JP2003074568A - Seal structure of rolling bearing - Google Patents

Seal structure of rolling bearing

Info

Publication number
JP2003074568A
JP2003074568A JP2001265127A JP2001265127A JP2003074568A JP 2003074568 A JP2003074568 A JP 2003074568A JP 2001265127 A JP2001265127 A JP 2001265127A JP 2001265127 A JP2001265127 A JP 2001265127A JP 2003074568 A JP2003074568 A JP 2003074568A
Authority
JP
Japan
Prior art keywords
seal
lip portion
seal lip
rolling bearing
race member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001265127A
Other languages
Japanese (ja)
Inventor
Takahiro Aeba
貴博 饗庭
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP2001265127A priority Critical patent/JP2003074568A/en
Publication of JP2003074568A publication Critical patent/JP2003074568A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
    • 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
    • F16C19/185—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 two raceways provided integrally on a part other than a race ring, e.g. a shaft or housing
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)

Abstract

PROBLEM TO BE SOLVED: To obtain a well seal between the inner race member and the outer race member and enhance conductivity of the rolling bearing. SOLUTION: A plurality of rolling bodies are disposed between the inner ring and the hub. The seal structure is a seal structure of a rolling bearing used for a bicycle wheel in which a seal member is settled at the axial end. The seal member is formed of first seal lips 71, 72 securing airtightness between the inner ring and the hub, second seal lips 73 whose the contact area of the sliding contact with the race member side is larger than the first seal lips 71, 72, and a third seal lip 74 pressing the second seal lip 73 to the race member side of the sliding contact side.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、転がり軸受のシー
ル構造に関し、特に、車両の車輪の転がり軸受に好適な
シール構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal structure for rolling bearings, and more particularly to a seal structure suitable for rolling bearings for vehicle wheels.

【０００２】[0002]

【従来の技術】図５は自動車の車輪のアクスル構造を示
しており、車軸１には二列の内輪（内側軌道部材）２が
嵌め込まれ、該二列の内輪２には転動体としての二列の
ボール３を介してハブ（外側軌道部材）４が外嵌されて
転がり軸受を構成している。ボール３は保持器５によっ
て周方向に略等間隔で転動可能に保持されている。2. Description of the Related Art FIG. 5 shows an axle structure of an automobile wheel, in which two rows of inner rings (inner raceway members) 2 are fitted in an axle 1 and two rows of inner rings 2 serve as rolling elements. A hub (outer race member) 4 is externally fitted via rows of balls 3 to form a rolling bearing. The balls 3 are held by a retainer 5 so as to be rollable in the circumferential direction at substantially equal intervals.

【０００３】ところで、車体と路面の間には、サスペン
ション、車軸、転がり軸受、ホイール、タイヤ等が介在
する。転がり軸受は、転動体がスチールの場合、停止状
態では電気を容易に通すが、回転状態では転動体と軌道
面との間にグリスなどの油膜が形成される為、高い電気
抵抗を有する。この性質のため、走行中、車体と路面と
の間で絶縁状態となって電気抵抗が大きくなり、この電
気抵抗がある程度大きくなると転がり軸受で帯電した静
電気が車体側からタイヤ側へ放電し、該放電による電磁
波ノイズによって車内のラジオにノイズが発生するとい
うおそれがある。By the way, a suspension, an axle, a rolling bearing, a wheel, a tire and the like are interposed between the vehicle body and the road surface. When the rolling element is steel, the rolling bearing easily conducts electricity in the stopped state, but in the rotating state, an oil film such as grease is formed between the rolling element and the raceway surface, and thus has high electric resistance. Due to this property, during running, the vehicle body and the road surface become insulated from each other and the electric resistance increases, and when the electric resistance increases to a certain extent, static electricity charged in the rolling bearing is discharged from the vehicle body side to the tire side. There is a risk that electromagnetic noise from the discharge may cause noise on the radio in the car.

