JP5501595B2 - Wheel bearing device - Google Patents

Wheel bearing device Download PDF

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JP5501595B2
JP5501595B2 JP2008262344A JP2008262344A JP5501595B2 JP 5501595 B2 JP5501595 B2 JP 5501595B2 JP 2008262344 A JP2008262344 A JP 2008262344A JP 2008262344 A JP2008262344 A JP 2008262344A JP 5501595 B2 JP5501595 B2 JP 5501595B2
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wheel
retaining ring
bearing device
wheel bearing
rolling
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JP2010089663A (en
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貴之 小和田
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NTN Corp
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NTN Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C43/00—Assembling bearings
    • F16C43/04—Assembling rolling-contact bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/063—Fixing them on the shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
    • F16C19/383—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
    • F16C19/385—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings
    • F16C19/386—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings in O-arrangement
    • 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)
  • Mounting Of Bearings Or Others (AREA)
  • Rolling Contact Bearings (AREA)

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、内輪がハブ輪に加締固定されるセルフリテイン構造において、ハブ輪の内周に軸受固定用の止め輪溝が形成され、このハブ輪の加締部の強度・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 for rotatably supporting a wheel of an automobile or the like, in particular, in a self-retaining structure in which an inner ring is crimped and fixed to a hub ring, a retaining ring groove for fixing the bearing is provided on the inner periphery of the hub ring. The present invention relates to a wheel bearing device formed and designed to improve the strength and durability of the caulking portion of the hub wheel.

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、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。   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. This 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, and is an outer member. 2nd generation structure with body mounting flange or wheel mounting flange formed directly on the outer periphery of the wheel, 3rd generation structure with one inner rolling surface formed directly on the outer periphery of the hub wheel, or constant speed with the hub wheel 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 universal joint.

車輪は懸架装置に対して、複列の転がり軸受により回転自在に支承されるが、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から構成された車輪用軸受装置が使用されている。   The wheel is rotatably supported by a double-row rolling bearing with respect to the suspension system, but a wheel bearing device composed of double-row tapered roller bearings is used for off-road cars, trucks, and other vehicles that have a heavy body weight. Has been.

なお、こうした車輪用軸受装置において、内輪回転タイプのものでは、ハブ輪に嵌合される内輪を軸方向に固定する方式として、ハブ輪のインナー側の端部を加締めて固定するもの、所謂セルフリテイン構造が採用されている。図７にこの代表的な一例を示す。この車輪用軸受装置は第２世代と称され、ハブ輪５１と、このハブ輪５１に圧入された車輪用軸受５２とからなる。   In such a wheel bearing device, in the inner ring rotating type, as the method of fixing the inner ring fitted to the hub ring in the axial direction, the inner side end of the hub ring is swaged and fixed, so-called Self-retained structure is adopted. FIG. 7 shows a typical example of this. This wheel bearing device is referred to as a second generation, and includes a hub wheel 51 and a wheel bearing 52 press-fitted into the hub wheel 51.

ハブ輪５１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５３を一体に有し、外周にこの車輪取付フランジ５３から肩部５１ａを介して軸方向に延びる円筒状の小径段部５１ｂが形成され、内周にトルク伝達用のセレーション５１ｃが形成されている。車輪取付フランジ５３の周方向等配位置には車輪を固定するハブボルト５３ａが植設されている。   The hub wheel 51 integrally has a wheel mounting flange 53 for mounting a wheel (not shown) at one end, and has a small cylindrical diameter extending in the axial direction from the wheel mounting flange 53 via a shoulder 51a on the outer periphery. A step portion 51b is formed, and a serration 51c for torque transmission is formed on the inner periphery. Hub bolts 53 a for fixing the wheels are planted at the circumferentially equidistant positions of the wheel mounting flanges 53.

車輪用軸受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５４ｂを一体に有し、内周に複列のテーパ状の外側転走面５４ａ、５４ａが形成された外方部材５４と、外周に複列の外側転走面５４ａ、５４ａに対向するテーパ状の内側転走面５５ａが形成された一対の内輪５５、５５と、両転走面間に保持器５６を介して転動自在に収容された複列の円錐ころ５７、５７とを備えている。内輪５５の内側転走面５５ａの大径側には円錐ころ５７を案内するための大鍔部５５ｂが形成されると共に、小径側には円錐ころ５７の脱落を防止するための小鍔部５５ｃが形成され、一対の内輪５５、５５の小鍔部５５ｃ側の端面（正面側端面）が突き合された状態でセットされ、背面合せタイプの複列の円錐ころ軸受を構成している。   The wheel bearing 52 has a vehicle body mounting flange 54b integrally attached to a knuckle (not shown) on the outer periphery, and an outer surface in which double-row tapered outer rolling surfaces 54a and 54a are formed on the inner periphery. A pair of inner rings 55, 55 formed with a tapered member 54, a tapered inner rolling surface 55a facing the double row outer rolling surfaces 54a, 54a on the outer periphery, and a cage 56 between both rolling surfaces. And double-row tapered rollers 57, 57 accommodated so as to roll freely. A large collar portion 55b for guiding the tapered roller 57 is formed on the large diameter side of the inner raceway 55a of the inner ring 55, and a small collar portion 55c for preventing the tapered roller 57 from falling off on the small diameter side. Is formed in a state where the end surfaces (front side end surfaces) of the pair of inner rings 55 and 55 on the side of the small flange portion 55c are abutted to each other to constitute a back-to-back type double row tapered roller bearing.

車輪用軸受５２は、ハブ輪５１の肩部５１ａにアウター側の内輪５５の大端面５５ｄが衝合するように小径段部５１ｂに所定のシメシロを介して圧入されている。そして、小径段部５１ｂの端部を径方向外方に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。また、外方部材５４と一対の内輪５５、５５との間に形成される環状空間の開口部にはシール５９、５９が装着され、軸受内部に封入された潤滑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 wheel bearing 52 is press-fitted into the small-diameter step portion 51b through a predetermined squeezing so that the large end surface 55d of the outer inner ring 55 abuts on the shoulder portion 51a of the hub wheel 51. And it fixes to the axial direction with the crimping part 58 formed by carrying out the plastic deformation of the edge part of the small diameter step part 51b to radial direction outward. Also, seals 59, 59 are attached to the openings of the annular space formed between the outer member 54 and the pair of inner rings 55, 55, and leakage of the lubricating grease sealed inside the bearings to the outside, Prevents rainwater and dust from entering the bearing from the outside.

ここで、車輪取付フランジ５３の基部となる肩部５１ａから小径段部５１ｂに亙って高周波焼入れによって表面硬さが５０〜６４ＨＲＣの範囲に所定の硬化層６０が形成されている。なお、加締部５８は鍛造後の表面硬さのままとされている。   Here, a predetermined hardened layer 60 is formed in a range of surface hardness of 50 to 64 HRC by induction hardening from the shoulder 51a serving as the base of the wheel mounting flange 53 to the small diameter step 51b. The caulking portion 58 is kept at the surface hardness after forging.

