JP4807804B2 - Wheel bearing device - Google Patents

Wheel bearing device Download PDF

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Publication number
JP4807804B2
JP4807804B2 JP2008024420A JP2008024420A JP4807804B2 JP 4807804 B2 JP4807804 B2 JP 4807804B2 JP 2008024420 A JP2008024420 A JP 2008024420A JP 2008024420 A JP2008024420 A JP 2008024420A JP 4807804 B2 JP4807804 B2 JP 4807804B2
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wheel
seal
mounting flange
bearing device
wheel bearing
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JP2008175395A (en
JP2008175395A5 (en
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昭吾 鈴木
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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
    • 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
    • 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
    • F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
    • F16C33/7826—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of the opposing surface cooperating with the seal, e.g. a shoulder surface of a bearing ring
    • 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
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
    • F16C33/7883—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring mounted to the inner race and of generally L-shape, the two sealing rings defining a sealing with box-shaped cross-section
    • 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
    • F16C33/7896—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members with two or more discrete sealings arranged in series
    • 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
    • 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
    • F16C33/7886—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted outside the gap between the inner and outer races, e.g. sealing rings mounted to an end face or outer surface of a race

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、密封性能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 with improved sealing performance.

従来から自動車等の車輪を支持する車輪用軸受装置は、車輪を取り付けるためのハブ輪を転がり軸受を介して回転自在に支承するもので、駆動輪用と従動輪用とがある。構造上の理由から、駆動輪用では内輪回転方式が、従動輪用では内輪回転と外輪回転の両方式が一般的に採用されている。この車輪用軸受装置には、所望の軸受剛性を有し、ミスアライメントに対しても耐久性を発揮すると共に、燃費向上の観点から回転トルクが小さい複列アンギュラ玉軸受が多用されている。一方、オフロードカーやトラック等、車体重量が嵩む車両には複列円錐ころ軸受が使用されている。   2. Description of the Related Art Conventionally, a wheel bearing device for supporting a wheel of an automobile or the like is such that a hub wheel for mounting a wheel is rotatably supported via a rolling bearing, and there are a drive wheel and a driven wheel. For structural reasons, an inner ring rotation method is generally used for driving wheels, and an inner ring rotation method and an outer ring rotation method are generally used for driven wheels. As the wheel bearing device, a double-row angular ball bearing having a desired bearing rigidity, exhibiting durability against misalignment, and having a small rotational torque from the viewpoint of improving fuel efficiency is often used. On the other hand, double row tapered roller bearings are used in vehicles such as off-road cars and trucks that have a heavy vehicle body weight.

これらの車輪用軸受装置は泥水等がかかり易い部位に配置されるため、シール装置が装着されて外方部材と内方部材との間を密封するように構成されている。一般的に、シール装置は、シールリップを備えたシール部材が固定側部材となる外方部材に装着され、シールリップが内方部材の外周面に摺接されている。特に、オフロードカーやピックアップトラック等のように、劣悪な環境で運転される車両においては、密封性をさらに向上させるための手段が種々講じられている。   Since these wheel bearing devices are arranged at sites where muddy water or the like is easily applied, a seal device is mounted to seal between the outer member and the inner member. Generally, in a sealing device, a sealing member having a sealing lip is attached to an outer member serving as a stationary member, and the sealing lip is slidably contacted with an outer peripheral surface of the inner member. In particular, in a vehicle that is driven in a poor environment such as an off-road car or a pickup truck, various means for further improving the sealing performance are taken.

こうした車輪用軸受装置の一例を図４に示す。この車輪用軸受装置は、シャーシーに固定されたナックル５１と、このナックル５１を貫通して延びるアクスル５２と、アクスル５２の周囲に嵌着され、車輪（図示せず）にボルト５３を介して締結されたハブ輪５４と、ナックル５１に固定され、ハブ輪５４およびアクスル５２を回転自在に支承する車輪用軸受５５と、空気圧により制御され、アクスル５２とハブ輪５４とを係脱させるクラッチ５６とを備えている。   An example of such a wheel bearing device is shown in FIG. The wheel bearing device includes a knuckle 51 fixed to a chassis, an axle 52 extending through the knuckle 51, and fitted around the axle 52, and fastened to a wheel (not shown) via bolts 53. A hub wheel 54, a wheel bearing 55 that is fixed to the knuckle 51 and rotatably supports the hub wheel 54 and the axle 52, and a clutch 56 that is controlled by air pressure to engage and disengage the axle 52 and the hub wheel 54. It has.

ナックル５１とアクスル５２との間には環状室（真空室）５７が形成され、アウター側の密閉室５８に設けられたクラッチ５６に連通されている。ここで、環状室５７が大気圧よりも低い場合は、クラッチ５６は負圧を受けて係合されるが、環状室５７が大気圧である場合はクラッチ５６は離脱される。環状室５７はナックル５１を斜めに貫通して延びる真空通路５９を通して真空ポンプ（図示せず）に連通している。   An annular chamber (vacuum chamber) 57 is formed between the knuckle 51 and the axle 52 and communicates with a clutch 56 provided in a sealed chamber 58 on the outer side. Here, when the annular chamber 57 is lower than the atmospheric pressure, the clutch 56 receives a negative pressure and is engaged, but when the annular chamber 57 is at the atmospheric pressure, the clutch 56 is disengaged. The annular chamber 57 communicates with a vacuum pump (not shown) through a vacuum passage 59 extending obliquely through the knuckle 51.

車輪用軸受５５は、外周にナックル５１に取り付けられるための車体取付フランジ６０ｂを一体に有し、内周にテーパ状の複列の外側転走面６０ａ、６０ａが形成された外方部材６０と、外周に複列の外側転走面６０ａ、６０ａに対向するテーパ状の内側転走面６１ａ、６２ａがそれぞれ形成された内輪６１、６２と、両転走面間に収容された複列の円錐ころ６３、６３と、これら複列の円錐ころ６３、６３を転動自在に保持する保持器６４、６４とを備えた複列円錐ころ軸受からなる。   The wheel bearing 55 is integrally provided with a vehicle body mounting flange 60b to be attached to the knuckle 51 on the outer periphery, and an outer member 60 in which tapered double-row outer rolling surfaces 60a and 60a are formed on the inner periphery. , Inner rings 61 and 62 each having tapered inner rolling surfaces 61a and 62a facing the outer circumferential surfaces of the double row outer rolling surfaces 60a and 60a, respectively, and the double row cones accommodated between the rolling surfaces. It consists of a double row tapered roller bearing provided with rollers 63, 63 and cages 64, 64 for holding these double rows of tapered rollers 63, 63 in a rollable manner.

