JP5000206B2 - Wheel bearing device - Google Patents

Wheel bearing device Download PDF

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JP5000206B2
JP5000206B2 JP2006173725A JP2006173725A JP5000206B2 JP 5000206 B2 JP5000206 B2 JP 5000206B2 JP 2006173725 A JP2006173725 A JP 2006173725A JP 2006173725 A JP2006173725 A JP 2006173725A JP 5000206 B2 JP5000206 B2 JP 5000206B2
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wheel
diameter
rolling
hub
bearing device
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JP2008002608A (en
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和則 久保田
一宏 馬場
和雄 小森
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NTN Corp
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NTN Corp
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Priority to JP2006173725A priority Critical patent/JP5000206B2/en
Priority to CN200780019433XA priority patent/CN101454587B/en
Priority to PCT/JP2007/000554 priority patent/WO2007138740A1/en
Priority to DE112007001272.2T priority patent/DE112007001272B4/en
Publication of JP2008002608A publication Critical patent/JP2008002608A/en
Priority to US12/277,427 priority patent/US7641394B2/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction 

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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・コンパクト化を図ると共に、剛性を増大させて軸受の長寿命化を図った車輪用軸受装置に関するものである。   BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel bearing device that rotatably supports a wheel of an automobile or the like, and more particularly to a wheel bearing device that achieves light weight and compactness and increases rigidity to extend the life of a bearing. .

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。一方、オフロードカーやトラック等、車体重量が嵩む車両には複列円錐ころ軸受が使用されている。   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. On the other hand, double row tapered roller bearings are used in vehicles such as off-road cars and trucks that have a heavy vehicle body weight.

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、従来は両列の軸受が同一仕様のため、静止時には充分な剛性を有するが、車両の旋回時には必ずしも最適な剛性が得られていない。すなわち、静止時の車重は複列の転がり軸受の略中央に作用するように車輪との位置関係が決められているが、旋回時には、旋回方向の反対側（右旋回の場合は車両の左側）の車軸により大きなラジアル荷重やアキシアル荷重が負荷される。したがって、旋回時には、インナー側の軸受列よりもアウター側の軸受列の剛性を高めることが有効とされている。そこで、装置を大型化させることなく旋回時の剛性を向上させた車輪用軸受装置として、図４に示すものが知られている。   In such a wheel bearing device, conventionally, both rows of bearings have the same specification, so that they have sufficient rigidity when stationary, but the optimum rigidity is not always obtained when the vehicle turns. That is, the position of the vehicle weight when stationary is determined so that it acts on the approximate center of the double row rolling bearing, but when turning, the opposite side of the turning direction (when turning right, the vehicle A large radial load or axial load is applied to the left axle. Therefore, at the time of turning, it is effective to increase the rigidity of the outer bearing row rather than the inner bearing row. Then, what is shown in FIG. 4 is known as a wheel bearing apparatus which improved the rigidity at the time of turning, without enlarging an apparatus.

この車輪用軸受装置５０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５１ｃを一体に有し、内周に複列の外側転走面５１ａ、５１ｂが形成された外方部材５１と、一端部に車輪（図示せず）を取り付けるための車輪取付フランジ５３を一体に有し、外周に複列の外側転走面５１ａ、５１ｂに対向する一方の内側転走面５２ａと、この内側転走面５２ａから軸方向に延びる小径段部５２ｂが形成されたハブ輪５２、およびこのハブ輪５２の小径段部５２ｂに外嵌され、複列の外側転走面５１ａ、５１ｂに対向する他方の内側転走面５４ａが形成された内輪５４からなる内方部材５５と、これら両転走面間に収容された複列のボール５６、５７と、これら複列のボール５６、５７を転動自在に保持する保持器５８、５９とを備えた複列アンギュラ玉軸受で構成されている。   This wheel bearing device 50 has a vehicle body mounting flange 51c integrally attached to a knuckle (not shown) on the outer periphery, and an outer side in which double row outer rolling surfaces 51a and 51b are formed on the inner periphery. A member 51 and a wheel mounting flange 53 for mounting a wheel (not shown) at one end are integrally formed, and one inner rolling surface 52a facing the double row outer rolling surfaces 51a and 51b on the outer periphery. The hub wheel 52 having a small-diameter step portion 52b extending in the axial direction from the inner rolling surface 52a and the small-diameter step portion 52b of the hub wheel 52 are externally fitted to the double-row outer rolling surfaces 51a and 51b. An inner member 55 composed of an inner ring 54 formed with the other inner rolling surface 54a facing each other, double rows of balls 56, 57 accommodated between both rolling surfaces, and these double rows of balls 56, 57 A retainer 58 for freely rolling It is composed of a double row angular contact ball bearing with a 9.

内輪５４は、ハブ輪５２の小径段部５２ｂを径方向外方に塑性変形させて形成した加締部５２ｃによって軸方向に固定されている。そして、外方部材５１と内方部材５５との間に形成される環状空間の開口部にシール６０、６１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、外部から軸受内部に雨水やダスト等が侵入するのを防止している。   The inner ring 54 is fixed in the axial direction by a caulking portion 52c formed by plastically deforming a small diameter step portion 52b of the hub wheel 52 radially outward. Seals 60 and 61 are attached to the opening of the annular space formed between the outer member 51 and the inner member 55, leakage of the lubricating grease sealed inside the bearing, and rainwater from the outside into the bearing. And dust are prevented from entering.

ここで、アウター側のボール５６のピッチ円直径Ｄ１が、インナー側のボール５７のピッチ円直径Ｄ２よりも大径に設定されている。これに伴い、ハブ輪５２の内側転走面５２ａが内輪５４の内側転走面５４ａよりも拡径され、あわせて外方部材５１のアウター側の外側転走面５１ａがインナー側の外側転走面５１ｂよりも拡径されている。そして、アウター側のボール５６がインナー側のボール５７よりも多数収容されている。このように、各ピッチ円直径Ｄ１、Ｄ２をＤ１＞Ｄ２に設定することにより、車両の静止時だけでなく旋回時においても剛性が向上し、車輪用軸受装置５０の長寿命化を図ることができる。
特開２００４−１０８４４９号公報 Here, the pitch circle diameter D1 of the outer side ball 56 is set larger than the pitch circle diameter D2 of the inner side ball 57. Along with this, the inner rolling surface 52a of the hub wheel 52 is expanded in diameter than the inner rolling surface 54a of the inner ring 54, and the outer rolling surface 51a on the outer side of the outer member 51 is also rolled on the inner side. The diameter is larger than that of the surface 51b. The outer side balls 56 are accommodated more than the inner side balls 57. In this way, by setting the pitch circle diameters D1 and D2 to D1> D2, the rigidity is improved not only when the vehicle is stationary but also when turning, and the life of the wheel bearing device 50 can be extended. it can.
JP 2004-108449 A