この硬化層６０は、図８に示すように、インナー側の端部位置Ｐが、内輪５５における面取り部５５ｅの縁部Ｐ０から大鍔部５５ｂの高さ（大鍔部５５ｂの根元部）ａに対応する位置Ｐ１までの範囲に設定されている。これにより、内輪５５、５５の嵌合面におけるフレッティング摩耗が抑制されてハブ輪５１の耐久性が向上すると共に、ハブ輪５１における小径段部５１ｂの端部の拡径量を小さくすることができ、加締加工に伴う内輪５５の内側転走面５５ａおよび大鍔部５５ｂの変形を抑制することができる。したがって、円錐ころ５７との接触面圧を抑えてスムーズな案内を確保し、内輪５５の耐久性の向上を図ることができる。   As shown in FIG. 8, the hardened layer 60 has an inner end portion position P at the height of the large collar portion 55b from the edge portion P0 of the chamfered portion 55e of the inner ring 55 (the root portion of the large collar portion 55b) a. Is set to a range up to a position P1 corresponding to. Thereby, fretting wear on the fitting surfaces of the inner rings 55, 55 is suppressed, the durability of the hub wheel 51 is improved, and the diameter expansion amount of the end portion of the small diameter step portion 51b in the hub wheel 51 can be reduced. It is possible to suppress deformation of the inner rolling surface 55a and the large collar portion 55b of the inner ring 55 due to the caulking process. Therefore, the contact surface pressure with the tapered roller 57 can be suppressed to ensure smooth guidance, and the durability of the inner ring 55 can be improved.

また、内輪５５における面取り部５５ｅの曲率半径ｒがＲ１．０〜２．５の範囲に設定されている。これにより、曲げモーメント荷重が装置に負荷された時、加締部５８の根元部分に応力集中が起こるのを防止すると共に、加締加工による小径段部５１ｂの拡径量が大きくなって内輪５５の外径に過大なフープ応力が発生するのを防止することができ、内輪５５の強度・耐久性を向上させることができる。   Further, the radius of curvature r of the chamfered portion 55e in the inner ring 55 is set in a range of R1.0 to 2.5. As a result, when a bending moment load is applied to the apparatus, stress concentration is prevented from occurring at the root portion of the caulking portion 58, and the amount of diameter expansion of the small diameter step portion 51b due to caulking is increased, thereby increasing the inner ring 55. It is possible to prevent an excessive hoop stress from being generated on the outer diameter of the inner ring 55 and to improve the strength and durability of the inner ring 55.

さらに、ハブ輪５１における小径段部５１ｂの端部には環状の凹所６１が形成されている。この凹所６１は、内輪５５の大端面（インナー側の端面）５５ｄからｂ（５ｍｍ以下）になるように形成されている。これにより、ハブ輪５１の強度・剛性を維持しつつ所定の内輪固定力を確保できると共に、塑性変形を容易にし、内輪５５に発生するフープ応力を抑制することができる。
特開２００７−２９２１８４号公報 Further, an annular recess 61 is formed at the end of the small diameter step portion 51 b in the hub wheel 51. The recess 61 is formed to be b (5 mm or less) from the large end surface (end surface on the inner side) 55d of the inner ring 55. Accordingly, a predetermined inner ring fixing force can be secured while maintaining the strength and rigidity of the hub ring 51, plastic deformation can be facilitated, and hoop stress generated in the inner ring 55 can be suppressed.
JP 2007-292184 A

このような従来の車輪用軸受装置では、内輪５５の嵌合面におけるフレッティング摩耗が抑制されてハブ輪５１の耐久性が向上すると共に、ハブ輪５１における小径段部５１ｂの端部の拡径量を小さくすることができ、加締加工に伴う内輪５５の内側転走面５５ａおよび大鍔部５５ｂの変形を抑制することができる。然しながら、図９に示すような、ハブ輪５１の内周面に転がり軸受６２が嵌合されるような仕様では、加締部５８の近傍に転がり軸受６２を位置決め固定する止め輪６３が装着されている。このような車輪用軸受装置は、２ＷＤ（２輪駆動）と４ＷＤ（４輪駆動）との切り換えが可能なパートタイム４ＷＤ車用とした仕様で、ハブ輪６４の中心に駆動軸（図示せず）が挿入されている。駆動軸は、ハブ輪６４の内周に嵌合された転がり軸受６２によってハブ輪６４に対して回転自在に支承される。そして、図示しないクラッチ機構を介して、駆動軸とハブ輪６４とが断続自在に構成される。   In such a conventional wheel bearing device, fretting wear on the fitting surface of the inner ring 55 is suppressed, the durability of the hub wheel 51 is improved, and the diameter of the end portion of the small-diameter step portion 51b in the hub wheel 51 is increased. The amount can be reduced, and deformation of the inner rolling surface 55a and the large collar portion 55b of the inner ring 55 accompanying caulking can be suppressed. However, in the specification in which the rolling bearing 62 is fitted to the inner peripheral surface of the hub wheel 51 as shown in FIG. 9, a retaining ring 63 for positioning and fixing the rolling bearing 62 is mounted in the vicinity of the caulking portion 58. ing. Such a wheel bearing device is designed for a part-time 4WD vehicle that can be switched between 2WD (2-wheel drive) and 4WD (4-wheel drive), and has a drive shaft (not shown) at the center of the hub wheel 64. ) Is inserted. The drive shaft is rotatably supported with respect to the hub wheel 64 by a rolling bearing 62 fitted to the inner periphery of the hub wheel 64. The drive shaft and the hub wheel 64 are configured to be intermittently connected via a clutch mechanism (not shown).

この種のハブ輪６４では、図１０に示すように、小径段部６４ａの端部が、円筒部６５として形成され、車輪用軸受５２を組立後、加締用治具６６によってハブ輪６４の小径段部６４ａが揺動加締されるが、この場合、図１１に示すように、内周面に形成された止め輪溝６７を起点としてクラック６８が発生する恐れがある。このクラック６８は、目視検査では発見しずらい部位であると共に、微小なクラック６８が運転中に成長し、加締部５８が脱落して重大欠陥を誘発させることがあるため、止め輪溝６７の加工や、加工後の検査には慎重、かつ、入念な配慮が必要であった。したがって、ハブ輪６４の加工工程および加締工程に多大な時間を要し、工程能力が低下して製造コストが高騰するという問題があった。   In this type of hub wheel 64, as shown in FIG. 10, the end portion of the small diameter step portion 64 a is formed as a cylindrical portion 65, and after assembling the wheel bearing 52, the caulking jig 66 is used to assemble the hub wheel 64. The small-diameter stepped portion 64a is rocked and swaged. In this case, as shown in FIG. 11, there is a possibility that a crack 68 may be generated starting from a retaining ring groove 67 formed on the inner peripheral surface. The crack 68 is a portion that is difficult to find by visual inspection, and the minute crack 68 grows during operation, and the caulking portion 58 may fall off and induce a serious defect. Careful and careful consideration was necessary for the processing and inspection after processing. Therefore, a great amount of time is required for the processing step and the caulking step of the hub wheel 64, resulting in a problem that the process capability is reduced and the manufacturing cost is increased.

