JP2014169724A - Rolling bearing unit for supporting wheel with seal ring - Google Patents

Rolling bearing unit for supporting wheel with seal ring Download PDF

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Publication number
JP2014169724A
JP2014169724A JP2013040714A JP2013040714A JP2014169724A JP 2014169724 A JP2014169724 A JP 2014169724A JP 2013040714 A JP2013040714 A JP 2013040714A JP 2013040714 A JP2013040714 A JP 2013040714A JP 2014169724 A JP2014169724 A JP 2014169724A
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Prior art keywords
seal
ring
outer ring
hub
peripheral surface
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JP2013040714A
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JP6048221B2 (en
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Yasuhiro Maeda
康博 前田
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NSK Ltd
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NSK Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/80—Labyrinth sealings
    • F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips
    • 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
    • F16C33/7873—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 single sealing ring of generally L-shaped cross-section
    • F16C33/7876—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 single sealing ring of generally L-shaped cross-section with sealing lips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/186—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
  • Sealing Of Bearings (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

PROBLEM TO BE SOLVED: To obtain a structure which is not deformed due to the absorption of a water component by a labyrinth lip 24a of a seal ring 14b arranged in a position in which the ring is liable to contact with the water component between external spaces even if the structure is employed which can make a current flow between an outer ring 2 and a hub 3 via the seal ring 14b for blocking an external end opening of a rolling body arrangement space 15.SOLUTION: A seal material 18a of a seal ring 14b is constituted of a first seal part 32 which is formed of an insulating elastic material and a second seal part 33 which is formed of a conductive elastic material. A labyrinth lip 24a is formed at the first seal part 32. Furthermore, an outer-ring contacting seal part 36 of the second seal part 33 is made to contact with the outer ring 2, and seal lips 35a, 35b and 35c are made to contact with a hub 3.

Description

この発明は、自動車の車輪を懸架装置に支持する為のシールリング付車輪支持用転がり軸受ユニットの改良に関する。   The present invention relates to an improvement of a wheel bearing rolling bearing unit with a seal ring for supporting a vehicle wheel on a suspension device.

自動車の車輪は、例えば図７に示す様な、シールリング付車輪支持用転がり軸受ユニット１により、懸架装置に対し回転自在に支持する。このシールリング付車輪支持用転がり軸受ユニット１は、外輪２の内径側にハブ３を、複数個の転動体４、４を介して回転自在に支持して成る。このうちの外輪２は、外周面に懸架装置に支持固定する為の静止側フランジ５を、内周面に複列の外輪軌道６、６を、それぞれ設けている。又、前記ハブ３は、ハブ本体７と内輪８とをナット９により組み合わせ固定したもので、外周面に複列の内輪軌道１０、１０を有する。又、前記各転動体４、４は、これら両内輪軌道１０、１０と前記両外輪軌道６、６との間に、両列毎に複数個ずつ、それぞれ保持器１１、１１により保持された状態で転動自在に設けられている。   The wheels of the automobile are rotatably supported with respect to the suspension device by a wheel bearing rolling bearing unit 1 with a seal ring as shown in FIG. 7, for example. The wheel bearing rolling bearing unit 1 with a seal ring is configured such that a hub 3 is rotatably supported via a plurality of rolling elements 4 and 4 on the inner diameter side of an outer ring 2. Of these, the outer ring 2 is provided with a stationary-side flange 5 on the outer peripheral surface for supporting and fixing to the suspension device, and double row outer ring raceways 6 and 6 on the inner peripheral surface. The hub 3 has a hub body 7 and an inner ring 8 combined and fixed by nuts 9 and has double-row inner ring raceways 10 and 10 on the outer peripheral surface. The rolling elements 4 and 4 are held by the cages 11 and 11 between the inner ring raceways 10 and 10 and the outer ring raceways 6 and 6, respectively. It is provided so that it can roll freely.

又、前記ハブ本体７の外端寄り部分で、前記外輪２の外端開口部から突出した部分には、特許請求の範囲に記載したフランジに相当する、回転側フランジ１２を設けている。この回転側フランジ１２には複数本のスタッド１３の基端部を支持固定しており、これら各スタッド１３によりこの回転側フランジ１２に、車輪を構成するホイールを支持固定できる様にしている。   Further, a rotation side flange 12 corresponding to the flange described in the claims is provided at a portion of the hub body 7 that is close to the outer end and protrudes from the outer end opening of the outer ring 2. A base end portion of a plurality of studs 13 is supported and fixed to the rotation side flange 12, and the wheels constituting the wheel can be supported and fixed to the rotation side flange 12 by the studs 13.

又、前記外輪２の外端部内周面と前記ハブ３の中間部外周面との間にシールリング１４を装着して、これら外輪２の内周面とハブ３の外周面との間に存在し、前記各転動体４、４を設けた転動体配置空間１５の外端開口部を塞いでいる。又、前記外輪２の内端開口部をカバー１６で塞ぐ事により、この内端開口部から前記転動体配置空間１５内への塵芥や雨水等の異物の侵入防止、及び、この転動体配置空間１５内に充填したグリースの外部への漏洩防止を図っている。尚、軸方向に関して内とは、車両への組み付け状態で幅方向中央側で各図の右側を言い、同じく外とは、幅方向外側で各図の左側を言う。   Further, a seal ring 14 is mounted between the outer peripheral surface of the outer end of the outer ring 2 and the outer peripheral surface of the intermediate portion of the hub 3, and exists between the inner peripheral surface of the outer ring 2 and the outer peripheral surface of the hub 3. The outer end opening of the rolling element arrangement space 15 provided with the rolling elements 4 and 4 is closed. Further, by covering the inner end opening of the outer ring 2 with a cover 16, foreign matter such as dust and rain water can be prevented from entering the rolling element arrangement space 15 from the inner end opening, and the rolling element arrangement space can be obtained. The grease filled in 15 is prevented from leaking to the outside. Note that “inner” in the axial direction means the right side of each figure at the center in the width direction in the assembled state in the vehicle, and “outer” means the left side of each figure outside in the width direction.

又、図示の例では、前記各転動体４、４として玉を使用しているが、重量の嵩む自動車に組み込む、シールリング付車輪支持用転がり軸受ユニットの場合には、各転動体として円すいころを使用する場合もある。又、ハブ本体と内輪とを結合固定する為に、図示の様にハブ本体７の内端部にナット９を螺合固定する構造に代えて、ハブ本体の内端部を径方向外方に塑性変形させて形成したかしめ部により、このハブ本体に外嵌した内輪の内端面を抑え付ける事もできる。更に、図示の例は、従動輪（ＦＲ車、ＲＲ車、ＭＲ車の前輪、ＦＦ車の後輪）用のシールリング付車輪支持用転がり軸受ユニットである為、ハブ本体７が充実体であるが、駆動輪（ＦＲ車、ＲＲ車、ＭＲ車の後輪、ＦＦ車の前輪、４ＷＤ車の全輪）用のシールリング付車輪支持用転がり軸受ユニットの場合には、ハブ本体の中心部にスプライン孔を、このハブ本体を軸方向に貫通する状態で設ける。   In the illustrated example, balls are used as the rolling elements 4 and 4. However, in the case of a rolling bearing unit for supporting a wheel with a seal ring incorporated in a heavy automobile, a tapered roller is used as each rolling element. May be used. Further, in order to connect and fix the hub body and the inner ring, the inner end portion of the hub body is radially outward instead of the structure in which the nut 9 is screwed and fixed to the inner end portion of the hub body 7 as shown in the figure. The inner end surface of the inner ring that is externally fitted to the hub body can be suppressed by a caulking portion formed by plastic deformation. Furthermore, since the illustrated example is a wheel bearing rolling bearing unit with a seal ring for driven wheels (FR wheel, RR vehicle, front wheel of MR vehicle, rear wheel of FF vehicle), the hub body 7 is a solid body. In the case of a rolling bearing unit for supporting wheels with a seal ring for driving wheels (FR wheel, RR vehicle, rear wheel of MR vehicle, front wheel of FF vehicle, all wheels of 4WD vehicle) A spline hole is provided so as to penetrate the hub body in the axial direction.

何れの構造の場合も、各転動体を設置した転動体配置空間の外端開口部のシールに関しては、外輪の外端部内周面とハブ本体の中間部外周面との間に設けたシールリング１４により図る。これに対して、前記転動体配置空間の内端開口部のシールに関しては、従動輪用の場合には、図示の様なカバー１６、或いは、外輪の内端部内周面と内輪の内端部外周面との間に設置した組み合わせシールリングにより、駆動輪用の場合には、組み合わせシールリングにより、それぞれ図る。   Regardless of the structure, the seal ring provided between the inner peripheral surface of the outer end of the outer ring and the outer peripheral surface of the intermediate portion of the hub body is used to seal the outer end opening of the rolling element arrangement space where each rolling element is installed. 14 On the other hand, regarding the seal of the inner end opening of the rolling element arrangement space, in the case of a driven wheel, the cover 16 as shown, or the inner peripheral surface of the inner end of the outer ring and the inner end of the inner ring In the case of a drive wheel, a combination seal ring is provided between the outer peripheral surface and the combination seal ring.

前記転動体配置空間１５内への異物侵入防止と、この転動体配置空間１５内に充填したグリースの漏洩防止とを十分に図る為には、この転動体配置空間１５の両端開口部を十分にシールする必要がある。特に、この転動体配置空間１５の外端開口部をシールする為のシールリングに就いては、回転側フランジ１２の軸方向内側面に沿って径方向内方に導かれた異物が前記転動体配置空間１５内に入り込むのを防止する為に、優れたシール性能を要求される。しかも、この転動体配置空間１５の外端開口部に関しては、図７に示す様な、カバー１６によるシールは行えない。   In order to sufficiently prevent foreign matter from entering the rolling element arrangement space 15 and to prevent leakage of grease filled in the rolling element arrangement space 15, the openings at both ends of the rolling element arrangement space 15 are sufficiently provided. Need to seal. In particular, with regard to the seal ring for sealing the outer end opening of the rolling element arrangement space 15, the foreign matter guided radially inward along the axial inner surface of the rotating flange 12 is the rolling element. In order to prevent entry into the arrangement space 15, excellent sealing performance is required. In addition, the outer end opening of the rolling element arrangement space 15 cannot be sealed with the cover 16 as shown in FIG.

