JP2007051665A - Bearing device for wheel - Google Patents

Bearing device for wheel Download PDF

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Publication number
JP2007051665A
JP2007051665A JP2005236691A JP2005236691A JP2007051665A JP 2007051665 A JP2007051665 A JP 2007051665A JP 2005236691 A JP2005236691 A JP 2005236691A JP 2005236691 A JP2005236691 A JP 2005236691A JP 2007051665 A JP2007051665 A JP 2007051665A
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Prior art keywords
seal
bearing device
wheel
outer member
grinding
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JP2005236691A
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JP4530943B2 (en
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Hisashi Otsuki
寿志 大槻
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/64—Special methods of manufacture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/783—Details of the sealing or parts thereof, e.g. geometry, material of the mounting region
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/186—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Sealing Of Bearings (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel capable of securing stable unsealing proof strength by improving fitting force of a seal, and improving air-tightness and reliability of the seal. <P>SOLUTION: In this bearing device which comprises the seal 9 disposed on a circular space between an outer member 10 and an inner ring 3, and in which the seal 9 has a core metal 17 formed into an annular shape by press-forming a steel plate, and a seal member 18 vulcanized and adhered integrally with the core metal 17, and the core metal 17 is fitted and fixed to an inner periphery of an end portion of the outer member 10, a counter bore 19 and a large-diameter step portion formed from the counter bore 19 through a circular arc-shaped corner portion 20 are formed on the inner periphery of the end portion of the outer member 10 in advance by lathe turning, and a cylindrical seal fitting face 12 is formed on a tangent line of the corner portion 20 of the large-diameter step portion by grinding. Thus a fitting width with the core metal 17 can be secured, and the unsealing proof strength can be increased. <P>COPYRIGHT: (C)2007,JPO&INPIT

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、シール嵌合部を改善し、シールの機密性の向上を図った車輪用軸受装置に関するものである。   The present invention relates to a wheel bearing device for rotatably supporting a wheel of an automobile or the like, and more particularly to a wheel bearing device in which a seal fitting portion is improved to improve seal confidentiality.

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。   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.

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（外輪）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、あるいは、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世代構造とに大別されている。   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. It can be broadly divided into the second generation structure in which the body mounting flange or wheel mounting flange is directly formed on the outer periphery of the (outer ring), or the third generation structure in which one inner rolling surface is directly formed on the outer periphery of the hub wheel. ing.

図７は、このような従来の車輪用軸受装置の代表的な一例を示している。この車輪用軸受装置は第３世代と称される駆動輪用であって、外方部材５１と、ハブ輪５２およびこのハブ輪５２に圧入された内輪５３とからなる内方部材５４と、両部材間に収容された複列の転動体５５、５５とを備えている。   FIG. 7 shows a typical example of such a conventional wheel bearing device. This wheel bearing device is for a drive wheel referred to as a third generation, and includes an outer member 51, an inner member 54 including a hub wheel 52 and an inner ring 53 press-fitted into the hub wheel 52, Double row rolling elements 55 and 55 accommodated between the members are provided.

ハブ輪５２は、その一端部に車輪（図示せず）を取り付けるための車輪取付フランジ５６を一体に有し、外周に内側転走面５２ａと、この内側転走面５２ａから軸方向に延びる小径段部５２ｂが形成されると共に、内周にはトルク伝達用のセレーション５２ｄが形成されている。また、車輪取付フランジ５６の円周等配位置には車輪を固定するためのハブボルト５７が植設されている。そして、ハブ輪５２の小径段部５２ｂには、外周に内側転走面５３ａが形成された内輪５３が圧入され、ハブ輪５２の小径段部５２ｂの端部を径方向外方に塑性変形させて形成した加締部５２ｃにより、ハブ輪５２に対して内輪５３が軸方向へ抜けるのを防止している。   The hub wheel 52 integrally has a wheel mounting flange 56 for mounting a wheel (not shown) at one end thereof, an inner rolling surface 52a on the outer periphery, and a small diameter extending in the axial direction from the inner rolling surface 52a. A step 52b is formed, and a serration 52d for torque transmission is formed on the inner periphery. Further, hub bolts 57 for fixing the wheels are implanted in the circumferentially equidistant positions of the wheel mounting flanges 56. An inner ring 53 having an inner rolling surface 53a formed on the outer periphery is press-fitted into the small-diameter step portion 52b of the hub wheel 52, and the end portion of the small-diameter step portion 52b of the hub wheel 52 is plastically deformed outward in the radial direction. The caulking portion 52c formed in this manner prevents the inner ring 53 from coming off in the axial direction with respect to the hub wheel 52.

外方部材５１は、外周に車体取付フランジ５１ｂを一体に有し、内周に複列の外側転走面５１ａ、５１ａが形成されている。この複列の外側転走面５１ａ、５１ａと対向する内側転走面５２ａ、５３ａとの間には複列の転動体５５、５５が保持器５８を介して転動自在に収容されている。また、外方部材５１と内方部材５４とで形成される環状空間の開口部にはシール５９、６０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、外部からの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 51 integrally has a vehicle body mounting flange 51b on the outer periphery, and double row outer rolling surfaces 51a and 51a are formed on the inner periphery. Double row rolling elements 55, 55 are accommodated in a freely rollable manner via a cage 58 between the double row outer rolling surfaces 51 a, 51 a and the inner rolling surfaces 52 a, 53 a facing each other. Seals 59 and 60 are attached to the opening of the annular space formed by the outer member 51 and the inner member 54, leakage of lubricating grease sealed inside the bearing, rainwater and dust from the outside, etc. Is prevented from entering the inside of the bearing.

シール５９、６０のうち、例えばインボード側のシール６０は、図８に拡大して示すように、外方部材５１と内輪５３にそれぞれ装着された第１および第２のシール板６１、６２を有し、互いに対向して配置されている。第１のシール板６１は、耐食性の鋼鈑からなり、プレス加工によって断面略Ｌ字状に、全体として円環状に形成された芯金６３と、この芯金６３の外表面に沿って一体に加硫接着されたシール部材６４とからなる。一方、第２のシール板６２は、耐食性の鋼鈑からなり、プレス加工によって断面略Ｌ字状に、全体として円環状に形成され、スリンガを構成している。   Of the seals 59 and 60, for example, the inboard-side seal 60 includes first and second seal plates 61 and 62 mounted on the outer member 51 and the inner ring 53, respectively, as shown in an enlarged view in FIG. And are arranged opposite to each other. The first seal plate 61 is made of a corrosion-resistant steel plate and is integrally formed along the outer surface of the core metal 63 with a core metal 63 formed into a generally annular shape in a substantially L-shaped cross section by pressing. And a vulcanized and bonded seal member 64. On the other hand, the second seal plate 62 is made of a corrosion-resistant steel plate, and is formed into an annular shape as a whole in a substantially L-shaped cross section by press working to constitute a slinger.

