JP2012184813A - Shaft member of rolling bearing for wheel and method for manufacturing the same - Google Patents

Shaft member of rolling bearing for wheel and method for manufacturing the same Download PDF

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JP2012184813A
JP2012184813A JP2011048882A JP2011048882A JP2012184813A JP 2012184813 A JP2012184813 A JP 2012184813A JP 2011048882 A JP2011048882 A JP 2011048882A JP 2011048882 A JP2011048882 A JP 2011048882A JP 2012184813 A JP2012184813 A JP 2012184813A
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shaft portion
inner ring
shaft
rolling bearing
wheel
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Yoshiaki Masuda
善紀 増田
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JTEKT Corp
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JTEKT Corp
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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
    • 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
    • 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

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

Abstract

PROBLEM TO BE SOLVED: To provide a shaft member for a rolling bearing for a wheel and a method for manufacturing the same in which the shaft member of the rolling bearing for the wheel is integrally formed by cold forging in which positions requiring grinding and polishing after forming are fewer than hot forging and positions requiring quenching and annealing after forming can be reduced by using harder structural carbon steel.SOLUTION: The shaft member 1 of the bearing for the wheel has a shaft part 10, a flange part 21 and a fitting shaft part 30, an adjacent outer peripheral surface 19 is formed in a position adjacent to an inner ring raceway surface 18 formed near a border part of the shaft part and the flange part, the shaft part has a large diameter shaft part 11 in the side near the flange part and a small diameter shaft part 12 far from the same, an inner wheel abutting surface 12a is formed in a step part of the large diameter shaft part and the small diameter shaft part, the quenching and the annealing are carried out in a heat treating step (H), and the inner ring raceway surface 18 is subjected to the quenching and the annealing without subjecting the outer peripheral surface of the small diameter shaft part 12 and the inner wheel abutting surface 12a and the abutting outer peripheral surface 19 to the quenching and the annealing.

Description

本発明は、車輪用転がり軸受装置の軸部材とその製造方法に関する。   The present invention relates to a shaft member of a rolling bearing device for a wheel and a manufacturing method thereof.

車輪用転がり軸受装置に用いられるハブホイールとしての車輪用転がり軸受装置の軸部材、及び当該車輪用転がり軸受装置の軸部材を製造する方法においては、例えば特許文献１〜３に開示されている。
特許文献１に開示された、図６（Ａ）及び（Ｂ）に示す従来の車輪用転がり軸受装置の軸部材１０６の製造方法では、冷間鍛造にて比較的低荷重の側方押し出し成形にて、放射状に延出した複数のフランジ部１０７を軸部１０５と一体的に成形している。図６（Ａ）に示すように、特許文献１に記載された車輪用転がり軸受装置の軸部材１０６の冷間鍛造では、（ａ）の中実状の丸棒部材に前方押出し成形を施して（ｂ）の形状の軸状部材１３０ａを成形する。そして軸状部材１３０ａの頭部をヘディングして外径がほぼφＤ（嵌合軸部の外径）となるまで潰して（ｃ）の形状の軸部素材１３０ｂを成形し、さらに側方押出し成形を施して（ｄ）の形状の車輪用転がり軸受装置の軸部材１０６を成形している。
また、特許文献２に開示された、図６（Ｃ）に示す従来の車輪用転がり軸受装置２０１では、炭素含有量が比較的高い炭素鋼（０．４５質量％以上０．７５質量％以下）を素材として、当該素材を軟化焼鈍処理して冷間鍛造にて車輪用転がり軸受装置の軸部材２０６を成形している。そして車輪用転がり軸受装置の軸部材２０６の軸部２０５における内輪軌道面２１３、隣接外周面２１４（軸部２０５とフランジ部２０７との境界部）、内輪嵌合軸部の外周面２１０、を含む軸部２０５の外周面の全体に高周波焼入れによる硬化層２２２を形成している。
また、特許文献３に開示された、従来の車輪用転がり軸受装置及びその製造方法では、種々の炭素含有量の構造炭素鋼の素材を用いて熱間鍛造にて車輪用転がり軸受装置の軸部材を成形し、成形後の焼入れ焼き戻しを種々異ならせてその影響を実験した結果が表にまとめられている。 For example, Patent Documents 1 to 3 disclose a shaft member of a wheel rolling bearing device as a hub wheel used in a wheel rolling bearing device and a method of manufacturing the shaft member of the wheel rolling bearing device.
In the manufacturing method of the shaft member 106 of the conventional rolling bearing device for wheels shown in FIGS. 6 (A) and 6 (B) disclosed in Patent Document 1, it is possible to perform side extrusion with a relatively low load by cold forging. Thus, a plurality of flange portions 107 extending radially are formed integrally with the shaft portion 105. As shown in FIG. 6A, in cold forging of the shaft member 106 of the rolling bearing device for a wheel described in Patent Document 1, (a) a solid round bar member is subjected to forward extrusion molding ( The shaft-shaped member 130a having the shape b) is formed. Then, the head portion of the shaft-shaped member 130a is headed and crushed until the outer diameter becomes approximately φD (the outer diameter of the fitting shaft portion) to form the shaft portion material 130b having the shape (c), and further, side extrusion molding is performed. The shaft member 106 of the wheel rolling bearing device having the shape (d) is formed.
In the conventional wheel rolling bearing device 201 disclosed in Patent Document 2 and shown in FIG. 6C, carbon steel having a relatively high carbon content (0.45 mass% or more and 0.75 mass% or less). As a raw material, the shaft member 206 of the rolling bearing device for the wheel is formed by cold forging after the material is softened and annealed. The inner ring raceway surface 213 in the shaft portion 205 of the shaft member 206 of the wheel rolling bearing device, the adjacent outer peripheral surface 214 (boundary portion between the shaft portion 205 and the flange portion 207), and the outer peripheral surface 210 of the inner ring fitting shaft portion are included. A hardened layer 222 is formed on the entire outer peripheral surface of the shaft portion 205 by induction hardening.
Moreover, in the conventional rolling bearing device for wheels disclosed in Patent Document 3 and the manufacturing method thereof, the shaft member of the rolling bearing device for wheels by hot forging using materials of structural carbon steel having various carbon contents. The table below summarizes the results of experiments on the effects of various molding and tempering after molding.

