JP2012192818A - Bearing device for wheel - Google Patents

Bearing device for wheel Download PDF

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JP2012192818A
JP2012192818A JP2011057699A JP2011057699A JP2012192818A JP 2012192818 A JP2012192818 A JP 2012192818A JP 2011057699 A JP2011057699 A JP 2011057699A JP 2011057699 A JP2011057699 A JP 2011057699A JP 2012192818 A JP2012192818 A JP 2012192818A
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Prior art keywords
wheel
hub
bearing device
recess
hub wheel
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Japanese (ja)
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Yasushi Shibata
靖史 柴田
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2011057699A priority Critical patent/JP2012192818A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • 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)
  • Rolling Contact Bearings (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight and compact bearing device for a wheel which provides the high fatigue strength of a hub wheel, and in which rigidity and durability are improved.SOLUTION: In the hub wheel 4, a bowl-shaped recess 10 is formed from a medium and high carbon steel containing 0.40 to 0.80 wt.% of C, at an end on an outer side by hot forging. A depth of the recess 10 is from an end face on an outer side of the hub wheel 4 to at least the vicinity corresponding to a position of a base 6b on an inner side of a wheel mounting flange 6. Then, thermal refining is applied beforehand, surface hardness is set to 35 HRC or lower, and compressive residual stress is imparted to the recess 10 by surface modification by shot peening.

Description

本発明は、自動車等の車輪を回転自在に支承する車輪用軸受装置、特に、軽量・コンパクト化を図りつつ、ハブ輪の疲れ強さを高め、強度・耐久性の向上を図った車輪用軸受装置に関するものである。   The present invention relates to a wheel bearing device for rotatably supporting a wheel of an automobile or the like, and more particularly, to a wheel bearing device that increases the fatigue strength of a hub wheel and improves strength and durability while reducing weight and size. It relates to the device.

従来から自動車等の車輪を支持する車輪用軸受装置は、車輪を取り付けるためのハブ輪を転がり軸受を介して回転自在に支承するもので、駆動輪用と従動輪用とがある。構造上の理由から、駆動輪用では内輪回転方式が、従動輪用では内輪回転と外輪回転の両方式が一般的に採用されている。この車輪用軸受装置には、所望の軸受剛性を有し、ミスアライメントに対しても耐久性を発揮すると共に、燃費向上の観点から回転トルクが小さい複列アンギュラ玉軸受が多用されている。この複列アンギュラ玉軸受は、固定輪と回転輪との間に複数のボールを介在させ、このボールに所定の接触角を付与して固定輪および回転輪に接触させている。   2. Description of the Related Art Conventionally, a wheel bearing device for supporting a wheel of an automobile or the like is such that a hub wheel for mounting a wheel is rotatably supported via a rolling bearing, and there are a drive wheel and a driven wheel. For structural reasons, an inner ring rotation method is generally used for driving wheels, and an inner ring rotation method and an outer ring rotation method are generally used for driven wheels. As the wheel bearing device, a double-row angular ball bearing having a desired bearing rigidity, exhibiting durability against misalignment, and having a small rotational torque from the viewpoint of improving fuel efficiency is often used. In this double row angular contact ball bearing, a plurality of balls are interposed between a fixed ring and a rotating ring, and a predetermined contact angle is given to the balls so as to contact the fixed ring and the rotating ring.

また、車輪用軸受装置には、懸架装置を構成するナックルとハブ輪との間に複列アンギュラ玉軸受等からなる車輪用軸受を嵌合させた第１世代と称される構造から、外方部材の外周に直接車体取付フランジまたは車輪取付フランジが形成された第２世代構造、また、ハブ輪の外周に一方の内側転走面が直接形成された第３世代構造、あるいは、ハブ輪と等速自在継手の外側継手部材の外周にそれぞれ内側転走面が直接形成された第４世代構造とに大別されている。   Further, the wheel bearing device has a structure called a first generation in which a wheel bearing composed of a double row angular ball bearing or the like is fitted between a knuckle and a hub wheel constituting a suspension device. Second generation structure in which body mounting flange or wheel mounting flange is formed directly on the outer periphery of the member, third generation structure in which one inner rolling surface is directly formed on the outer periphery of the hub wheel, or hub wheel, etc. It is roughly classified into a fourth generation structure in which the inner rolling surface is directly formed on the outer periphery of the outer joint member of the speed universal joint.

こうした車輪用軸受装置において、近年、省資源あるいは公害等の面から燃費向上に対する要求は厳しいものがある。自動車部品において、特に、車輪用軸受装置の軽量化はこうした要求に応える要因として注目され、強く望まれて久しい。しかし、一方、軽量化のためにハブ輪を中空構造にすることが考えられるが、この軽量化に伴い剛性の低下が生じる。すなわち、大きな荷重がかかった時にハブ輪に変形が生じ、異常振動や内側転走面の早期剥離、あるいは、ハブ輪に圧入された内輪とが相対回転する、所謂クリープが生じることがある。   In these wheel bearing devices, in recent years, there are severe demands for improving fuel efficiency in terms of resource saving or pollution. In automobile parts, in particular, weight reduction of a wheel bearing device has been attracting attention and strongly desired as a factor to meet such demands. On the other hand, it is conceivable to make the hub wheel have a hollow structure in order to reduce the weight, but the rigidity is reduced as the weight is reduced. That is, when a large load is applied, the hub wheel may be deformed, and abnormal vibration, early separation of the inner raceway surface, or so-called creep may occur in which the inner ring press-fitted into the hub wheel rotates relative to each other.

