw 13a is accommodated in the recess 14, and it is possible to reliably prevent the bulge from occurring on the outer side surface 15 of the vehicle body mounting flange 2b. It is possible to provide a wheel bearing device that ensures durability and improves the reliability of the bearing. In this embodiment, the internal thread 13a is processed by rolling, but the internal thread 13a may be formed by cutting.

図４は、本発明に係る車輪用軸受装置の第２の実施形態を示す縦断面図、図５は、図４の正面図である。なお、この実施形態は、前述した第１の実施形態（図１）と基本的にはハブ輪の構成が異なるだけで、その他前述した実施形態と同一部品、同一部位あるいは同一機能を有する部品や部位には同じ符号を付して詳細な説明を省略する。   4 is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention, and FIG. 5 is a front view of FIG. This embodiment basically differs from the first embodiment described above (FIG. 1) only in the configuration of the hub wheel, and other parts having the same parts, the same parts, or the same functions as the above-described embodiments. Parts are denoted by the same reference numerals and detailed description thereof is omitted.

この車輪用軸受装置は、内方部材１６と外方部材２と複列の転動体３、３とを備えている。内方部材１６はハブ輪１７と別体の内輪５とからなる。ハブ輪１７は、アウター側の端部に車輪取付フランジ６を一体に有し、外周に一方の内側転走面４ａと、この内側転走面４ａから軸方向に延びる円筒状の小径段部４ｂが形成されている。   The wheel bearing device includes an inner member 16, an outer member 2, and double-row rolling elements 3 and 3. The inner member 16 includes a hub ring 17 and a separate inner ring 5. The hub wheel 17 integrally has a wheel mounting flange 6 at an end on the outer side, one inner rolling surface 4a on the outer periphery, and a cylindrical small-diameter step portion 4b extending in the axial direction from the inner rolling surface 4a. Is formed.

ハブ輪１７はＳ５３Ｃ等の炭素０．４０〜０．８０重量％を含む中高炭素鋼で形成され、内側転走面４ａをはじめ、アウター側のシール９が摺接する基部６ａから小径段部４ｂに亙り高周波焼入れによって表面硬さを５８〜６４ＨＲＣの範囲に硬化処理が施されている。   The hub wheel 17 is formed of medium and high carbon steel containing 0.40 to 0.80% by weight of carbon such as S53C, and the inner raceway surface 4a and the base portion 6a with which the outer seal 9 is slidably contacted to the small diameter step portion 4b. The surface hardness is set in the range of 58 to 64 HRC by induction induction hardening.

本実施形態では、車輪取付フランジ６のインナー側の側面６ｂに、円周等配位置に厚肉部となる花弁状のリブ１０が鍛造工程によって形成されると共に、このリブ１０の部位に、ドリル加工によって下孔が形成され、この下孔に転造工具によって内面が雌ねじ１１ａとなる車輪取付孔１１が形成されている。ここで、この車輪取付孔１１のインナー側の開口部に凹部１８が予め鍛造加工によって形成されている。なお、凹部１８の鍛造加工は、リブ１０を形成する金型と同一の金型によって行われる。これにより、凹部１８の同心度を確保し、凹部１８と車輪取付孔１１がずれるのを防止することができる。   In the present embodiment, a petal-like rib 10 that is a thick wall portion is formed on the inner side surface 6b of the wheel mounting flange 6 at a circumferentially equidistant position by a forging process. A pilot hole is formed by processing, and a wheel mounting hole 11 whose inner surface becomes a female screw 11a is formed in the pilot hole by a rolling tool. Here, a recess 18 is formed in advance in the opening on the inner side of the wheel mounting hole 11 by forging. In addition, the forging process of the recessed part 18 is performed with the metal mold | die same as the metal mold | die which forms the rib 10. FIG. Thereby, the concentricity of the recessed part 18 can be ensured and it can prevent that the recessed part 18 and the wheel attachment hole 11 slip | deviate.