ハブ輪５４は、一端部に車輪（図示せず）を取り付けるための車輪取付フランジ６５を一体に有し、外周に車輪取付フランジ６５から軸方向に延びる円筒状の小径段部５４ａが形成されている。車輪用軸受５５はハブ輪５４の小径段部５４ａに圧入され、固定ナット６６によって軸方向に固定されている。なお、アクスル５２とハブ輪５４との間には相対回転を許容するための滑り軸受６７が装着されている。   The hub wheel 54 integrally has a wheel mounting flange 65 for mounting a wheel (not shown) at one end, and a cylindrical small-diameter stepped portion 54a extending in the axial direction from the wheel mounting flange 65 is formed on the outer periphery. Yes. The wheel bearing 55 is press-fitted into the small diameter step portion 54 a of the hub wheel 54 and is fixed in the axial direction by a fixing nut 66. A sliding bearing 67 for allowing relative rotation is attached between the axle 52 and the hub wheel 54.

車輪用軸受５５の両端部にはシール６８、６９が装着され、外方部材６０と内輪６１、６２との間に形成される環状空間の開口部を密封すると共に、環状室５７および周囲環境から隔離している。シール６８は、外方部材６０に圧入された外側ケース７０と、内輪６１に圧入された内側ケース７１とを備えている。外側ケース７０の内縁と、内側ケース７１の外縁にはそれぞれシールリップ７０ａ、７１ａが一体接合され、内側ケース７１および外側ケース７０に摺接されている。これらシールリップ７０ａ、７１ａは、車輪用軸受５５の内部と環状室５７との間の差圧の存在下で撓み、車輪用軸受５５の内部を環状室５７へ排出させるように構成されている。したがって、車輪用軸受５５の内部は、環状室５７が排気された場合に、環状室５７と実質的に同一の圧力を受ける。   Seals 68 and 69 are attached to both ends of the wheel bearing 55 to seal the opening of the annular space formed between the outer member 60 and the inner rings 61 and 62, and from the annular chamber 57 and the surrounding environment. Isolated. The seal 68 includes an outer case 70 press-fitted into the outer member 60 and an inner case 71 press-fitted into the inner ring 61. Seal lips 70 a and 71 a are integrally joined to the inner edge of the outer case 70 and the outer edge of the inner case 71, respectively, and are in sliding contact with the inner case 71 and the outer case 70. These seal lips 70 a and 71 a are configured to bend in the presence of a differential pressure between the inside of the wheel bearing 55 and the annular chamber 57 and discharge the inside of the wheel bearing 55 to the annular chamber 57. Therefore, the inside of the wheel bearing 55 receives substantially the same pressure as the annular chamber 57 when the annular chamber 57 is exhausted.

一方、シール６９は、図５に拡大して示すように、外方部材６０に圧入された外側ケース７２と、内輪６２に圧入された内側ケース７３とを備えている。外側ケース７２の端部には、内側ケース７３に摺接するシールリップ７２ａと、車輪取付フランジ６５の側面に摺接するサイドリップ７２ｂが一体接合されている。また、内側ケース７３の外縁には外側ケース７２に摺接するシールリップ７３ａが一体接合されている。このシール６９は、車輪用軸受５５の内部が減圧圧力に保持されるように圧力差を支え、さらに、雨水やダスト等が軸受内部に侵入するのを防止する。
特表２００１−５１０５３４号公報 On the other hand, the seal 69 includes an outer case 72 press-fitted into the outer member 60 and an inner case 73 press-fitted into the inner ring 62 as shown in an enlarged view in FIG. A seal lip 72 a slidably contacting the inner case 73 and a side lip 72 b slidably contacting the side surface of the wheel mounting flange 65 are integrally joined to the end portion of the outer case 72. Further, a seal lip 73 a that is in sliding contact with the outer case 72 is integrally joined to the outer edge of the inner case 73. The seal 69 supports a pressure difference so that the inside of the wheel bearing 55 is maintained at a reduced pressure, and further prevents rainwater, dust, and the like from entering the bearing.
Special table 2001-510534 gazette

こうした従来の車輪用軸受装置では、特に、ハブ輪５４側のシール６９において、対向配置された外側ケース７２と内側ケース７３にそれぞれ摺接されるシールリップ７２ａ、７３ａに加え、車輪取付フランジ６５の側面に摺接されるサイドリップ７２ｂが外側ケース７２の外縁に接合されているので強力な密封性能が得られる。然しながら、サイドリップ７２ｂが車輪取付フランジ６５に直接摺接する構成のため、このシール摺接面を所定の面粗さに仕上げなければならなく、加工工数が嵩んでコストが高騰する。また、ハブ輪５４は炭素鋼から形成されているため錆が発生し易い。そのため、シール摺接面が劣化する可能性があり、サイドリップ７２ｂが車輪取付フランジ６５に直接摺接する構成では、サイドリップ７２ｂが摩耗し、長期間に亘って安定した密封性を保持するのは難しい。   In such a conventional wheel bearing device, in particular, in the seal 69 on the hub wheel 54 side, in addition to the seal lips 72a and 73a slidably contacted with the outer case 72 and the inner case 73, which are opposed to each other, the wheel mounting flange 65 is provided. Since the side lip 72b slidably contacted with the side surface is joined to the outer edge of the outer case 72, a strong sealing performance can be obtained. However, since the side lip 72b is in direct sliding contact with the wheel mounting flange 65, the seal sliding contact surface must be finished to a predetermined surface roughness, which increases the number of processing steps and increases the cost. Further, since the hub wheel 54 is made of carbon steel, rust is easily generated. Therefore, there is a possibility that the seal slidable contact surface may deteriorate, and in the configuration in which the side lip 72b is in direct slidable contact with the wheel mounting flange 65, the side lip 72b is worn and the stable sealing performance is maintained over a long period of time. difficult.