こうした問題を解決したものとして、図３に示すような車輪用軸受装置が知られている。この車輪用軸受装置は、内方部材５１と外方部材５２、および両部材５１、５２間に転動自在に収容された複列のボール５３、５３とを備えている。内方部材５１は、ハブ輪５４と、このハブ輪５４に所定のシメシロを介して圧入された内輪５５とからなる。   As a solution to such a problem, a wheel bearing device as shown in FIG. 3 is known. This wheel bearing device includes an inner member 51, an outer member 52, and double-row balls 53, 53 accommodated between the members 51, 52 so as to roll freely. The inner member 51 includes a hub ring 54 and an inner ring 55 that is press-fitted into the hub ring 54 through a predetermined shimiro.

ハブ輪５４は、一端部に車輪（図示せず）を取り付けるための車輪取付フランジ５６を一体に有し、外周に一方の内側転走面５４ａと、この内側転走面５４ａから軸方向に延びる軸状部５７を介して小径段部５４ｂが形成されている。一方、内輪５５は、外周に他方の内側転走面５５ａが形成され、ハブ輪５４の小径段部５４ｂに圧入されると共に、この小径段部５４ｂの端部を塑性変形させて形成した加締部５８によって軸方向に固定されている。   The hub wheel 54 integrally has a wheel mounting flange 56 for mounting a wheel (not shown) at one end, and has an inner rolling surface 54a on the outer periphery and an axial direction extending from the inner rolling surface 54a. A small diameter step portion 54 b is formed through the shaft-like portion 57. On the other hand, the inner ring 55 is formed by forming the other inner rolling surface 55a on the outer periphery, press-fitted into the small-diameter step portion 54b of the hub wheel 54, and forming the end portion of the small-diameter step portion 54b by plastic deformation. The portion 58 is fixed in the axial direction.

外方部材５２は、外周にナックル（図示せず）に取り付けられるための車体取付フランジ５２ｂを一体に有し、内周にハブ輪５４の内側転走面５４ａに対向する一方の外側転走面５２ａと、内輪５５の内側転走面５５ａに対向する他方の外側転走面５２ａが一体に形成されている。これら両転走面間に複列のボール５３、５３が収容され、保持器５９、５９によって転動自在に保持されている。また、外方部材５２とハブ輪５４との間の環状空間を密封するためにシール６０が装着されると共に、外方部材５２の端部内周面には、鋼鈑からプレス成形により形成された有底短円筒形状のカバー６１が装着されている。   The outer member 52 integrally has a vehicle body mounting flange 52b to be attached to a knuckle (not shown) on the outer periphery, and one outer rolling surface facing the inner rolling surface 54a of the hub wheel 54 on the inner periphery. 52a and the other outer rolling surface 52a facing the inner rolling surface 55a of the inner ring 55 are integrally formed. Double-row balls 53 and 53 are accommodated between these rolling surfaces, and are held by the cages 59 and 59 so as to be freely rollable. A seal 60 is attached to seal the annular space between the outer member 52 and the hub wheel 54, and the inner peripheral surface of the end portion of the outer member 52 is formed by pressing from a steel plate. A bottomed short cylindrical cover 61 is attached.

ここで、ハブ輪５４は、小径段部５４ｂの内輪５５の嵌合面Ａのみに対応する部分に中実構造部６２が形成され、当該部分以外は中空構造部６３とされている。すなわち、面取り部５５ｂと嵌合面Ａとの境界を通る軸方向に直交する平面上に中実構造部６２の両端面６２ａ、６２ｂが設けられ、中実構造部６２の内端側にも新たに中空構造部６３が設けられている。そして、当該中空構造部６３は、ハブ輪５４の剛性を確保できる範囲で最大限の容積を有しており、ハブ輪５４の強度・剛性を確保しつつ、軽量化を達成することができる（例えば、特許文献１参照。）。   Here, in the hub wheel 54, a solid structure portion 62 is formed in a portion corresponding only to the fitting surface A of the inner ring 55 of the small diameter step portion 54b, and the other portion is a hollow structure portion 63. That is, both end surfaces 62a and 62b of the solid structure portion 62 are provided on a plane orthogonal to the axial direction passing through the boundary between the chamfered portion 55b and the fitting surface A, and the inner end side of the solid structure portion 62 is newly provided. The hollow structure part 63 is provided in this. And the said hollow structure part 63 has the maximum volume in the range which can ensure the rigidity of the hub ring 54, and can achieve weight reduction, ensuring the intensity | strength and rigidity of the hub ring 54 ( For example, see Patent Document 1.)

特開２００７−２６９０６６号公報JP 2007-269066 A

こうした従来の車輪用軸受装置では、ハブ輪５４の中空構造部６３の容積が大きくなるにつれ軽量化を達成することができるが、ハブ輪５４の輪郭を高周波焼入れした時に生じる熱処理歪みが中空構造部６３へ引張残留応力として作用する。また、このようなハブ輪５４は、塑性加工がし易い熱間鍛造で製造されるが、中空構造部６３の容積が大きくなれば、この中空構造部６３は冷却され難くなり、表面に脱炭層（粒界酸化層）ができ易くなる。特に、中空構造部６３の奥の部位は一層冷め難いため、脱炭層が生成し易くなる。このような脱炭層が生成されると引張残留応力が発生し、回転曲げ負荷による応力振幅がこの中空構造部６３に作用した場合に、ハブ輪の中空構造部６３に亀裂が生じる等、疲労強度が著しく低下する恐れがある。   In such a conventional wheel bearing device, the weight can be reduced as the volume of the hollow structure portion 63 of the hub wheel 54 increases. However, the heat treatment distortion generated when the contour of the hub wheel 54 is induction-hardened is reduced. 63 acts as a tensile residual stress. Further, such a hub ring 54 is manufactured by hot forging which is easy to perform plastic working. However, if the volume of the hollow structure portion 63 is increased, the hollow structure portion 63 becomes difficult to be cooled, and a decarburized layer is formed on the surface. (Grain boundary oxide layer) is easily formed. In particular, since the inner part of the hollow structure portion 63 is more difficult to cool, a decarburized layer is easily generated. When such a decarburized layer is generated, a tensile residual stress is generated, and when the stress amplitude caused by the rotating bending load acts on the hollow structure portion 63, the hollow strength portion 63 of the hub ring is cracked. May decrease significantly.