特開２００６−１１１０７０号公報JP 2006-111070 A 特開２００８−２２３９９０号公報JP 2008-223990 A 特開２００９−２２０７９５号公報JP 2009-22095A

特許文献１に記載された従来技術では、低荷重の冷間鍛造にて、図６（Ａ）及び（Ｂ）に示すように車輪用転がり軸受装置の軸部材１０６の軸部１０５と、フランジ部１０７と、嵌合軸部１０９とを一体に成形しているが、炭素の含有量が比較的高い構造用炭素鋼を素材とした場合では、素材の硬度が高く、フランジ部１０７における径方向の長さを所望する長さにすることは非常に困難である。また、特許文献１に開示された製造方法では、比較的軟らかい素材を用いて低荷重で冷間鍛造しているため、鍛造後の成形品において、応力が集中する内輪軌道面１１３、隣接外周面１１４（軸部１０５とフランジ部１０７との境界部）、内輪嵌合軸部の外周面１１０（図６（Ｂ）におけるクロスハッチング部分）に、焼入れ焼き戻し処理が必要となる。
また、特許文献２に記載された従来技術では、炭素の含有量が比較的高い構造用炭素鋼を素材とし、冷間鍛造の前に軟化焼鈍し処理を行ってから冷間鍛造をすることで、図６（Ｃ）に示す軸部２０５、フランジ部２０７、嵌合軸部２０９を一体的に成形しているが、成形後の焼入れを、軸部の外周面の全体に施して硬化層２２２を形成しており、この焼入れ用の設備、時間、費用がかさむ。
また、特許文献３に記載された従来技術では、構造用炭素鋼の素材を用いて熱間鍛造にて、軸部、フランジ部、嵌合軸部を一体的に成形している。熱間鍛造では素材が流動し易く低荷重で車輪用転がり軸受装置の軸部材を成形することができるが、成形品の表面粗さが冷間鍛造した場合の表面粗さよりも粗く、成形後に研削や研磨を必要とする個所が多く、研削や研磨の設備、時間、費用がかさむ。 In the prior art described in Patent Document 1, the shaft portion 105 and the flange portion of the shaft member 106 of the rolling bearing device for a wheel as shown in FIGS. 6 (A) and 6 (B) by cold forging with a low load. 107 and the fitting shaft portion 109 are integrally formed. However, when a structural carbon steel having a relatively high carbon content is used as a material, the material has high hardness, and the flange portion 107 has a radial direction. It is very difficult to obtain the desired length. In addition, in the manufacturing method disclosed in Patent Document 1, since cold forging is performed using a relatively soft material at a low load, in the molded product after forging, the inner ring raceway surface 113 on which stress is concentrated, the adjacent outer peripheral surface A quenching and tempering process is required for 114 (boundary portion between the shaft portion 105 and the flange portion 107) and the outer peripheral surface 110 of the inner ring fitting shaft portion (cross-hatched portion in FIG. 6B).
Moreover, in the prior art described in Patent Document 2, a structural carbon steel having a relatively high carbon content is used as a raw material, and after performing a soft annealing process before cold forging, cold forging is performed. 6 (C), the shaft portion 205, the flange portion 207, and the fitting shaft portion 209 are integrally formed. However, hardening after the forming is applied to the entire outer peripheral surface of the shaft portion. This makes the quenching equipment, time and money expensive.
In the prior art described in Patent Document 3, the shaft portion, the flange portion, and the fitting shaft portion are integrally formed by hot forging using a structural carbon steel material. In hot forging, the shaft member of a rolling bearing device for a wheel can be formed with low load because the material is easy to flow, but the surface roughness of the molded product is rougher than that of cold forging, and grinding after forming There are many places that require grinding and polishing, which increases the equipment, time, and cost of grinding and polishing.

本発明は、このような点に鑑みて創案されたものであり、成形後の研削や研磨を必要とする個所が熱間鍛造より比較的少ない冷間鍛造にて車輪用転がり軸受装置の軸部材を一体に成形するとともに、より高硬度の構造用炭素鋼を用いて、成形後の焼入れ焼き戻し処理をするべき個所を削減することができる車輪用転がり軸受装置の軸部材とその製造方法を提供することを課題とする。   The present invention was devised in view of such points, and the shaft member of a rolling bearing device for a wheel by cold forging in which the number of places requiring grinding and polishing after molding is relatively smaller than that of hot forging. A shaft member of a rolling bearing device for a wheel that can reduce the number of parts that should be hardened and tempered after forming using a structural carbon steel with higher hardness and a manufacturing method thereof The task is to do.

上記課題を解決するため、本発明に係る車輪用転がり軸受装置の軸部材とその製造方法は次の手段をとる。
まず、本発明の第１の発明は、外周面に内輪軌道面が形成される軸部と、前記軸部の一端側に前記軸部と同軸上に形成される嵌合軸部と、前記軸部と前記嵌合軸部との間に位置して外径方向に延出されるフランジ部と、を有する車輪用転がり軸受装置の軸部材の製造方法である。
その製造方法は、構造用炭素鋼よりなる軸状素材を焼鈍して焼鈍済軸状素材を形成する焼鈍処理工程と、前記焼鈍済軸状素材を冷間鍛造して、前記軸部と、前記嵌合軸部と、前記フランジ部と、を一体に有する冷間鍛造品を形成する冷間鍛造工程と、前記冷間鍛造品の一部を旋削して旋削済鍛造品を形成する旋削工程と、前記旋削済鍛造品の一部を熱処理して熱処理済鍛造品を形成する熱処理工程と、を有する。
そして、前記旋削済鍛造品において、前記軸部と前記フランジ部の境界部の近傍における前記軸部の外周面の一部には円周方向に連続する前記内輪軌道面が形成され、前記内輪軌道面に隣接して前記フランジ部に近い側における外周面の一部には円周方向に連続する隣接外周面が形成されており、前記軸部には、前記フランジ部に近い側に径が大きな大径軸部が形成され、前記フランジ部から遠い端部に前記大径軸部よりも小さな径の小径軸部が形成され、前記大径軸部と前記小径軸部との段差部には前記軸部の回転軸に直交する面である内輪突き当て面が形成されている。
また、前記熱処理工程では、焼入れ焼き戻し処理が行われ、前記小径軸部の外周面と前記内輪突き当て面と前記隣接外周面に前記焼入れ焼き戻し処理を行うことなく、前記内輪軌道面に前記焼入れ焼き戻し処理を行う。 In order to solve the above problems, the shaft member of the wheel rolling bearing device according to the present invention and the manufacturing method thereof take the following means.
First, the first aspect of the present invention includes a shaft portion having an inner ring raceway surface formed on an outer peripheral surface, a fitting shaft portion formed coaxially with the shaft portion on one end side of the shaft portion, and the shaft A shaft member of a rolling bearing device for a wheel having a flange portion that is positioned between a fitting portion and the fitting shaft portion and extends in an outer diameter direction.
The manufacturing method includes annealing the shaft-shaped material made of structural carbon steel to form an annealed shaft-shaped material, cold forging the annealed shaft-shaped material, and the shaft portion, A cold forging process for forming a cold forged product integrally including a fitting shaft portion and the flange portion, and a turning process for turning a part of the cold forged product to form a turned forged product; And a heat treatment step of forming a heat-treated forged product by heat-treating a part of the turned forged product.
In the turned forged product, the inner ring raceway surface that is continuous in the circumferential direction is formed on a part of the outer circumferential surface of the shaft part in the vicinity of the boundary between the shaft part and the flange part, and the inner ring raceway is formed. An adjacent outer peripheral surface that is continuous in the circumferential direction is formed in a part of the outer peripheral surface adjacent to the surface and close to the flange portion, and the shaft portion has a large diameter on the side closer to the flange portion. A large-diameter shaft portion is formed, a small-diameter shaft portion having a smaller diameter than the large-diameter shaft portion is formed at an end portion far from the flange portion, and the step portion between the large-diameter shaft portion and the small-diameter shaft portion An inner ring abutting surface that is a surface orthogonal to the rotation axis of the shaft portion is formed.
In the heat treatment step, a quenching and tempering process is performed, and the inner ring raceway surface is subjected to the quenching and tempering process without performing the quenching and tempering process on the outer peripheral surface of the small-diameter shaft portion, the inner ring abutting surface, and the adjacent outer peripheral surface. Quenching and tempering is performed.