こうした従来の車輪用軸受装置５０では、アウター側のボール５６のピッチ円直径Ｄ１がインナー側のボール５７のピッチ円直径Ｄ２よりも大径に設定され、これに伴い、ハブ輪５２の内側転走面５２ａが内輪５４の内側転走面５４ａよりも拡径されていることによりアウター側の軸受列の剛性が向上し、車輪用軸受装置５０の長寿命化を図ることができる。然しながら、アウター側の軸受列の剛性に対し、インナー側の軸受列の剛性が不足すると共に、ハブ輪５２のアウター側が拡径されて形成されているため、少なくともこの拡径分の重量アップは避けることができず、装置の軽量化には限界があった。   In such a conventional wheel bearing device 50, the pitch circle diameter D1 of the outer ball 56 is set to be larger than the pitch circle diameter D2 of the inner ball 57, and accordingly, the inner rolling of the hub wheel 52 is performed. Since the diameter of the surface 52a is larger than that of the inner rolling surface 54a of the inner ring 54, the rigidity of the outer bearing row is improved, and the life of the wheel bearing device 50 can be extended. However, the rigidity of the inner side bearing row is insufficient with respect to the rigidity of the outer side bearing row, and the outer side of the hub wheel 52 is formed with a larger diameter. It was impossible to reduce the weight of the device.

本発明は、このような事情に鑑みてなされたもので、装置の軽量・コンパクト化と高剛性化という相反する課題を解決した車輪用軸受装置を提供することを目的としている。   The present invention has been made in view of such circumstances, and an object of the present invention is to provide a wheel bearing device that solves the conflicting problems of light weight, compactness, and high rigidity of the device.

係る目的を達成すべく、本発明のうち請求項１記載の発明は、外周にナックルに取り付けられるための車体取付フランジを一体に有し、内周に複列の外側転走面が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所定のシメシロを介して圧入され、外周に前記複列の外側転走面に対向する他方の内側転走面が形成された内輪からなる内方部材と、この内方部材と前記外方部材の両転走面間に転動自在に収容された複列の転動体とを備え、前記ハブ輪の小径段部を径方向外方に塑性変形させて形成した加締部によって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、前記複列の転動体のうちインナー側の転動体が円錐ころで構成され、このインナー側の円錐ころのピッチ円直径が前記アウター側の転動体のピッチ円直径よりも小径に設定され、前記ハブ輪の軸状部と前記内輪と突き合わされる肩部との間の段部に面取り部が形成されると共に、前記ハブ輪の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内側転走面の溝底部を越えて前記面取り部付近とされ、前記内輪の外周にテーパ状の内側転走面と、この内側転走面の大径側に前記円錐ころを案内する大鍔が形成され、この大鍔外径からインナー側に所定の段差を介して小径部が形成されている。
In order to achieve the object, the invention according to claim 1 of the present invention has a vehicle body mounting flange integrally attached to the knuckle on the outer periphery, and a double row outer rolling surface is formed on the inner periphery. An outer member, and a wheel mounting flange for mounting a wheel at one end are integrally formed, one inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and an axis from the inner rolling surface A hub wheel formed with a small-diameter step portion extending in the axial direction through the ring-shaped portion , and press-fitted into the small-diameter step portion of the hub wheel via a predetermined shimiro, and opposed to the outer rolling surface of the double row on the outer periphery An inner member formed of an inner ring on which the other inner rolling surface is formed, and a double-row rolling element accommodated so as to roll between the inner member and both rolling surfaces of the outer member, The inner ring is formed by a caulking portion formed by plastically deforming a small-diameter step portion of the hub ring radially outward. In the wheel bearing device fixed in the axial direction, the inner-side rolling elements of the double-row rolling elements are constituted by tapered rollers, and the pitch circle diameter of the inner-side tapered rollers is the same as that of the outer-side rolling elements. A chamfered portion is formed at a step portion between the shaft-shaped portion of the hub wheel and a shoulder portion that is abutted against the inner ring, and an end portion on the outer side of the hub wheel. A mortar-shaped recess is formed, and the depth of the recess exceeds the groove bottom of the inner raceway surface of the hub wheel and is in the vicinity of the chamfered portion, and a tapered inner raceway surface on the outer periphery of the inner race A large flange for guiding the tapered roller is formed on the large diameter side of the inner rolling surface, and a small diameter portion is formed from the large diameter outer diameter to the inner side through a predetermined step.

このように、外周に車体取付フランジを有する外方部材と、一端部に車輪取付フランジを有し、外周に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、およびこのハブ輪に圧入された内輪からなる内方部材と、この内方部材と外方部材間に収容された複列の転動体とを備え、ハブ輪の小径段部を径方向外方に塑性変形させて形成した加締部によって内輪が軸方向に固定された第３世代構造の車輪用軸受装置において、複列の転動体のうちインナー側の転動体が円錐ころで構成され、このインナー側の円錐ころのピッチ円直径がアウター側の転動体のピッチ円直径よりも小径に設定され、ハブ輪の軸状部と内輪と突き合わされる肩部との間の段部に面取り部が形成されると共に、ハブ輪の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内側転走面の溝底部を越えて面取り部付近とされ、内輪の外周にテーパ状の内側転走面と、この内側転走面の大径側に円錐ころを案内する大鍔が形成され、この大鍔外径からインナー側に所定の段差を介して小径部が形成されているので、装置の軽量・コンパクト化と高剛性化という相反する課題を解決すると共に、加締加工時に内輪が径方向外方に押し広げられても外径面に発生するフープ応力を低減することができ、大鍔に倒れが発生するのを抑制することができる。
Thus, the outer member having a body mounting flange on the outer periphery, have a wheel mounting flange at one end, and the inner raceway surface of the one facing the outer raceway run face of double row outer periphery, the inner rolling A hub ring formed with a small-diameter stepped portion extending in the axial direction from the surface through the shaft-shaped portion, an inner member formed of an inner ring press-fitted into the hub ring, and the inner member and the outer member are accommodated. A third-generation wheel bearing device in which the inner ring is fixed in the axial direction by a crimping portion formed by plastically deforming a small-diameter step portion of the hub wheel radially outward. Of the double row rolling elements, the inner side rolling element is constituted by a tapered roller, and the pitch circle diameter of the inner side tapered roller is set to be smaller than the pitch circle diameter of the outer side rolling element . A chamfered portion is formed at the step between the shaft-shaped portion and the shoulder that is abutted against the inner ring. Together are made, conical recess is formed at an end portion of the outer side of the hub wheel, the depth of the recess is a near chamfered portion beyond the groove bottom of the inner raceway surface of the wheel hub, an inner ring A tapered inner rolling surface is formed on the outer periphery of the inner surface, and a large collar for guiding the tapered roller is formed on the larger diameter side of the inner rolling surface, and a small diameter portion is formed from the outer diameter of the large collar to the inner side through a predetermined step. As a result, the hoop stress that occurs on the outer diameter surface even when the inner ring is pushed radially outward during caulking is solved. Can be reduced, and the occurrence of a fall in a large bowl can be suppressed.