本発明は、このような事情に鑑みてなされたもので、シールの密封性能の向上を図り、軸受性能を長期間に亘って維持することができる車輪用軸受装置を提供することを目的としている。   This invention is made | formed in view of such a situation, and aims at the improvement of the sealing performance of a seal | sticker, and it aims at providing the wheel bearing apparatus which can maintain bearing performance over a long period of time. .

係る目的を達成すべく、本発明のうち請求項１記載の発明は、外周に懸架装置に取り付けられるための車体取付フランジを一体に有し、内周に複列の外側転走面が形成された外方部材と、一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に小径段部が形成されたハブ輪、およびこのハブ輪に嵌合された内輪または等速自在継手の外側継手部材からなり、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で形成される環状空間の両側の開口部に装着されたアウター側のシールとインナー側のシールとを備えた車輪用軸受装置において、前記外方部材のアウター側の端部外周に、前記アウター側のシールとは別体のバックアップシールが装着され、このバックアップシールが、前記外方部材のアウター側の端部外周から径方向外方に傾斜して延びるシールリップを一体に有すると共に、このシールリップが摺接する金属環が、防錆能を有する鋼板からプレス加工により円板状に形成され、当該金属環が前記車輪取付フランジのインナー側の側面の平坦面に沿って配置され、前記車輪取付フランジに植設されたハブボルトと当該車輪取付フランジとで挟持され、密着した状態で固定され、前記バックアップシールによって前記アウター側のシールの外側に密封空間が形成されている。
In order to achieve such an object, the invention according to claim 1 of the present invention has a vehicle body mounting flange integrally attached to the suspension on the outer periphery, and a double row outer rolling surface is formed on the inner periphery. The outer member and a hub wheel integrally having a wheel mounting flange for mounting a wheel at one end and a small-diameter stepped portion formed on the outer periphery, and an inner ring or a constant velocity universal joint fitted to the hub wheel An inner member in which a double row inner rolling surface facing the outer row rolling surface of the double row is formed on the outer periphery, and both rolling surfaces of the inner member and the outer member A double-row rolling element housed in a rollable manner via a cage, and an outer seal attached to openings on both sides of an annular space formed by the outer member and the inner member; In the wheel bearing device comprising an inner seal, an outer member of the outer member is provided. The end periphery, wherein the outer side of the seal is mounted a backup seal separate, the backup seal, the seal lip extending obliquely to the outer radially outward from the outer circumference of the end portion of the outer side of the member And a metal ring with which the seal lip is slidably contacted is formed into a disk shape by pressing from a steel plate having anti-corrosive ability, and the metal ring is formed on a flat surface on the inner side surface of the wheel mounting flange. Arranged between the hub bolts planted on the wheel mounting flange and the wheel mounting flange and fixed in close contact with each other, and the backup seal forms a sealed space outside the outer seal. Yes.

このように、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するハブ輪と、外方部材と内方部材および両部材間に転動自在に収容された複列の転動体を備え、両部材間に形成される環状空間の両側の開口部にアウター側のシールとインナー側のシールとが装着された第２世代乃至第４世代構造の車輪用軸受装置において、外方部材のアウター側の端部外周に、アウター側のシールとは別体のバックアップシールが装着され、このバックアップシールが、外方部材のアウター側の端部外周から径方向外方に傾斜して延びるシールリップを一体に有すると共に、このシールリップが摺接する金属環が、防錆能を有する鋼板からプレス加工により円板状に形成され、当該金属環が車輪取付フランジのインナー側の側面の平坦面に沿って配置され、前記車輪取付フランジに植設されたハブボルトと当該車輪取付フランジとで挟持され、密着した状態で固定され、前記バックアップシールによって前記アウター側のシールの外側に密封空間が形成されているので、従来のように、サイドリップの摺接部となる車輪取付フランジのインナー側の側面を別途切削加工して所定の面粗さに仕上げる必要がなく、また、劣悪な環境で使用されても、バックアップシール、金属環、車輪取付フランジ、外方部材およびアウター側のシールによって密封空間が形成されているので、アウター側のシールの密封性能の向上を図り、軸受性能を長期間に亘って維持することができる車輪用軸受装置を提供することができる。
Thus, a hub wheel integrally having a wheel mounting flange for mounting a wheel at one end, and an outer member, an inner member, and a double row rolling element accommodated so as to be freely rollable between both members, In the second-generation to fourth-generation wheel bearing device in which the outer seal and the inner seal are mounted in the openings on both sides of the annular space formed between the two members, the outer side of the outer member A backup seal that is separate from the outer seal is attached to the outer periphery of the outer end of the outer seal, and this backup seal is integrated with a seal lip that extends from the outer periphery of the outer end of the outer member so as to incline radially outward. The metal ring with which the seal lip is slidably contacted is formed into a disk shape by pressing from a steel plate having rust prevention ability, and the metal ring is along the flat surface on the side surface on the inner side of the wheel mounting flange. Since it is arranged and clamped between the hub bolt and the wheel mounting flange planted on the wheel mounting flange and fixed in close contact with each other, a sealing space is formed outside the outer seal by the backup seal. As in the past, there is no need to cut the inner side surface of the wheel mounting flange, which becomes the sliding contact portion of the side lip, and finish it to a predetermined surface roughness, and even if it is used in a poor environment, Since the sealing space is formed by the backup seal, metal ring, wheel mounting flange, outer member and outer side seal, the sealing performance of the outer side seal is improved and the bearing performance is maintained for a long period of time. It is possible to provide a wheel bearing device that can be used.

また、請求項２に記載の発明のように、前記金属環の内径部または外径部に軸方向に延びる円筒部が形成されていれば、加工時の反りを抑えると共に、ハブボルトによって車輪取付フランジに固定する時に変形するのを防止して良好なシール摺接面を得ることができる。   If the cylindrical portion extending in the axial direction is formed on the inner diameter portion or the outer diameter portion of the metal ring as in the invention described in claim 2, warpage during processing is suppressed, and a wheel mounting flange is provided by a hub bolt. Thus, it is possible to obtain a good seal sliding contact surface by preventing deformation when fixed to.

さらに好ましくは、請求項３に記載の発明のように、前記円筒部から径方向に延びる鍔部が形成されていれば、一層金属環の剛性が高くなり、加工時や固定時の反りを抑制して良好なシール摺接面を得ることができる。   More preferably, as in the invention described in claim 3, if a flange extending in the radial direction from the cylindrical portion is formed, the rigidity of the metal ring is further increased, and warpage during processing and fixing is suppressed. Thus, a good seal sliding contact surface can be obtained.