ここで、外方部材５１の両端部には、カウンタボア５１ｃよりも大径で、シール６０（５９）を嵌合固定する円筒状のシール嵌合面６５が形成されている。このシール嵌合面６５は、嵌合部の気密性を確保するため厳しい寸法管理および仕上げ面粗さが必要とされるため、シール嵌合面６５の内端部に予め旋削加工にて軸方向に所定の幅をなす円弧状の研削逃げ溝６６が形成されると共に、シール嵌合面６５は、リード目のない研削加工（プランジカット）によって形成されている。これにより、研削砥石（図示せず）の角部に脱落（欠損）が生じることなく、研削加工により所望のシール嵌合面６５を形成することができる。なお、係る先行技術は文献公知発明に係るものでないため、記載すべき先行技術文献情報はない。   Here, cylindrical seal fitting surfaces 65 having a diameter larger than that of the counter bore 51c and fitting and fixing the seal 60 (59) are formed at both ends of the outer member 51. Since this seal fitting surface 65 requires strict dimensional control and finished surface roughness in order to secure the airtightness of the fitting portion, the inner end portion of the seal fitting surface 65 is axially processed by turning in advance. In addition, an arc-shaped grinding relief groove 66 having a predetermined width is formed, and the seal fitting surface 65 is formed by grinding (plunge cutting) without lead. Thereby, the desired seal fitting surface 65 can be formed by grinding without causing dropout (deletion) at the corners of the grinding wheel (not shown). Note that there is no prior art document information to be described because the prior art is not related to a known literature invention.

然しながら、こうした従来の車輪用軸受装置では、シール６０（５９）が装着される外方部材５１のシール嵌合面６５において、旋削により加工誤差および熱処理変形等によって研削逃げ溝６６の幅寸法がバラツク恐れがある。この研削逃げ溝６６の幅寸法が大きくなった場合、シール嵌合面６５とシール６０（５９）との嵌合幅が減少し、シール抜け耐力が低下してしまう。さらに、このシール抜け耐力の低下に伴い、運転中に軸受内部の昇温により内部圧力が増大したり、外部荷重により外方部材５１が弾性変形することにより、シール６０（５９）が移動してシール性が損なわれる恐れがあった。   However, in such a conventional wheel bearing device, the width dimension of the grinding relief groove 66 varies due to machining errors and heat treatment deformation due to turning on the seal fitting surface 65 of the outer member 51 to which the seal 60 (59) is mounted. There is a fear. When the width dimension of the grinding relief groove 66 is increased, the fitting width between the seal fitting surface 65 and the seal 60 (59) is reduced, and the seal drop resistance is reduced. Further, along with the decrease in the seal proof strength, the internal pressure increases due to the temperature rise in the bearing during operation, or the outer member 51 is elastically deformed by an external load, so that the seal 60 (59) moves. There was a risk of the sealing performance being impaired.

本発明は、このような事情に鑑みてなされたもので、シールの嵌合力を高めて安定したシール抜け耐力を確保すると共に、シールの機密性と信頼性を向上させ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 the above circumstances, and provides a wheel bearing device that enhances the fitting force of the seal to ensure a stable resistance to removing the seal and improves the confidentiality and reliability of the seal. The purpose is to do.

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形成された外方部材と、前記複列の外側転走面に対向する内側転走面が形成された内方部材と、前記両転走面間に転動自在に収容された複列の転動体と、前記両部材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、このシールが、鋼板からプレス加工によって円環状に形成された芯金と、この芯金に一体に加硫接着されたシール部材を有し、前記芯金が前記外方部材の端部内周に嵌合固定された車輪用軸受装置において、前記外方部材の端部内周に予め旋削加工によりカウンタボアが形成され、このカウンタボアに円筒状のシール嵌合面が研削加工によって形成されている。   In order to achieve such an object, the invention according to claim 1 of the present invention includes an outer member having a double row outer rolling surface formed on the inner periphery, and an inner side facing the double row outer rolling surface. Mounted on an inner member formed with a rolling surface, a double row rolling element accommodated between the both rolling surfaces, and an opening of an annular space formed between the two members. And a seal having a metal core formed in an annular shape by pressing from a steel plate, and a seal member integrally vulcanized and bonded to the metal core, wherein the metal core is formed of the outer member. In the wheel bearing device fitted and fixed to the inner periphery of the end, a counter bore is formed in advance on the inner periphery of the end of the outer member by turning, and a cylindrical seal fitting surface is formed on the counter bore by grinding. Has been.

このように、内周に複列の外側転走面が形成された外方部材と、複列の外側転走面に対向する内側転走面が形成された内方部材と、両転走面間に転動自在に収容された複列の転動体と、両部材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、このシールが、鋼板からプレス加工によって円環状に形成された芯金と、この芯金に一体に加硫接着されたシール部材を有し、芯金が外方部材の端部内周に嵌合固定された車輪用軸受装置において、外方部材の端部内周に予め旋削加工によりカウンタボアが形成され、このカウンタボアに円筒状のシール嵌合面が研削加工によって形成されているので、寸法バラツキの要因となる研削逃げ溝を廃止することができ、シール嵌合面と芯金との間の嵌合幅を確保して安定したシール抜け耐力を得ることができる。   Thus, the outer member in which the outer rolling surface of the double row is formed on the inner periphery, the inner member in which the inner rolling surface facing the outer rolling surface of the double row is formed, and both rolling surfaces It is provided with a double row rolling element accommodated so as to be freely rollable between, and a seal attached to an opening of an annular space formed between both members, and this seal is formed into an annular shape from a steel plate by pressing. In a wheel bearing device having a cored bar and a seal member integrally vulcanized and bonded to the cored bar, and the cored bar is fitted and fixed to the inner periphery of the end of the outer member, the end of the outer member A counterbore is formed in advance on the inner periphery of the part by a turning process, and a cylindrical seal fitting surface is formed on the counterbore by grinding, so the grinding clearance groove that causes the dimensional variation can be eliminated, Stable seal pull-out resistance by securing the fitting width between the seal fitting surface and the cored bar It is possible to obtain.