【０００４】このような事情から、転がり軸受の車軸１
の基端部側開口には、内輪２とハブ４との間をシールす
るとともに、内輪２とハブ４との間を電気的に導通させ
て帯電しようとする電荷を流す導電性シール部材が装着
されており、従来のこの種の導電性シール部材として
は、例えば図６および図７に示すものが知られている。
図６に示す導電性シール部材Ｓ１は、内輪２に外嵌され
た断面略Ｌ字状の金属製環状プレート６に電気的導通可
能なゴムシール７を接着剤等により一体に固着して該ゴ
ムシール７に３個のシールリップ部７ａ，７ｂ，７ｃを
設けたものであり、３個のシールリップ部７ａ，７ｂ，
７ｃはハブ４に内嵌された断面略Ｌ字状の金属製環状プ
レート８に線接触するようになっている。Under these circumstances, the rolling bearing axle 1
A conductive seal member that seals between the inner ring 2 and the hub 4 and electrically conducts between the inner ring 2 and the hub 4 to flow an electric charge to be charged is attached to the opening on the base end side of the. As such a conventional conductive seal member of this type, those shown in FIGS. 6 and 7 are known.
In the conductive seal member S1 shown in FIG. 6, a rubber seal 7 which is electrically conductive is integrally fixed to an annular metal plate 6 having a substantially L-shaped cross section fitted on the inner ring 2 by an adhesive agent or the like. Is provided with three seal lip parts 7a, 7b, 7c, and three seal lip parts 7a, 7b,
7c is adapted to come into line contact with a metal annular plate 8 which is fitted in the hub 4 and has a substantially L-shaped cross section.

【０００５】一方、図７に示す導電性シール部材Ｓ２
は、特開平５−２７８４０６号公報に開示されたもの
で、電気抵抗の非常に小さい環状の心金９に導電性接着
剤１０を介して電気的導通可能なゴムシール１１を一体
に固着して該ゴムシール１１のシールリップ部１２を内
輪２に線接触させるようにしたものである。On the other hand, the conductive seal member S2 shown in FIG.
Is disclosed in Japanese Unexamined Patent Publication (Kokai) No. 5-278406, in which an electrically conductive rubber seal 11 is integrally fixed to an annular mandrel 9 having a very low electric resistance via a conductive adhesive 10. The seal lip portion 12 of the rubber seal 11 is brought into line contact with the inner ring 2.

【０００６】[0006]

【発明が解決しようとする課題】しかしながら、上記従
来の各導電性シール部材においては、いずれも転がり軸
受内の防水、グリスの密封等を目的とすることから、必
要な面圧を確保すべくシールリップ部の先端の断面形状
をエッジ状として相手側部材に線接触させるようにして
いるので、シールリップ部を電気的に導通可能な材質に
しても接触面積が小さいため十分な通電性を確保するこ
とができないという問題がある。However, in each of the above-mentioned conventional conductive seal members, since the purpose is to waterproof the inside of the rolling bearing, seal the grease, etc., it is necessary to seal in order to secure a necessary surface pressure. Since the cross-sectional shape of the tip of the lip portion is made edge-shaped so as to be in line contact with the mating member, the contact area is small even if the seal lip portion is made of an electrically conductive material, so sufficient electrical conductivity is ensured. There is a problem that you can not.

【０００７】この場合、単純にシールリップ部の接触面
積を大きくして通電性を確保することが考えられるが、
このようにすると、径方向の剛性が高くなりすぎて径方
向の軸ズレに対する追従性が悪化し、フリクションが大
きくなって燃費の悪化につながるおそれがある。また、
剛性が高くなりすぎないように断面に中空部を有した接
触面積の大きいシールリップ部の形状も考えられるが、
円周形状のシールにおいて中空部を製造することは困難
である。In this case, it is conceivable to simply increase the contact area of the seal lip portion to secure the electric conductivity.
In this case, the rigidity in the radial direction becomes too high, the followability to the axial misalignment in the radial direction deteriorates, and the friction increases, which may lead to deterioration in fuel consumption. Also,
The shape of the seal lip with a large contact area with a hollow section so that the rigidity does not become too high is also conceivable,
It is difficult to manufacture a hollow part in a circumferential seal.

【０００８】本発明はこのような不都合を解消するため
になされたものであり、内側軌道部材と外側軌道部材と
の間のシールを良好なものとすることができると共に、
転がり軸受の通電性を高めることができる転がり軸受の
シール構造を提供することを目的とする。The present invention has been made in order to eliminate such inconvenience, and the seal between the inner race member and the outer race member can be made good, and at the same time,
An object of the present invention is to provide a sealing structure for a rolling bearing, which can improve the electrical conductivity of the rolling bearing.

