JP2020024034A

JP2020024034A - Seal device

Info

Publication number: JP2020024034A
Application number: JP2019077130A
Authority: JP
Inventors: 健人小山; Taketo Koyama; 大介仲田; Daisuke Nakada
Original assignee: Uchiyama Manufacturing Corp
Current assignee: Uchiyama Manufacturing Corp
Priority date: 2018-07-31
Filing date: 2019-04-15
Publication date: 2020-02-13
Anticipated expiration: 2039-04-15
Also published as: JP7437723B2

Abstract

To provide a seal device capable of optimizing a continuous length of a labyrinth portion, improving a seal function, and elongating a service life.SOLUTION: A seal device 100 seals an axial end portion in an annular bearing space S between an inner ring 5 and an outer ring 2. The seal device includes a slinger member 101 fitted to the inner ring, and a seal member 106 fitted to the outer ring. The seal device includes: a first axial labyrinth portion r1 constituted between a slinger circular portion and the outer ring and/or the seal member; a first radial labyrinth portion r2 constituted between an outer diameter-side slinger cylindrical portion and the outer ring and/or the seal member; and a second axial labyrinth portion r3 constituted between the outer diameter-side slinger cylindrical portion and the outer ring or the seal member. In the second axial labyrinth portion, the first radial labyrinth portion and the first axial labyrinth portion, the continuous length is set to 1.1 times or more and three times or less an axial length d of the seal fitting cylindrical portion, and a clearance width of each labyrinth portion is set to be 1 mm or less.SELECTED DRAWING: Figure 2

Description

本発明は、例えば、自動車等の車輪支持部の軸受装置に用いられる密封装置に関し、さらに詳しくは、相対的に同軸回転可能な外輪と内輪との間の環状の軸受空間における軸方向端部を密封する密封装置に関する。 The present invention relates to, for example, a sealing device used for a bearing device of a wheel support portion of an automobile or the like, and more particularly, to an axial end portion in an annular bearing space between an outer ring and an inner ring that are relatively coaxially rotatable. The present invention relates to a sealing device for sealing.

前記のような密封装置としては、内輪の外周面に嵌合されるスリンガ部材（これと同等の部材も含む）と、外輪の内周面に嵌合される芯金及び該芯金に固着されて前記スリンガに接触するシールリップを有するシール部材とが組み合わさって構成される密封装置が多く用いられている（例えば、特許文献１〜３参照）。このような密封装置は、内輪又は外輪の軸回転に伴うシールリップのスリンガに対する相対摺接（近接）によって、外部からの軸受空間内への泥水等の浸入を阻止し、また、軸受空間内に充填されるグリース等の外部漏出を阻止するよう設計される。
そして、前記各特許文献では、スリンガ部材がコの字状に形成され、これによって、スリンガ部材とシール部材との組み合わせ部で、連続するラビリンス部が形成され、外部から密封装置内への泥水等の浸入が抑制される。 The sealing device as described above includes a slinger member (including a member equivalent thereto) fitted to the outer peripheral surface of the inner race, a core fitted to the inner peripheral surface of the outer race, and a core fixed to the core. Many sealing devices are used in combination with a sealing member having a sealing lip that comes into contact with the slinger (for example, see Patent Documents 1 to 3). Such a sealing device prevents the intrusion of muddy water or the like from the outside into the bearing space by the relative sliding contact (proximity) of the seal lip to the slinger accompanying the shaft rotation of the inner ring or the outer ring. It is designed to prevent external leakage of the grease to be filled.
In each of the above-mentioned patent documents, the slinger member is formed in a U-shape, whereby a continuous labyrinth portion is formed in a combination portion of the slinger member and the seal member, and muddy water or the like from the outside into the sealing device. Is suppressed.

特開２０１５−１５８２２６号公報JP 2015-158226 A 特開２０１５−１８３８０１号公報JP-A-2015-183801 特開２０１７−１３７９７３号公報JP 2017-137973 A

前記のような密封装置の場合、特に、スリンガ部材がコの字状とされることによって、ラビリンス部の連続長さを大きく確保でき、前記泥水等の浸入抑制が効果的になされる。しかし、ラビリンス部の連続長さが長過ぎると、密封装置内に浸入した泥水が外部に排出され難くなり、密封装置の空間部内に滞留することがある。このように密封装置内に泥水等が滞留すると、泥水等に含まれる塵埃等の異物がシールリップとスリンガ部材との摺接部に噛み込み、シールリップの先端部が経時的に摩耗して、シール寿命が短くなることが懸念される。前記特許文献１〜３には、ラビリンス部の連続長さの適正化についての言及がなく、その改良が望まれるところであった。 In the case of the sealing device as described above, in particular, since the slinger member has a U-shape, a large continuous length of the labyrinth portion can be ensured, and the infiltration of the muddy water and the like can be effectively suppressed. However, if the continuous length of the labyrinth portion is too long, the muddy water that has entered the sealing device becomes difficult to be discharged to the outside, and may stay in the space of the sealing device. When muddy water or the like stays in the sealing device in this way, foreign matter such as dust contained in the muddy water or the like bites into the sliding contact portion between the seal lip and the slinger member, and the tip of the seal lip wears over time, There is a concern that the seal life will be shortened. In Patent Documents 1 to 3, there is no mention of optimizing the continuous length of the labyrinth portion, and improvement thereof has been desired.

本発明は、前記実情に鑑みなされたもので、ラビリンス部の連続長さを適正化し、シール機能の向上と長寿命化を図ることができる密封装置を提供することを目的としている。 SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a sealing device capable of optimizing a continuous length of a labyrinth portion and improving a sealing function and extending a life.