この凹部１８は、図５に示すように、車輪取付フランジ６の外径側に開放して形成されている。このように、この凹部１８によって雌ねじ１１ａを転造加工によって形成した時に発生する盛り上がりを収容し、車輪取付フランジ６のインナー側の側面６ｂに盛り上がりが生じるのを確実に防止することができると共に、鍛造加工時の素材の充足不足を防止することができる。   As shown in FIG. 5, the recess 18 is formed open to the outer diameter side of the wheel mounting flange 6. As described above, the recess 18 accommodates the swell generated when the female screw 11a is formed by rolling, and can reliably prevent the swell from occurring on the side surface 6b on the inner side of the wheel mounting flange 6. Insufficiency of material during forging can be prevented.

図６（ａ）は、本発明に係る車輪用軸受装置の第３の実施形態を示す縦断面図、（ｂ）は、（ａ）の要部拡大図、図７は、図６（ａ）の正面図である。なお、この実施形態は、前述した第１の実施形態（図１）と基本的にはハブ輪の構成が異なるだけで、その他前述した実施形態と同一部品、同一部位あるいは同一機能を有する部品や部位には同じ符号を付して詳細な説明を省略する。   6 (a) is a longitudinal sectional view showing a third embodiment of the wheel bearing device according to the present invention, FIG. 6 (b) is an enlarged view of a main part of FIG. 6 (a), and FIG. FIG. This embodiment basically differs from the first embodiment described above (FIG. 1) only in the configuration of the hub wheel, and other parts having the same parts, the same parts, or the same functions as the above-described embodiments. Parts are denoted by the same reference numerals and detailed description thereof is omitted.

この車輪用軸受装置は、図６（ａ）に示すように、内方部材１９と外方部材２と複列の転動体３、３とを備えている。内方部材１９はハブ輪２０と別体の内輪５とからなる。ハブ輪２０は、アウター側の端部に車輪取付フランジ６を一体に有し、外周に一方の内側転走面４ａと、この内側転走面４ａから軸方向に延びる円筒状の小径段部４ｂが形成されている。   As shown in FIG. 6A, the wheel bearing device includes an inner member 19, an outer member 2, and double-row rolling elements 3 and 3. The inner member 19 includes a hub ring 20 and a separate inner ring 5. The hub wheel 20 integrally has a wheel mounting flange 6 at an end portion on the outer side, one inner rolling surface 4a on the outer periphery, and a cylindrical small-diameter step portion 4b extending in the axial direction from the inner rolling surface 4a. Is formed.

ハブ輪２０はＳ５３Ｃ等の炭素０．４０〜０．８０重量％を含む中高炭素鋼で形成され、内側転走面４ａをはじめ、アウター側のシール９が摺接する基部６ａから小径段部４ｂに亙り高周波焼入れによって表面硬さを５８〜６４ＨＲＣの範囲に硬化処理が施されている。   The hub wheel 20 is formed of medium and high carbon steel containing 0.40 to 0.80% by weight of carbon such as S53C, and the inner rolling surface 4a and the base portion 6a with which the outer seal 9 is slidably contacted to the small diameter step portion 4b. The surface hardness is set in the range of 58 to 64 HRC by induction induction hardening.

本実施形態では、車輪取付フランジ６のインナー側の側面６ｂに、円周等配位置に厚肉部となる花弁状のリブ１０が鍛造工程によって形成されると共に、このリブ１０の部位に、ドリル加工によって下孔が形成され、この下孔に転造工具によって内面が雌ねじ１１ａとなる車輪取付孔１１が形成されている。そして、この車輪取付孔１１のインナー側の開口部に車輪取付孔１１と同心状に円形の凹部２１が切削加工によって形成され（図７参照）、雌ねじ１１ａが転造加工によって形成されている。これにより、凹部２１が雌ねじ１１ａの転造加工によって開口部に盛り上がった部分を許容し、車輪取付フランジ６のインナー側の側面６ｂに盛り上がりが生じるのを確実に防止することができる。   In the present embodiment, a petal-like rib 10 that is a thick wall portion is formed on the inner side surface 6b of the wheel mounting flange 6 at a circumferentially equidistant position by a forging process. A pilot hole is formed by processing, and a wheel mounting hole 11 whose inner surface becomes a female screw 11a is formed in the pilot hole by a rolling tool. And the circular recessed part 21 concentric with the wheel attachment hole 11 is formed in the opening part of the inner side of this wheel attachment hole 11 by cutting (refer FIG. 7), and the internal thread 11a is formed by rolling. Thereby, the recessed part 21 accept | permits the part which raised to the opening part by the rolling process of the internal thread 11a, and can prevent reliably that the rising arises in the side surface 6b of the inner side of the wheel mounting flange 6. FIG.

