JP2007127242A - Wheel bearing device - Google Patents

Wheel bearing device Download PDF

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JP2007127242A
JP2007127242A JP2005322322A JP2005322322A JP2007127242A JP 2007127242 A JP2007127242 A JP 2007127242A JP 2005322322 A JP2005322322 A JP 2005322322A JP 2005322322 A JP2005322322 A JP 2005322322A JP 2007127242 A JP2007127242 A JP 2007127242A
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inner ring
wheel
annular groove
bearing device
curvature
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JP4462629B2 (en
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Kazuo Komori
和雄 小森
Takayuki Kowada
貴之 小和田
Yasuhiro Aritake
恭大 有竹
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel bearing device with improved strength or durability, suppressing the deformation of an inner ring which is caulked and fixed to a hub ring. <P>SOLUTION: In the wheel bearing device, the inner ring 3 is press-fitted in a small-diameter step part 2b of the hub ring 2, and the inner ring 3 is axially fixed by a caulking part 2c which is formed by plastic deformation of an end part of the small diameter step part 2b racially outward. The end part of the small-diameter step part 2b of the hub ring 2 is a hollow cylindrical part 12, an annular groove 13 whose depth b is set to be within a range of 0.5 to 1.0 mm is formed in an outer peripheral face of the cylindrical part 12. The annular groove 13 is overlapped with a chamfered part 3b of the inner ring 3 on its inner side, and is set to be within a range closer to the inner side than an inner rolling face 3a of the inner ring 3 on its outer side. Circular arc faces 13a, 13b of predetermined curvature radiuses Ri, Ro are formed on both sides of the annular groove 13, and the curvature radiuses Ri, Ro satisfy Ri≤Ro within a range of R1 to R10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、自動車等の車輪を懸架装置に対して回転自在に支承する車輪用軸受装置、特に、ハブ輪に加締固定される内輪の耐久性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 that rotatably supports a wheel of an automobile or the like with respect to a suspension device, and more particularly to a wheel bearing device that improves durability of an inner ring that is crimped and fixed to a hub wheel. .

自動車等の車両の車輪用軸受装置には、駆動輪用のものと従動輪用のものとがある。特に、自動車の懸架装置に対して車輪を回転自在に支承する車輪用軸受装置は、低コスト化は言うまでもなく、燃費向上のための軽量・コンパクト化が進んでいる。その従来構造の代表的な一例として、図４に示すような従動輪用の車輪用軸受装置が知られている。   2. Description of the Related Art Wheel bearing devices for vehicles such as automobiles include those for driving wheels and those for driven wheels. In particular, a wheel bearing device that rotatably supports a wheel with respect to a suspension device of an automobile has been made lighter and more compact for improving fuel efficiency, not to mention cost reduction. As a typical example of the conventional structure, a wheel bearing device for a driven wheel as shown in FIG. 4 is known.

この車輪用軸受装置は第３世代と称され、内方部材５１と外方部材６０、および両部材５１、６０間に転動自在に収容された複列のボール５５、５５とを備えている。内方部材５１は、ハブ輪５２と、このハブ輪５２に所定のシメシロを介して圧入された内輪５３とからなる。   This wheel bearing device is referred to as a third generation, and includes an inner member 51, an outer member 60, and double-row balls 55, 55 accommodated between the members 51, 60 so as to roll freely. . The inner member 51 includes a hub ring 52 and an inner ring 53 press-fitted into the hub ring 52 through a predetermined shimoshiro.

ハブ輪５２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５４を一体に有し、外周には内側転走面５２ａと、この内側転走面５２ａから軸方向に延びる小径段部５２ｂが形成されている。そして、外周に内側転走面５３ａが形成された内輪５３が小径段部５２ｂに圧入され、さらに、小径段部５２ｂの端部を径方向外方に塑性変形させて形成した加締部５２ｃにより、ハブ輪５２に対して内輪５３が軸方向固定されている。   The hub wheel 52 integrally has a wheel mounting flange 54 for mounting a wheel (not shown) at one end, an inner rolling surface 52a on the outer periphery, and a small diameter extending in the axial direction from the inner rolling surface 52a. A stepped portion 52b is formed. An inner ring 53 having an inner raceway surface 53a formed on the outer periphery is press-fitted into the small-diameter stepped portion 52b, and further, an end portion of the small-diameter stepped portion 52b is plastically deformed outward in the radial direction. The inner ring 53 is fixed to the hub ring 52 in the axial direction.

外方部材６０は、外周に車体（図示せず）に取り付けるための車体取付フランジ６０ｂを一体に有し、内周に複列の外側転走面６０ａ、６０ａが形成されている。そして、それぞれの転走面６０ａ、５２ａと６０ａ、５３ａ間に複列のボール５５、５５が収容され、保持器５６、５６によりこれら複列のボール５５、５５が転動自在に保持されている。また、外方部材６０の端部にはシール５７、５８が装着され、軸受内部に封入された潤滑グリースの漏洩と、外部から雨水やダスト等が軸受内部に侵入するのを防止している。   The outer member 60 integrally has a vehicle body mounting flange 60b for mounting to the vehicle body (not shown) on the outer periphery, and double row outer rolling surfaces 60a, 60a are formed on the inner periphery. The double rows of balls 55 and 55 are accommodated between the respective rolling surfaces 60a and 52a and 60a and 53a, and the double rows of balls 55 and 55 are held by the cages 56 and 56 so as to freely roll. . Further, seals 57 and 58 are attached to the end portion of the outer member 60 to prevent leakage of lubricating grease sealed inside the bearing and intrusion of rainwater, dust and the like from the outside into the bearing.