本発明に係る密封装置は、相対的に同軸回転する内輪と外輪との間の環状の軸受空間における軸方向端部を密封する密封装置であって、前記内輪に嵌合されるスリンガ部材と、前記外輪に嵌合されるシール部材とを含み、前記スリンガ部材は、内輪の外周面に嵌合されるスリンガ円筒部と、該スリンガ円筒部における前記軸受空間とは反対側の端部から前記外輪の軸方向端面に対向して外径方向に延びるスリンガ円輪部と、該スリンガ円輪部の外径方向端部から前記軸受空間側に延びる外径側スリンガ円筒部とからなり、前記シール部材は、芯金と、該芯金に一体に設けられたシールリップ基部及び当該シールリップ基部から前記スリンガ部材に弾接乃至近接するよう延びるシールリップとからなり、且つ、前記外輪に嵌合されるシール嵌合円筒部と、該シール嵌合円筒部の一端部より内径方向に延びるシール円輪部とを含み、前記スリンガ円輪部とこれに軸方向に対向する前記外輪及び／又は前記シール部材との間に構成された第１の軸方向ラビリンス部と、前記外径側スリンガ円筒部とこれに径方向に対向する前記外輪及び／又は前記シール部材との間に構成された第１の径方向ラビリンス部と、前記外径側スリンガ円筒部とこれに軸方向に対向する前記外輪又は前記シール部材との間に構成された第２の軸方向ラビリンス部とを備え、前記第２の軸方向ラビリンス部、前記第１の径方向ラビリンス部及び前記第１の軸方向ラビリンス部は、この順序で連続すると共に、その連続長さが前記シール嵌合円筒部の軸方向長さの１．１倍以上且つ３倍以下とされ、且つ、各ラビリンス部の隙間幅がいずれも１ｍｍ以下とされていることを特徴とする。 A sealing device according to the present invention is a sealing device for sealing an axial end portion in an annular bearing space between an inner ring and an outer ring that rotate relatively coaxially, and a slinger member fitted to the inner ring, A sealer member fitted to the outer ring, wherein the slinger member includes a slinger cylindrical portion fitted to the outer peripheral surface of the inner ring, and the outer ring formed from an end of the slinger cylindrical portion opposite to the bearing space. A slinger ring portion extending in the outer diameter direction facing the axial end surface of the ring member, and an outer diameter side slinger cylindrical portion extending from the outer diameter end of the slinger ring portion to the bearing space side, wherein the sealing member Consists of a metal core, a seal lip base provided integrally with the metal core, and a seal lip extending from the seal lip base so as to elastically contact or approach the slinger member, and is fitted to the outer race. Seal mating A sleeve portion extending in the radial direction from one end of the seal fitting cylindrical portion, between the slinger ring portion and the outer ring and / or the seal member axially opposed to the slinger ring portion; A first axial labyrinth portion, a first radial labyrinth portion formed between the outer diameter side slinger cylindrical portion and the outer ring and / or the seal member radially opposed thereto. And a second axial labyrinth portion configured between the outer diameter side slinger cylindrical portion and the outer ring or the seal member axially opposed to the cylindrical portion, the second axial labyrinth portion; The first radial labyrinth portion and the first axial labyrinth portion are continuous in this order, and the continuous length is at least 1.1 times the axial length of the seal fitting cylindrical portion and 3 or more. Less than double and each lavirin Gap width parts is characterized in that there is a both 1mm or less.

本発明の密封装置によれば、３個の連続するラビリンス部によって、泥水等の密封装置内への浸入経路が長くなり、密封装置内へ泥水等が浸入することが抑制される。また、３個のラビリンス部の連続長さをシール嵌合円筒部の軸方向長さの１．１倍以上且つ３倍以下としたことにより泥水等の耐浸入性に加えて、一旦密封装置内に浸入した泥水等の排出も適正になされる。これによって、密封装置としてのシール寿命が向上し、これに伴いシールリップの数も減らすことができることから回転トルクを抑えることができる。因みに、ラビリンス部の連続長さがシール嵌合円筒部の軸方向長さの１．１倍未満の場合、泥水等の耐浸入性が低下する傾向となる。また、ラビリンス部の連続長さがシール嵌合円筒部の軸方向長さの３倍を超えると、泥水等の排水性が低下する傾向となる。さらに、各ラビリンス部の隙間幅をいずれも１ｍｍ以下としているので、ラビリンス部による泥水等の浸入阻止がより的確に発揮される。因みに、各ラビリンス部の隙間幅が１ｍｍを超えると、泥水等の耐浸入性が低下する傾向となる。そして、スリンガ部材が複数の折り曲げ箇所を有する形状とされているから、スリンガ部材の剛性が増し、内輪に対する嵌合力を向上させることができる。 According to the sealing device of the present invention, the continuous path of the muddy water into the sealing device is lengthened by the three continuous labyrinth portions, so that muddy water and the like are prevented from entering the sealing device. In addition, by setting the continuous length of the three labyrinths to be 1.1 times or more and 3 times or less the axial length of the seal fitting cylindrical portion, in addition to the penetration resistance to muddy water, etc. The discharge of muddy water and the like that has invaded the river is also properly performed. As a result, the life of the seal as the sealing device is improved, and the number of seal lips can be reduced accordingly, so that the rotational torque can be suppressed. Incidentally, when the continuous length of the labyrinth portion is less than 1.1 times the axial length of the seal fitting cylindrical portion, the penetration resistance to muddy water and the like tends to decrease. Further, when the continuous length of the labyrinth portion exceeds three times the axial length of the seal fitting cylindrical portion, drainage of muddy water and the like tends to decrease. Furthermore, since the gap width of each labyrinth portion is set to 1 mm or less, the infiltration of muddy water or the like by the labyrinth portion is more accurately exhibited. Incidentally, when the gap width of each labyrinth portion exceeds 1 mm, the resistance to intrusion of muddy water and the like tends to decrease. And since a slinger member is made into the shape which has a several bending part, the rigidity of a slinger member increases and the fitting force with respect to an inner ring can be improved.

本発明の密封装置において、前記第１の軸方向ラビリンス部は、前記スリンガ円輪部の前記軸受空間側の面と、前記外輪及び前記シール部材の前記スリンガ円輪部に対向する面とによって構成されるものとしてもよい。
これによれば、第１の軸方向ラビリンス部の長さが大きく確保され、ラビリンス部による前記効果の発揮がより助長される。 In the sealing device according to the aspect of the invention, the first axial labyrinth portion includes a surface of the slinger ring portion on the bearing space side and a surface of the outer ring and the seal member facing the slinger ring portion. It may be done.
According to this, a large length of the first axial labyrinth portion is secured, and the effect of the labyrinth portion is further promoted.