図８は、本発明に係る車輪用軸受装置の第４の実施形態を示す縦断面図、図９は、図８の正面図である。なお、この実施形態は、前述した第１の実施形態（図１）と基本的にはハブ輪と外方部材の構成が異なるだけで、その他前述した実施形態と同一部品、同一部位あるいは同一機能を有する部品や部位には同じ符号を付して詳細な説明を省略する。   FIG. 8 is a longitudinal sectional view showing a fourth embodiment of the wheel bearing device according to the present invention, and FIG. 9 is a front view of FIG. This embodiment is basically the same as the first embodiment (FIG. 1) described above except for the configuration of the hub wheel and the outer member, and the same parts, the same parts, or the same functions as the other embodiments described above. The parts and parts having the same reference numerals are given the same reference numerals, and detailed description thereof is omitted.

この車輪用軸受装置は、図８に示すように、内方部材２２と外方部材２と複列の転動体３、３とを備えている。内方部材２２はハブ輪２３と別体の内輪５とからなる。ハブ輪２３は、アウター側の端部に車輪取付フランジ６を一体に有し、外周に一方の内側転走面４ａと、この内側転走面４ａから軸方向に延びる円筒状の小径段部４ｂが形成されている。   As shown in FIG. 8, the wheel bearing device includes an inner member 22, an outer member 2, and double-row rolling elements 3 and 3. The inner member 22 includes a hub ring 23 and a separate inner ring 5. The hub wheel 23 integrally has a wheel mounting flange 6 at an end portion on the outer side, one inner rolling surface 4a on the outer periphery, and a cylindrical small-diameter step portion 4b extending in the axial direction from the inner rolling surface 4a. Is formed.

ハブ輪２３はＳ５３Ｃ等の炭素０．４０〜０．８０重量％を含む中高炭素鋼で形成され、内側転走面４ａをはじめ、アウター側のシール９が摺接する基部６ａから小径段部４ｂに亙り高周波焼入れによって表面硬さを５８〜６４ＨＲＣの範囲に硬化処理が施されている。   The hub wheel 23 is formed of medium and high carbon steel containing 0.40 to 0.80% by weight of carbon such as S53C, and the inner raceway surface 4a and the base portion 6a with which the outer seal 9 comes into sliding contact with the small diameter step portion 4b. The surface hardness is set in the range of 58 to 64 HRC by induction induction hardening.

本実施形態では、車輪取付フランジ６のインナー側の側面６ｂに、円周等配位置に厚肉部となる花弁状のリブ１０が鍛造工程によって形成されると共に、このリブ１０の部位に、ドリル加工によって下孔が形成され、この下孔に転造工具によって内面が雌ねじ１１ａとなる車輪取付孔１１が形成されている。そして、この車輪取付孔１１のインナー側の開口部に車輪取付孔１１と同心状に円形の凹部２４が切削加工によって形成され（図９参照）、雌ねじ１１ａが転造加工によって形成されている。これにより、凹部２４が雌ねじ１１ａの転造加工によって開口部に盛り上がった部分を許容し、車輪取付フランジ６のインナー側の側面６ｂに盛り上がりが生じるのを確実に防止することができる。   In the present embodiment, a petal-like rib 10 that is a thick wall portion is formed on the inner side surface 6b of the wheel mounting flange 6 at a circumferentially equidistant position by a forging process. A pilot hole is formed by processing, and a wheel mounting hole 11 whose inner surface becomes a female screw 11a is formed in the pilot hole by a rolling tool. And the circular recessed part 24 concentric with the wheel attachment hole 11 is formed in the opening part of the inner side of this wheel attachment hole 11 by cutting (refer FIG. 9), and the internal thread 11a is formed by rolling. Thereby, the recessed part 24 accept | permits the part which raised to the opening part by the rolling process of the internal thread 11a, and can prevent reliably that the rising arises in the side surface 6b of the inner side of the wheel mounting flange 6. FIG.