本発明は、このような事情に鑑みてなされたもので、内輪がハブ輪に加締固定され、このハブ輪の内周に軸受固定用の止め輪溝が形成されたセルフリテイン構造において、加締加工時に止め輪溝を起点に発生するクラックを防止し、加締部の強度を確保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. In a self-retaining structure in which an inner ring is swaged and fixed to a hub ring and a retaining ring groove for fixing a bearing is formed on the inner periphery of the hub ring, An object of the present invention is to provide a wheel bearing device in which cracks generated from a retaining ring groove at the time of tightening are prevented and the strength of a caulking portion is ensured.

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、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所定のシメシロを介して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、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開口部に装着されたシールとを備え、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ハブ輪に対して前記内輪が固定されると共に、前記ハブ輪の内周に転がり軸受が嵌合され、この転がり軸受が止め輪によって位置決め固定された車輪用軸受装置において、前記小径段部の加締加工前の端部外周に環状溝が形成され、この環状溝が前記内輪のインナー側の内径端部から大端面を越えて形成され、当該環状溝の両端部が円弧面で形成され、前記加締部の近傍に前記止め輪を装着するための止め輪溝が形成されると共に、この止め輪溝の隅部のうち少なくともアウター側の隅部が円弧面に形成され、この円弧面の曲率半径が、当該止め輪溝の深さの０．５〜１．５の範囲に設定され、かつ前記止め輪溝のインナー側の隅部が前記環状溝のアウター側の円弧面と軸方向位置で重なるように形成されている。 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 attachment for attaching a wheel to one end. A hub ring having a flange integrally formed with a small-diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small-diameter step portion of the hub ring via a predetermined shimiro, An inner member in which a double row inner rolling surface facing the outer row rolling surface of the double row is formed, and rolling between the both rolling surfaces of the inner member and the outer member via a cage. A double row rolling element accommodated freely, and a seal attached to an opening of an annular space formed between the outer member and the inner member, and the end of the small-diameter stepped portion having a diameter The inner ring is fixed to the hub ring by a caulking portion formed by plastic deformation outward in the direction. In a wheel bearing device in which a rolling bearing is fitted to the inner periphery of the hub ring and the rolling bearing is positioned and fixed by a retaining ring, an annular groove is formed on the outer periphery of the end portion of the small diameter step portion before caulking. In order to mount the retaining ring in the vicinity of the caulking portion, the annular groove is formed from the inner diameter inner side end portion of the inner ring to the large end surface, and both end portions of the annular groove are formed by arcuate surfaces. The retaining ring groove is formed, and at least the outer corner of the retaining ring groove is formed in an arcuate surface, and the radius of curvature of the arcuate surface is 0. 0 of the depth of the retaining ring groove . It is set in the range of 5 to 1.5 , and the inner side corner of the retaining ring groove is formed so as to overlap the arc surface on the outer side of the annular groove at the axial position .

このように、ハブ輪の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が固定されると共に、ハブ輪の内周に転がり軸受が嵌合され、この転がり軸受が止め輪によって位置決め固定された車輪用軸受装置において、小径段部の加締加工前の端部外周に環状溝が形成され、この環状溝が内輪のインナー側の内径端部から大端面を越えて形成され、当該環状溝の両端部が円弧面で形成され、加締部の近傍に止め輪を装着するための止め輪溝が形成されると共に、この止め輪溝の隅部のうち少なくともアウター側の隅部が円弧面に形成され、この円弧面の曲率半径が、当該止め輪溝の深さの０．５〜１．５の範囲に設定され、かつ止め輪溝のインナー側の隅部が環状溝のアウター側の円弧面と軸方向位置で重なるように形成されているので、加締加工時に小径段部の端部が塑性変形され、止め輪溝の隅部に引張応力が生じても、ここを起点にクラックが発生するのを防止することができ、加締部の強度を確保し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 by the caulking portion formed by plastically deforming the end of the small diameter step portion of the hub ring radially outward, and the rolling bearing is provided on the inner periphery of the hub ring. In a wheel bearing device that is fitted and the rolling bearing is positioned and fixed by a retaining ring, an annular groove is formed on the outer periphery of the end of the small-diameter step portion before caulking, and this annular groove is formed on the inner diameter of the inner ring of the inner ring. Formed from the end to the large end surface , both end portions of the annular groove are formed by circular arc surfaces, and a retaining ring groove for attaching a retaining ring is formed in the vicinity of the caulking portion. At least the outer corner is formed on the arc surface, the radius of curvature of the arc surface is set in the range of 0.5 to 1.5 of the depth of the retaining ring groove , and the retaining ring The inner corner of the groove overlaps with the outer circular arc surface of the annular groove at the axial position. Because it is formed so that an end portion of the cylindrical portion at the time of caulking is plastically deformed, even if tensile stress is generated in the corner portion of the snap ring groove, preventing occurrence of cracks in the starting point here Therefore, it is possible to provide a wheel bearing device in which the strength of the caulking portion is ensured.

また、請求項２に記載の発明のように、前記止め輪溝の両隅部が円弧面に形成され、これらの円弧面の曲率半径が、当該止め輪溝の深さと略同一に設定されていれば、止め輪溝の隅部に引張応力が生じても、ここを起点にクラックが発生するのを一層防止することができる。   Further, as in the second aspect of the present invention, both corners of the retaining ring groove are formed in an arc surface, and the radius of curvature of these arc surfaces is set to be substantially the same as the depth of the retaining ring groove. Then, even if a tensile stress is generated at the corner portion of the retaining ring groove, it is possible to further prevent cracks from occurring.

また、請求項３に記載の発明のように、前記止め輪溝の隅部のうちインナー側の隅部に丸ヌスミが形成されていれば、止め輪溝の隅部の切欠き感度を抑えることができ、加締加工時に小径段部の端部が塑性変形された時、止め輪溝の隅部の応力集中を緩和し、ここを起点にクラックが発生するのを一層防止することができる。   Further, as in the invention described in claim 3, if a round paste is formed at the inner corner of the retaining ring groove, the notch sensitivity at the corner of the retaining ring groove is suppressed. When the end of the small-diameter step portion is plastically deformed during caulking, stress concentration at the corner of the retaining ring groove can be relaxed, and cracks can be further prevented from occurring.

また、請求項４に記載の発明のように、前記止め輪溝が加締加工後に形成されていれば、加締加工時、止め輪溝の隅部に引張応力が生じるのを防止し、ここを起点にクラックが発生するのを確実に防止することができる。   Further, if the retaining ring groove is formed after the caulking process as in the invention described in claim 4, it is possible to prevent a tensile stress from being generated at the corner of the retaining ring groove during the caulking process. It is possible to reliably prevent cracks from starting.

また、請求項５に記載の発明のように、前記小径段部の加締加工前の端部が先端に向って漸次薄肉となる円筒状に形成され、前記環状溝の深さが０．５〜１．０ｍｍの範囲に形成されていれば、加締加工時に端部が変形し易くなり内輪の変形を抑えることができる。 Further, as in the invention described in claim 5, the end portion of the small-diameter step portion before caulking is formed in a cylindrical shape that gradually becomes thinner toward the tip, and the depth of the annular groove is 0.5. If it is formed in a range of ˜1.0 mm, the end portion is easily deformed during caulking and deformation of the inner ring can be suppressed.