この様な事情に鑑みて従来から、前記転動体配置空間１５の外端開口部をシールする為のシールリングとして、各種構造のものが考えられている。図８は、特許文献１に記載されたシールリング１４ａを示している。このシールリング１４ａは、それぞれが円輪状に形成された芯金１７とシール材１８とから構成している。このうちの芯金１７は、軟鋼板等の金属板を曲げ形成して成るもので、嵌合筒部１９と、この嵌合筒部１９の軸方向外端縁から径方向外方に折れ曲がった円輪部２０と、この嵌合筒部１９の軸方向内端縁から径方向内方及び軸方向外方に向けてＵ字形に折り返された折れ曲がり部２１と、前記円輪部２０の外周縁から軸方向内方に折れ曲がった円筒部２２とを備える、そして、このうちの嵌合筒部１９を、外輪２の外端部内周面に締り嵌めで内嵌固定すると共に、前記円輪部２０の内側面を、この外輪２の外端面に、前記シール材１８の一部を介在させた状態で突き当てている。   In view of such circumstances, conventionally, various types of seal rings have been considered as seal rings for sealing the outer end opening of the rolling element arrangement space 15. FIG. 8 shows a seal ring 14a described in Patent Document 1. This seal ring 14a is comprised from the metal core 17 and the sealing material 18 which were each formed in the shape of a ring. The cored bar 17 is formed by bending a metal plate such as a mild steel plate, and is bent radially outward from the fitting cylinder part 19 and the axially outer end edge of the fitting cylinder part 19. An annular portion 20, a bent portion 21 that is folded back in the radial direction and axially outward from the axial inner end edge of the fitting tube portion 19, and the outer peripheral edge of the annular portion 20 And the cylindrical portion 22 bent inward in the axial direction from the inner ring. The fitting cylinder portion 19 is fixed to the inner peripheral surface of the outer end portion of the outer ring 2 by an interference fit, and the annular portion 20 is fixed. The inner surface is abutted against the outer end surface of the outer ring 2 with a part of the sealing material 18 interposed therebetween.

又、前記シール材１８は、ゴムの如きエラストマー等の弾性材製で、前記芯金１７に接合固定しており、３本の接触式のシールリップ２３ａ、２３ｂ、２３ｃと、非接触式のラビリンスシールを構成する、庇状のラビリンスリップ２４とを備える。このうちの各シールリップ２３ａ、２３ｂ、２３ｃは、それぞれの先端縁を回転側フランジ１２の軸方向内側面或いはハブ３の中間部外周面に、全周に亙り摺接させている。   The sealing material 18 is made of an elastic material such as an elastomer such as rubber, and is fixedly bonded to the cored bar 17. Three contact-type seal lips 23 a, 23 b, and 23 c and a non-contact type labyrinth are provided. And a bowl-shaped labyrinth slip 24 constituting a seal. Each of the seal lips 23 a, 23 b, and 23 c is slidably contacted with the entire inner periphery of the tip end edge of the seal lip 23 a, 23 b, and 23 c on the inner surface in the axial direction of the rotary flange 12 or the outer peripheral surface of the intermediate portion of the hub 3.

又、前記ラビリンスリップ２４の外周面は円筒面状としており、その外径寸法を、前記外輪２の外端部外周面の外径寸法よりも、十分に大きくしている。この様なラビリンスリップ２４の先端部の位置を、回転側フランジ１２の軸方向内側面のうちで基端寄り部分（根元部分）に設けられた厚肉部２５と、同じく先端寄り部分に設けられ、この厚肉部２５よりも肉厚の小さい薄肉部２６とを連続する、段部２７との関係で規制している。即ち、前記ラビリンスリップ２４（の先端部乃至基端部）を、前記段部２７よりも径方向外方に位置させると共に、このラビリンスリップ２４の先半部と段部２７とを径方向に重畳させている。これにより、このラビリンスリップ２４の先端縁と前記回転側フランジ１２の軸方向内側面との間に、径方向のラビリンスシール２８ａを形成すると共に、この径方向のラビリンスシール２８ａに連続する状態で、前記ラビリンスリップ２４の先端部内周面と前記段部２７の外周面との間に、軸方向のラビリンスシール２８ｂを形成している。この為、ラビリンスシールの全長を十分に長くできて、前記ラビリンスリップ２４によるラビリンス効果を良好にできる。尚、図７、並びに、後述する図１〜６には、各シールリップの自由状態での形状を示している。   The outer peripheral surface of the labyrinth slip 24 has a cylindrical surface, and the outer diameter is sufficiently larger than the outer diameter of the outer peripheral surface of the outer end portion of the outer ring 2. The position of the tip of the labyrinth slip 24 is provided on the thick portion 25 provided on the proximal end portion (root portion) of the axially inner side surface of the rotation side flange 12 and also on the tip portion. The thin portion 26 having a smaller thickness than the thick portion 25 is constrained by the relationship with the stepped portion 27. That is, the labyrin slip 24 (the front end portion or the base end portion thereof) is positioned radially outward from the step portion 27, and the leading half and the step portion 27 of the labyrin slip 24 are overlapped in the radial direction. I am letting. As a result, a radial labyrinth seal 28a is formed between the leading edge of the labyrinth slip 24 and the axially inner side surface of the rotating side flange 12, and in a state continuous with the radial labyrinth seal 28a, An axial labyrinth seal 28 b is formed between the inner peripheral surface of the tip of the labyrinth slip 24 and the outer peripheral surface of the stepped portion 27. For this reason, the full length of the labyrinth seal can be made sufficiently long, and the labyrinth effect by the labyrinth slip 24 can be improved. 7 and FIGS. 1 to 6 described later show the shapes of the seal lips in a free state.

更に、本例の場合には、前記シールリング１４ａを構成するシール材１８により、庇部２９及び止水部３０を設けている。このうちの庇部２９は、前記円筒部２２を覆う状態で設けられている。又、前記止水部３０は、この庇部２９の内周面の軸方向外端に連続しており、前記円輪部２０の径方向外端寄りから径方向内端に掛けての部分を覆う状態で設けられている。
又、前記庇部２９の内径寸法は、前記外輪２の外周面の軸方向外端部の外径寸法よりも大きくして、この庇部２９の内周面とこの外輪２の外周面の軸方向外端部との間に環状隙間３１を、全周に亙り設けている。言い換えれば、この外輪２の外周面の軸方向外端部の全周に亙って、この外輪２の外周面の軸方向外端部と前記庇部２９と前記止水部３０とにより三方を囲まれて、軸方向内方が開口した、凹溝を形成している。 Furthermore, in the case of this example, the collar part 29 and the water stop part 30 are provided by the sealing material 18 which comprises the said seal ring 14a. Of these, the flange portion 29 is provided so as to cover the cylindrical portion 22. In addition, the water stop portion 30 is continuous with the axially outer end of the inner peripheral surface of the flange portion 29, and a portion of the annular portion 20 that is hung from the radially outer end toward the radially inner end is provided. It is provided in a covered state.
Further, the inner diameter dimension of the flange portion 29 is made larger than the outer diameter dimension of the outer peripheral surface in the axial direction of the outer peripheral surface of the outer ring 2, and the shaft of the inner peripheral surface of the flange portion 29 and the outer peripheral surface of the outer ring 2 is increased. An annular gap 31 is provided around the entire circumference between the outer end portion in the direction. In other words, over the entire circumference of the outer peripheral surface of the outer ring 2 in the axial direction, the three outer sides of the outer peripheral surface of the outer ring 2, the flange portion 29, and the water stop portion 30. A groove is formed so as to be surrounded and open in the axial direction.

ところで、前述の様な車輪支持用転がり軸受ユニット１を組み込んだ車両の運転状態に於いて、車両に発生する静電気が、この車輪支持用転がり軸受ユニット１に流れ込む事がある。又、この車輪支持用転がり軸受ユニット１を構成する前記各転動体４、４の転動面と前記内輪、外輪両軌道１０、６との間部分には、絶縁性の高い潤滑油膜｛ＥＨＬ（弾性流体潤滑）油膜｝が存在する。この為、この間部分の電気抵抗が大きくなり帯電して（外輪２とハブ３との間に電位差が生じて）、この帯電量が多く（外輪２とハブ３との間の電位差が大きく）なると、前記各転動体４、４の転動面と前記内輪、外輪両軌道１０、６との間に瞬間的に放電現象が発生する（スパークが発生する）。この様なスパークが発生すると、ラジオに雑音が混じる他、著しい場合には、車載の電子機器を誤作動させる可能性がある。尚、上述の様な帯電は、駆動軸による放電がない従動輪用の車輪支持用転がり軸受ユニットに発生し易い傾向にある。   Incidentally, static electricity generated in the vehicle may flow into the wheel-supporting rolling bearing unit 1 in the operating state of the vehicle incorporating the wheel-supporting rolling bearing unit 1 as described above. Further, a highly insulating lubricating oil film {EHL () is formed between the rolling surfaces of the rolling elements 4 and 4 constituting the wheel bearing rolling bearing unit 1 and the inner ring and outer ring raceways 10 and 6. Elastic fluid lubrication) oil film} exists. For this reason, when the electric resistance of the portion in between is increased and charged (a potential difference is generated between the outer ring 2 and the hub 3), and this charge amount is increased (the potential difference between the outer ring 2 and the hub 3 is increased). A discharge phenomenon occurs instantaneously between the rolling surfaces of the rolling elements 4 and 4 and the inner and outer races 10 and 6 (sparking occurs). When such a spark is generated, noise is mixed in the radio, and in a serious case, there is a possibility that an in-vehicle electronic device may malfunction. It should be noted that the above-described electrification tends to occur in a wheel bearing rolling bearing unit for a driven wheel that is not discharged by the drive shaft.

