JP4812112B2 - Wheel bearing device - Google Patents

Wheel bearing device Download PDF

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Publication number
JP4812112B2
JP4812112B2 JP2007014578A JP2007014578A JP4812112B2 JP 4812112 B2 JP4812112 B2 JP 4812112B2 JP 2007014578 A JP2007014578 A JP 2007014578A JP 2007014578 A JP2007014578 A JP 2007014578A JP 4812112 B2 JP4812112 B2 JP 4812112B2
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Japan
Prior art keywords
seal
wheel
backup
bearing device
fitted
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JP2008180300A (en
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昭吾 鈴木
晃司 亀高
直志 服部
貴久夫 深田
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NTN Corp
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NTN Corp
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72Sealings
    • F16C33/76Sealings of ball or roller bearings
    • F16C33/78Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7896Sealings 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72Sealings
    • F16C33/76Sealings of ball or roller bearings
    • F16C33/78Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869Sealings 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
    • F16C33/7879Sealings 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
    • F16C33/7883Sealings 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72Sealings
    • F16C33/76Sealings of ball or roller bearings
    • F16C33/78Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7886Sealings 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14Bearings 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
    • F16C19/18Bearings 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
    • F16C19/181Bearings 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
    • F16C19/183Bearings 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
    • F16C19/184Bearings 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
    • F16C19/186Bearings 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22Bearings 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
    • F16C19/34Bearings 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
    • F16C19/38Bearings 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
    • F16C19/383Bearings 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
    • F16C19/385Bearings 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
    • F16C19/386Bearings 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00Articles relating to transporting
    • F16C2326/01Parts of vehicles in general
    • F16C2326/02Wheel hubs or castors

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、シールの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 that rotatably supports a wheel of an automobile or the like, and more particularly to a wheel bearing device that improves the sealing performance of a seal.

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、外方部材と内方部材との間に形成される環状空間の開口部にシールが装着されている。これらのシールの中でも特に密封性を高めたシールとして、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に装着されたスリンガに摺接されている、所謂ハイパックシールが一般的に使用されている。   Since these wheel bearing devices are disposed at sites where muddy water or the like is easily applied, a seal is attached to an opening of an annular space formed between the outer member and the inner member. Among these seals, as a seal with particularly high sealing performance, a seal member provided with a seal lip is attached to an outer member serving as a stationary member, and the seal lip is slidably contacted with a slinger attached to the inner member. So-called high pack seals are commonly used.

この種のハイパックシールに関しては従来から種々提案されているが、こうしたシールの代表的な一例を図7に示す。このシールは、相対回転する軸受内輪等からなる内周側部材51と軸受外輪等からなる外周側部材52との間を密封し、内周側部材51および外周側部材52に各々取り付けられて互いに対向する断面L字状で環状のシール板53および密封要素54からなる。   Various types of high pack seals have been proposed in the past, and a typical example of such a seal is shown in FIG. This seal seals between the inner peripheral side member 51 composed of a bearing inner ring or the like that rotates relative to the outer peripheral side member 52 composed of a bearing outer ring or the like, and is attached to the inner peripheral side member 51 and the outer peripheral side member 52, respectively. It consists of an annular sealing plate 53 and a sealing element 54 having an L-shaped cross section facing each other.

シール板53は、内周側部材51の外径面に圧入された円筒部53aと、この円筒部53aから立ち上がった立板部53bと、この立板部53bの先端に内側に傾斜して形成された傾斜板部53cとを有している。このシール板53はスリンガとなるもので、鋼板からプレス加工によって形成されている。   The seal plate 53 is formed with a cylindrical portion 53a press-fitted into the outer diameter surface of the inner peripheral side member 51, a standing plate portion 53b rising from the cylindrical portion 53a, and an inwardly inclined tip at the standing plate portion 53b. And an inclined plate portion 53c. The seal plate 53 serves as a slinger and is formed from a steel plate by pressing.

密封要素54は、断面L字状の鋼板製の基板55にゴムまたは合成樹脂等の弾性体56を設けたものであって、基板55の円筒部55aを外周側部材52の内径面に圧入することによって取り付けられている。基板55の立板部55bは、先端に内側に傾斜する傾斜片部55cを有している。弾性体56は、基板55の内側を覆って設けられ、第1、第2のサイドリップ56a、56bと、1枚のラジアルリップ56cとを有している。   The sealing element 54 is a steel plate 55 having an L-shaped cross section provided with an elastic body 56 such as rubber or synthetic resin, and the cylindrical portion 55 a of the substrate 55 is press-fitted into the inner diameter surface of the outer peripheral member 52. Is attached by. The standing plate portion 55b of the substrate 55 has an inclined piece portion 55c inclined inward at the tip. The elastic body 56 is provided so as to cover the inside of the substrate 55, and includes first and second side lips 56a and 56b, and one radial lip 56c.

第1のサイドリップ56aは、基板55の立板部55bから斜め外径側に延びて先端がシール板53の傾斜板部53cに摺接し、第2のサイドリップ56bは、立板部55bの先端付近から斜め外径側に延びて先端がシール板53の立板部53bに摺接している。一方、ラジアルリップ56cは、立板部55bの先端からシール板53の立板部53bと反対側の斜め内径側に延び、先端がシール板53の円筒部53aに摺接している。   The first side lip 56a extends from the upright plate portion 55b of the substrate 55 to the oblique outer diameter side, the tip thereof is in sliding contact with the inclined plate portion 53c of the seal plate 53, and the second side lip 56b is connected to the upright plate portion 55b. The tip extends from the vicinity of the tip to the oblique outer diameter side and the tip is in sliding contact with the standing plate portion 53 b of the seal plate 53. On the other hand, the radial lip 56 c extends from the tip of the standing plate portion 55 b to the oblique inner diameter side opposite to the standing plate portion 53 b of the seal plate 53, and the tip is in sliding contact with the cylindrical portion 53 a of the seal plate 53.

このシール50に飛散した泥水等は、シール板53の内面に摺接する第1のサイドリップ56aの外面に付着するが、シール板53の立板部53bの外径部に傾斜板部53cが設けられているため、泥水等の溜まる空間Sは、極力小さく抑えられる。そのため、泥水等に含まれる泥や砂等の異物で第1のサイドリップ56aのシール機能が低下するのが緩和される。   The muddy water or the like scattered on the seal 50 adheres to the outer surface of the first side lip 56a that is in sliding contact with the inner surface of the seal plate 53, but the inclined plate portion 53c is provided on the outer diameter portion of the standing plate portion 53b of the seal plate 53. Therefore, the space S in which muddy water or the like accumulates can be kept as small as possible. Therefore, it is alleviated that the sealing function of the first side lip 56a is lowered by foreign matters such as mud and sand contained in the muddy water.