好ましくは、請求項２に記載の発明のように、前記外方部材の端部内周に前記カウンタボアから、予め旋削加工により円弧状の隅部と、この隅部の接線上に大径段部が形成されると共に、この大径段部に前記シール嵌合面が形成されていれば、シールの断面高さを大きくでき、シールの設計自由度を高めてシール性を向上させることができる。   Preferably, as in the second aspect of the present invention, an arc-shaped corner portion is formed in advance by turning from the counter bore on the inner periphery of the end portion of the outer member, and a large-diameter step portion is tangent to the corner portion. If the seal fitting surface is formed on the large-diameter step portion, the cross-sectional height of the seal can be increased, the degree of freedom in designing the seal can be increased, and the sealing performance can be improved.

また、請求項３に記載の発明のように、前記カウンタボアが所定の研削取代を残して旋削加工され、当該カウンタボアが研削加工により形成されて前記シール嵌合面とすれば、旋削加工のサイクルアップによる低コスト化を図ることができる。   Further, as in the invention described in claim 3, if the counter bore is turned while leaving a predetermined grinding allowance, and the counter bore is formed by grinding to serve as the seal fitting surface, the turning work is performed. Cost reduction can be achieved by cycle up.

また、請求項４に記載の発明のように、前記シール嵌合面が前記外側転走面と一体に総型の研削砥石によって同時に研削加工されていれば、滑らかな繋ぎ部が形成でき、繋ぎ部にバリ等が発生するのを防止してシール嵌合面の同軸度や真円度が精度良く形成できる。したがって、シールの嵌合力を一層高め、安定したシール抜け耐力を確保することができる。   Further, as in the invention described in claim 4, if the seal fitting surface is ground together with the outer rolling surface at the same time by a total grinding wheel, a smooth joint portion can be formed, and the joint is formed. It is possible to prevent the occurrence of burrs or the like in the portion, and to form the seal fitting surface with a coaxiality and roundness with high accuracy. Therefore, the fitting force of the seal can be further increased, and a stable seal proof strength can be ensured.

好ましくは、請求項５に記載の発明のように、前記シール嵌合面の開口部に予め旋削加工により面取り部が形成され、この面取り部が総型の研削砥石によって同時に研削加工されていれば、面取り部の同軸度や真円度が精度良く形成できると共に、シール圧入時におけるシールのかじり損傷等の圧入不良を防止することができる。   Preferably, as in the invention described in claim 5, a chamfered portion is formed in advance in the opening portion of the seal fitting surface by turning, and the chamfered portion is simultaneously ground by a general grinding wheel. The coaxiality and roundness of the chamfered portion can be formed with high accuracy, and press-fitting failure such as galling damage of the seal during press-fitting of the seal can be prevented.

本発明に係る車輪用軸受装置は、内周に複列の外側転走面が形成された外方部材と、前記複列の外側転走面に対向する内側転走面が形成された内方部材と、前記両転走面間に転動自在に収容された複列の転動体と、前記両部材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、このシールが、鋼板からプレス加工によって円環状に形成された芯金と、この芯金に一体に加硫接着されたシール部材を有し、前記芯金が前記外方部材の端部内周に嵌合固定された車輪用軸受装置において、前記外方部材の端部内周に予め旋削加工によりカウンタボアが形成され、このカウンタボアに円筒状のシール嵌合面が研削加工によって形成されているので、寸法バラツキの要因となる研削逃げ溝を廃止することができ、シール嵌合面とシールとの間の嵌合幅を確保して安定したシール抜け耐力を得ることができる。   The wheel bearing device according to the present invention includes an outer member in which a double row outer rolling surface is formed on an inner periphery, and an inner side in which an inner rolling surface facing the double row outer rolling surface is formed. A member, a double row rolling element accommodated between the rolling surfaces, and a seal attached to an opening of an annular space formed between the two members. It has a metal core formed in an annular shape by pressing from a steel plate, and a seal member integrally vulcanized and bonded to the metal core, and the metal core is fitted and fixed to the inner periphery of the end of the outer member. In the wheel bearing device, a counter bore is formed in advance on the inner periphery of the end portion of the outer member by turning, and a cylindrical seal fitting surface is formed on the counter bore by grinding. The grinding clearance groove that becomes To ensure the fitting width between it is possible to obtain stable sealing release resistance.

内周に複列の外側転走面が形成された外方部材と、前記複列の外側転走面に対向する内側転走面が形成された内方部材と、前記両転走面間に転動自在に収容された複列の転動体と、前記両部材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、このシールが、鋼板からプレス加工によって円環状に形成された芯金と、この芯金に一体に加硫接着されたシール部材を有し、前記芯金が前記外方部材の端部内周に嵌合固定された車輪用軸受装置において、前記外方部材の端部内周に予め旋削加工により、カウンタボアと、このカウンタボアから円弧状の隅部を介して大径段部が形成されると共に、この大径段部の前記隅部の接線上に円筒状のシール嵌合面が研削加工によって形成されている。   An outer member having a double row outer rolling surface formed on the inner periphery, an inner member having an inner rolling surface opposed to the double row outer rolling surface, and the both rolling surfaces A double row rolling element accommodated in a freely rollable manner and a seal attached to an opening of an annular space formed between the two members, and the seal is formed in an annular shape by pressing from a steel plate. In the wheel bearing device in which the metal core is fitted and fixed to the inner circumference of the end of the outer member, the outer member A counter bore and a large-diameter step portion are formed from the counter bore through an arc-shaped corner portion by turning in advance on the inner periphery of the end portion, and a cylinder is formed on the tangent line of the corner portion of the large-diameter step portion. A shaped seal fitting surface is formed by grinding.

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の要部拡大図、図３（ａ）は、本発明に係る外方部材の旋削加工方法を示す説明図、（ｂ）は、研削加工方法を示す説明図である。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トボード側（図面左側）、中央寄り側をインボード側（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 is an enlarged view of a main part of FIG. 1, and FIG. 3 (a) is an outer member according to the present invention. Explanatory drawing which shows this turning method, (b) is explanatory drawing which shows the grinding method. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outboard side (left side in the drawing), and the side closer to the center is referred to as the inboard side (right side in the drawing).