そこで、前記シールリング１４ａを構成するシール材１８を、ゴム材に導電性付与剤を添加した導電性ゴム材で造り、前記シールリング１４ａ（前記芯金１７及び前記シール材１８）を介して、前記外輪２と前記ハブ３との間に電流を流す事により、上述の様なスパークに起因する雑音や誤作動の発生を防止する事が従来から知られている。但し、前記導電性付与剤等の影響で、前記シールリング１４ａを構成する前記シール材１８の吸水性が高くなる場合がある。この為、前述の車輪支持用転がり軸受ユニット１の様に、前記シールリング１４ａを構成するラビリンスリップ２４が、泥水等に接触し易い位置に設けられていると、このラビリンスリップ２４が水分を吸収（膨潤）して、このラビリンスリップ２４に膨張等の変形が生じる可能性がある。この結果、変形したこのラビリンスリップ２４と、前記回転側フランジ１２の段部２７とが接触して、前記車輪支持用転がり軸受ユニット１の運転時の摩擦抵抗が増加してしまう可能性がある。   Therefore, the seal material 18 constituting the seal ring 14a is made of a conductive rubber material obtained by adding a conductivity-imparting agent to a rubber material, and the seal ring 14a (the metal core 17 and the seal material 18) is interposed therebetween. It has been conventionally known that by causing a current to flow between the outer ring 2 and the hub 3, it is possible to prevent the occurrence of noise and malfunction due to the spark as described above. However, the water absorption of the sealing material 18 constituting the seal ring 14a may be increased due to the influence of the conductivity imparting agent or the like. For this reason, if the labyrinth slip 24 constituting the seal ring 14a is provided at a position where it can easily come into contact with muddy water or the like, as in the above-described wheel bearing rolling bearing unit 1, the labyrinth slip 24 absorbs moisture. (Swelling), and deformation such as expansion may occur in the labyrin slip 24. As a result, the deformed labyrin slip 24 and the stepped portion 27 of the rotary flange 12 may come into contact with each other, and the frictional resistance during operation of the wheel support rolling bearing unit 1 may increase.

特開２０１２−１３１４５２号公報JP 2012-131458 A

本発明は、上述の様な事情に鑑み、外輪の軸方向外端面とハブのフランジの軸方向内側面との間にラビリンスシールを設ける構造に於いて、シールリングを介して、前記外輪と前記ハブとの間に電流を流す事ができる構造を採用した場合でも、前記ラビリンスシールを構成するラビリンスリップが水分を吸収して変形する事の防止を図れる構造を実現すべく発明したものである。   In view of the circumstances as described above, the present invention provides a structure in which a labyrinth seal is provided between the axial outer end surface of the outer ring and the axial inner side surface of the flange of the hub. The present invention has been invented to realize a structure capable of preventing the labyrinth slip constituting the labyrinth seal from absorbing and deforming even when a structure capable of passing an electric current between the hub and the hub is adopted.

本発明のシールリング付車輪支持用転がり軸受ユニットは、前述した従来構造のシールリング付車輪支持用転がり軸受ユニットと同様に、外輪と、ハブと、複数個の転動体と、フランジと、シールリングとを備える。
このうちの外輪は、内周面に外輪軌道を有し、懸架装置に支持された状態で回転しない。
又、前記ハブは、外周面のうちで前記外輪軌道と対向する部分に内輪軌道を有し、前記外輪と同心に配置されている。
又、前記各転動体は、前記外輪軌道と前記内輪軌道との間に転動自在に設けられている。
又、前記フランジは、前記ハブの外周面のうちで前記外輪の外端開口部よりも外方に突出した部分に設けられたもので、前記ハブに対し車輪を支持固定する為のものである。
又、前記シールリングは、前記外輪の内周面と前記ハブの外周面との間に存在する転動体配置空間の外端開口部を塞ぐ。
更に、前記フランジは、基端寄り部分に設けられた厚肉部と先端寄り部分に設けられた薄肉部とを、内側面に形成した段部により連続して成るものである。
又、前記シールリングは、前記外輪の外端部に固定される芯金と、この芯金により補強された弾性材製のシール材とから構成される。そして、この芯金は、前記外輪の外端部内周面に内嵌固定される嵌合筒部と、この嵌合筒部の軸方向外端縁から径方向外方に直角に折れ曲がった状態で設けられて、その内側面を前記外輪の外端面に直接又は間接的に突き当てられ、この外輪の外端面の外径寸法よりも大きな外径寸法を有する円輪部とを備える。又、前記シール材は、前記フランジの内側面若しくは前記ハブの外周面に全周に亙り摺接する、少なくとも１本のシールリップと、これら各シールリップのうちで最も径方向外側に設けられたシールリップよりも径方向外方に設けられ、その先端部を前記段部よりも径方向外方に位置させると共に、これら先端部と段部とを径方向に重畳させ、この先端部の外端面を前記フランジの内側面に、同じく内周面を前記段部に、それぞれ近接対向させて、これら先端部とフランジの内側面との間に非接触式のラビリンスシールを形成する、庇状のラビリンスリップとを備える。 The wheel bearing rolling bearing unit with seal ring of the present invention is similar to the wheel bearing rolling bearing unit with seal ring of the conventional structure described above, and includes an outer ring, a hub, a plurality of rolling elements, a flange, and a seal ring. With.
Of these, the outer ring has an outer ring raceway on the inner peripheral surface and does not rotate while being supported by the suspension device.
The hub has an inner ring raceway at a portion of the outer peripheral surface facing the outer ring raceway, and is arranged concentrically with the outer ring.
Each rolling element is provided between the outer ring raceway and the inner ring raceway so as to be freely rollable.
The flange is provided in a portion of the outer peripheral surface of the hub that protrudes outward from the outer end opening of the outer ring, and is used to support and fix the wheel to the hub. .
The seal ring closes the outer end opening of the rolling element arrangement space existing between the inner peripheral surface of the outer ring and the outer peripheral surface of the hub.
Furthermore, the said flange consists of the thick part provided in the part near a base end, and the thin part provided in the part near the front-end | tip by the step part formed in the inner surface.
The seal ring includes a metal core fixed to the outer end of the outer ring, and an elastic seal material reinforced by the metal core. And this core metal is in a state where it is bent at a right angle radially outward from the axially outer end edge of the fitting cylinder part and the fitting cylinder part that is fitted and fixed to the inner peripheral surface of the outer end part of the outer ring. And an annular portion whose inner side surface is directly or indirectly abutted against the outer end surface of the outer ring and has an outer diameter dimension larger than the outer diameter dimension of the outer end surface of the outer ring. In addition, the seal material includes at least one seal lip that is in sliding contact with the inner surface of the flange or the outer peripheral surface of the hub, and a seal provided on the outermost radial direction among these seal lips. It is provided radially outward from the lip, and its tip is positioned radially outward from the step, and the tip and step are overlapped in the radial direction, and the outer end surface of the tip is A saddle-shaped labyrinth slip that forms a non-contact labyrinth seal between the front end portion and the inner side surface of the flange, with the inner peripheral surface facing the stepped portion in close proximity to the inner side surface of the flange. With.

特に、本発明のシールリング付車輪支持用転がり軸受ユニットの場合には、前記シール材が、絶縁性の弾性材により造られた第一のシール部と、導電性の弾性材により造られた第二のシール部とにより構成されている。
又、前記第一のシール部は、前記ラビリンスリップを有する。
又、前記第二のシール部は、前記シールリップを有し、前記外輪及び前記ハブと接触している。 In particular, in the case of the rolling bearing unit for supporting a wheel with a seal ring according to the present invention, the sealing material includes a first sealing portion made of an insulating elastic material and a first sealing portion made of a conductive elastic material. And a second seal portion.
The first seal portion has the labyrinth slip.
The second seal portion has the seal lip and is in contact with the outer ring and the hub.

上述の様な本発明のシールリング付車輪支持用転がり軸受ユニットを実施する場合に例えば、請求項２に記載した発明の様に、前記第一のシール部と前記第二のシール部とを、互いに離隔した状態で前記芯金により補強する。
又、上述の様な本発明のシールリング付車輪支持用転がり軸受ユニットを実施する場合に具体的には、請求項３に記載した発明の様に、前記芯金に少なくとも一つの貫通孔を形成する。又、この芯金の一方側に設けられた第二のシール部の一部と、同じく他方側に設けられた第二のシール部の残部とを、前記貫通孔を介して連続させる。
更に、前記芯金の一方側に設けられた前記第二のシール部の一部を、前記外輪に接触させると共に、同じく他方側に設けられたこの第二のシール部の残部を、前記ハブに接触させる。 When implementing the wheel bearing rolling bearing unit with seal ring of the present invention as described above, for example, as in the invention described in claim 2, the first seal portion and the second seal portion are: Reinforcing with the metal core in a state of being separated from each other.
When the rolling bearing unit for supporting a wheel with a seal ring of the present invention as described above is implemented, specifically, at least one through hole is formed in the cored bar as in the invention described in claim 3. To do. In addition, a part of the second seal portion provided on one side of the metal core and the remaining portion of the second seal portion provided on the other side are continued through the through hole.
Further, a part of the second seal part provided on one side of the core metal is brought into contact with the outer ring, and the remaining part of the second seal part also provided on the other side is connected to the hub. Make contact.

又、上述の様な本発明のシールリング付車輪支持用転がり軸受ユニットを実施する場合に具体的には、請求項４に記載した発明の様に、前記芯金の一方側にある第二のシール部の一部を、この芯金に沿う状態で設ける。そして、その径方向外端を前記外輪と接触させる。
又、上述の様な本発明のシールリング付車輪支持用転がり軸受ユニットを実施する場合に例えば、請求項５に記載した発明の様に、前記第二のシール部に添加している導電性付与剤を、イオン導電性付与剤とする。 In the case of implementing the wheel bearing rolling bearing unit with seal ring of the present invention as described above, specifically, as in the invention described in claim 4, the second on the one side of the core metal. A part of the seal portion is provided along the core bar. Then, the radially outer end is brought into contact with the outer ring.
Further, when the rolling bearing unit for supporting a wheel with a seal ring of the present invention as described above is implemented, for example, as in the invention described in claim 5, the conductivity imparting added to the second seal portion. The agent is an ion conductivity imparting agent.