この第１の発明によれば、焼鈍処理工程において、構造用炭素鋼よりなる軸状素材を変態点温度以上の温度で加熱して焼鈍した焼鈍済軸状素材を得ることで、材料自体の延性を向上させることができる。
そして焼鈍済軸状素材は鍛造性に優れた素材となるので、冷間鍛造工程において、鍛造回数を削減し、軸部、フランジ部、嵌合軸部とを一体に有する冷間鍛造品を容易に形成することができる。
また、熱処理工程における焼入れ焼き戻し処理を施す個所を削減し、より短時間に車輪用転がり軸受装置の軸部材を製造することができる。 According to the first aspect of the present invention, in the annealing treatment step, the shaft-shaped material made of structural carbon steel is heated at a temperature equal to or higher than the transformation point temperature to obtain an annealed shaft-shaped material, whereby the ductility of the material itself is obtained. Can be improved.
And since the annealed shaft material becomes a material excellent in forgeability, the number of forgings is reduced in the cold forging process, and a cold forging product having a shaft portion, a flange portion, and a fitting shaft portion integrally is easy. Can be formed.
Moreover, the part which performs the quenching tempering process in a heat treatment process can be reduced, and the shaft member of the rolling bearing device for wheels can be manufactured in a shorter time.

次に、本発明の第２の発明は、上記第１の発明に係る車輪用転がり軸受装置の軸部材の製造方法によって製造される車輪用転がり軸受装置の軸部材であって、前記小径軸部の外周面と前記内輪突き当て面と前記隣接外周面に焼入れ焼き戻し処理が行われることなく、前記内輪軌道面に前記焼入れ焼き戻し処理が行われている。   Next, 2nd invention of this invention is a shaft member of the rolling bearing device for wheels manufactured by the manufacturing method of the shaft member of the rolling bearing device for wheels which concerns on the said 1st invention, Comprising: Said small diameter shaft part The quenching and tempering process is performed on the inner ring raceway surface without the quenching and tempering process being performed on the outer circumferential surface, the inner ring abutting surface, and the adjacent outer circumferential surface.

この第２の発明によれば、冷間鍛造工程において、鍛造回数を削減し、軸部、フランジ部、嵌合軸部とを一体に有する冷間鍛造品を容易に形成することが可能であり、熱処理工程における焼入れ焼き戻し処理を施す個所を削減し、より短時間に製造することができる車輪用転がり軸受装置の軸部材を実現することができる。   According to the second invention, in the cold forging process, it is possible to reduce the number of forgings and easily form a cold forged product integrally having the shaft portion, the flange portion, and the fitting shaft portion. The shaft member of the rolling bearing device for a wheel that can be manufactured in a shorter time can be realized by reducing the number of places where the quenching and tempering treatment is performed in the heat treatment step.

次に、本発明の第３の発明は、上記第２の発明に係る車輪用転がり軸受装置の軸部材であって、前記内輪突き当て面は、前記小径軸部に嵌合させる円環状の内輪が突き当たる面であり、前記小径軸部に前記内輪が嵌め込まれた場合、前記小径軸部の端部がかしめられて、かしめ部と前記内輪突き当て面にて前記内輪を固定するための面であり、前記内輪突き当て面の面積は、前記焼入れ焼き戻し処理を行うことなく前記内輪を固定可能な強度を有する面積以上に設定されている。   Next, a third invention of the present invention is a shaft member of the wheel rolling bearing device according to the second invention, wherein the inner ring abutting surface is fitted into the small-diameter shaft portion. When the inner ring is fitted into the small-diameter shaft portion, the end portion of the small-diameter shaft portion is caulked, and the inner ring is fixed by the caulking portion and the inner ring abutting surface. In addition, the area of the abutting surface of the inner ring is set to be equal to or larger than an area having a strength capable of fixing the inner ring without performing the quenching and tempering process.

この第３の発明では、小径軸部の外周面と内輪突き当て面には焼入れ焼き戻し処理を行わず、内輪を嵌合してかしめ処理し、かしめ部と内輪突き当て面とで内輪を固定するが、内輪突き当て面の面積を適切なサイズとすることで、必要な強度を確保し、かしめ時における内輪突き当て面の変形を適切に防止することができる。   In this third invention, the outer ring surface of the small-diameter shaft portion and the inner ring abutting surface are not subjected to quenching and tempering, but the inner ring is fitted and caulked, and the inner ring is fixed by the caulking portion and the inner ring abutting surface. However, by setting the area of the inner ring abutting surface to an appropriate size, the required strength can be ensured, and deformation of the inner ring abutting surface during caulking can be appropriately prevented.

本発明の車輪用転がり軸受装置の軸部材の製造方法にて製造された車輪用転がり軸受装置の軸部材１が車輪用転がり軸受装置Ａとして組み付けられた状態を示す軸方向断面図である。It is an axial direction sectional view showing the state where shaft member 1 of the wheel rolling bearing device manufactured with the manufacturing method of the shaft member of the rolling bearing device for wheels of the present invention was assembled as rolling bearing device A for wheels. 図１に示す車輪用転がり軸受装置の軸部材１をＢ方向から見た図である（ハブボルト２７は図示省略）。It is the figure which looked at the shaft member 1 of the rolling bearing apparatus for wheels shown in FIG. 1 from the B direction (hub bolt 27 is abbreviate | omitting illustration). 車輪用転がり軸受装置の軸部材１の軸方向断面図である。It is an axial sectional view of the shaft member 1 of the rolling bearing device for wheels. 車輪用転がり軸受装置の軸部材１の、軸部１０、フランジ部２１、嵌合軸部３０を拡大して示す軸方向断面図である。It is an axial direction sectional view expanding and showing shaft part 10, flange part 21, and fitting shaft part 30 of shaft member 1 of a rolling bearing device for wheels. 軸状素材６０から車輪用転がり軸受装置の軸部材を成形するまでの工程（Ａ）〜（Ｈ）による素材の形状の変化等を示す図である。It is a figure which shows the change of the shape of the raw material by process (A)-(H) until it forms the shaft member of the rolling bearing apparatus for wheels from the shaft-shaped raw material 60. 従来の車輪用転がり軸受装置の軸部材の製造方法における、各工程による素材の形状の変化を示す図（Ａ）と、従来の車輪用転がり軸受装置１０１（第１例）の軸方向断面図（Ｂ）と、従来の車輪用転がり軸受装置２０１（第２例）の軸方向断面図（Ｃ）である。The figure (A) which shows the change of the shape of the raw material by each process in the manufacturing method of the shaft member of the conventional wheel rolling bearing apparatus, and the axial sectional view of the conventional wheel rolling bearing apparatus 101 (1st example) ( B) and an axial sectional view (C) of a conventional wheel rolling bearing device 201 (second example).