好ましくは、請求項６に記載の発明のように、前記環状溝の両端部に所定の曲率半径Ｒｉ、Ｒｏからなる円弧面が形成され、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、アウター側の円弧面の曲率半径Ｒｏよりも小さく設定され（ｒ１≦Ｒｉ≦Ｒｏ）、ＲｉがＲ１〜１０の範囲に設定されていれば、所望の内輪内輪固定力が得られる。   Preferably, as in the invention described in claim 6, arcuate surfaces having predetermined radii of curvature Ri and Ro are formed at both ends of the annular groove, and the radius of curvature Ri of the inner-side arcuate surface is determined by the inner ring. If the radius of curvature of the chamfered portion is larger than the radius r1 and smaller than the radius of curvature Ro of the outer arc surface (r1 ≦ Ri ≦ Ro), and Ri is set in the range of R1-10, the desired inner ring inner ring Fixing force can be obtained.

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所定のシメシロを介して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、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開口部に装着されたシールとを備え、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ハブ輪に対して前記内輪が固定されると共に、前記ハブ輪の内周に転がり軸受が嵌合され、この転がり軸受が止め輪によって位置決め固定された車輪用軸受装置において、前記小径段部の加締加工前の端部外周に環状溝が形成され、この環状溝が前記内輪のインナー側の内径端部から大端面を越えて形成され、当該環状溝の両端部が円弧面で形成され、前記加締部の近傍に前記止め輪を装着するための止め輪溝が形成されると共に、この止め輪溝の隅部のうち少なくともアウター側の隅部が円弧面に形成され、この円弧面の曲率半径が、当該止め輪溝の深さの０．５〜１．５の範囲に設定され、かつ前記止め輪溝のインナー側の隅部が前記環状溝のアウター側の円弧面と軸方向位置で重なるように形成されているので、加締加工時に小径段部の端部が塑性変形され、止め輪溝の隅部に引張応力が生じても、ここを起点にクラックが発生するのを防止することができ、加締部の強度を確保し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 formed with a small-diameter step portion extending in the axial direction, and at least one inner ring press-fitted into the small-diameter step portion of the hub ring via a predetermined shimoshiro, and on the outer periphery of the double-row outer rolling surface 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. A moving body and a seal attached to an opening of an annular space formed between the outer member and the inner member, and formed by plastically deforming an end of the small-diameter stepped portion radially outward. The inner ring is fixed to the hub ring by the crimped portion, and rolled to the inner periphery of the hub ring. In the wheel bearing device in which the bearing is fitted and the rolling bearing is positioned and fixed by the retaining ring, an annular groove is formed on the outer periphery of the end portion of the small diameter step portion before caulking, and the annular groove is formed on the inner ring. It is formed from the inner diameter end portion on the inner side beyond the large end surface , both end portions of the annular groove are formed as arc surfaces, and a retaining ring groove for mounting the retaining ring is formed in the vicinity of the caulking portion. In addition, at least the outer-side corner of the retaining ring groove is formed in an arc surface, and the radius of curvature of the arc surface is in the range of 0.5 to 1.5 of the depth of the retaining ring groove. Since the inner ring-side corner of the retaining ring groove overlaps with the outer circular arc surface of the annular groove at the axial position, the end of the small-diameter step is plastic during caulking Even if it is deformed and tensile stress is generated at the corner of the retaining ring groove, Cracks can be prevented from occurring, it is possible to provide a wheel bearing apparatus that ensures the strength of the caulking portion.

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、内周にそれぞれ外向きに開いたテーパ状の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部が形成された一対の内輪からなる内方部材と、前記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円錐ころと、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開口部に装着されたシールとを備え、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ハブ輪に対して前記内輪が固定されると共に、前記ハブ輪の内周に転がり軸受が嵌合され、この転がり軸受が止め輪によって位置決め固定された車輪用軸受装置において、前記小径段部の加締加工前の端部外周に環状溝が形成され、この環状溝が、前記内輪のインナー側の内径端部から大端面を越えて形成され、深さが０．５〜１．０ｍｍの範囲に形成されると共に、前記加締部の近傍に前記止め輪を装着するための止め輪溝が形成され、この止め輪溝の隅部のうち少なくともアウター側の隅部が円弧面に形成され、この円弧面の曲率半径が、当該止め輪溝の深さの０．５〜１．５の範囲に設定されている。   An outer member that integrally has a vehicle body mounting flange for attaching to a knuckle on the outer periphery, and has a tapered double row outer rolling surface that is open outwardly on the inner periphery, and one end portion A hub wheel integrally having a wheel mounting flange for mounting a wheel and having a small-diameter step portion extending in an axial direction from the wheel mounting flange on the outer periphery, and a small-diameter step portion of the hub wheel via a predetermined shimiro A pair of inner rings that are press-fitted and have a tapered inner rolling surface facing the outer rolling surface of the double row on the outer periphery and a large collar portion that guides the tapered roller on the larger diameter side of the inner rolling surface. An annular member formed between the outer member and the inner member, a double-row tapered roller housed in a rollable manner between the both rolling surfaces via a cage. And an end portion of the small diameter step portion with a diameter. The inner ring is fixed to the hub ring by a caulking portion formed by plastic deformation outward, and a rolling bearing is fitted to the inner periphery of the hub ring, and the rolling bearing is positioned by a retaining ring. In the fixed wheel bearing device, an annular groove is formed on the outer periphery of the end portion of the small diameter step portion before caulking, and the annular groove is formed from the inner diameter end portion of the inner ring to the large end surface. And a depth of 0.5 to 1.0 mm, and a retaining ring groove for mounting the retaining ring is formed in the vicinity of the caulking portion. Of these, at least the outer-side corner is formed in an arc surface, and the radius of curvature of the arc surface is set in the range of 0.5 to 1.5 of the depth of the retaining ring groove.

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は、図１の加締部を示す要部拡大図、図３は、図２の止め輪溝の変形例を示す要部拡大図、図４は、図２の止め輪溝の他の変形例を示す要部拡大図、図５は、図２のさらに他の変形例を示す要部拡大図である。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, FIG. 2 is an enlarged view of a main part showing a caulking portion of FIG. 1, and FIG. 3 is a retaining ring of FIG. FIG. 4 is an enlarged view of a main part showing another modification of the retaining ring groove of FIG. 2, and FIG. 5 is an enlarged view of a main part showing still another modification of FIG. FIG. 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駆動輪側の第２世代構造をなし、ハブ輪１と、このハブ輪１に圧入された車輪用軸受２とからなる。ハブ輪１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３を一体に有し、外周に肩部１ａを介して軸方向に延びる円筒状の小径段部１ｂが形成され、内周にはトルク伝達用のセレーション（またはスプライン）１ｃが形成されている。また、車輪取付フランジ３の周方向等配位置に車輪を固定するハブボルト３ａが植設されている。   This wheel bearing device has a second generation structure on the drive wheel side, and includes a hub wheel 1 and a wheel bearing 2 press-fitted into the hub wheel 1. The hub wheel 1 integrally has a wheel mounting flange 3 for attaching a wheel (not shown) to an end portion on the outer side, and a cylindrical small-diameter step portion 1b extending in the axial direction on the outer periphery via a shoulder portion 1a. A serration (or spline) 1c for torque transmission is formed on the inner periphery. Further, hub bolts 3 a for fixing the wheels at the circumferentially equidistant positions of the wheel mounting flange 3 are planted.