内周側部材51が回転側となる場合は、シールの空間S内にある泥水の水分あるいは異物を遠心力により振り切り、密封力を下げることなく迅速に排除する作用が得られる。これによって、その内方に泥水が浸入した場合、第1のサイドリップ56aよりも内径側でシール板53に摺接する第2のサイドリップ56bにより高い密封性が得られる。また、これよりもさらに内側にラジアルリップ56cがあるため、外部からの泥水等の浸入防止を3重に行うと共に、内部の潤滑剤に対する密封作用が得られる。
特開平9−292032号公報
When the inner peripheral side member 51 is on the rotation side, the action of removing the moisture or foreign matter in the muddy water in the seal space S by centrifugal force and quickly removing it without lowering the sealing force can be obtained. Thereby, when muddy water infiltrates inward, higher sealing performance is obtained by the second side lip 56b slidably contacting the seal plate 53 on the inner diameter side than the first side lip 56a. Further, since the radial lip 56c is located further inside than this, the infiltration of muddy water and the like from the outside is tripled and a sealing action against the internal lubricant is obtained.
Japanese Patent Laid-Open No. 9-292032

こうした従来のシール50では、シール50の空間S内にある泥水の水分等を遠心力により振り切ると共に、内方に泥水が浸入したとしても、第1および第2のサイドリップ56a、56b、さらにその内側のラジアルリップ56cにより、外部からの泥水等の浸入防止を3重に行い、高い密封作用が得られる。然しながら、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、このような構成のシール50でも泥水性能が不足し、さらなる密封性の向上が要求されている。   In such a conventional seal 50, the water and the like of the muddy water in the space S of the seal 50 is shaken off by the centrifugal force, and even if the muddy water enters inside, the first and second side lips 56a and 56b, The inner radial lip 56c prevents the intrusion of muddy water from the outside in triplicate and provides a high sealing action. However, particularly in a vehicle that is operated in a poor environment such as an off-road car or a pickup truck, the muddy water performance is insufficient even with the seal 50 having such a configuration, and further improvement in sealing performance is required.

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一体に形成された外方部材と、一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に嵌合された少なくとも一つの内輪からなり、外周に前記複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、この内方部材と前記外方部材の両転走面間に保持器を介して転動自在に収容された複列の転動体と、前記外方部材と内方部材と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た車輪用軸受装置において、前記シールのうちインナー側のシールが、断面が略L字状をなして互いに対向配置され、前記外方部材の端部内周に圧入された芯金と、この芯金に一体に接合されたシール部材とからなる環状のシール板、および前記内輪の外周に圧入されたスリンガとからなる複合型のシールで構成され、前記シール部材が前記スリンガに摺接するサイドリップを有すると共に、当該シールの外方側にバックアップシールが設けられ、このバックアップシールが、前記外方部材の端部外周に圧入される円筒状の嵌合部と、この嵌合部から前記外方部材の端面に沿って径方向内方に延びる円板部とを備えた芯金、およびこの芯金に一体に接合されたシール部材からなり、このシール部材が、径方向内方に傾斜して延びて前記スリンガの外側面に摺接するシールリップを一体に有し、当該バックアップシールのシール部材の基部が、前記シール板におけるシール部材に対向配置され、これら基部とシール部材の一方に軸方向に突出した舌片が形成され、この舌片が他方の部材に弾性接触している。
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 integrally on the inner periphery. A hub wheel having a formed outer member and a wheel mounting flange for mounting a wheel at one end and having a small-diameter step portion formed on the outer periphery, and a small-diameter step portion of the hub wheel. An inner member comprising at least one inner ring and formed on the outer periphery with a double-row inner rolling surface facing the double-row outer rolling surface, and both rolling surfaces of the inner member and the outer member For a wheel provided with a double row rolling element accommodated in a rollable manner via a cage, and a seal attached to an opening of an annular space formed by the outer member and the inner member In the bearing device, the inner seal of the seals has a substantially L-shaped cross section. In other words, the annular member is pressed into the outer periphery of the inner ring, and the annular seal plate that is arranged oppositely and that is press-fitted into the inner periphery of the end portion of the outer member and the seal member that is integrally joined to the core member. It is composed of a composite type seal made of slinger, and the seal member has a side lip that is in sliding contact with the slinger, and a backup seal is provided on the outer side of the seal, and this backup seal is connected to the outer member. A cored bar provided with a cylindrical fitting part press-fitted into the outer periphery of the end part, and a disk part extending radially inward from the fitting part along the end surface of the outer member, and the cored bar It consists seal member integrally joined to the base of the seal member has a sliding contact with the seal lip on the outer surface of the slinger extends inclined radially inwardly together, the backup seal sealing member , Is opposed to the sealing member in the sealing plate, tongues projecting axially on one of these base and the sealing member is formed, the tongue is in elastic contact with the other member.