また、本実施形態では、ハブ輪２３の母材部分は標準組織であるが、車輪取付フランジ６の車輪取付孔１１の内面が非標準組織の部分とされている。非標準組織は、熱間鍛造工程の途中または最後に、冷媒を浴びせることで、ハブ輪２３を局部的に冷却すること等で得た組織であり、例えば、微細フェライト・パーライト組織、上部ベイナイト組織、下部ベイナイト組織、焼戻マルテンサイト組織のうちのいずれか、もしくは少なくともこれらの組織のうちの２種類以上の混合組織とされる。これらは冷却方法によって選択することができる。   Moreover, in this embodiment, although the base material part of the hub ring 23 is a standard structure, the inner surface of the wheel mounting hole 11 of the wheel mounting flange 6 is a non-standard structure part. The non-standard structure is a structure obtained by locally cooling the hub wheel 23 by being exposed to a refrigerant during or at the end of the hot forging process, for example, a fine ferrite / pearlite structure, an upper bainite structure. , A lower bainite structure, a tempered martensite structure, or a mixed structure of at least two of these structures. These can be selected depending on the cooling method.

冷媒は、液体、そのミストや気体、例えば、油、または低温エアー等が用いられる。また、冷媒には、用途に応じて、潤滑剤、メディア、防錆剤などを混入し、素材の潤滑・離型効果、金型の摩耗防止、冷却効果、鍛造後のショットブラスト等によるスケール落としの省略、防錆効果等を得るようにしても良い。   As the refrigerant, a liquid, its mist or gas, for example, oil, low temperature air or the like is used. Also, depending on the application, lubricants, media, rust preventives, etc. may be mixed in the refrigerant to reduce the scale by material lubrication / mold release effect, mold wear prevention, cooling effect, shot blasting after forging, etc. The omission, the antirust effect, etc. may be obtained.

このように、雌ねじ１１ａからなる車輪取付孔１１の内面を非標準組織、すなわち、微細フェライト・パーライト組織、上部ベイナイト組織、下部ベイナイト組織、焼戻マルテンサイト組織のうちのいずれか、もしくは少なくともこれらの組織のうちの２種類以上の混合組織の非標準組織とすることにより、標準組織からなる母材部分に比べて組織が微細であり、また硬度が同等以上のものとなる。このような組織微細化や硬度アップにより、雌ねじ１１ａである車輪取付孔１１における強度、疲れ強さが向上し、自動車の旋回時等の高応力が繰り返し発生する時に、車輪取付用フランジ６の車輪取付孔１１に亀裂が発生することが抑えられる。また、非標準組織による硬度アップにより、大荷重時の車輪取付孔１１の損傷が抑えられて、より高荷重まで耐えることができる。さらに車輪取付孔１１の雌ねじ１１ａの摩耗が減少し、ハブボルトの軸力の低下・緩みを抑制することができる。   As described above, the inner surface of the wheel mounting hole 11 formed of the female screw 11a has a non-standard structure, that is, a fine ferrite / pearlite structure, an upper bainite structure, a lower bainite structure, a tempered martensite structure, or at least these. By using a non-standard structure of two or more types of mixed structures, the structure is finer and the hardness is equal to or higher than that of the base material portion made of the standard structure. With such a structure refinement and hardness increase, the strength and fatigue strength in the wheel mounting hole 11 that is the female screw 11a are improved, and the wheel of the wheel mounting flange 6 is generated when high stress is repeatedly generated during turning of the automobile. Generation of cracks in the mounting hole 11 is suppressed. Further, due to the increased hardness due to the non-standard structure, damage to the wheel mounting hole 11 under a heavy load can be suppressed, and a higher load can be endured. Furthermore, the wear of the female thread 11a of the wheel mounting hole 11 is reduced, and the reduction and loosening of the axial force of the hub bolt can be suppressed.