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

ハブ輪２は、アウトボード側の端部に車輪（図示せず）を取り付けるための車輪取付フランジ４を一体に有し、この車輪取付フランジ４の円周等配位置に車輪を固定するためのハブボルト５が植設されている。また、ハブ輪２の外周には内側転走面２ａと、この内側転走面２ａから軸方向に延びる円筒状の小径段部２ｂが形成され、内周にトルク伝達用のセレーション（またはスプライン）２ｄが形成されている。そして、外周に内側転走面３ａが形成された内輪３が小径段部２ｂに圧入され、さらに、小径段部２ｂの端部を径方向外方に塑性変形させて形成した加締部２ｃにより、ハブ輪２に対して内輪３が軸方向へ抜けるのを防止している。   The hub wheel 2 integrally has a wheel mounting flange 4 for mounting a wheel (not shown) at an end portion on the outboard side, and is used for fixing the wheel at a circumferentially equidistant position of the wheel mounting flange 4. Hub bolts 5 are planted. Further, an inner rolling surface 2a and a cylindrical small diameter step portion 2b extending in the axial direction from the inner rolling surface 2a are formed on the outer periphery of the hub wheel 2, and a serration (or spline) for torque transmission is formed on the inner periphery. 2d is formed. Then, the inner ring 3 having the inner raceway surface 3a formed on the outer periphery is press-fitted into the small diameter step portion 2b, and the end portion of the small diameter step portion 2b is plastically deformed radially outward by a caulking portion 2c. The inner ring 3 is prevented from coming off in the axial direction with respect to the hub ring 2.

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

ハブ輪２は、Ｓ５３Ｃ等の炭素０．４０〜０．８０重量％を含む中炭素鋼（ＪＩＳ規格のＳＣ系機械構造用炭素鋼）で形成され、アウトボード側の内側転走面２ａをはじめ、シール８が摺接するシールランド部１１、および小径段部２ｂに亙り高周波焼入れによって表面硬さを５８〜６４ＨＲＣの範囲に硬化処理が施されている。なお、加締部２ｃは、鍛造後の素材表面硬さ２５ＨＲＣ以下の未焼入れ部としている。こうした高周波焼入れパターンによりハブ輪２の強度が向上すると共に、内輪３の嵌合面におけるフレッティング摩耗が抑制されて耐久性が向上する。また、加締部２ｃの加工性を向上させ、塑性変形によるクラック等の発生を防止することができる。   The hub wheel 2 is made of medium carbon steel (JIS standard SC structural carbon steel) containing 0.40 to 0.80% by weight of carbon such as S53C, and includes an inner rolling surface 2a on the outboard side. The surface hardness of the seal land portion 11 and the small diameter step portion 2b with which the seal 8 is slidably contacted is induction-hardened to a surface hardness of 58 to 64 HRC. The caulking portion 2c is an unquenched portion having a material surface hardness of 25 HRC or less after forging. Such an induction hardening pattern improves the strength of the hub wheel 2 and suppresses fretting wear on the fitting surface of the inner ring 3 to improve durability. Moreover, the workability of the caulking portion 2c can be improved, and the occurrence of cracks and the like due to plastic deformation can be prevented.

一方、外方部材１０は、ハブ輪２と同様、Ｓ５３Ｃ等の炭素０．４０〜０．８０重量％を含む中炭素鋼で形成され、複列の外側転走面１０ａ、１０ａのみ、または、これからシール嵌合面１２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、ここでは、転動体６、６をボールとした複列アンギュラ玉軸受を例示したが、これに限らず転動体６に円すいころを使用した複列円すいころ軸受であっても良い。   On the other hand, the outer member 10 is formed of medium carbon steel containing 0.40 to 0.80% by weight of carbon such as S53C, just like the hub wheel 2, and only the double row outer raceway surfaces 10a and 10a, or From now on, the surface hardness is hardened in the range of 58 to 64 HRC by induction hardening over the seal fitting surface 12. In addition, although the double row angular contact ball bearing which used the rolling elements 6 and 6 as a ball | bowl was illustrated here, the double row tapered roller bearing which uses a tapered roller for the rolling element 6 may be sufficient not only in this.

シール８、９のうちアウトボード側のシール８は、外方部材１０のシール嵌合面１２に嵌合された芯金１３と、この芯金１３の内端縁に一体に加硫接着されたシール部材１４とからなる。芯金１３は、オーステナイト系ステンレス鋼鈑（ＪＩＳ規格のＳＵＳ３０４系等）あるいは防錆処理された冷間圧延鋼鈑（ＪＩＳ規格のＳＰＣＣ系等）からなり、プレス加工によって断面略コの字状に、全体として円環状に形成されている。また、シール部材１４は、シールランド部１１に摺接する一対のサイドリップ１４ａ、１４ｂおよびラジアルリップ１４ｃを備えている。   The seal 8 on the outboard side of the seals 8 and 9 is integrally vulcanized and bonded to the core metal 13 fitted to the seal fitting surface 12 of the outer member 10 and the inner end edge of the core metal 13. And a seal member 14. The core bar 13 is made of an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like), and has a substantially U-shaped cross section by pressing. The whole is formed in an annular shape. The seal member 14 includes a pair of side lips 14 a and 14 b and a radial lip 14 c that are in sliding contact with the seal land portion 11.

一方、インボード側のシール９は、図２に拡大して示すように、外方部材１０と内輪３にそれぞれ装着された第１および第２のシール板１５、１６を有し、互いに対向して配置されている。第１のシール板１５は、外方部材１０のシール嵌合面１２に嵌合された芯金１７と、この芯金１７の内端縁に一体に加硫接着されたシール部材１８とからなる。芯金１７は、オーステナイト系ステンレス鋼鈑（ＪＩＳ規格のＳＵＳ３０４系等）あるいは防錆処理された冷間圧延鋼鈑（ＪＩＳ規格のＳＰＣＣ系等）からなり、プレス加工によって断面略Ｌ字状に、全体として円環状に形成されている。また、シール部材１８は、サイドリップ１８ａおよび一対のラジアルリップ１８ｂ、１８ｃを備えている。   On the other hand, the seal 9 on the inboard side has first and second seal plates 15 and 16 respectively attached to the outer member 10 and the inner ring 3, as shown in an enlarged view in FIG. Are arranged. The first seal plate 15 includes a metal core 17 fitted to the seal fitting surface 12 of the outer member 10 and a seal member 18 integrally vulcanized and bonded to the inner end edge of the metal core 17. . The metal core 17 is made of an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like). It is formed in an annular shape as a whole. The seal member 18 includes a side lip 18a and a pair of radial lips 18b and 18c.

第２のシール板１６は、オーステナイト系ステンレス鋼鈑（ＪＩＳ規格のＳＵＳ３０４系等）あるいは防錆処理された冷間圧延鋼鈑（ＪＩＳ規格のＳＰＣＣ系等）からなり、プレス加工によって断面略Ｌ字状に、全体として円環状に形成され、スリンガを構成している。なお、第２のシール板１６は、内輪３に圧入され、第１のシール板１５のラジアルリップ１８ｂ、１８ｃが摺接する円筒部１６ａと、この円筒部１６ａから径方向外方に延び、第１のシール板１５のサイドリップ１８ａが摺接する立板部１６ｂとからなる。   The second seal plate 16 is made of an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like), and has a substantially L-shaped cross section by press working. Are formed in an annular shape as a whole and constitute a slinger. The second seal plate 16 is press-fitted into the inner ring 3 and extends radially outward from the cylindrical portion 16a in which the radial lips 18b and 18c of the first seal plate 15 are in sliding contact. The side lip 18a of the sealing plate 15 comprises a standing plate portion 16b in sliding contact.