このように、外方部材と内方部材とで形成される環状空間の開口部に装着されたシールを備えた第2または第3世代構造の車輪用軸受装置において、シールのうちインナー側のシールが、断面が略L字状をなして互いに対向配置され、外方部材の端部内周に圧入された芯金と、この芯金に一体に接合されたシール部材とからなる環状のシール板、および内輪の外周に圧入されたスリンガとからなる複合型のシールで構成され、シール部材がスリンガに摺接するサイドリップを有すると共に、当該シールの外方側にバックアップシールが設けられ、このバックアップシールが、外方部材の端部外周に圧入される円筒状の嵌合部と、この嵌合部から外方部材の端面に沿って径方向内方に延びる円板部とを備えた芯金、およびこの芯金に一体に接合されたシール部材からなり、このシール部材が、径方向内方に傾斜して延びてスリンガの外側面に摺接するシールリップを一体に有し、当該バックアップシールのシール部材の基部が、シール板におけるシール部材に対向配置され、これら基部とシール部材の一方に軸方向に突出した舌片が形成され、この舌片が他方の部材に弾性接触しているので、雨水やダスト等がシールに直接侵入するのを防止し、劣悪な環境で使用されても、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。また、バックアップシールのサイドリップを通過した泥水等が外方部材と芯金との間に浸入するのを防止することができ、泥水により外方部材が発錆して嵌合部から泥水が軸受内部に浸入するのを防止することができる。
Thus, in the wheel bearing device having the second or third generation structure provided with the seal attached to the opening of the annular space formed by the outer member and the inner member, the inner seal among the seals is provided. However, an annular seal plate comprising a cored bar that is disposed opposite to each other with a substantially L-shaped cross section and press-fitted into the inner periphery of the end of the outer member, and a seal member that is integrally joined to the cored bar, And a composite seal composed of a slinger press-fitted to the outer periphery of the inner ring, the seal member has a side lip that slidably contacts the slinger, and a backup seal is provided on the outer side of the seal. A mandrel comprising a cylindrical fitting portion press-fitted into the outer periphery of the end portion of the outer member, and a disc portion extending radially inward from the fitting portion along the end surface of the outer member; Bonded integrally to this mandrel Consists seal member, the seal member has a sliding contact with the seal lip on the outer surface of the slinger extends inclined radially inwardly together, the base of the seal member of the backup seal, the seal plate A tongue piece projecting in the axial direction is formed on one of the base and the seal member and is opposed to the seal member, and this tongue piece is in elastic contact with the other member, so that rainwater, dust, etc. directly enter the seal. Thus, even when used in a poor environment, it is possible to provide a wheel bearing device capable of improving the sealing performance of the seal and maintaining the bearing performance for a long period of time. In addition, muddy water that has passed through the side lip of the backup seal can be prevented from entering between the outer member and the cored bar. Intrusion into the interior can be prevented.

また、請求項2に記載の発明のように、前記バックアップシールの芯金が、前記外方部材の端部に密着する円板部と、この円板部からさらに径方向内方に延びる内端部とからなり、この内端部に前記シール部材が接合されていても良い。   According to a second aspect of the present invention, the core of the backup seal has a disc portion that is in close contact with the end portion of the outer member, and an inner end that extends further radially inward from the disc portion. The seal member may be joined to the inner end portion.

また、請求項3に記載の発明のように、前記バックアップシールのシール部材の基部が、前記外方部材の端面に密着するように前記円板部に回り込んで接合されていれば、バックアップシールのサイドリップを通過した泥水等が外方部材と芯金との間に浸入するのを防止することができ、泥水により外方部材が発錆して嵌合部から泥水が軸受内部に浸入するのを防止することができる。
It is preferable as defined in claim 3, the base of the seal member of the backup seal, if it is bonded wraps around the disc portion so as to be in close contact with the end face of the outer member, Ba click up seal It is possible to prevent the muddy water that has passed through the side lip from entering between the outer member and the cored bar, and the muddy water rusts the outer member and the muddy water enters the bearing from the fitting portion. Can be prevented.

また、請求項4に記載の発明のように、前記内方部材が、前記ハブ輪、およびこのハブ輪の小径段部に圧入された一対の内輪からなると共に、前記シールのうちアウター側のシールが前記インナー側のシールで構成され、このシールの外方側に前記バックアップシールが設けられていれば、シールの密封性能が一層向上し、軸受性能を長期間に亘って維持することができる。   According to a fourth aspect of the present invention, the inner member includes the hub ring and a pair of inner rings press-fitted into a small-diameter step portion of the hub ring. However, if the backup seal is provided on the outer side of the seal, the sealing performance of the seal is further improved, and the bearing performance can be maintained for a long period of time.

また、請求項5に記載の発明のように、前記バックアップシールの芯金が、防錆能を有する鋼板からプレス加工にて形成されていれば、長期間に亘って発錆を防止し、安定した密封性を維持することができる。また、請求項6に記載の発明のように、前記バックアップシールのシール部材の基部が、前記スリンガの立板部の外径よりも内径側まで延びていれば、サイドリップを通過した泥水等が外方部材と芯金との間に浸入するのを確実に防止することができる。
Moreover, if the core metal of the said backup seal is formed by the press work from the steel plate which has rust prevention ability like invention of Claim 5, it will prevent rusting over a long period of time and will be stable. Sealing performance can be maintained. Further, as in the invention described in claim 6, if the base part of the seal member of the backup seal extends to the inner diameter side of the outer diameter of the standing plate part of the slinger, muddy water that has passed through the side lip, etc. Intrusion between the outer member and the cored bar can be reliably prevented.

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一体に形成された外方部材と、一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に嵌合された少なくとも一つの内輪からなり、外周に前記複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、この内方部材と前記外方部材の両転走面間に保持器を介して転動自在に収容された複列の転動体と、前記外方部材と内方部材と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た車輪用軸受装置において、前記シールのうちインナー側のシールが、断面が略L字状をなして互いに対向配置され、前記外方部材の端部内周に圧入された芯金と、この芯金に一体に接合されたシール部材とからなる環状のシール板、および前記内輪の外周に圧入されたスリンガとからなる複合型のシールで構成され、前記シール部材が前記スリンガに摺接するサイドリップを有すると共に、当該シールの外方側にバックアップシールが設けられ、このバックアップシールが、前記外方部材の端部外周に圧入される円筒状の嵌合部と、この嵌合部から前記外方部材の端面に沿って径方向内方に延びる円板部とを備えた芯金、およびこの芯金に一体に接合されたシール部材からなり、このシール部材が、径方向内方に傾斜して延びて前記スリンガの外側面に摺接するシールリップを一体に有し、当該バックアップシールのシール部材の基部が、前記シール板におけるシール部材に対向配置され、これら基部とシール部材の一方に軸方向に突出した舌片が形成され、この舌片が他方の部材に弾性接触しているので、雨水やダスト等がシールに直接侵入するのを防止し、劣悪な環境で使用されても、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。また、バックアップシールのサイドリップを通過した泥水等が外方部材と芯金との間に浸入するのを防止することができ、泥水により外方部材が発錆して嵌合部から泥水が軸受内部に浸入するのを防止することができる。 A wheel bearing device according to the present invention has an outer member integrally formed with a vehicle body mounting flange for mounting to a suspension device on the outer periphery, and an outer member formed integrally with a double row outer rolling surface on the inner periphery, and one end It has a wheel mounting flange for mounting the wheel on the part, a hub wheel with a small diameter step formed on the outer periphery, and at least one inner ring fitted to the small diameter step of 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 bearing device comprising: a double row of rolling elements accommodated freely; and a seal attached to an opening of an annular space formed by the outer member and the inner member. The side seals are arranged opposite each other with a substantially L-shaped cross section, A composite type seal composed of a core bar press-fitted into the inner periphery of the end of the member, an annular seal plate composed of a seal member integrally joined to the core metal, and a slinger press-fitted into the outer periphery of the inner ring. The seal member has a side lip that is in sliding contact with the slinger, a backup seal is provided on the outer side of the seal, and the backup seal is pressed into the outer periphery of the end of the outer member. A cored bar having a fitting part, a disk part extending radially inward from the fitting part along the end face of the outer member, and a seal member integrally joined to the cored bar. the sealing member has a sliding contact with the seal lip on the outside surface of the slinger extends inclined radially inwardly together, the base of the seal member of the backup seal, sheet in the sealing plate Is opposed to the seal member, the tongue projecting in the axial direction on one of these base and the sealing member is formed, since the tongue piece is in elastic contact with the other member, rainwater or dusts directly entering the seal Thus, even when used in a poor environment, it is possible to provide a wheel bearing device capable of improving the sealing performance of the seal and maintaining the bearing performance for a long period of time. In addition, muddy water that has passed through the side lip of the backup seal can be prevented from entering between the outer member and the cored bar. Intrusion into the interior can be prevented.