また、請求項４に記載の発明のように、前記金属環と車輪取付フランジとの間に弾性部材が介装されていれば、車輪取付フランジの側面との密着性を高めることができる。 Moreover, if the elastic member is interposed between the said metal ring and the wheel attachment flange like invention of Claim 4 , adhesiveness with the side surface of a wheel attachment flange can be improved.

本発明に係る車輪用軸受装置は、外周に懸架装置に取り付けられるための車体取付フランジを一体に有し、内周に複列の外側転走面が形成された外方部材と、一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に小径段部が形成されたハブ輪、およびこのハブ輪に嵌合された内輪または等速自在継手の外側継手部材からなり、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で形成される環状空間の両側の開口部に装着されたアウター側のシールとインナー側のシールとを備えた車輪用軸受装置において、前記外方部材のアウター側の端部外周に、前記アウター側のシールとは別体のバックアップシールが装着され、このバックアップシールが、前記外方部材のアウター側の端部外周から径方向外方に傾斜して延びるシールリップを一体に有すると共に、このシールリップが摺接する金属環が、防錆能を有する鋼板からプレス加工により円板状に形成され、当該金属環が前記車輪取付フランジのインナー側の側面の平坦面に沿って配置され、前記車輪取付フランジに植設されたハブボルトと当該車輪取付フランジとで挟持され、密着した状態で固定され、前記バックアップシールによって前記アウター側のシールの外側に密封空間が形成されているので、従来のように、サイドリップの摺接部となる車輪取付フランジのインナー側の側面を別途切削加工して所定の面粗さに仕上げる必要がなく、また、劣悪な環境で使用されても、バックアップシール、金属環、車輪取付フランジ、外方部材およびアウター側のシールによって密封空間が形成されているので、アウター側のシールの密封性能の向上を図り、軸受性能を長期間に亘って維持することができる車輪用軸受装置を提供することができる。
A wheel bearing device according to the present invention has a vehicle body mounting flange integrally attached to a suspension device on an outer periphery, an outer member having a double row outer rolling surface formed on an inner periphery, and one end portion. It consists of a hub wheel that has a wheel mounting flange for mounting the wheel and has a small diameter step on the outer periphery, and an outer joint member of the inner ring or constant velocity universal joint that is fitted to this hub wheel. An inner member in which a double row inner rolling surface facing the outer row rolling surface of the double row is formed, and rolling between the both rolling surfaces of the inner member and the outer member via a cage. A wheel having a double row rolling element accommodated freely, and an outer side seal and an inner side seal attached to openings on both sides of an annular space formed by the outer member and the inner member. in use the bearing device, the outer side of the outer circumference of the end portion of the outer member, the outer The side seals are mounted backup seal separate, the backup seal, which has a sealing lip extending obliquely radially outward from the outer circumference of the end portion of the outer side of the outer member integrally the seal A metal ring with which the lip is slidably contacted is formed into a disk shape by pressing from a steel plate having rust prevention ability, and the metal ring is arranged along a flat surface on the inner side surface of the wheel mounting flange. Since it is sandwiched between the hub bolt and the wheel mounting flange planted in the flange and fixed in close contact with each other, a sealing space is formed outside the outer seal by the backup seal. It is not necessary to cut the inner side surface of the wheel mounting flange, which is the sliding contact part of the side lip, to a predetermined surface roughness. Even when used in a poor environment, the sealing space is formed by the backup seal, metal ring, wheel mounting flange, outer member, and outer side seal, so the sealing performance of the outer side seal is improved, and the bearing A wheel bearing device capable of maintaining performance over a long period of time can be provided.

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と、このハブ輪の小径段部に圧入された車輪用軸受とからなり、この車輪用軸受が、外周に懸架装置に取り付けられるための車体取付フランジを一体に有し、内周に複列の外側転走面が形成された外方部材と、外周に前記複列の外側転走面に対向する内側転走面が形成された一対の内輪と、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、前記外方部材と内輪とで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って軸方向に固定されている車輪用軸受装置において、前記外方部材のアウター側の端部外周に、前記アウター側のシールとは別体のバックアップシールが装着され、このバックアップシールが、前記外方部材のアウター側の端部外周から径方向外方に傾斜して延びるシールリップを一体に有すると共に、このシールリップが摺接する金属環が、内径部に軸方向に延びる円筒部を有し、防錆能を有する鋼板からプレス加工により円板状に形成され、当該金属環が前記車輪取付フランジに植設されたハブボルトによってインナー側の側面に挟持された状態で固定されている。 A hub wheel having a wheel mounting flange for mounting a wheel at one end and a small diameter step portion extending in the axial direction from the wheel mounting flange is formed on the outer periphery, and the hub wheel is press-fitted into the small diameter step portion of the hub wheel. An outer member comprising a wheel bearing, the wheel bearing integrally including a vehicle body mounting flange to be attached to the suspension device on the outer periphery, and a double row outer rolling surface formed on the inner periphery; A pair of inner races formed on the outer periphery with an inner raceway facing the outer raceway of the double row, and a double row rolling element housed between the raceways via a cage between the raceways. A seal mounted in an opening of an annular space formed by the outer member and the inner ring, and a shaft formed by a crimping portion formed by plastically deforming an end portion of the small diameter step portion radially outward. In the wheel bearing device fixed in the direction, the outer side of the outer member The end portion outer periphery, wherein the outer side of the seal is mounted a backup seal separate, the backup seal, the seal lip extending obliquely radially outward from the outer circumference of the end portion of the outer side of the outer member The metal ring with which the seal lip is slidably contacted has a cylindrical portion extending in the axial direction on the inner diameter portion, and is formed into a disk shape by press working from a steel plate having anti-corrosion ability. It is fixed in a state of being sandwiched by the side face on the inner side by a hub bolt planted on the wheel mounting flange.

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一実施形態を示す縦断面図、図２は、図１の要部拡大図である。なお、以下の説明では、車両に組み付けた状態で車両の外側寄りとなる側をアウター側（図面左側）、中央寄り側をインナー側（図面右側）という。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an embodiment of a wheel bearing device according to the present invention, and FIG. 2 is an enlarged view of a main part of FIG. In the following description, the side closer to the outer side of the vehicle in a state assembled to the vehicle is referred to as the outer side (left side in the drawing), and the side closer to the center is referred to as the inner side (right side in the drawing).