ここで、外方部材１０には予め旋削加工により外側転走面１０ａの溝底から所定の深さを有するカウンタボア１９が形成されている。このカウンタボア１９は、通常、組み立てられた転動体６が脱落しないように設けられるが、この種の第３世代構造の車輪用軸受装置においては、転動体６および内輪３を組み立てた後、内輪３が加締部２ｃによって軸方向に固定されるため、組立後の転動体６の脱落を考慮する必要はなく、外側転走面１０ａの溝底径が測定できる程度に溝底を残して溝底径より僅かに小径に形成されている。   Here, a counter bore 19 having a predetermined depth from the groove bottom of the outer rolling surface 10a is formed in the outer member 10 in advance by turning. The counterbore 19 is usually provided so that the assembled rolling element 6 does not fall off. In this type of third-generation wheel bearing device, after the rolling element 6 and the inner ring 3 are assembled, the inner ring 3 is fixed in the axial direction by the caulking portion 2c, so there is no need to consider dropping of the rolling elements 6 after assembly, leaving the groove bottom to the extent that the groove bottom diameter of the outer rolling surface 10a can be measured. The diameter is slightly smaller than the bottom diameter.

また、第１のシール板１５が装着されるシール嵌合面１２がカウンタボア１９よりも大径に形成され、その内端部には円弧状の隅部２０が設けられている。シール嵌合面１２は、研削加工によって隅部２０の接線から軸方向に延びる円筒面に形成されている。これにより、シールの設計自由度を高めてインボード側のシール９の断面高さを大きくできるので、シール９の設計自由度を高めてシール性を向上させることができる。また、バラツキの要因となる研削逃げ溝を廃止することができ、シール嵌合面１２と第１のシール板１５との間の嵌合幅を確保して安定したシール抜け耐力を得ることができる。   Further, the seal fitting surface 12 on which the first seal plate 15 is mounted is formed to have a larger diameter than the counter bore 19, and an arcuate corner 20 is provided at the inner end thereof. The seal fitting surface 12 is formed into a cylindrical surface extending in the axial direction from the tangent to the corner 20 by grinding. Thereby, since the design freedom degree of a seal | sticker can be raised and the cross-sectional height of the seal 9 on the inboard side can be enlarged, the design freedom degree of the seal | sticker 9 can be raised and a sealing performance can be improved. Further, the grinding clearance groove that causes the variation can be eliminated, and the fitting width between the seal fitting surface 12 and the first seal plate 15 can be ensured to obtain a stable seal proof strength. .

図３は、シール嵌合面１２の加工方法を示す説明図である。まず、図３（ａ）に示すように、超硬チップからなるバイト２１によって鍛造素材（図中二点鎖線にて示す）から外側転走面１０ａ’をはじめ外方部材１０’の内周面が所定の研削取代を残して形成される。この時、バイト２１の先端ノーズＲで円弧状の隅部２０が形成され、この隅部２０の接線から軸方向に延びる大径段部１２’と面取り部２３が形成される。なお、この大径段部１２’は後述するシール嵌合面１２となる。   FIG. 3 is an explanatory view showing a method of processing the seal fitting surface 12. First, as shown in FIG. 3A, the outer peripheral surface 10a ′ and the inner peripheral surface of the outer member 10 ′ are formed from a forging material (shown by a two-dot chain line in the figure) by a cutting tool 21 made of a carbide chip. Is formed leaving a predetermined grinding allowance. At this time, an arcuate corner portion 20 is formed at the tip nose R of the cutting tool 21, and a large-diameter step portion 12 ′ and a chamfered portion 23 extending in the axial direction from the tangent line of the corner portion 20 are formed. The large diameter step portion 12 'serves as a seal fitting surface 12 described later.

旋削加工を終えた外方部材１０’は、複列の外側転走面１０ａ’、１０ａ’のみ、または、これから大径段部１２’および面取り部２３に亙って高周波焼入れによって所定の表面硬さに硬化処理された後、図３（ｂ）に示すように、外側転走面１０ａとシール嵌合面１２が総型の研削砥石２２によって一体に同時研削されている。これにより、滑らかな繋ぎ部が形成でき、繋ぎ部にバリ等が発生するのを防止してシール嵌合面１２が所望の形状・寸法に形成できると共に、同軸度や真円度が精度良く形成できる。したがって、シールの嵌合力を高めて安定したシール抜け耐力を確保すると共に、シールの気密性と信頼性を向上させた車輪用軸受装置を提供することができる。なお、複列の外側転走面１０ａ’のみを硬化処理し、大径段部１２’を生研削してシール嵌合面１２を形成するようにしても良い。   After turning, the outer member 10 ′ has a predetermined surface hardness by induction hardening over only the double row outer rolling surfaces 10 a ′ and 10 a ′, or over the large diameter stepped portion 12 ′ and the chamfered portion 23. After the hardening process, as shown in FIG. 3 (b), the outer rolling surface 10a and the seal fitting surface 12 are integrally ground simultaneously by a general grinding wheel 22. As a result, a smooth joint portion can be formed, and burrs and the like can be prevented from occurring in the joint portion, and the seal fitting surface 12 can be formed in a desired shape and size, and the coaxiality and roundness can be accurately formed. it can. Therefore, it is possible to provide a wheel bearing device in which the fitting force of the seal is increased to ensure a stable seal proof strength and the airtightness and reliability of the seal are improved. Alternatively, only the double-row outer rolling surface 10a 'may be hardened, and the large-diameter step portion 12' may be raw ground to form the seal fitting surface 12.

さらに、図示はしないが、外側転走面１０ａとシール嵌合面１２だけでなく面取り部２３も総型の砥石によって一体に同時研削することにより、面取り部２３の同軸度や真円度が精度良く形成できると共に、シール圧入時における第１のシール板（図示せず）のかじり損傷等の圧入不良を防止することができる。   Further, although not shown, not only the outer rolling surface 10a and the seal fitting surface 12 but also the chamfered portion 23 are ground simultaneously and integrally with a grindstone so that the coaxiality and roundness of the chamfered portion 23 are accurate. In addition to being able to be formed well, it is possible to prevent press-fitting failure such as galling damage of the first seal plate (not shown) during press-fitting of the seal.