好ましくは、請求項２に記載の発明のように、前記内輪と小径段部とのシメシロがインナー側に行くに従って漸次増大していれば、加締部の近傍の内輪緊迫力が増して小径段部の変形を抑えることができる。   Preferably, as in the second aspect of the invention, if the squeezing between the inner ring and the small diameter step portion gradually increases toward the inner side, the inner ring pressing force in the vicinity of the caulking portion increases and the small diameter step portion increases. The deformation of the part can be suppressed.

また、請求項３に記載の発明のように、前記内輪における内側転走面の大径端が当該内輪の大端面から軸方向に５ｍｍ以上離間して形成されていれば、加締加工による内輪の大鍔倒れを防止して円錐ころとの良好な接触状態を確保することができる。   Further, as in the invention according to claim 3, if the large-diameter end of the inner raceway surface of the inner ring is formed 5 mm or more away from the large end surface of the inner ring in the axial direction, the inner ring is formed by caulking. It is possible to prevent a large amount of falling and secure a good contact state with the tapered roller.

また、請求項４に記載の発明のように、前記ハブ輪のアウター側の端部が前記凹所に対応して略均一な肉厚で所定の範囲に設定されていれば、使用条件に対応したハブ輪の強度・剛性を確保しつつ、軽量化を達成することができる。
It is preferable as defined in claim 4, if the end portion of the outer side of the hub wheel has been set in a predetermined range substantially in uniform wall thickness corresponding to said recess, corresponding to the use condition Weight reduction can be achieved while ensuring the strength and rigidity of the hub wheel.

好ましくは、請求項５に記載の発明のように、前記ハブ輪の内側転走面の肉厚が、その部位の直径の０．２〜０．３の範囲に設定されていれば良い。   Preferably, as in the invention described in claim 5, the thickness of the inner rolling surface of the hub wheel may be set in the range of 0.2 to 0.3 of the diameter of the portion.

本発明に係る車輪用軸受装置は、外周にナックルに取り付けられるための車体取付フランジを一体に有し、内周に複列の外側転走面が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所定のシメシロを介して圧入され、外周に前記複列の外側転走面に対向する他方の内側転走面が形成された内輪からなる内方部材と、この内方部材と前記外方部材の両転走面間に転動自在に収容された複列の転動体とを備え、前記ハブ輪の小径段部を径方向外方に塑性変形させて形成した加締部によって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、前記複列の転動体のうちインナー側の転動体が円錐ころで構成され、このインナー側の円錐ころのピッチ円直径が前記アウター側の転動体のピッチ円直径よりも小径に設定され、前記ハブ輪の軸状部と前記内輪と突き合わされる肩部との間の段部に面取り部が形成されると共に、前記ハブ輪の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内側転走面の溝底部を越えて前記面取り部付近とされ、前記内輪の外周にテーパ状の内側転走面と、この内側転走面の大径側に前記円錐ころを案内する大鍔が形成され、この大鍔外径からインナー側に所定の段差を介して小径部が形成されているので、装置の軽量・コンパクト化と高剛性化という相反する課題を解決すると共に、加締加工時に内輪が径方向外方に押し広げられても外径面に発生するフープ応力を低減することができ、大鍔に倒れが発生するのを抑制することができる。
The wheel bearing device according to the present invention has an outer member integrally formed with a vehicle body mounting flange to be attached to the knuckle on the outer periphery, a double row outer rolling surface formed on the inner periphery, and a wheel at one end. A wheel mounting flange for mounting the inner ring, and one outer rolling surface facing the outer rolling surface of the double row on the outer periphery, and extending in the axial direction from the inner rolling surface via the shaft portion. A hub wheel having a small-diameter step portion, and a small-diameter step portion of the hub wheel are press-fitted through a predetermined scissors, and the other inner rolling surface facing the double-row outer rolling surface is formed on the outer periphery. An inner member formed of an inner ring, and a double row rolling element that is slidably accommodated between both rolling surfaces of the inner member and the outer member. For wheels in which the inner ring is fixed in the axial direction by a caulking portion formed by plastic deformation outward in the direction In the receiving device, of the double row rolling elements, an inner side rolling element is constituted by a tapered roller, and a pitch circle diameter of the inner side tapered roller is set to be smaller than a pitch circle diameter of the outer side rolling element. A chamfered portion is formed at a step portion between the shaft-shaped portion of the hub ring and a shoulder portion that is abutted against the inner ring, and a mortar-shaped recess is formed at an outer end portion of the hub ring. The depth of the recess exceeds the groove bottom portion of the inner raceway surface of the hub wheel and is in the vicinity of the chamfered portion, and the inner raceway has a tapered inner raceway surface on the outer periphery of the inner race. A large flange for guiding the tapered roller is formed on the large diameter side, and a small diameter portion is formed from the outer diameter of the large flange to the inner side through a predetermined step, so that the device is lighter, more compact and more rigid. In addition to solving conflicting issues, the inner ring is Be spread in the outward direction it is possible to reduce the hoop stress generated in the outer diameter surface, it fell to the large rib can be suppressed.

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所定のシメシロを介して圧入され、外周に前記複列の外側転走面に対向する他方の内側転走面が形成された内輪からなる内方部材と、この内方部材と前記外方部材の両転走面間に転動自在に収容された複列の転動体とを備え、前記ハブ輪の小径段部を径方向外方に塑性変形させて形成した加締部によって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、前記複列の転動体のうちインナー側の転動体が円錐ころで構成され、このインナー側の円錐ころのピッチ円直径が前記アウター側の転動体のピッチ円直径よりも小径に設定され、前記ハブ輪の軸状部と前記内輪と突き合わされる肩部との間の段部に面取り部が形成されると共に、前記ハブ輪の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内側転走面の溝底部を越えて前記面取り部付近とされ、前記内輪の外周にテーパ状の内側転走面と、この内側転走面の大径側に前記円錐ころを案内する大鍔が形成され、この大鍔外径からインナー側に所定の段差を介して小径部が形成され、前記内輪の内径面がテーパ面に形成されて前記小径段部とのシメシロがインナー側に行くに従って漸次増大している。 A body mounting flange for mounting to the knuckle on the outer periphery is integrated, an outer member with a double row outer raceway formed on the inner periphery, and a wheel mounting flange for mounting the wheel on one end is integrated. A hub wheel having 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 portion, And an inner member formed of an inner ring that is press-fitted into a small-diameter step portion of the hub ring through a predetermined shimoshiro and has the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery, And a double row rolling element that is accommodated in a freely rolling manner between both rolling surfaces of the inner member and the outer member, and is formed by plastically deforming the small diameter step portion of the hub wheel radially outward. In the wheel bearing device in which the inner ring is fixed in the axial direction by a caulking portion, the double row rolling device is provided. Rolling elements of the inner side of the body is composed of a tapered roller, a pitch circle diameter of the tapered rollers of the inner side is set smaller in diameter than the pitch circle diameter of the rolling elements of the outer side, the shaft-like portion of the hub wheel A chamfered portion is formed at the step between the inner ring and the shoulder that is abutted against the inner ring, and a mortar-shaped recess is formed at the outer end of the hub wheel. Beyond the groove bottom of the inner raceway surface of the hub wheel, it is in the vicinity of the chamfered portion , a tapered inner raceway surface on the outer periphery of the inner race, and the tapered roller is guided to the larger diameter side of the inner raceway surface A small diameter portion is formed from the large diameter outer diameter to the inner side through a predetermined step, an inner diameter surface of the inner ring is formed into a tapered surface, and the small diameter stepped portion is It gradually increases as you go.