ここで、加締前におけるハブ輪５２の小径段部５２ｂは、図５に示すように、中空状の円筒部７０として形成されている。この円筒部７０は所定の軸方向深さｄ１を有し、円筒部７０の先端部肉厚Ｄ２が、根元部の肉厚Ｄ１よりも大きくなるよう先端に向って漸増する形状に形成されている。これにより、加締加工の初期にポンチ等の加締治具によって押し広げられる肉量が多くなるため、ハブ輪５２の円筒部７０を塑性変形させる軸方向寸法が短くて済むと共に、加締治具形状に早期に充足し易く、内輪５３を強固に固定することができる。   Here, the small-diameter step portion 52b of the hub wheel 52 before caulking is formed as a hollow cylindrical portion 70 as shown in FIG. The cylindrical portion 70 has a predetermined axial depth d1, and is formed in a shape that gradually increases toward the distal end so that the distal end thickness D2 of the cylindrical portion 70 is larger than the thickness D1 of the root portion. . As a result, the amount of the wall that is pushed and expanded by a clamping jig such as a punch increases in the initial stage of the crimping process, so that the axial dimension for plastic deformation of the cylindrical portion 70 of the hub wheel 52 can be shortened, and the crimping process can be performed. It is easy to satisfy the tool shape at an early stage, and the inner ring 53 can be firmly fixed.

また、内輪５３の内径端部に、曲率半径ｒ１が１〜２．５ｍｍの円弧形状からなる面取り部５３ｂが形成されると共に、円筒部７０の外周面に深さｎが０．５ｍｍ程度、曲率半径ｒ２が５〜１０ｍｍ程度の環状溝７１が、内輪５３の面取り部５３ｂにかかるように形成されている。これにより、ハブ輪５２の円筒部７０を加締めても、内輪５３の変形を最小限に抑えることができると共に、加締加工時の亀裂等の損傷を防止することができる。
特開２００２−１３９０６０号公報 A chamfered portion 53b having an arc shape with a radius of curvature r1 of 1 to 2.5 mm is formed at the inner diameter end of the inner ring 53, and a depth n is about 0.5 mm on the outer peripheral surface of the cylindrical portion 70. An annular groove 71 having a radius r2 of about 5 to 10 mm is formed so as to cover the chamfered portion 53 b of the inner ring 53. As a result, even when the cylindrical portion 70 of the hub wheel 52 is crimped, the deformation of the inner ring 53 can be minimized, and damage such as cracks during the crimping process can be prevented.
JP 2002-139060 A

このような従来の車輪用軸受装置では、ハブ輪５２において、加締前の小径段部５２ｂの円筒部７０が、先端に向って漸増する形状に形成されると共に、円筒部７０の外周面に環状溝、所謂アンダーカットが、内輪５３の面取り部５３ｂにかかるように形成されているので、加締加工による内輪５３の変形を最小限に抑えることができ、外径に発生するフープ応力を抑制することができる特徴を備えている。然しながら、このフープ応力は内輪押込み量（加締量）と相関関係があり、内輪押込み量が大きくなるとフープ応力が増加する傾向にある。したがって、内輪割れ等に繋がる過大フープ応力、例えば、２５０ＭＰａ以上のフープ応力の発生を防止するためには、内輪押込み量を小さくする必要があるが、単にこの内輪押込み量を小さくするだけでは内輪押込み量が不足して内輪５３の固定力を確保することができないため、フープ応力を抑えると共に、適切な内輪押込み量が得られる手法等が求められていた。   In such a conventional wheel bearing device, in the hub wheel 52, the cylindrical portion 70 of the small-diameter stepped portion 52b before caulking is formed in a shape that gradually increases toward the tip, and on the outer peripheral surface of the cylindrical portion 70. Since the annular groove, so-called undercut, is formed so as to be applied to the chamfered portion 53b of the inner ring 53, deformation of the inner ring 53 due to crimping can be minimized, and hoop stress generated in the outer diameter is suppressed. Features that can be done. However, the hoop stress has a correlation with the inner ring pushing amount (clamping amount), and the hoop stress tends to increase as the inner ring pushing amount increases. Therefore, in order to prevent the occurrence of excessive hoop stress that leads to cracking of the inner ring, for example, hoop stress of 250 MPa or more, it is necessary to reduce the inner ring pushing amount, but simply reducing the inner ring pushing amount reduces the inner ring pushing amount. Since the amount is insufficient and the fixing force of the inner ring 53 cannot be secured, there has been a demand for a method for suppressing the hoop stress and obtaining an appropriate inner ring pushing amount.

本発明は、このような従来の問題に鑑みてなされたもので、ハブ輪に加締固定される内輪の変形を抑制すると共に、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する。   The present invention has been made in view of such conventional problems, and provides a wheel bearing device that suppresses deformation of an inner ring that is caulked and fixed to a hub ring and that is improved in strength and durability. For the purpose.

