JP2023132690A - Bearing device for wheel - Google Patents

Bearing device for wheel Download PDF

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Publication number
JP2023132690A
JP2023132690A JP2022038168A JP2022038168A JP2023132690A JP 2023132690 A JP2023132690 A JP 2023132690A JP 2022038168 A JP2022038168 A JP 2022038168A JP 2022038168 A JP2022038168 A JP 2022038168A JP 2023132690 A JP2023132690 A JP 2023132690A
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Prior art keywords
hub
bolt
axial direction
bolt hole
head
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JP2022038168A
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Japanese (ja)
Inventor
正明 林
Masaaki Hayashi
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Application filed by NTN Corp, NTN Toyo Bearing Co Ltd filed Critical NTN Corp
Priority to JP2022038168A priority Critical patent/JP2023132690A/en
Priority to CN202320251263.4U priority patent/CN219888492U/en
Priority to CN202310100400.9A priority patent/CN116733842A/en
Priority to PCT/JP2023/005705 priority patent/WO2023171317A1/en
Publication of JP2023132690A publication Critical patent/JP2023132690A/en
Pending legal-status Critical Current

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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0005—Hubs with ball bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/001—Hubs with roller-bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/12—Torque-transmitting axles
    • B60B35/14—Torque-transmitting axles composite or split, e.g. half- axles; Couplings between axle parts or sections
    • 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
    • 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
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
    • 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
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
    • F16C19/383—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
    • F16C19/385—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller 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
    • 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
    • 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
    • F16C33/583—Details of specific parts of races

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

To provide a bearing device for a wheel which enables restriction on the design of internal specification to be suppressed and furthermore the maintainability thereof to be improved.SOLUTION: A bearing device 1 for a wheel comprises: an outer ring 2; inner raceway grooves in double rows which are opposed to outer raceway grooves in double rows of the outer ring 2; an inner member (hub ring 3 and inner ring 4) which has a wheel fitting flange 32; ball lines 5, 6 in double rows; and a hub bolt 36 which is press-fit to a bolt hole 35 of the wheel fitting flange 32. The outer ring 2 comprises: a first outer periphery 27; a second outer periphery 28 having a smaller diameter than that of the first outer periphery 27; a difference-in-level surface 29 which connects the first outer periphery 27 with the second outer periphery 28. The outer diameter radial dimension R2 of the first outer periphery 27 is larger than the inscribed circle radius R0 of a head portion 361 in a hub bolt 36 that is press-fit to the bolt hole 35. The outer diameter radial dimension R3 of the second outer periphery 28 is smaller than the inscribed circle radius R0 of the head portion 361 in the hub bolt 36 that is press-fit to the bolt hole 35.SELECTED DRAWING: Figure 3

Description

本発明は車輪用軸受装置に関する。 The present invention relates to a wheel bearing device.

従来、自動車等の車両の懸架装置において車輪を回転自在に支持する車輪用軸受装置が知られている。車輪用軸受装置は、内方部材であるハブ輪が径方向外側に延びるハブフランジを有しており、ハブフランジに形成されるボルト孔には、ハブ輪と車輪等とを締結するためのハブボルトが圧入されている。 BACKGROUND ART Wheel bearing devices that rotatably support wheels in suspension systems for vehicles such as automobiles have been known. In a wheel bearing device, a hub ring, which is an inner member, has a hub flange extending radially outward, and bolt holes formed in the hub flange have hub bolts for fastening the hub ring and the wheel, etc. is press-fitted.

車輪用軸受装置の内部諸元の設計を行う場合、車両重量の増加に伴う耐久性向上や耐圧痕性向上を図るためには、外方部材と内方部材との両軌道溝間に収容されるボールのピッチ円直径（Ｐ．Ｃ．Ｄ．）やボール径を大きくすることが有効である。また、外方部材の外側軌道溝に高周波焼入れを行う際の焼抜けを防止するために、外側軌道溝の底部と外方部材の外周面との間には一定の肉厚を確保することが必要である。 When designing the internal specifications of a wheel bearing device, in order to improve durability and indentation resistance due to increased vehicle weight, it is necessary to It is effective to increase the pitch circle diameter (P.C.D.) and ball diameter of the ball. Additionally, in order to prevent burnout when induction hardening is applied to the outer raceway groove of the outer member, a certain thickness must be ensured between the bottom of the outer raceway groove and the outer peripheral surface of the outer member. is necessary.

このように、ボールのピッチ円直径やボール径を大きくしたり、外方部材の肉厚を大きくしたりすると、外方部材における外周面の外径寸法が大きくなり、ハブフランジに圧入されたハブボルトを引き抜く際に、ハブフランジと外方部材の外周面とが干渉してハブボルトを引き抜くことができず、車輪用軸受装置の整備性が低下するおそれがある。 In this way, when the pitch circle diameter of the ball or the ball diameter is increased, or the wall thickness of the outer member is increased, the outer diameter of the outer peripheral surface of the outer member becomes larger, and the hub bolt press-fitted into the hub flange becomes larger. When pulling out the hub bolt, the hub flange and the outer circumferential surface of the outer member interfere with each other, making it impossible to pull out the hub bolt, which may reduce the maintainability of the wheel bearing device.

このような問題を解決するために、特許文献１には、外方部材である外輪のアウター側端部に設けられる肉厚部の外径部分に、ハブボルトを回転軸に沿って案内する案内溝を形成した車輪用軸受装置が開示されている。 In order to solve such problems, Patent Document 1 discloses that a guide groove for guiding a hub bolt along a rotation axis is provided in an outer diameter portion of a thick wall portion provided at an outer end of an outer ring, which is an outer member. A wheel bearing device is disclosed.

特許第６７２５９９３号公報Patent No. 6725993

しかし、特許文献１に開示される車輪用軸受装置のように、外輪の外径部分に案内溝を形成すると、案内溝が形成された部分の外輪の外径寸法が制約され、ボールのピッチ円直径やボール径等の内部諸元の設計に制約が生じたり、外輪の肉厚を確保することが困難になったりして、十分な耐久性を備えた車輪用軸受装置を設計することができなくなるおそれがある。このような問題は、コンパクト化を図るためにハブボルトを内径側に配置した車輪用軸受装置において顕著である。 However, if a guide groove is formed in the outer diameter portion of the outer ring as in the wheel bearing device disclosed in Patent Document 1, the outer diameter dimension of the outer ring in the portion where the guide groove is formed is restricted, and the pitch circle of the ball is There are constraints on the design of internal dimensions such as diameter and ball diameter, and it becomes difficult to ensure the outer ring thickness, making it impossible to design a wheel bearing device with sufficient durability. There is a risk that it will disappear. Such a problem is noticeable in a wheel bearing device in which the hub bolt is arranged on the inner diameter side in order to achieve compactness.

本発明は以上の如き状況に鑑みてなされたものであり、内部諸元の設計に制約が生じることを抑制しつつ、整備性を向上することができる車輪用軸受装置を提供するものである。 The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a wheel bearing device that can improve maintainability while suppressing restrictions on the design of internal specifications.

即ち、車輪用軸受装置は、内周に複列の外側軌道溝を有する外方部材と、前記複列の外側軌道溝に対向する複列の内側軌道溝と、軸方向の一端部に径方向外側へ延びるハブフランジとを有する内方部材と、前記外方部材と前記内方部材との両軌道溝間に転動自在に収容された複列の転動体と、前記ハブフランジに形成されるボルト孔に圧入されるハブボルトと、を備える車輪用軸受装置であって、前記外方部材は、軸方向一端側の前記外側軌道溝における底部の外径側に位置する第１外周面と、軸方向において前記第１外周面よりも前記ハブフランジ側に位置し、前記第１外周面よりも小径の第２外周面と、軸方向において前記第１外周面と前記第２外周面との間に位置し、前記第１外周面と前記第２外周面とを接続する段差面とを有し、前記第１外周面の外径半径は、前記ボルト孔に圧入された前記ハブボルトにおける頭部の内接円半径よりも大きく、前記第２外周面の外径半径は、前記ボルト孔に圧入された前記ハブボルトにおける前記頭部の内接円半径よりも小さい。 That is, the wheel bearing device includes an outer member having a double row of outer raceway grooves on the inner periphery, a double row of inner raceway grooves facing the double row of outer raceway grooves, and a radial groove at one end in the axial direction. an inner member having a hub flange extending outward; a double row of rolling elements rotatably housed between raceway grooves of the outer member and the inner member; and an inner member formed on the hub flange. A wheel bearing device comprising: a hub bolt press-fitted into a bolt hole; a second outer circumferential surface located closer to the hub flange than the first outer circumferential surface in the direction and having a smaller diameter than the first outer circumferential surface, and between the first outer circumferential surface and the second outer circumferential surface in the axial direction; and a stepped surface connecting the first outer circumferential surface and the second outer circumferential surface, and the outer diameter radius of the first outer circumferential surface is equal to the inner diameter of the head of the hub bolt press-fitted into the bolt hole. The outer diameter radius of the second outer circumferential surface is larger than the tangent radius, and smaller than the inscribed circle radius of the head of the hub bolt press-fitted into the bolt hole.

本発明によれば、車輪用軸受装置の内部諸元の設計に制約が生じることを抑制しつつ、車輪用軸受装置の整備性を向上することができる。 According to the present invention, it is possible to improve the maintainability of the wheel bearing device while suppressing restrictions on the design of the internal specifications of the wheel bearing device.