上述の様に構成する本発明のシールリング付車輪支持用転がり軸受ユニットによれば、外輪の軸方向外端面とハブのフランジの軸方向内側面との間にラビリンスシールを設けた構造に於いて、シールリングを介して、前記外輪と前記ハブとの間に電流を流す事ができる構造を採用した場合でも、前記ラビリンスシールを構成するラビリンスリップが水分を吸収して変形する事の防止を図れる。
即ち、本発明の場合、導電性の弾性材により造った第二のシール部を前記外輪と前記ハブとに接触させると共に、前記ラビリンスリップを設けた第一のシール部を絶縁性の弾性材により造っている。この様に絶縁性の弾性材により造った第一のシール部は、吸水性を低く抑えられる。この為、前記第二のシール部を介して、前記外輪と前記ハブとの間に電流を流して、各転動体の転動面又は内輪、外輪両軌道にスパークに起因する雑音や誤作動が発生する事の防止を図ると共に、前記ラビリンスリップが水分を吸収して変形する事の防止を図れる。この結果、膨張等により変形したこのラビリンスリップが、回転側フランジの段部に接触して、摩擦抵抗が増加する様な事がない。 According to the rolling bearing unit for supporting a wheel with a seal ring of the present invention configured as described above, the labyrinth seal is provided between the axial outer end surface of the outer ring and the axial inner surface of the hub flange. Even when a structure that allows current to flow between the outer ring and the hub via the seal ring is adopted, it is possible to prevent the labyrinth slip that constitutes the labyrinth seal from absorbing and deforming. .
That is, in the case of the present invention, the second seal portion made of a conductive elastic material is brought into contact with the outer ring and the hub, and the first seal portion provided with the labyrin slip is made of an insulating elastic material. Made. Thus, the 1st seal | sticker part made with the insulating elastic material can suppress water absorption low. For this reason, a current or current flows between the outer ring and the hub via the second seal portion, and noise or malfunction caused by sparks on the rolling surface of each rolling element or both inner ring and outer ring raceways. While preventing generation | occurrence | production, it can aim at prevention that the said labyrin slip absorbs a water | moisture content and deform | transforms. As a result, the labyrin slip deformed due to expansion or the like does not come into contact with the step portion of the rotation side flange and the frictional resistance does not increase.

本発明の実施の形態の第１例を示す、図７のＡ部に相当する拡大断面図。The expanded sectional view equivalent to the A section of Drawing 7 showing the 1st example of an embodiment of the invention. 同第２例を示す、図１と同様の図。The figure similar to FIG. 1 which shows the 2nd example. 同第３例を示す、図１と同様の図。The figure similar to FIG. 1 which shows the 3rd example. 同第４例を示す、図１と同様の図。The figure similar to FIG. 1 which shows the 4th example. 同第５例を示す、図１と同様の図。The figure similar to FIG. 1 which shows the same 5th example. 同第６例を示す、図１と同様の図。The figure similar to FIG. 1 which shows the 6th example. 本発明の対象となるシールリング付車輪支持用転がり軸受ユニットの１例を示す断面図。Sectional drawing which shows an example of the rolling bearing unit for wheel support with a seal ring used as the object of this invention. 従来構造の１例を示す、図７のＡ部に相当する拡大断面図。The expanded sectional view equivalent to the A section of Drawing 7 showing an example of conventional structure.

［実施の形態の第１例］
図１は、請求項１〜３、５に対応する、本発明の実施の形態の第１例を示している。尚、本例の特徴は、シールリング１４ｂを構成するシール材１８ａの構造を工夫した点にある。その他の部分の構造及び作用は、前述した従来構造の場合とほぼ同様であるから、重複する説明並びに図示は省略若しくは簡略にし、以下、本例の特徴部分を中心に説明する。 [First example of embodiment]
FIG. 1 shows a first example of an embodiment of the present invention corresponding to claims 1 to 5. The feature of this example is that the structure of the sealing material 18a constituting the seal ring 14b is devised. Since the structure and operation of other parts are almost the same as those of the above-described conventional structure, the overlapping description and illustration are omitted or simplified, and the following description will focus on the characteristic parts of this example.

本例の場合、シール材１８ａを、互いに離隔した状態で芯金１７ａに接合固定した、第一のシール部３２と、第二のシール部３３とにより構成している。
このうちの第一のシール部３２は、絶縁性の弾性材（ゴムの如きエラストマー等）で造られており、前記芯金１７ａを構成する円輪部２０ａの軸方向外側面の径方向外端寄り部分に接合固定している。この様な第一のシール部３２は、前述の従来構造のラビリンスリップ２４と同様に庇状のラビリンスリップ２４ａを有しており、このラビリンスリップ２４ａの外周面を軸方向外方に進む程その外径が大きくなる円錐面状にすると共に、その外径寸法を、外輪２の外端部外周面の外径寸法よりも、十分に大きくしている。 In the case of this example, the sealing material 18a is constituted by a first seal portion 32 and a second seal portion 33, which are joined and fixed to the cored bar 17a while being separated from each other.
Of these, the first seal portion 32 is made of an insulating elastic material (elastomer such as rubber), and the radially outer end of the axially outer surface of the annular portion 20a constituting the cored bar 17a. Bonded and fixed to the side part. The first seal portion 32 has a bowl-shaped labyrin slip 24a like the labyrin slip 24 having the above-described conventional structure, and the more the outer peripheral surface of the labyrin slip 24a advances in the axial direction, the more The outer diameter of the outer ring 2 is sufficiently larger than the outer diameter of the outer peripheral surface of the outer end portion of the outer ring 2.

又、前記ラビリンスリップ２４ａの先端部の位置を、回転側フランジ１２の内側面のうちで基端寄り部分（根元部分）に設けられた厚肉部２５と、同じく先端寄り部分に設けられ、この厚肉部２５よりも肉厚の小さい薄肉部２６とを連続する、段部２７との関係で規制している。即ち、前記ラビリンスリップ２４ａ（の先端部乃至基端部）を、前記段部２７よりも径方向外方に位置させると共に、このラビリンスリップ２４ａの先半部とこの段部２７とを径方向に重畳させている。これにより、このラビリンスリップ２４ａの先端縁と前記回転側フランジ１２の内側面との間に、径方向のラビリンスシール２８ａを形成すると共に、この径方向のラビリンスシール２８ａに連続する状態で、前記ラビリンスリップ２４の先端部内周面と前記段部２７の外周面との間に、軸方向のラビリンスシール２８ｂを形成している。   Further, the position of the tip of the labyrinth slip 24a is provided in the thick portion 25 provided in the base end portion (root portion) of the inner surface of the rotation side flange 12, and also in the tip end portion. The thin-walled portion 26 having a smaller thickness than the thick-walled portion 25 is constrained by the relationship with the stepped portion 27. That is, the labyrin slip 24a (the front end portion or the base end portion thereof) is positioned radially outward from the step portion 27, and the leading half portion of the labyrin slip 24a and the step portion 27 are arranged in the radial direction. Superimposed. Thus, a radial labyrinth seal 28a is formed between the leading edge of the labyrinth slip 24a and the inner side surface of the rotating side flange 12, and the labyrinth is in a state of being continuous with the radial labyrinth seal 28a. An axial labyrinth seal 28 b is formed between the inner peripheral surface of the tip of the lip 24 and the outer peripheral surface of the stepped portion 27.

尚、本例の場合、前記第一のシール部３２に前述した従来構造の庇部２９及び止水部３０（図８参照）を設けていない。但し、本例の場合も、第一のシール部３２に、前記芯金１７ａの円筒部２２ａを覆う状態で庇部２９（図８参照）を形成する事もできる。又、この庇部２９の内周面の軸方向外端に連続し、前記芯金１７ａの円輪部２０ａのうち、前記外輪２の外端面外周縁よりも径方向外方に突出した部分を覆う状態で、止水部を設ける事もできる。又、止水部を前述した従来構造と同様の構造にする事もできる。   In the case of this example, the first seal portion 32 is not provided with the above-described conventional flange portion 29 and water stop portion 30 (see FIG. 8). However, also in this example, the collar part 29 (refer FIG. 8) can also be formed in the 1st seal | sticker part 32 in the state which covers the cylindrical part 22a of the said metal core 17a. Further, a portion of the circular ring portion 20a of the core metal 17a that protrudes radially outward from the outer peripheral edge of the outer end surface of the outer ring 2 is continuous with the axially outer end of the inner peripheral surface of the flange portion 29. In the state of covering, a water stop portion can be provided. In addition, the water stop portion can be formed in the same structure as the conventional structure described above.

又、前記第二のシール部３３は、前述した従来構造のシールリング１４ａ（図８参照）のシール材１８のうちの、前記外輪２の内周面よりも径方向内側部分とほぼ同様の構造を有している。即ち、前記第二のシール部３３は、前記芯金１７ａの嵌合円筒部１９ａと前記円輪部２０ａとの連続部３４からこの芯金１７ａの径方向内端部分に接合固定しており、３本の接触式のシールリップ３５ａ、３５ｂ、３５ｃを有している。又、本例の場合、前記第二のシール部３３を、導電性の弾性材（ゴムの如きエラストマー等に導電性付与剤を添加する等したもの）により造っている。尚、本例の場合、この伝導性付与剤を、イオン導電性付与剤としている。   The second seal portion 33 has a structure that is substantially the same as the radially inner portion of the seal member 18 of the seal ring 14a (see FIG. 8) of the conventional structure described above than the inner peripheral surface of the outer ring 2. have. That is, the second seal portion 33 is joined and fixed from the continuous portion 34 of the fitting cylindrical portion 19a of the metal core 17a and the annular ring portion 20a to the radially inner end portion of the metal core 17a. Three contact-type seal lips 35a, 35b, and 35c are provided. In the case of this example, the second seal portion 33 is made of a conductive elastic material (a material obtained by adding a conductivity-imparting agent to an elastomer such as rubber). In the case of this example, this conductivity imparting agent is an ion conductivity imparting agent.