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形成された外方部材と、一端部に車輪取付フランジを一体に有し、この車輪取付フランジから軸方向に延びる小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入された少なくとも一つの内輪からなり、外周に前記複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、この内方部材と前記外方部材の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、前記小径段部の端部を径方向外方に塑性変形させて形成した加締部により前記内輪が軸方向に固定された車輪用軸受装置において、前記内輪の内径面と加締側端面とを繋ぐ面取り部が所定の曲率半径ｒ１からなる円弧面を有し、前記ハブ輪における小径段部の端部が中空状の円筒部として形成され、この円筒部の外周面に所定の深さの環状溝が形成されると共に、この環状溝が、インナー側は前記内輪の面取り部にかかり、アウター側は前記内輪の内側転走面よりインナー側の範囲に設定され、両側に所定の曲率半径Ｒｉ、Ｒｏからなる円弧面が形成され、これら円弧面の曲率半径がＲｉ≦Ｒｏとなるように設定されている。   In order to achieve such an object, the invention according to claim 1 of the present invention integrally has an outer member having a double row outer rolling surface formed on the inner periphery and a wheel mounting flange at one end. A hub wheel formed with a small-diameter step portion extending in the axial direction from the wheel mounting flange, and at least one inner ring press-fitted into the small-diameter step portion of the hub wheel, and the outer circumferential surface of the double row on the outer periphery. An inward member formed with opposing double-row inner rolling surfaces, and a double-row rolling member accommodated between the rolling surfaces of the inner member and the outer member via a cage. In a wheel bearing device in which the inner ring is fixed in the axial direction by a caulking portion formed by plastically deforming an end portion of the small-diameter stepped portion radially outwardly, the inner diameter surface of the inner ring is added to the inner surface of the inner ring. The chamfered portion connecting the tightening side end surface has an arc surface having a predetermined radius of curvature r1, and the hub wheel has The end portion of the small diameter step portion is formed as a hollow cylindrical portion, and an annular groove having a predetermined depth is formed on the outer peripheral surface of the cylindrical portion, and this annular groove is a chamfered portion of the inner ring on the inner side. The outer side is set in a range closer to the inner side than the inner raceway surface of the inner ring, and arc surfaces having predetermined curvature radii Ri and Ro are formed on both sides, and the curvature radii of these arc surfaces are Ri ≦ Ro. It is set to be.

このように、ハブ輪の小径段部に内輪が圧入され、小径段部の端部を径方向外方に塑性変形させて形成した加締部により、ハブ輪に対して内輪を軸方向に固定した、所謂セルフリテイン構造の車輪用軸受装置において、内輪の内径面と加締側端面とを繋ぐ面取り部が所定の曲率半径ｒ１からなる円弧面を有し、ハブ輪における小径段部の端部が中空状の円筒部として形成され、この円筒部の外周面に所定の深さの環状溝が形成されると共に、この環状溝が、インナー側は内輪の面取り部にかかり、アウター側は内輪の内側転走面よりインナー側の範囲に設定され、両側に所定の曲率半径Ｒｉ、Ｒｏからなる円弧面が形成され、これら円弧面の曲率半径がＲｉ≦Ｒｏとなるように設定されているので、加締加工時に円筒部が変形し易くなり、加締加工による内輪の変形を抑制すると共に、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。   In this way, the inner ring is fixed to the hub ring in the axial direction by the caulking portion formed by press-fitting the inner ring into the small-diameter step portion of the hub wheel and plastically deforming the end of the small-diameter step portion radially outward. In the so-called self-retained wheel bearing device, the chamfered portion connecting the inner diameter surface of the inner ring and the crimping side end surface has an arc surface having a predetermined radius of curvature r1, and the end portion of the small-diameter step portion of the hub wheel. Is formed as a hollow cylindrical portion, and an annular groove having a predetermined depth is formed on the outer peripheral surface of the cylindrical portion. The annular groove is applied to the chamfered portion of the inner ring on the inner side, and the outer side is formed on the inner ring. Since it is set in the range on the inner side from the inner rolling surface, and arc surfaces having predetermined curvature radii Ri and Ro are formed on both sides, the curvature radii of these arc surfaces are set so that Ri ≦ Ro, The cylindrical part is easily deformed during caulking. Suppresses the inner ring of the deformation due to processing, it is possible to provide a wheel bearing apparatus with improved strength and durability.

また、請求項２に記載の発明のように、前記環状溝におけるインナー側の円弧面の曲率半径Ｒｉが、前記内輪の面取り部の曲率半径ｒ１よりも大きく、ｒ１≦Ｒｉとなるように設定されていれば、加締加工による亀裂等の損傷を防止すると共に、内輪の変形を抑制することができる。   Further, as in the second aspect of the invention, the radius of curvature Ri of the inner circular arc surface in the annular groove is set to be larger than the radius of curvature r1 of the chamfered portion of the inner ring, and r1 ≦ Ri. If so, it is possible to prevent damage such as cracks due to caulking, and to suppress deformation of the inner ring.

また、請求項３に記載の発明のように、前記環状溝の深さが０．５〜１．０ｍｍの範囲に設定されていれば、円筒部が変形し易くなると共に、所定の内輪固定力を確保することができる。   If the depth of the annular groove is set in a range of 0.5 to 1.0 mm as in the invention described in claim 3, the cylindrical portion is easily deformed and a predetermined inner ring fixing force is obtained. Can be secured.

また、請求項４に記載の発明のように、前記環状溝における円弧面の曲率半径Ｒｉ、ＲｏがＲ１〜Ｒ１０の範囲に設定されていれば、加締加工によって生じる内輪のフープ応力を２５０ＭＰａ以下に抑えることができ、内輪の割れ等の損傷を防止することができる。   Further, as in the invention according to claim 4, if the curvature radii Ri and Ro of the circular arc surface in the annular groove are set in the range of R1 to R10, the hoop stress of the inner ring caused by caulking is 250 MPa or less. Damage to the inner ring can be prevented.