車輪用軸受装置を示す側面断面図である。It is a side sectional view showing a bearing device for wheels. ハブボルトを示す側面図である。It is a side view showing a hub bolt. ボルト孔に圧入されたハブボルトの頭部と外輪の第２外周面とが径方向において離間している状態の車輪用軸受装置を示す側面断面図である。FIG. 7 is a side sectional view showing the wheel bearing device in a state where the head of the hub bolt press-fitted into the bolt hole and the second outer circumferential surface of the outer ring are separated in the radial direction. 外径側へ向けて凹となる曲面により形成された段差面を示す側面断面図である。FIG. 3 is a side cross-sectional view showing a stepped surface formed by a curved surface that is concave toward the outer diameter side. 外径側へ向けて凸となる曲面により形成された段差面を示す側面断面図である。FIG. 3 is a side cross-sectional view showing a stepped surface formed by a curved surface that is convex toward the outer diameter side. ボルト孔から軸方向に沿って引き抜いたハブボルトの頭部と段差面の接触部とが接触した状態の車輪用軸受装置を示す側面断面図である。FIG. 3 is a side sectional view showing the wheel bearing device in a state where the head of the hub bolt pulled out from the bolt hole along the axial direction and the contact portion of the stepped surface are in contact with each other. ボルト孔の傾斜面を示す側面断面図である。FIG. 3 is a side sectional view showing an inclined surface of a bolt hole. ハブボルトをボルト孔から引き抜く際の手順を示す図である。It is a figure which shows the procedure when pulling out a hub bolt from a bolt hole. 平行移動工程において、ハブボルトを外径側へ平行移動させた状態の車輪用軸受装置を示す側面断面図である。FIG. 2 is a side cross-sectional view showing the wheel bearing device in a state where the hub bolt is translated in parallel toward the outer diameter side in a parallel movement process. 追加引き抜き工程において、頭部が段差面に接触するまで、軸方向に沿ってさらにインナー側へ引き抜いた状態の車輪用軸受装置を示す側面断面図である。FIG. 7 is a side sectional view showing the wheel bearing device in a state where it is further pulled out toward the inner side along the axial direction until the head comes into contact with the stepped surface in the additional pulling out step. 傾斜工程において、ハブボルトを軸方向に対して頭部が軸部よりも外径側へ位置する側へ傾斜させた状態の車輪用軸受装置を示す側面断面図である。FIG. 3 is a side sectional view showing the wheel bearing device in which the hub bolt is tilted in the axial direction so that the head thereof is located on the outer diameter side of the shaft portion in the tilting step. 完全引き抜き工程において、ハブボルトを傾斜させた方向に沿ってボルト孔から引き抜いた状態の車輪用軸受装置を示す側面断面図である。FIG. 3 is a side sectional view showing the wheel bearing device in a state where the hub bolt is pulled out from the bolt hole along the direction in which the hub bolt is inclined in the complete pulling out process. ハブボルトをボルト孔に圧入する際の手順を示す図である。It is a figure which shows the procedure at the time of press-fitting a hub bolt into a bolt hole.

以下に、本発明を実施するための形態を、添付の図面を用いて説明する。 EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using an attached drawing.

［車輪用軸受装置］
図１に示す車輪用軸受装置１は、本発明に係る車輪用軸受装置の一実施形態であり、自動車等の車両の懸架装置において車輪を回転自在に支持するものである。 [Wheel bearing device]
A wheel bearing device 1 shown in FIG. 1 is an embodiment of a wheel bearing device according to the present invention, and is used to rotatably support a wheel in a suspension system of a vehicle such as an automobile.

車輪用軸受装置１は第３世代と称呼される構成を備えており、外方部材である外輪２と、内方部材であるハブ輪３および内輪４と、転動列である二列のインナー側ボール列５およびアウター側ボール列６と、アウター側シール部材９と、インナー側シール部材１０とを具備する。 The wheel bearing device 1 has a configuration called third generation, and includes an outer ring 2 as an outer member, a hub ring 3 and an inner ring 4 as inner members, and two rows of inner wheels as rolling rows. It includes a side ball row 5, an outer ball row 6, an outer seal member 9, and an inner seal member 10.

以下の説明において、軸方向とは車輪用軸受装置１の回転軸心Ｘに沿った方向を表す。また、アウター側とは、軸方向一端側であって車体に取り付けた際の車輪用軸受装置１の車輪側を表し、インナー側とは、軸方向他端側であって車体に取り付けた際の車輪用軸受装置１の車体側を表す。 In the following description, the axial direction refers to the direction along the rotation axis X of the wheel bearing device 1. Further, the outer side refers to the wheel side of the wheel bearing device 1 that is one end in the axial direction and is attached to the vehicle body, and the inner side refers to the other end in the axial direction and refers to the wheel side of the wheel bearing device 1 when it is attached to the vehicle body. The vehicle body side of the wheel bearing device 1 is shown.

外輪２のインナー側端部には、インナー側シール部材１０が嵌合可能なインナー側開口部２１が形成されている。外輪２のアウター側端部には、アウター側シール部材９が嵌合可能なアウター側開口部２２が形成されている。 An inner opening 21 into which the inner seal member 10 can be fitted is formed at the inner end of the outer ring 2 . An outer opening 22 into which the outer seal member 9 can fit is formed at the outer end of the outer ring 2 .

インナー側シール部材１０がインナー側開口部２１に嵌合されることにより、外方部材である外輪２と内方部材であるハブ輪３および内輪４とによって形成された環状空間Ｓのインナー側の開口端が塞がれている。アウター側シール部材９がアウター側開口部２２に嵌合されることにより、環状空間Ｓのアウター側の開口端が塞がれている。 By fitting the inner side sealing member 10 into the inner side opening 21, the inner side of the annular space S formed by the outer ring 2 as the outer member and the hub ring 3 and inner ring 4 as the inner members. The open end is blocked. By fitting the outer seal member 9 into the outer opening 22, the outer opening end of the annular space S is closed.

インナー側シール部材１０およびアウター側シール部材９は、環状空間Ｓの開口端を塞ぐ密封装置である。このように、インナー側シール部材１０およびアウター側シール部材９により環状空間Ｓのインナー側およびアウター側の開口端を塞ぐことで、泥水等の異物が車輪用軸受装置１の内部へ浸入することを抑制している。 The inner seal member 10 and the outer seal member 9 are sealing devices that close the open end of the annular space S. In this way, by blocking the inner and outer opening ends of the annular space S with the inner seal member 10 and the outer seal member 9, foreign matter such as muddy water is prevented from entering the inside of the wheel bearing device 1. It's suppressed.

外輪２の内周面には、インナー側の外側軌道溝２３と、アウター側の外側軌道溝２４とが形成されている。外輪２の外周面には、外輪２を車体側部材に取り付けるための車体取り付けフランジ２５が一体的に形成されている。車体取り付けフランジ２５には、車体側部材と外輪２とを締結する締結部材（ここでは、ボルト）が挿入されるボルト孔２６が設けられている。 An inner outer raceway groove 23 and an outer outer raceway groove 24 are formed on the inner peripheral surface of the outer ring 2 . A vehicle body attachment flange 25 for attaching the outer race 2 to a vehicle body member is integrally formed on the outer peripheral surface of the outer race 2 . The vehicle body attachment flange 25 is provided with a bolt hole 26 into which a fastening member (here, a bolt) for fastening the vehicle body side member and the outer ring 2 is inserted.

ハブ輪３の外周面におけるインナー側端部には、アウター側端部よりも縮径された小径段部３１が形成されている。ハブ輪３のアウター側端部には、車輪を取り付けるための車輪取り付けフランジ３２が一体的に形成されている。車輪取り付けフランジ３２は、ハブフランジの一例である。車輪取り付けフランジ３２には、複数のボルト孔３５が形成されている。ボルト孔３５には、ハブ輪３と車輪又はブレーキ部品とを締結するためのハブボルト３６が圧入可能である。 A small-diameter stepped portion 31 is formed at the inner end of the outer circumferential surface of the hub ring 3, the diameter of which is smaller than that of the outer end. A wheel attachment flange 32 for attaching a wheel is integrally formed at the outer end of the hub wheel 3. The wheel attachment flange 32 is an example of a hub flange. A plurality of bolt holes 35 are formed in the wheel mounting flange 32. A hub bolt 36 for fastening the hub wheel 3 and a wheel or a brake component can be press-fitted into the bolt hole 35.

ハブ輪３においては、車輪取り付けフランジ３２の基部側にアウター側シール部材９が摺接する摺接面３４が形成されている。ハブ輪３の外周面には、外輪２のアウター側の外側軌道溝２４に対向するようにアウター側の内側軌道溝３３が設けられている。つまり、内方部材のアウター側には、ハブ輪３によって内側軌道溝３３が構成されている。 In the hub wheel 3, a sliding surface 34 on which the outer seal member 9 slides is formed on the base side of the wheel mounting flange 32. An outer inner raceway groove 33 is provided on the outer peripheral surface of the hub ring 3 so as to face the outer raceway groove 24 on the outer side of the outer ring 2 . That is, an inner raceway groove 33 is formed by the hub ring 3 on the outer side of the inner member.