【０００９】[0009]

【課題を解決するための手段】上記目的を達成するため
に、請求項１に係る発明は、内側軌道部材と外側軌道部
材との間に複数の転動体が配設されると共に、軸方向の
端部にシール部材が装着された転がり軸受のシール構造
であって、前記シール部材は、前記内側軌道部材と前記
外側軌道部材との間の気密性を確保する第１のシールリ
ップ部と、前記内側軌道部材と前記外側軌道部材とを電
気的に導通可能な材質で形成され、前記第１のシールリ
ップ部より摺接側の軌道部材側への接触面積が大きい第
２のシールリップ部と、該第２のシールリップ部を摺接
側の軌道部材側へ押しつけて支持する第３のシールリッ
プ部とを備えたことを特徴とする。In order to achieve the above object, the invention according to claim 1 is such that a plurality of rolling elements are arranged between an inner race member and an outer race member, and at the same time, in the axial direction. A seal structure for a rolling bearing having a seal member attached to an end thereof, wherein the seal member includes a first seal lip portion for ensuring airtightness between the inner race member and the outer race member, and A second seal lip portion formed of a material capable of electrically conducting the inner race member and the outer race member, and having a larger contact area on the race member side on the sliding contact side than the first seal lip portion; And a third seal lip portion for supporting the second seal lip portion by pressing the second seal lip portion toward the track member on the sliding contact side.

【００１０】請求項２に係る発明は、請求項１におい
て、前記第２のシールリップ部と前記第３のシールリッ
プ部との接触面形状を周方向の接触力を高める形状とし
たことを特徴とする。請求項３に係る発明は、請求項２
において、前記前記第２のシールリップ部の前記第３の
シールリップ部への接触面形状を凹凸形状とし、該凹凸
形状を前記接触力を高める形状としたことを特徴とす
る。According to a second aspect of the present invention, in the first aspect, the contact surface shape between the second seal lip portion and the third seal lip portion is a shape that enhances the contact force in the circumferential direction. And The invention according to claim 3 is the claim 2
In the third aspect, the contact surface shape of the second seal lip portion with the third seal lip portion has an uneven shape, and the uneven shape has a shape that enhances the contact force.

【００１１】請求項４に係る発明は、請求項１〜３のい
ずれか一項において、前記第１のシールリップ部、前記
第２のシールリップ部および前記第３のシールリップ部
を電気的導通可能な材質で一体に形成したことを特徴と
する。請求項５に係る発明は、請求項１〜４のいずれか
一項において、前記転がり軸受が車両の車輪を回転可能
に支持する車両用転がり軸受であることを特徴とする。According to a fourth aspect of the present invention, in any one of the first to third aspects, the first seal lip portion, the second seal lip portion, and the third seal lip portion are electrically connected. It is characterized by being integrally formed of a possible material. According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the rolling bearing is a vehicle rolling bearing that rotatably supports a vehicle wheel.

【００１２】[0012]

【発明の効果】請求項１の発明によれば、第１のシール
リップ部によって内側軌道部材と外側軌道部材との間の
シールを良好なものとすることができると共に、電気的
に導通可能な材質で形成された第２のシールリップ部が
摺接側の軌道部材に広い面積で面接触するため、転がり
軸受の電気抵抗を大幅に低減させることが可能になって
十分な通電性を確保することができるという効果が得ら
れる。According to the first aspect of the present invention, the first seal lip portion can provide a good seal between the inner race member and the outer race member, and can be electrically conducted. Since the second seal lip portion made of a material comes into surface contact with the raceway member on the sliding contact side over a wide area, it is possible to significantly reduce the electric resistance of the rolling bearing and ensure sufficient electric conductivity. The effect that can be obtained is obtained.

【００１３】また、面接触状態の第２のシールリップ部
に第３のシールリップ部が該第２のシールリップ部を摺
接側の軌道部材に押しつけるように接触するため、径方
向の剛性を低くした状態で第２のリップシールと第３の
リップシールとの接触力によって周方向の剛性を確保す
ることができ、この結果、径方向の軸ずれに対する第２
のシールリップ部の追従性を確保することができると共
に、第２のシールリップ部とフランジ部との間のフリク
ションの増大を防止することができ、更には、周方向の
剛性を確保できることから、リップスティックによる異
音の発生を防止することができるという効果が得られ
る。Further, since the third seal lip portion comes into contact with the second seal lip portion in the surface contact state so as to press the second seal lip portion against the track member on the sliding contact side, the radial rigidity is improved. The rigidity in the circumferential direction can be secured by the contact force between the second lip seal and the third lip seal in the lowered state, and as a result, the second rigidity against the radial axial deviation can be secured.
Since it is possible to ensure the followability of the seal lip portion, it is possible to prevent an increase in friction between the second seal lip portion and the flange portion, and further, it is possible to secure rigidity in the circumferential direction, The effect that it is possible to prevent the generation of abnormal noise due to the lipstick is obtained.