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一体に形成された外方部材と、一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に前記複列の外側転走面の一方に対向する内側転走面と、この内側転走面ら軸方向に延びる小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入され、外周に前記複列の外側転走面の他方に対向する内側転走面が形成された内輪からなる内方部材と、この内方部材と前記外方部材の両転走面間に保持器を介して転動自在に収容された複列の転動体と、前記外方部材と内方部材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た車輪用軸受装置において、前記シールのうちインナー側のシールが、断面が略L字状をなして互いに対向配置され、前記外方部材の端部内周に圧入された芯金と、この芯金に一体に接合されたシール部材とからなる環状のシール板、および前記内輪の外周に圧入されたスリンガとからなる複合型のシールで構成され、前記シール部材が前記スリンガに摺接する一対のサイドリップを有すると共に、当該シールの外方側にバックアップシールが設けられ、このバックアップシールが、前記外方部材の端部外周に圧入される円筒状の嵌合部と、この嵌合部から前記外方部材の端面に沿って径方向内方に延びる円板部とを備えた芯金、およびこの芯金に一体に接合され、径方向内方に傾斜して延びて前記スリンガの外側面に摺接するシールリップを一体に有するシール部材からなり、前記バックアップシールのシール部材の基部が、前記外方部材の端面に密着するように前記円板部に回り込んで接合され、当該基部が前記シール板におけるシール部材に対向配置され、このシール部材に軸方向に突出した舌片が形成されて前記基部に弾性接触している。   An outer member integrally having a vehicle body mounting flange to be attached to the suspension device on the outer periphery, a double row outer rolling surface formed integrally on the inner periphery, and a wheel mounting flange for attaching a wheel to one end And a hub wheel in which an inner rolling surface facing one of the outer rolling surfaces of the double row is formed on the outer periphery, and a small diameter step portion extending in the axial direction from the inner rolling surface, and the hub An inner member comprising an inner ring press-fitted into a small-diameter step portion of the ring and having an inner rolling surface facing the other of the outer row rolling surfaces of the double row on the outer periphery; and the inner member and the outer member A double row rolling element accommodated between the rolling surfaces via a cage, and a seal attached to an opening of an annular space formed by the outer member and the inner member. In the wheel bearing device provided, the inner seal of the seals has a substantially L-shaped cross section. And an annular seal plate composed of a core bar press-fitted into the inner periphery of the end portion of the outer member and a seal member integrally joined to the core bar, and press-fitted into the outer periphery of the inner ring. The seal member has a pair of side lips that are in sliding contact with the slinger, and a backup seal is provided on the outer side of the seal. A cored bar provided with a cylindrical fitting part press-fitted into the outer periphery of the end part of the side member, and a disk part extending radially inward from the fitting part along the end surface of the outer member, and A seal member integrally joined to the mandrel, extending inwardly in the radial direction and having a seal lip integrally slidably contacting the outer surface of the slinger, wherein the base of the seal member of the backup seal is Around the disc portion and joined so as to be in close contact with the end face of the outer member, the base portion is disposed opposite to the seal member in the seal plate, and a tongue piece protruding in the axial direction is formed on the seal member. It is in elastic contact with the base.

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のシール部を示す要部拡大図である。なお、以下の説明では、車両に組み付けた状態で車両の外側寄りとなる側をアウター側(図面左側)、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 a first embodiment of a wheel bearing device according to the present invention, and FIG. 2 is an enlarged view of a main part showing a seal portion 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とからなる。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 the second generation, and comprises a hub wheel 1 and a wheel bearing 2. The wheel bearing 2 includes an outer member 3 and a pair of inner rings 5 and 5 that are fitted through double-row rolling elements (conical 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、外周にこの車輪取付フランジ6から軸方向に延びる円筒状の小径段部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によって所定の軸受予圧が付与された状態でハブ輪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, and a cylindrical small-diameter step portion 1a extending in the axial direction from the wheel mounting flange 6 is formed on the outer periphery. A serration (or spline) 1b for torque transmission is formed on the inner periphery. 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 through a predetermined shimiro, and a predetermined portion is formed by a caulking portion 1c formed by plastically deforming an end portion of the small-diameter step portion 1a radially outward. It is fixed in the axial direction with respect to the hub wheel 1 with the bearing preload applied.

ハブ輪1はS53C等の炭素0.40〜0.80wt%を含む中高炭素鋼で形成され、車輪取付フランジ6のインナー側に円弧状の基部6bが形成されると共に、この基部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 and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and an arcuate base portion 6b is formed on the inner side of the wheel mounting flange 6, and from the base portion 6b to the shoulder portion. The surface hardness is hardened to a range of 58 to 64 HRC by induction hardening over the small diameter step portion 1a through 1d. 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.