以下、本発明の実施の形態を図面に基づいて詳細に説明する。
図１は、本発明に係る車輪用軸受装置の第１の実施形態を示す縦断面図、図２（ａ）は、図１の要部拡大図、（ｂ）は、（ａ）の加締前の要部拡大図である。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 a first embodiment of a wheel bearing device according to the present invention, FIG. 2 (a) is an enlarged view of a main part of FIG. 1, and (b) is a caulking of (a). It is a front principal part enlarged view. 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数のボール３および円錐ころ４を備えている。内方部材１は、ハブ輪５と、このハブ輪５に所定のシメシロを介して圧入された内輪６とからなる。   This wheel bearing device is for a driven wheel called the third generation, and includes an inner member 1 and an outer member 2, and a plurality of balls 3 accommodated so as to roll between both members 1 and 2. A tapered roller 4 is provided. The inner member 1 includes a hub ring 5 and an inner ring 6 press-fitted into the hub ring 5 through a predetermined shimiro.

ハブ輪５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７を一体に有し、外周に一方（アウター側）の円弧状の内側転走面５ａと、この内側転走面５ａから軸方向に延びる軸状部８を介して小径段部５ｂが形成されている。車輪取付フランジ７にはハブボルト７ａが周方向等配に植設されると共に、これらハブボルト７ａ間には円孔７ｂが形成されている。この円孔７ｂは軽量化に寄与できるだけでなく、装置の組立・分解工程において、レンチ等の締結治具をこの円孔７ｂから挿入することができ作業を簡便化することができる。   The hub wheel 5 integrally has a wheel mounting flange 7 for mounting a wheel (not shown) at one end portion, one (outer side) arcuate inner rolling surface 5a on the outer periphery, and this inner rolling. A small-diameter step portion 5b is formed through an axial portion 8 extending in the axial direction from the surface 5a. Hub bolts 7a are planted on the wheel mounting flange 7 in a circumferentially uniform manner, and circular holes 7b are formed between the hub bolts 7a. The circular hole 7b not only contributes to weight reduction, but also a fastening jig such as a wrench can be inserted from the circular hole 7b in the assembly / disassembly process of the apparatus, and the work can be simplified.

内輪６は、外周に他方（インナー側）のテーパ状の内側転走面６ａが形成され、この内側転走面６ａの大径側に円錐ころ４を案内するための大鍔６ｂと、小径側に円錐ころ４の脱落を防止するための小鍔６ｃがそれぞれ形成されている。そして、この内輪６はハブ輪５の小径段部５ｂ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５ｂの端部を塑性変形させて形成した加締部９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。これにより、軽量・コンパクト化を図ると共に、初期に設定した予圧を長期間に亘って維持するセルフリテイン構造を提供することができる。   The inner ring 6 is formed with the other (inner side) tapered inner rolling surface 6a on the outer periphery, a large collar 6b for guiding the tapered roller 4 to the large diameter side of the inner rolling surface 6a, and a small diameter side In addition, a small scissors 6c for preventing the tapered roller 4 from falling off is formed. The inner ring 6 is press-fitted into the small-diameter step portion 5b of the hub wheel 5 through a predetermined shimiro, and a predetermined bearing preload is applied by a caulking portion 9 formed by plastically deforming the end of the small-diameter step portion 5b. Is fixed in the axial direction. As a result, it is possible to provide a self-retaining structure that achieves light weight and compactness and that maintains the initially set preload for a long period of time.

ハブ輪５はＳ５３Ｃ等の炭素０．４０〜０．８０ｗｔ％を含む中高炭素鋼で形成され、後述するアウター側のシール１２が摺接する車輪取付フランジ７のインナー側の基部７ｃから内側転走面５ａ、軸状部８、および小径段部５ｂ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９は鍛造加工後の表面硬さのままとされている。これにより、車輪取付フランジ７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６の嵌合部となる小径段部５ｂの耐フレッティング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９の塑性加工をスムーズに行うことができる。なお、内輪６、ボール３および円錐ころ４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 5 is formed of medium-high carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, and the inner rolling surface from the inner side base portion 7c of the wheel mounting flange 7 to which the outer side seal 12 described later comes into sliding contact. The surface hardness is hardened to a range of 58 to 64 HRC by induction hardening over 5a, the shaft-like portion 8 and the small diameter step portion 5b. The caulking portion 9 is kept in the surface hardness after forging. Thereby, it has sufficient mechanical strength with respect to the rotational bending load applied to the wheel mounting flange 7, and the fretting resistance of the small-diameter step portion 5 b serving as the fitting portion of the inner ring 6 is improved, and caulking is performed. There is no generation of minute cracks or the like during processing, and the plastic processing of the crimped portion 9 can be performed smoothly. The inner ring 6, the ball 3 and the tapered roller 4 are made of high carbon chrome steel such as SUJ2, and are hardened in the range of 58 to 64HRC to the core by quenching.

外方部材２は、外周に懸架装置を構成するナックル（図示せず）に取り付けられるための車体取付フランジ２ｃを一体に有し、内周にハブ輪５の内側転走面５ａに対向するアウター側の円弧状の外側転走面２ａと、内輪６の内側転走面６ａに対向するインナー側のテーパ状の外側転走面２ｂが一体に形成されている。この外方部材２はＳ５３Ｃ等の炭素０．４０〜０．８０ｗｔ％を含む中高炭素鋼で形成され、複列の外側転走面２ａ、２ｂ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、両転走面２ａ、５ａおよび２ｂ、６ａ間に保持器１０、１１を介して複数のボール３および円錐ころ４が転動自在にそれぞれ収容されている。また、外方部材２と内方部材１との間に形成された環状空間の開口部にはシール１２および磁気エンコーダ１３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 integrally has a vehicle body mounting flange 2c to be attached to a knuckle (not shown) constituting a suspension device on the outer periphery, and an outer member facing the inner rolling surface 5a of the hub wheel 5 on the inner periphery. An arcuate outer rolling surface 2a on the side and an inner tapered outer rolling surface 2b facing the inner rolling surface 6a of the inner ring 6 are integrally formed. This outer member 2 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the double row outer rolling surfaces 2a and 2b have a surface hardness in the range of 58 to 64HRC by induction hardening. Has been cured. A plurality of balls 3 and tapered rollers 4 are accommodated between the rolling surfaces 2a, 5a and 2b, 6a via the cages 10 and 11, respectively, so as to roll freely. In addition, a seal 12 and a magnetic encoder 13 are attached to the opening 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 Prevents rainwater and dust from entering the bearing.