この車輪用軸受装置は第２世代と呼称される駆動輪用であって、ハブ輪１と車輪用軸受２とからなり、車輪用軸受２は、外方部材３と、複列の転動体（円錐ころ）４、４を介して内嵌された一対の内輪５、５とを備えている。   This wheel bearing device is for a drive wheel called a second generation, and is composed of a hub wheel 1 and a wheel bearing 2, and the wheel bearing 2 is composed of an outer member 3, a double row rolling element ( A pair of inner rings 5 and 5 that are fitted through tapered rollers 4 and 4.

ハブ輪１は、一端部に車輪（図示せず）を取り付けるための車輪取付フランジ６を一体に有し、この車輪取付フランジ６から軸方向に延びる小径段部１ａ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）１ｂが形成されている。車輪取付フランジ６にはハブボルト６ａが周方向等配に植設されている。車輪用軸受２は、ハブ輪１の小径段部１ａに所定のシメシロを介して圧入され、小径段部１ａの端部を径方向外方に塑性変形させて形成した加締部１ｃによってハブ輪１に対して軸方向に固定されている。   The hub wheel 1 integrally has a wheel mounting flange 6 for mounting a wheel (not shown) at one end portion, and a small-diameter step portion 1a extending in the axial direction from the wheel mounting flange 6 is formed. A serration (or spline) 1b for transmission is formed. Hub bolts 6a are planted on the wheel mounting flange 6 at equal intervals in the circumferential direction. The wheel bearing 2 is press-fitted into the small-diameter step portion 1a of the hub wheel 1 via a predetermined shimiro, and the hub wheel is formed by a caulking portion 1c formed by plastically deforming an end portion of the small-diameter step portion 1a radially outward. 1 is fixed in the axial direction.

ハブ輪１はＳ５３Ｃ等の炭素０．４０〜０．８０ｗｔ％を含む中炭素鋼で形成され、車輪取付フランジ６のインナー側に円弧状に形成された基部６ｂから肩部１ｄを介して小径段部１ａ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。これにより、車輪取付フランジ６に負荷される回転曲げ荷重に対して充分な機械的強度を有し、内輪５、５の嵌合部となる小径段部１ａの耐フレッティング性が向上する。   The hub wheel 1 is made of medium carbon steel containing 0.40 to 0.80 wt% of carbon, such as S53C, and has a small diameter step from a base 6b formed in an arc shape on the inner side of the wheel mounting flange 6 via a shoulder 1d. The surface hardness is hardened in the range of 58 to 64 HRC by induction hardening over the part 1a. Thereby, it has sufficient mechanical strength with respect to the rotational bending load applied to the wheel mounting flange 6, and the fretting resistance of the small-diameter step portion 1 a serving as the fitting portion of the inner rings 5, 5 is improved.

車輪用軸受２の外方部材３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３ｂ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３ａ、３ａが一体に形成されている。この外方部材３はＳ５３Ｃ等の炭素０．４０〜０．８０ｗｔ％を含む中炭素鋼で形成され、複列の外側転走面３ａ、３ａが高周波焼入れによって表面硬さを５８〜６４ＨＲＣの範囲に硬化処理されている。   The outer member 3 of the wheel bearing 2 has a vehicle body mounting flange 3b integrally attached to a knuckle (not shown) on the outer periphery, and the outer side of the tapered double row that opens outward on the inner periphery. The rolling surfaces 3a and 3a are integrally formed. This outer member 3 is formed of medium carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, and the double row outer rolling surfaces 3a and 3a have a surface hardness in the range of 58 to 64HRC by induction hardening. Has been cured.

一方、内輪５の外周には、前記複列の外側転走面３ａ、３ａに対向するテーパ状の内側転走面５ａと、この内側転走面５ａの大径側に転動体４を案内する大鍔５ｂ、および小径側に転動体４の脱落を防止するための小鍔５ｃがそれぞれ形成されている。内輪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。そして、外方部材３と一対の内輪５、５の両転走面間に複列の転動体４、４が収容され、保持器７、７によって転動自在に保持されている。この車輪用軸受２は、ハブ輪１の肩部１ｄに当接され、内輪５の小鍔５ｃがそれぞれ突合せ状態で衝合する、所謂背面合せタイプの複列円錐ころ軸受から構成されている。   On the other hand, on the outer periphery of the inner ring 5, the tapered inner rolling surface 5a facing the double row outer rolling surfaces 3a, 3a and the rolling element 4 are guided to the larger diameter side of the inner rolling surface 5a. A large collar 5b and a small collar 5c for preventing the rolling element 4 from falling off are formed on the small diameter side. The inner ring 5 is made of high carbon chrome steel such as SUJ2, and is hardened in the range of 58 to 64 HRC up to the core part by quenching. And the double-row rolling elements 4 and 4 are accommodated between both rolling surfaces of the outer member 3 and a pair of inner ring | wheels 5 and 5, and are hold | maintained by the holder | retainers 7 and 7 so that rolling is possible. The wheel bearing 2 is constituted by a so-called back-to-back type double row tapered roller bearing that abuts against the shoulder 1d of the hub wheel 1 and in which the small flanges 5c of the inner ring 5 abut each other in a butted state.

また、外方部材３と内輪５との間に形成される環状空間の開口部にはシール８、８が装着されている。これらのシール８、８によって、軸受内部に封入されたグリースの外部への漏洩と、外部から雨水やダスト等が軸受内部に侵入するのを防止している。このシール８は、図２に拡大して示すように、断面が略Ｌ字状をなして互いに対向配置された環状のシール板９とスリンガ１０とからなる、所謂パックシールを構成している。シール板９は、外方部材３の端部内周に圧入される芯金１１と、この芯金１１に一体に加硫接着されたシール部材１２とからなる。芯金１１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）からプレス加工にて断面が略Ｌ字状に形成されている。   Further, seals 8 and 8 are attached to an opening of an annular space formed between the outer member 3 and the inner ring 5. These seals 8 and 8 prevent the grease sealed inside the bearing from leaking to the outside and preventing rainwater, dust, etc. from entering the bearing from the outside. As shown in FIG. 2 in an enlarged manner, the seal 8 constitutes a so-called pack seal comprising an annular seal plate 9 and a slinger 10 which are substantially L-shaped in cross section and arranged to face each other. The seal plate 9 includes a metal core 11 that is press-fitted into the inner periphery of the end of the outer member 3, and a seal member 12 that is integrally vulcanized and bonded to the metal core 11. The core 11 has a substantially L-shaped cross section by press working from 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). Is formed.