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形成された外方部材と、一端部に車輪取付フランジを一体に有し、この車輪取付フランジから軸方向に延びる小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入された少なくとも一つの内輪からなり、外周に前記複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、この内方部材と前記外方部材の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、前記小径段部の端部を径方向外方に塑性変形させて形成した加締部により前記内輪が軸方向に固定された車輪用軸受装置において、前記内輪の内径面と加締側端面とを繋ぐ面取り部が所定の曲率半径ｒ１からなる円弧面を有し、前記ハブ輪における小径段部の端部が中空状の円筒部として形成され、この円筒部の外周面に所定の深さの環状溝が形成されると共に、この環状溝が、インナー側は前記内輪の面取り部にかかり、アウター側は前記内輪の内側転走面よりインナー側の範囲に設定され、両側に所定の曲率半径Ｒｉ、Ｒｏからなる円弧面が形成され、これら円弧面の曲率半径がＲｉ≦Ｒｏとなるように設定されているので、加締加工時に円筒部が変形し易くなり、加締加工による内輪の変形を抑制すると共に、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 having a double row outer raceway formed on the inner periphery and a wheel mounting flange at one end, and extends in an axial direction from the wheel mounting flange. A hub ring formed with a small diameter step portion and at least one inner ring press-fitted into the small diameter step portion of the hub ring, and a double row inner rolling surface facing the double row outer rolling surface on the outer periphery. An inner member formed, and a double row rolling element that is rotatably accommodated between the rolling surfaces of the inner member and the outer member via a cage, In a wheel bearing device in which the inner ring is fixed in the axial direction by a caulking portion formed by plastically deforming an end portion radially outward, a chamfered portion connecting an inner diameter surface of the inner ring and a caulking side end surface is predetermined. The end of the small diameter step portion of the hub wheel is hollow. An annular groove having a predetermined depth is formed on the outer peripheral surface of the cylindrical portion, and this annular groove is applied to the chamfered portion of the inner ring on the inner side, and the inner side is inwardly rotated on the inner side of the inner ring. It is set in the range on the inner side from the running surface, and arc surfaces having predetermined radii of curvature Ri and Ro are formed on both sides, and the radius of curvature of these arc surfaces is set to satisfy Ri ≦ Ro. It is possible to provide a wheel bearing device in which the cylindrical portion is easily deformed during processing, the deformation of the inner ring due to caulking is suppressed, and the strength and durability are improved.

内周に複列の外側転走面が形成された外方部材と、一端部に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の一方に対向する内側転走面と、この内側転走面から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の他方に対向する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を備え、前記小径段部の端部を径方向外方に塑性変形させて形成した加締部により前記内輪が軸方向に固定された車輪用軸受装置において、前記内輪の内径面と加締側端面とを繋ぐ面取り部が所定の曲率半径ｒ１からなる円弧面を有し、前記ハブ輪における小径段部の端部が中空状の円筒部として形成され、この円筒部の外周面に深さが０．５〜１．０ｍｍの範囲に設定された環状溝が形成されると共に、この環状溝が、インナー側は前記内輪の面取り部にかかり、アウター側は前記内輪の内側転走面よりインナー側の範囲に設定され、両側に所定の曲率半径Ｒｉ、Ｒｏからなる円弧面が形成され、これら円弧面の曲率半径がＲ１〜Ｒ１０の範囲で、かつ、Ｒｉ≦Ｒｏとなるように設定されている。   An outer member having a double-row outer rolling surface formed on the inner periphery, and an inner rolling surface having a wheel mounting flange integrally formed at one end and facing one of the outer rolling surfaces of the double-row on the outer periphery. And a hub wheel formed with a small-diameter step portion extending in the axial direction from the inner rolling surface, and an inner side that is press-fitted into the small-diameter step portion of the hub wheel and faces the other of the double-row outer rolling surface on the outer periphery. An inner member composed of an inner ring formed with a rolling surface, and a double-row rolling element accommodated between the inner member and the outer member via a cage between the rolling surfaces of the inner member and the outer member. A bearing unit for a wheel in which the inner ring is fixed in an axial direction by a caulking portion formed by plastically deforming an end portion of the small diameter step portion radially outward, and an inner diameter surface and a caulking side end surface of the inner ring The chamfered portion that connects the two has a circular arc surface having a predetermined radius of curvature r1, and the end of the small-diameter step portion of the hub wheel is hollow. An annular groove formed as a cylindrical portion and having a depth set in a range of 0.5 to 1.0 mm is formed on the outer peripheral surface of the cylindrical portion, and the annular groove is a chamfered portion of the inner ring on the inner side. The outer side is set in a range on the inner side from the inner raceway surface of the inner ring, and arc surfaces having predetermined curvature radii Ri and Ro are formed on both sides, and the curvature radii of these arc surfaces are R1 to R10. The range is set such that Ri ≦ Ro.

以下、本発明の実施の形態を図面に基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一実施形態を示す縦断面図、図２は、加締前のハブ輪および内輪を示す要部拡大図、図３は、内輪押込み量と内輪のフープ応力の試験結果を示すグラフである。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（図面左側）、中央寄り側をインナー側（図面右側）という。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a longitudinal sectional view showing an embodiment of a wheel bearing device according to the present invention, FIG. 2 is an enlarged view of a main part showing a hub wheel and an inner ring before caulking, and FIG. 3 is an inner ring pushing amount and an inner ring. It is a graph which shows the test result of hoop stress of. In the following description, the side closer to the outer side of the vehicle in a state assembled to the vehicle is referred to as the outer side (left side in the drawing), and the side closer to the center is referred to as the inner side (right side in the drawing).