ハブ輪３の小径段部３１には、内輪４が設けられている。内輪４は、圧入によりハブ輪３の小径段部３１に固定されている。内輪４の外周面には、外輪２のインナー側の外側軌道溝２３と対向するようにインナー側の内側軌道溝４１が設けられている。つまり、内方部材のインナー側には、内輪４によって内側軌道溝４１が構成されている。 An inner ring 4 is provided in the small diameter stepped portion 31 of the hub ring 3. The inner ring 4 is fixed to the small diameter stepped portion 31 of the hub ring 3 by press fitting. An inner raceway groove 41 on the inner side is provided on the outer peripheral surface of the inner ring 4 so as to face the outer raceway groove 23 on the inner side of the outer ring 2 . That is, the inner raceway groove 41 is formed by the inner ring 4 on the inner side of the inner member.

転動列であるインナー側ボール列５とアウター側ボール列６とは、転動体である複数のボール７が保持器８によって保持されることにより構成されている。インナー側ボール列５は、内輪４の内側軌道溝４１と、外輪２のインナー側の外側軌道溝２３との間に転動自在に挟まれている。アウター側ボール列６は、ハブ輪３の内側軌道溝３３と、外輪２のアウター側の外側軌道溝２４との間に転動自在に挟まれている。つまり、インナー側ボール列５とアウター側ボール列６とは、外方部材と内方部材との両軌道溝間に転動自在に収容されている。 The inner ball row 5 and the outer ball row 6, which are rolling rows, are constituted by a plurality of balls 7, which are rolling elements, held by a retainer 8. The inner ball row 5 is rotatably sandwiched between the inner raceway groove 41 of the inner ring 4 and the outer raceway groove 23 on the inner side of the outer ring 2. The outer ball row 6 is rotatably sandwiched between the inner raceway groove 33 of the hub ring 3 and the outer raceway groove 24 on the outer side of the outer ring 2. That is, the inner ball row 5 and the outer ball row 6 are rotatably accommodated between the raceway grooves of the outer member and the inner member.

車輪用軸受装置１においては、外輪２と、ハブ輪３および内輪４と、インナー側ボール列５と、アウター側ボール列６とによって複列アンギュラ玉軸受が構成されている。なお、車輪用軸受装置１は複列アンギュラ玉軸受に替えて複列円錐ころ軸受を構成していてもよい。 In the wheel bearing device 1, an outer ring 2, a hub ring 3, an inner ring 4, an inner ball row 5, and an outer ball row 6 constitute a double row angular contact ball bearing. Note that the wheel bearing device 1 may include a double-row tapered roller bearing instead of the double-row angular ball bearing.

［ハブボルト］
図２に示すように、ハブボルト３６は、頭部３６１と、ナール部３６２と、軸部３６３と、雄ねじ部３６４とを備えている。頭部３６１は、ハブボルト３６がボルト孔３５に圧入された状態において、ハブボルト３６のインナー側端部に位置している。頭部３６１は、車輪取り付けフランジ３２のインナー側に位置している。頭部３６１は、外径Ｄ１を有している。 [Hub bolt]
As shown in FIG. 2, the hub bolt 36 includes a head 361, a knurled portion 362, a shaft portion 363, and a male threaded portion 364. The head 361 is located at the inner end of the hub bolt 36 when the hub bolt 36 is press-fitted into the bolt hole 35. The head 361 is located on the inner side of the wheel attachment flange 32. The head 361 has an outer diameter D1.

ナール部３６２は、ハブボルト３６におけるボルト孔３５に圧入される部分であり、ナール部３６２には軸方向に延びるナールが周方向に複数形成されている。ナール部３６２は、頭部３６１のアウター側に隣接して位置しており、頭部３６１の外径Ｄ１よりも小径の外径Ｄ２を有している。 The knurl portion 362 is a portion of the hub bolt 36 that is press-fitted into the bolt hole 35, and the knurl portion 362 has a plurality of axially extending knurls formed in the circumferential direction. The knurl portion 362 is located adjacent to the outer side of the head 361 and has an outer diameter D2 smaller than an outer diameter D1 of the head 361.

軸部３６３は、ナール部３６２のアウター側に隣接して位置しており、ナール部３６２の外径Ｄ２よりも小径の外径Ｄ３を有している。雄ねじ部３６４は、軸部３６３のアウター側に隣接して位置しており、軸部３６３の外径Ｄ３と略同径の外径Ｄ４を有している。ボルト孔３５に圧入されたハブボルト３６の雄ねじ部３６４にナットを螺装することで、ハブ輪３と車輪またはブレーキ部品とを締結することができる。 The shaft portion 363 is located adjacent to the outer side of the knurled portion 362 and has an outer diameter D3 smaller than an outer diameter D2 of the knurled portion 362. The male threaded portion 364 is located adjacent to the outer side of the shaft portion 363 and has an outer diameter D4 that is approximately the same as the outer diameter D3 of the shaft portion 363. By threading a nut onto the male threaded portion 364 of the hub bolt 36 press-fitted into the bolt hole 35, the hub wheel 3 and the wheel or brake component can be fastened together.

図３に示すように、ハブボルト３６は、車輪取り付けフランジ３２のインナー側からボルト孔３５に圧入可能であり、ボルト孔３５に圧入されたハブボルト３６の頭部３６１は、車輪取り付けフランジ３２のインナー側端面３２１に接触している。インナー側端面３２１は、ハブフランジの軸方向における他端側端面の一例である。 As shown in FIG. 3, the hub bolt 36 can be press-fitted into the bolt hole 35 from the inner side of the wheel mounting flange 32, and the head 361 of the hub bolt 36 press-fitted into the bolt hole 35 is inserted into the bolt hole 35 from the inner side of the wheel mounting flange 32. It is in contact with the end surface 321. The inner side end surface 321 is an example of the other end side end surface in the axial direction of the hub flange.

ボルト孔３５に圧入されたハブボルト３６における頭部３６１の内接円半径はＲ０である。内接円半径Ｒ０は、頭部３６１のなかで回転軸心Ｘに最も近い箇所と、回転軸心Ｘとの間の径方向における長さである。つまり、内接円半径Ｒ０は、回転軸心Ｘを中心とする円であって、頭部３６１のなかで回転軸心Ｘに最も近い箇所に接する円の半径である。 The radius of the inscribed circle of the head 361 of the hub bolt 36 press-fitted into the bolt hole 35 is R0. The inscribed circle radius R0 is the length in the radial direction between the part of the head 361 that is closest to the rotation axis X and the rotation axis X. That is, the inscribed circle radius R0 is a circle centered on the rotation axis X, and is the radius of a circle that is in contact with the portion of the head 361 that is closest to the rotation axis X.

［外輪］
図３に示すように、外輪２のアウター側の外側軌道溝２４は、底部２４ａを有している。底部２４ａは、外側軌道溝２４のなかで車輪用軸受装置１の回転軸心Ｘからの内径半径の寸法が最も大きい箇所である。底部２４ａの回転軸心Ｘからの内径半径の寸法は内径半径寸法Ｒ１である。内径半径寸法Ｒ１は、ボール７のピッチ円直径（Ｐ．Ｃ．Ｄ．）や径等といった車輪用軸受装置１の内部諸元によって決定される寸法である。 [Outer ring]
As shown in FIG. 3, the outer raceway groove 24 on the outer side of the outer ring 2 has a bottom portion 24a. The bottom portion 24a is a portion of the outer raceway groove 24 that has the largest inner diameter radius from the rotation axis X of the wheel bearing device 1. The inner radius of the bottom portion 24a from the rotation axis X is the inner radius R1. The inner radius dimension R1 is a dimension determined by the internal specifications of the wheel bearing device 1, such as the pitch circle diameter (P.C.D.) and diameter of the balls 7.

外輪２は、第１外周面２７と、第２外周面２８と、段差面２９とを有している。第１外周面２７は、アウター側の外側軌道溝２４における底部２４ａの外径側に位置している。 The outer ring 2 has a first outer circumferential surface 27 , a second outer circumferential surface 28 , and a step surface 29 . The first outer circumferential surface 27 is located on the outer diameter side of the bottom portion 24a of the outer raceway groove 24 on the outer side.

外輪２の径方向における底部２４ａと第１外周面２７との間の肉厚寸法はｄである。肉厚寸法ｄは、例えば外側軌道溝２４に高周波焼入れを行う際の焼抜けを防止するために必要な寸法を考慮して決定される寸法である。第１外周面２７の回転軸心Ｘからの外径半径の寸法は外径半径寸法Ｒ２である。外径半径寸法Ｒ２は、少なくとも底部２４ａの内径半径寸法Ｒ１に外輪２の肉厚寸法ｄを加えた値に設定することができる。 The wall thickness dimension between the bottom portion 24a and the first outer circumferential surface 27 in the radial direction of the outer ring 2 is d. The wall thickness dimension d is determined, for example, in consideration of a dimension necessary to prevent burn-through when induction hardening is performed on the outer raceway groove 24. The outer radius of the first outer circumferential surface 27 from the rotation axis X is the outer radius R2. The outer radius dimension R2 can be set to at least a value obtained by adding the wall thickness dimension d of the outer ring 2 to the inner diameter radius dimension R1 of the bottom portion 24a.

第２外周面２８は、軸方向において第１外周面２７よりも車輪取り付けフランジ３２側となる、外輪２のアウター側端部に位置している。第２外周面２８の回転軸心Ｘからの外径半径の寸法は外径半径寸法Ｒ３である。外径半径寸法Ｒ３は、第１外周面２７の外径半径寸法Ｒ２よりも小径となるように形成されている。 The second outer circumferential surface 28 is located at the outer end of the outer ring 2, which is closer to the wheel attachment flange 32 than the first outer circumferential surface 27 in the axial direction. The outer radius of the second outer circumferential surface 28 from the rotation axis X is the outer radius R3. The outer radius dimension R3 is formed to be smaller than the outer diameter radius dimension R2 of the first outer circumferential surface 27.