又、前記芯金１７ａの嵌合円筒部１９ａと前記円輪部２０ａとの連続部３４の一方側（図１の右側）に設けられた外輪接触シール部３６と、同じくこの連続部３４の他方側（図１の左側）に設けられたシール本体部３７とを、前記連続部３４の円周方向の少なくとも１箇所（好ましくは円周方向等間隔複数箇所）に設けた貫通孔３８を介して連続させている。尚、本例の場合、前記外輪接触シール部３６の形状を鉤状に形成している。又、前記貫通孔３８を円形としているが、その形状は特に限定されるものではない。この為、この貫通孔３８は、金属製の板材に加工（プレス加工、曲げ加工等）を施して前記芯金１７ａを形成した状態、或いは、加工を施す前の金属製の板材の状態の何れかの状態で形成すれば良い。又、前記外輪接触シール部３６は、前記芯金１７ａの連続部３４の一方側に全周に亙り設けても良いし、前記貫通孔３８が形成された部分の周囲のみに設けても良い。前記外輪接触シール部３６を全周に亙り設けた場合には、前記芯金１７ａの円輪部２０ａの軸方向内側面と、前記外輪２の軸方向外端面との間を介して、水等の異物が転動体配置空間１５に侵入する事をより効果的に防止できる。   Further, the outer ring contact seal portion 36 provided on one side (right side in FIG. 1) of the continuous portion 34 between the fitting cylindrical portion 19a of the cored bar 17a and the annular ring portion 20a, and the other of the continuous portion 34 The seal main body part 37 provided on the side (left side in FIG. 1) is connected to the continuous part 34 through a through hole 38 provided in at least one place in the circumferential direction (preferably a plurality of places at equal intervals in the circumferential direction). It is continuous. In the case of this example, the shape of the outer ring contact seal portion 36 is formed in a bowl shape. Moreover, although the said through-hole 38 is made circular, the shape is not specifically limited. For this reason, the through-hole 38 is either in a state in which the metal plate material is processed (pressing, bending, etc.) to form the cored bar 17a, or in a state of the metal plate material before being processed. It may be formed in such a state. Further, the outer ring contact seal portion 36 may be provided over the entire circumference on one side of the continuous portion 34 of the cored bar 17a, or may be provided only around the portion where the through hole 38 is formed. When the outer ring contact seal portion 36 is provided over the entire circumference, water or the like is interposed between the axial inner side surface of the circular ring portion 20a of the core metal 17a and the axial outer end surface of the outer ring 2. Can be effectively prevented from entering the rolling element arrangement space 15.

又、本例の場合、前記第二のシール部３３の外輪接触シール部３６の先端部を前記外輪２の軸方向外端面と内周面との連続部に接触させると共に、前記各シールリップ３５ａ、３５ｂ、３５ｃをハブ３の中間部外周面或いは回転側フランジ１２の内側面に、全周に亙り摺接させている。即ち、本例の場合、導電性を有する前記第二のシール部３３を外輪２及びハブ３に接触させている。この為、電流が、この外輪２とこのハブ３との間を、この第二のシール部３３を介して流れる事ができる。尚、前記芯金１７ａとこの第二のシール部３３とを加硫接着等により接合固定する為の接着材（例えば、フェノール樹脂系接着剤、エポキシ樹脂系接着剤等）は、絶縁性を有している為、前記芯金１７ａを介して、前記外輪２から前記第二のシール部３３に電流が流れる事はない。この為に、本例の場合、導電性を有する前記第二のシール部３３を前記外輪２及びハブ３に接触させる事により、電流が、前記外輪２と前記ハブ３との間を流れる様にしている。   In the case of this example, the tip of the outer ring contact seal portion 36 of the second seal portion 33 is brought into contact with the continuous portion between the axially outer end surface and the inner peripheral surface of the outer ring 2 and each of the seal lips 35a. , 35b, and 35c are in sliding contact with the outer peripheral surface of the intermediate portion of the hub 3 or the inner surface of the rotation side flange 12 over the entire periphery. That is, in the case of this example, the conductive second seal portion 33 is brought into contact with the outer ring 2 and the hub 3. Therefore, a current can flow between the outer ring 2 and the hub 3 through the second seal portion 33. Note that an adhesive (for example, a phenol resin adhesive, an epoxy resin adhesive, etc.) for joining and fixing the metal core 17a and the second seal portion 33 by vulcanization adhesion or the like has an insulating property. Therefore, no current flows from the outer ring 2 to the second seal portion 33 through the core bar 17a. Therefore, in the case of this example, the second seal portion 33 having conductivity is brought into contact with the outer ring 2 and the hub 3 so that a current flows between the outer ring 2 and the hub 3. ing.

上述の様な本例のシールリング付車輪支持用転がり軸受ユニットによれば、前記外輪２の軸方向外端面と前記ハブ３ｂの回転側フランジ１２の軸方向内側面との間に前記ラビリンスシール２８ａ、２８ｂを設けた構造に於いて、前記シールリング１４ｂを介して、前記外輪２と前記ハブ３との間に電流を流す事ができる構造を採用した場合でも、前記ラビリンスシール２８ａ、２８ｂを構成するラビリンスリップ２４ａが水分を吸収して変形する事を抑えられる。
即ち、本例の場合、導電性の弾性材により造った前記第二のシール部３３を前記外輪２と前記ハブ３とに接触させると共に、前記ラビリンスリップ２４ａを設けた第一のシール部３２を絶縁性の弾性材により造っている。この様に絶縁性の弾性材で造った第一のシール部３２は、吸水性を低く抑えられる。この為、前記第二のシール部３３を介して、前記外輪２と前記ハブ３との間に電流を流し、ラジオの雑音や、電子機器の誤作動に結び付くスパークが発生する事の防止を図ると共に、前記ラビリンスリップ２４ａが水分を吸収して変形する事を抑えられる。この結果、膨張等により変形したこのラビリンスリップ２４ａが、前記回転側フランジ１２の段部２７に接触して、運転時の摩擦抵抗が増加する様な事がない。尚、導電性を有する前記第二のシール部３３は、吸水性が高くなる可能性がある。但し、この第二のシール部３３は、使用状態に於いて、その表面に潤滑グリースが塗布されており、且つ、この第二のシール部３３が設けられた位置には、前記各ラビリンスシール２８ａ、２８ｂの影響で水分が侵入しづらい。又、前記各シールリップ３５ａ、３５ｂ、３５ｃの摩擦熱により、前記第二のシール部３３の温度も上昇している為、この第二のシール部３３が水分を吸収して変形する可能性は低い。 According to the wheel support rolling bearing unit with seal ring of the present example as described above, the labyrinth seal 28a is provided between the axial outer end surface of the outer ring 2 and the axial inner side surface of the rotation side flange 12 of the hub 3b. , 28b, the labyrinth seals 28a and 28b are configured even when a structure that allows current to flow between the outer ring 2 and the hub 3 via the seal ring 14b is adopted. This prevents the labyrin slip 24a from absorbing moisture and deforming.
That is, in this example, the second seal portion 33 made of a conductive elastic material is brought into contact with the outer ring 2 and the hub 3, and the first seal portion 32 provided with the labyrin slip 24a is provided. It is made of insulating elastic material. Thus, the 1st seal | sticker part 32 made with the insulating elastic material can suppress water absorption low. For this reason, a current is passed between the outer ring 2 and the hub 3 through the second seal portion 33 to prevent radio noise and sparks that may lead to malfunction of electronic equipment. At the same time, the labyrinth slip 24a is prevented from absorbing moisture and deforming. As a result, the labyrin slip 24a deformed due to expansion or the like does not come into contact with the stepped portion 27 of the rotating side flange 12, and the frictional resistance during operation does not increase. In addition, there is a possibility that the second seal portion 33 having conductivity has high water absorption. However, when the second seal portion 33 is in use, the surface thereof is coated with lubricating grease, and the labyrinth seals 28a are provided at positions where the second seal portion 33 is provided. , 28b makes it difficult for moisture to enter. Further, since the temperature of the second seal portion 33 is also increased by the frictional heat of the seal lips 35a, 35b, and 35c, there is a possibility that the second seal portion 33 absorbs moisture and deforms. Low.

［実施の形態の第２例］
図２も、請求項１〜３、５に対応する、本発明の実施の形態の第２例を示している。本例の場合、シールリング１４ｃを構成する芯金１７ｂを、前述した実施の形態の第１例の芯金１７ａの円筒部２２ａを省略した如き形状としている。又、本例の場合、前記芯金１７ｂの円輪部２０ａの径方向内端寄り部分の円周方向の少なくとも１箇所（好ましくは円周方向等間隔複数箇所）に貫通孔３８ａを形成している。 [Second Example of Embodiment]
FIG. 2 also shows a second example of the embodiment of the present invention corresponding to claims 1 to 5. In the case of this example, the cored bar 17b constituting the seal ring 14c has a shape such that the cylindrical portion 22a of the cored bar 17a of the first example of the embodiment described above is omitted. In the case of this example, a through hole 38a is formed in at least one place (preferably a plurality of places at equal intervals in the circumferential direction) in the radial direction inner end portion of the annular part 20a of the cored bar 17b. Yes.