以上、本発明の実施の形態について説明を行ったが、本発明はこうした実施の形態に何等限定されるものではなく、あくまで例示であって、本発明の要旨を逸脱しない範囲内において、さらに種々なる形態で実施し得ることは勿論のことである。本発明の範囲は、特許請求の範囲の記載によって示され、さらに特許請求の範囲に記載の均等の意味、および範囲内のすべての変更を含む。   The embodiment of the present invention has been described above, but the present invention is not limited to such an embodiment, and is merely an example, and various modifications can be made without departing from the scope of the present invention. Of course, it can be implemented in the following form. The scope of the present invention is defined by the terms of the claims, and includes the equivalent meanings of the claims and all modifications within the scope.

本発明に係る車輪用軸受装置は、一端部にブレーキロータを介して車輪を取り付けるための車輪取付フランジを一体に有し、この車輪取付フランジにハブボルトが固定される第２世代乃至第４世代のあらゆる構造において適用が可能である。   The wheel bearing device according to the present invention is integrally provided with a wheel mounting flange for mounting a wheel at one end via a brake rotor, and a hub bolt is fixed to the wheel mounting flange. It can be applied to any structure.

１、１６、１９、２２ 内方部材
２ 外方部材
２ａ 外側転走面
２ｂ 車体取付フランジ
３ 転動体
４、１７、２０、２３ ハブ輪
４ａ、５ａ 内側転走面
４ｂ 小径段部
４ｃ 加締部
５ 内輪
６ 車輪取付フランジ
６ａ 車輪取付フランジのインナー側の基部
６ｂ 車輪取付フランジのインナー側の側面
６ｃ 車輪取付フランジのアウター側の側面
７ 保持器
８ アウター側のシール
９ インナー側のシール
１０ リブ
１１ 車輪取付孔
１１ａ、１３ａ 雌ねじ
１１ｂ 割れ込み
１２、１４、１８、２１、２４ 凹部
１３ 車体取付孔
１５ 車体取付フランジのアウター側の側面
５１ 複列の転がり軸受
５２ 等速自在継手
５３ 外方部材
５３ａ 外側転走面
５３ｂ 車体取付フランジ
５４ ハブ輪
５４ａ、５６ａ 内側転走面
５４ｂ 小径段部
５５ 車輪取付フランジ
５６ 内輪
５７ 内方部材
５８ 保持器
５９ ボール
６０ 加締部
６０ａ、６５ａ フェイススプライン
６１、６２ シール
６３ 外側継手部材
６４ マウス部
６５ 肩部
６６ 軸部
６６ａ 雌ねじ
６７ 締結ボルト
６８ シール板
６９ スリンガ
６９ａ 円筒部
６９ｂ 立板部
６９ｃ 端部脚辺
７０ 芯金
７１ シール部材
７１ａ サイドリップ
７１ｂ ラジアルリップ
７１ｃ グリ−スリップ
７２ 弾性リップ
７３ 車輪取付孔
７３ａ 雌ねじ
Ｔ 転造工具 1, 16, 19, 22 Inner member 2 Outer member 2a Outer rolling surface 2b Car body mounting flange 3 Rolling elements 4, 17, 20, 23 Hub wheel 4a, 5a Inner rolling surface 4b Small diameter step 4c Clamping portion 5 Inner ring 6 Wheel mounting flange 6a Inner side base 6b of wheel mounting flange Inner side surface 6c of wheel mounting flange Outer side surface 7 of wheel mounting flange 7 Cage 8 Outer side seal 9 Inner side seal 10 Rib 11 Wheel Mounting holes 11a, 13a Female thread 11b Cracks 12, 14, 18, 21, 24 Recess 13 Car body mounting hole 15 Outer side surface 51 of vehicle mounting flange Double row rolling bearing 52 Constant velocity universal joint 53 Outer member 53a Outer rolling Running surface 53b Car body mounting flange 54 Hub wheels 54a, 56a Inner rolling surface 54b Small diameter step portion 55 Wheel mounting flange 56 Inner ring 57 Inside Member 58 Cage 59 Ball 60 Caulking part 60a, 65a Face spline 61, 62 Seal 63 Outer joint member 64 Mouse part 65 Shoulder part 66 Shaft part 66a Female thread 67 Fastening bolt 68 Sealing plate 69 Slinger 69a Cylindrical part 69b Standing plate part 69c End leg 70 Core metal 71 Seal member 71a Side lip 71b Radial lip 71c Grease slip 72 Elastic lip 73 Wheel mounting hole 73a Female thread T Rolling tool