【００１４】請求項２又は３の発明では、請求項１の発
明に加えて、第２のシールリップ部と第３のシールリッ
プ部との接触力が更に高くなってリップスティックによ
る異音の発生防止効果を確実なものとすることができる
という効果が得られる。請求項４の発明では、請求項１
〜３のいずれか一項の発明に加えて、シール部材の製作
の容易化を図ることができる。According to the invention of claim 2 or 3, in addition to the invention of claim 1, the contact force between the second seal lip portion and the third seal lip portion is further increased, and abnormal noise is generated by the lip stick. The effect that the prevention effect can be made sure is acquired. In the invention of claim 4, claim 1
In addition to the invention according to any one of items 1 to 3, it is possible to facilitate the production of the seal member.

【００１５】請求項５の発明では、請求項１〜４のいず
れか一項の発明に加えて、走行中に車体と路面との間で
絶縁状態となって転がり軸受に帯電しようとする電荷を
内側軌道部材と外側軌道部材との間で確実に流すことが
できるので、従来のように、車体側からタイヤ側へ放電
してラジオノイズの原因になるのを確実に防止すること
ができるという効果が得られる。According to a fifth aspect of the invention, in addition to the invention of any one of the first to fourth aspects, the electric charge that tends to be charged in the rolling bearing becomes an insulating state between the vehicle body and the road surface during traveling. Since it is possible to reliably flow between the inner race member and the outer race member, it is possible to surely prevent the electric discharge from the vehicle body side to the tire side to cause radio noise as in the conventional case. Is obtained.

【００１６】[0016]

【発明の実施の形態】以下、本発明の実施の形態を図を
参照して説明する。図１は本発明の実施の形態の一例で
ある転がり軸受のシール構造を説明するための断面図、
図２は図１の右側から見た図、図３および図４は本発明
の他の実施の形態を説明するための断面図である。な
お、各実施の形態共に、転がり軸受として自動車の車輪
に用いる車両用転がり軸受を例に採り、また、シール部
材を除いて転がり軸受の基本構造は図５で説明したもの
と同様であるので、シール部材についてのみ説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view for explaining a seal structure of a rolling bearing, which is an example of an embodiment of the present invention,
FIG. 2 is a view seen from the right side of FIG. 1, and FIGS. 3 and 4 are sectional views for explaining another embodiment of the present invention. In each of the embodiments, a rolling bearing for a vehicle used as a rolling bearing for an automobile wheel is taken as an example, and the basic structure of the rolling bearing is the same as that described in FIG. 5 except for the seal member. Only the seal member will be described.

【００１７】図１および図２に示すシール部材は、内輪
（内側軌道部材：固定側）２に外嵌された金属製環状プ
レート６に電気的導通可能な材質で一体成形されたゴム
シール７０が接着剤等により一体に固着されている。金
属製環状プレート６は円筒状に形成されて内輪２に外嵌
される円筒部６ａと、該円筒部６ａの軸受内部側の端部
から径方向外方に延びるフランジ部６ｂとを備えてお
り、ゴムシール７０は、円筒部６ａの外周面の軸受内部
側の面、フランジ部６ｂの軸受内部から離反する側の面
およびフランジ部６ｂの先端の軸受内部側の面に連続し
て接着されている。In the seal member shown in FIGS. 1 and 2, a rubber seal 70 integrally formed of an electrically conductive material is adhered to a metal annular plate 6 fitted onto an inner ring (inner race member: fixed side) 2. It is fixed integrally with a chemical agent. The metal annular plate 6 is provided with a cylindrical portion 6a which is formed in a cylindrical shape and is fitted onto the inner ring 2 and a flange portion 6b which extends radially outward from an end portion of the cylindrical portion 6a on the bearing inner side. The rubber seal 70 is continuously adhered to the outer peripheral surface of the cylindrical portion 6a, the surface on the inner side of the bearing, the surface of the flange portion 6b away from the inner portion of the bearing, and the surface of the end of the flange portion 6b on the inner side of the bearing. .