段差面２９は、軸方向において第１外周面２７と第２外周面２８との間に位置し、第１外周面２７と第２外周面２８とを接続している。段差面２９のインナー側端部は第１外周面２７と接続され、段差面２９のアウター側端部は第２外周面２８と接続されている。 The step surface 29 is located between the first outer circumferential surface 27 and the second outer circumferential surface 28 in the axial direction, and connects the first outer circumferential surface 27 and the second outer circumferential surface 28. An inner end of the stepped surface 29 is connected to the first outer peripheral surface 27 , and an outer end of the stepped surface 29 is connected to the second outer peripheral surface 28 .

段差面２９は、アウター側端部からインナー側端部へ至るに従って直線的に拡径するテーパ面により形成されている。但し、段差面２９は、図４に示す段差面２９Ａのように、アウター側端部からインナー側端部へ至るに従って拡径し、外径側へ向けて凹となる曲面により形成することもできる。また、段差面２９は、図５に示す段差面２９Ｂのように、アウター側端部からインナー側端部へ至るに従って拡径し、外径側へ向けて凸となる曲面により形成することもできる。 The stepped surface 29 is formed of a tapered surface whose diameter increases linearly from the outer end to the inner end. However, the stepped surface 29 can also be formed by a curved surface that increases in diameter from the outer end to the inner end and becomes concave toward the outer diameter, like the stepped surface 29A shown in FIG. . Further, the step surface 29 can also be formed by a curved surface that increases in diameter from the outer end to the inner end and becomes convex toward the outer diameter, like the step surface 29B shown in FIG. .

このように、段差面２９を、テーパ面、外径側へ向けて凹となる曲面、または外径側へ向けて凸となる曲面により形成することを可能とすることで、外輪２の外形形状を設計する際の自由度を高めることができる。 In this way, by making it possible to form the stepped surface 29 with a tapered surface, a curved surface that is concave toward the outer diameter side, or a curved surface that is convex toward the outer diameter side, the outer shape of the outer ring 2 can be changed. The degree of freedom in designing can be increased.

第１外周面２７、第２外周面２８、および段差面２９は鍛造加工により形成することができる。また、外輪２を鍛造加工により形成した後に、外輪２の外周面に旋削加工を施すことにより、第１外周面２７、第２外周面２８、および段差面２９を形成することもできる。つまり、第１外周面２７、第２外周面２８、および段差面２９は、鍛造肌を有した仕様、または旋削加工面を有した仕様に形成することができる。 The first outer circumferential surface 27, the second outer circumferential surface 28, and the stepped surface 29 can be formed by forging. Further, the first outer circumferential surface 27, the second outer circumferential surface 28, and the stepped surface 29 can also be formed by performing a turning process on the outer circumferential surface of the outer ring 2 after forming the outer ring 2 by forging. That is, the first outer circumferential surface 27, the second outer circumferential surface 28, and the step surface 29 can be formed to have a forged surface or a turned surface.

第１外周面２７、第２外周面２８、および段差面２９を鍛造加工時の鍛造肌を有した仕様に形成した場合、第１外周面２７、第２外周面２８、および段差面２９に旋削加工を施す必要がなく、車輪用軸受装置１の製造工程の簡略化を図ることができる。一方、第１外周面２７、第２外周面２８、および段差面２９に旋削加工を施して、第１外周面２７、第２外周面２８、および段差面２９が旋削加工面を有した仕様に形成した場合、第１外周面２７、第２外周面２８、および段差面２９の外径形状および外径半径寸法を高精度に仕上げることができる。 When the first outer circumferential surface 27, the second outer circumferential surface 28, and the step surface 29 are formed to have a forged skin during forging, the first outer circumferential surface 27, the second outer circumferential surface 28, and the step surface 29 are lathed. There is no need to perform processing, and the manufacturing process of the wheel bearing device 1 can be simplified. On the other hand, the first outer circumferential surface 27, the second outer circumferential surface 28, and the step surface 29 are turned, so that the first outer circumferential surface 27, the second outer circumferential surface 28, and the step surface 29 have turned surfaces. When formed, the outer diameter shape and outer diameter radius dimension of the first outer circumferential surface 27, the second outer circumferential surface 28, and the stepped surface 29 can be finished with high accuracy.

第１外周面２７の外径半径寸法Ｒ２は、ボルト孔３５に圧入されたハブボルト３６における頭部３６１の内接円半径Ｒ０よりも大きく形成されており（Ｒ２＞Ｒ０）、第２外周面２８の外径半径寸法Ｒ３は、ボルト孔３５に圧入されたハブボルト３６における頭部３６１の内接円半径Ｒ０よりも小さく形成されている（Ｒ３＜Ｒ０）。 The outer radius R2 of the first outer circumferential surface 27 is larger than the radius R0 of the inscribed circle of the head 361 of the hub bolt 36 press-fitted into the bolt hole 35 (R2>R0), and the second outer circumferential surface 28 The outer radius R3 is smaller than the radius R0 of the inscribed circle of the head 361 of the hub bolt 36 press-fitted into the bolt hole 35 (R3<R0).

ボルト孔３５に圧入されたハブボルト３６の頭部３６１と、外輪２の第２外周面２８とは軸方向において重なった位置にあるが、第２外周面２８の外径半径寸法Ｒ３は頭部３６１の内接円半径Ｒ０よりも小さく形成されているため、ボルト孔３５に圧入されたハブボルト３６の頭部３６１と、外輪２の第２外周面２８とは径方向において離間しており、干渉しない。 The head 361 of the hub bolt 36 press-fitted into the bolt hole 35 and the second outer circumferential surface 28 of the outer ring 2 overlap in the axial direction. The head 361 of the hub bolt 36 press-fitted into the bolt hole 35 and the second outer circumferential surface 28 of the outer ring 2 are separated in the radial direction and do not interfere with each other. .

一方、図６に示すように、第１外周面２７の外径半径寸法Ｒ２は、ボルト孔３５に圧入されたハブボルト３６における頭部３６１の内接円半径Ｒ０よりも大きく形成されているため、ボルト孔３５に圧入されたハブボルト３６を、軸方向に沿ってアウター側へ引き抜くと、ハブボルト３６の頭部３６１が段差面２９の接触部２９１に接触する。接触部２９１は、ボルト孔３５に圧入されたハブボルト３６をボルト孔３５から軸方向に沿って引き抜いたときに、ハブボルト３６の頭部３６１が接触する部分である。 On the other hand, as shown in FIG. 6, the outer radius R2 of the first outer peripheral surface 27 is larger than the radius R0 of the inscribed circle of the head 361 of the hub bolt 36 press-fitted into the bolt hole 35. When the hub bolt 36 press-fitted into the bolt hole 35 is pulled out toward the outer side along the axial direction, the head 361 of the hub bolt 36 comes into contact with the contact portion 291 of the stepped surface 29. The contact portion 291 is a portion with which the head 361 of the hub bolt 36 comes into contact when the hub bolt 36 press-fitted into the bolt hole 35 is pulled out from the bolt hole 35 along the axial direction.

図３、図６に示すように、ハブボルト３６の頭部３６１は、ボルト孔３５に圧入されたハブボルト３６をボルト孔３５から軸方向に沿ってインナー側へ引き抜いたときに、段差面２９の接触部２９１に接触する被接触部３６１ａを有している。ハブボルト３６においては、軸方向における頭部３６１の被接触部３６１ａからナール部３６２のアウター側端部３６２ａまでの寸法はＬ１である。 As shown in FIGS. 3 and 6, the head 361 of the hub bolt 36 comes into contact with the step surface 29 when the hub bolt 36 press-fitted into the bolt hole 35 is pulled out from the bolt hole 35 toward the inner side along the axial direction. It has a contacted portion 361a that comes into contact with the portion 291. In the hub bolt 36, the dimension from the contacted portion 361a of the head 361 to the outer end 362a of the knurled portion 362 in the axial direction is L1.

図６に示すように、車輪用軸受装置１においては、軸方向における車輪取り付けフランジ３２のインナー側端面３２１から接触部２９１までの寸法はＬ２である。寸法Ｌ２は、ハブボルト３６の寸法Ｌ１よりも大きく形成されている（Ｌ２＞Ｌ１） As shown in FIG. 6, in the wheel bearing device 1, the dimension from the inner side end surface 321 of the wheel mounting flange 32 to the contact portion 291 in the axial direction is L2. The dimension L2 is larger than the dimension L1 of the hub bolt 36 (L2>L1)

図７に示すように、車輪取り付けフランジ３２のボルト孔３５は、インナー側端部に、インナー側へいくに従って拡径する傾斜面３５１を有している。傾斜面３５１の軸方向に対する傾斜角度θは、４５°以上となるように設定されている。 As shown in FIG. 7, the bolt hole 35 of the wheel mounting flange 32 has an inclined surface 351 at the inner end thereof, the diameter of which increases toward the inner side. The inclination angle θ of the inclined surface 351 with respect to the axial direction is set to be 45° or more.