以下に本発明を実施するための形態を図面を用いて説明する。図１は、本発明の車輪用転がり軸受装置の軸部材の製造方法にて製造された車輪用転がり軸受装置の軸部材１が車輪用転がり軸受装置Ａとして組み付けられた状態を示す軸方向断面図を示している。   EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing. FIG. 1 is an axial sectional view showing a state in which a shaft member 1 of a wheel rolling bearing device manufactured by the method for manufacturing a shaft member of a wheel rolling bearing device of the present invention is assembled as a wheel rolling bearing device A. Is shown.

●［車輪用転がり軸受装置の全体構造（図１）］
次に図１を用いて車輪用転がり軸受装置の全体構造について説明する。
図１に示すように、車輪用転がり軸受装置Ａ（いわゆる車輪用ハブユニット）に採用される車輪用転がり軸受装置の軸部材１（いわゆるハブホイール）は、軸部１０と、嵌合軸部３０と、フランジ基部２０と、フランジ部２１とを一体に有している。
なお、車輪用転がり軸受装置Ａが車両に取り付けられた場合、軸部１０は車両内側に位置しており、嵌合軸部３０は車両外側に位置しており、図１においては紙面の左方向が車両内側を示し、紙面の右方向が車両外側を示している。 ● [Whole rolling bearing device structure (Figure 1)]
Next, the overall structure of the wheel rolling bearing device will be described with reference to FIG.
As shown in FIG. 1, a shaft member 1 (so-called hub wheel) of a wheel rolling bearing device employed in a wheel rolling bearing device A (so-called wheel hub unit) includes a shaft portion 10 and a fitting shaft portion 30. And the flange base portion 20 and the flange portion 21 are integrally provided.
When the wheel rolling bearing device A is attached to the vehicle, the shaft portion 10 is located inside the vehicle, the fitting shaft portion 30 is located outside the vehicle, and in FIG. Indicates the inside of the vehicle, and the right direction of the page indicates the outside of the vehicle.

軸部１０は略円柱形状であり、軸部１０における嵌合軸部３０と反対の側には、フランジ部２１に近い側に径が大きな大径軸部１１が形成され、フランジ部２１から遠い端部に大径軸部１１よりも小さな径の小径軸部１２が形成され、大径軸部１１と小径軸部１２との段差部には軸部１０の回転軸に直交する面である内輪突き当て面１２ａが形成されている。
フランジ基部２０は、上記の軸部１０と後述する嵌合軸部３０との間に位置しており、このフランジ基部２０の外周面に外径方向に放射状に延出された複数のフランジ部２１（図２参照）が形成されている。また複数のフランジ部２１には、車輪を締め付けるハブボルト２７が圧入によって配置されるボルト孔２４が貫設されている。
嵌合軸部３０は、軸部１０の一端側（小径軸部１２と反対の側）に、軸部１０と同軸上に、連続する略円筒形状に成形されており、車輪（図示省略）の中心孔が嵌め込まれる。
また嵌合軸部３０には、フランジ部２１側にブレーキロータ用嵌合部３１が形成され、先端側にブレーキロータ用嵌合部３１よりも若干小径の車輪用嵌合部３２が形成されている。
またフランジ部２１における嵌合軸部３０の側の面であるロータ支持面２２には、図１に示すようにブレーキロータ５５の中心孔の周囲の面が当接する。
また図３に示すように、車輪用転がり軸受装置の軸部材１は、回転軸方向に沿って、嵌合軸部３０、中間軸部２３、軸部１０、が同軸状に形成されている。なお中間軸部２３にはフランジ基部２０とフランジ部２１が含まれている。
また嵌合軸部３０の内径側には、凹状の鍛造凹部３５が形成されている。 The shaft portion 10 has a substantially cylindrical shape, and a large-diameter shaft portion 11 having a large diameter is formed on the side opposite to the fitting shaft portion 30 in the shaft portion 10, and is far from the flange portion 21. A small-diameter shaft portion 12 having a diameter smaller than that of the large-diameter shaft portion 11 is formed at the end, and an inner ring that is a surface orthogonal to the rotation axis of the shaft portion 10 is formed at the step portion between the large-diameter shaft portion 11 and the small-diameter shaft portion 12. The abutting surface 12a is formed.
The flange base portion 20 is located between the shaft portion 10 and the fitting shaft portion 30 described later, and a plurality of flange portions 21 that extend radially outward from the outer peripheral surface of the flange base portion 20. (See FIG. 2) is formed. The plurality of flange portions 21 are provided with bolt holes 24 through which hub bolts 27 for fastening the wheels are arranged by press fitting.
The fitting shaft portion 30 is formed on one end side of the shaft portion 10 (on the side opposite to the small-diameter shaft portion 12), is coaxially formed with the shaft portion 10 and is formed into a continuous, substantially cylindrical shape, and has a wheel (not shown). Center hole is fitted.
The fitting shaft portion 30 is formed with a brake rotor fitting portion 31 on the flange portion 21 side, and a wheel fitting portion 32 having a slightly smaller diameter than the brake rotor fitting portion 31 on the distal end side. Yes.
Further, as shown in FIG. 1, the surface around the center hole of the brake rotor 55 abuts on the rotor support surface 22 that is the surface of the flange portion 21 on the side of the fitting shaft portion 30.
As shown in FIG. 3, the shaft member 1 of the wheel rolling bearing device has a fitting shaft portion 30, an intermediate shaft portion 23, and a shaft portion 10 formed coaxially along the rotation axis direction. The intermediate shaft portion 23 includes a flange base portion 20 and a flange portion 21.
A concave forged concave portion 35 is formed on the inner diameter side of the fitting shaft portion 30.

図１、図３に示すように本実施の形態にて説明する車輪用転がり軸受装置の軸部材１の軸部１０の大径軸部１１におけるフランジ部２１（フランジ基部２０）との境界部の近傍における外周面の一部には、転がり軸受としての複列のアンギュラ玉軸受における一方の軸受部を構成する第１内輪軌道面１８が円周方向に連続するように形成されている。
また、第１内輪軌道面１８に隣接してフランジ部２１に近い側における外周面の一部には、円周方向に連続する後述のシール面１９（隣接外周面に相当）が形成されている。
また小径軸部１２の外周面には、円周方向に連続するように形成された第２内輪軌道面４４を外周面に有する内輪４２が嵌め込まれる。なお内輪４２は、内輪突き当て面１２ａに突き当たるまで嵌め込まれている。
そして、小径軸部１２における内輪４２からの突出部（図１中の軸端部１５）は径方向外側にかしめられて、かしめ部１７が形成され、かしめ部１７と内輪突き当て面１２ａにて内輪４２が固定されている。 As shown in FIG. 1 and FIG. 3, the boundary portion between the flange portion 21 (flange base portion 20) in the large-diameter shaft portion 11 of the shaft portion 10 of the shaft member 1 of the wheel rolling bearing device described in the present embodiment. A part of the outer peripheral surface in the vicinity is formed such that a first inner ring raceway surface 18 constituting one bearing portion of a double row angular ball bearing as a rolling bearing is continuous in the circumferential direction.
In addition, a seal surface 19 (corresponding to the adjacent outer peripheral surface) described later that is continuous in the circumferential direction is formed on a part of the outer peripheral surface adjacent to the first inner ring raceway surface 18 and close to the flange portion 21. .
Further, an inner ring 42 having a second inner ring raceway surface 44 formed so as to be continuous in the circumferential direction is fitted on the outer circumferential surface of the small-diameter shaft portion 12. The inner ring 42 is fitted until it hits the inner ring abutting surface 12a.
And the protrusion part from the inner ring | wheel 42 in the small diameter shaft part 12 (shaft end part 15 in FIG. 1) is caulked radially outward to form a caulking part 17, and the caulking part 17 and the inner ring abutting surface 12a The inner ring 42 is fixed.