【００１８】ゴムシール７０のフランジ部６ｂの軸受内
部から離反する側には、径方向内方に向けて傾斜する第
１のシールリップ部７１が延設されると共に、径方向外
方に向けて傾斜する第１のシールリップ部７２が延設さ
れている。また、ゴムシール７０のフランジ部６ｂの先
端側には第２のシールリップ部７３が第１のシールリッ
プ部７１と反対方向に略平行に延設され（図１の二点鎖
線参照）、第２のシールリップ部７３の径方向内方には
該第２のシールリップ部７３より短い第３のシールリッ
プ部７４が第２のシールリップ部７３と同一方向に略平
行に延設されている。更に、第２のシールリップ部７３
の第３のシールリップ部７４側を向く面は、図２に示す
ように、周方向に沿って凹凸形状とされている。On the side of the flange portion 6b of the rubber seal 70 away from the inside of the bearing, a first seal lip portion 71 that inclines inward in the radial direction is extended and inclines outward in the radial direction. The first seal lip portion 72 is extended. In addition, a second seal lip portion 73 is provided on the tip end side of the flange portion 6b of the rubber seal 70 so as to extend substantially parallel to the opposite direction of the first seal lip portion 71 (see the chain double-dashed line in FIG. 1). A third seal lip portion 74, which is shorter than the second seal lip portion 73, is provided radially inward of the seal lip portion 73 in the same direction as the second seal lip portion 73 in a substantially parallel manner. Further, the second seal lip portion 73
The surface facing the third seal lip portion 74 side has an uneven shape along the circumferential direction, as shown in FIG.

【００１９】上記第１のシールリップ部７１，７２およ
び第２のシールリップ部７３はハブ（外側軌道部材：摺
接側）４に内嵌された金属製環状プレート８に接触する
ようになっている。金属製環状プレート８は円筒状に形
成されてハブ４に内嵌される円筒部８ａと、該円筒部８
ａの軸受内部から離反する側の端部から径方向内方に延
びるフランジ部８ｂとを備えており、円筒部８ａは金属
製環状プレート６の円筒部６ａに径方向に対向配置さ
れ、フランジ部８ｂは金属製環状プレート６のフランジ
部６ｂに軸方向に対向配置されている。The first seal lip portions 71, 72 and the second seal lip portion 73 come into contact with the metal annular plate 8 fitted in the hub (outer race member: sliding contact side) 4. There is. The metal annular plate 8 is formed in a cylindrical shape, and has a cylindrical portion 8a fitted in the hub 4 and the cylindrical portion 8a.
and a flange portion 8b extending inward in the radial direction from the end of the side a away from the inside of the bearing. The cylindrical portion 8a is arranged to face the cylindrical portion 6a of the metal annular plate 6 in the radial direction. 8b is arranged to face the flange portion 6b of the metal annular plate 6 in the axial direction.

【００２０】そして、ゴムシール７０の第１のシールリ
ップ部７１の先端がフランジ部８ｂに線接触すると共
に、第１のシールリップ部７２の先端が円筒部８ａの内
周面に線接触し、且つ、第２のシールリップ部７３が径
方向内方に弾性的に屈曲された状態で円筒部８ａの内周
面に広い面積で面接触し、該面接触状態の第２のシール
リップ部７３に第３のシールリップ部７４の先端が該第
２のシールリップ部７３を径方向外方、即ち円筒部８ａ
側に弾性的に押しつけるように接触している。The tip of the first seal lip portion 71 of the rubber seal 70 makes line contact with the flange portion 8b, and the tip of the first seal lip portion 72 makes line contact with the inner peripheral surface of the cylindrical portion 8a, and , In a state where the second seal lip portion 73 is elastically bent inward in the radial direction, makes a large area surface contact with the inner peripheral surface of the cylindrical portion 8a, and the second seal lip portion 73 in the surface contact state The tip of the third seal lip portion 74 is radially outward of the second seal lip portion 73, that is, the cylindrical portion 8a.
It is in contact so as to press it elastically to the side.

【００２１】これにより、第２のシールリップ部７３よ
り軸受外部側で第１のシールリップ部７１，７２がフラ
ンジ部８ｂおよび円筒部８ａの内周面に高い面圧で線接
触して軸受内の防水、グリスの密封等を目的とするシー
ル機能が良好に確保されると共に、金属製環状プレート
６、第２のシールリップ部７３および金属製環状プレー
ト８を介して内輪２とハブ４との間が電気的に導通され
るようになっている。As a result, the first seal lip portions 71, 72 are line-contacted to the inner peripheral surfaces of the flange portion 8b and the cylindrical portion 8a with a high surface pressure on the outer side of the bearing than the second seal lip portion 73, and the inside of the bearing. The sealing function for the purpose of waterproofing, sealing grease, etc. is favorably secured, and the inner ring 2 and the hub 4 are connected to each other through the metal annular plate 6, the second seal lip portion 73 and the metal annular plate 8. The spaces are electrically connected.