外輪２における第１外周面２７、第２外周面２８、および段差面２９を含む外周面は、周方向において、外輪２の外周面にハブボルト３６を軸方向に沿って案内する案内溝を形成した場合のような凹凸形状を有していない。 The outer circumferential surface of the outer ring 2 including the first outer circumferential surface 27, the second outer circumferential surface 28, and the stepped surface 29 has a guide groove formed in the outer circumferential surface of the outer ring 2 in the circumferential direction to guide the hub bolt 36 along the axial direction. It does not have an uneven shape like the case.

仮に、外輪２の外周面にハブボルト３６を案内する案内溝を形成した場合は、外周面の周方向における外形形状が複雑になるため、鍛造工法によって形成される外輪２の鍛造金型の寿命が低下するおそれがある。しかし、外輪２においては、外周面にハブボルト３６を案内する案内溝は形成されておらず、外周面の周方向における外形形状が複雑ではないため、鍛造金型の寿命が低下することを抑制可能である。 If a guide groove for guiding the hub bolt 36 is formed on the outer circumferential surface of the outer ring 2, the outer shape of the outer circumferential surface in the circumferential direction will become complicated, which will shorten the life of the forging die for the outer ring 2 formed by the forging method. There is a risk that it will decrease. However, in the outer ring 2, no guide groove for guiding the hub bolt 36 is formed on the outer circumferential surface, and the outer shape of the outer circumferential surface in the circumferential direction is not complicated, so it is possible to suppress the reduction in the life of the forging die. It is.

［車輪用軸受装置の整備方法］
次に、車輪取り付けフランジ３２のボルト孔３５に対してハブボルト３６を抜き差しして車輪用軸受装置１の整備を行う際の、車輪用軸受装置１の整備方法について説明する。具体的には、ボルト孔３５に圧入されたハブボルト３６をボルト孔３５から引き抜く際の手順、およびボルト孔３５にハブボルト３６を圧入する際の手順について説明する。 [How to maintain wheel bearing devices]
Next, a method of servicing the wheel bearing device 1 when servicing the wheel bearing device 1 by inserting and removing the hub bolt 36 into and out of the bolt hole 35 of the wheel mounting flange 32 will be described. Specifically, a procedure for pulling out the hub bolt 36 press-fitted into the bolt hole 35 from the bolt hole 35 and a procedure for press-fitting the hub bolt 36 into the bolt hole 35 will be described.

（ハブボルトをボルト孔から引き抜く際の手順）
図３に示すように、ハブボルト３６が車輪取り付けフランジ３２のボルト孔３５に圧入された状態では、ハブボルト３６の頭部３６１は、車輪取り付けフランジ３２のインナー側端面３２１に接触している。ボルト孔３５に圧入されたハブボルト３６の頭部３６１と、外輪２の第２外周面２８とは軸方向において重なった位置にあり、外輪２の段差面２９および第１外周面２７は頭部３６１のインナー側に位置している。 (Procedure for pulling out the hub bolt from the bolt hole)
As shown in FIG. 3, when the hub bolt 36 is press-fitted into the bolt hole 35 of the wheel mounting flange 32, the head 361 of the hub bolt 36 is in contact with the inner end surface 321 of the wheel mounting flange 32. The head 361 of the hub bolt 36 press-fitted into the bolt hole 35 and the second outer circumferential surface 28 of the outer ring 2 overlap in the axial direction, and the stepped surface 29 and the first outer circumferential surface 27 of the outer ring 2 overlap the head 361 It is located on the inner side.

このようにボルト孔３５に圧入されたハブボルト３６をボルト孔３５から引き抜く際には、図８に示すように、最初にナール部引き抜き工程Ｓ０１を実施する。 When the hub bolt 36 press-fitted into the bolt hole 35 is to be pulled out from the bolt hole 35, as shown in FIG. 8, a knurled part pulling out step S01 is first performed.

図６に示すように、ナール部引き抜き工程Ｓ０１においては、ボルト孔３５に圧入されたハブボルト３６を、頭部３６１の被接触部３６１ａが段差面２９の接触部２９１に接触する位置まで、軸方向に沿ってインナー側へ引き抜く。この場合、車輪取り付けフランジ３２のインナー側端面３２１から接触部２９１までの寸法Ｌ２は、頭部３６１の被接触部３６１ａからナール部３６２のアウター側端部３６２ａまでの寸法Ｌ１よりも大きく形成されているため、ハブボルト３６のナール部３６２は、ボルト孔３５から完全に引き抜かれた状態となる。 As shown in FIG. 6, in the knurled portion drawing step S01, the hub bolt 36 press-fitted into the bolt hole 35 is moved in the axial direction until the contacted portion 361a of the head 361 contacts the contact portion 291 of the stepped surface 29. Pull it out along the inner side. In this case, the dimension L2 from the inner end surface 321 of the wheel mounting flange 32 to the contact portion 291 is larger than the dimension L1 from the contacted portion 361a of the head 361 to the outer end 362a of the knurled portion 362. Therefore, the knurl portion 362 of the hub bolt 36 is completely pulled out from the bolt hole 35.

ナール部引き抜き工程Ｓ０１の実施後においては、ハブボルト３６の軸部３６３がボルト孔３５内に位置している。軸部３６３は、ナール部３６２の外径Ｄ２よりも小径の外径Ｄ３を有しているため、軸部３６３の外周面とボルト孔３５の内周面との間には隙間が存在している。 After performing the knurled portion drawing step S01, the shaft portion 363 of the hub bolt 36 is located within the bolt hole 35. Since the shaft portion 363 has an outer diameter D3 smaller than the outer diameter D2 of the knurled portion 362, there is a gap between the outer peripheral surface of the shaft portion 363 and the inner peripheral surface of the bolt hole 35. There is.

ナール部引き抜き工程Ｓ０１の後に平行移動工程Ｓ０２を実施する。図９に示すように、平行移動工程Ｓ０２においては、ハブボルト３６を、軸部３６３の外周面がボルト孔３５の内周面に接触するまで、外径側へ平行移動させる。ハブボルト３６を外径側へ平行移動させることで、頭部３６１と段差面２９の接触部２９１との間には隙間が生じ、ハブボルト３６をさらにインナー側へ移動させることが可能となる。 A parallel movement step S02 is performed after the knurl portion drawing step S01. As shown in FIG. 9, in the parallel movement step S02, the hub bolt 36 is moved in parallel toward the outer diameter side until the outer circumferential surface of the shaft portion 363 contacts the inner circumferential surface of the bolt hole 35. By moving the hub bolt 36 in parallel toward the outer diameter side, a gap is created between the head 361 and the contact portion 291 of the stepped surface 29, making it possible to move the hub bolt 36 further toward the inner side.

ハブボルト３６の軸部３６３をボルト孔３５の外径側の内周面に接触させて、ハブボルト３６をボルト孔３５内の最外径側に位置させたときにおいても、第１外周面２７の外径半径寸法Ｒ２は、ハブボルト３６における頭部３６１の内接円半径Ｒ４よりも大きい。 Even when the shaft portion 363 of the hub bolt 36 is brought into contact with the inner circumferential surface on the outer diameter side of the bolt hole 35 and the hub bolt 36 is positioned at the outermost diameter side in the bolt hole 35, the outer circumferential surface of the first outer circumferential surface 27 The diameter R2 is larger than the radius R4 of the inscribed circle of the head 361 of the hub bolt 36.

平行移動工程Ｓ０２の後に追加引き抜き工程Ｓ０３を実施する。図１０に示すように、追加引き抜き工程Ｓ０３においては、平行移動工程Ｓ０２において外径側へ平行移動させたハブボルト３６を、頭部３６１が段差面２９に接触するまで、軸方向に沿ってさらにインナー側へ引き抜く。この場合、頭部３６１は、段差面２９の第１外周面２７側端部に接触する。 An additional extraction step S03 is performed after the parallel movement step S02. As shown in FIG. 10, in the additional drawing process S03, the hub bolt 36, which has been translated in parallel to the outer diameter side in the parallel movement process S02, is further moved further along the axial direction until the head 361 contacts the step surface 29. Pull it out to the side. In this case, the head 361 contacts the end of the stepped surface 29 on the first outer circumferential surface 27 side.

つまり、ハブボルト３６は、ボルト孔３５内の最外径側に位置させることで、ナール部引き抜き工程Ｓ０１の実施後の位置からさらにインナー側へ引き抜くことができるが、第１外周面２７の外径半径寸法Ｒ２は、ボルト孔３５内の最外径側に位置したハブボルト３６における頭部３６１の内接円半径Ｒ４よりも大きいため、頭部３６１は段差面２９に当接する。 In other words, by positioning the hub bolt 36 on the outermost side in the bolt hole 35, it can be pulled out further toward the inner side from the position after performing the knurled part pulling out step S01, but the outer diameter of the first outer circumferential surface 27 Since the radius dimension R2 is larger than the inscribed circle radius R4 of the head 361 of the hub bolt 36 located on the outermost radial side within the bolt hole 35, the head 361 comes into contact with the stepped surface 29.

このように、追加引き抜き工程Ｓ０３においては、ボルト孔３５から引き抜かれたナール部３６２を、ボルト孔３５からさらにインナー側へ離れた位置へ移動させることができる。 In this way, in the additional drawing step S03, the knurled portion 362 drawn out from the bolt hole 35 can be moved to a position further away from the bolt hole 35 toward the inner side.