本発明は、このような事情に鑑みてなされたもので、軽量・コンパクト化を図りつつ、ハブ輪の疲れ強さを高め、強度・耐久性の向上を図った車輪用軸受装置を提供することを目的としている。   The present invention has been made in view of such circumstances, and provides a wheel bearing device that increases the fatigue strength of the hub wheel and improves the strength and durability while reducing the weight and size. It is an object.

係る目的を達成すべく、本発明のうち請求項１に記載の発明は、内周に複列の外側転走面が一体に形成された外方部材と、一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に軸方向に延びる小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入され、外周に前記複列の外側転走面に対向する内側転走面が形成された少なくとも一つの内輪からなる内方部材と、この内方部材と前記外方部材の両転走面間に保持器を介して転動自在に収容された複列の転動体とを備えた車輪用軸受装置において、前記ハブ輪が熱間鍛造によって、アウター側の端部にすり鉢状の凹所が形成され、この凹所の深さが、前記ハブ輪のアウター側の端面から少なくとも前記車輪取付フランジのインナー側の基部の位置に対応する付近までとされると共に、前記凹所に表面改質で圧縮残留応力が付与されている。   In order to achieve such an object, the invention according to claim 1 of the present invention includes an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel for attaching a wheel to one end. A hub wheel integrally having a mounting flange and formed with a small-diameter step portion extending in the axial direction on the outer periphery, and an inner side that is press-fitted into the small-diameter step portion of the hub wheel and faces the outer surface of the double row on the outer periphery. An inner member composed of at least one inner ring formed with a rolling surface, and a double row rolling member accommodated between the rolling surfaces of the inner member and the outer member via a cage. In the wheel bearing device including a moving body, the hub wheel is formed by hot forging to form a mortar-like recess at an end on the outer side, and the depth of the recess is set on the outer side of the hub wheel. The vicinity corresponding to the position of the base portion on the inner side of at least the wheel mounting flange from the end face Together are in compressive residual stress is applied by surface modification to said recess.

このように、第２または３世代構造の車輪用軸受装置において、ハブ輪が熱間鍛造によって、アウター側の端部にすり鉢状の凹所が形成され、この凹所の深さが、ハブ輪のアウター側の端面から少なくとも車輪取付フランジのインナー側の基部の位置に対応する付近までとされると共に、凹所に表面改質で圧縮残留応力が付与されているので、軽量・コンパクト化を図りつつ、ハブ輪の疲労強度を増大させ、車両の旋回時に回転曲げモーメントが負荷されて繰り返し応力が作用しても、強度・耐久性の向上を図った車輪用軸受装置を提供することができる。   Thus, in the wheel bearing device of the second or third generation structure, a mortar-shaped recess is formed at the outer end by hot forging, and the depth of the recess is determined by the hub ring. From the end face on the outer side of the wheel to at least the vicinity corresponding to the position of the base part on the inner side of the wheel mounting flange, and the compressive residual stress is given to the recess by surface modification, so it is lightweight and compact On the other hand, it is possible to provide a wheel bearing device that increases the fatigue strength of the hub wheel and is improved in strength and durability even when a rotational bending moment is applied when the vehicle turns and a repeated stress acts.

また、請求項２に記載の発明のように、前記表面改質がショットピーニングによって行われていても良いし、また、請求項３に記載の発明のように、前記表面改質がＷＰＣ処理によって行われていても良い。   The surface modification may be performed by shot peening as in the invention described in claim 2, and the surface modification is performed by WPC treatment as in the invention described in claim 3. It may be done.

また、請求項４に記載の発明のように、前記ハブ輪が、外周に前記複列の外側転走面の一方に対向する内側転走面と、この内側転走面から軸状部と肩部を介して軸方向に延びる小径段部が形成され、前記凹所が、前記車輪取付フランジのインナー側の基部の位置に対応する付近からインナー側に漸次縮径するテーパ状に形成され、その先端部が円弧状に形成されて前記肩部の位置に対応する付近に止められ、当該ハブ輪のアウター側の端部の前記基部部分の肉厚と前記軸状部部分の肉厚が略等しくなるように前記凹所が所望の形状寸法に設定されていれば、軽量・コンパクト化を一層図ることができる。   According to a fourth aspect of the present invention, the hub wheel has an inner rolling surface facing one of the outer rolling surfaces of the double row on the outer periphery, and a shaft-shaped portion and a shoulder from the inner rolling surface. A small-diameter step portion extending in the axial direction is formed through the portion, and the recess is formed in a tapered shape that gradually decreases in diameter from the vicinity corresponding to the position of the base portion on the inner side of the wheel mounting flange, The tip portion is formed in an arc shape and is stopped in the vicinity corresponding to the position of the shoulder portion, and the thickness of the base portion portion at the outer end portion of the hub wheel is substantially equal to the thickness of the shaft portion portion. If the recess is set to have a desired shape and size, the weight and size can be further reduced.

また、請求項５に記載の発明のように、前記ハブ輪がＣ０．４０〜０．８０ｗｔ％を含む中高炭素鋼で形成されると共に、予め調質処理が施され、その表面硬さが３５ＨＲＣ以下に設定されていれば、組織が粒状化し、引張、曲げ、衝撃値等の機械的性質が上昇して延性や靭性が高まると共に、熱処理変形を抑制することができる。   Further, as in the invention described in claim 5, the hub wheel is made of medium and high carbon steel containing C0.40 to 0.80 wt%, and is subjected to a tempering treatment in advance, and its surface hardness is 35 HRC. If it is set below, the structure is granulated, mechanical properties such as tension, bending, and impact value are increased, ductility and toughness are increased, and heat treatment deformation can be suppressed.