車輪用軸受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４ｂを一体に有し、内周に複列のテーパ状の外側転走面４ａ、４ａが一体に形成された外方部材４と、外周に複列の外側転走面４ａ、４ａに対向するテーパ状の内側転走面５ａが形成された一対の内輪５、５と、両転走面間に保持器６を介して転動自在に収容された複列の円錐ころ７、７とを備えている。内輪５の内側転走面５ａの大径側には円錐ころ７を案内するための大鍔部５ｂが形成されると共に、小径側には円錐ころ７の脱落を防止するための小鍔部５ｃが形成され、一対の内輪５、５の小鍔部５ｃ側の端面（正面側端面）が突き合された状態でセットされた背面合せタイプの複列の円錐ころ軸受を構成している。   The wheel bearing 2 has a vehicle body mounting flange 4b integrally attached to a knuckle (not shown) on the outer periphery, and double row tapered outer rolling surfaces 4a and 4a are integrally formed on the inner periphery. The outer member 4, a pair of inner rings 5, 5 each having a tapered inner rolling surface 5a facing the outer circumferential rolling surfaces 4a, 4a in a double row on the outer periphery, and a cage between both rolling surfaces. 6 are provided with double-row tapered rollers 7 and 7 accommodated so as to be able to roll through 6. A large flange portion 5b for guiding the tapered roller 7 is formed on the large diameter side of the inner raceway 5a of the inner ring 5, and a small flange portion 5c for preventing the tapered roller 7 from falling off on the small diameter side. Is formed, and a back-to-back type double row tapered roller bearing is set in a state in which the end surfaces (front-side end surfaces) of the pair of inner rings 5 and 5 on the small flange portion 5c side are abutted.

外方部材４および内輪５、５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。なお、外方部材４は、高炭素クロム鋼に限らず、Ｓ５３Ｃ等の炭素０．４０〜０．８０ｗｔ％を含む中高炭素鋼（ＪＩＳ規格のＳＣ系機械構造用炭素鋼）で形成し、複列の外側転走面４ａ、４ａを高周波焼入れによって５８〜６４ＨＲＣの範囲に表面を硬化処理しても良い。   The outer member 4 and the inner rings 5 and 5 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. The outer member 4 is not limited to high carbon chrome steel, but is formed of medium to high carbon steel (carbon steel for SC system mechanical structure of JIS standard) containing 0.40 to 0.80 wt% of carbon such as S53C. The outer rolling surfaces 4a and 4a of the rows may be hardened by induction hardening in the range of 58 to 64 HRC.

ハブ輪１はＳ５３Ｃ等の炭素０．４０〜０．８０ｗｔ％を含む中高炭素鋼で形成され、車輪取付フランジ３の基部となる肩部１ａから小径段部１ｂに亙って高周波焼入れによって表面硬さが５０〜６４ＨＲＣの範囲に硬化処理が施されている。なお、加締部８は鍛造後の表面硬さ２５ＨＲＣ以下の生のままとされている。   The hub wheel 1 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and is hardened by induction hardening from the shoulder portion 1a serving as the base of the wheel mounting flange 3 to the small diameter step portion 1b. Is cured in the range of 50 to 64 HRC. In addition, the caulking part 8 is left raw with a surface hardness of 25 HRC or less after forging.

外方部材４と内輪５、５との間に形成される環状空間の開口部にはシール９、９が装着されている。これらシール９、９は、断面が略Ｌ字状に形成されて互いに対向配置された環状のシール板１０とスリンガ１１とからなる、所謂パックシールを構成し、軸受内部に封入された潤滑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。   Seals 9 and 9 are attached to the opening of the annular space formed between the outer member 4 and the inner rings 5 and 5. These seals 9 and 9 constitute a so-called pack seal comprising an annular seal plate 10 and a slinger 11 which are substantially L-shaped in cross section and arranged to face each other, and are made of lubricating grease sealed inside the bearing. This prevents leakage to the outside and intrusion of rainwater and dust from the outside into the bearing.

車輪用軸受２は、ハブ輪１の肩部１ａにアウター側の内輪５の大端面５ｄが衝合するように小径段部１ｂに所定のシメシロを介して圧入されている。そして、小径段部１ｂの端部を径方向外方に塑性変形させて形成した加締部８によって所定の予圧が付与された状態で固定されている。これにより、従来のように、ナットの締付トルク等を調整して予圧を管理することなく、長期間に亘って安定した予圧を維持できるセルフリテイン構造を提供することができる。また、本実施形態では、ハブ輪１の内周面に深溝玉軸受からなる転がり軸受１２が嵌合され、加締部８の近傍に転がり軸受１２を位置決め固定する止め輪１３が装着されている。なお、ここでは、転動体が円錐ころから複列円錐ころ軸受を例示したが、本発明に係る車輪用軸受装置はこれに限らず、例えば、図示はしないが、転動体にボールを用いた複列アンギュラ玉軸受であっても良い。   The wheel bearing 2 is press-fitted into the small-diameter step portion 1b via a predetermined squeeze so that the large end surface 5d of the inner ring 5 on the outer side abuts on the shoulder portion 1a of the hub wheel 1. And it fixes in the state to which the predetermined preload was provided by the crimping part 8 formed by carrying out the plastic deformation of the edge part of the small diameter step part 1b to radial direction outward. As a result, it is possible to provide a self-retain structure that can maintain a stable preload over a long period of time without adjusting the preload by adjusting the tightening torque of the nut or the like as in the prior art. In the present embodiment, a rolling bearing 12 made of a deep groove ball bearing is fitted to the inner peripheral surface of the hub wheel 1, and a retaining ring 13 for positioning and fixing the rolling bearing 12 is mounted in the vicinity of the caulking portion 8. . Here, the rolling element has been exemplified as a double row tapered roller bearing from a tapered roller, but the wheel bearing device according to the present invention is not limited to this. For example, although not shown, a double bearing using a ball as the rolling element is used. A row angular contact ball bearing may be used.

ここで、図２に示すように、加締加工前の小径段部１ｂの端部は先端に向って漸次薄肉となる円筒状に形成され、外周に環状溝１４が形成されている。この環状溝１４は、内輪５におけるインナー側の内径端部から大端面５ｄを越えて形成され、深さｎ＝０．５〜１．０ｍｍの範囲に形成されると共に、両端部に所定の曲率半径Ｒｉ、Ｒｏからなる円弧面１４ａ、１４ｂが形成されている。インナー側の円弧面１４ａの曲率半径Ｒｉは、内輪５の面取り部５ｄの曲率半径ｒ１よりも大きく、アウター側の円弧面１４ｂの曲率半径Ｒｏよりも小さく設定され（ｒ１≦Ｒｉ≦Ｒｏ）、ＲｉがＲ１〜１０の範囲に設定されている。   Here, as shown in FIG. 2, the end portion of the small-diameter step portion 1b before caulking is formed in a cylindrical shape that gradually becomes thinner toward the tip, and an annular groove 14 is formed on the outer periphery. The annular groove 14 is formed from the inner diameter inner side end portion of the inner ring 5 beyond the large end surface 5d, is formed in a depth n = 0.5 to 1.0 mm, and has a predetermined curvature at both end portions. Arc surfaces 14a and 14b having radii Ri and Ro are formed. The curvature radius Ri of the inner arcuate surface 14a is set to be larger than the curvature radius r1 of the chamfered portion 5d of the inner ring 5 and smaller than the curvature radius Ro of the outer arcuate surface 14b (r1 ≦ Ri ≦ Ro), Ri. Is set in the range of R1-10.