又、本例の場合も、前記シールリング１４ｃのシール材１８ｂを構成する第一のシール部３２ａを絶縁性の弾性材により、同じく第二のシール部３３ａを導電性の弾性材により、それぞれ造っている。
又、前記第一のシール部３２ａの一部を、前記芯金１７ｂの円輪部２０ａの軸方向内側面の径方向外端部から径方向中間部を覆う状態で設けて、当該部分を止水部３０ａとしている。そして、この止水部３０ａを、前記芯金１７ｂの円輪部２０ａの軸方向内側面と、外輪２の軸方向外端面との間に配置している。尚、前記止水部３０ａの軸方向内側面に全周に亙って突出形成した突条を、外輪２の軸方向外端面に当接させて、シール性の確保を図っている。 Also in this example, the first seal portion 32a constituting the seal material 18b of the seal ring 14c is made of an insulating elastic material, and the second seal portion 33a is also made of a conductive elastic material. ing.
In addition, a part of the first seal portion 32a is provided so as to cover the radial intermediate portion from the radial outer end portion of the axial inner side surface of the annular ring portion 20a of the core bar 17b, and the portion is stopped. The water portion 30a is used. And this water stop part 30a is arrange | positioned between the axial direction inner surface of the annular ring part 20a of the said core metal 17b, and the axial direction outer end surface of the outer ring | wheel 2. As shown in FIG. In addition, the protrusion formed over the entire circumference of the axially inner side surface of the water stop portion 30a is brought into contact with the axially outer end surface of the outer ring 2 to ensure sealing performance.

又、前記第二のシール部３３ａの一部で、前記芯金１７ｂの円輪部２０ａの一方側（軸方向内側で、図２の右側）に設けられた外輪接触シール部３６ａを、断面略長方形状に形成している。そして、前述した実施の形態の第１例と同様に、この外輪接触シール部３６ａと、前記芯金１７ｂの円輪部２０ａの他方側（軸方向外側、図２の左側）に設けられたシール本体部３７ａとを、前記貫通孔３８ａを介して連続させている。尚、前記外輪接触シール部３６ａは、前記芯金１７ｂの円輪部２０ａの一方側に全周に亙り設けても良いし、前記貫通孔３８ａが形成された部分の周囲のみに設けても良い。前記外輪接触シール部３６ａを全周に亙り設けた場合には、芯金１７ｂの円輪部２０ａの軸方向内側面と、前記外輪２の軸方向外端面との間を介して、水等の異物が転動体配置空間１５に浸入する事を、前記止水部３０ａと合わせてより効果的に防止できる。その他の部分の構造及び作用・効果は、前述した実施の形態の第１例と同様であるから、同等部分に関する説明は省略する。   In addition, an outer ring contact seal portion 36a provided on one side of the annular portion 20a of the metal core 17b (on the inner side in the axial direction and on the right side in FIG. 2) is a part of the second seal portion 33a. It is formed in a rectangular shape. As in the first example of the embodiment described above, the outer ring contact seal portion 36a and the seal provided on the other side (the axially outer side, the left side in FIG. 2) of the ring portion 20a of the core metal 17b. The main body portion 37a is continued through the through hole 38a. The outer ring contact seal portion 36a may be provided over the entire circumference on one side of the ring portion 20a of the core metal 17b, or may be provided only around the portion where the through hole 38a is formed. . When the outer ring contact seal portion 36a is provided over the entire circumference, water or the like is interposed between the axial inner side surface of the circular ring portion 20a of the core metal 17b and the axial outer end surface of the outer ring 2. It can prevent more effectively that a foreign material penetrate | invades into the rolling element arrangement | positioning space 15 with the said water stop part 30a. Since the structure, operation, and effect of the other parts are the same as those of the first example of the above-described embodiment, the description of the equivalent parts is omitted.

［実施の形態の第３例］
図３も、請求項１〜３、５に対応する、本発明の実施の形態の第３例を示している。本例の場合、芯金１７ｃの嵌合円筒部１９ａの軸方向内端部と、この芯金１７ｃの折れ曲がり部２１ａとの連続部３９の円周方向の少なくとも１箇所（好ましくは周方向等間隔複数箇所）に貫通孔３８ｂを形成している。
又、本例の場合も、シールリング１４ｄのシール材１８ｃを構成する第一のシール部３２ｂを、絶縁性の弾性材（ゴムの如きエラストマー等）により、同じく第二のシール部３３ｂを導電性の弾性材（ゴムの如きエラストマー等に導電性付与剤を添加する等したもの）により、それぞれ造っている。
又、前記第一のシール部３２ｂの止水部３０ｂを、前述した実施の形態の第２例の止水部３０ａよりも、更に径方向内方に延長させた状態で設けている。即ち、本例の場合、前記止水部３０ｂを、芯金１７ｃの円輪部２０ａの軸方向内側面の径方向外端部から、この円輪部２０ａと前記嵌合円筒部１９ａとの連続部３４に掛けての部分に設けている。 [Third example of embodiment]
FIG. 3 also shows a third example of the embodiment of the present invention corresponding to claims 1 to 5. In the case of this example, at least one circumferential portion of the continuous portion 39 (preferably circumferentially equidistant) between the axially inner end portion of the fitting cylindrical portion 19a of the core metal 17c and the bent portion 21a of the core metal 17c. Through holes 38b are formed at a plurality of locations.
Also in this example, the first seal portion 32b constituting the seal material 18c of the seal ring 14d is made of an insulating elastic material (elastomer such as rubber) and the second seal portion 33b is made conductive. These are made of elastic materials (e.g., those obtained by adding a conductivity-imparting agent to an elastomer such as rubber).
Moreover, the water stop part 30b of the first seal part 32b is provided in a state of extending further radially inward than the water stop part 30a of the second example of the above-described embodiment. That is, in the case of this example, the water stop portion 30b is continuously connected from the radially outer end portion on the axial inner side surface of the annular portion 20a of the metal core 17c to the annular portion 20a and the fitting cylindrical portion 19a. It is provided in the part hung on the part 34.

又、前記第二のシール部３３ｂの一部で、前記芯金１７ｃの連続部３９の一方側（軸方向内側で、図３の右側）に設けられた外輪接触シール部３６ｂを、前述の実施の形態の第１例と同様に鉤状に形成している。
そして、前記外輪接触シール部３６ｂと、前記芯金１７ｃの連続部３９の他方側（軸方向外側、図３の左側）に設けられたシール本体部３７ｂとを、前記貫通孔３８ｂを介して連続させている。
上述の様な本例の構造によれば、前記芯金１７ｃの円輪部２０ａの軸方向内側面と、外輪２の軸方向外端面との間を介して、水等の異物が転動体配置空間１５に浸入する事を、前記止水部３０ｂにより効果的に防止できる。その他の部分の構造及び作用・効果は、前述した実施の形態の第２例と同様であるから、同等部分に関する説明は省略する。 Further, the outer ring contact seal portion 36b provided on one side of the continuous portion 39 of the metal core 17c (in the axial direction, on the right side in FIG. 3), which is a part of the second seal portion 33b, is used as described above. Like the first example of the form, it is formed in a bowl shape.
Then, the outer ring contact seal portion 36b and the seal body portion 37b provided on the other side (the axially outer side, the left side in FIG. 3) of the continuous portion 39 of the cored bar 17c are continuously connected through the through hole 38b. I am letting.
According to the structure of this example as described above, foreign matter such as water is disposed between the rolling elements through the space between the axial inner side surface of the annular portion 20a of the core metal 17c and the axial outer end surface of the outer ring 2. Intrusion into the space 15 can be effectively prevented by the water stop portion 30b. Since the structure, operation, and effect of the other parts are the same as those of the second example of the above-described embodiment, the description of the equivalent parts is omitted.

［実施の形態の第４例］
図４は、請求項１〜２、４〜５に対応する、本発明の実施の形態の第４例を示している。本例の場合、前述の実施の形態の第１例の様な貫通孔３８（図１参照）を芯金に形成していない。この為に、本例の場合、シールリング１４ｅのシール材１８ｄを構成する第二のシール部３３ｃの一部を、芯金１７ｄの一方側（軸方向内側で、図４の右側）の、折れ曲がり部２１ａの径方向外端からこの芯金１７ｄの径方向内端に掛けての部分に沿う状態で設けている。そして、当該部分を外輪接触シール部３６ｃとしている。 [Fourth Example of Embodiment]
FIG. 4 shows a fourth example of an embodiment of the present invention corresponding to claims 1 to 2 and 4 to 5. In the case of this example, the through hole 38 (see FIG. 1) as in the first example of the above-described embodiment is not formed in the cored bar. Therefore, in the case of this example, a part of the second seal portion 33c constituting the seal member 18d of the seal ring 14e is bent on one side of the core metal 17d (on the inner side in the axial direction, on the right side in FIG. 4). It is provided in a state along a portion extending from the radially outer end of the portion 21a to the radially inner end of the core bar 17d. And the said part is used as the outer ring | wheel contact seal part 36c.

又、この外輪接触シール部３６ｃの径方向外端を外輪２の内周面に接触させると共に、その径方向内端部を、シール本体部３７ｃを構成する各シールリップ３５ａ、３５ｂ、３５ｃのうちの最も径方向内方のシールリップ３５ｃの基端部に連続させている。この様な外輪接触シール部３６ｃは、全周に亙り連続した状態で設けている。但し、円周方向の１箇所、或いは、複数箇所に間欠的に設ける事もできる。尚、本例の場合も、前記シールリング１４ｅのシール材１８ｄを構成する第一のシール部３２ｃを絶縁性の弾性材（ゴムの如きエラストマー等）により、同じく前記第二のシール部３３ｃを導電性の弾性材（ゴムの如きエラストマー等に導電性付与剤を添加する等したもの）により、それぞれ造っている。その他の部分の構造及び作用・効果は、前述した実施の形態の第１例と同様であるから、同等部分に関する説明は省略する。   In addition, the radially outer end of the outer ring contact seal portion 36c is brought into contact with the inner peripheral surface of the outer ring 2, and the radially inner end portion is made of the seal lips 35a, 35b, 35c constituting the seal body portion 37c. The base end portion of the seal lip 35c that is radially inward is continuous. Such an outer ring contact seal portion 36c is provided in a continuous state over the entire circumference. However, it can also be provided intermittently at one place in the circumferential direction or at a plurality of places. Also in this example, the first seal portion 32c constituting the seal material 18d of the seal ring 14e is made of an insulating elastic material (elastomer such as rubber), and the second seal portion 33c is also electrically conductive. Each of which is made of an elastic material (e.g., an elastomer such as rubber added with a conductivity-imparting agent). Since the structure, operation, and effect of the other parts are the same as those of the first example of the above-described embodiment, the description of the equivalent parts is omitted.