Claims (7)

外周にナックルに取り付けられるための車体取付フランジを一体に有し、内周に複列の外側転走面が一体に形成された外方部材と、
一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に軸方向に延びる小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入された少なくとも一つの内輪とからなり、外周に前記複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、
この内方部材と前記外方部材のそれぞれの転走面間に転動自在に収容された複列の転動体を備え、
前記車輪取付フランジの周方向等配に形成された車輪取付孔に前記車輪を締結するハブボルトが固定される車輪用軸受装置において、
前記車輪取付孔に転造加工によって雌ねじが形成されると共に、当該車輪取付孔のインナー側の開口部に凹部が形成されていることを特徴とする車輪用軸受装置。 An outer member integrally having a vehicle body mounting flange for being attached to the knuckle on the outer periphery, and an outer rolling surface of a double row integrally formed on the inner periphery;
A hub wheel integrally having a wheel mounting flange for mounting a wheel at one end, and having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small-diameter step portion of the hub ring; An inner member in which a double row inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery,
A double row rolling element is housed in a freely rolling manner between the rolling surfaces of the inner member and the outer member,
In a wheel bearing device in which a hub bolt that fastens the wheel is fixed to a wheel mounting hole formed in a circumferentially equal distribution of the wheel mounting flange,
A wheel bearing device, wherein a female screw is formed in the wheel mounting hole by rolling, and a recess is formed in an opening on the inner side of the wheel mounting hole. 前記車輪取付フランジのインナー側の側面に厚肉部となる花弁状のリブが鍛造加工によって形成され、このリブの部位に前記車輪取付孔が形成されている請求項１に記載の車輪用軸受装置。   2. The wheel bearing device according to claim 1, wherein a petal-like rib serving as a thick portion is formed on a side surface on the inner side of the wheel mounting flange by forging, and the wheel mounting hole is formed in a portion of the rib. . 前記凹部が鍛造加工によって形成されている請求項１に記載の車輪用軸受装置。   The wheel bearing device according to claim 1, wherein the recess is formed by forging. 前記凹部が前記車輪取付フランジの外径側に開放して形成されている請求項３に記載の車輪用軸受装置。   The wheel bearing device according to claim 3, wherein the recess is formed open to an outer diameter side of the wheel mounting flange. 前記凹部が、前記雌ねじが形成される前に、前記車輪取付孔と同心状に切削加工によって円形に形成されている請求項１に記載の車輪用軸受装置。   The wheel bearing device according to claim 1, wherein the recess is formed in a circular shape by cutting so as to be concentric with the wheel mounting hole before the female screw is formed. 前記車輪取付孔の内面の組織が、微細フェライト・パーライト組織、上部ベイナイト組織、下部ベイナイト組織、焼戻マルテンサイト組織のうちのいずれか、もしくは少なくともこれらの組織のうちの２種類以上の混合組織とされている請求項１、２および５いずれかに記載の車輪用軸受装置。   The structure of the inner surface of the wheel mounting hole is a fine ferrite / pearlite structure, an upper bainite structure, a lower bainite structure, a tempered martensite structure, or at least a mixed structure of two or more of these structures The wheel bearing device according to any one of claims 1, 2, and 5. 前記外方部材の車体取付フランジが円周方向に不連続に形成され、その突出する複数個の部位に車体取付孔が形成されると共に、この車体取付孔に転造加工によって雌ねじが形成され、当該車体取付孔のインナー側の開口部に凹部が形成されている請求項１に記載の車輪用軸受装置。   A vehicle body mounting flange of the outer member is formed discontinuously in the circumferential direction, and a vehicle body mounting hole is formed at a plurality of protruding portions, and a female screw is formed by rolling in the vehicle body mounting hole, The wheel bearing device according to claim 1, wherein a recess is formed in an opening on the inner side of the vehicle body mounting hole.
JP2012071202A 2012-03-27 2012-03-27 Bearing device for wheel Pending JP2013203107A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2012071202A JP2013203107A (en) 2012-03-27 2012-03-27 Bearing device for wheel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2012071202A JP2013203107A (en) 2012-03-27 2012-03-27 Bearing device for wheel