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%を含む中高炭素鋼で形成され、少なくとも複列の外側転走面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 integrally has a vehicle body mounting flange 3b to be attached to a knuckle (not shown) on the outer periphery, and has a tapered double row outer rolling surface 3a that opens outward on the inner periphery. 3a is integrally formed. This outer member 3 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and at least the double row outer rolling surfaces 3a and 3a have a surface hardness of 58 to 64 HRC by induction hardening. Hardened to range.

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および転動体4はSUJ2等の高炭素クロム鋼で形成され、ズブ焼入れによって芯部まで58〜64HRCの範囲に硬化処理されている。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で構成されている。   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 and the rolling element 4 are made of high carbon chrome steel such as SUJ2, and are 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 that 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とからなる複合型のシール、所謂ハイ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に加硫接着により一体に接合されたシール部材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形成されている。また、シール部材12はニトリルゴム等の弾性部材からなり、径方向外方に傾斜して延びる一対のサイドリップ12a、12bとラジアルリップ12cを有している。   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 an enlarged view in FIG. 2, the seal 8 is a so-called high pack seal, which is a composite seal composed of an annular seal plate 9 and a slinger 10 having a substantially L-shaped cross section and arranged to face each other. It is composed. 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 joined to the metal core 11 by vulcanization adhesion. The metal core 11 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). Further, the seal member 12 is made of an elastic member such as nitrile rubber and has a pair of side lips 12a and 12b and a radial lip 12c that are inclined and extended radially outward.

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形成され、内輪5の外径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。これによりスリンガ10は防錆能を有し、長期間に亘って発錆を防止することができる。そして、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、ラジアルリップ12cが円筒部10aに摺接している。   On the other hand, the slinger 10 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). The cylindrical portion 10a is press-fitted into the outer diameter of the cylindrical portion 10a, and the upright plate portion 10b extends radially outward from the cylindrical portion 10a. Thereby, the slinger 10 has rust prevention ability and can prevent rusting over a long period of time. The pair of side lips 12a and 12b are in sliding contact with the standing plate portion 10b of the slinger 10, and the radial lip 12c is in sliding contact with the cylindrical portion 10a.

本実施形態では、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カップ状に形成され、外方部材3のアウター側の端部外周に圧入固定される円筒状の嵌合部14aと、この嵌合部14aから径方向内方に延び、外方部材3のアウター側の端部に密着する円板部14bと、この円板部14bからさらに径方向内方に延びる内端部14cとからなる。   In the present embodiment, a backup seal 13 is further 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 is formed in a cup shape 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), A cylindrical fitting portion 14a that is press-fitted and fixed to the outer periphery of the outer side end portion of the outer member 3, and extends radially inward from the fitting portion 14a and is in close contact with the outer side end portion of the outer member 3 The disc part 14b to be formed and the inner end part 14c extending further radially inward from the disc part 14b.

一方、シール部材15は芯金14の内端部14cに加硫接着により一体に接合され、径方向内方に傾斜して延びるサイドリップ15aを有している。このサイドリップ15aは、前記スリンガ10の立板部10bの外側面に摺接し、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。これにより、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。   On the other hand, the seal member 15 is integrally joined to the inner end portion 14c of the metal core 14 by vulcanization adhesion, and has a side lip 15a extending inclining radially inward. The side lip 15a is in sliding contact with the outer surface of the standing plate portion 10b of the slinger 10 to prevent rainwater, dust, and the like from directly entering the seal 8. Thereby, even if it uses in a poor environment, the sealing performance of the seal | sticker 8 can be improved and the wheel bearing apparatus which can maintain bearing performance over a long period of time can be provided.

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、従動輪側であっても良く、また、第3世代構造であっても良い。   In addition, although the 2nd generation structure by the side of a driving wheel was illustrated here, the bearing device for wheels which concerns on this invention may be a driven wheel side not only in this but it is a 3rd generation structure. Also good.

図3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、図4は、図3のシール部を示す要部拡大図、図5は、シール部の不具合状態を示す説明図、図6は、図4のシール部の変形例を示す要部拡大図である。なお、前述した第1の実施形態と同一部品同一部位あるいは同一の機能を有する部品部位には同じ符号を付して詳細な説明を省略する。   FIG. 3 is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention, FIG. 4 is an enlarged view of a main part showing the seal part of FIG. 3, and FIG. FIG. 6 is an enlarged view of an essential part showing a modification of the seal part of FIG. Note that the same parts and 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第3世代と呼称される駆動輪用であって、ハブ輪16と複列の転がり軸受17がユニット化して構成されている。複列の転がり軸受17は、外方部材18と、この外方部材18に複列の転動体(ボール)19、19を介して内嵌された内方部材20とを備えている。内方部材20は、ハブ輪16と、このハブ輪16に固定された内輪21とからなる。   This wheel bearing device is for a drive wheel referred to as a third generation, and includes a hub wheel 16 and a double row rolling bearing 17 as a unit. The double-row rolling bearing 17 includes an outer member 18 and an inner member 20 that is fitted into the outer member 18 via double-row rolling elements (balls) 19 and 19. The inner member 20 includes a hub ring 16 and an inner ring 21 fixed to the hub ring 16.

ハブ輪16は、アウター側の端部に車輪取付フランジ6を一体に有し、外周に円弧状のアウター側の内側転走面16aと、この内側転走面16aから軸方向に延びる円筒状の小径段部16b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。内輪21は、外周にインナー側の円弧状の内側転走面21aが形成され、ハブ輪16の小径段部16bに所定のシメシロを介して圧入されている。   The hub wheel 16 integrally has a wheel mounting flange 6 at an end portion on the outer side, an arcuate outer side inner rolling surface 16a on the outer periphery, and a cylindrical shape extending in the axial direction from the inner rolling surface 16a. A small-diameter step 16b is formed, and a serration (or spline) 1b for torque transmission is formed on the inner periphery. The inner ring 21 has an inner-side arcuate inner rolling surface 21a formed on the outer periphery, and is press-fitted into the small-diameter step portion 16b of the hub wheel 16 via a predetermined shimoshiro.