本発明に係る車輪用軸受装置は、内周に複列の外側転走面が一体に形成された外方部材と、一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に軸方向に延びる小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入され、外周に前記複列の外側転走面に対向する内側転走面が形成された少なくとも一つの内輪からなる内方部材と、この内方部材と前記外方部材の両転走面間に保持器を介して転動自在に収容された複列の転動体とを備えた車輪用軸受装置において、前記ハブ輪が熱間鍛造によって、アウター側の端部にすり鉢状の凹所が形成され、この凹所の深さが、前記ハブ輪のアウター側の端面から少なくとも前記車輪取付フランジのインナー側の基部の位置に対応する付近までとされると共に、前記凹所に表面改質で圧縮残留応力が付与されているので、軽量・コンパクト化を図りつつ、ハブ輪の疲労強度を増大させ、車両の旋回時に回転曲げモーメントが負荷されて繰り返し応力が作用しても、強度・耐久性の向上を図った車輪用軸受装置を提供することができる。   The wheel bearing device according to the present invention integrally has an outer member integrally formed with a double row outer rolling surface on the inner periphery, and a wheel mounting flange for mounting the wheel on one end, and on the outer periphery. A hub wheel having a small-diameter step portion extending in the axial direction, and at least one inner rolling surface that is press-fitted into the small-diameter step portion of the hub wheel and that faces the outer rolling surface of the double row on the outer periphery. In a wheel bearing device comprising: an inner member comprising an inner ring; and a double-row rolling element that is rotatably accommodated between both rolling surfaces of the inner member and the outer member via a cage. The hub wheel is formed by hot forging to form a mortar-like recess at the outer end, and the depth of the recess is at least from the outer end surface of the hub wheel to the inner side of the wheel mounting flange. And the recess corresponding to the position corresponding to the position of the base of the Compressive residual stress is applied by surface modification, so that while reducing weight and size, increasing the fatigue strength of the hub wheel, even if a rotating bending moment is applied when the vehicle turns, repeated stress acts, It is possible to provide a wheel bearing device that is improved in strength and durability.

本発明に係る車輪用軸受装置の第１の実施形態を示す縦断面図である。It is a longitudinal section showing a 1st embodiment of a bearing device for wheels concerning the present invention. 本発明に係る車輪用軸受装置の第２の実施形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. 従来の車輪用軸受装置を示す縦断面図である。It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus.

外周にナックルに取り付けられるための車体取付フランジを一体に有し、内周に複列の外側転走面が一体に形成された外方部材と、一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に前記複列の外側転走面に対向する一方の内側転走面と、この内側転走面から軸状部を介して軸方向に延びる小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入され、外周に前記複列の外側転走面に対向する他方の内側転走面が形成された内輪からなる内方部材と、この内方部材と前記外方部材の両転走面間に保持器を介して転動自在に収容された複列の転動体と、前記外方部材と内方部材との間に形成される環状空間の両端開口部に装着されたシールとを備えた車輪用軸受装置において、前記ハブ輪がＣ０．４０〜０．８０ｗｔ％を含む中高炭素鋼から熱間鍛造によって、アウター側の端部にすり鉢状の凹所が形成され、この凹所の深さが、前記ハブ輪のアウター側の端面から少なくとも前記車輪取付フランジのインナー側の基部の位置に対応する付近までとされると共に、予め調質処理が施され、その表面硬さが３５ＨＲＣ以下に設定され、前記凹所にショットピーニングによる表面改質で圧縮残留応力が付与されている。   A vehicle body mounting flange to be attached to the knuckle on the outer periphery, an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel mounting flange to mount a wheel on one end A hub that is integrally formed with one inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and a small-diameter step portion extending in the axial direction from the inner rolling surface via the shaft-shaped portion. An inner member formed of an inner ring formed by press-fitting into a small-diameter step portion of the wheel and the hub wheel and having the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery; and the inner member Both ends of an annular space formed between the outer row member and the inner member, and a double row rolling element accommodated between the rolling surfaces of the outer member via a cage. In the wheel bearing device provided with a seal attached to the portion, the hub wheel is C0.40 to 0.8. A mortar-shaped recess is formed at the outer end by hot forging from medium-high carbon steel containing wt%, and the depth of this recess is at least the wheel mounting flange from the outer end surface of the hub wheel. In addition to the vicinity corresponding to the position of the base portion on the inner side of the inner surface, the tempering treatment is performed in advance, the surface hardness is set to 35 HRC or less, and the compressive residual stress is obtained by surface modification by shot peening in the recess. Is granted.

以下、本発明の実施の形態を図面に基づいて詳細に説明する。
図１は、本発明に係る車輪用軸受装置の第１の実施形態を示す縦断面図である。なお、以下の説明では、車両に組み付けた状態で車両の外側寄りとなる側をアウター側（図１の左側）、中央寄り側をインナー側（図１の右側）という。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device according to the present invention. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outer side (left side in FIG. 1), and the side closer to the center is referred to as the inner side (right side in FIG. 1).

この車輪用軸受装置は第３世代と呼称される従動輪用であって、内方部材１と外方部材２、および両部材１、２間に転動自在に収容された複列の転動体（ボール）３、３とを備えている。内方部材１は、ハブ輪４と、このハブ輪４に圧入された内輪５とからなる。   This wheel bearing device is for a driven wheel referred to as a third generation, and is a double row rolling element housed in a freely rollable manner between the inner member 1 and the outer member 2, and both members 1 and 2. (Balls) 3 and 3. The inner member 1 includes a hub ring 4 and an inner ring 5 press-fitted into the hub ring 4.