車輪用転がり軸受装置の軸部材１の軸部１０の外周面には、環状空間を保って外輪４５が配置されている。
外輪４５の内周面には、車輪用転がり軸受装置の軸部材１に形成されている第１内輪軌道面１８に対向する第１外輪軌道面４６と、内輪４２に形成されている第２内輪軌道面４４に対向する第２外輪軌道面４７と、が形成されている。なお、各内輪軌道面、各外輪軌道面は、それぞれの面において円周方向に連続するように形成されている。
そして第１内輪軌道面１８と第１外輪軌道面４６との間には、複数の第１転動体５０が保持器５２によって保持されて転動可能に配置され、第２内輪軌道面４４と第２外輪軌道面４７との間には、複数の第２転動体５１が保持器５３によって保持されて転動可能に配置されている。
なお、複数の第１転動体５０、及び複数の第２転動体５１には、小径軸部１２の端部をかしめてかしめ部１７を形成した際のかしめ力に基づいて、軸方向の予圧が付与されてアンギュラ玉軸受を構成している。 An outer ring 45 is arranged on the outer peripheral surface of the shaft portion 10 of the shaft member 1 of the wheel rolling bearing device while maintaining an annular space.
On the inner peripheral surface of the outer ring 45, a first outer ring raceway surface 46 facing the first inner ring raceway surface 18 formed on the shaft member 1 of the wheel rolling bearing device, and a second inner ring formed on the inner ring 42. A second outer ring raceway surface 47 facing the raceway surface 44 is formed. Each inner ring raceway surface and each outer ring raceway surface are formed to be continuous in the circumferential direction on each surface.
Between the first inner ring raceway surface 18 and the first outer ring raceway surface 46, a plurality of first rolling elements 50 are held by a cage 52 and arranged so as to be able to roll. Between the two outer ring raceway surfaces 47, a plurality of second rolling elements 51 are held by a cage 53 and are arranged to be able to roll.
The plurality of first rolling elements 50 and the plurality of second rolling elements 51 are subjected to axial preload based on the caulking force when the caulking portion 17 is formed by caulking the end of the small diameter shaft portion 12. An angular ball bearing is provided.

また外輪４５の外周面には、車体側フランジ４８が一体に形成されており、当該車体側フランジは、車両の懸架装置（図示省略）に支持されたナックル、キャリア等の車体側部材の取付面にボルト等によって締結される。
また外輪４５における第１外輪軌道面４６に隣接する開口部の内周面には、シール部材５６が圧入されて組み付けられ、当該シール部材５６のリップ５８の先端が、シール面１９（隣接外周面に相当）に摺接（接触）して外輪４５と車輪用転がり軸受装置の軸部材１との隙間をシールしている。
なお、シール面１９は、第１内輪軌道面１８に隣接してフランジ部２１（フランジ基部２０）に近い側における外周面の一部に、円周方向に連続するように形成されている。 Further, a vehicle body side flange 48 is integrally formed on the outer peripheral surface of the outer ring 45, and the vehicle body side flange is a mounting surface of a vehicle body side member such as a knuckle or a carrier supported by a vehicle suspension device (not shown). Fastened with bolts or the like.
A seal member 56 is press-fitted and assembled to the inner peripheral surface of the opening adjacent to the first outer ring raceway surface 46 in the outer ring 45, and the tip of the lip 58 of the seal member 56 is connected to the seal surface 19 (adjacent outer peripheral surface). The gap between the outer ring 45 and the shaft member 1 of the wheel rolling bearing device is sealed.
The seal surface 19 is formed on a part of the outer peripheral surface adjacent to the first inner ring raceway surface 18 and close to the flange portion 21 (flange base portion 20) so as to be continuous in the circumferential direction.

●［車輪用転がり軸受装置の軸部材の構造と製造方法（図２〜図５）］
次に図２〜図５を用いて、車輪用転がり軸受装置の軸部材１の構造と製造方法について説明する。
図５（Ａ）〜（Ｈ）は軸状素材６０から各工程を経て車輪用転がり軸受装置の軸部材１を成形する様子を示しており、図２〜図４は、成形した車輪用転がり軸受装置の軸部材１の形状を示している。
本実施の形態にて説明する車輪用転がり軸受装置の軸部材１は、焼鈍処理工程、被膜処理工程、冷間鍛造工程、旋削工程、熱処理工程、研磨工程、を経て製造される。
まず、焼鈍処理工程に先立って、Ｓ４５Ｃ、Ｓ５０Ｃ、Ｓ５５Ｃ等の炭素量０．５％前後の略円柱形状の構造用炭素鋼を所定長さに切断して軸状素材６０を形成する（図５（Ａ）参照）。 ● [Structure and manufacturing method of shaft member of rolling bearing device for wheel (FIGS. 2 to 5)]
Next, the structure and manufacturing method of the shaft member 1 of the wheel rolling bearing device will be described with reference to FIGS.
FIGS. 5A to 5H show a state in which the shaft member 1 of the wheel rolling bearing device is formed from the shaft-shaped material 60 through each step, and FIGS. 2 to 4 show the formed wheel rolling bearing. The shape of the shaft member 1 of the apparatus is shown.
The shaft member 1 of the wheel rolling bearing device described in the present embodiment is manufactured through an annealing process, a coating process, a cold forging process, a turning process, a heat treatment process, and a polishing process.
First, prior to the annealing process, a substantially cylindrical structural carbon steel having a carbon content of about 0.5%, such as S45C, S50C, S55C, etc. is cut into a predetermined length to form a shaft-shaped material 60 (FIG. 5). (See (A)).

［１．焼鈍処理工程（図５（Ｂ））］
焼鈍処理工程において、軸状素材６０を変態点温度以上の温度（好ましくは、変態点温度よりも２０℃〜７０℃程度高い温度）で加熱する。
これによって、軸状素材６０中の炭素成分を球状化させて球状化焼鈍することで焼鈍済軸状素材６１を形成する（図５（Ｂ）参照）。この焼鈍済軸状素材６１は、これ自体の材料の延性が向上する。 [1. Annealing treatment process (FIG. 5B)]
In the annealing treatment step, the shaft-shaped material 60 is heated at a temperature equal to or higher than the transformation point temperature (preferably, a temperature higher by about 20 ° C. to 70 ° C. than the transformation point temperature).
Thereby, the carbon component in the shaft-shaped material 60 is spheroidized and spheroidized and annealed to form the annealed shaft-shaped material 61 (see FIG. 5B). This annealed shaft material 61 improves the ductility of the material itself.