本実施形態は、インナー側の円錐ころ４のピッチ円直径ＰＣＤｉがアウター側のボール３のピッチ円直径ＰＣＤｏよりも小径に設定されている。これにより、外方部材２におけるインナー側の外径Ｄを小径に設定することができる。このように、インナー側の転動体として円錐ころ４を使用することにより、インナー側の転動体列の基本定格荷重を低下させることなくナックルサイズを小さくでき、装置の軽量・コンパクト化を図りつつ、インナー側の転動体列部分の剛性が高くなる。   In this embodiment, the pitch circle diameter PCDi of the inner side tapered roller 4 is set to be smaller than the pitch circle diameter PCDo of the outer side ball 3. Thereby, the outer diameter D of the inner side in the outer member 2 can be set to a small diameter. Thus, by using the tapered roller 4 as the inner side rolling element, the knuckle size can be reduced without reducing the basic load rating of the inner side rolling element row, and the device is lighter and more compact. The rigidity of the rolling element row portion on the inner side is increased.

また、ハブ輪５の軸状部８と内輪６が突き合わされる肩部８ａとの間の段部に面取り部８ｂが形成されている。そして、ハブ輪５のアウター側端部にすり鉢状の凹所１４が鍛造加工によって形成されている。この凹所１４の深さは、内側転走面５ａの溝底部から軸状部８を越えて面取り部８ｂ付近までとされ、ハブ輪５のアウター側端部が略均一な肉厚に形成されている。   Further, a chamfered portion 8b is formed at a step portion between the shaft-shaped portion 8 of the hub wheel 5 and the shoulder portion 8a with which the inner ring 6 is abutted. A mortar-shaped recess 14 is formed at the outer end of the hub wheel 5 by forging. The depth of the recess 14 is from the groove bottom portion of the inner rolling surface 5a to the vicinity of the chamfered portion 8b beyond the shaft-shaped portion 8, and the outer side end portion of the hub wheel 5 is formed with a substantially uniform thickness. ing.

ここで、車輪取付フランジ７にモーメント荷重が負荷された場合、アウター側の内側転走面５ａを起点としてハブ輪５が変形すると考えられるため、本実施形態では、この内側転走面５ａよりもアウター側の肉厚に着目した。車輪取付フランジ７の基部７ｃは所定の曲率半径からなる円弧面に形成されているが、ハブ輪５の剛性をＦＥＭ解析により求めた結果、この基部７ｃの最小肉厚ｔ１と、その部位の直径ｄ１との関係が０．２≦ｔ１／ｄ１≦０．３の範囲になるように設定されている。   Here, when a moment load is applied to the wheel mounting flange 7, it is considered that the hub wheel 5 is deformed starting from the inner rolling surface 5 a on the outer side. We focused on the outer wall thickness. The base portion 7c of the wheel mounting flange 7 is formed in an arc surface having a predetermined radius of curvature. As a result of obtaining the rigidity of the hub wheel 5 by FEM analysis, the minimum thickness t1 of the base portion 7c and the diameter of the portion are determined. The relationship with d1 is set to be in the range of 0.2 ≦ t1 / d1 ≦ 0.3.

また、内側転走面５ａにおけるボール３の接触角α方向の肉厚ｔ２と、その部位の直径（ボール接触径）ｄ２との関係が０．２≦ｔ２／ｄ２≦０．３の範囲になるように設定されている。基部７ｃおよび内側転走面５ａの肉厚ｔ１、ｔ２が、それぞれの部位の直径ｄ１、ｄ２の２０％未満になると変形が大きくなり所望の剛性が得られなくなる。一方、３０％を超えて厚肉に形成しても余り剛性の増加が認められず、反って重量アップを招来して好ましくないからである。これにより、高周波焼入れによってハブ輪５の外周面に焼割れが発生するのを防止することができると共に、使用条件に対応したハブ輪５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。   Further, the relationship between the thickness t2 of the ball 3 in the contact angle α direction on the inner rolling surface 5a and the diameter (ball contact diameter) d2 of the portion is in the range of 0.2 ≦ t2 / d2 ≦ 0.3. Is set to When the thicknesses t1 and t2 of the base portion 7c and the inner rolling surface 5a are less than 20% of the diameters d1 and d2 of the respective portions, the deformation becomes large and desired rigidity cannot be obtained. On the other hand, even if the thickness exceeds 30%, the rigidity is not increased so much that it is not preferable because the weight is increased. As a result, it is possible to prevent the outer peripheral surface of the hub wheel 5 from being cracked by induction hardening, and to achieve weight reduction while ensuring the strength and rigidity of the hub wheel 5 corresponding to the use conditions. Can do.

さらに本実施形態では、内輪６における内側転走面６ａの大径端（大鍔６ｂの高さ）は大端面６ｅから軸方向に５ｍｍ以上離間して形成されると共に、図２（ａ）に拡大して示すように、磁気エンコーダ１３が外嵌される内輪６の大鍔外径６ｄからインナー側に所定の段差δを介して小径部１５が形成されている。これにより、加締加工時に内輪６が径方向外方に押し広げられても大鍔外径６ｄに発生するフープ応力を低減することができると共に、大鍔６ｂに倒れが発生するのを抑制し、大鍔６ｂと円錐ころ４との良好な接触状態を確保することができる。   Furthermore, in this embodiment, the large diameter end (the height of the large flange 6b) of the inner rolling surface 6a in the inner ring 6 is formed 5 mm or more away from the large end surface 6e in the axial direction, and as shown in FIG. As shown in an enlarged manner, a small diameter portion 15 is formed through a predetermined step δ from the large flange outer diameter 6d of the inner ring 6 to which the magnetic encoder 13 is fitted to the inner side. Thereby, even when the inner ring 6 is pushed radially outward during caulking, the hoop stress generated in the outer diameter 6d of the large collar can be reduced, and the collapse of the large collar 6b can be suppressed. A good contact state between the large collar 6b and the tapered roller 4 can be ensured.