このように、小径段部１ｂの端部外周に環状溝１４を形成することにより、加締加工時に端部が変形し易くなり内輪５の変形を抑えることができる。ただし、環状溝１４の深さｎが０．５ｍｍよりも小さいとその効果が薄れ、また、深さｎ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５の固定力が得られない。   Thus, by forming the annular groove 14 on the outer periphery of the end of the small-diameter stepped portion 1b, the end is easily deformed during the caulking process, and deformation of the inner ring 5 can be suppressed. However, if the depth n of the annular groove 14 is smaller than 0.5 mm, the effect is reduced. If the depth n exceeds 1.0 mm, the inner ring push-in amount (clamping force) is insufficient and the desired inner ring. A fixing force of 5 cannot be obtained.

また、小径段部１ｂの端部の内周に止め輪溝１５が形成されている。この止め輪溝１５は、断面が矩形状に形成されると共に、アウター側の隅部が円弧面に形成されている。この円弧面の曲率半径Ｒ１は、通常０．６ｍｍ以下に規制されているが、ここでは、止め輪溝１５の深さｔ（２．０〜３．０ｍｍ）の０．５〜１．５（１．０〜４．５ｍｍ）の範囲に設定されている。これにより、加締加工時に小径段部１ｂの端部が塑性変形され（図中２点鎖線にて示す）、止め輪溝１５の隅部に引張応力が生じても、ここを起点にクラックが発生するのを防止することができ、加締部８の強度を確保した車輪用軸受装置を提供することができる。   A retaining ring groove 15 is formed on the inner periphery of the end of the small diameter step 1b. The retaining ring groove 15 has a rectangular cross section, and has an outer corner formed on an arc surface. The radius of curvature R1 of the circular arc surface is normally regulated to 0.6 mm or less, but here, the depth t (2.0 to 3.0 mm) of the retaining ring groove 15 is 0.5 to 1.5 ( 1.0 to 4.5 mm). As a result, the end portion of the small-diameter stepped portion 1b is plastically deformed (indicated by a two-dot chain line in the figure) during the caulking process, and even if a tensile stress is generated at the corner portion of the retaining ring groove 15, cracks start from here. It is possible to provide a wheel bearing device that can prevent the occurrence and can secure the strength of the caulking portion 8.

図３は、図２の止め輪溝の変形例を示している。なお、前述した実施形態と同一部品、同一部位あるいは同一機能を有する部品や部位には同じ符号を付して詳細な説明を省略する。この止め輪溝１６は、断面が矩形状に形成されると共に、両隅部が円弧面に形成されている。この円弧面の曲率半径Ｒ２は、止め輪溝１６の深さｔと略同一に設定されている。これにより、加締加工時に小径段部１ｂの端部が塑性変形され（図中２点鎖線にて示す）、止め輪溝１６の隅部に引張応力が生じても、ここを起点にクラックが発生するのを一層防止することができる。   FIG. 3 shows a modification of the retaining ring groove of FIG. The same parts, the same parts, or parts or parts having the same function as those of the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The retaining ring groove 16 is formed in a rectangular cross section, and both corners are formed in arcuate surfaces. The radius of curvature R2 of the arc surface is set to be substantially the same as the depth t of the retaining ring groove 16. As a result, the end portion of the small-diameter step portion 1b is plastically deformed (indicated by a two-dot chain line in the figure) during the caulking process, and even if a tensile stress is generated in the corner portion of the retaining ring groove 16, cracks start from here. Generation | occurrence | production can be prevented further.

図４は、図２の止め輪溝の他の変形例を示している。なお、前述した実施形態と同一部品、同一部位あるいは同一機能を有する部品や部位には同じ符号を付して詳細な説明を省略する。この止め輪溝１７は、断面が矩形状に形成されると共に、アウター側の隅部が円弧面に形成されると共に、インナー側の隅部に丸ヌスミ１７ａが形成されている。これにより、止め輪溝１７の隅部の切欠き感度（亀裂敏感性）を抑えることができ、加締加工時に小径段部１ｂの端部が塑性変形された時（図中２点鎖線にて示す）、止め輪溝１７の隅部の応力集中を緩和し、ここを起点にクラックが発生するのを一層防止することができる。   FIG. 4 shows another modification of the retaining ring groove of FIG. The same parts, the same parts, or parts or parts having the same function as those of the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The retaining ring groove 17 has a rectangular cross section, an outer side corner portion formed in an arcuate surface, and a round nudity 17a formed in an inner side corner portion. As a result, notch sensitivity (crack sensitivity) at the corners of the retaining ring groove 17 can be suppressed, and when the end of the small-diameter stepped portion 1b is plastically deformed during caulking (indicated by a two-dot chain line in the figure). It is possible to alleviate the stress concentration at the corner of the retaining ring groove 17 and further prevent cracks from occurring.

図５は、図２の止め輪溝のさらに他の変形例を示している。なお、前述した実施形態と同一部品、同一部位あるいは同一機能を有する部品や部位には同じ符号を付して詳細な説明を省略する。この止め輪溝１８は、断面が矩形状に形成されると共に、両隅部が円弧面に形成され、その曲率半径Ｒ３が通常の０．６ｍｍ以下に規制されている。ここでは、止め輪溝１８が加締加工後に形成されている。これにより、加締加工時、止め輪溝１８の隅部に引張応力が生じるのを防止し、ここを起点にクラックが発生するのを確実に防止することができる。   FIG. 5 shows still another modification of the retaining ring groove of FIG. The same parts, the same parts, or parts or parts having the same function as those of the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The retaining ring groove 18 is formed to have a rectangular cross section, and both corners are formed into arcuate surfaces, and the radius of curvature R3 is restricted to a normal value of 0.6 mm or less. Here, the retaining ring groove 18 is formed after caulking. Thereby, at the time of caulking, it can prevent that a tensile stress arises in the corner part of the retaining ring groove 18, and can prevent reliably that a crack generate | occur | produces here.

図６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、前述した実施形態と同一部品、同一部位あるいは同一機能を有する部品や部位には同じ符号を付して詳細な説明を省略する。   FIG. 6 is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention. The same parts, the same parts, or parts or parts having the same function as those of the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

この車輪用軸受装置は駆動輪側の第３世代構造をなし、ハブ輪１９と、このハブ輪１に圧入された内輪５とからなる内方部材２０と、外周に車体取付フランジ４ｂを一体に有し、内周に複列のテーパ状の外側転走面４ａ、４ａが一体に形成された外方部材４と、両転走面間に保持器６を介して転動自在に収容された複列の円錐ころ７、７とを備えている。   This wheel bearing device has a third generation structure on the drive wheel side, and an inner member 20 comprising a hub wheel 19 and an inner ring 5 press-fitted into the hub wheel 1, and a vehicle body mounting flange 4b on the outer periphery. And the outer member 4 in which double-row tapered outer rolling surfaces 4a and 4a are integrally formed on the inner periphery, and the rolling member is accommodated between the rolling surfaces via a cage 6. Double-row tapered rollers 7 and 7 are provided.