ハブ輪４は、一端部に車輪（図示せず）を取り付けるための車輪取付フランジ６を一体に有し、外周に一方（アウター側）の内側転走面４ａと、この内側転走面４ａから軸方向に延びる小径段部４ｂが形成されている。車輪取付フランジ６にはハブボルト６ａが周方向等配に植設されると共に、車輪取付フランジ６のインナー側の基部６ｂが所定の曲率半径からなる円弧面に形成され、後述するアウター側のシール８が摺接するシールランド部を構成している。   The hub wheel 4 integrally has a wheel mounting flange 6 for mounting a wheel (not shown) at one end, and has one (outer side) inner rolling surface 4a on the outer periphery and the inner rolling surface 4a. A small diameter step 4b extending in the axial direction is formed. Hub bolts 6a are planted on the wheel mounting flange 6 at equal intervals in the circumferential direction, and an inner side base 6b of the wheel mounting flange 6 is formed in an arc surface having a predetermined radius of curvature, and an outer side seal 8 to be described later. Constitutes a seal land portion in sliding contact.

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

ハブ輪４はＳ５３Ｃ等のＣ０．４０〜０．８０ｗｔ％を含む中高炭素鋼で形成され、内側転走面４ａをはじめ、車輪取付フランジ６のインナー側の基部６ｂから小径段部４ｂに亙って高周波焼入れによって表面硬さを５８〜６４ＨＲＣの範囲に硬化処理されている。なお、加締部４ｃは鍛造加工後の表面硬さの生のままとされている。これにより、車輪取付フランジ６に負荷される回転曲げ荷重に対して充分な機械的強度を有し、内輪５の嵌合部となる小径段部４ｂの耐クリープ性が向上すると共に、加締加工時に微小なクラック等の発生がなく加締部４ｃの塑性加工をスムーズに行うことができる。なお、内輪５および転動体３はＳＵＪ２等の高炭素クロム鋼で形成され、ズブ焼入れによって芯部まで５８〜６４ＨＲＣの範囲に硬化処理されている。   The hub wheel 4 is made of medium and high carbon steel containing C0.40 to 0.80 wt% such as S53C, and extends from the inner raceway surface 4a to the small diameter step portion 4b from the base portion 6b on the inner side of the wheel mounting flange 6. Thus, the surface hardness is set to a range of 58 to 64 HRC by induction hardening. Note that the caulking portion 4c is left with a raw surface hardness after forging. Thereby, it has sufficient mechanical strength with respect to the rotational bending load applied to the wheel mounting flange 6, and the creep resistance of the small-diameter step portion 4 b serving as the fitting portion of the inner ring 5 is improved, and caulking processing is performed. Sometimes there is no occurrence of minute cracks and the like, and the plastic working of the crimped portion 4c can be performed smoothly. The inner ring 5 and the rolling element 3 are made of high carbon chrome steel such as SUJ2, and are hardened in the range of 58 to 64 HRC to the core part by quenching.

外方部材２は、外周にナックル（図示せず）に取り付けられるための車体取付フランジ２ｂを一体に有し、内周に内方部材１の内側転走面４ａ、５ａに対向する複列の外側転走面２ａ、２ａが一体に形成されている。これら両転走面間に複列の転動体３、３が収容され、保持器７、７によって転動自在に保持されている。   The outer member 2 integrally has a vehicle body mounting flange 2b to be attached to a knuckle (not shown) on the outer periphery, and a double row of inner rows facing the inner rolling surfaces 4a and 5a of the inner member 1 on the inner periphery. The outer rolling surfaces 2a and 2a are integrally formed. Double-row rolling elements 3 and 3 are accommodated between these rolling surfaces and are held by the cages 7 and 7 so as to be freely rollable.

外方部材２はＳ５３Ｃ等のＣ０．４０〜０．８０ｗｔ％を含む中高炭素鋼で形成され、少なくとも複列の外側転走面２ａ、２ａが高周波焼入れによって表面硬さを５８〜６４ＨＲＣの範囲に硬化処理されている。そして、外方部材２と内方部材１との間に形成される環状空間の両側開口部にはシール８、９が装着され、軸受内部に封入されたグリースの外部への漏洩と、外部から雨水やダスト等が軸受内部に侵入するのを防止している。   The outer member 2 is formed of medium and high carbon steel containing C0.40 to 0.80 wt% such as S53C, and at least the double row outer rolling surfaces 2a and 2a have a surface hardness in the range of 58 to 64HRC by induction hardening. It has been cured. Seals 8 and 9 are attached to both side openings of the annular space formed between the outer member 2 and the inner member 1, and leakage of grease sealed inside the bearing to the outside and from the outside Rain water and dust are prevented from entering the bearing.

なお、本実施形態では、転動体３にボールを使用した複列アンギュラ玉軸受で構成された車輪用軸受装置を例示したが、これに限らず、例えば、転動体３に円錐ころを用いた複列円錐ころ軸受で構成されていても良い。   In the present embodiment, a wheel bearing device configured by a double row angular contact ball bearing using a ball as the rolling element 3 has been exemplified. However, the present invention is not limited to this. For example, a double bearing using a tapered roller for the rolling element 3 is exemplified. You may comprise the row tapered roller bearing.