この車輪用軸受装置は従動輪側の第３世代と称され、内方部材１と外方部材１０、および両部材１、１０間に転動自在に収容された複列の転動体（ボール）６、６とを備えている。内方部材１は、ハブ輪２と、このハブ輪２に所定のシメシロを介して圧入された内輪３とからなる。   This wheel bearing device is referred to as the third generation on the driven wheel side, and is a double row rolling element (ball) accommodated between the inner member 1 and the outer member 10 and between both members 1 and 10 so as to roll freely. 6 and 6. The inner member 1 includes a hub ring 2 and an inner ring 3 that is press-fitted into the hub ring 2 through a predetermined scissors.

ハブ輪２は、アウター側の端部に車輪（図示せず）を取り付けるための車輪取付フランジ４を一体に有し、この車輪取付フランジ４の円周等配位置に車輪を固定するためのハブボルト５が植設されている。また、ハブ輪２の外周には一方（アウター側）の内側転走面２ａが直接形成され、この内側転走面２ａから軸方向に延びる小径段部２ｂが形成されている。そして、外周に他方（インナー側）の内側転走面３ａが形成された内輪３がこの小径段部２ｂに圧入され、さらに、小径段部２ｂの端部を径方向外方に塑性変形させて形成した加締部２ｃにより、ハブ輪２に対して内輪３が軸方向へ抜けるのを防止している。   The hub wheel 2 integrally has a wheel mounting flange 4 for mounting a wheel (not shown) at an end on the outer side, and a hub bolt for fixing the wheel at a circumferentially equidistant position of the wheel mounting flange 4. 5 is planted. Further, one (outer side) inner rolling surface 2a is directly formed on the outer periphery of the hub wheel 2, and a small-diameter step portion 2b extending in the axial direction from the inner rolling surface 2a is formed. And the inner ring | wheel 3 in which the inner side rolling surface 3a of the other (inner side) was formed in the outer periphery is press-fit in this small diameter step part 2b, and also the edge part of the small diameter step part 2b is plastically deformed to radial direction outward. The formed caulking portion 2 c prevents the inner ring 3 from coming off in the axial direction with respect to the hub wheel 2.

外方部材１０は、外周に車体（図示せず）に取り付けるための車体取付フランジ１０ｂを一体に有し、内周には複列の外側転走面１０ａ、１０ａが形成されている。そして、それぞれの転走面１０ａ、２ａと１０ａ、３ａ間に複列の転動体６、６が収容され、保持器７、７によりこれら複列の転動体６、６が転動自在に保持されている。また、外方部材１０の端部にはシール８、９が装着され、軸受内部に封入された潤滑グリースの漏洩と、外部から雨水やダスト等が軸受内部に侵入するのを防止している。   The outer member 10 integrally has a vehicle body mounting flange 10b for mounting to a vehicle body (not shown) on the outer periphery, and double row outer rolling surfaces 10a, 10a are formed on the inner periphery. And the double row rolling elements 6 and 6 are accommodated between each rolling surface 10a, 2a and 10a, 3a, and these double row rolling elements 6 and 6 are rollably hold | maintained by the holder | retainers 7 and 7. ing. Further, seals 8 and 9 are attached to the end portion of the outer member 10 to prevent leakage of the lubricating grease sealed inside the bearing and intrusion of rainwater, dust and the like from the outside into the bearing.

ここでは、ハブ輪２の外周に直接内側転走面２ａが形成された第３世代と呼称される車輪用軸受装置を例示したが、本発明に係る車輪用軸受装置はこうした構造に限定されず、例えば、ハブ輪の小径段部に一対の内輪を圧入した、第１世代あるいは第２世代構造であっても良い。なお、転動体６、６をボールとした複列アンギュラ玉軸受を例示したが、これに限らず転動体６に円すいころを使用した複列円すいころ軸受であっても良い。   Here, the wheel bearing device referred to as the third generation in which the inner raceway surface 2a is directly formed on the outer periphery of the hub wheel 2 is illustrated, but the wheel bearing device according to the present invention is not limited to such a structure. For example, it may be a first generation or second generation structure in which a pair of inner rings are press-fitted into a small diameter step portion of a hub ring. In addition, although the double row angular contact ball bearing which used the rolling elements 6 and 6 as the ball was illustrated, it is not restricted to this, The double row tapered roller bearing which uses the tapered roller for the rolling element 6 may be sufficient.

ハブ輪２はＳ５３Ｃ等の炭素０．４０〜０．８０重量％を含む中炭素鋼で形成され、アウター側の内側転走面２ａをはじめ、シール８が摺接するシールランド部、および小径段部２ｂに亙り高周波焼入れによって表面硬さを５８〜６４ＨＲＣの範囲に硬化層１１が形成されている。なお、加締部２ｃは、鍛造後の素材表面硬さ２５ＨＲＣ以下の未焼入れ部としている。一方、内輪３は、ＳＵＪ２等の高炭素クロム軸受鋼からなり、ズブ焼入れにより芯部まで５８〜６４ＨＲＣの範囲で硬化処理されている。   The hub wheel 2 is formed of medium carbon steel containing carbon of 0.40 to 0.80% by weight, such as S53C, and includes an outer side inner rolling surface 2a, a seal land part in which the seal 8 is in sliding contact, and a small diameter step part. The hardened layer 11 is formed in the range of 58 to 64 HRC by induction hardening over 2b. The caulking portion 2c is an unquenched portion having a material surface hardness of 25 HRC or less after forging. On the other hand, the inner ring 3 is made of high carbon chrome bearing steel such as SUJ2, and is hardened in the range of 58 to 64 HRC up to the core part by quenching.