本発明の密封装置において、前記外輪の外周面には前記外径側スリンガ円筒部の軸方向先端面と対向する段差面が設けられ、前記第２の軸方向ラビリンス部は、前記外径側スリンガ円筒部の軸方向先端面と当該外輪の段差面とによって構成されるものとしてもよい。
これによれば、第２の軸方向ラビリンス部と第１の径方向ラビリンス部とが屈曲した経路を形成することになり、ラビリンス部による前記効果の発揮がより顕著となる。 In the sealing device of the present invention, a step surface facing the axial end surface of the outer diameter side slinger cylindrical portion is provided on an outer peripheral surface of the outer ring, and the second axial labyrinth portion is provided with the outer diameter side slinger. It may be configured by the axial end surface of the cylindrical portion and the step surface of the outer ring.
According to this, the second axial labyrinth portion and the first radial labyrinth portion form a curved path, and the effect of the labyrinth portion becomes more remarkable.

本発明の密封装置において、前記シール嵌合円筒部は、前記外輪の内周面に嵌合されるとともに、前記シール嵌合円筒部の前記軸受空間とは反対側の端部から前記外輪の軸方向端面を覆うように外径方向に延びる外径側シール円輪部を有し、前記スリンガ円輪部と当該外径側シール円輪部の軸方向に対向する面との間に前記第１の軸方向ラビリンス部が構成されるものとしてもよい。
これによれば、外輪の軸受空間とは反対側の端面が外径側シール円輪部によって覆われるから、当該端面が泥水等に晒され難く、この部分の発錆が抑制される。 In the sealing device according to the aspect of the invention, the seal fitting cylindrical portion is fitted to an inner peripheral surface of the outer ring, and a shaft of the outer ring extends from an end of the seal fitting cylindrical portion on a side opposite to the bearing space. An outer diameter side sealing ring portion extending in the outer diameter direction so as to cover the end face in the direction, and the first ring between the slinger ring portion and an axially opposed surface of the outer diameter side sealing ring portion. May be configured.
According to this, since the end face of the outer ring opposite to the bearing space is covered by the outer-diameter-side sealing ring portion, the end face is hardly exposed to muddy water and the like, and rusting of this portion is suppressed.

前記の場合、さらに、前記外径側シール円輪部は、その外径側端部から前記軸受空間側に前記外輪の外周面を覆うように延びる外径側シール円筒部と、当該外径側シール円筒部の軸方向先端部から前記外径側スリンガ円筒部の軸方向先端面と対向するよう外径方向に屈曲された屈曲部とを有し、前記外径側スリンガ円筒部の軸方向先端面と当該屈曲部の対向する面との間に前記第２の軸方向ラビリンス部が構成されるものとしてもよい。
これによれば、外輪の外周面が先端部に屈曲部を有する外径側シール円筒部によって覆われているから、外輪の外周面が泥水等に晒され難くなる。また、屈曲部の堰止め作用が相乗してラビリンス部からの密封装置内への泥水等の浸入が効果的に抑制される。加えて、外輪に特に加工を施すことなく、第２の軸方向ラビリンス部を構成することができる。 In the above case, the outer-diameter-side seal annular portion further includes an outer-diameter-side seal cylindrical portion extending from the outer-diameter-side end to the bearing space side so as to cover the outer peripheral surface of the outer ring; A bent portion bent in an outer diameter direction so as to face an axial end surface of the outer diameter side slinger cylindrical portion from an axial end portion of the seal cylindrical portion, and an axial end of the outer diameter side slinger cylindrical portion. The second axial labyrinth portion may be configured between a surface and an opposite surface of the bent portion.
According to this, since the outer peripheral surface of the outer ring is covered with the outer diameter side sealing cylindrical portion having the bent portion at the tip end, the outer peripheral surface of the outer ring is less likely to be exposed to muddy water or the like. In addition, the blocking action of the bent portion is synergistic, so that intrusion of muddy water or the like from the labyrinth portion into the sealing device is effectively suppressed. In addition, the second axial labyrinth portion can be configured without particularly processing the outer race.

本発明の密封装置において、前記シール嵌合円筒部は、前記外輪の外周面に嵌合し、当該シール嵌合円筒部の前記軸受空間側部分には、前記外径側スリンガ円筒部の軸方向先端面と対向するよう外径方向に突出する環状突部を有し、前記外径側スリンガ円筒部の軸方向先端面と当該環状突部の対向する面との間に前記第２の軸方向ラビリンス部が構成されるものとしてもよい。
これによれば、シール嵌合円筒部が外輪の外周面に嵌合されるから、外輪の外周面が泥水等に晒されず、この部分の発錆が抑えられる。また、環状突部の堰止め作用が相乗してラビリンス部からの密封装置内への泥水等の浸入が効果的に抑制される。加えて、外輪に特に加工を施すことなく、第２の軸方向ラビリンス部を構成することができる。 In the sealing device according to the aspect of the invention, the seal fitting cylindrical portion may fit on an outer peripheral surface of the outer ring, and the bearing space side portion of the seal fitting cylindrical portion may include an axial direction of the outer diameter side slinger cylindrical portion. An annular protrusion protruding in the outer diameter direction so as to face the distal end surface, wherein the second axial direction is provided between an axial end surface of the outer diameter side slinger cylindrical portion and an opposed surface of the annular protrusion; The labyrinth portion may be configured.
According to this, since the seal fitting cylindrical portion is fitted to the outer peripheral surface of the outer ring, the outer peripheral surface of the outer ring is not exposed to muddy water or the like, and rusting of this portion is suppressed. In addition, the blocking effect of the annular projections is synergistic, so that intrusion of muddy water or the like from the labyrinth into the sealing device is effectively suppressed. In addition, the second axial labyrinth portion can be configured without particularly processing the outer race.