ハブ輪１９は、アウター側の端部に車輪取付フランジ３を一体に有し、外周に複列の外側転走面４ａ、４ａの一方（アウター側）に対向する内側転走面１９ａと、この内側転走面１９ａから軸方向に延びる円筒状の小径段部１ｂが形成され、内周にはトルク伝達用のセレーション（またはスプライン）１ｃが形成されている。そして、小径段部１ｂの端部を径方向外方に塑性変形させて形成した加締部８によって所定の軸受予圧が付与された状態で固定されている。   The hub wheel 19 integrally has a wheel mounting flange 3 at an end portion on the outer side, and an inner rolling surface 19a facing one side (outer side) of the outer row rolling surfaces 4a and 4a in a double row on the outer periphery. A cylindrical small diameter step portion 1b extending in the axial direction from the inner rolling surface 19a is formed, and a serration (or spline) 1c for torque transmission is formed on the inner periphery. And it fixes in the state to which the predetermined bearing preload was given by the crimping part 8 formed by carrying out the plastic deformation of the edge part of the small diameter step part 1b to radial direction outward.

ハブ輪１９はＳ５３Ｃ等の炭素０．４０〜０．８０ｗｔ％を含む中高炭素鋼で形成され、内側転走面１９ａをはじめ、車輪取付フランジ３の基部から小径段部１ｂに亙って高周波焼入れによって表面硬さが５８〜６４ＨＲＣの範囲に硬化処理が施されている。   The hub wheel 19 is made of medium and high carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, and induction hardening is performed from the base part of the wheel mounting flange 3 to the small diameter step part 1b including the inner rolling surface 19a. The surface hardness is 58 to 64 HRC.

外方部材４と内方部材２０との間に形成される環状空間の開口部にはシール９、９が装着され、軸受内部に封入された潤滑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。   Seals 9 and 9 are attached to the opening of the annular space formed between the outer member 4 and the inner member 20, and leakage of the lubricating grease enclosed inside the bearing to the outside, rainwater and Dust and the like are prevented from entering the bearing.

ここで、前述した実施形態と同様、加締加工前の小径段部１ｂの端部内周に止め輪溝１５が形成されている。この止め輪溝１５は、断面が矩形状に形成されると共に、両隅部が円弧面に形成され、少なくともアウター側の隅部の円弧面の曲率半径Ｒ１が、止め輪溝１５の深さｔの０．５〜１．５の範囲に設定されている。これにより、加締加工時に小径段部１ｂの端部が塑性変形され、止め輪溝１５の隅部に引張応力が生じ、ここを起点にクラックが発生するのを防止することができ、加締部８の強度を確保した車輪用軸受装置を提供することができる。   Here, as in the embodiment described above, a retaining ring groove 15 is formed on the inner periphery of the end of the small-diameter step portion 1b before caulking. The retaining ring groove 15 has a rectangular cross section, and both corners are formed into arcuate surfaces. At least the radius of curvature R1 of the arcuate surface of the outer corner is the depth t of the retaining ring groove 15. Of 0.5 to 1.5. As a result, the end portion of the small-diameter stepped portion 1b is plastically deformed during the caulking process, and tensile stress is generated in the corner portion of the retaining ring groove 15, and cracks can be prevented from occurring from this point. A wheel bearing device in which the strength of the portion 8 is ensured can be provided.

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、ハブ輪とこのハブ輪に嵌合された内輪を備え、この内輪が揺動加締により固定された第１乃至第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 is applied to a wheel bearing device having first to third generation structures, which includes a hub wheel and an inner ring fitted to the hub wheel, and the inner ring is fixed by swinging caulking. can do.

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. 図１の加締部を示す要部拡大図である。It is a principal part enlarged view which shows the crimping part of FIG. 図２の止め輪溝の変形例を示す要部拡大図である。It is a principal part enlarged view which shows the modification of the retaining ring groove of FIG. 図２の止め輪溝の他の変形例を示す要部拡大図である。It is a principal part enlarged view which shows the other modification of the retaining ring groove of FIG. 図２のさらに他の変形例を示す要部拡大図である。It is a principal part enlarged view which shows the other modification of FIG. 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. 図７の加締部を示す要部拡大図である。It is a principal part enlarged view which shows the crimping part of FIG. 他の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 other conventional wheel bearing apparatus. 加締加工の工程を示す説明図である。It is explanatory drawing which shows the process of a crimping process. 加締加工による不具合状態を示す模式図である。It is a schematic diagram which shows the malfunction state by caulking.