また、外方部材１０は、ハブ輪２と同様、Ｓ５３Ｃ等の炭素０．４０〜０．８０重量％を含む中炭素鋼で形成され、複列の外側転走面１０ａ、１０ａ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。   The outer member 10 is formed of medium carbon steel containing 0.40 to 0.80% by weight of carbon, such as S53C, like the hub wheel 2, and the double row outer raceway surfaces 10a and 10a are formed by induction hardening. The surface hardness is set in the range of 58 to 64 HRC.

ここで、図２に示すように、内輪３の背面側の内径端部に曲率半径ｒ１がＲ１〜Ｒ３からなる面取り部３ｂが形成されている。一方、加締前におけるハブ輪２の小径段部２ｂの端部は中空状の円筒部１２として形成され、この円筒部１２の底面１２ａは、内輪３のインナー側の端面（背面）から所定の寸法ａになるように形成されている。また、円筒部１２の外周面に深さｂからなる環状溝１３が形成されている。この環状溝１３の幅は、インナー側には内輪３の面取り部３ｂにかかるように、アウター側には円筒部１２の底面１２ａを越え、内輪３の内側転走面３ａよりインナー側の範囲とされている。そして、この環状溝１３の両側にそれぞれ曲率半径Ｒｉ、Ｒｏからなる円弧面１３ａ、１３ｂが形成されている。なお、円筒部１２の底面１２ａの寸法ａが環状溝１３の幅よりも大きくなると円筒部１２が変形し易くなるものの、加締力が不足して所定の内輪固定力が得られない。   Here, as shown in FIG. 2, a chamfered portion 3 b having a radius of curvature r <b> 1 of R <b> 1 to R <b> 3 is formed at the inner diameter end portion on the back side of the inner ring 3. On the other hand, the end portion of the small-diameter step portion 2b of the hub wheel 2 before caulking is formed as a hollow cylindrical portion 12, and the bottom surface 12a of the cylindrical portion 12 is predetermined from the end surface (back surface) on the inner side of the inner ring 3. It is formed to have a dimension a. An annular groove 13 having a depth b is formed on the outer peripheral surface of the cylindrical portion 12. The width of the annular groove 13 is such that the inner side covers the chamfered portion 3b of the inner ring 3, the outer side exceeds the bottom surface 12a of the cylindrical portion 12, and the inner side of the inner ring 3 from the inner rolling surface 3a. Has been. Then, arc surfaces 13a and 13b having curvature radii Ri and Ro are formed on both sides of the annular groove 13, respectively. If the dimension a of the bottom surface 12a of the cylindrical portion 12 is larger than the width of the annular groove 13, the cylindrical portion 12 is easily deformed, but the caulking force is insufficient and a predetermined inner ring fixing force cannot be obtained.

本実施形態では、環状溝１３の深さｂは０．５〜１．０ｍｍ、インナー側の円弧面１３ａの曲率半径Ｒｉは、内輪３の面取り部３ｂの曲率半径ｒ１よりも大きく、アウター側の円弧面１３ｂの曲率半径Ｒｏよりも小さく設定され（ｒ１≦Ｒｉ≦Ｒｏ）、Ｒｉ＝１〜１０ｍｍの範囲に形成されている。円筒部１２の外周面に環状溝１３を形成することにより、加締加工時に円筒部１２が変形し易くなり、内輪３の変形を抑えることができる。ただし、環状溝１３の深さｂが０．５ｍｍよりも小さいとその効果が薄れ、また、深さｂが１．０ｍｍを超えると、内輪押込み量（加締力）が不足して所望の内輪３の固定力が得られない。   In the present embodiment, the depth b of the annular groove 13 is 0.5 to 1.0 mm, the radius of curvature Ri of the arcuate surface 13a on the inner side is larger than the radius of curvature r1 of the chamfered portion 3b of the inner ring 3, and It is set smaller than the radius of curvature Ro of the circular arc surface 13b (r1 ≦ Ri ≦ Ro), and is formed in the range of Ri = 1 to 10 mm. By forming the annular groove 13 on the outer peripheral surface of the cylindrical portion 12, the cylindrical portion 12 is easily deformed during caulking, and deformation of the inner ring 3 can be suppressed. However, if the depth b of the annular groove 13 is smaller than 0.5 mm, the effect is reduced. If the depth b exceeds 1.0 mm, the inner ring pushing amount (clamping force) is insufficient and the desired inner ring is reduced. A fixing force of 3 cannot be obtained.

本出願人が実施した加締試験結果を図３に示す。ここで、環状溝１３の深さｂ＝０．５ｍｍ、アウター側の円弧面１３ｂの曲率半径Ｒｏ＝Ｒ７．８とし、インナー側の円弧面１３ａの曲率半径ＲｉをＲ３、Ｒ５、Ｒ７．８とした。図３のグラフから明らかなように、曲率半径Ｒｉが小さくなるほど内輪３の外径に発生するフープ応力が低下することが判る。なお、Ｒｉ＜ｒ１となれば、内輪３のフープ応力が小さくなるものの、内輪押込み量が不足して所望の内輪３の固定力が得られない。また、Ｒｉ＞Ｒｏとなれば、内輪押し込み量が、例えば３５μｍを超えた時、内輪３のフープ応力が２５０ＭＰａを超え、過大応力となるため好ましくない。   The results of the caulking test conducted by the present applicant are shown in FIG. Here, the depth b of the annular groove 13 is 0.5 mm, the curvature radius Ro of the outer arc surface 13b is Ro = R7.8, and the curvature radius Ri of the inner arc surface 13a is R3, R5, and R7.8. did. As is apparent from the graph of FIG. 3, it can be seen that the hoop stress generated at the outer diameter of the inner ring 3 decreases as the curvature radius Ri decreases. If Ri <r1, the hoop stress of the inner ring 3 is reduced, but the inner ring pushing amount is insufficient and a desired fixing force of the inner ring 3 cannot be obtained. In addition, if Ri> Ro, when the inner ring pushing amount exceeds 35 μm, for example, the hoop stress of the inner ring 3 exceeds 250 MPa, which is not preferable.