［実施の形態の第５例］
図５は、請求項１〜２、４〜５に対応する、本発明の実施の形態の第５例を示している。本例の場合、前述の実施の形態の第１例の様な貫通孔３８（図１参照）を芯金に形成していない。
又、本例の場合も、シールリング１４ｆのシール材１８ｅを構成する第一のシール部３２ｄを絶縁性の弾性材（ゴムの如きエラストマー等）により、同じく前記第二のシール部３３ｄを導電性の弾性材（ゴムの如きエラストマー等に導電性付与剤を添加する等したもの）により、それぞれ造っている。 [Fifth Example of Embodiment]
FIG. 5 shows a fifth example of an embodiment of the present invention corresponding to claims 1 to 2 and 4 to 5. In the case of this example, the through hole 38 (see FIG. 1) as in the first example of the above-described embodiment is not formed in the cored bar.
Also in this example, the first seal portion 32d constituting the seal material 18e of the seal ring 14f is made of an insulating elastic material (elastomer such as rubber), and the second seal portion 33d is made conductive. These are made of elastic materials (e.g., those obtained by adding a conductivity-imparting agent to an elastomer such as rubber).

又、前記第一のシール部３２ｄの基端部を、芯金１７ｅの円輪部２０ａの一方側面（軸方向内側面）の径方向外端から径方向中間部で外輪２の外周面より少しだけ径方向内側となる位置に設けている。そして、当該部分を止水部３０ｃとしている。又、前記第一のシール部３２ｄは、前記芯金１７ｅの円輪部２０ａの他方側面（軸方向外側面）の径方向外端寄り部分に設けたラビリンスリップ２４ａと、このラビリンスリップ２４ａよりも径方向内側に設けられた１本のシールリップ３５ｄとを有する。この様なラビリンスリップ２４ａとシールリップ３５ｄとは、それぞれの基端部同士を、前記芯金１７ｅの他方側面の径方向中間部に設けたシール側連続部４１により径方向に連続している。即ち、本例の場合、前述した実施の形態の各例の第二のシール部３３〜３３ｃの各シールリップ３５ａ、３５ｂ、３５ｃのうちの、径方向外方のシールリップ３５ａを、前記第一のシール部３２ｄに設けた、前記シールリップ３５ｄとしている。   In addition, the base end portion of the first seal portion 32d is slightly smaller than the outer peripheral surface of the outer ring 2 from the radially outer end of one side surface (the inner side surface in the axial direction) of the circular ring portion 20a of the core metal 17e. It is provided at a position that is only radially inward. And the said part is made into the water stop part 30c. Further, the first seal portion 32d includes a labyrinth slip 24a provided near the radially outer end of the other side surface (axially outer side surface) of the annular portion 20a of the core metal 17e, and the labyrinth slip 24a. And one seal lip 35d provided on the radially inner side. Such a labyrinth slip 24a and a seal lip 35d are continuous in the radial direction by the seal side continuous portion 41 provided at the intermediate portion in the radial direction of the other side surface of the core bar 17e. That is, in the case of this example, of the seal lips 35a, 35b, and 35c of the second seal portions 33 to 33c of each example of the above-described embodiment, the radially outer seal lip 35a is used as the first seal lip 35a. The sealing lip 35d is provided in the sealing portion 32d.

一方、前記第二のシール部３３ｄは、前述した実施の形態の第４例と同様の外輪接触シール部３６ｃと、２本のシールリップ３５ｂ、３５ｃとを有する。この様な第二のシール部３３ｄは、前記外輪接触シール部３６ｃの径方向外端を前記外輪２の内周面に接触させると共に、前記各シールリップ３５ｂ、３５ｃをハブ３の中間部外周面或いは回転側フランジ１２の内側面の径方向内端に、全周に亙り摺接させている。   On the other hand, the second seal portion 33d has an outer ring contact seal portion 36c similar to the fourth example of the embodiment described above, and two seal lips 35b and 35c. Such a second seal portion 33d makes the radially outer end of the outer ring contact seal portion 36c contact the inner peripheral surface of the outer ring 2, and the seal lips 35b and 35c are connected to the outer peripheral surface of the intermediate portion of the hub 3. Or it is made to slidably contact with the inner periphery of the inner surface of the rotation side flange 12 over the entire circumference.

この様な本例の場合、導電性を有する前記第二のシール部３３ｄを、前記第一のシール部３２ｄのシールリップ３５ｄにより外部空間から完全に隔離する事ができる。この為、前記第二のシール部３３ｄが水分を吸収して変形する事をより効果的に防止できる。その他の部分の構造及び作用・効果は、前述した実施の形態の第１例と同様であるから、同等部分に関する説明は省略する。   In the case of this example, the conductive second seal portion 33d can be completely isolated from the external space by the seal lip 35d of the first seal portion 32d. For this reason, it can prevent more effectively that said 2nd seal | sticker part 33d absorbs a water | moisture content and deform | transforms. Since the structure, operation, and effect of the other parts are the same as those of the first example of the above-described embodiment, the description of the equivalent parts is omitted.

［実施の形態の第６例］
図６は、請求項１〜２、４〜５に対応する、本発明の実施の形態の第６例を示している。本例の芯金１７ｅの構造は、上述した実施の形態の第５例の構造と同様である。又、本例の場合も、シールリング１４ｇのシール材１８ｆを構成する第一のシール部３２ｅを絶縁性の弾性材（ゴムの如きエラストマー等）により、同じく第二のシール部３３ｅを導電性の弾性材（ゴムの如きエラストマー等に導電性付与剤を添加する等したもの）により、それぞれ造っている。 [Sixth Example of Embodiment]
FIG. 6 shows a sixth example of an embodiment of the present invention corresponding to claims 1 to 2 and 4 to 5. The structure of the cored bar 17e of this example is the same as the structure of the fifth example of the embodiment described above. Also in this example, the first seal portion 32e constituting the seal material 18f of the seal ring 14g is made of an insulating elastic material (elastomer such as rubber), and the second seal portion 33e is made conductive. Each is made of an elastic material (a material obtained by adding a conductivity-imparting agent to an elastomer such as rubber).

又、前記第一のシール部３２ｅは、前記芯金１７ｅの円輪部２０ａの他方側面（軸方向外側面）の径方向外端寄り部分に設けたラビリンスリップ２４ａと、このラビリンスリップ２４ａよりも径方向内側に設けられた２本のシールリップ３５ｄ、３５ｅとを有する。即ち、本例の場合、前述した実施の形態の第５例の第一のシール部３２ｄ（図５参照）の構造に加えて、この第一のシール部３２ｅのシールリップ３５ｄの径方向内側に前記シールリップ３５ｅを設けている。この様な各シールリップ３５ｄ、３５ｅは、前述した実施の形態の各例の第二のシール部３３〜３３ｃの各シールリップ３５ａ、３５ｂ、３５ｃのうちの、径方向外側に設けられたシールリップ３５ａと、同じく径方向に関して中間に設けられたシールリップ３５ｂとに相当するものである。更に、前記第一のシール部３２ｅを、芯金１７ｅの円輪部２０ａの一方側面（軸方向内側面）の径方向外端から径方向内端部に掛けての部分にも設けている。そして、当該部分を止水部３０ｄとしている。   Further, the first seal portion 32e includes a labyrinth slip 24a provided near the radially outer end of the other side surface (axially outer side surface) of the annular portion 20a of the cored bar 17e, and the labyrinth slip 24a. It has two seal lips 35d and 35e provided inside in the radial direction. That is, in the case of the present example, in addition to the structure of the first seal portion 32d (see FIG. 5) of the fifth example of the above-described embodiment, the seal lip 35d of the first seal portion 32e is radially inward. The seal lip 35e is provided. Such seal lips 35d and 35e are seal lips provided on the radially outer side of the seal lips 35a, 35b and 35c of the second seal portions 33 to 33c in the examples of the above-described embodiments. This corresponds to 35a and a seal lip 35b provided in the middle in the same radial direction. Furthermore, the first seal portion 32e is also provided on a portion of one side surface (inner axial side surface) of the annular ring portion 20a of the cored bar 17e from the radial outer end to the radial inner end portion. And the said part is made into the water stop part 30d.

一方、前記第二のシール部３３ｅは、前述した実施の形態の第４例と同様の外輪接触シール部３６ｃと、その基端部をこの外輪接触シール部３６ｃに連続させたシールリップ３５ｆとを有する。即ち、本例の場合、前記第二のシール部３３ｅの全体を前記芯金１７ｅの一方側（軸方向内側）に設けている。この様な第二のシール部３３ｅは、前記外輪接触シール部３６ｃの径方向外端を外輪２の内周面に接触させると共に、前記シールリップ３５ｆをハブ３の中間部外周面に、全周に亙り摺接させている。   On the other hand, the second seal portion 33e includes an outer ring contact seal portion 36c similar to the fourth example of the embodiment described above, and a seal lip 35f having a base end portion continuous with the outer ring contact seal portion 36c. Have. That is, in the case of this example, the entire second seal portion 33e is provided on one side (axially inner side) of the cored bar 17e. Such a second seal portion 33e makes the outer circumferential contact end of the outer ring contact seal portion 36c come into contact with the inner peripheral surface of the outer ring 2, and the seal lip 35f is placed on the outer peripheral surface of the intermediate portion of the hub 3 over the entire circumference. Slid in contact with

この様な本例の場合、導電性を有する前記第二のシール部３３ｅを、前記第一のシール部３２ｅの各シールリップ３５ｄ、３５ｅにより外部空間から完全に隔離する事ができる。この為、前記第二のシール部３３ｅが水分を吸収して変形する事を、前述の実施の形態の第５例の構造よりも、更に効果的に防止できる。その他の部分の構造及び作用・効果は、前述した実施の形態の第１例と同様であるから、同等部分に関する説明は省略する。   In the case of this example, the conductive second seal portion 33e can be completely isolated from the external space by the respective seal lips 35d and 35e of the first seal portion 32e. For this reason, it is possible to more effectively prevent the second seal portion 33e from absorbing and deforming moisture than the structure of the fifth example of the above-described embodiment. Since the structure, operation, and effect of the other parts are the same as those of the first example of the above-described embodiment, the description of the equivalent parts is omitted.