【００２２】このようにこの実施の形態では、電気的に
導通可能な材質で形成されたゴムシール７０の第２のシ
ールリップ部７３が摺接側の軌道部材であるハブ４に金
属製環状プレート８の円筒部８ａを介して広い面積で面
接触するため、転がり軸受の電気抵抗を大幅に低減させ
ることが可能になって十分な通電性を確保することがで
きる。従って、走行中に車体と路面との間で絶縁状態と
なって転がり軸受に帯電しようとする電荷を内輪２とハ
ブ４との間で確実に流すことができ、この結果、従来の
ように、車体側からタイヤ側へ放電してラジオノイズの
原因になるのを確実に防止することができる。As described above, in this embodiment, the second seal lip portion 73 of the rubber seal 70 formed of an electrically conductive material is attached to the hub 4, which is the track member on the sliding contact side, and the metal annular plate 8 is provided. Since surface contact is made over a wide area via the cylindrical portion 8a, it is possible to significantly reduce the electrical resistance of the rolling bearing, and it is possible to secure sufficient electrical conductivity. Therefore, during traveling, the vehicle body and the road surface are insulated from each other, and the electric charge that tends to be charged in the rolling bearing can be surely flowed between the inner ring 2 and the hub 4. As a result, as in the conventional case, It is possible to reliably prevent discharge from the vehicle body side to the tire side and cause radio noise.

【００２３】また、面接触状態の第２のシールリップ部
７３に第３のシールリップ部７４の先端が該第２のシー
ルリップ部７３を円筒部８ａ側に弾性的に押しつけるよ
うに接触しているため、径方向の剛性を低くした状態で
第２のリップシール７３と第３のリップシール７４との
接触力によって周方向の剛性を確保することができ、こ
の結果、径方向の軸ずれに対する第２のシールリップ部
７３の追従性を確保することができると共に、第２のシ
ールリップ部７３とフランジ部８ａとの間のフリクショ
ンの増大を防止することができ、更には、周方向の剛性
を確保できることから、リップスティックによる異音の
発生を防止することができる。Further, the tip of the third seal lip portion 74 comes into contact with the second seal lip portion 73 in the surface contact state so as to elastically press the second seal lip portion 73 toward the cylindrical portion 8a. Therefore, the rigidity in the circumferential direction can be ensured by the contact force between the second lip seal 73 and the third lip seal 74 in a state where the rigidity in the radial direction is reduced, and as a result, the axial deviation in the radial direction can be prevented. The followability of the second seal lip portion 73 can be ensured, the increase in friction between the second seal lip portion 73 and the flange portion 8a can be prevented, and the rigidity in the circumferential direction can be further improved. Therefore, it is possible to prevent the abnormal noise from being generated by the lipstick.

【００２４】更に、第２のシールリップ部７３の第３の
シールリップ部７４側を向く面が周方向に沿って凹凸形
状とされているため、第２のシールリップ部７３と第３
のシールリップ部７４との接触力が更に高くなってリッ
プスティックによる異音の発生防止効果を確実なものと
することができる。更に、第１のシールリップ部７１，
７２、第２のシールリップ部７３および第３のシールリ
ップ部７４を電気的導通可能な材質で一体成形している
ため、ゴムシール７０を容易に製作することができると
共に、該ゴムシール７０の金属製環状プレート６への接
着作業の容易化を図ることができるため、軸受の製作コ
ストの低減を図ることができる。Furthermore, since the surface of the second seal lip portion 73 facing the third seal lip portion 74 side is made uneven along the circumferential direction, the second seal lip portion 73 and the third seal lip portion 73
The contact force with the seal lip portion 74 is further increased, and the effect of preventing abnormal noise from being generated by the lip stick can be ensured. Further, the first seal lip portion 71,
72, the second seal lip portion 73, and the third seal lip portion 74 are integrally formed of a material capable of electrical conduction, the rubber seal 70 can be easily manufactured, and the rubber seal 70 is made of metal. Since the work of adhering to the annular plate 6 can be facilitated, the manufacturing cost of the bearing can be reduced.