［２．被膜処理工程（図５（Ｃ））］
次に被膜処理工程において、焼鈍済軸状素材６１の表面に潤滑剤を被膜処理して潤滑剤被膜３６を有する被膜処理済軸状素材６２を形成する（図５（Ｃ）参照）。
例えば、焼鈍済軸状素材６１の表面に潤滑剤としてのリン酸塩を塗布して潤滑剤被膜（リン酸塩被膜）３６を有する被膜処理済軸状素材６２を形成する。
被膜処理済軸状素材６２は、その表面の潤滑剤被膜３６によって、冷間鍛造の成形型と素材（材料）との間に生じる摩擦力を低減する。
このように、前記した焼鈍処理工程及び被膜処理工程を経た被膜処理済軸状素材６２は、冷間鍛造性に優れた素材となる。 [2. Film processing step (FIG. 5C)]
Next, in the coating processing step, the surface of the annealed shaft material 61 is coated with a lubricant to form a coated shaft material 62 having the lubricant coating 36 (see FIG. 5C).
For example, a coated shaft material 62 having a lubricant film (phosphate film) 36 is formed by applying phosphate as a lubricant to the surface of the annealed shaft material 61.
The coated shaft material 62 reduces the frictional force generated between the cold forging mold and the material (material) by the lubricant film 36 on the surface thereof.
Thus, the film-treated shaft-shaped material 62 that has been subjected to the above-described annealing treatment process and film treatment process is a material that is excellent in cold forgeability.

［３．冷間鍛造工程（図５（Ｄ）、（Ｅ））］
続く冷間鍛造工程は、１次冷間鍛造工程と２次冷間鍛造工程にて構成されている。
１次冷間鍛造工程では、冷間鍛造の前方押出し加工の鍛造型装置（図示省略）を用いて、被膜処理済軸状素材６２を前方押出し加工し、軸部１０（大径軸部１１、小径軸部１２、軸端部１５を含む）と、中間軸部（フランジ基部２０と嵌合軸部３０の一部）２３と、嵌合軸部３０の外径を形成し、冷間鍛造の前方押出し加工による１次冷間鍛造品６３を成形する（図５（Ｄ）参照）。 [3. Cold forging process (FIGS. 5D and 5E)]
The subsequent cold forging process includes a primary cold forging process and a secondary cold forging process.
In the primary cold forging step, the forged die apparatus 62 (not shown) for forward extrusion of cold forging is used to forwardly extrude the coated shaft-shaped raw material 62, and the shaft portion 10 (the large-diameter shaft portion 11, The outer diameter of the small-diameter shaft portion 12 and the shaft end portion 15), the intermediate shaft portion (a part of the flange base portion 20 and the fitting shaft portion 30) 23, and the fitting shaft portion 30 is formed, and cold forging A primary cold forging product 63 is formed by forward extrusion (see FIG. 5D).

２次冷間鍛造工程では、冷間鍛造の側方押出し加工の鍛造型装置（図示省略）を用いて、１次冷間鍛造品６３の嵌合軸部３０の中心部端面に鍛造凹部３５を形成しながら、軸部１０と嵌合軸部３０との間に位置する中間軸部２３（フランジ基部２０）の外周面に複数のフランジ部２１を放射状に成形し、２次冷間鍛造品６４を製作する（図５（Ｅ）参照）。   In the secondary cold forging step, a forged recess 35 is formed on the end face of the central portion of the fitting shaft portion 30 of the primary cold forged product 63 using a forging die device (not shown) for side extrusion of cold forging. While forming, a plurality of flange portions 21 are radially formed on the outer peripheral surface of the intermediate shaft portion 23 (flange base portion 20) located between the shaft portion 10 and the fitting shaft portion 30, and a secondary cold forging product 64 is formed. Is manufactured (see FIG. 5E).

［４．旋削工程（図５（Ｇ））］
旋削工程では、２次冷間鍛造品６４の一部、例えば、フランジ部２１の一側面のロータ支持面２２と、嵌合軸部３０の端面３３とを旋削し、フランジ部２１にボルト孔２４を孔開け加工して旋削済鍛造品６６を形成する（図５（Ｇ）参照）。
この旋削工程において、２次冷間鍛造品６４の少なくとも嵌合軸部３０の車輪用嵌合部３２（図４参照）の潤滑剤被膜３６は旋削することなく残す。
また本実施の形態では、図３、図４に示すように、フランジ部２１のロータ支持面２２の反対側の面と、第１内輪軌道面１８の肩部に隣接して形成されたシール面１９（隣接外周面に相当）と、鍛造凹部３５の表面と、軸部１０の小径軸部１２の先端の軸端部１５の端面においても潤滑剤被膜３６は旋削されることなく残される。そして、潤滑剤被膜３６を残した分だけ旋削加工範囲が小さくなり、旋削加工が容易に、且つ短時間となる。
本実施の形態の説明では、必要最小限の旋削としてロータ支持面２２と、嵌合軸部３０の端面３３とを旋削したが、これらの旋削も行わず、旋削工程を省略してもよい。 [4. Turning process (Fig. 5 (G))]
In the turning process, a part of the secondary cold forged product 64, for example, the rotor support surface 22 on one side of the flange portion 21 and the end surface 33 of the fitting shaft portion 30 are turned, and the bolt hole 24 is formed in the flange portion 21. Is drilled to form a turned forged product 66 (see FIG. 5G).
In this turning process, at least the lubricant coating 36 of the wheel fitting portion 32 (see FIG. 4) of the fitting shaft portion 30 of the secondary cold forged product 64 remains without turning.
In this embodiment, as shown in FIGS. 3 and 4, a seal surface formed adjacent to the surface of the flange portion 21 opposite to the rotor support surface 22 and the shoulder portion of the first inner ring raceway surface 18. 19 (corresponding to the adjacent outer peripheral surface), the surface of the forged recess 35, and the end face of the shaft end portion 15 at the tip of the small diameter shaft portion 12 of the shaft portion 10 are also left without being turned. Then, the turning range is reduced by the amount of the lubricant film 36 left, and the turning process is easy and takes a short time.
In the description of the present embodiment, the rotor support surface 22 and the end surface 33 of the fitting shaft portion 30 are turned as the minimum necessary turning, but these turnings are not performed and the turning step may be omitted.