追加引き抜き工程Ｓ０３の後に傾斜工程Ｓ０４を実施する。図１１に示すように、傾斜工程Ｓ０４においては、ハブボルト３６を、軸方向に対して頭部３６１が軸部３６３よりも外径側へ位置する側へ傾斜させる。 A tilting step S04 is performed after the additional drawing step S03. As shown in FIG. 11, in the tilting step S04, the hub bolt 36 is tilted in the axial direction so that the head 361 is located radially outward from the shaft portion 363.

この場合、ハブボルト３６は、例えば軸部３６３がボルト孔３５の内周面におけるインナー側端部の外径側に位置する部分に接触し、雄ねじ部３６４がボルト孔３５の内周面におけるアウター側端部の内径側に位置する部分に接触するまで傾斜させる。このようにハブボルト３６を傾斜させることで、ハブボルト３６の頭部３６１が外輪２の外周面から外径側へ離間する。 In this case, the hub bolt 36 has its shaft portion 363 in contact with a portion located on the outer diameter side of the inner end on the inner peripheral surface of the bolt hole 35, and the male threaded portion 364 on the outer side of the inner peripheral surface of the bolt hole 35. Tilt until it touches the inner diameter side of the end. By inclining the hub bolt 36 in this manner, the head 361 of the hub bolt 36 is separated from the outer peripheral surface of the outer ring 2 toward the outer diameter side.

傾斜工程Ｓ０４の後に完全引き抜き工程Ｓ０５を実施する。図１２に示すように、完全引き抜き工程Ｓ０５においては、ハブボルト３６を、傾斜工程Ｓ０４において傾斜させた方向に沿ってボルト孔３５から引き抜く。この場合、雄ねじ部３６４がボルト孔３５から完全に抜け出るまでハブボルト３６を引き抜く。 After the tilting step S04, a complete drawing step S05 is performed. As shown in FIG. 12, in the complete extraction step S05, the hub bolt 36 is pulled out from the bolt hole 35 along the direction inclined in the inclination step S04. In this case, the hub bolt 36 is pulled out until the male threaded portion 364 is completely removed from the bolt hole 35.

このように、ハブボルト３６を、軸方向に対して頭部３６１が軸部３６３よりも外径側へ位置する側へ傾斜させた状態でボルト孔３５から引き抜くことで、頭部３６１が外輪２の外周面から外径側へ離間した状態でハブボルト３６を引き抜くことができる。従って、外輪２における第１外周面２７の外径半径寸法Ｒ２がハブボルト３６の頭部３６１の内接円半径Ｒ０よりも大きく形成されていたとしても、ハブボルト３６をボルト孔３５から完全に引き抜くことが可能となる。 In this way, by pulling out the hub bolt 36 from the bolt hole 35 with the head 361 inclined in the axial direction toward the outer diameter side than the shaft portion 363, the head 361 is attached to the outer ring 2. The hub bolt 36 can be pulled out while being separated from the outer circumferential surface toward the outer diameter side. Therefore, even if the outer radius R2 of the first outer peripheral surface 27 of the outer ring 2 is larger than the radius R0 of the inscribed circle of the head 361 of the hub bolt 36, the hub bolt 36 cannot be completely pulled out from the bolt hole 35. becomes possible.

また、車輪用軸受装置１においては、ボールのピッチ円直径やボール径を大きくした内部諸元を設計したり、外輪２におけるアウター側の外側軌道溝２４に対応する箇所の肉厚を大きく設計したりして、第１外周面２７の外径半径寸法Ｒ２が頭部３６１の内接円半径Ｒ０よりも大きくなった場合でも、第１外周面２７よりも小径の第２外周面２８および第１外周面２７と第２外周面２８とを接続する段差面２９を形成することで、ハブボルト３６をボルト孔３５から完全に引き抜くことが可能となっている。これにより、車輪用軸受装置１の内部諸元の設計に制約が生じることを抑制しつつ、車輪用軸受装置１の整備性を向上することができる。 In addition, in the wheel bearing device 1, the internal specifications of the balls are designed to have a larger pitch circle diameter and ball diameter, and the wall thickness of the portion of the outer ring 2 corresponding to the outer raceway groove 24 on the outer side is designed to be larger. Even if the outer radius dimension R2 of the first outer circumferential surface 27 becomes larger than the inscribed circle radius R0 of the head 361, the second outer circumferential surface 28 and the first outer circumferential surface having a smaller diameter than the first outer circumferential surface 27 By forming the stepped surface 29 that connects the outer peripheral surface 27 and the second outer peripheral surface 28, it is possible to completely pull out the hub bolt 36 from the bolt hole 35. Thereby, the maintainability of the wheel bearing device 1 can be improved while suppressing restrictions on the design of the internal specifications of the wheel bearing device 1.

特に、車輪用軸受装置１においては、車輪取り付けフランジ３２のインナー側端面３２１から接触部２９１までの寸法Ｌ２が、頭部３６１の被接触部３６１ａからナール部３６２のアウター側端部３６２ａまでの寸法Ｌ１よりも大きいため、ハブボルト３６を頭部３６１が接触部２９１に接触するまで引き抜いたときに、ナール部３６２をボルト孔３５から完全に引き抜くことが可能となっている。これにより、ナール部３６２をボルト孔３５から引き抜いた後に、ハブボルト３６を軸方向に対して容易に傾斜させることが可能となり、ハブボルト３６の引き抜き作業を容易にすることができる。 In particular, in the wheel bearing device 1, the dimension L2 from the inner end surface 321 of the wheel mounting flange 32 to the contact portion 291 is the dimension L2 from the contacted portion 361a of the head 361 to the outer end 362a of the knurled portion 362. Since it is larger than L1, when the hub bolt 36 is pulled out until the head 361 contacts the contact portion 291, the knurl portion 362 can be completely pulled out from the bolt hole 35. Thereby, after the knurled portion 362 is pulled out from the bolt hole 35, the hub bolt 36 can be easily inclined with respect to the axial direction, and the work of pulling out the hub bolt 36 can be facilitated.

また、ハブボルト３６を、軸部３６３がボルト孔３５の内周面におけるインナー側端部の外径側に位置する部分に接触するまで傾斜させた場合、軸部３６３は、ボルト孔３５のインナー側端部に形成される傾斜面３５１に接触することになる。 Further, when the hub bolt 36 is tilted until the shaft portion 363 contacts a portion of the inner peripheral surface of the bolt hole 35 located on the outer diameter side of the inner end portion, the shaft portion 363 is tilted toward the inner side of the bolt hole 35. It will come into contact with an inclined surface 351 formed at the end.

この場合、傾斜面３５１の軸方向に対する傾斜角度θは４５°以上といった大きな角度に設定されているため、ハブボルト３６を軸方向に対して大きく傾斜させることができ、頭部３６１の外輪２の外周面からの離間寸法を大きくすることができる。これにより、ハブボルト３６を傾斜方向に沿って引き抜くときに、頭部３６１が外輪２の外周面と干渉することが抑制され、ハブボルト３６を容易にボルト孔３５から完全に引き抜くことが可能となる。 In this case, since the inclination angle θ of the inclined surface 351 with respect to the axial direction is set to a large angle of 45° or more, the hub bolt 36 can be greatly inclined with respect to the axial direction, and the outer circumference of the outer ring 2 of the head 361 The distance from the surface can be increased. This prevents the head 361 from interfering with the outer peripheral surface of the outer ring 2 when the hub bolt 36 is pulled out along the inclination direction, making it possible to easily and completely pull out the hub bolt 36 from the bolt hole 35.

また、本実施形態における段差面２９は、直線的に拡径するテーパ面により形成されているが、段差面２９を外径側へ向けて凹となる曲面により形成することで、ナール部引き抜き工程Ｓ０１においてハブボルト３６を頭部３６１が段差面２９の接触部２９１に接触するまで引き抜いた際に、ハブボルト３６をよりインナー側へ引き抜いた状態とすることが可能である。これにより、ハブボルト３６を軸方向に対して容易に傾斜させることが可能となり、ハブボルト３６の引き抜き作業を容易にすることができる。 Furthermore, although the step surface 29 in this embodiment is formed by a tapered surface whose diameter expands linearly, by forming the step surface 29 as a curved surface that becomes concave toward the outer diameter side, it is possible to When the hub bolt 36 is pulled out until the head 361 contacts the contact portion 291 of the step surface 29 in S01, it is possible to pull out the hub bolt 36 further toward the inner side. This makes it possible to easily tilt the hub bolt 36 with respect to the axial direction, making it easier to pull out the hub bolt 36.

また、車輪取り付けフランジ３２のインナー側端面３２１から接触部２９１までの寸法Ｌ２が、頭部３６１の被接触部３６１ａからナール部３６２のアウター側端部３６２ａまでの寸法Ｌ１よりも大幅に大きい場合は、ナール部引き抜き工程Ｓ０１において、ハブボルト３６をよりインナー側へ引き抜いた状態とすることが可能である。これにより、ハブボルト３６を軸方向に対して容易に傾斜させることが可能となるため、ナール部引き抜き工程Ｓ０１の後に、平行移動工程Ｓ０２および追加引き抜き工程Ｓ０３を経ることなく、傾斜工程Ｓ０４を実施することが可能である。 Furthermore, if the dimension L2 from the inner end surface 321 of the wheel mounting flange 32 to the contact portion 291 is significantly larger than the dimension L1 from the contacted portion 361a of the head 361 to the outer end 362a of the knurled portion 362, , In the knurl portion drawing step S01, it is possible to draw out the hub bolt 36 further toward the inner side. This makes it possible to easily incline the hub bolt 36 with respect to the axial direction, so after the knurl portion extraction step S01, the inclination step S04 is performed without going through the parallel movement step S02 and the additional extraction step S03. Is possible.