一方、スリンガ１０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）からプレス加工にて断面が略Ｌ字状に形成され、内輪５の大鍔５ｂに圧入される円筒部１０ａと、この円筒部１０ａから径方向外方に延びる立板部１０ｂとからなる。そして、シール部材１２に一体に形成された一対のサイドリップ１２ａ、１２ｂがこのスリンガ１０の立板部１０ｂに摺接すると共に、円筒部１０ａにはラジアルリップ１２ｃが摺接している。   On the other hand, the slinger 10 has a substantially L-shaped cross section by pressing from 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). The cylindrical portion 10a is press-fitted into the large collar 5b of the inner ring 5, and the upright plate portion 10b extends radially outward from the cylindrical portion 10a. A pair of side lips 12a and 12b formed integrally with the seal member 12 are in sliding contact with the standing plate portion 10b of the slinger 10, and a radial lip 12c is in sliding contact with the cylindrical portion 10a.

ここで、本実施形態では、前述した一対のシール８、８に加えて、さらに外方部材３の端部外周にバックアップシール１３が圧入されている。このバックアップシール１３は、芯金１４と、この芯金１４に一体に加硫接着されたシール部材１５とからなる。芯金１４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）からプレス加工にて断面が略Ｌ字状に形成されている。一方、シール部材１５は、芯金１４の外縁に固着された基部１５ａと、この基部１５ａから径方向外方に傾斜して延び、先端部が拡径するラッパ状に形成されたサイドリップ１５ｂとからなる。このサイドリップ１５ｂは、車輪取付フランジ６のインナー側の側面６ｃに装着された金属環１６に摺接され、雨水やダスト等が前記シール８に直接侵入するのを防止している。したがって、ハブ輪１と車輪用軸受２との間の狭い環状空間に泥水等が滞留し、車輪取付フランジ６の基部６ｂが発錆して耐久強度が低下するのを防止することができる。   Here, in this embodiment, in addition to the pair of seals 8 and 8 described above, a backup seal 13 is press-fitted to the outer periphery of the end portion of the outer member 3. The backup seal 13 includes a metal core 14 and a seal member 15 that is integrally vulcanized and bonded to the metal core 14. The core 14 has a substantially L-shaped cross section by pressing from an austenitic stainless steel plate (JIS standard SUS304, etc.) or a rust-proof cold rolled steel plate (JIS standard SPCC, etc.). Is formed. On the other hand, the seal member 15 includes a base portion 15a fixed to the outer edge of the core metal 14, and a side lip 15b formed in a trumpet shape that extends from the base portion 15a so as to incline radially outward and whose tip portion expands in diameter. Consists of. The side lip 15b is slidably contacted with a metal ring 16 mounted on the inner side surface 6c of the wheel mounting flange 6 to prevent rainwater, dust, and the like from directly entering the seal 8. Accordingly, it is possible to prevent muddy water or the like from staying in the narrow annular space between the hub wheel 1 and the wheel bearing 2 and rusting the base portion 6b of the wheel mounting flange 6 to reduce the durability.

金属環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）からプレス加工にて形成され、ハブボルト６ａによって車輪取付フランジ６に挟持された状態で固定されている。なお、金属環１６は、車輪取付フランジ６のインナー側の側面６ｃとの密着性を高めるために、図示しないパッキンを介して固定されるのが好ましい。   The metal ring 16 is formed by press working from 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 is formed by a hub bolt 6a. It is fixed in a state of being sandwiched between the wheel mounting flanges 6. The metal ring 16 is preferably fixed via a packing (not shown) in order to improve the adhesion to the inner side surface 6c of the wheel mounting flange 6.

この金属環１６は、内径部に軸方向に延びる円筒部１ａを有する断面略Ｌ字状に形成され、全体として円板状に形成されると共に、所定の表面硬さと面粗さに仕上げられている。これにより、プレス加工時の反りを抑えて全体の剛性を高めると共に、ハブボルト６ａによって車輪取付フランジ６に固定する時に変形するのを防止し、平面度を確保して良好なシール摺接面を得ることができる。したがって、従来のように、サイドリップの摺接部となる車輪取付フランジのインナー側の側面を別途切削加工して所定の面粗さに仕上げる必要がなく、劣悪な環境で使用されても、シール８の密封性能の向上を図り、軸受性能を長期間に亘って維持することができる車輪用軸受装置を提供することができる。   The metal ring 16 is formed in a substantially L-shaped cross section having a cylindrical portion 1a extending in the axial direction at the inner diameter portion, and is formed into a disk shape as a whole, and finished to a predetermined surface hardness and surface roughness. Yes. This suppresses warpage during press working and increases the overall rigidity, prevents deformation when the hub bolt 6a is fixed to the wheel mounting flange 6, and ensures a flatness to obtain a good seal sliding contact surface. be able to. Therefore, unlike the conventional case, it is not necessary to cut the inner side surface of the wheel mounting flange, which is the sliding contact portion of the side lip, and finish it to a predetermined surface roughness. Thus, it is possible to provide a wheel bearing device capable of improving the sealing performance of No. 8 and maintaining the bearing performance over a long period of time.

なお、ここでは、駆動輪側の第２世代構造を例示したが、本発明に係る車輪用軸受装置はこれに限らず、第３または第４世代構造であっても良い。また、従動輪側であっても良い。さらに、本実施形態では、転動体４に円錐ころを使用した複列円錐ころ軸受を例示したが、無論これに限らず、転動体にボールを使用した複列アンギュラ玉軸受であっても良い。   In addition, although the 2nd generation structure by the side of a drive wheel was illustrated here, the wheel bearing apparatus which concerns on this invention is not restricted to this, A 3rd or 4th generation structure may be sufficient. Moreover, the driven wheel side may be sufficient. Furthermore, in this embodiment, the double row tapered roller bearing using the tapered roller as the rolling element 4 is exemplified, but it is needless to say that the double row angular contact ball bearing using a ball as the rolling element may be used.