【００２５】なお、上記実施の形態では、第２のシール
リップ部７３の第３のシールリップ部７４側を向く面を
周方向に沿って凹凸形状として第２のシールリップ部７
３と第３のシールリップ部７４との接触力を高めるよう
にした場合を例に採ったが、これに限定されず、例えば
第３のシールリップ部７４の第２のシールリップ部７３
側を向く面を周方向に沿って凹凸形状としてもよいし、
第２のシールリップ部７３と第３のシールリップ部７４
とのそれぞれに互いに嵌め合うような凹凸形状を形成し
てもよいし、第２のシールリップ部７３と第３のシール
リップ部７４との接触面の面粗度を粗くして両者の接触
力を高めるようにしてもよい。In the above-described embodiment, the surface of the second seal lip portion 73 facing the third seal lip portion 74 is formed into an uneven shape along the circumferential direction, and the second seal lip portion 7 is formed.
The case where the contact force between the third seal lip portion 74 and the third seal lip portion 74 is increased has been taken as an example, but the present invention is not limited to this and, for example, the second seal lip portion 73 of the third seal lip portion 74.
The surface facing the side may have an uneven shape along the circumferential direction,
Second seal lip portion 73 and third seal lip portion 74
May be formed to have a concavo-convex shape so as to be fitted to each other, or the surface roughness of the contact surface between the second seal lip portion 73 and the third seal lip portion 74 may be made rough so that the contact force between them is increased. May be increased.

【００２６】また、上記実施の形態では、第１のシール
リップ部７１，７２、第２のシールリップ部７３および
第３のシールリップ部７４を電気的導通可能な材質で一
体成形した場合を例に採ったが、必ずしもこのようにす
る必要はなく、例えば図３に示すように、第１のリップ
シール７１，７２を非導電性の材質で成形すると共に、
第２および第３のシールリップ部７３，７４を電気的導
通可能な材質で成形して両者を接着剤を介して一体に固
着するようにしてもよい。In the above embodiment, the case where the first seal lip portions 71, 72, the second seal lip portion 73, and the third seal lip portion 74 are integrally formed of a material capable of electrical conduction is an example. However, the first lip seals 71 and 72 are formed of a non-conductive material as shown in FIG.
The second and third seal lip portions 73 and 74 may be molded of a material that can be electrically conducted, and they may be integrally fixed via an adhesive.

【００２７】更に、上記実施の形態では、第１のシール
リップ部７１，７２を第２，第３のシールリップ部７
３，７４より軸受外部側に配置した場合を例に採った
が、必ずしもこのようにする必要はなく、例えば図４に
示すように、第１のシールリップ部７１，７２の間に第
２，第３のシールリップ部７３，７４を向きを反対に向
けて配置するようにしてもよい。Further, in the above embodiment, the first seal lip portions 71 and 72 are replaced by the second and third seal lip portions 7.
Although the case where it is arranged on the outer side of the bearing from 3, 74 is taken as an example, it is not always necessary to do so, and as shown in FIG. 4, for example, as shown in FIG. You may make it arrange | position the 3rd seal lip parts 73 and 74 so that the direction may be turned to an opposite direction.

【００２８】更に、上記実施の形態では、転動体として
スチール製のものを例に採ったが、これに代えて、セラ
ミック製の転動体を採用してもよい。更に、本発明は上
記各実施の形態に限定されるものではなく、本発明の要
旨を逸脱しない範囲においてシール部材の構造や各シー
ルリップ部の形状等は適宜変更可能なことはいうまでも
ない。Further, in the above embodiment, the rolling element made of steel was taken as an example, but instead of this, a rolling element made of ceramic may be adopted. Further, it is needless to say that the present invention is not limited to the above-described respective embodiments, and the structure of the seal member, the shape of each seal lip portion, etc. can be appropriately changed without departing from the scope of the present invention. .

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の実施の形態の一例である転がり軸受の
シール構造を説明するための断面図である。FIG. 1 is a cross-sectional view for explaining a seal structure for a rolling bearing that is an example of an embodiment of the present invention.

【図２】図１の右側から見た図である。FIG. 2 is a view seen from the right side of FIG.

【図３】本発明の他の実施の形態を説明するための断面
図である。FIG. 3 is a sectional view for explaining another embodiment of the present invention.

【図４】本発明の他の実施の形態を説明するための断面
図である。FIG. 4 is a sectional view for explaining another embodiment of the present invention.

【図５】自動車の車輪のアクスル構造を説明するための
一部を破断した説明図である。FIG. 5 is a partially broken explanatory view for explaining an axle structure of an automobile wheel.

【図６】従来のシール部材を説明するための断面図であ
る。FIG. 6 is a sectional view for explaining a conventional seal member.