このように、本実施形態では、加締前のハブ輪２における小径段部２ｂの端部が中空状の円筒部１２として形成され、この円筒部１２の外周面に所定の深さｂの環状溝１３が形成されると共に、この環状溝１３の幅が、インナー側には内輪３の面取り部３ｂにかかり、アウター側には内側転走面３ａよりインナー側の範囲に設定され、両側に所定の曲率半径Ｒｉ、Ｒｏからなる円弧面１３ａ、１３ｂが形成されているので、加締加工時に円筒部１２が変形し易くなり、所定の内輪固定力を確保して加締加工による内輪３の変形を抑制すると共に、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 this embodiment, the end of the small-diameter step portion 2b in the hub wheel 2 before caulking is formed as a hollow cylindrical portion 12, and an annular surface having a predetermined depth b is formed on the outer peripheral surface of the cylindrical portion 12. A groove 13 is formed, and the width of the annular groove 13 is set on the inner side of the chamfered portion 3b of the inner ring 3, and is set on the outer side in a range closer to the inner side than the inner rolling surface 3a. Since the circular arc surfaces 13a and 13b having the curvature radii Ri and Ro are formed, the cylindrical portion 12 is easily deformed during the caulking process, and the inner ring 3 is deformed by the caulking process while securing a predetermined inner ring fixing force. It is possible to provide a wheel bearing device that suppresses the above and improves strength and durability.

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、ハブ輪の小径段部に内輪を圧入し、小径段部の端部を塑性変形させて形成した加締部によって内輪を固定した第１世代乃至第３世代のセルフリテイン構造の車輪用軸受装置に適用できる。   In the wheel bearing device according to the present invention, the inner ring is fixed by a caulking portion formed by press-fitting an inner ring into a small-diameter step portion of a hub wheel and plastically deforming an end portion of the small-diameter step portion. It can be applied to a self-retained wheel bearing device.

本発明に係る車輪用軸受装置の一実施形態を示す縦断面図である。It is a longitudinal section showing one embodiment of a wheel bearing device concerning the present invention. 図１の加締前のハブ輪および内輪を示す要部拡大図である。It is a principal part enlarged view which shows the hub ring and inner ring | wheel before caulking of FIG. 内輪押込み量と内輪のフープ応力の試験結果を示すグラフである。It is a graph which shows the test result of the inner ring pushing amount and the hoop stress of the inner ring. 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. 図４の加締前のハブ輪と内輪を示す要部拡大図である。FIG. 5 is a main part enlarged view showing a hub wheel and an inner ring before caulking in FIG. 4.

符号の説明Explanation of symbols

１・・・・・・・・・内方部材
２・・・・・・・・・ハブ輪
２ａ、３ａ・・・・・内側転走面
２ｂ・・・・・・・・小径段部
２ｃ・・・・・・・・加締部
２ｄ・・・・・・・・セレーション
３・・・・・・・・・内輪
３ｂ・・・・・・・・面取り部
４・・・・・・・・・車輪取付フランジ
５・・・・・・・・・ハブボルト
６・・・・・・・・・転動体
７・・・・・・・・・保持器
８、９・・・・・・・シール
１０・・・・・・・・外方部材
１０ａ・・・・・・・外側転走面
１０ｂ・・・・・・・車体取付フランジ
１１・・・・・・・・硬化層
１２・・・・・・・・円筒部
１２ａ・・・・・・・底面
１３・・・・・・・・環状溝
１３ａ、１３ｂ・・・円弧面
５１・・・・・・・・内方部材
５２・・・・・・・・ハブ輪
５２ａ、５３ａ・・・内側転走面
５２ｂ・・・・・・・小径段部
５２ｃ・・・・・・・加締部
５３・・・・・・・・内輪
５４・・・・・・・・車輪取付フランジ
５５・・・・・・・・ボール
５６・・・・・・・・保持器
５７、５８・・・・・シール
６０・・・・・・・・外方部材
６０ａ・・・・・・・外側転走面
６０ｂ・・・・・・・車体取付フランジ
７０・・・・・・・・円筒部
７１・・・・・・・・環状溝
ａ、ｄ１・・・・・・円筒部の底面と内輪の端面の寸法
ｂ、ｎ・・・・・・・環状溝の深さ
Ｄ１・・・・・・・・円筒部の根元部の肉厚
Ｄ２・・・・・・・・円筒部の先端部の肉厚
ｒ１・・・・・・・・内輪の面取り部の曲率半径
ｒ２・・・・・・・・環状溝の円弧面の曲率半径
Ｒｉ・・・・・・・・環状溝におけるインナー側の円弧面の曲率半径
Ｒｏ・・・・・・・・環状溝におけるアウター側の円弧面の曲率半径 1 ... inner member 2 ... hub wheels 2a, 3a ... inner rolling surface 2b ... small diameter step 2c ····················································· Serration 3 ················································ ... Wheel mounting flange 5 ... Hub bolt 6 ... Rolling element 7 ... Cage 8, 9 ... · Seal 10 · · · · · Outer member 10a · · · Outer rolling surface 10b · · · Car body mounting flange 11 · · · Hardened layer 12 · · · ··········· Cylinder 12a ········································································ ... Hub wheels 52a, 53a ... Inside Running surface 52b ... Small diameter step 52c ... Clamping 53 ... Inner ring 54 ... Wheel mounting flange 55 ... ... Ball 56 ... Cage 57, 58 ... Seal 60 ... Outer member 60a ... Outer rolling surface 60b ··· Body mounting flange 70 ······························································ Dimension b, n ·········· Depth groove depth D1 ··· Thickness D2 at the base of the cylindrical portion ···················· Thickness r1 ... curvature radius r2 of the chamfered portion of the inner ring ... curvature radius Ri of the circular arc surface of the annular groove ... inner arc in the annular groove Surface radius of curvature Ro ... .... curvature radius of the arc surface of the outer side of the annular groove