図３（ａ）、（ｂ）は、本発明に係るバックアップシールの変形例を示す要部拡大図である。なお、前述した実施形態と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詳細な説明を省略する。   3 (a) and 3 (b) are enlarged views of the main part showing a modification of the backup seal according to the present invention. In addition, the same code | symbol is attached | subjected to the part which has the same components or same function as embodiment mentioned above, and detailed description is abbreviate | omitted.

図３（ａ）に示す金属環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）からプレス加工にて形成され、ハブボルト６ａによって車輪取付フランジ６に挟持された状態で固定されている。この金属環１７は、外径部に軸方向に延びる円筒部１７ａを有する断面略Ｌ字状に形成され、全体として円板状に形成されている。これにより、前述した実施形態と同様、加工時の反りを抑えると共に、ハブボルト６ａによって車輪取付フランジ６に固定する時に変形するのを防止して良好なシール摺接面を得ることができる。   The metal ring 17 shown in FIG. 3A is used for press working from 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 is fixed in a state of being sandwiched between the wheel mounting flanges 6 by hub bolts 6a. The metal ring 17 is formed in a substantially L-shaped cross section having a cylindrical portion 17a extending in the axial direction at the outer diameter portion, and is formed in a disk shape as a whole. As a result, as in the above-described embodiment, it is possible to suppress warping during processing and to prevent deformation when being fixed to the wheel mounting flange 6 by the hub bolt 6a, thereby obtaining a good seal sliding contact surface.

図３（ｂ）に示すバックアップシール１９は基本的には前述したものと同様で、金属環１８の鍔部１８ｂに摺接するサイドリップ２０ｂの形状・寸法が変更されている点のみが異なる。すなわち、バックアップシール１９は、芯金１４と、この芯金１４に一体に加硫接着されたシール部材２０とからなり、このシール部材２０は、芯金１４の外縁に固着された基部２０ａと、この基部２０ａから径方向外方に傾斜して延び、先端部が拡径するラッパ状に形成されたサイドリップ２０ｂとからなる。そして、このサイドリップ２０ｂが、後述する金属環１８の鍔部１８ｂに摺接している。   The backup seal 19 shown in FIG. 3B is basically the same as that described above, except that the shape and dimensions of the side lip 20b that is in sliding contact with the flange portion 18b of the metal ring 18 are changed. That is, the backup seal 19 includes a metal core 14 and a seal member 20 that is integrally vulcanized and bonded to the metal core 14, and the seal member 20 includes a base portion 20 a fixed to the outer edge of the metal core 14, and The base portion 20a includes a side lip 20b formed in a trumpet shape extending in a radially outward direction and having a distal end portion having a larger diameter. The side lip 20b is in sliding contact with a flange portion 18b of a metal ring 18 described later.

一方、金属環１８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）からプレス加工にて形成され、ハブボルト６ａによって車輪取付フランジ６に固定されている。この金属環１８は、内径部に軸方向に延びる円筒部１８ａと、この円筒部１８ａから径方向内方に延びる鍔部１８ｂを有し、全体として円板状に形成されている。これにより、一層金属環１８の剛性が高くなり、加工時や固定時の反りを抑制して良好なシール摺接面を得ることができる。   On the other hand, the metal ring 18 is formed by pressing from 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 fixed to the wheel mounting flange 6 by 6a. The metal ring 18 has a cylindrical portion 18a extending in the axial direction at the inner diameter portion and a flange portion 18b extending radially inward from the cylindrical portion 18a, and is formed in a disk shape as a whole. Thereby, the rigidity of the metal ring 18 is further increased, and it is possible to obtain a good seal sliding contact surface while suppressing warpage during processing or fixing.

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２乃至第４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 second to fourth 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一実施形態を示す縦断面図である。It is a longitudinal section showing one embodiment of a wheel bearing device concerning the present invention. 図１の要部拡大図である。It is a principal part enlarged view of FIG. （ａ）、（ｂ）は、バックアップシールの変形例を示す要部拡大図である。(A), (b) is a principal part enlarged view which shows the modification of a backup seal | sticker. 従来の車輪用軸受装置を示す縦断面図である。It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus. 図４の要部拡大図である。It is a principal part enlarged view of FIG.