本発明の密封装置によれば、ラビリンス部の連続長さを適正化し、シール機能の向上と長寿命化を図ることができる。 ADVANTAGE OF THE INVENTION According to the sealing device of this invention, the continuous length of a labyrinth part can be made appropriate, and the improvement of a sealing function and long life can be achieved.

本発明に係る密封装置が適用される軸受装置の一例を示す概略的縦断面図である。It is a schematic longitudinal section showing an example of a bearing device to which the sealing device concerning the present invention is applied. 図１のＸ部の拡大図であって、本発明に係る密封装置の第一の実施形態を示す図である。It is an enlarged view of the X section of FIG. 1, and is a figure which shows 1st embodiment of the sealing device which concerns on this invention. 本発明に係る密封装置の第二の実施形態を示す図２と同様図である。It is a figure like FIG. 2 which shows 2nd embodiment of the sealing device concerning this invention. 本発明に係る密封装置の第三の実施形態を示す図２と同様図である。It is a figure like FIG. 2 which shows 3rd Embodiment of the sealing device concerning this invention.

以下、本発明の実施の形態について、図面に基づいて説明する。図１は、自動車の車輪（不図示）を軸回転可能に支持する軸受装置１を示す。この軸受装置１は、駆動輪用のハブベアリングであって、大略的に、外輪２と、ハブ輪３と、ハブ輪３の車体側に嵌合一体とされる内輪部材４と、外輪２とハブ輪３及び内輪部材４との間に介装される２列の転動体（ボール）６…とを含んで構成される。この例では、ハブ輪３及び内輪部材４が内輪５を構成し、外輪２は、自動車の車体（不図示）に固定される。また、ハブ輪３にはドライブシャフト（不図示）が同軸的にスプライン嵌合され、ドライブシャフトは等速ジョイント（不図示）を介して不図示の駆動源（駆動伝達部）に連結される。ドライブシャフトはナット（不図示）によって、ハブ輪３と一体化され、ハブ輪３のドライブシャフトからの抜脱が防止されている。回転側である内輪５（ハブ輪３及び内輪部材４）は固定側である外輪２に対して、軸Ｌ回りに同軸回転可能とされ、外輪２と、内輪５との間に環状の軸受空間Ｓが形成される。軸受空間Ｓ内には、２列の転動体６…が、リテーナ６ａに保持された状態で、外輪２の軌道輪２ａ、ハブ輪３の軌道輪３ａ及び内輪部材４の軌道輪４ａを転動可能に介装されている。ハブ輪３は、円筒形状のハブ輪本体３０と、ハブ輪本体３０より立上基部３１を介して径方向外側に延出されたハブフランジ３２とを有し、ハブフランジ３２にボルト３３及び不図示のナットによって車輪が取付固定される。本明細書において、軸Ｌ方向に沿って車輪に向く側（図１において右側を向く側）を車輪側、車体に向く側（同左側を向く側）を車体側と言う。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a bearing device 1 that supports a vehicle wheel (not shown) so as to be rotatable about an axis. The bearing device 1 is a hub bearing for a drive wheel, and is generally composed of an outer ring 2, a hub wheel 3, an inner ring member 4 fitted and integrated with the hub wheel 3 on the vehicle body side, and an outer ring 2. And two rows of rolling elements (balls) 6 interposed between the hub wheel 3 and the inner ring member 4. In this example, the hub wheel 3 and the inner wheel member 4 constitute an inner wheel 5, and the outer wheel 2 is fixed to a vehicle body (not shown). A drive shaft (not shown) is spline-fitted coaxially with the hub wheel 3, and the drive shaft is connected to a drive source (drive transmission unit) not shown via a constant velocity joint (not shown). The drive shaft is integrated with the hub wheel 3 by a nut (not shown) to prevent the hub wheel 3 from coming off the drive shaft. The rotating inner ring 5 (the hub wheel 3 and the inner ring member 4) is coaxially rotatable around the axis L with respect to the fixed outer ring 2, and an annular bearing space is formed between the outer ring 2 and the inner ring 5. S is formed. In the bearing space S, two rows of rolling elements 6 roll on the race 2a of the outer race 2, the race 3a of the hub 3 and the race 4a of the inner race 4 while being held by the retainer 6a. It is interposed as possible. The hub wheel 3 has a hub wheel body 30 having a cylindrical shape, and a hub flange 32 extending radially outward from the hub wheel body 30 via a rising base 31. The wheels are mounted and fixed by the nuts shown. In this specification, the side facing the wheel (the side facing the right side in FIG. 1) along the direction of the axis L is called the wheel side, and the side facing the vehicle body (the side facing the left side) is called the vehicle body side.

軸受空間Ｓの軸Ｌ方向に沿った両端部であって、外輪２とハブ輪３との間、及び、外輪２と内輪部材４との間には、密封装置としてのベアリングシール１００，１０が装着され、軸受空間Ｓの軸Ｌ方向に沿った両端部が密封される。これによって、軸受空間Ｓ内への泥水等の浸入や軸受空間Ｓ内に充填される潤滑剤（グリース等）の外部への漏出が防止される。 Bearing seals 100 and 10 as sealing devices are provided at both ends along the axis L direction of the bearing space S and between the outer ring 2 and the hub wheel 3 and between the outer ring 2 and the inner ring member 4. It is mounted, and both ends along the axis L direction of the bearing space S are sealed. This prevents infiltration of muddy water or the like into the bearing space S and leakage of a lubricant (grease or the like) filled in the bearing space S to the outside.