また、（ｂ）に示すように、小径段部５ｂの加締加工前の端部が中空状の円筒部１６に形成されると共に、内輪６の内径面（図中二点鎖線にて示す）１７がインナー側に向って小径となるテーパ面に形成されている。これにより、小径段部５ｂと内輪６とのシメシロがインナー側に行くに従って漸次増大し、加締部（図中二点鎖線にて示す）９の近傍の内輪緊迫力が増して小径段部５ｂの変形を抑えることができる。したがって、前述した内輪６の段差δと相俟って内輪固定力を増大させ、内輪６の大鍔外径６ｄに発生するフープ応力を低減させると共に、大鍔６ｂに倒れが発生するのを抑制することができる。なお、ここでは、内輪６の内径面１７をテーパ面に形成するようにしたが、これに限らず、内輪６が圧入される小径段部５ｂの外径面の方をテーパ面に形成しても良い。   Further, as shown in (b), the end portion of the small-diameter step portion 5b before caulking is formed in the hollow cylindrical portion 16, and the inner diameter surface of the inner ring 6 (indicated by a two-dot chain line in the figure). 17 is formed in the taper surface which becomes a small diameter toward an inner side. As a result, the squeeze between the small-diameter step portion 5b and the inner ring 6 gradually increases toward the inner side, and the inner ring pressing force in the vicinity of the crimping portion (indicated by a two-dot chain line in the figure) 9 increases, and the small-diameter step portion 5b Can be prevented from being deformed. Therefore, in combination with the step δ of the inner ring 6 described above, the inner ring fixing force is increased, the hoop stress generated in the outer diameter 6d of the inner ring 6 is reduced, and the occurrence of the collapse of the larger ring 6b is suppressed. can do. Here, the inner diameter surface 17 of the inner ring 6 is formed as a tapered surface. However, the present invention is not limited to this, and the outer diameter surface of the small diameter step portion 5b into which the inner ring 6 is press-fitted is formed as a tapered surface. Also good.

図３（ａ）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、（ｂ）は、（ａ）のハブ輪単体を示す縦断面図である。なお、本実施形態は、前述した実施形態（図１）と基本的には複列の転動体の構成が異なるだけで、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位には同じ符号を付けてその詳細な説明を省略する。   FIG. 3A is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention, and FIG. 3B is a longitudinal sectional view showing a single hub wheel of FIG. Note that this embodiment basically differs from the above-described embodiment (FIG. 1) only in the configuration of the double-row rolling elements, except for the same part, the same part, or the part having the same function. The same reference numerals are assigned 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１８と外方部材１９、および両部材１８、１９間に転動自在に収容された複列の円錐ころ２０、４とを備えている。内方部材１８は、ハブ輪２１と、このハブ輪２１に所定のシメシロを介して圧入された内輪６とからなる。   This wheel bearing device is for a driven wheel called a third generation, and has an inner member 18, an outer member 19, and a double-row tapered roller housed between the members 18 and 19 so as to roll freely. 20 and 4. The inner member 18 includes a hub ring 21 and an inner ring 6 that is press-fitted into the hub ring 21 through a predetermined shimiro.

ハブ輪２１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７を一体に有し、外周に一方（アウター側）のテーパ状の内側転走面２１ａと、この内側転走面２１ａから軸方向に延びる軸状部８を介して小径段部５ｂが形成されている。そして、内側転走面２１ａの大径側に円錐ころ２０を案内するための大鍔２１ｂが形成されている。   The hub wheel 21 integrally has a wheel mounting flange 7 for mounting a wheel (not shown) at one end portion, one (outer side) tapered inner rolling surface 21a on the outer periphery, and this inner rolling. A small-diameter step portion 5b is formed through an axial portion 8 extending in the axial direction from the surface 21a. And the large collar 21b for guiding the tapered roller 20 to the large diameter side of the inner side rolling surface 21a is formed.

外方部材１９は、外周に車体取付フランジ２ｃを一体に有し、内周にハブ輪２１の内側転走面２１ａに対向するアウター側のテーパ状の外側転走面１９ａと、内輪６の内側転走面６ａに対向するインナー側のテーパ状の外側転走面２ｂが一体に形成されている。この外方部材１９はＳ５３Ｃ等の炭素０．４０〜０．８０ｗｔ％を含む中高炭素鋼で形成され、複列の外側転走面１９ａ、２ｂ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、両転走面１９ａ、２１ａおよび２ｂ、６ａ間に保持器２２、１１を介して複列の円錐ころ２０、４が転動自在にそれぞれ収容されている。   The outer member 19 integrally has a vehicle body mounting flange 2 c on the outer periphery, and has an outer tapered outer rolling surface 19 a facing the inner rolling surface 21 a of the hub wheel 21 on the inner periphery, and an inner side of the inner ring 6. A tapered outer rolling surface 2b on the inner side facing the rolling surface 6a is integrally formed. This outer member 19 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the double row outer rolling surfaces 19a and 2b have a surface hardness in the range of 58 to 64HRC by induction hardening. Has been cured. And the double-row tapered rollers 20 and 4 are accommodated between the rolling surfaces 19a and 21a and 2b and 6a via the cages 22 and 11 so as to roll freely.

本実施形態は、インナー側の円錐ころ４のピッチ円直径ＰＣＤｉがアウター側の円推ころ２０のピッチ円直径ＰＣＤｏよりも小径に設定されている。このように、複列の転動体として円錐ころ２０、４を使用することにより一層剛性を高めると共に、各転動体列の基本定格荷重を増大させて軸受の長寿命化を図ることができる。   In this embodiment, the pitch circle diameter PCDi of the inner side tapered roller 4 is set to be smaller than the pitch circle diameter PCDo of the outer side circular thrust roller 20. As described above, by using the tapered rollers 20 and 4 as the double row rolling elements, the rigidity can be further improved, and the basic rated load of each rolling element row can be increased to extend the life of the bearing.

また、ハブ輪２１のアウター側端部にすり鉢状の凹所２３が鍛造加工によって形成されている。そして、この凹所２３の深さは内側転走面２１ａの小径端部付近までとされ、ハブ輪２１のアウター側端部が略均一な肉厚に形成されている。このハブ輪２１はＳ５３Ｃ等の炭素０．４０〜０．８０ｗｔ％を含む中高炭素鋼からなり、車輪取付フランジ７の基部７ｃから内側転走面２１ａ、軸状部８、および小径段部５ｂ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。   Further, a mortar-shaped recess 23 is formed in the outer side end of the hub wheel 21 by forging. The depth of the recess 23 extends to the vicinity of the small diameter end portion of the inner rolling surface 21a, and the outer side end portion of the hub wheel 21 is formed to have a substantially uniform thickness. The hub wheel 21 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and is formed from the base portion 7c of the wheel mounting flange 7 to the inner rolling surface 21a, the shaft-shaped portion 8, and the small diameter step portion 5b. As a result, the surface hardness is set to a range of 58 to 64 HRC by induction hardening.