（ハブボルトをボルト孔に圧入する際の手順）
図１３に示すように、ハブボルト３６を車輪取り付けフランジ３２のボルト孔３５に圧入する際には、最初に挿入工程Ｓ１１を実施する。 (Steps to press fit hub bolt into bolt hole)
As shown in FIG. 13, when press-fitting the hub bolt 36 into the bolt hole 35 of the wheel mounting flange 32, an insertion step S11 is first performed.

図１２に示すように、挿入工程Ｓ１１においては、ハブボルト３６を軸方向に対して頭部３６１が軸部３６３よりも外径側へ位置する側へ傾斜させた姿勢で、インナー側からボルト孔３５へ挿入する。図１１に示すように、挿入工程Ｓ１１においては、軸部３６３がボルト孔３５内に進入する位置までハブボルト３６を挿入する。 As shown in FIG. 12, in the insertion step S11, the hub bolt 36 is placed in a position in which the head 361 is inclined toward the outer diameter side than the shaft portion 363, and the bolt hole 36 is inserted from the inner side. Insert into. As shown in FIG. 11, in the insertion step S11, the hub bolt 36 is inserted to a position where the shaft portion 363 enters the bolt hole 35.

挿入工程Ｓ１１の後に沿軸工程Ｓ１２を実施する。図１０に示すように、沿軸工程Ｓ１２においては、軸方向に対して傾斜した姿勢のハブボルト３６を、軸方向に沿った姿勢となるように移動させる。この場合、例えばハブボルト３６を、軸部３６３の外周面における外径側が、ボルト孔３５の内周面における外径側に接触する位置に移動させる。その後、図９に示すように、ハブボルト３６を、ナール部３６２のアウター側端部３６２ａが車輪取り付けフランジ３２のインナー側端面３２１の近くに位置するまで、軸方向に沿ってアウター側へ移動させる。 After the insertion step S11, an axial step S12 is performed. As shown in FIG. 10, in the axial step S12, the hub bolt 36, which is tilted with respect to the axial direction, is moved to a posture along the axial direction. In this case, for example, the hub bolt 36 is moved to a position where the outer diameter side of the outer peripheral surface of the shaft portion 363 contacts the outer diameter side of the inner peripheral surface of the bolt hole 35 . Thereafter, as shown in FIG. 9, the hub bolt 36 is moved toward the outer side along the axial direction until the outer end 362a of the knurled portion 362 is located near the inner end surface 321 of the wheel mounting flange 32.

沿軸工程Ｓ１２の後に平行移動工程Ｓ１３を実施する。図６に示すように、平行移動工程Ｓ１３においては、ハブボルト３６を、ハブボルト３６の軸心とボルト孔３５の中心とが一致する位置まで内径側へ平行移動させる。ハブボルト３６を内径側へ平行移動させることで、軸部３６３の外周面とボルト孔３５の内周面とが離間する。 A parallel movement step S13 is performed after the axial step S12. As shown in FIG. 6, in the parallel movement step S13, the hub bolt 36 is translated inward to a position where the axis of the hub bolt 36 and the center of the bolt hole 35 coincide. By moving the hub bolt 36 in parallel toward the inner diameter side, the outer circumferential surface of the shaft portion 363 and the inner circumferential surface of the bolt hole 35 are separated from each other.

平行移動工程Ｓ１３の後に圧入工程Ｓ１４を実施する。図３に示すように、圧入工程Ｓ１４においては、ハブボルト３６のナール部３６２をボルト孔３５に圧入する。これにより、ハブボルト３６のボルト孔３５への圧入が完了する。 A press-fitting step S14 is performed after the parallel movement step S13. As shown in FIG. 3, in the press-fitting step S14, the knurled portion 362 of the hub bolt 36 is press-fitted into the bolt hole 35. This completes the press-fitting of the hub bolt 36 into the bolt hole 35.

このように、ハブボルト３６を軸方向に対して頭部３６１が軸部３６３よりも外径側へ位置する側へ傾斜させた状態でボルト孔３５に挿入した後、ハブボルト３６を軸方向に沿った姿勢に移動させてボルト孔３５に圧入することで、外輪２における第１外周面２７の外径半径寸法Ｒ２がハブボルト３６の頭部３６１の内接円半径Ｒ０よりも大きく形成されていたとしても、ハブボルト３６をボルト孔３５に圧入することが可能となる。 In this way, after inserting the hub bolt 36 into the bolt hole 35 with the head 361 inclined toward the radially outer side of the shaft portion 363 with respect to the axial direction, the hub bolt 36 is inserted along the axial direction. Even if the outer radius dimension R2 of the first outer circumferential surface 27 in the outer ring 2 is formed larger than the inscribed circle radius R0 of the head 361 of the hub bolt 36 by moving it to the posture and press-fitting it into the bolt hole 35. , it becomes possible to press fit the hub bolt 36 into the bolt hole 35.

なお、例えば車輪用軸受装置１における寸法Ｌ２が、ハブボルト３６の寸法Ｌ１よりも大幅に大きい場合は、沿軸工程Ｓ１２において軸方向に対して傾斜した姿勢のハブボルト３６を軸方向に沿った姿勢となるように移動させる際に、ハブボルト３６の軸心とボルト孔３５の中心とが一致する位置に直接ハブボルト３６を移動させることで、平行移動工程Ｓ１３を省略して圧入工程Ｓ１４に移行することが可能である。 Note that, for example, if the dimension L2 of the wheel bearing device 1 is significantly larger than the dimension L1 of the hub bolt 36, the hub bolt 36, which is in an inclined position with respect to the axial direction, is changed to a position along the axial direction in the axial process S12. By directly moving the hub bolt 36 to a position where the axis of the hub bolt 36 and the center of the bolt hole 35 coincide with each other, the parallel movement step S13 can be omitted and the process can proceed to the press-fitting step S14. It is possible.

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り、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。 Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments in any way, but is merely an example, and various further modifications may be made without departing from the gist of the present invention. Of course, the scope of the present invention is indicated by the description of the claims, and furthermore, the meaning of equivalents described in the claims and all changes within the scope of the claims are understood. include.

１ 車輪用軸受装置
２ 外輪
３ ハブ輪
４ 内輪
５ インナー側ボール列
６ アウター側ボール列
２３ （インナー側の）外側軌道溝
２４ （アウター側の）外側軌道溝
２４ａ 底部
２７ 第１外周面
２８ 第２外周面
２９ 段差面
３２ 車輪取り付けフランジ
３３ （アウター側の）内側軌道溝
３５ ボルト孔
３６ ハブボルト
４１ （インナー側の）内側軌道溝
２９１ 接触部
３２１ インナー側端面
３５１ 傾斜面
３６１ 頭部
３６１ａ 被接触部
３６２ ナール部
３６２ａ アウター側端部
３６３ 軸部
Ｄ１ （頭部の）外径
Ｄ２ （ナール部の）外径
Ｄ３ （軸部の）外径
Ｌ１ （頭部の被接触部からナール部のアウター側端部までの）寸法
Ｌ２ （車輪取り付けフランジのインナー側端面から接触部までの）寸法
Ｒ０ （ハブボルトがボルト孔に圧入されているときの）内接円半径
Ｒ２ （第１外周面の）外径半径寸法
Ｒ３ （第２外周面の）外径半径寸法
Ｒ４ （ハブボルトの軸部がボルト孔の外径側の内周面に接触しているときの）内接円半径
Ｓ０１ ナール部引き抜き工程
Ｓ０４ 傾斜工程
Ｓ０５ 完全引き抜き工程
Ｓ１１ 挿入工程
Ｓ１２ 沿軸工程
Ｓ１４ 圧入工程
θ 傾斜角度 1 Wheel bearing device 2 Outer ring 3 Hub ring 4 Inner ring 5 Inner ball row 6 Outer ball row 23 Outer raceway groove (on inner side) 24 Outer raceway groove (on outer side) 24a Bottom 27 First outer peripheral surface 28 Second Outer peripheral surface 29 Step surface 32 Wheel mounting flange 33 Inner raceway groove (on outer side) 35 Bolt hole 36 Hub bolt 41 Inner raceway groove (inner side) 291 Contact portion 321 Inner side end surface 351 Inclined surface 361 Head 361a Contacted portion 362 Knurled part 362a Outer side end 363 Shaft part D1 Outer diameter (of the head) D2 Outer diameter (of the knurled part) D3 Outer diameter (of the shaft) L1 (From the contacted part of the head to the outer end of the knurled part L2 Dimension (from the inner end surface of the wheel mounting flange to the contact part) R0 Radius of the inscribed circle (when the hub bolt is press-fitted into the bolt hole) R2 External radius dimension (of the first outer circumferential surface) R3 Outer radius dimension (of the second outer circumferential surface) R4 Radius of the inscribed circle (when the shaft portion of the hub bolt is in contact with the inner circumferential surface on the outer diameter side of the bolt hole) S01 Knurl portion drawing process S04 Inclining process S05 Complete extraction process S11 Insertion process S12 Axial process S14 Press-fitting process θ Inclination angle

Claims (8)