図２は、本発明に係る密封装置の第一の実施形態を示し、本実施形態では、ベアリングシール１０，１００のうち、車輪側のベアリングシール１００に本発明に係る密封装置が適用された例を示している。本実施形態のベアリングシール（密封装置）１００は、ハブ輪３（内輪５）に嵌合されるスリンガ部材１０１と、外輪２の車輪側内周面２ｅに嵌合されるシール部材１０６とを含む。スリンガ部材１０１は、ハブ輪３（ハブ輪本体３０）の外周面３０ａに嵌合されるスリンガ円筒部１０２と、スリンガ円筒部１０２における軸受空間Ｓとは反対側の端部１０２ａからハブ輪３の立上基部３１の形状に対応する湾曲部１０３を経て外輪２の軸方向端面（車輪側端面）２ｆに対向して外径方向に延びるスリンガ円輪部１０４と、スリンガ円輪部１０４の外径方向端部１０４ａから軸受空間Ｓ側に延びる外径側スリンガ円筒部１０５とからなる。シール部材１０６は、外輪２に嵌合されるシール嵌合円筒部１０７と、シール嵌合円筒部１０７の軸受空間Ｓ側の一端部１０７ａより屈折して内径方向に延びるシール円輪部１０８とを含む。さらに、シール部材１０６は、シール嵌合円筒部１０７の軸受空間Ｓとは反対側の端部１０７ｂから外輪２の車輪側端面２ｆを覆うように外径方向に延びる外径側シール円輪部１０９と、外径側シール円輪部１０９の外径側端部１０９ａから外輪２の車輪側外周面２ｇに沿って軸受空間Ｓ側に延びる外径側シール円筒部１１０とを含む。そして、シール部材１０６は、芯金１１１と、芯金１１１に一体に設けられたシールリップ基部１１２及びシールリップ基部１１２からスリンガ部材１０１に弾接乃至近接するよう延びる図例では３個のシールリップ１１３，１１４，１１５とからなる。 FIG. 2 shows a first embodiment of the sealing device according to the present invention. In this embodiment, an example in which the sealing device according to the present invention is applied to the wheel-side bearing seal 100 among the bearing seals 10 and 100. Is shown. The bearing seal (sealing device) 100 of the present embodiment includes a slinger member 101 fitted to the hub wheel 3 (the inner ring 5) and a seal member 106 fitted to the wheel-side inner peripheral surface 2e of the outer ring 2. . The slinger member 101 includes a slinger cylindrical portion 102 fitted to the outer peripheral surface 30a of the hub wheel 3 (the hub wheel main body 30), and an end 102a of the slinger cylindrical portion 102 opposite to the bearing space S. A slinger circular ring portion 104 extending in the outer radial direction facing the axial end surface (wheel-side end surface) 2f of the outer race 2 via the curved portion 103 corresponding to the shape of the rising base portion 31, and an outer diameter of the slinger circular ring portion 104 An outer diameter side slinger cylindrical portion 105 extending from the direction end portion 104a to the bearing space S side. The seal member 106 includes a seal fitting cylindrical portion 107 fitted to the outer ring 2, and a seal ring portion 108 which is bent from the one end 107 a of the seal fitting cylindrical portion 107 on the bearing space S side and extends in the inner diameter direction. Including. Further, the seal member 106 has an outer-diameter-side seal ring portion 109 extending in the outer-diameter direction so as to cover the wheel-side end surface 2f of the outer ring 2 from the end 107b of the seal fitting cylindrical portion 107 on the side opposite to the bearing space S. And an outer-diameter-side seal cylindrical portion 110 extending from the outer-diameter-side end portion 109a of the outer-diameter-side seal ring portion 109 to the bearing space S along the wheel-side outer peripheral surface 2g of the outer ring 2. The seal member 106 includes a core bar 111, a seal lip base 112 provided integrally with the core bar 111, and three seal lips in the illustrated example extending from the seal lip base 112 so as to elastically contact or approach the slinger member 101. 113, 114, and 115.

本実施形態の芯金１１１は、外輪２の車輪側内周面２ｅに嵌合される芯金円筒部１１１１と、芯金円筒部１１１１の軸受空間Ｓ側の端部１１１１ａから屈折部１１１２を経て内径方向に延びる芯金円輪部１１１３と、芯金円筒部１１１１の軸受空間Ｓとは反対側の端部１１１１ｂから、外輪２の車輪側端面２ｆに密接するよう外径側に延びる外径側芯金円輪部１１１４とからなる。シールリップ基部１１２及びシールリップ１１３，１１４，１１５は、前記例と同様にゴム等の弾性部材からなり、芯金１１１とともにインサート成型により一体に形成される。シールリップ１１３，１１４はアキシャルリップであり、その先側部が軸受空間Ｓとは反対側且つ外径方向に向き、スリンガ部材１０１のスリンガ円輪部１０４の軸受空間Ｓ側の面１０４ｂ及び湾曲部１３０の軸受空間Ｓ側の面１０３ａにそれぞれ弾接する。また、シールリップ１１５はラジアルリップであり、その先側部が軸受空間Ｓ側且つ内径方向に向き、スリンガ円筒部１０２の外周面１０２ｂに弾接する。各シールリップ１１３，１１４，１１５の２点鎖線部は弾性変形前の原形を示している。シールリップ基部１１２は、芯金円輪部１１１３における軸受空間Ｓ側の面１１１３ａの一部から芯金円輪部１１１３の内径側端部１１１３ｂを回り込み、軸受空間Ｓとは反対側の面（車体側面）１１１３ｃの全面から芯金円筒部１１１１の内周面１１１１ｃの全面及び外径側芯金円輪部１１１４の車輪側面１１１４ａを覆うように芯金１１１に一体とされている。さらに、シールリップ基部１１２は、外径側芯金円輪部１１１４を覆う部分の外径側端部から外径側芯金円輪部１１１４の外径側端面１１１４ｂを回り込んで軸受空間Ｓ側に外輪２の外周面２ｇを覆うように延びるリップ基部円筒部１１６を有している。本実施形態では、前記外径側シール円筒部１１０は、当該リップ基部円筒部１１６によって構成されている。リップ基部円筒部１１６は、その軸Ｌ方向先端部から外径側に屈折する屈曲部１１７をさらに有している。 The core metal 111 of the present embodiment is formed by fitting the core metal cylindrical portion 1111 fitted to the wheel-side inner peripheral surface 2 e of the outer ring 2 and the end portion 1111 a of the core metal cylindrical portion 1111 on the bearing space S side via the bending portion 1112. An outer diameter side extending from the inner metal ring portion 1113 extending in the inner diameter direction and an end portion 1111b of the core metal cylindrical portion 1111 opposite to the bearing space S to the outer diameter side so as to be in close contact with the wheel side end surface 2f of the outer ring 2. And a metal core ring 1114. The seal lip base 112 and the seal lips 113, 114, 115 are made of an elastic member such as rubber as in the above-described example, and are integrally formed with the core metal 111 by insert molding. The seal lips 113 and 114 are axial lips, and their front ends face the opposite side to the bearing space S and in the outer diameter direction, and the surface 104b and the curved portion of the slinger ring portion 104 of the slinger member 101 on the bearing space S side. 130 are elastically contacted with the surface 103a on the bearing space S side. In addition, the seal lip 115 is a radial lip, and the tip side of the seal lip 115 faces the bearing space S and the inner diameter direction, and elastically contacts the outer peripheral surface 102 b of the slinger cylindrical portion 102. The two-dot chain lines of the seal lips 113, 114, and 115 indicate the original shapes before elastic deformation. The seal lip base 112 wraps around the inner diameter side end portion 1113b of the core metal ring portion 1113 from a part of the surface 1113a on the bearing space S side of the core metal ring portion 1113, and the surface opposite to the bearing space S (the vehicle body). It is integrated with the core metal 111 so as to cover the entire surface of the inner peripheral surface 1111c of the core metal cylindrical portion 1111 and the wheel side surface 1114a of the outer core metal ring portion 1114 from the entire surface of the side surface 1113c. Further, the seal lip base portion 112 extends around the outer diameter side end surface 1114b of the outer diameter side metal core ring portion 1114 from the outer diameter side end portion of the portion covering the outer diameter side metal core ring portion 1114 to form the bearing space S side. And a lip base cylindrical portion 116 extending so as to cover the outer peripheral surface 2g of the outer ring 2. In the present embodiment, the outer diameter side seal cylindrical portion 110 is constituted by the lip base cylindrical portion 116. The lip base cylindrical portion 116 further has a bent portion 117 that bends toward the outer diameter side from the tip in the axis L direction.