ここで、本実施形態では、図３（ｂ）に示すように、内側転走面２１ａの大径側の肉厚ｔ３が、内側転走面２１ａの中央部の肉厚ｔ４よりも厚く形成されている。また、ハブ輪２１の剛性をＦＥＭ解析により求めた結果、各肉厚ｔ３、ｔ４と、それぞれの部位の直径ｄ３、ｄ４との関係が０．２≦ｔ３／ｄ３≦０．３、および０．２≦ｔ４／ｄ４≦０．３の範囲になるように設定されている。これにより、使用条件に対応したハブ輪２１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。なお、内側転走面２１ａにおける大径側の肉厚ｔ３および中央部の肉厚ｔ４が、それぞれの部位の直径ｄ３、ｄ４の２０％未満になると変形が大きくなり所望の剛性が得られない。一方、３０％を超えても余り剛性の増加が認められず、反って重量アップを招来して好ましくないからである。   Here, in this embodiment, as shown in FIG.3 (b), thickness t3 by the side of the large diameter of the inner side rolling surface 21a is formed more thickly than thickness t4 of the center part of the inner side rolling surface 21a. ing. Further, as a result of obtaining the rigidity of the hub wheel 21 by FEM analysis, the relationship between the thicknesses t3 and t4 and the diameters d3 and d4 of the respective portions is 0.2 ≦ t3 / d3 ≦ 0.3, and 0. It is set to be in the range of 2 ≦ t4 / d4 ≦ 0.3. Thereby, weight reduction can be achieved, ensuring the intensity | strength and rigidity of the hub wheel 21 corresponding to use conditions. Note that when the large-diameter side wall thickness t3 and the central wall thickness t4 of the inner raceway surface 21a are less than 20% of the diameters d3 and d4 of the respective portions, deformation becomes large and desired rigidity cannot be obtained. On the other hand, even if it exceeds 30%, the increase in rigidity is not recognized so much, which is undesirable because it causes an increase in weight.

こうした構成の車輪用軸受装置では、ハブ輪２１のアウター側端部が略均一な肉厚に形成され、内側転走面２１ａ部分の肉厚ｔ３、ｔ４が所定の範囲に設定されているので、装置の軽量・コンパクト化と高剛性化という相反する課題を同時に解決した車輪用軸受装置を提供することができる。   In the wheel bearing device having such a configuration, the outer side end portion of the hub wheel 21 is formed to have a substantially uniform thickness, and the thicknesses t3 and t4 of the inner rolling surface 21a portion are set within a predetermined range. It is possible to provide a wheel bearing device that simultaneously solves the conflicting problems of light weight, compactness, and high rigidity of the device.

さらに本実施形態では、前述した実施形態と同様、前述した内輪６の大鍔外径６ｄに段差δが形成されると共に、内輪６の内径面１７がインナー側に向って小径となるテーパ面に形成され、小径段部５ｂと内輪６とのシメシロがインナー側に行くに従って漸次増大させたので、加締加工による小径段部５ｂの変形を抑えつつ内輪固定力を増大させ、内輪６の大鍔外径６ｄに発生するフープ応力を低減させると共に、大鍔６ｂに倒れが発生するのを抑制することができる   Further, in the present embodiment, as in the above-described embodiment, a step δ is formed in the large collar outer diameter 6d of the inner ring 6 described above, and the inner surface 17 of the inner ring 6 has a tapered surface with a smaller diameter toward the inner side. Since the squeezing between the small-diameter step portion 5b and the inner ring 6 is gradually increased toward the inner side, the inner ring fixing force is increased while suppressing the deformation of the small-diameter step portion 5b due to the caulking process. While reducing the hoop stress generated in the outer diameter 6d, it is possible to suppress the collapse of the large collar 6b.

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、従動輪用の第３世代構造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 third-generation wheel bearing device for a driven wheel.

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. （ａ）は、図１の要部拡大図である。 （ｂ）は、（ａ）の加締前の要部拡大図である。(A) is a principal part enlarged view of FIG. (B) is a principal part enlarged view before the caulking of (a). （ａ）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。 （ｂ）は、（ａ）のハブ輪単体を示す縦断面図である。(A) is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. (B) is a longitudinal sectional view showing a single hub wheel of (a). 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.

符号の説明Explanation of symbols

１、１８・・・・・・・・・・・・・内方部材
２、１９・・・・・・・・・・・・・外方部材
３・・・・・・・・・・・・・・・・ボール
４、２０・・・・・・・・・・・・・円錐ころ
５、２１・・・・・・・・・・・・・ハブ輪
５ａ、６ａ、２１ａ・・・・・・・・内側転走面
５ｂ・・・・・・・・・・・・・・・小径段部
６・・・・・・・・・・・・・・・・内輪
６ｂ、２１ｂ・・・・・・・・・・・大鍔
６ｃ・・・・・・・・・・・・・・・小鍔
６ｄ・・・・・・・・・・・・・・・内輪の大鍔外径
６ｅ・・・・・・・・・・・・・・・内輪の大端面
７・・・・・・・・・・・・・・・・車輪取付フランジ
７ａ・・・・・・・・・・・・・・・ハブボルト
７ｂ・・・・・・・・・・・・・・・円孔
７ｃ・・・・・・・・・・・・・・・基部
８・・・・・・・・・・・・・・・・軸状部
８ａ・・・・・・・・・・・・・・・肩部
８ｂ・・・・・・・・・・・・・・・面取り部
９・・・・・・・・・・・・・・・・加締部
１０、１１、２２・・・・・・・・・保持器
１２・・・・・・・・・・・・・・・シール
１３・・・・・・・・・・・・・・・磁気エンコーダ
１４、２３・・・・・・・・・・・・凹所
１５・・・・・・・・・・・・・・・小径部
１６・・・・・・・・・・・・・・・円筒部
１７・・・・・・・・・・・・・・・内輪の内径面
５０・・・・・・・・・・・・・・・車輪用軸受装置
５１・・・・・・・・・・・・・・・外方部材
５１ａ・・・・・・・・・・・・・・アウター側の外側転走面
５１ｂ・・・・・・・・・・・・・・インナー側の外側転走面
５１ｃ・・・・・・・・・・・・・・車体取付フランジ
５２・・・・・・・・・・・・・・・ハブ輪
５２ａ、５４ａ・・・・・・・・・・内側転走面
５２ｂ・・・・・・・・・・・・・・小径段部
５２ｃ・・・・・・・・・・・・・・加締部
５３・・・・・・・・・・・・・・・車輪取付フランジ
５４・・・・・・・・・・・・・・・内輪
５５・・・・・・・・・・・・・・・内方部材
５６、５７・・・・・・・・・・・・ボール
５８、５９・・・・・・・・・・・・保持器
６０、６１・・・・・・・・・・・・シール
ｄ１・・・・・・・・・・・・・・・基部の直径
ｄ２・・・・・・・・・・・・・・・内側転走面のボール接触径
ｄ３・・・・・・・・・・・・・・・内側転走面における大径側の直径
ｄ４・・・・・・・・・・・・・・・内側転走面における中央部の直径
Ｄ１・・・・・・・・・・・・・・・アウター側のボールのピッチ円直径
Ｄ２・・・・・・・・・・・・・・・インナー側のボールのピッチ円直径
ＰＣＤｉ・・・・・・・・・・・・・インナー側の転動体のピッチ円直径
ＰＣＤｏ・・・・・・・・・・・・・アウター側の転動体のピッチ円直径
ｔ１・・・・・・・・・・・・・・・基部の最小肉厚
ｔ２・・・・・・・・・・・・・・・内側転走面におけるボールの接触角方向の肉厚
ｔ３・・・・・・・・・・・・・・・内側転走面における大径側の肉厚
ｔ４・・・・・・・・・・・・・・・内側転走面における中央部の肉厚
α・・・・・・・・・・・・・・・・接触角
δ・・・・・・・・・・・・・・・・段差 1, 18 ... Inner member 2, 19 ... Outer member 3 ... ... balls 4, 20 ... tapered rollers 5, 21 ... hub wheels 5a, 6a, 21a ... ... Inner rolling surface 5b ... Small diameter step 6 ... Inner ring 6b, 21b ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… Outer diameter 6e ·············· Large end surface 7 of the inner ring ·············· Wheel mounting flange 7a ···・ ・ ・ ・ ・ ・ ・ ・ Hub bolt 7b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Circular hole 7c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Part 8 ... Shaft 8a ... Shoulder 8b ...・ ・ ・ ・ ・ Chamfered part 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Clamping parts 10, 11, 22 ・ ・ ・ ・ ・ ・ ・ ・ Cage 12 ·············································································································・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small-diameter part 16 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cylindrical part 17 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring inner diameter Surface 50 ········· Wheel bearing device 51 ·············· Outside member 51a・ ・ ・ ・ ・ Outer rolling surface 51b on the outer side ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer rolling surface 51c on the inner side・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 52 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheels 52a, 54a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 52b ·············· Small diameter step 52c ..Wheel mounting flange 54 ... Inner ring 55 ... Inner members 56, 57 ...・ ・ ・ ・ ・ ・ Ball 58, 59 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Retainer 60, 61 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal d1・ ・ ・ ・ ・ ・ Diameter of base part d2 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Ball contact diameter of inner rolling surface d3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inside Diameter d4 on the large diameter side on the rolling surface ..... Inner rolling surface Diameter D1 of the central part in the outer diameter of the ball on the outer side D2 ... of the ball on the inner side Pitch circle diameter PCDi ......... Pitch circle diameter PCDo of the inner side rolling element ......... Pitch circle diameter t1 of the outer side rolling element・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Minimum thickness t2 at the base ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wall thickness t3 in the ball contact angle direction on the inner rolling surface ..... Thickness t4 on the large diameter side on the inner rolling surface ........ Thickness α ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Contact angle δ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Step