Claims (4)

内周に複列の外側転走面が形成された外方部材と、
一端部に車輪取付フランジを一体に有し、この車輪取付フランジから軸方向に延びる小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入された少なくとも一つの内輪からなり、外周に前記複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、
この内方部材と前記外方部材の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、
前記小径段部の端部を径方向外方に塑性変形させて形成した加締部により前記内輪が軸方向に固定された車輪用軸受装置において、
前記内輪の内径面と加締側端面とを繋ぐ面取り部が所定の曲率半径ｒ１からなる円弧面を有し、前記ハブ輪における小径段部の端部が中空状の円筒部として形成され、この円筒部の外周面に所定の深さの環状溝が形成されると共に、この環状溝が、インナー側は前記内輪の面取り部にかかり、アウター側は前記内輪の内側転走面よりインナー側の範囲に設定され、両側に所定の曲率半径Ｒｉ、Ｒｏからなる円弧面が形成され、これら円弧面の曲率半径がＲｉ≦Ｒｏとなるように設定されていることを特徴とする車輪用軸受装置。 An outer member having a double row outer raceway formed on the inner periphery;
It has a wheel mounting flange integrally at one end, a hub wheel formed with a small diameter step extending in the axial direction from the wheel mounting flange, and at least one inner ring press-fitted into the small diameter step of the hub wheel, An inner member in which a double row inner rolling surface facing the outer row rolling surface of the double row is formed on the outer periphery;
A double row rolling element that is accommodated so as to roll freely between the rolling surfaces of the inner member and the outer member via a cage,
In the wheel bearing device in which the inner ring is fixed in the axial direction by a caulking portion formed by plastically deforming an end portion of the small diameter step portion radially outwardly,
The chamfered portion connecting the inner diameter surface of the inner ring and the crimping end surface has an arc surface having a predetermined radius of curvature r1, and the end portion of the small diameter step portion of the hub wheel is formed as a hollow cylindrical portion. An annular groove having a predetermined depth is formed on the outer peripheral surface of the cylindrical portion, and this annular groove is applied to the chamfered portion of the inner ring on the inner side, and the outer side is a range on the inner side from the inner rolling surface of the inner ring. The wheel bearing device is characterized in that an arc surface having predetermined radii of curvature Ri and Ro is formed on both sides, and the radius of curvature of these arc surfaces is set to satisfy Ri ≦ Ro. 前記環状溝におけるインナー側の円弧面の曲率半径Ｒｉが、前記内輪の面取り部の曲率半径ｒ１よりも大きく、ｒ１≦Ｒｉとなるように設定されている請求項１に記載の車輪用軸受装置。   2. The wheel bearing device according to claim 1, wherein a radius of curvature Ri of the inner circular arc surface in the annular groove is set to be larger than a radius of curvature r <b> 1 of the chamfered portion of the inner ring, and r <b> 1 ≦ Ri. 前記環状溝の深さが０．５〜１．０ｍｍの範囲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 wheel bearing device according to claim 1 or 2, wherein a depth of the annular groove is set in a range of 0.5 to 1.0 mm. 前記環状溝における円弧面の曲率半径Ｒｉ、ＲｏがＲ１〜Ｒ１０の範囲に設定されている請求項１乃至３いずれかに記載の車輪用軸受装置。   The wheel bearing device according to any one of claims 1 to 3, wherein radii of curvature Ri and Ro of the circular arc surface in the annular groove are set in a range of R1 to R10.
JP2005322322A 2005-11-07 2005-11-07 Wheel bearing device Active JP4462629B2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007154931A (en) * 2005-12-01 2007-06-21 Ntn Corp Bearing device for wheel
JP2007211795A (en) * 2006-02-07 2007-08-23 Ntn Corp Wheel bearing device
JP2007218304A (en) * 2006-02-15 2007-08-30 Ntn Corp Bearing device for wheel
IT201800010333A1 (en) * 2018-11-15 2020-05-15 Skf Ab FLANGED INTERNAL RING FOR ORBITAL DEFORMATION OPERATION

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007154931A (en) * 2005-12-01 2007-06-21 Ntn Corp Bearing device for wheel
JP2007211795A (en) * 2006-02-07 2007-08-23 Ntn Corp Wheel bearing device
JP2007218304A (en) * 2006-02-15 2007-08-30 Ntn Corp Bearing device for wheel
JP4697963B2 (en) * 2006-02-15 2011-06-08 Ｎｔｎ株式会社 Wheel bearing device
IT201800010333A1 (en) * 2018-11-15 2020-05-15 Skf Ab FLANGED INTERNAL RING FOR ORBITAL DEFORMATION OPERATION
US10871192B2 (en) 2018-11-15 2020-12-22 Aktiebolaget Skf Flanged inner ring for orbital forming operation

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