本実施形態では、シール嵌合円筒部１０７は、芯金円筒部１１１１とシールリップ基部１１２の芯金円筒部１１１１に一体とされた部分とにより構成され、シール円輪部１０８は、芯金円輪部１１１３とシールリップ基部１１２の芯金円輪部１１１３に一体とされた部分とにより構成される。また、外径側シール円輪部１０９は、外径側芯金円輪部１１１４と、シールリップ基部１１２の外径側芯金円輪部１１１４に一体とされた部分とにより構成される。そして、外径側スリンガ円筒部１０５は、シールリップ基部１１２におけるリップ基部円筒部１１６の外径側に隙間を開けて位置し、外径側スリンガ円筒部１０５の軸方向先端面１０５ａは、前記屈曲部１１７の車輪側面１１７ａに対向するよう位置付けられる。 In the present embodiment, the seal fitting cylindrical portion 107 includes a core metal cylindrical portion 1111 and a portion integrated with the core metal cylindrical portion 1111 of the seal lip base 112, and the seal ring portion 108 includes a core metal circle. It is composed of a ring portion 1113 and a portion integrated with the core metal ring portion 1113 of the seal lip base 112. Further, the outer diameter side seal ring portion 109 is configured by an outer diameter side core metal ring portion 1114 and a portion integrated with the outer diameter side core metal ring portion 1114 of the seal lip base 112. The outer diameter side slinger cylindrical portion 105 is located with a gap on the outer diameter side of the lip base cylindrical portion 116 in the seal lip base 112, and the axial end surface 105a of the outer diameter side slinger cylindrical portion 105 is bent. The portion 117 is positioned so as to face the wheel side surface 117a.

本実施形態において、スリンガ円輪部１０４の軸受空間Ｓ側の面１０４ｂと、シールリップ基部１１２における外径側芯金円輪部１１１４を覆う部分（外径側シール円輪部１０９）との間に第１の軸方向ラビリンスｒ１が構成されている。また、外径側スリンガ円筒部１０５の内周面１０５ｂと、リップ基部円筒部１１６（外径側シール円筒部１１０）の外周面１６ａとの間に第１の径方向ラビリンス部ｒ２が構成されている。さらに、外径側スリンガ円筒部１０５の軸方向先端面１０５ａと、シールリップ基部１１２における屈曲部１１７の車輪側面１１７ａとの間に第２の軸方向ラビリンス部ｒ３が構成されている。第２の軸方向ラビリンス部ｒ３、第１の径方向ラビリンス部ｒ２及び第１の軸方向ラビリンスｒ１は、ベアリングシール１００の外部から内部に向かいこの順序で連続し、２箇所で屈折部を有するように構成されている。 In the present embodiment, between the surface 104b of the slinger ring portion 104 on the bearing space S side and the portion (outer diameter side seal ring portion 109) of the seal lip base 112 covering the outer diameter core metal ring portion 1114. Constitutes a first axial labyrinth r1. Further, a first radial labyrinth portion r2 is formed between the inner peripheral surface 105b of the outer diameter side slinger cylindrical portion 105 and the outer peripheral surface 16a of the lip base cylindrical portion 116 (outer diameter side seal cylindrical portion 110). I have. Further, a second axial labyrinth portion r3 is formed between the axial front end surface 105a of the outer diameter side slinger cylindrical portion 105 and the wheel side surface 117a of the bent portion 117 of the seal lip base 112. The second axial labyrinth portion r3, the first radial labyrinth portion r2, and the first axial labyrinth r1 are continuous in this order from the outside to the inside of the bearing seal 100, and have two bent portions. Is configured.