なお、ここでは、シール嵌合面１２と外側転走面１０ａとの同軸度を高めるために両者を同時研削する方法を例示したが、これに限らず、シール嵌合面１２を単独に研削加工しても良い。この場合、研削砥石の端面を略１５°傾斜させて角部を鈍角にするか、あるいは、角部を０．５Ｒ程度の円弧形状に成形するのが好ましい。これにより、研削砥石の角部の剛性を高めて加工時の脱落を防止し、研削逃げ溝を設けることなく研削加工することができる。   Here, in order to increase the coaxiality between the seal fitting surface 12 and the outer rolling surface 10a, a method of simultaneously grinding the both is illustrated, but not limited to this, the seal fitting surface 12 is ground independently. You may do it. In this case, it is preferable to incline the end face of the grinding wheel approximately 15 ° to make the corners obtuse, or to form the corners into an arc shape of about 0.5R. This increases the rigidity of the corners of the grinding wheel to prevent dropping during processing, and grinding can be performed without providing a grinding relief groove.

図４は、本発明に係る車輪用軸受装置の第２の実施形態を示す縦断面図である。なお、この実施形態は軸受部の構成が異なり、前述した第１の実施形態と同一部位同一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してその詳細な説明を省略する。   FIG. 4 is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention. In this embodiment, the configuration of the bearing portion is different, and the same parts as those in the first embodiment described above or parts having the same functions 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用の第１世代と称され、ハブ輪２４と、このハブ輪２４に圧入され、ナックル２５に対してハブ輪２４を回転自在に支承する車輪用軸受２６とを主たる構成としている。ハブ輪２４は、アウトボード側の端部に図示しない車輪およびブレーキロータを取り付けるための車輪取付フランジ４と、この車輪取付フランジ４から軸方向に延びる円筒状の小径段部２４ａが形成されている。この小径段部２４ａの外周面に車輪用軸受２６が圧入されている。また、車輪用軸受２６はナックル２５に所定のシメシロで圧入され、鍔部２５ａと止め輪２７によって軸方向に位置決めされている。   This wheel bearing device is called the first generation for driving wheels, and includes a hub wheel 24 and a wheel bearing 26 that is press-fitted into the hub wheel 24 and rotatably supports the hub wheel 24 with respect to the knuckle 25. Main structure. The hub wheel 24 is formed with a wheel mounting flange 4 for mounting a wheel and a brake rotor (not shown) at an end portion on the outboard side, and a cylindrical small-diameter step portion 24 a extending in the axial direction from the wheel mounting flange 4. . A wheel bearing 26 is press-fitted into the outer peripheral surface of the small diameter step portion 24a. Further, the wheel bearing 26 is press-fitted into the knuckle 25 with a predetermined scissors, and is positioned in the axial direction by the flange portion 25 a and the retaining ring 27.

車輪用軸受２６は複列のアンギュラ玉軸受からなり、外輪（外方部材）２８と一対の内輪（内方部材）３、３と複列の転動体６、６とを備えている。外輪２８はＳＵＪ２等の高炭素クロム軸受鋼からなり、内周には複列の外側転走面１０ａ、１０ａが一体に形成されている。一方、内輪３もＳＵＪ２等の高炭素クロム軸受鋼からなり、その外周には、前記複列の外側転走面１０ａ、１０ａに対向する内側転走面３ａがそれぞれ形成されている。そして、ＳＵＪ２等の高炭素クロム軸受鋼からなる複列の転動体６、６がこれら転走面１０ａ、３ａ間にそれぞれ収容され、保持器７、７によって転動自在に保持されている。また、車輪用軸受２６の端部にはシール２９、９が装着され、軸受内部に封入された潤滑グリースの漏洩と、外部からの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 26 includes a double-row angular ball bearing, and includes an outer ring (outer member) 28, a pair of inner rings (inner members) 3 and 3, and double-row rolling elements 6 and 6. The outer ring 28 is made of high carbon chrome bearing steel such as SUJ2, and double row outer rolling surfaces 10a and 10a are integrally formed on the inner periphery. On the other hand, the inner ring 3 is also made of high carbon chrome bearing steel such as SUJ2, and inner rolling surfaces 3a facing the double-row outer rolling surfaces 10a and 10a are formed on the outer periphery thereof. And the double row rolling elements 6 and 6 which consist of high carbon chromium bearing steels, such as SUJ2, are each accommodated between these rolling surfaces 10a and 3a, and are hold | maintained by the holder | retainers 7 and 7 so that rolling is possible. Further, seals 29 and 9 are attached to the end portion of the wheel bearing 26 to prevent leakage of lubricating grease sealed inside the bearing and intrusion of rainwater and dust from the outside into the bearing. .

ここで、第１のシール板１５が装着されるシール嵌合面３０はカウンタボアをなし、研削加工によって軸方向に延びる円筒面に形成されている。これにより、従来の研削逃げ溝あるいは前述した実施形態の隅部や段差を廃止することができ、旋削加工のサイクルアップによる低コスト化を図ることができると共に、シール嵌合面３０は、第１のシール板１５と所望の嵌合幅を確保して安定したシール抜け耐力を得ることができる。   Here, the seal fitting surface 30 to which the first seal plate 15 is attached forms a counter bore, and is formed in a cylindrical surface extending in the axial direction by grinding. As a result, the conventional grinding clearance groove or the corners and steps in the above-described embodiment can be eliminated, and the cost can be reduced by turning up the turning process. The seal plate 15 and a desired fitting width can be ensured to obtain a stable seal proof strength.

図６は、シール嵌合面３０の加工方法を示す説明図である。まず、図６（ａ）に示すように、超硬チップからなるバイト２１によって鍛造素材（図中二点鎖線にて示す）から外側転走面１０ａ’をはじめシール嵌合面３０となるカウンタボア３０’等、外輪２８’の内周面が所定の研削取代を残して形成される。   FIG. 6 is an explanatory diagram showing a method for processing the seal fitting surface 30. First, as shown in FIG. 6 (a), a counter bore which becomes a seal fitting surface 30 including the outer rolling surface 10a 'from a forging material (shown by a two-dot chain line in the figure) by a cutting tool 21 made of a carbide chip. The inner peripheral surface of the outer ring 28 ', such as 30', is formed leaving a predetermined grinding allowance.