ここで、ハブ輪４のアウター側端部にすり鉢状の凹所１０が熱間鍛造によって形成されている。この凹所１０の深さは、ハブ輪４のアウター側の端面から車輪取付フランジ６のインナー側の基部６ｂの位置に対応する付近までとされている。さらに、本実施形態では、ハブ輪４は、熱間鍛造後に、高周波誘導加熱による４００℃以上の高温焼戻しをして、トルースタイトまたはソルバイト組織にする、所謂調質処理が施されている。この調質処理により組織は粒状化し、引張、曲げ、衝撃値等の機械的性質が上昇して延性や靭性が高まる。ここでは、ハブ輪４の調質処理後の表面硬さが３５ＨＲＣ以下に設定されている。これにより、熱処理変形を抑制することができ、強度、疲れ強さを高めることができる。   Here, a mortar-shaped recess 10 is formed at the outer end of the hub wheel 4 by hot forging. The depth of the recess 10 is from the end surface on the outer side of the hub wheel 4 to the vicinity corresponding to the position of the base portion 6 b on the inner side of the wheel mounting flange 6. Furthermore, in the present embodiment, the hub wheel 4 is subjected to a so-called tempering treatment in which after hot forging, high-temperature tempering at 400 ° C. or higher by high-frequency induction heating is made into a troostite or sorbite structure. By this tempering treatment, the structure is granulated, and mechanical properties such as tension, bending, and impact value are increased, and ductility and toughness are increased. Here, the surface hardness of the hub wheel 4 after the tempering process is set to 35 HRC or less. Thereby, heat processing deformation | transformation can be suppressed and intensity | strength and fatigue strength can be raised.

そして、ハブ輪４の調質処理後、凹所１０がショットピーニングによる表面改質で圧縮残留応力が形成されている。これにより、表層の脱炭層を除去することができ、軽量・コンパクト化を図りつつ、前述した調質処理と相俟ってハブ輪４の疲労強度を増大させ、車両の旋回時に回転曲げモーメントが負荷されて繰り返し応力が作用しても、強度・耐久性の向上を図った車輪用軸受装置を提供することができる。なお、ショット粒としては数１０μｍ〜０．１ｍｍの範囲の粒径をなす鋼球が用いられるが、これ以外のセラミック等の非鉄系ショットであっても良い。   And after the refining process of the hub wheel 4, the compressive residual stress is formed in the recess 10 by the surface modification by shot peening. As a result, the decarburized layer on the surface layer can be removed, and while reducing the weight and size, the fatigue strength of the hub wheel 4 is increased in combination with the tempering treatment described above, and the rotational bending moment is reduced when the vehicle turns. Even if it is loaded and a repeated stress is applied, it is possible to provide a wheel bearing device that is improved in strength and durability. As the shot grains, steel balls having a particle diameter in the range of several tens of μm to 0.1 mm are used, but non-ferrous shots such as ceramics may be used.

本出願人がＳ５３Ｃ〜Ｓ５５Ｃからなるテストピースで実施した試験において、ショット粒や投射条件によって多少の違いがあるも、被形成面の表面硬さを５２０ＨＶ以上に設定すれば、極表層に１０００ＭＰａ程度の圧縮残留応力を形成することができることが判った。これにより熱間鍛造後、凹所１０が冷却され難くなって、その表面に引張残留応力が発生したとしても、表面に充分な圧縮残留応力を形成することができ、素材のもつ機械的強度および疲労強度を最大限に高めることができる。   In the test conducted by the present applicant with the test piece made of S53C to S55C, although there is some difference depending on shot grains and projection conditions, if the surface hardness of the surface to be formed is set to 520 HV or more, about 1000 MPa on the extreme surface layer It was found that a compressive residual stress can be formed. Thereby, after the hot forging, the recess 10 is difficult to be cooled, and even if a tensile residual stress is generated on the surface, a sufficient compressive residual stress can be formed on the surface, and the mechanical strength of the material and The fatigue strength can be maximized.

なお、このショットピーニング以外に圧縮残留応力を付与する手段としては、ショットピーニングよりさらにショット粒の粒子径を細かくし、より高速で、例えば、１００ｍ／ｓｅｃ．以上の速度で被形成面に衝突させるＷＰＣ（ｗｉｄｅ ｐｅｅｎｉｎｇ ｃｌｅａｎｉｎｇ）処理を例示することができる。このＷＰＣ処理は、高速でショット粒を被形成面に叩きつけるため、加工部極表層面では、瞬間的に金属の結晶を一度溶かす程の高温になり、その後、急冷されるため、金属結晶は微細化されて圧縮応力が生じることになる。   In addition to this shot peening, as a means for applying compressive residual stress, the particle diameter of the shot grains is made finer than shot peening, and at a higher speed, eg, 100 m / sec. A WPC (wide peening cleaning) process that collides with the surface to be formed at the above speed can be exemplified. In this WPC process, shot grains are struck against the surface to be formed at a high speed. Therefore, the surface of the processed part is heated to a high temperature so that the metal crystals are melted once, and then rapidly cooled, so that the metal crystals are fine. And compressive stress is generated.

図２は、本発明に係る車輪用軸受装置の第２の実施形態を示す縦断面図である。なお、この実施形態は、前述した第１の実施形態（図１）と基本的にはハブ輪の材質と凹所の形状が異なるだけで、その他同一の部位、同一の部品、あるいは同一の機能を有する部品や部位には同じ符号を付けてその詳細な説明を省略する。   FIG. 2 is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention. This embodiment is basically different from the first embodiment (FIG. 1) described above except that the material of the hub wheel and the shape of the recess are different, and the other parts are the same, the same parts, or the same function. Parts and parts having the same reference numerals are given the same reference numerals, and detailed description thereof is omitted.

この車輪用軸受装置は第３世代と呼称される従動輪用であって、内方部材１１と外方部材２、および両部材１１、２間に転動自在に収容された複列の転動体３、３とを備えている。内方部材１１は、ハブ輪１２と、このハブ輪１２に所定のシメシロを介して圧入された内輪５とからなる。   This wheel bearing device is for a driven wheel referred to as a third generation, and is a double row rolling element housed in a freely rollable manner between the inner member 11, the outer member 2, and both members 11,2. 3 and 3. The inner member 11 includes a hub ring 12 and an inner ring 5 that is press-fitted into the hub ring 12 through a predetermined shimiro.