Claims (5)

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所定のシメシロを介して圧入され、外周に前記複列の外側転走面に対向する他方の内側転走面が形成された内輪からなる内方部材と、
この内方部材と前記外方部材の両転走面間に転動自在に収容された複列の転動体とを備え、
前記ハブ輪の小径段部を径方向外方に塑性変形させて形成した加締部によって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、
前記複列の転動体のうちインナー側の転動体が円錐ころで構成され、このインナー側の円錐ころのピッチ円直径が前記アウター側の転動体のピッチ円直径よりも小径に設定され、前記ハブ輪の軸状部と前記内輪と突き合わされる肩部との間の段部に面取り部が形成されると共に、前記ハブ輪の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内側転走面の溝底部を越えて前記面取り部付近とされ、前記内輪の外周にテーパ状の内側転走面と、この内側転走面の大径側に前記円錐ころを案内する大鍔が形成され、この大鍔外径からインナー側に所定の段差を介して小径部が形成されていることを特徴とする車輪用軸受装置。 An outer member integrally having a vehicle body mounting flange to be attached to the knuckle on the outer periphery, and a double row outer rolling surface formed on the inner periphery;
It has a wheel mounting flange for mounting a wheel at one end, and has one inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and a shaft-shaped portion from the inner rolling surface via the shaft-shaped portion. A hub wheel formed with a small-diameter step portion extending in the axial direction, and the other inner rolling member that is press-fitted into the small-diameter step portion of the hub wheel via a predetermined shimiro and faces the outer rolling surface of the double row on the outer periphery. An inner member comprising an inner ring having a surface formed thereon;
A double row rolling element housed in a freely rolling manner between the rolling surfaces of the inner member and the outer member;
In the wheel bearing device in which the inner ring is fixed in the axial direction by a caulking portion formed by plastically deforming a small-diameter step portion of the hub wheel radially outward,
The inner side rolling element of the double row rolling elements is constituted by a tapered roller, and the pitch circle diameter of the inner side tapered roller is set smaller than the pitch circle diameter of the outer side rolling element, and the hub A chamfered portion is formed at the step portion between the shaft-shaped portion of the ring and the shoulder portion that is abutted against the inner ring, and a mortar-shaped recess is formed at the outer end of the hub wheel. The depth of the place exceeds the groove bottom of the inner raceway surface of the hub wheel and is near the chamfered portion, and the inner raceway has a tapered inner raceway surface on the outer periphery of the inner race, and on the larger diameter side of the inner raceway surface. A wheel bearing device, wherein a large collar for guiding the tapered roller is formed, and a small diameter portion is formed from the outer diameter of the large collar to an inner side through a predetermined step. 前記内輪と小径段部とのシメシロがインナー側に行くに従って漸次増大している請求項１に記載の車輪用軸受装置。   The wheel bearing device according to claim 1, wherein the squeeze between the inner ring and the small-diameter step portion gradually increases toward the inner side. 前記内輪における内側転走面の大径端が当該内輪の大端面から軸方向に５ｍｍ以上離間して形成されている請求項１または２に記載の車輪用軸受装置。   3. The wheel bearing device according to claim 1, wherein a large-diameter end of an inner raceway surface in the inner ring is formed to be separated from the large end surface of the inner ring by 5 mm or more in the axial direction. 前記ハブ輪のアウター側の端部が前記凹所に対応して略均一な肉厚で所定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。 A bearing device for a wheel according to claims 1 to 3 or is set to a predetermined range substantially in uniform wall thickness end portion of the outer side in correspondence with the recess of the wheel hub. 前記ハブ輪の内側転走面の肉厚が、その部位の直径の０．２〜０．３の範囲に設定されている請求項４に記載の車輪用軸受装置。
The wheel bearing device according to claim 4, wherein a thickness of the inner raceway surface of the hub wheel is set in a range of 0.2 to 0.3 of a diameter of the portion.
JP2006173725A 2006-05-26 2006-06-23 Wheel bearing device Active JP5000206B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2006173725A JP5000206B2 (en) 2006-06-23 2006-06-23 Wheel bearing device
CN200780019433XA CN101454587B (en) 2006-05-26 2007-05-23 Bearing device for wheel
PCT/JP2007/000554 WO2007138740A1 (en) 2006-05-26 2007-05-23 Bearing device for wheel
DE112007001272.2T DE112007001272B4 (en) 2006-05-26 2007-05-23 Bearing device for a vehicle wheel
US12/277,427 US7641394B2 (en) 2006-05-26 2008-11-25 Bearing apparatus for a wheel of vehicle

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JP4019548B2 (en) * 1999-04-05 2007-12-12 日本精工株式会社 Rolling bearing unit for wheel support and manufacturing method thereof
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