ハブ輪16はS53C等の炭素0.40〜0.80wt%を含む中高炭素鋼で形成され、内側転走面16aをはじめ、基部6bから小径段部16b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。また内輪21および転動体19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。これにより、ハブ輪16の強度・剛性が高くなり軽量・コンパクト化が図れると共に、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21の嵌合部となる小径段部16bの耐フレッティング性が向上する。   The hub wheel 16 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and has a surface hardness by induction quenching from the inner rolling surface 16a to the small diameter step portion 16b from the base portion 6b. Is cured in the range of 58 to 64 HRC. Further, the inner ring 21 and the rolling element 19 are made of high carbon chrome steel such as SUJ2, and are hardened in the range of 58 to 64 HRC to the core portion by quenching. As a result, the strength and rigidity of the hub wheel 16 can be increased and the weight and size can be reduced, and the hub wheel 16 has sufficient mechanical strength against the rotational bending load applied to the wheel mounting flange 6. The fretting resistance of the small-diameter step portion 16b is improved.

外方部材18は、外周に車体取付フランジ3bを一体に有し、内周に前記内方部材20の複列の内側転走面16a、21aに対向する円弧状の複列の外側転走面18a、18aが一体に形成されている。この外方部材18はS53C等の炭素0.40〜0.80wt%を含む中高炭素鋼で形成され、少なくとも複列の外側転走面18a、18a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 18 integrally has a vehicle body mounting flange 3b on the outer periphery, and has an arcuate double row outer rolling surface facing the double row inner rolling surfaces 16a and 21a of the inner member 20 on the inner periphery. 18a and 18a are integrally formed. This outer member 18 is formed of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and at least double row outer rolling surfaces 18a and 18a have a surface hardness of 58 to 64 HRC by induction hardening. Hardened to range.

外方部材18と内方部材20の両転走面間には複列の転動体19、19が収容され、保持器22、22によって転動自在に保持されている。この複列の転がり軸受17は、ハブ輪16の肩部16cに内輪21の小径(正面)側端面21bが突合せ状態で衝合する、所謂背面合せタイプの複列アンギュラ玉軸受で構成されている。   Double row rolling elements 19 and 19 are accommodated between both rolling surfaces of the outer member 18 and the inner member 20, and are held by the cages 22 and 22 so as to be freely rollable. This double row rolling bearing 17 is constituted by a so-called back-to-back type double row angular contact ball bearing in which the small diameter (front) side end surface 21b of the inner ring 21 abuts with the shoulder portion 16c of the hub wheel 16 in a butted state. .

また、外方部材18と内方部材20との間に形成される環状空間の開口部にはシール23、24が装着されている。これらのシール23、24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。   Further, seals 23 and 24 are attached to an opening portion of an annular space formed between the outer member 18 and the inner member 20. These seals 23 and 24 prevent leakage of grease sealed inside the bearing and intrusion of rainwater and dust from the outside into the bearing.

インナー側のシール24は、図4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26とスリンガ10とからなる複合型のハイパックシールを構成している。シール板26は、外方部材18の端部内周に圧入される芯金11と、この芯金11に加硫接着により一体に接合されたシール部材27とからなる。このシール部材27はニトリルゴム等の弾性部材からなり、芯金11の端部から内径部に回り込んで接合されている。そして、径方向外方に傾斜して延びる一対のサイドリップ12a、12bとラジアルリップ12c、および芯金11の端部に軸方向に突出して形成された舌片27aを一体に有している。   As shown in an enlarged view in FIG. 4, the inner-side seal 24 constitutes a composite high pack seal composed of an annular seal plate 26 and a slinger 10 which are substantially L-shaped in cross section and arranged to face each other. is doing. The seal plate 26 includes a metal core 11 that is press-fitted into the inner periphery of the end of the outer member 18, and a seal member 27 that is integrally joined to the metal core 11 by vulcanization adhesion. The seal member 27 is made of an elastic member such as nitrile rubber, and is joined from the end portion of the cored bar 11 to the inner diameter portion. A pair of side lips 12a, 12b and a radial lip 12c extending in a radially outward direction and a tongue piece 27a formed so as to protrude in the axial direction at the end of the core metal 11 are integrally provided.

本実施形態では、さらに外方部材18のインナー側の端部外周にバックアップシール28が圧入されている。このバックアップシール28は、芯金29と、この芯金29に一体に加硫接着されたシール部材30とからなる。芯金29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L字状に形成され、外方部材18の端部外周に圧入固定される円筒状の嵌合部29aと、この嵌合部29aから外方部材18の端面に沿って径方向内方に延びる円板部29bとからなる。   In this embodiment, a backup seal 28 is press-fitted to the outer periphery of the inner side end of the outer member 18. The backup seal 28 includes a core metal 29 and a seal member 30 that is integrally vulcanized and bonded to the core metal 29. The core metal 29 is formed into an L-shaped cross section by press working from an austenitic stainless steel plate (JIS standard SUS304, etc.) or a rust-proof cold rolled steel plate (JIS standard SPCC, etc.). A cylindrical fitting portion 29a that is press-fitted and fixed to the outer periphery of the end portion of the outer member 18, and a disc portion 29b that extends radially inward from the fitting portion 29a along the end surface of the outer member 18. Consists of.

一方、シール部材30はニトリルゴム等の弾性部材からなり、芯金29の円板部29bに加硫接着により一体に接合されている。このシール部材30は、外方部材18の端面に密着するように、芯金19の円板部29bに回り込んで接合された基部30aと、この基部30aから径方向内方に傾斜して延びるサイドリップ30bを有している。このサイドリップ30bは、前記スリンガ10の立板部10bの外側面に摺接し、泥水等が前記シール24に直接浸入するのを防止している。また、前記シール板26におけるシール部材27の舌片27aは、バックアップシール28におけるシール部材30の基部30aに弾性接触し、サイドリップ30bを通過した泥水等が外方部材18と芯金29との間に浸入するのを防止している。   On the other hand, the seal member 30 is made of an elastic member such as nitrile rubber, and is integrally joined to the disc portion 29b of the core metal 29 by vulcanization adhesion. The seal member 30 extends so as to incline radially inward from the base portion 30a and the base portion 30a which are joined by being wrapped around the disc portion 29b of the core metal 19 so as to be in close contact with the end face of the outer member 18. It has a side lip 30b. The side lip 30b is in sliding contact with the outer surface of the standing plate portion 10b of the slinger 10 to prevent muddy water or the like from directly entering the seal 24. Further, the tongue piece 27 a of the seal member 27 in the seal plate 26 is in elastic contact with the base portion 30 a of the seal member 30 in the backup seal 28, and muddy water or the like that has passed through the side lip 30 b is formed between the outer member 18 and the core metal 29. Preventing intrusion in between.