符号の説明Explanation of symbols

１、１９・・・・・・・・・ハブ輪
１ａ・・・・・・・・・・・肩部
１ｂ・・・・・・・・・・・小径段部
１ｃ・・・・・・・・・・・セレーション
２・・・・・・・・・・・・車輪用軸受
３・・・・・・・・・・・・車輪取付フランジ
３ａ・・・・・・・・・・・ハブボルト
４・・・・・・・・・・・・外方部材
４ａ・・・・・・・・・・・外側転走面
４ｂ・・・・・・・・・・・車体取付フランジ
５・・・・・・・・・・・・内輪
５ａ、１９ａ・・・・・・・内側転走面
５ｂ・・・・・・・・・・・大鍔部
５ｃ・・・・・・・・・・・小鍔部
５ｄ・・・・・・・・・・・大端面
５ｅ・・・・・・・・・・・面取り部
６・・・・・・・・・・・・保持器
７・・・・・・・・・・・・円錐ころ
８・・・・・・・・・・・・加締部
９・・・・・・・・・・・・シール
１０・・・・・・・・・・・シール板
１１・・・・・・・・・・・スリンガ
１２・・・・・・・・・・・転がり軸受
１３・・・・・・・・・・・止め輪
１４・・・・・・・・・・・環状溝
１４ａ、１４ｂ・・・・・・円弧面
１５、１６、１７、１８・・止め輪溝
１７ａ・・・・・・・・・・丸ヌスミ
２０・・・・・・・・・・・内方部材
５１、６４・・・・・・・・ハブ輪
５１ａ・・・・・・・・・・肩部
５１ｂ、６４ａ・・・・・・小径段部
５１ｃ・・・・・・・・・・セレーション
５２・・・・・・・・・・・車輪用軸受
５３・・・・・・・・・・・車輪取付フランジ
５３ａ・・・・・・・・・・ハブボルト
５４・・・・・・・・・・・外方部材
５４ａ・・・・・・・・・・外側転走面
５４ｂ・・・・・・・・・・車体取付フランジ
５５・・・・・・・・・・・内輪
５５ａ・・・・・・・・・・内側転走面
５５ｂ・・・・・・・・・・大鍔部
５５ｃ・・・・・・・・・・小鍔部
５５ｄ・・・・・・・・・・大端面
５５ｅ・・・・・・・・・・面取り部
５６・・・・・・・・・・・保持器
５７・・・・・・・・・・・円錐ころ
５８・・・・・・・・・・・加締部
５９・・・・・・・・・・・シール
６０・・・・・・・・・・・硬化層
６１・・・・・・・・・・・凹所
６２・・・・・・・・・・・転がり軸受
６３・・・・・・・・・・・止め輪
６５・・・・・・・・・・・円筒部
６６・・・・・・・・・・・加締用治具
６７・・・・・・・・・・・止め輪溝
ａ・・・・・・・・・・・・大鍔部の高さ
ｂ・・・・・・・・・・・・小径段部の凹所の内輪大端面からの深さ
ｎ・・・・・・・・・・・・環状溝の深さ
Ｐ・・・・・・・・・・・・硬化層のインナー側の端部位置
Ｐ０・・・・・・・・・・・内輪における面取り部の縁部
Ｐ１・・・・・・・・・・・大鍔部の高さに対応する位置
ｒ、ｒ１・・・・・・・・・内輪の面取り部の曲率半径
Ｒ１、Ｒ２、Ｒ３・・・・・止め輪溝の隅部の曲率半径
Ｒｉ、Ｒｏ・・・・・・・・環状溝の端部の曲率半径
ｔ・・・・・・・・・・・・止め輪溝の深さ 1, 19 ... hub wheel 1a ... shoulder 1b ... small diameter step 1c ... ... Serration 2 ... Wheel Bearing 3 ... Wheel Mounting Flange 3a ... Hub bolt 4 ... Outer member 4a ... Outer rolling surface 4b ... Car body mounting flange 5・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 5a, 19a ・ ・ ・ ・ ・ ・ Inner rolling surface 5b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Large collar 5c ・ ・ ・ ・ ・ ・ ・ ・... Small part 5d ·········· Large end surface 5e ······ Chamfered portion 6 ························· 7 ································ 8・ ・ ・ ・ ・ ・ Seal 10 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal plate 11 ・ ・ ・ ・ ・ ・ Slinger 12 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling bearing 13 ・·································································· 14・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Circle 20 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner members 51, 64 ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 51a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ Shoulder portions 51b, 64a,... Small diameter step portion 51c, Serration 52, ... Wheel bearing 53, ... .... Wheel mounting flange 53a ... Hub bolt 54 ... Outer member 54a ... Outer rolling surface 54b ... Body mounting flange 55 ... Inner ring 55a ... Inner rolling surface 55b ... Large collar part 55c ... ······ 55 d small end portion ··· large end surface 55e ··· chamfered portion 56 · · · · · · · · cage 57 ··························· 58 ... Hardened layer 61 ... Recess 62 ... Rolling bearing 63 ... Retaining ring 65 ... ············································································································· ············································ From the inner ring large end surface of the recess in the small diameter step Depth n ············································································ ··· Edge P1 of chamfered portion in inner ring ········ Position r, r1 ········· Chamfered portion of inner ring Radii of curvature R1, R2, R3... Curvature radii Ri, Ro... .... depth of retaining ring groove

Claims (6)

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円筒状の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、
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開口部に装着されたシールとを備え、
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ハブ輪に対して前記内輪が固定されると共に、前記ハブ輪の内周に転がり軸受が嵌合され、この転がり軸受が止め輪によって位置決め固定された車輪用軸受装置において、
前記小径段部の加締加工前の端部外周に環状溝が形成され、この環状溝が前記内輪のインナー側の内径端部から大端面を越えて形成され、当該環状溝の両端部が円弧面で形成され、前記加締部の近傍に前記止め輪を装着するための止め輪溝が形成されると共に、この止め輪溝の隅部のうち少なくともアウター側の隅部が円弧面に形成され、この円弧面の曲率半径が、当該止め輪溝の深さの０．５〜１．５の範囲に設定され、かつ前記止め輪溝のインナー側の隅部が前記環状溝のアウター側の円弧面と軸方向位置で重なるように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 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 and having a cylindrical small-diameter stepped portion extending in the axial direction on the outer periphery, and a small diameter stepped portion of the hub wheel via a predetermined squeezing An inner member formed of at least one inner ring press-fitted and formed with a double-row inner rolling surface facing the double-row outer rolling surface on the outer periphery;
A double row rolling element housed between the rolling surfaces of the inner member and the outer member so as to be freely rollable via a cage;
A seal attached to an opening of an annular space formed between the outer member and the inner member;
The inner ring is fixed to the hub ring by a caulking portion formed by plastically deforming the end portion of the small diameter step portion radially outward, and a rolling bearing is fitted to the inner periphery of the hub ring. In the wheel bearing device in which the rolling bearing is positioned and fixed by the retaining ring,
The small-diameter annular groove in the outer circumference of the end portion of the front caulking the stepped portion is formed, the annular groove is formed beyond the large end face from the inner diameter end portion of the inner ring on the inner side, both ends of the annular groove is arcuate is formed by a surface, said with snap ring groove for mounting the retaining ring in the vicinity of the caulking portion is formed, the corners of at least the outer side of the corner portion of the retaining ring groove is formed in an arcuate surface The radius of curvature of the arc surface is set in the range of 0.5 to 1.5 of the depth of the retaining ring groove , and the inner corner of the retaining ring groove is the outer arc of the annular groove. A wheel bearing device, wherein the wheel bearing device is formed so as to overlap with a surface in an axial direction position . 前記止め輪溝の両隅部が円弧面に形成され、これらの円弧面の曲率半径が、当該止め輪溝の深さと略同一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 both corners of the retaining ring groove are formed in an arc surface, and a radius of curvature of the arc surface is set to be substantially the same as a depth of the retaining ring groove. 前記止め輪溝の隅部のうちインナー側の隅部に丸ヌスミが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 round paste is formed at a corner on the inner side of the corner of the retaining ring groove. 前記止め輪溝が加締加工後に形成されている請求項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 claim 1, wherein the retaining ring groove is formed after caulking. 前記小径段部の加締加工前の端部が先端に向って漸次薄肉となる円筒状に形成され、前記環状溝の深さが０．５〜１．０ｍｍの範囲に形成されている請求項１に記載の車輪用軸受装置。   The end of the small-diameter step portion before caulking is formed in a cylindrical shape that gradually becomes thinner toward the tip, and the depth of the annular groove is formed in a range of 0.5 to 1.0 mm. The wheel bearing device according to 1. 前記環状溝の両端部に所定の曲率半径Ｒｉ、Ｒｏからなる円弧面が形成され、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、アウター側の円弧面の曲率半径Ｒｏよりも小さく設定され（ｒ１≦Ｒｉ≦Ｒｏ）、ＲｉがＲ１〜１０の範囲に設定されている請求項１に記載の車輪用軸受装置。   Arc surfaces having predetermined curvature radii Ri and Ro are formed at both ends of the annular groove, and the curvature radius Ri of the inner-side arc surface is larger than the curvature radius r1 of the chamfered portion of the inner ring, and the outer-side arc The wheel bearing device according to claim 1, wherein the wheel bearing device is set to be smaller than a curvature radius Ro of the surface (r1 ≦ Ri ≦ Ro), and Ri is set in a range of R1 to R10.
JP2008262344A 2008-10-09 2008-10-09 Wheel bearing device Expired - Fee Related JP5501595B2 (en)

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