ハブ輪１２は、一端部に車輪取付フランジ６を一体に有し、外周に一方（アウター側）の内側転走面４ａと、この内側転走面４ａから軸状部１３と肩部４ｄを介して軸方向に延びる小径段部４ｂが形成されている。そして、内輪５がこのハブ輪１２の小径段部４ｂに所定のシメシロを介して圧入され、加締部４ｃによって所定の軸受予圧が付与された状態で、軸方向に固定されている。   The hub wheel 12 has a wheel mounting flange 6 integrally at one end, one (outer side) inner rolling surface 4a on the outer periphery, and the shaft-like portion 13 and the shoulder 4d from the inner rolling surface 4a. A small-diameter step portion 4b extending in the axial direction is formed. The inner ring 5 is press-fitted into the small-diameter step portion 4b of the hub wheel 12 through a predetermined shimiro, and is fixed in the axial direction with a predetermined bearing preload applied by the crimping portion 4c.

ハブ輪１２はＳＵＪ２等のＣ０．９０〜１．３０ｗｔ％を含む軸受鋼で形成され、内側転走面４ａをはじめ、車輪取付フランジ６のインナー側の基部６ｂから小径段部４ｂに亙って高周波焼入れによって表面硬さを５８〜６４ＨＲＣの範囲に硬化処理されている。   The hub wheel 12 is made of bearing steel containing C0.90 to 1.30 wt% such as SUJ2, and extends from the inner rolling surface 4a to the base portion 6b on the inner side of the wheel mounting flange 6 to the small diameter step portion 4b. The surface hardness is set to a range of 58 to 64 HRC by induction hardening.

また、内輪５の外径には車輪の回転速度を検出するための磁気エンコーダ１４が固定されると共に、外方部材２の開口端部を覆うキャップ（図示せず）が装着されている。このキャップとアウター側のシール８によって、軸受内部に封入されたグリースの外部への漏洩と、外部から雨水やダスト等が軸受内部に侵入するのを防止している。   A magnetic encoder 14 for detecting the rotational speed of the wheel is fixed to the outer diameter of the inner ring 5 and a cap (not shown) that covers the open end of the outer member 2 is attached. The cap and the outer seal 8 prevent leakage of grease sealed inside the bearing and intrusion of rainwater, dust and the like from the outside into the bearing.

本実施形態では、ハブ輪１２のアウター側の端部にすり鉢状の凹所１５が熱間鍛造によって形成されている。この凹所１５は、車輪取付フランジ６のインナー側の基部６ｂの位置に対応する付近からインナー側に漸次縮径するテーパ状に形成されると共に、その先端部が円弧状に形成され、肩部４ｄの位置に対応する付近に止められている。そして、ハブ輪１２のアウター側の端部、すなわち、基部６ｂ部分の肉厚Ｌ０と軸状部１３部分の肉厚Ｌ１が略等しくなるように凹所１５が所望の形状寸法に設定されている。   In this embodiment, a mortar-shaped recess 15 is formed at the outer end of the hub wheel 12 by hot forging. The recess 15 is formed in a tapered shape that gradually decreases in diameter from the vicinity corresponding to the position of the base portion 6b on the inner side of the wheel mounting flange 6 and has a tip portion formed in an arc shape, and a shoulder portion. It is stopped in the vicinity corresponding to the position 4d. The recess 15 is set to a desired shape and dimension so that the outer side end of the hub wheel 12, that is, the thickness L0 of the base 6b portion and the thickness L1 of the shaft-like portion 13 are substantially equal. .

そして、ハブ輪１２の熱処理後、凹所１５がショットピーニングによる表面改質で圧縮残留応力が形成されている。これにより、表層の脱炭層を除去することができ、軽量・コンパクト化を一層図りつつ、ハブ輪１２の疲労強度を増大させ、強度・耐久性の向上を図ることができる。   After the heat treatment of the hub wheel 12, the recess 15 is subjected to surface modification by shot peening to form a compressive residual stress. Thereby, the decarburized layer on the surface layer can be removed, and the fatigue strength of the hub wheel 12 can be increased and the strength and durability can be improved while further reducing the weight and size.

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。   The embodiment of the present invention has been described above, but the present invention is not limited to such an embodiment, and is merely an example, and various modifications can be made without departing from the scope of the present invention. Of course, the scope of the present invention is indicated by the description of the scope of claims, and further, the equivalent meanings described in the scope of claims and all modifications within the scope of the scope of the present invention are included. Including.

本発明に係る車輪用軸受装置は、ハブ輪が熱間鍛造によって形成され、その端部に軽量化のための凹所が形成された従動輪側の車輪用軸受装置に適用することができる。   The wheel bearing device according to the present invention can be applied to a wheel bearing device on the side of a driven wheel in which a hub wheel is formed by hot forging and a recess for lightening is formed at an end thereof.