旋削加工を終えた外輪２８’は、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た後、図３（ｂ）に示すように、外側転走面１０ａをはじめシール嵌合面３０が総型の研削砥石２２によって一体に同時研削されている。これにより、滑らかな繋ぎ部が形成でき、繋ぎ部にバリ等が発生するのを防止してシール嵌合面３０が所望の形状・寸法に形成できると共に、同軸度や真円度が精度良く形成できる。したがって、シールの嵌合力を高めて安定したシール抜け耐力を確保すると共に、シールの気密性と信頼性を向上させた車輪用軸受２６を提供することができる。   The outer ring 28 ′ after the turning process is hardened in the range of 58 to 64 HRC up to the core part by quenching, and then, as shown in FIG. 3 (b), the outer rolling surface 10 a and the seal fitting surface 30. Are simultaneously ground by a grinding wheel 22 of a total type. As a result, a smooth joint portion can be formed, and burrs and the like can be prevented from occurring in the joint portion, so that the seal fitting surface 30 can be formed in a desired shape and size, and the coaxiality and roundness can be accurately formed. it can. Therefore, it is possible to provide the wheel bearing 26 that enhances the fitting force of the seal to ensure a stable seal proof strength and improves the hermeticity and reliability of the seal.

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、駆動輪用、従動輪用に拘わらず、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 can be applied to a wheel bearing device having a first to third generation structure regardless of whether it is for driving wheels or driven wheels.

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の要部拡大図である。It is a principal part enlarged view of FIG. 図１に示す外方部材の加工方法を示し、（ａ）は旋削加工方法を示す説明図、（ｂ）は、研削加工方法を示す説明図である。FIGS. 1A and 1B show a method for processing the outer member shown in FIG. 1. FIG. 1A is an explanatory diagram showing a turning method, and 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. 図４の要部拡大図である。It is a principal part enlarged view of FIG. 図４に示す外輪の加工方法を示し、（ａ）は旋削加工方法を示す説明図、（ｂ）は、研削加工方法を示す説明図である。FIG. 4 shows an outer ring machining method shown in FIG. 4, (a) is an explanatory diagram showing a turning method, and (b) is an explanatory diagram showing a grinding method. 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の要部拡大図である。It is a principal part enlarged view of FIG.

符号の説明Explanation of symbols

１・・・・・・・・・・・・・・・内方部材
２、２４・・・・・・・・・・・・ハブ輪
２ａ、３ａ・・・・・・・・・・・内側転走面
２ｂ、２４ａ・・・・・・・・・・小径段部
２ｃ・・・・・・・・・・・・・・加締部
２ｄ・・・・・・・・・・・・・・セレーション
３・・・・・・・・・・・・・・・内輪
４・・・・・・・・・・・・・・・車輪取付フランジ
５・・・・・・・・・・・・・・・ハブボルト
６・・・・・・・・・・・・・・・転動体
７・・・・・・・・・・・・・・・保持器
８、９、２９・・・・・・・・・・シール
１０、１０’・・・・・・・・・・外方部材
１０ａ、１０ａ’・・・・・・・・外側転走面
１０ｂ・・・・・・・・・・・・・車体取付フランジ
１１・・・・・・・・・・・・・・シールランド
１２、３０・・・・・・・・・・・シール嵌合面
１２’・・・・・・・・・・・・・大径段部
１３、１７・・・・・・・・・・・芯金
１４、１８・・・・・・・・・・・シール部材
１４ａ、１４ｂ、１８ａ・・・・・サイドリップ
１４ｃ、１８ｂ、１８ｃ・・・・・ラジアルリップ
１５・・・・・・・・・・・・・・第１のシール板
１６・・・・・・・・・・・・・・第２のシール板
１６ａ・・・・・・・・・・・・・円筒部
１６ｂ・・・・・・・・・・・・・立板部
１９、３０’・・・・・・・・・・カウンタボア
２０・・・・・・・・・・・・・・隅部
２１・・・・・・・・・・・・・・バイト
２２・・・・・・・・・・・・・・研削砥石
２３・・・・・・・・・・・・・・面取り部
２５・・・・・・・・・・・・・・ナックル
２５ａ・・・・・・・・・・・・・鍔部
２６・・・・・・・・・・・・・・車輪用軸受
２７・・・・・・・・・・・・・・止め輪
２８、２８’・・・・・・・・・・外輪
５１・・・・・・・・・・・・・・外方部材
５１ａ・・・・・・・・・・・・・外側転走面
５１ｂ・・・・・・・・・・・・・車体取付フランジ
５１ｃ・・・・・・・・・・・・・カウンタボア
５２・・・・・・・・・・・・・・ハブ輪
５２ａ、５３ａ・・・・・・・・・内側転走面
５２ｂ・・・・・・・・・・・・・小径段部
５２ｃ・・・・・・・・・・・・・加締部
５２ｄ・・・・・・・・・・・・・セレーション
５３・・・・・・・・・・・・・・内輪
５４・・・・・・・・・・・・・・内方部材
５５・・・・・・・・・・・・・・転動体
５６・・・・・・・・・・・・・・車輪取付フランジ
５７・・・・・・・・・・・・・・ハブボルト
５８・・・・・・・・・・・・・・保持器
５９、６０・・・・・・・・・・・シール
６１・・・・・・・・・・・・・・第１のシール板
６２・・・・・・・・・・・・・・第２のシール板
６３・・・・・・・・・・・・・・芯金
６４・・・・・・・・・・・・・・シール部材
６５・・・・・・・・・・・・・・シール嵌合面
６６・・・・・・・・・・・・・・研削逃げ溝 1. Inward member 2, 24 ... Hub wheel 2a, 3a ... Inner rolling surface 2b, 24a ··· Small diameter step 2c ························· 2 ... Serration 3 ... Inner ring 4 ... Wheel mounting flange 5 ... ···················································································· ...... ... Seal 10, 10 '... Outer member 10a, 10a' ... Outer rolling surface 10b ...・ ・ ・ ・ ・ ・ Body mounting flange 11 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal land 12, 30 ・·········· Seal fitting surface 12 '··············· Large diameter stepped portions 13 and 17 ············ 18 ·········· Seal members 14a, 14b and 18a ··· Side lips 14c, 18b and 18c · · · Radial lip 15 ··· ... First seal plate 16 ......... Second seal plate 16a ......... Cylindrical portion 16b ... ... Standing plate parts 19, 30 '... Counterbore 20 ... Corner 21 ... ························ 22 .... Knuckle 25a ... ... Hut 26 ··········· Wheel bearing 27 ······························· Retaining rings 28, 28 ' .... Outer ring 51 ... Outer member 51a ... Outer rolling surface 51b ... Car body mounting flange 51c ... Counter bore 52 ... Hub wheels 52a, 53a ... ... Inner rolling surface 52b ... Small diameter step 52c ... Caulking part 52d ... ... serration 53 ... inner ring 54 ... inner member 55 ... ... Rolling elements 56 ..... Wheel mounting flange 5 ····································································· Retainer 59, 60 ············ First seal plate 62 ·················· Second seal plate 63・ ・ Core metal 64 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal member 65 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal fitting surface 66 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Grinding clearance groove