本実施形態において、第１の軸方向ラビリンス部ｒ１、第１の径方向ラビリンス部ｒ２及び第２の軸方向ラビリンス部ｒ３の隙間幅は、いずれも１ｍｍ以下に設定される。また、第２の軸方向ラビリンス部ｒ３、第１の径方向ラビリンス部ｒ２及び第１の軸方向ラビリンス部ｒ１の連続長さＬｒは、シール嵌合円筒部１０７の軸方向長さｄの１．１倍以上且つ３倍以下に設定される。 In the present embodiment, the gap width of each of the first axial labyrinth portion r1, the first radial labyrinth portion r2, and the second axial labyrinth portion r3 is set to 1 mm or less. Further, the continuous length Lr of the second axial labyrinth portion r3, the first radial labyrinth portion r2, and the first axial labyrinth portion r1 is equal to 1.1 of the axial length d of the seal fitting cylindrical portion 107. It is set to be at least 1 and at most 3 times.

前記のように構成されるベアリングシール１００を備えた軸受装置１において、ドライブシャフト及び内輪５が軸Ｌ回りに回転すると、スリンガ部材１０１も軸Ｌ回りに回転する。この回転に伴い、シールリップ１１３，１１４，１１５の各先側部分が、スリンガ部材０１のそれぞれの弾接部位で相対的に弾性摺接する。この弾性摺接によって、ベアリングシール１００内に浸入した泥水等は、軸受空間Ｓ内にさらに浸入することが阻止される。また、軸受空間Ｓ内に充填されているグリース等の潤滑剤の外部漏出が防止される。 In the bearing device 1 provided with the bearing seal 100 configured as described above, when the drive shaft and the inner ring 5 rotate around the axis L, the slinger member 101 also rotates around the axis L. Along with this rotation, the respective tip portions of the seal lips 113, 114, and 115 relatively elastically contact each other at the respective elastic contact portions of the slinger member 01. By this elastic sliding contact, muddy water or the like that has entered the bearing seal 100 is prevented from further entering the bearing space S. Further, external leakage of a lubricant such as grease filled in the bearing space S is prevented.

そして、本実施形態では、スリンガ部材１０１及びシール部材１０６間に構成される３個の連続するラビリンス部ｒ１，ｒ２，ｒ３によって、泥水等のベアリングシール１００内への浸入経路が長くなり、ベアリングシール１００内へ泥水等が浸入することが抑制される。また、３個のラビリンス部ｒ１，ｒ２，ｒ３の連続長さＬｒをシール嵌合円筒部１０７の軸方向長さｄの１．１倍以上且つ３倍以下としたことにより泥水等の耐浸入性に加えて、一旦ベアリングシール１００内に浸入した泥水等の排出も適正になされる。特に、スリンガ部材１０１の軸回転に伴う、スリンガ部材１０１及びシール部材１０６によって囲まれた空間部分によるポンピング作用によって、ベアリングシール１００内に浸入した泥水等の排出が速やかになされる。この泥水等の排出が速やかになされない場合、前記空間部分に泥水等が滞留し、泥水等に含まれる塵埃がシールリップ１１３，１１４，１１５のスリンガ部材１０１に対する弾性摺接部分に噛み込んで、シールリップ１１３，１１４，１１５の先端部が摩耗する。しかし、泥水等の排出が速やかになされるので、このような摩耗が生じ難く、これによって、ベアリングシール１００としてのシール寿命が向上する。これに伴いシールリップの数も減らすことができ、シールリップによる回転トルクを抑えることができる。因みに、ラビリンス部ｒ１，ｒ２，ｒ３の連続長さＬｒがシール嵌合円筒部１０７の軸方向長さｄの１．１倍未満の場合、泥水等の耐浸入性が低下する傾向となる。また、ラビリンス部ｒ１，ｒ２，ｒ３の連続長さＬｒがシール嵌合円筒部１０７の軸方向長さの３倍を超えると、泥水等の排水性が低下する傾向となる。 In the present embodiment, three continuous labyrinths r1, r2, and r3 formed between the slinger member 101 and the seal member 106 lengthen a path for muddy water or the like to enter the bearing seal 100, and the bearing seal Infiltration of muddy water and the like into the inside 100 is suppressed. Further, the continuous length Lr of the three labyrinth portions r1, r2, and r3 is set to be 1.1 times or more and 3 times or less the axial length d of the seal fitting cylindrical portion 107, so that the infiltration resistance of muddy water or the like is obtained. In addition, the muddy water and the like once entering the bearing seal 100 is properly discharged. Particularly, due to the pumping action of the space surrounded by the slinger member 101 and the seal member 106 accompanying the rotation of the axis of the slinger member 101, muddy water or the like that has entered the bearing seal 100 is quickly discharged. If the muddy water or the like is not quickly discharged, the muddy water or the like stays in the space, and the dust contained in the muddy water or the like bites into the elastic sliding contact portions of the seal lips 113, 114, and 115 with the slinger member 101, The tips of the seal lips 113, 114, 115 are worn. However, since the muddy water and the like are quickly discharged, such abrasion hardly occurs, and the seal life of the bearing seal 100 is improved. Along with this, the number of seal lips can be reduced, and the rotational torque caused by the seal lips can be suppressed. Incidentally, when the continuous length Lr of the labyrinth portions r1, r2, r3 is less than 1.1 times the axial length d of the seal fitting cylindrical portion 107, the penetration resistance to muddy water and the like tends to decrease. Further, when the continuous length Lr of the labyrinth portions r1, r2, r3 exceeds three times the axial length of the seal fitting cylindrical portion 107, drainage of muddy water and the like tends to decrease.

さらに、各ラビリンス部ｒ１，ｒ２，ｒ３の隙間幅をいずれも１ｍｍ以下としているので、ラビリンス部ｒ１，ｒ２，ｒ３による泥水等の浸入阻止がより的確に発揮される。因みに、各ラビリンス部ｒ１，ｒ２，ｒ３の隙間幅が１ｍｍを超えると、泥水等の耐浸入性が低下する傾向となる。加えて、スリンガ部材１１が複数の折り曲げ箇所を有する形状とされているから、スリンガ部材１１の剛性が増し、内輪５に対する嵌合力を向上させることができる。 Furthermore, since the labyrinths r1, r2, and r3 each have a gap width of 1 mm or less, the labyrinths r1, r2, and r3 more effectively prevent infiltration of muddy water and the like. By the way, if the gap width of each labyrinth part r1, r2, r3 exceeds 1 mm, the penetration resistance to muddy water and the like tends to decrease. In addition, since the slinger member 11 has a shape having a plurality of bent portions, the rigidity of the slinger member 11 increases, and the fitting force to the inner ring 5 can be improved.