内周に複列の外側軌道溝を有する外方部材と、
前記複列の外側軌道溝に対向する複列の内側軌道溝と、軸方向の一端部に径方向外側へ延びるハブフランジとを有する内方部材と、
前記外方部材と前記内方部材との両軌道溝間に転動自在に収容された複列の転動体と、
前記ハブフランジに形成されるボルト孔に圧入されるハブボルトと、
を備える車輪用軸受装置であって、
前記外方部材は、
軸方向一端側の前記外側軌道溝における底部の外径側に位置する第１外周面と、
軸方向において前記第１外周面よりも前記ハブフランジ側に位置し、前記第１外周面よりも小径の第２外周面と、
軸方向において前記第１外周面と前記第２外周面との間に位置し、前記第１外周面と前記第２外周面とを接続する段差面とを有し、
前記第１外周面の外径半径は、前記ボルト孔に圧入された前記ハブボルトにおける頭部の内接円半径よりも大きく、
前記第２外周面の外径半径は、前記ボルト孔に圧入された前記ハブボルトにおける前記頭部の内接円半径よりも小さいことを特徴とする車輪用軸受装置。 an outer member having a double row of outer raceway grooves on the inner periphery;
an inner member having a double row of inner raceway grooves facing the double row of outer raceway grooves, and a hub flange extending radially outward at one end in the axial direction;
a double row of rolling elements rotatably housed between raceway grooves of the outer member and the inner member;
a hub bolt press-fitted into a bolt hole formed in the hub flange;
A wheel bearing device comprising:
The outer member is
a first outer circumferential surface located on the outer diameter side of the bottom of the outer raceway groove on the one end side in the axial direction;
a second outer circumferential surface located closer to the hub flange than the first outer circumferential surface in the axial direction and having a smaller diameter than the first outer circumferential surface;
a stepped surface located between the first outer circumferential surface and the second outer circumferential surface in the axial direction and connecting the first outer circumferential surface and the second outer circumferential surface;
The outer diameter radius of the first outer circumferential surface is larger than the inscribed circle radius of the head of the hub bolt press-fitted into the bolt hole,
A bearing device for a wheel, wherein an outer diameter radius of the second outer circumferential surface is smaller than an inscribed circle radius of the head of the hub bolt press-fitted into the bolt hole. 前記ハブボルトは、前記頭部と、前記頭部の軸方向一端側に位置し、前記ハブフランジのボルト孔に圧入されるナール部と、前記ナール部の軸方向一端側に位置する軸部とを有し、
前記ナール部は前記頭部よりも小径に形成され、前記軸部は前記ナール部よりも小径に形成され、
前記外方部材の前記段差面は、前記ハブボルトを前記ボルト孔から軸方向に沿って引き抜いたときに、前記ハブボルトの前記頭部が接触する接触部を有し、
前記ハブボルトの前記頭部は、前記ハブボルトを前記ボルト孔から軸方向に沿って引き抜いたときに、前記段差面の前記接触部に接触する被接触部を有し、
前記ハブフランジの軸方向における他端側端面から前記接触部までの寸法は、前記ハブボルトにおける前記頭部の前記被接触部から前記ナール部の軸方向における一端側端部までの寸法よりも大きい請求項１に記載の車輪用軸受装置。 The hub bolt includes the head, a knurled portion located at one axial end of the head and press-fitted into the bolt hole of the hub flange, and a shaft portion located at one axial end of the knurled portion. have,
The knurled portion is formed to have a smaller diameter than the head, and the shaft portion is formed to have a smaller diameter than the knurled portion.
The stepped surface of the outer member has a contact portion with which the head of the hub bolt comes into contact when the hub bolt is pulled out from the bolt hole in the axial direction,
The head of the hub bolt has a contacted portion that comes into contact with the contact portion of the stepped surface when the hub bolt is pulled out from the bolt hole along the axial direction,
A dimension from the other end side end surface of the hub flange in the axial direction to the contact portion is larger than a dimension from the contacted portion of the head of the hub bolt to the one end side end of the knurled portion in the axial direction. Item 1. The wheel bearing device according to item 1. 前記ハブフランジの前記ボルト孔は、軸方向の他端部に軸方向他端側へいくに従って拡径する傾斜面を有しており、
前記傾斜面の軸方向に対する傾斜角度は４５°以上である請求項１または請求項２に記載の車輪用軸受装置。 The bolt hole of the hub flange has an inclined surface at the other end in the axial direction, the diameter of which increases toward the other end in the axial direction,
The wheel bearing device according to claim 1 or 2, wherein the inclined surface has an inclination angle of 45° or more with respect to the axial direction. 前記段差面は、軸方向の一端部から他端部へ至るに従って拡径するテーパ面、または軸方向の一端部から他端部へ至るに従って拡径し、外径側へ向けて凸もしくは凹となる曲面により形成されている請求項１～請求項３の何れか一項に記載の車輪用軸受装置。 The step surface may be a tapered surface whose diameter increases from one end in the axial direction to the other end, or a tapered surface whose diameter increases from one end to the other end in the axial direction, and is convex or concave toward the outer diameter side. The wheel bearing device according to any one of claims 1 to 3, which is formed of a curved surface. 前記ハブボルトの前記軸部を前記ボルト孔の外径側の内周面に接触させて、前記ハブボルトを前記ボルト孔内の最外径側に位置させたときにおいて、前記第１外周面の外径半径は、前記ハブボルトにおける前記頭部の内接円半径よりも大きい請求項１～請求項４の何れか一項に記載の車輪用軸受装置。 When the shaft portion of the hub bolt is brought into contact with the inner peripheral surface on the outer diameter side of the bolt hole and the hub bolt is positioned at the outermost diameter side in the bolt hole, the outer diameter of the first outer peripheral surface The wheel bearing device according to any one of claims 1 to 4, wherein the radius is larger than the radius of the inscribed circle of the head of the hub bolt. 前記段差面は、鍛造肌または旋削加工面を有する請求項１～請求項５の何れか一項に記載の車輪用軸受装置。 The wheel bearing device according to any one of claims 1 to 5, wherein the stepped surface has a forged surface or a turned surface. 請求項１～請求項６の何れか一項に記載の車輪用軸受装置の整備方法であって、
前記ボルト孔に圧入された前記ハブボルトを、前記ハブボルトの前記頭部が前記段差面の前記接触部に接触するまで軸方向他端側へ引き抜くナール部引き抜き工程と、
前記ナール部引き抜き工程の後に実施され、前記ハブボルトを、軸方向に対して前記頭部が前記軸部よりも外径側へ位置する側へ傾斜させる傾斜工程と、
前記傾斜工程の後に実施され、前記ハブボルトを、前記傾斜工程において傾斜させた方向に沿って前記ボルト孔から引き抜く完全引き抜き工程と、
を備えることを特徴とする車輪用軸受装置の整備方法。 A method for servicing a wheel bearing device according to any one of claims 1 to 6, comprising:
a knurled part pulling out step of pulling out the hub bolt press-fitted into the bolt hole toward the other end in the axial direction until the head of the hub bolt contacts the contact part of the stepped surface;
a tilting step, which is carried out after the knurled portion pulling out step, of tilting the hub bolt in a direction in which the head is located radially outward from the shaft with respect to the axial direction;
a complete extraction step carried out after the inclination step, in which the hub bolt is pulled out from the bolt hole along the direction inclined in the inclination step;
A method for servicing a wheel bearing device, comprising: 請求項１～請求項６の何れか一項に記載の車輪用軸受装置の整備方法であって、
前記ハブボルトを、軸方向に対して前記頭部が前記軸部よりも外径側へ位置する側へ傾斜させた姿勢で、軸方向他端側から前記ボルト孔へ挿入する挿入工程と、
前記挿入工程の後に実施され、前記ハブボルトを、軸方向に沿った姿勢に移動させる沿軸工程と、
前記沿軸工程の後に実施され、前記ハブボルトの前記ナール部を前記ボルト孔に圧入する圧入工程と、
を備えることを特徴とする車輪用軸受装置の整備方法。 A method for servicing a wheel bearing device according to any one of claims 1 to 6, comprising:
an insertion step of inserting the hub bolt into the bolt hole from the other end in the axial direction in a posture in which the head is inclined in the axial direction to a side where the head is located radially outward from the shaft portion;
an axial step carried out after the insertion step, in which the hub bolt is moved to a posture along the axial direction;
a press-fitting step, which is carried out after the axial step, and press-fits the knurled portion of the hub bolt into the bolt hole;
A method for servicing a wheel bearing device, comprising:
JP2022038168A 2022-03-11 2022-03-11 Bearing device for wheel Pending JP2023132690A (en)

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JP2022038168A JP2023132690A (en) 2022-03-11 2022-03-11 Bearing device for wheel
CN202320251263.4U CN219888492U (en) 2022-03-11 2023-02-07 Bearing device for wheel
CN202310100400.9A CN116733842A (en) 2022-03-11 2023-02-07 Bearing device for wheel and method for installing bearing device for wheel
PCT/JP2023/005705 WO2023171317A1 (en) 2022-03-11 2023-02-17 Wheel bearing device

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JP3634897B2 (en) * 1995-07-19 2005-03-30 トヨタ自動車株式会社 Bolt fitting structure
JP4013675B2 (en) * 2002-07-16 2007-11-28 株式会社ジェイテクト Rolling bearing device
JP2014189192A (en) * 2013-03-27 2014-10-06 Ntn Corp Bearing device for wheel
JP2017065296A (en) * 2015-09-28 2017-04-06 Ntn株式会社 Bearing device for wheel
JP7056080B2 (en) * 2017-11-01 2022-04-19 日本精工株式会社 Hub unit bearing

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