［５．熱処理工程（図５（Ｈ））］
次に、熱処理工程（焼入れ焼き戻し工程）において、旋削済鍛造品６６の軸部１０の第１内輪軌道面１８を高周波焼入れした後、焼き戻しして熱処理済鍛造品６７を形成する（図５（Ｈ）参照）。この場合、シール面１９、小径軸部１２の外周面、内輪突き当て面１２ａには、あえて高周波焼入れを行わない（図３参照）。これにより、熱処理工程の時間を短縮化することができる。なお、図３に示すように、第１内輪軌道面１８の周囲には焼入れ焼き戻しによる硬化層Ｓが形成される。
本実施の形態では、比較的炭素量が多く高硬度の構造用炭素鋼を用いているので、シール面１９の周囲である軸部１０とフランジ部２１（フランジ基部２０）との境界部に高周波焼入れを行わなくても、必要な強度を確保することができる。また図１に示すように、小径軸部１２の軸端部１５をかしめたかしめ部１７と内輪突き当て面１２ａにて内輪４２を固定した際に内輪４２を固定可能な強度を有するように、内輪突き当て面１２ａの面積が設定されている（面積が大きいほうが強度が高い）。
なお、かしめを実施する際の加圧力［Ｎ］は、内輪４２と内輪突き当て面１２ａの座屈（変形）を防止するために、下記の関係式を満たすように設定することが好ましい。
加圧力［Ｎ］≦内輪突き当て面の面積［ｍｍ2］＊５００［Ｎ／ｍｍ2］ （式１） [5. Heat treatment step (FIG. 5 (H))]
Next, in the heat treatment step (quenching and tempering step), the first inner ring raceway surface 18 of the shaft portion 10 of the turned forged product 66 is induction-quenched and then tempered to form a heat-treated forged product 67 (FIG. 5). (See (H)). In this case, induction hardening is not performed on the seal surface 19, the outer peripheral surface of the small-diameter shaft portion 12, and the inner ring abutting surface 12a (see FIG. 3). Thereby, the time of a heat treatment process can be shortened. As shown in FIG. 3, a hardened layer S is formed around the first inner ring raceway surface 18 by quenching and tempering.
In the present embodiment, structural carbon steel having a relatively large amount of carbon and high hardness is used, so that a high frequency is provided at the boundary portion between the shaft portion 10 and the flange portion 21 (flange base portion 20) around the seal surface 19. The necessary strength can be ensured without quenching. Further, as shown in FIG. 1, when the inner ring 42 is fixed with the caulking portion 17 and the inner ring abutting surface 12a by caulking the shaft end 15 of the small diameter shaft portion 12, the inner ring 42 has a strength capable of fixing. The area of the inner ring abutting surface 12a is set (the larger the area, the higher the strength).
The pressure [N] at the time of caulking is preferably set to satisfy the following relational expression in order to prevent buckling (deformation) of the inner ring 42 and the inner ring abutting surface 12a.
Pressure [N] ≦ area of inner ring butting surface [mm 2 ] * 500 [N / mm 2 ] (Formula 1)

［６．研磨工程］
研磨工程では、熱処理済鍛造品６７の第１内輪軌道面１８を研磨加工して車輪用転がり軸受装置の軸部材１を形成する（図３、図４参照）。 [6. Polishing process]
In the polishing step, the first inner ring raceway surface 18 of the heat-treated forged product 67 is polished to form the shaft member 1 of the wheel rolling bearing device (see FIGS. 3 and 4).

本実施の形態にて説明した車輪用転がり軸受装置の軸部材の製造方法では、上記のように、焼鈍処理工程においてＳ４５Ｃ、Ｓ５０Ｃ、Ｓ５５Ｃ等の構造用炭素鋼を変態点温度以上の温度で加熱して焼鈍済軸状素材６１を形成し、続く被膜処理工程において焼鈍済軸状素材６１の表面に、冷間鍛造の成形型との間に生じる摩擦力を低減する潤滑剤被膜３６を施して被膜処理済軸状素材６２を形成し、鍛造性に優れた素材としている。
これによって、続く冷間鍛造工程では、１次冷間鍛造工程と２次冷間鍛造工程の２回の冷間鍛造工程によって、軸部１０、嵌合軸部３０、複数のフランジ部２１とを一体に有する冷間鍛造品（２次冷間鍛造品６４）を容易に形成することができる。 In the method of manufacturing the shaft member of the wheel rolling bearing device described in the present embodiment, as described above, structural carbon steel such as S45C, S50C, and S55C is heated at a temperature equal to or higher than the transformation point temperature in the annealing process. Then, an annealed shaft-shaped material 61 is formed, and a lubricant film 36 is applied to the surface of the annealed shaft-shaped material 61 in the subsequent coating process to reduce the frictional force generated between the cold forging mold. The film-treated shaft-shaped material 62 is formed, and the material is excellent in forgeability.
Thus, in the subsequent cold forging process, the shaft portion 10, the fitting shaft portion 30, and the plurality of flange portions 21 are formed by two cold forging steps of the primary cold forging step and the secondary cold forging step. The cold forging product (secondary cold forging product 64) that is integrally formed can be easily formed.

また、比較的高硬度の構造用炭素鋼を用いていることと、内輪突き当て面１２ａの面積を適切に設定することで、熱処理工程において軸部１０の第１内輪軌道面１８のみに熱処理を施し、シール面１９、小径軸部１２の外周面、内輪突き当て面１２ａには、あえて熱処理を施さないようにしても必要な強度を確保することができる。これにより、熱処理工程の時間を短縮化している。
また、本実施の形態にて説明した、車輪用転がり軸受装置の軸部材の製造方法によって製造された車輪用転がり軸受装置の軸部材１は、熱処理工程において第１内輪軌道面１８のみに熱処理が施されており、必要な強度を維持しているとともに、より短時間に製造されている。 In addition, heat treatment is performed only on the first inner ring raceway surface 18 of the shaft portion 10 in the heat treatment step by using relatively high hardness structural carbon steel and appropriately setting the area of the inner ring abutting surface 12a. The necessary strength can be ensured even if heat treatment is not applied to the seal surface 19, the outer peripheral surface of the small-diameter shaft portion 12, and the inner ring abutting surface 12a. Thereby, the time of the heat treatment process is shortened.
Further, the shaft member 1 of the wheel rolling bearing device manufactured by the method for manufacturing the shaft member of the wheel rolling bearing device described in the present embodiment is subjected to heat treatment only on the first inner ring raceway surface 18 in the heat treatment step. It has been applied to maintain the required strength and is manufactured in a shorter time.

本発明の車輪用転がり軸受装置の軸部材とその製造方法は、本実施の形態で説明した処理、工程等の製造方法、外観、構成、構造等に限定されず、本発明の要旨を変更しない範囲で種々の変更、追加、削除が可能である。
また、本実施の形態の説明に用いた数値は一例であり、この数値に限定されるものではない。
また、以上（≧）、以下（≦）、より大きい（＞）、未満（＜）等は、等号を含んでも含まなくてもよい。 The shaft member of the wheel rolling bearing device of the present invention and the manufacturing method thereof are not limited to the manufacturing method, process, process, etc., appearance, configuration, structure, etc. described in the present embodiment, and do not change the gist of the present invention. Various changes, additions and deletions can be made within the range.
The numerical values used in the description of the present embodiment are examples, and are not limited to these numerical values.
Further, the above (≧), the following (≦), the greater (>), the less (<), etc. may or may not include an equal sign.