本発明を実施する場合、前述した実施の形態の各例の芯金、或いは第一、第二の各シール部の構造は適宜組み合わせて実施する事ができる。   When practicing the present invention, the core bar of each example of the above-described embodiment, or the structure of the first and second seal portions can be combined as appropriate.

１ シールリング付車輪支持用転がり軸受ユニット
２ 外輪
３ ハブ
４ 転動体
５ 静止側フランジ
６ 外輪軌道
７ ハブ本体
８ 内輪
９ ナット
１０ 内輪軌道
１１ 保持器
１２ 回転側フランジ
１３ スタッド
１４、１４ａ、１４ｂ、１４ｃ、１４ｄ、１４ｅ、１４ｆ、１４ｇ シールリング
１５ 転動体配置空間
１６ カバー
１７、１７ａ、１７ｂ、１７ｃ、１７ｄ、１７ｅ 芯金
１８、１８ａ、１８ｂ、１８ｃ、１８ｄ、１８ｅ、１８ｆ シール材
１９、１９ａ 嵌合筒部
２０、２０ａ 円輪部
２１、２１ａ 折れ曲がり部
２２、２２ａ 円筒部
２３ａ、２３ｂ、２３ｃ シールリップ
２４、２４ａ ラビリンスリップ
２５ 厚肉部
２６ 薄肉部
２７ 段部
２８ａ、２８ｂ ラビリンスシール
２９ 庇部
３０、３０ａ、３０ｂ、３０ｃ、３０ｄ 止水部
３１ 環状隙間
３２、３２ａ、３２ｂ、３２ｃ、３２ｄ、３２ｅ 第一のシール部
３３、３３ａ、３３ｂ、３３ｃ、３３ｄ、３３ｅ 第二のシール部
３４ 連続部
３５ａ、３５ｂ、３５ｃ、３５ｄ、３５ｅ、３５ｆ シールリップ
３６、３６ａ、３６ｂ、３６ｃ 外輪接触シール部
３７、３７ａ、３７ｂ、３７ｃ シール本体部
３８、３８ａ、３８ｂ 貫通孔
３９ 連続部
４１ シール連続部 DESCRIPTION OF SYMBOLS 1 Rolling bearing unit for wheel support with seal ring 2 Outer ring 3 Hub 4 Rolling body 5 Static side flange 6 Outer ring raceway 7 Hub body 8 Inner ring 9 Nut 10 Inner ring raceway 11 Cage 12 Rotation side flange 13 Stud 14, 14a, 14b, 14c , 14d, 14e, 14f, 14g Seal ring 15 Rolling element arrangement space 16 Cover 17, 17a, 17b, 17c, 17d, 17e Core metal 18, 18a, 18b, 18c, 18d, 18e, 18f Sealing material 19, 19a Fitting Cylindrical part 20, 20a Annular part 21, 21a Bent part 22, 22a Cylindrical part 23a, 23b, 23c Seal lip 24, 24a Labyrin slip 25 Thick part 26 Thin part 27 Step part 28a, 28b Labyrinth seal 29 Cage part 30, 30a, 30b, 30c, 30d Water stop part 3 Annular gap 32, 32a, 32b, 32c, 32d, 32e First seal part 33, 33a, 33b, 33c, 33d, 33e Second seal part 34 Continuous part 35a, 35b, 35c, 35d, 35e, 35f Seal lip 36, 36a, 36b, 36c Outer ring contact seal part 37, 37a, 37b, 37c Seal body part 38, 38a, 38b Through hole 39 Continuous part 41 Seal continuous part

Claims (5)

内周面に外輪軌道を有し、懸架装置に支持された状態で回転しない外輪と、
外周面のうちでこの外輪軌道と対向する部分に内輪軌道を有し、この外輪と同心に配置されたハブと、
前記外輪軌道と前記内輪軌道との間に転動自在に設けられた複数個の転動体と、
このハブの外周面のうちで前記外輪の外端開口部よりも外方に突出した部分に設けられた、このハブに対し車輪を支持固定する為のフランジと、
前記外輪の内周面とこのハブの外周面との間に存在する転動体配置空間の外端開口部を塞ぐ為のシールリングとを備え、
前記フランジは、基端寄り部分に設けられた厚肉部と先端寄り部分に設けられた薄肉部とを、内側面に形成した段部により連続して成るものであり、
このうちのシールリングは、
前記外輪の外端部内周面に内嵌固定される嵌合筒部、及び、この嵌合筒部の軸方向外端縁から径方向外方に直角に折れ曲がった状態で設けられて、その内側面を前記外輪の外端面に直接又は間接的に突き当てられ、この外輪の外端面の外径寸法よりも大きな外径寸法を有する円輪部から成る芯金と、
この芯金により補強された弾性材製のシール材とから成り、このシール材は、前記フランジの内側面若しくは前記ハブの外周面に全周に亙り摺接する少なくとも１本のシールリップと、
これら各シールリップのうち最も径方向外側に設けられたシールリップよりも径方向外方に設けられ、その先端部を前記段部よりも径方向外方に位置させると共に、これら先端部と段部とを径方向に重畳させ、この先端部の外端面を前記フランジの内側面に、同じく内周面を前記段部に、それぞれ対向させて、前記先端部と、このフランジの内側面及びこの段部との間にラビリンスシールを形成するラビリンスリップとを備えたものである、シールリング付車輪支持用転がり軸受ユニットに於いて、
前記シール材が、絶縁性の弾性材により造られた第一のシール部と、導電性の弾性材により造られた第二のシール部とにより構成されており、
前記第一のシール部は、前記ラビリンスリップを有しており、
前記第二のシール部は、前記シールリップを有し、前記外輪及び前記ハブと接触している事を特徴とするシールリング付車輪支持用転がり軸受ユニット。 An outer ring that has an outer ring raceway on its inner peripheral surface and does not rotate while being supported by a suspension device;
A hub that has an inner ring raceway in a portion of the outer peripheral surface facing the outer ring raceway, and is arranged concentrically with the outer ring;
A plurality of rolling elements provided in a freely rollable manner between the outer ring raceway and the inner ring raceway;
A flange for supporting and fixing the wheel to the hub, provided on a portion of the outer peripheral surface of the hub that protrudes outward from the outer end opening of the outer ring,
A seal ring for closing the outer end opening of the rolling element arrangement space existing between the inner peripheral surface of the outer ring and the outer peripheral surface of the hub;
The flange is formed by continuously forming a thick portion provided at the proximal end portion and a thin portion provided at the distal end portion by a step portion formed on the inner surface,
Of these seal rings,
A fitting cylinder part fitted and fixed to the inner peripheral surface of the outer end part of the outer ring, and a state where the fitting cylinder part is bent at a right angle radially outward from the axial outer end edge of the fitting cylinder part. A cored bar made of an annular portion whose side surface is directly or indirectly abutted against the outer end surface of the outer ring and has an outer diameter larger than the outer diameter of the outer end surface of the outer ring;
A seal material made of an elastic material reinforced by the metal core, and the seal material includes at least one seal lip that is in sliding contact with the inner surface of the flange or the outer peripheral surface of the hub,
Among these seal lips, the seal lip provided on the outermost radial direction is provided on the outer side in the radial direction, and the tip end portion thereof is positioned on the radially outer side with respect to the stepped portion. Are overlapped in the radial direction, with the outer end surface of the tip portion facing the inner surface of the flange and the inner peripheral surface facing the step portion, respectively, and the tip portion, the inner surface of the flange, and the step In a rolling bearing unit for supporting a wheel with a seal ring, comprising a labyrinth slip forming a labyrinth seal with the part,
The sealing material is composed of a first seal portion made of an insulating elastic material and a second seal portion made of a conductive elastic material,
The first seal portion has the labyrinth slip,
The wheel support rolling bearing unit with a seal ring, wherein the second seal portion has the seal lip and is in contact with the outer ring and the hub. 前記第一のシール部と前記第二のシール部とが、互いに離隔した状態で前記芯金により補強されている、請求項１に記載したシールリング付車輪支持用転がり軸受ユニット。   The rolling bearing unit for wheel support with a seal ring according to claim 1, wherein the first seal part and the second seal part are reinforced by the cored bar in a state of being separated from each other. 前記芯金に少なくとも一つの貫通孔が形成されてれおり、
前記芯金の一方側に設けられた第二のシール部の一部と、同じく他方側に設けられた第二のシール部の残部とが、この貫通孔を介して連続しており、
前記芯金の一方側に設けられた前記第二のシール部の一部が、前記外輪と接触しており、同じく他方側に設けられたこの第二のシール部の残部が、前記ハブと接触している、請求項１〜２のうちの何れか１項に記載したシールリング付車輪支持用転がり軸受ユニット。 At least one through hole is formed in the cored bar,
A part of the second seal part provided on one side of the metal core and the remaining part of the second seal part also provided on the other side are continuous through this through hole,
A part of the second seal part provided on one side of the core metal is in contact with the outer ring, and the remaining part of the second seal part provided on the other side is in contact with the hub. The rolling bearing unit for wheel support with a seal ring as described in any one of Claims 1-2. 前記芯金の一方側にある第二のシール部の一部が、この芯金に沿う状態で設けられており、その径方向外端が、前記外輪と接触している、請求項１〜２のうちの何れか１項に記載したシールリング付車輪支持用転がり軸受ユニット。   A part of the second seal portion on one side of the cored bar is provided in a state along the cored bar, and a radially outer end thereof is in contact with the outer ring. A rolling bearing unit for supporting a wheel with a seal ring described in any one of the above. 前記第二のシール部に添加している導電性付与剤が、イオン導電性付与剤である、請求項１〜４のうちの何れか１項に記載したシールリング付車輪支持用転がり軸受ユニット。   The wheel bearing rolling bearing unit with a seal ring according to any one of claims 1 to 4, wherein the conductivity imparting agent added to the second seal portion is an ionic conductivity imparting agent.
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