【図７】従来のシール部材を説明するための断面図であ
る。FIG. 7 is a cross-sectional view for explaining a conventional seal member.

【符号の説明】[Explanation of symbols]

２…内輪（内側軌道部材） ４…ハブ（外側軌道部材） ３…ボール（転動体） ７１，７２…第１のシールリップ部 ７３…第２のシールリップ部 ７４…第３のシールリップ部 2 ... Inner ring (inner race member) 4 ... Hub (outer race member) 3 ... Ball (rolling element) 71, 72 ... First seal lip portion 73 ... Second seal lip portion 74 ... Third seal lip portion

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】 内側軌道部材と外側軌道部材との間に複
数の転動体が配設されると共に、軸方向の端部にシール
部材が装着された転がり軸受のシール構造であって、 前記シール部材は、前記内側軌道部材と前記外側軌道部
材との間の気密性を確保する第１のシールリップ部と、
前記内側軌道部材と前記外側軌道部材とを電気的に導通
可能な材質で形成され、前記第１のシールリップ部より
摺接側の軌道部材側への接触面積が大きい第２のシール
リップ部と、該第２のシールリップ部を摺接側の軌道部
材側へ押しつけて支持する第３のシールリップ部とを備
えたことを特徴とする転がり軸受のシール構造。1. A seal structure for a rolling bearing, wherein a plurality of rolling elements are arranged between an inner race member and an outer race member, and a seal member is attached to an end portion in an axial direction, the seal structure comprising: The member includes a first seal lip portion that ensures airtightness between the inner race member and the outer race member,
A second seal lip portion formed of a material capable of electrically conducting the inner race member and the outer race member, and having a larger contact area on the race member side on the sliding contact side than the first seal lip portion; And a third seal lip portion for pressing and supporting the second seal lip portion toward the sliding contact side raceway member side. 【請求項２】 前記第２のシールリップ部と前記第３の
シールリップ部との接触面形状を周方向の接触力を高め
る形状としたことを特徴とする請求項１記載の転がり軸
受のシール構造。2. The seal for a rolling bearing according to claim 1, wherein the shape of the contact surface between the second seal lip portion and the third seal lip portion is a shape that enhances the contact force in the circumferential direction. Construction. 【請求項３】 前記前記第２のシールリップ部の前記第
３のシールリップ部への接触面形状を凹凸形状とし、該
凹凸形状を前記接触力を高める形状としたことを特徴と
する請求項２記載の転がり軸受のシール構造。3. The contact surface shape of the second seal lip portion to the third seal lip portion is an uneven shape, and the uneven shape is a shape that enhances the contact force. 2. The seal structure for a rolling bearing according to 2. 【請求項４】 前記第１のシールリップ部、前記第２の
シールリップ部および前記第３のシールリップ部を電気
的導通可能な材質で一体に形成したことを特徴とする請
求項１〜３のいずれか一項に記載の転がり軸受のシール
構造。4. The first seal lip portion, the second seal lip portion, and the third seal lip portion are integrally formed of a material capable of electrical conduction. The seal structure for a rolling bearing according to any one of 1. 【請求項５】 前記転がり軸受が車両の車輪を回転可能
に支持する車両用転がり軸受であることを特徴とする請
求項１〜４のいずれか一項に記載の転がり軸受のシール
構造。5. The seal structure for a rolling bearing according to claim 1, wherein the rolling bearing is a vehicle rolling bearing that rotatably supports a vehicle wheel.
JP2001265127A 2001-08-31 2001-08-31 Seal structure of rolling bearing Pending JP2003074568A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001265127A JP2003074568A (en) 2001-08-31 2001-08-31 Seal structure of rolling bearing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001265127A JP2003074568A (en) 2001-08-31 2001-08-31 Seal structure of rolling bearing

Publications (1)

Publication Number Publication Date
JP2003074568A true JP2003074568A (en) 2003-03-12

Family

ID=19091635

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001265127A Pending JP2003074568A (en) 2001-08-31 2001-08-31 Seal structure of rolling bearing

Country Status (1)

Country Link
JP (1) JP2003074568A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006312970A (en) * 2005-05-09 2006-11-16 Ntn Corp Sealed rolling bearing
US7901141B2 (en) * 2005-02-14 2011-03-08 Nsk Ltd. Hub unit bearing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7901141B2 (en) * 2005-02-14 2011-03-08 Nsk Ltd. Hub unit bearing
JP2006312970A (en) * 2005-05-09 2006-11-16 Ntn Corp Sealed rolling bearing

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