１ 車輪用転がり軸受装置の軸部材
１０ 軸部
１１ 大径軸部
１２ 小径軸部
１２ａ 内輪突き当て面
１５ 軸端部
１７ かしめ部
１８ 第１内輪軌道面
１９ シール面（隣接外周面）
２０ フランジ基部
２１ フランジ部
３０ 嵌合軸部
３６ 潤滑剤被膜
４２ 内輪
４４ 第２内輪軌道面
４５ 外輪
４６ 第１外輪軌道面
４７ 第２外輪軌道面
６０ 軸状素材
６１ 焼鈍済軸状素材
６２ 被膜処理済軸状素材
６３ １次冷間鍛造品
６４ ２次冷間鍛造品
６６ 旋削済鍛造品
６７ 熱処理済鍛造品
Ａ 車輪用転がり軸受装置

DESCRIPTION OF SYMBOLS 1 Shaft member of rolling bearing apparatus for wheels 10 Shaft part 11 Large diameter shaft part 12 Small diameter shaft part 12a Inner ring abutting surface 15 Shaft end part 17 Caulking part 18 1st inner ring raceway surface 19 Seal surface (adjacent outer peripheral surface)
20 Flange base portion 21 Flange portion 30 Fitting shaft portion 36 Lubricant coating 42 Inner ring 44 Second inner ring raceway surface 45 Outer ring 46 First outer ring raceway surface 47 Second outer ring raceway surface 60 Shaft-like material 61 Annealed shaft-like material 62 Coating treatment Finished shaft material 63 Primary cold forged product 64 Secondary cold forged product 66 Turning forged product 67 Heat-treated forged product A Rolling bearing device for wheels

Claims (3)

外周面に内輪軌道面が形成される軸部と、
前記軸部の一端側に前記軸部と同軸上に形成される嵌合軸部と、
前記軸部と前記嵌合軸部との間に位置して外径方向に延出されるフランジ部と、を有する車輪用転がり軸受装置の軸部材の製造方法であって、
構造用炭素鋼よりなる軸状素材を焼鈍して焼鈍済軸状素材を形成する焼鈍処理工程と、
前記焼鈍済軸状素材を冷間鍛造して、前記軸部と、前記嵌合軸部と、前記フランジ部と、を一体に有する冷間鍛造品を形成する冷間鍛造工程と、
前記冷間鍛造品の一部を旋削して旋削済鍛造品を形成する旋削工程と、
前記旋削済鍛造品の一部を熱処理して熱処理済鍛造品を形成する熱処理工程と、を有し、
前記旋削済鍛造品において、
前記軸部と前記フランジ部の境界部の近傍における前記軸部の外周面の一部には円周方向に連続する前記内輪軌道面が形成され、前記内輪軌道面に隣接して前記フランジ部に近い側における外周面の一部には円周方向に連続する隣接外周面が形成されており、
前記軸部には、前記フランジ部に近い側に径が大きな大径軸部が形成され、前記フランジ部から遠い端部に前記大径軸部よりも小さな径の小径軸部が形成され、前記大径軸部と前記小径軸部との段差部には前記軸部の回転軸に直交する面である内輪突き当て面が形成されており、
前記熱処理工程では、
焼入れ焼き戻し処理が行われ、前記小径軸部の外周面と前記内輪突き当て面と前記隣接外周面に前記焼入れ焼き戻し処理を行うことなく、前記内輪軌道面に前記焼入れ焼き戻し処理を行う、
車輪用転がり軸受装置の軸部材の製造方法。 A shaft portion having an inner ring raceway surface formed on the outer peripheral surface;
A fitting shaft portion formed coaxially with the shaft portion on one end side of the shaft portion;
A flange portion that is positioned between the shaft portion and the fitting shaft portion and extends in an outer diameter direction, and a method of manufacturing a shaft member of a rolling bearing device for a wheel,
An annealing process for forming an annealed shaft material by annealing a shaft material made of structural carbon steel,
Cold forging the annealed shaft-shaped material, and a cold forging step of forming a cold forged product integrally including the shaft portion, the fitting shaft portion, and the flange portion;
A turning process of turning a part of the cold forged product to form a turned forged product;
A heat treatment step of heat-treating a part of the turned forged product to form a heat-treated forged product,
In the turned forged product,
The inner ring raceway surface that is continuous in the circumferential direction is formed on a part of the outer peripheral surface of the shaft portion in the vicinity of the boundary between the shaft portion and the flange portion, and the flange portion is adjacent to the inner ring raceway surface. An adjacent outer peripheral surface that is continuous in the circumferential direction is formed on a part of the outer peripheral surface on the near side,
The shaft portion is formed with a large-diameter shaft portion having a large diameter on the side close to the flange portion, and a small-diameter shaft portion having a smaller diameter than the large-diameter shaft portion is formed at an end portion far from the flange portion, An inner ring abutting surface, which is a surface orthogonal to the rotation axis of the shaft portion, is formed in the step portion between the large diameter shaft portion and the small diameter shaft portion,
In the heat treatment step,
A quenching and tempering process is performed, and the quenching and tempering process is performed on the inner ring raceway surface without performing the quenching and tempering process on the outer peripheral surface of the small-diameter shaft portion, the inner ring abutting surface, and the adjacent outer peripheral surface.
Manufacturing method of shaft member of rolling bearing device for wheel. 請求項１に記載の車輪用転がり軸受装置の軸部材の製造方法によって製造される車輪用転がり軸受装置の軸部材であって、
前記小径軸部の外周面と前記内輪突き当て面と前記隣接外周面に焼入れ焼き戻し処理が行われることなく、前記内輪軌道面に前記焼入れ焼き戻し処理が行われている、
車輪用転がり軸受装置の軸部材。 A shaft member of a wheel rolling bearing device manufactured by the method of manufacturing a shaft member of a wheel rolling bearing device according to claim 1,
The quenching and tempering process is performed on the inner ring raceway surface without performing the quenching and tempering process on the outer circumferential surface of the small-diameter shaft portion, the inner ring abutting surface, and the adjacent outer circumferential surface.
A shaft member of a rolling bearing device for wheels. 請求項２に記載の車輪用転がり軸受装置の軸部材であって、
前記内輪突き当て面は、前記小径軸部に嵌合させる円環状の内輪が突き当たる面であり、前記小径軸部に前記内輪が嵌め込まれた場合、前記小径軸部の端部がかしめられて、かしめ部と前記内輪突き当て面にて前記内輪を固定するための面であり、
前記内輪突き当て面の面積は、前記焼入れ焼き戻し処理を行うことなく前記内輪を固定可能な強度を有する面積以上に設定されている、
車輪用転がり軸受装置の軸部材。

A shaft member of the rolling bearing device for a wheel according to claim 2,
The inner ring abutting surface is a surface against which an annular inner ring fitted to the small diameter shaft portion abuts, and when the inner ring is fitted into the small diameter shaft portion, the end of the small diameter shaft portion is caulked, It is a surface for fixing the inner ring at a caulking portion and the inner ring abutment surface,
The area of the abutting surface of the inner ring is set to be equal to or more than an area having a strength capable of fixing the inner ring without performing the quenching and tempering process.
A shaft member of a rolling bearing device for wheels.

JP2011048882A 2011-03-07 2011-03-07 Shaft member of rolling bearing for wheel and method for manufacturing the same Withdrawn JP2012184813A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015041355A1 (en) * 2013-09-20 2015-03-26 Ntn株式会社 Vehicle-wheel bearing device and intermediate body, and method for producing same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015041355A1 (en) * 2013-09-20 2015-03-26 Ntn株式会社 Vehicle-wheel bearing device and intermediate body, and method for producing same
JP2015058879A (en) * 2013-09-20 2015-03-30 Ntn株式会社 Wheel bearing device, intermediate and manufacturing method thereof

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