Publications (1)

Publication Number Publication Date
JP2013203107A true JP2013203107A (en) 2013-10-07

Family

ID=49522707

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2012071202A Pending JP2013203107A (en) 2012-03-27 2012-03-27 Bearing device for wheel

Country Status (1)

Country Link
JP (1) JP2013203107A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000271691A (en) * 1999-03-23 2000-10-03 Hitachi Ltd Plate like connection conductive body with screw and its production
JP2007050857A (en) * 2005-08-19 2007-03-01 Ntn Corp Wheel bearing device
JP2007062502A (en) * 2005-08-30 2007-03-15 Jtekt Corp Wheel mounting structure and wheel mounting method
JP2008296852A (en) * 2007-06-04 2008-12-11 Ntn Corp Wheel bearing device
JP2009113635A (en) * 2007-11-06 2009-05-28 Ntn Corp Wheel bearing device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000271691A (en) * 1999-03-23 2000-10-03 Hitachi Ltd Plate like connection conductive body with screw and its production
JP2007050857A (en) * 2005-08-19 2007-03-01 Ntn Corp Wheel bearing device
JP2007062502A (en) * 2005-08-30 2007-03-15 Jtekt Corp Wheel mounting structure and wheel mounting method
JP2008296852A (en) * 2007-06-04 2008-12-11 Ntn Corp Wheel bearing device
JP2009113635A (en) * 2007-11-06 2009-05-28 Ntn Corp Wheel bearing device

Similar Documents

Publication Publication Date Title
JP5242957B2 (en) Wheel bearing device
EP2617584A1 (en) Vehicle-wheel bearing device
US7942585B2 (en) Wheel bearing apparatus for a vehicle
JP2008174208A (en) Hub ring of bearing device for wheel and method of producing the same
JP2005003061A (en) Wheel bearing device
JP2007062647A (en) Bearing device for driving wheel
JP2009113635A (en) Wheel bearing device
JP4940027B2 (en) Wheel bearing device
WO2010147135A1 (en) Wheel bearing
JP4205752B2 (en) Wheel bearing device
JP4536086B2 (en) Wheel bearing device and manufacturing method thereof
JP5166757B2 (en) Wheel bearing and wheel bearing device provided with the same
JP2010230081A (en) Bearing device for wheel
US7909517B2 (en) Wheel support bearing assembly and manufacturing method thereof
JP2007147064A (en) Bearing device for wheel
JP2013203107A (en) Bearing device for wheel
JP4998980B2 (en) Wheel bearing device
JP2010042733A (en) Bearing device for driving wheel
JP2008121838A (en) Bearing device for wheel
JP2008057599A (en) Bearing device for wheel
JP6429441B2 (en) Wheel bearing device, intermediate body, and manufacturing method thereof
JP2008162356A (en) Bearing device for wheel
JP4969899B2 (en) Wheel bearing device
JP2007315508A (en) Bearing device for wheel
WO2012043706A1 (en) Drive wheel bearing unit and method for manufacturing same

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20141031

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20150630

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20150703

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20151111