１、１１ 内方部材
２ 外方部材
２ａ 外側転走面
２ｂ 車体取付フランジ
３ 転動体
４、１２ ハブ輪
４ａ、５ａ 内側転走面
４ｂ 小径段部
４ｃ 加締部
４ｄ 肩部
５ 内輪
６ 車輪取付フランジ
６ａ ハブボルト
６ｂ 車輪取付フランジのインナー側の基部
７ 保持器
８ アウター側のシール
９ インナー側のシール
１０、１５ 凹所
１３ 軸状部
１４ 磁気エンコーダ
５１ 内方部材
５２ 外方部材
５２ａ 外側転走面
５２ｂ 車体取付フランジ
５３ ボール
５４ ハブ輪
５４ａ、５５ａ 内側転走面
５４ｂ 小径段部
５５ 内輪
５５ｂ 面取り部
５６ 車輪取付フランジ
５７ 軸状部
５８ 加締部
５９ 保持器
６０ シール
６１ カバー
６２ 中実構造部
６２ａ、６２ｂ 中実構造部の端面
６３ 中空構造部
Ａ 嵌合面
Ｌ０ 基部部分の最小肉厚
Ｌ１ 軸状部の最小肉厚 DESCRIPTION OF SYMBOLS 1, 11 Inner member 2 Outer member 2a Outer rolling surface 2b Car body mounting flange 3 Rolling elements 4, 12 Hub wheel 4a, 5a Inner rolling surface 4b Small diameter step portion 4c Clamping portion 4d Shoulder portion 5 Inner ring 6 Wheel mounting Flange 6a Hub bolt 6b Inner side base 7 of wheel mounting flange Cage 8 Outer side seal 9 Inner side seal 10, 15 Recess 13 Shaft 14 Magnetic encoder 51 Inner member 52 Outer member 52a Outer rolling surface 52b Car body mounting flange 53 Ball 54 Hub wheels 54a, 55a Inner rolling surface 54b Small-diameter stepped portion 55 Inner ring 55b Chamfered portion 56 Wheel mounting flange 57 Shaft portion 58 Caulking portion 59 Cage 60 Seal 61 Cover 62 Solid structure portion 62a 62b Solid structure part end face 63 Hollow structure part A Fitting surface L0 Minimum thickness L1 of base part Minimum thickness of shaft part

Claims (5)

内周に複列の外側転走面が一体に形成された外方部材と、
一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に軸方向に延びる小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入され、外周に前記複列の外側転走面に対向する内側転走面が形成された少なくとも一つの内輪からなる内方部材と、
この内方部材と前記外方部材の両転走面間に保持器を介して転動自在に収容された複列の転動体とを備えた車輪用軸受装置において、
前記ハブ輪が熱間鍛造によって、アウター側の端部にすり鉢状の凹所が形成され、この凹所の深さが、前記ハブ輪のアウター側の端面から少なくとも前記車輪取付フランジのインナー側の基部の位置に対応する付近までとされると共に、前記凹所に表面改質で圧縮残留応力が付与されていることを特徴とする車輪用軸受装置。 An outer member in which a double row outer rolling surface is integrally formed on the inner periphery;
A hub wheel integrally having a wheel mounting flange for mounting a wheel at one end, a small diameter step portion extending in the axial direction on the outer periphery, and a small diameter step portion of the hub wheel are press-fitted, and the double row is disposed on the outer periphery. An inner member composed of at least one inner ring formed with an inner rolling surface facing the outer rolling surface of
In a wheel bearing device comprising a double-row rolling element that is accommodated so as to roll freely between both rolling surfaces of the inner member and the outer member via a cage,
The hub wheel is hot-forged to form a mortar-shaped recess at the outer end, and the depth of the recess is at least from the end surface on the outer side of the hub wheel to the inner side of the wheel mounting flange. A bearing device for a wheel, characterized in that a compressive residual stress is applied to the recess by surface modification while being close to the position corresponding to the position of the base. 前記ハブ輪が、外周に前記複列の外側転走面の一方に対向する内側転走面と、この内側転走面から軸状部と肩部を介して軸方向に延びる小径段部が形成され、前記凹所が、前記車輪取付フランジのインナー側の基部の位置に対応する付近からインナー側に漸次縮径するテーパ状に形成され、その先端部が円弧状に形成されて前記肩部の位置に対応する付近に止められ、当該ハブ輪のアウター側の端部の前記基部部分の肉厚と前記軸状部部分の肉厚が略等しくなるように前記凹所が所望の形状寸法に設定されている請求項１に記載の車輪用軸受装置。   The hub wheel is formed with an inner rolling surface facing one of the double row outer rolling surfaces on the outer periphery, and a small-diameter step portion extending in the axial direction from the inner rolling surface via a shaft portion and a shoulder portion. The recess is formed in a tapered shape that gradually decreases in diameter from the vicinity corresponding to the position of the base portion on the inner side of the wheel mounting flange, and the tip portion thereof is formed in an arc shape so that the shoulder portion The recess is set to a desired shape and dimension so that the thickness of the base portion of the outer end of the hub wheel is substantially equal to the thickness of the shaft portion. The wheel bearing device according to claim 1, wherein 前記ハブ輪がＣ０．４０〜０．８０ｗｔ％を含む中高炭素鋼で形成されると共に、予め調質処理が施され、その表面硬さが３５ＨＲＣ以下に設定されている請求項１または２に記載の車輪用軸受装置。   The hub ring is made of medium and high carbon steel containing C0.40 to 0.80 wt%, tempered in advance, and its surface hardness is set to 35 HRC or less. Wheel bearing device. 前記表面改質がショットピーニングによって行われている請求項１に記載の車輪用軸受装置。   The wheel bearing device according to claim 1, wherein the surface modification is performed by shot peening. 前記表面改質がＷＰＣ処理によって行われている請求項１に記載の車輪用軸受装置。   The wheel bearing device according to claim 1, wherein the surface modification is performed by a WPC process.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015199081A (en) * 2014-04-07 2015-11-12 日本精工株式会社 Manufacturing method for metal member having external flange part
CN111981034A (en) * 2019-05-24 2020-11-24 斯凯孚公司 Wheel hub bearing with radial reinforcement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015199081A (en) * 2014-04-07 2015-11-12 日本精工株式会社 Manufacturing method for metal member having external flange part
CN111981034A (en) * 2019-05-24 2020-11-24 斯凯孚公司 Wheel hub bearing with radial reinforcement

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