Claims (5)

内周に複列の外側転走面が形成された外方部材と、
前記複列の外側転走面に対向する内側転走面が形成された内方部材と、
前記両転走面間に転動自在に収容された複列の転動体と、
前記両部材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、
このシールが、鋼板からプレス加工によって円環状に形成された芯金と、この芯金に一体に加硫接着されたシール部材を有し、前記芯金が前記外方部材の端部内周に嵌合固定された車輪用軸受装置において、
前記外方部材の端部内周に予め旋削加工によりカウンタボアが形成され、このカウンタボアに円筒状のシール嵌合面が研削加工によって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 having a double row outer raceway formed on the inner periphery;
An inner member formed with an inner rolling surface facing the double row outer rolling surface;
A double row rolling element accommodated between the rolling surfaces so as to roll freely;
A seal attached to the opening of the annular space formed between the two members,
The seal has a metal core formed in an annular shape by pressing from a steel plate, and a seal member integrally vulcanized and bonded to the metal core, and the metal core is fitted to the inner periphery of the end of the outer member. In the fixed wheel bearing device,
A wheel bearing device, wherein a counter bore is formed in advance on an inner periphery of an end portion of the outer member by turning, and a cylindrical seal fitting surface is formed on the counter bore by grinding. 前記外方部材の端部内周に、前記カウンタボアから予め旋削加工により円弧状の隅部と、この隅部の接線上に大径段部が形成されると共に、この大径段部に前記シール嵌合面が形成されている請求項１に記載の車輪用軸受装置。   On the inner periphery of the end portion of the outer member, an arc-shaped corner portion is formed in advance by turning from the counter bore, and a large-diameter step portion is formed on a tangent line of the corner portion. The wheel bearing device according to claim 1, wherein a fitting surface is formed. 前記カウンタボアが所定の研削取代を残して旋削加工され、当該カウンタボアが研削加工により形成されて前記シール嵌合面とした請求項１に記載の車輪用軸受装置。   The wheel bearing device according to claim 1, wherein the counterbore is turned while leaving a predetermined grinding allowance, and the counterbore is formed by grinding to serve as the seal fitting surface. 前記シール嵌合面が前記外側転走面と一体に総型の研削砥石によって同時に研削加工されている請求項１乃至３いずれかに記載の車輪用軸受装置。   The wheel bearing device according to any one of claims 1 to 3, wherein the seal fitting surface is ground simultaneously with a grinding wheel of a total type integrally with the outer rolling surface. 前記シール嵌合面の開口部に予め旋削加工により面取り部が形成され、この面取り部が総型の研削砥石によって同時に研削加工されている請求項４に記載の車輪用軸受装置。   The wheel bearing device according to claim 4, wherein a chamfered portion is formed in advance in the opening portion of the seal fitting surface by turning, and the chamfered portion is simultaneously ground by a general grinding wheel.
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008256071A (en) * 2007-04-04 2008-10-23 Ntn Corp Bearing for wheel and bearing device for wheel having the same
JP2008256072A (en) * 2007-04-04 2008-10-23 Ntn Corp Bearing for wheel and bearing device for wheel having the same
JP2008256070A (en) * 2007-04-04 2008-10-23 Ntn Corp Bearing device for wheel
WO2008129799A1 (en) * 2007-04-04 2008-10-30 Ntn Corporation Bearing for wheel and bearing device adapted to be used for wheel and having the bearing
WO2009011129A1 (en) * 2007-07-19 2009-01-22 Ntn Corporation Bearing device having rotation speed sensor and adapted for use in wheel and method of assembling the same
JP2009052709A (en) * 2007-08-29 2009-03-12 Ntn Corp Bearing for vehicle and bearing device for vehicle
JP2009197901A (en) * 2008-02-21 2009-09-03 Ntn Corp Wheel bearing device

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JPH0811505A (en) * 1994-06-30 1996-01-16 Ntn Corp Bearing device for wheel of automobile
JP2000002251A (en) * 1998-06-12 2000-01-07 Nippon Seiko Kk Conical roller bearing
JP2001289257A (en) * 2000-04-10 2001-10-19 Ntn Corp Bearing for wheel
JP2004092830A (en) * 2002-09-02 2004-03-25 Nsk Ltd Manufacturing method for bearing unit for wheel
JP2004150483A (en) * 2002-10-29 2004-05-27 Koyo Seiko Co Ltd Rolling bearing unit

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JPH06300036A (en) * 1993-04-14 1994-10-25 Koyo Seiko Co Ltd Skew contact ball bearing
JPH0811505A (en) * 1994-06-30 1996-01-16 Ntn Corp Bearing device for wheel of automobile
JP2000002251A (en) * 1998-06-12 2000-01-07 Nippon Seiko Kk Conical roller bearing
JP2001289257A (en) * 2000-04-10 2001-10-19 Ntn Corp Bearing for wheel
JP2004092830A (en) * 2002-09-02 2004-03-25 Nsk Ltd Manufacturing method for bearing unit for wheel
JP2004150483A (en) * 2002-10-29 2004-05-27 Koyo Seiko Co Ltd Rolling bearing unit

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008256071A (en) * 2007-04-04 2008-10-23 Ntn Corp Bearing for wheel and bearing device for wheel having the same
JP2008256072A (en) * 2007-04-04 2008-10-23 Ntn Corp Bearing for wheel and bearing device for wheel having the same
JP2008256070A (en) * 2007-04-04 2008-10-23 Ntn Corp Bearing device for wheel
WO2008129799A1 (en) * 2007-04-04 2008-10-30 Ntn Corporation Bearing for wheel and bearing device adapted to be used for wheel and having the bearing
US9200669B2 (en) 2007-04-04 2015-12-01 Ntn Corporation Wheel bearing and a wheel bearing apparatus having the wheel bearing
WO2009011129A1 (en) * 2007-07-19 2009-01-22 Ntn Corporation Bearing device having rotation speed sensor and adapted for use in wheel and method of assembling the same
JP2009052709A (en) * 2007-08-29 2009-03-12 Ntn Corp Bearing for vehicle and bearing device for vehicle
JP2009197901A (en) * 2008-02-21 2009-09-03 Ntn Corp Wheel bearing device

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