すなわち、前述した第1の実施形態におけるバックアップシール13では、図5に示すように、サイドリップ15aを通過した泥水等が外方部材3と芯金14との間に浸入した場合、泥水により外方部材3が発錆し、この錆が促進されて嵌合部から泥水が軸受内部に浸入する恐れがある。本実施形態では、こうした構成のバックアップシール18を採用することにより、劣悪な環境で使用されても、シール24の密封性能のさらなる向上を図り、軸受性能を長期間に亘って維持することができる。   That is, in the backup seal 13 in the first embodiment described above, when muddy water or the like that has passed through the side lip 15a enters between the outer member 3 and the core metal 14 as shown in FIG. The direction member 3 is rusted, and this rust is promoted, so that muddy water may enter the bearing from the fitting portion. In the present embodiment, by employing the backup seal 18 having such a configuration, the sealing performance of the seal 24 can be further improved and the bearing performance can be maintained over a long period of time even when used in a poor environment. .

図6は、図4のシール24とバックアップシール28の構成が一部異なる変形例を示している。本実施形態では、外方部材18のインナー側の端部に装着されたシール8にバックアップ31が付加されている。このバックアップシール31は、芯金29と、この芯金29に一体に加硫接着されたシール部材32とからなる。シール部材32は、芯金29の円板部29bに加硫接着により一体に接合され、外方部材18の端面に密着するように芯金29の円板部29bに回り込んで接合された基部32aと、この基部32aから径方向内方に傾斜して延びるサイドリップ30bを有している。また、基部32aには前記シール板9におけるシール部材12に弾性接触する舌片33aが突設されている。これにより、サイドリップ30bを通過した泥水等が外方部材18と芯金29との間に浸入するのを防止し、バックアップシール31の気密性が高くなってシール8の密封性をさらに向上させることができる。   FIG. 6 shows a modification in which the configurations of the seal 24 and the backup seal 28 in FIG. 4 are partially different. In this embodiment, a backup 31 is added to the seal 8 attached to the inner side end of the outer member 18. The backup seal 31 includes a metal core 29 and a seal member 32 that is integrally vulcanized and bonded to the metal core 29. The sealing member 32 is integrally joined to the disc portion 29b of the core metal 29 by vulcanization adhesion, and a base portion that is joined around the disc portion 29b of the core metal 29 so as to be in close contact with the end surface of the outer member 18. 32a, and a side lip 30b extending obliquely inward in the radial direction from the base portion 32a. In addition, a tongue piece 33a that elastically contacts the seal member 12 of the seal plate 9 is projected from the base portion 32a. As a result, muddy water or the like that has passed through the side lip 30b is prevented from entering between the outer member 18 and the core metal 29, and the airtightness of the backup seal 31 is increased and the sealing performance of the seal 8 is further improved. be able to.

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、軸受端部にシールが装着された第2または第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 second or third generation structure in which a seal is mounted on a bearing end portion, regardless of whether the wheel is used for a driving wheel or a driven wheel.

本発明に係る車輪用軸受装置の第1の実施形態を示す縦断面図である。It is a longitudinal section showing a 1st embodiment of a bearing device for wheels concerning the present invention. 図1のインナー側のシール部を示す要部拡大図である。It is a principal part enlarged view which shows the seal part of the inner side of FIG. 本発明に係る車輪用軸受装置の第2の実施形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. 図3のインナー側のシール部を示す要部拡大図である。It is a principal part enlarged view which shows the seal part of the inner side of FIG. 図2のシール部の不具合状態を示す説明図である。It is explanatory drawing which shows the malfunction state of the seal | sticker part of FIG. 図4のシールの変形例を示す要部拡大図である。It is a principal part enlarged view which shows the modification of the seal | sticker of FIG. 従来の車輪用軸受装置におけるシールを示す要部拡大図である。It is a principal part enlarged view which shows the seal | sticker in the conventional wheel bearing apparatus.

符号の説明Explanation of symbols

1、16・・・・・・・・・・・・ハブ輪
1a、16b・・・・・・・・・・小径段部
1b・・・・・・・・・・・・・・セレーション
1c・・・・・・・・・・・・・・加締部
1d、16c・・・・・・・・・・肩部
2・・・・・・・・・・・・・・・車輪用軸受
3、18・・・・・・・・・・・・外方部材
3a、18a・・・・・・・・・・外側転走面
3b・・・・・・・・・・・・・・車体取付フランジ
4、19・・・・・・・・・・・・転動体
5、21・・・・・・・・・・・・内輪
5a、16a、21a・・・・・・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、30a、32a・・・・・・基部
7、22・・・・・・・・・・・・保持器
8、23、24・・・・・・・・・シール
9、26・・・・・・・・・・・・シール板
10・・・・・・・・・・・・・・スリンガ
10a・・・・・・・・・・・・・円筒部
10b・・・・・・・・・・・・・立板部
11、14、29・・・・・・・・芯金
12、15、27、30、32・・シール部材
12a、12b、15a、30b・サイドリップ
12c・・・・・・・・・・・・・ラジアルリップ
13、28、31・・・・・・・・バックアップシール
14a・・・・・・・・・・・・・嵌合部
14b・・・・・・・・・・・・・円板部
14c・・・・・・・・・・・・・内端部
17・・・・・・・・・・・・・・複列の転がり軸受
20・・・・・・・・・・・・・・内方部材
21b・・・・・・・・・・・・・小径側端面
27a、33・・・・・・・・・・舌片
50・・・・・・・・・・・・・・シール
51・・・・・・・・・・・・・・内周側部材
52・・・・・・・・・・・・・・外周側部材
53・・・・・・・・・・・・・・シール板
53a、55a・・・・・・・・・円筒部
53b、55b・・・・・・・・・立板部
53c・・・・・・・・・・・・・傾斜板部
54・・・・・・・・・・・・・・密封要素
55・・・・・・・・・・・・・・基板
55c・・・・・・・・・・・・・傾斜片部
56・・・・・・・・・・・・・・弾性体
56a・・・・・・・・・・・・・第1のサイドリップ
56b・・・・・・・・・・・・・第2のサイドリップ
56c・・・・・・・・・・・・・ラジアルリップ
S・・・・・・・・・・・・・・・空間
1, 16 ··········································································· Serration 1c ····························································· For wheels Bearings 3, 18, ... Outer members 3a, 18a ... Outer rolling surface 3b ... · Body mounting flanges 4, 19 ·········· Rolling elements 5, 21 ·········· Inner rings 5a, 16a, 21a ··· Inward rolling Running surface 5b ············································································ ..Wheel mounting flange 6a ... hub bolts 6b, 30a, 32a ... Base 7, 22, ... Retainer 8, 23, 24 ... Seal 9, 26 ... ... Seal plate 10 ... Slinger 10a ... Cylindrical part 10b ...・ Standing plate parts 11, 14, 29... Core bars 12, 15, 27, 30, 32 .. Seal members 12a, 12b, 15a, 30b. Side lip 12c.・ ・ ・ ・ Radial lip 13, 28, 31 ・ ・ ・ ・ ・ ・ Backup seal 14a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fitting part 14b ・ ・ ・ ・ ・ ・· · · Disk portion 14c · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · .... Inward part 21b ········· Small end surface 27a, 33 ·····················································・ ・ ・ ・ ・ ・ ・ ・ Inner peripheral side member 52 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer peripheral member 53 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Seal plates 53a, 55a,... Cylindrical portions 53b, 55b,... Standing plate portions 53c,. ············· Sealing element 55 ···························· ... Elastic body 56a ... First side lip 56b ... Second Side lip 56c ... Radial lip S ... ···········space