符号の説明Explanation of symbols

１・・・・・・・・・・・・・・・・ハブ輪
１ａ・・・・・・・・・・・・・・・小径段部
１ｂ・・・・・・・・・・・・・・・セレーション
１ｃ・・・・・・・・・・・・・・・加締部
１ｄ・・・・・・・・・・・・・・・肩部
２・・・・・・・・・・・・・・・・車輪用軸受
３・・・・・・・・・・・・・・・・外方部材
３ａ・・・・・・・・・・・・・・・外側転走面
３ｂ・・・・・・・・・・・・・・・車体取付フランジ
４・・・・・・・・・・・・・・・・転動体
５・・・・・・・・・・・・・・・・内輪
５ａ・・・・・・・・・・・・・・・内側転走面
５ｂ・・・・・・・・・・・・・・・大鍔
５ｃ・・・・・・・・・・・・・・・小鍔
６・・・・・・・・・・・・・・・・車輪取付フランジ
６ａ・・・・・・・・・・・・・・・ハブボルト
６ｂ・・・・・・・・・・・・・・・基部
６ｃ・・・・・・・・・・・・・・・インナー側の側面
７・・・・・・・・・・・・・・・・保持器
８・・・・・・・・・・・・・・・・シール
９・・・・・・・・・・・・・・・・シール板
１０・・・・・・・・・・・・・・・スリンガ
１０ａ・・・・・・・・・・・・・・円筒部
１０ｂ・・・・・・・・・・・・・・立板部
１１、１４・・・・・・・・・・・・芯金
１２、１５、２０・・・・・・・・・シール部材
１２ａ、１２ｂ、１５ｂ、２０ｂ・・サイドリップ
１２ｃ・・・・・・・・・・・・・・ラジアルリップ
１３、１９・・・・・・・・・・・・バックアップシール
１５ａ、２０ａ・・・・・・・・・・基部
１６、１７、１８・・・・・・・・・金属環
１６ａ、１７ａ、１８ａ・・・・・・円筒部
１８ｂ・・・・・・・・・・・・・・鍔部
５１・・・・・・・・・・・・・・・ナックル
５２・・・・・・・・・・・・・・・アクスル
５３・・・・・・・・・・・・・・・ボルト
５４・・・・・・・・・・・・・・・ハブ輪
５４ａ・・・・・・・・・・・・・・小径段部
５５・・・・・・・・・・・・・・・車輪用軸受
５６・・・・・・・・・・・・・・・クラッチ
５７・・・・・・・・・・・・・・・環状室
５８・・・・・・・・・・・・・・・密閉室
５９・・・・・・・・・・・・・・・真空通路
６０・・・・・・・・・・・・・・・外方部材
６０ａ・・・・・・・・・・・・・・外側転走面
６０ｂ・・・・・・・・・・・・・・車体取付フランジ
６１、６２・・・・・・・・・・・・内輪
６１ａ、６２ａ・・・・・・・・・・内側転走面
６３・・・・・・・・・・・・・・・円錐ころ
６４・・・・・・・・・・・・・・・保持器
６５・・・・・・・・・・・・・・・車輪取付フランジ
６６・・・・・・・・・・・・・・・固定ナット
６７・・・・・・・・・・・・・・・滑り軸受
６８、６９・・・・・・・・・・・・シール
７０、７２・・・・・・・・・・・・外側ケース
７０ａ、７１ａ、７２ａ、７３ａ・・シールリップ
７１、７３・・・・・・・・・・・・内側ケース
７２ｂ・・・・・・・・・・・・・・サイドリップ 1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 1a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step 1b ・ ・ ・ ・ ・ ・··· Serration 1c ···············································································・ ・ ・ ・ ・ ・ ・ ・ ・ Bearing bearing 3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outside member 3a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outward rolling Running surface 3b ······ Body mounting flange 4 ············ Rolling element 5 .... Inner ring 5a ... Inner rolling surface 5b ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small 6 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 6a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Hub bolt 6b ... Base 6c ... Side 7 on the inner side ...・ ・ ・ ・ ・ Cage 8 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal plate 10 ・ ・ ・······· Slinger 10a ·························································· ········ Core 12, 12, 20 ··········· Sealing members 12a, 12b, 15b, 20b ··· Side lip 12c ······· Radial lip 13, 19 ... Backup seal 15a, 20a ... Base 16, 17, 18 ... ..Metal rings 16a, 17a, 8a ··· Cylindrical portion 18b ·························· 51 ... Axle 53 ... Bolt 54 ... Hub wheel 54a ... ········· Small diameter step 55 ············· Wheel bearing 56 ···················· 57・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Annular chamber 58 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ sealed chamber 59 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ Vacuum passage 60 ・ ・ ・ ・ ・ ・ Outer member 60a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer rolling surface 60b ・ ・ ・ ・ ・ ・ ・ ・.... Body mounting flanges 61, 62 ..... Inner rings 61a, 62a ...・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 63 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Taper roller 64 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Retainer 65 ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 66 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fixing nut 67 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ Sliding bearings 68, 69... Seal 70, 72...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner case 72b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Side lip

Claims (4)

外周に懸架装置に取り付けられるための車体取付フランジを一体に有し、内周に複列の外側転走面が形成された外方部材と、
一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に小径段部が形成されたハブ輪、およびこのハブ輪に嵌合された内輪または等速自在継手の外側継手部材からなり、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で形成される環状空間の両側の開口部に装着されたアウター側のシールとインナー側のシールとを備えた車輪用軸受装置において、
前記外方部材のアウター側の端部外周に、前記アウター側のシールとは別体のバックアップシールが装着され、このバックアップシールが、前記外方部材のアウター側の端部外周から径方向外方に傾斜して延びるシールリップを一体に有すると共に、このシールリップが摺接する金属環が、防錆能を有する鋼板からプレス加工により円板状に形成され、当該金属環が前記車輪取付フランジのインナー側の側面の平坦面に沿って配置され、前記車輪取付フランジに植設されたハブボルトと当該車輪取付フランジとで挟持され、密着した状態で固定され、前記バックアップシールによって前記アウター側のシールの外側に密封空間が形成されていることを特徴とする車輪用軸受装置。 An outer member integrally having a vehicle body mounting flange to be attached to the suspension device on the outer periphery, and having a double row outer rolling surface formed on the inner periphery;
It consists of a hub wheel that has a wheel mounting flange for mounting a wheel at one end and a small-diameter step on the outer periphery, and an outer ring member of an inner ring or constant velocity universal joint that is fitted to this hub ring. An inner member in which a double row inner rolling surface facing the double row outer rolling surface is formed 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;
In the wheel bearing device provided with the outer side seal and the inner side seal mounted on the openings on both sides of the annular space formed by the outer member and the inner member,
A backup seal that is separate from the outer seal is attached to the outer periphery of the outer end of the outer member, and this backup seal is radially outward from the outer periphery of the outer end of the outer member. And a metal ring with which the seal lip is slidably contacted is formed into a disk shape by pressing from a steel plate having rust prevention ability, and the metal ring is formed on the inner side of the wheel mounting flange. Is arranged along the flat surface of the side surface, and is sandwiched between the hub bolt and the wheel mounting flange planted on the wheel mounting flange and fixed in close contact with each other, and the outer side of the outer side seal by the backup seal A wheel bearing device characterized in that a sealed space is formed in the wheel. 前記金属環の内径部または外径部に軸方向に延びる円筒部が形成されている請求項１に記載の車輪用軸受装置。   The wheel bearing device according to claim 1, wherein a cylindrical portion extending in an axial direction is formed on an inner diameter portion or an outer diameter portion of the metal ring. 前記円筒部から径方向に延びる鍔部が形成されている請求項２に記載の車輪用軸受装置。   The wheel bearing device according to claim 2, wherein a flange portion extending in a radial direction from the cylindrical portion is formed. 前記金属環と車輪取付フランジとの間に弾性部材が介装されている請求項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 an elastic member is interposed between the metal ring and a wheel mounting flange.
JP2008024420A 2008-02-04 2008-02-04 Wheel bearing device Expired - Fee Related JP4807804B2 (en)

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JP2015052350A (en) * 2013-09-06 2015-03-19 内山工業株式会社 Bearing seal
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JP2004316853A (en) * 2003-04-18 2004-11-11 Nsk Ltd Bearing device for railroad vehicle
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