Claims (6)

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一体に形成された外方部材と、
一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に嵌合された少なくとも一つの内輪からなり、外周に前記複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、
この内方部材と前記外方部材の両転走面間に保持器を介して転動自在に収容された複列の転動体と、
前記外方部材と内方部材と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た車輪用軸受装置において、
前記シールのうちインナー側のシールが、断面が略L字状をなして互いに対向配置され、前記外方部材の端部内周に圧入された芯金と、この芯金に一体に接合されたシール部材とからなる環状のシール板、および前記内輪の外周に圧入されたスリンガとからなる複合型のシールで構成され、前記シール部材が前記スリンガに摺接するサイドリップを有すると共に、当該シールの外方側にバックアップシールが設けられ、このバックアップシールが、前記外方部材の端部外周に圧入される円筒状の嵌合部と、この嵌合部から前記外方部材の端面に沿って径方向内方に延びる円板部とを備えた芯金、およびこの芯金に一体に接合されたシール部材からなり、このシール部材が、径方向内方に傾斜して延びて前記スリンガの外側面に摺接するシールリップを一体に有し、当該バックアップシールのシール部材の基部が、前記シール板におけるシール部材に対向配置され、これら基部とシール部材の一方に軸方向に突出した舌片が形成され、この舌片が他方の部材に弾性接触し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 an outer rolling surface of a double row integrally formed on the inner periphery;
Consists of a hub ring integrally having a wheel mounting flange for mounting a wheel at one end, a small-diameter step portion formed on the outer periphery, and at least one inner ring fitted to the small-diameter step portion of the hub ring. An inner member formed with a double-row inner rolling surface facing the double-row outer rolling surface,
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 a seal attached to an opening of the annular space formed by the outer member and the inner member,
Among the seals, the inner side seals are arranged to face each other with a substantially L-shaped cross section, and the core metal press-fitted into the inner periphery of the end of the outer member, and the seal integrally joined to the core metal The seal member is composed of an annular seal plate made of a member and a composite type seal made of a slinger press-fitted to the outer periphery of the inner ring, and the seal member has a side lip that slidably contacts the slinger, and the outside of the seal A backup seal is provided on the side, and the backup seal is a cylindrical fitting portion that is press-fitted into the outer periphery of the end portion of the outer member, and a radially inner portion along the end surface of the outer member from the fitting portion. And a seal member integrally joined to the core, and the seal member extends inward in the radial direction and slides on the outer surface of the slinger. Seal Has-up together, the base of the seal member of the backup seal, the disposed opposite to the seal member of the seal plate, tongues projecting axially on one of these base and the sealing member is formed, the tongue A bearing device for a wheel, wherein the piece is in elastic contact with the other member .
前記バックアップシールの芯金が、前記外方部材の端部に密着する円板部と、この円板部からさらに径方向内方に延びる内端部とからなり、この内端部に前記シール部材が接合されている請求項1に記載の車輪用軸受装置。   The core of the backup seal is composed of a disc portion that is in close contact with the end portion of the outer member, and an inner end portion that extends further radially inward from the disc portion, and the seal member is disposed on the inner end portion. The wheel bearing device according to claim 1, wherein: 前記バックアップシールのシール部材の基部が、前記外方部材の端面に密着するように前記円板部に回り込んで接合されている請求項1に記載の車輪用軸受装置。 It said backup base of the seal of the sealing member is a wheel bearing apparatus of claim 1, which is bonded wraps around the disc portion so as to be in close contact with the end face of the outer member. 前記内方部材が、前記ハブ輪、およびこのハブ輪の小径段部に圧入された一対の内輪からなると共に、前記シールのうちアウター側のシールが前記インナー側のシールで構成され、このシールの外方側に前記バックアップシールが設けられている請求項1乃至3いずれかに記載の車輪用軸受装置。   The inner member includes the hub ring and a pair of inner rings press-fitted into a small-diameter step portion of the hub ring, and an outer seal of the seals is configured by the inner seal. The wheel bearing device according to claim 1, wherein the backup seal is provided on an outer side. 前記バックアップシールの芯金が、防錆能を有する鋼板からプレス加工にて形成されている請求項1乃至4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 4, wherein the core metal of the backup seal is formed by press working from a steel plate having antirust performance. 前記バックアップシールのシール部材の基部が、前記スリンガの立板部の外径よりも内径側まで延びている請求項1乃至5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 5, wherein a base portion of the seal member of the backup seal extends to an inner diameter side with respect to an outer diameter of the standing plate portion of the slinger.
JP2007014578A 2007-01-25 2007-01-25 Wheel bearing device Expired - Fee Related JP4812112B2 (en)

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US20150377299A1 (en) * 2012-10-19 2015-12-31 Aktiebolaget Skf Rolling bearing with sealing subassembly
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KR20200094024A (en) * 2019-01-29 2020-08-06 주식회사 일진글로벌 Wheel bearing for vehicle having improved sealing function

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JP2004211822A (en) * 2003-01-06 2004-07-29 Nsk Ltd Sealing device, rolling bearing incorporating the same, and hub unit
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