さらに、外輪２の車輪側外周面２ｇが先端部に屈曲部１１７を有するリップ基部円筒部１１６（外径側シール円筒部１１０）によって覆われているから、外輪２の外周面２ｇが泥水等に晒され難くなる。また、屈曲部１１７の堰止め作用が相乗してラビリンス部ｒ１，ｒ２，ｒ３からのベアリングシール１００内への泥水等の浸入が効果的に抑制される。加えて、芯金１１１におけるベアリングシール１００の外方側に向く面が全てシールリップ基部１１２によって一体に覆われているから、当該面が外部からの泥水等に晒されず、発錆する懸念がない。さらに加えて、外輪２に特に加工を施すことなく、第２の軸方向ラビリンス部ｒ３を構成することができる。 Further, the outer peripheral surface 2g of the outer ring 2 is covered with the lip base cylindrical portion 116 (outer diameter side sealing cylindrical portion 110) having the bent portion 117 at the tip, so that the outer peripheral surface 2g of the outer ring 2 is exposed to muddy water or the like. It becomes hard to be exposed. In addition, the blocking action of the bent portion 117 is synergistic, so that infiltration of muddy water or the like from the labyrinth portions r1, r2, r3 into the bearing seal 100 is effectively suppressed. In addition, since the entire surface of the metal core 111 facing the outer side of the bearing seal 100 is integrally covered by the seal lip base 112, the surface is not exposed to muddy water from the outside, and there is a fear of rusting. Absent. In addition, the second axial labyrinth portion r3 can be configured without particularly processing the outer ring 2.

図３は、本発明に係る密封装置の第二の実施形態を示し、本実施形態も、車輪側のベアリングシール１００に本発明に係る密封装置が適用された例を示している。本実施形態のベアリングシール（密封装置）１００は、ハブ輪３（内輪５）に嵌合されるスリンガ部材１０１と、外輪２の車輪側外周面２ｇに嵌合されるシール部材１０６とを含む。スリンガ部材１０１は、図２の例と同様に構成されるので、図２の例と同様の符号を付し、その構造の説明は割愛する。シール部材１０６は、外輪２の車輪側外周面２ｇに嵌合されるシール嵌合円筒部１０７と、シール嵌合円筒部１０７の軸受空間Ｓとは反対側の一端部１０７ｂより外輪２の車輪側端面２ｆに沿い、軸受空間Ｓ側に屈折して内径方向に延びるシール円輪部１０８とを含む。そして、シール部材１０６は、芯金１１１と、芯金１１１に一体に設けられたシールリップ基部１１２及びシールリップ基部１１２からスリンガ部材１０１に弾接乃至近接するよう延びる３個のシールリップ１１３，１１４，１１５とからなる。 FIG. 3 shows a second embodiment of the sealing device according to the present invention, and this embodiment also shows an example in which the sealing device according to the present invention is applied to the wheel-side bearing seal 100. The bearing seal (sealing device) 100 of the present embodiment includes a slinger member 101 fitted to the hub wheel 3 (the inner ring 5), and a seal member 106 fitted to the wheel-side outer peripheral surface 2g of the outer ring 2. Since the slinger member 101 is configured in the same manner as in the example of FIG. 2, the same reference numerals as those in the example of FIG. 2 are assigned, and the description of the structure is omitted. The seal member 106 has a seal fitting cylindrical portion 107 fitted to the outer peripheral surface 2g of the outer ring 2 on the wheel side, and one end portion 107b of the seal fitting cylindrical portion 107 opposite to the bearing space S on the wheel side of the outer ring 2. Along with the end face 2f, the seal ring portion 108 is bent toward the bearing space S and extends in the inner diameter direction. The seal member 106 includes a metal core 111, a seal lip base 112 provided integrally with the metal core 111, and three seal lips 113 and 114 extending from the seal lip base 112 so as to elastically contact or approach the slinger member 101. , 115.

本実施形態の芯金１１１は、外輪２の車輪側外周面２ｇに嵌合される芯金円筒部１１１１と、芯金円筒部１１１１の軸受空間Ｓとは反対側の端部１１１１ｂから外輪２の車輪側端面２ｆに密接し、軸受空間Ｓ側に斜めに屈折して内径方向に延びる芯金円輪部１１１３とからなる。シールリップ基部１１２及びシールリップ１１３，１１４，１１５は、前記例と同様にゴム等の弾性部材からなり、芯金１１１とともにインサート成型により一体に形成される。シールリップ１１３，１１４，１１５は、その先側部が図２の例と同様の態様でスリンガ部材に弾接する。シールリップ基部１１２は、芯金円輪部１１１３における軸受空間Ｓ側の面１１１３ａの一部から芯金円輪部１１１３の内径側端部１１１３ｂを回り込み、芯金円輪部１１１３における外輪２の車輪側端面２ｆに密接する部分を含む軸受空間Ｓとは反対側の面（車体側面）１１１３ｃの全面を覆い、さらに芯金円筒部１１１１の外周面１１１１ｄ及び軸受空間側端面１１１１ｅを覆うように芯金１１１に一体とされている。シールリップ基部１１２の芯金円筒部１１１１を覆う部分における軸受空間Ｓ側部分には、外径側スリンガ円筒部１０５の軸方向先端面１０５ａに対向するよう外径方向に突出する環状突部１１８を有している。また、シールリップ基部１１２の芯金円筒部１１１１を覆う部分における軸受空間Ｓとは反対側の端部には、車輪側に延びる環状の庇状部１１９が一体に形成されている。 The core metal 111 of the present embodiment includes a core metal cylindrical portion 1111 fitted to the wheel-side outer peripheral surface 2 g of the outer ring 2, and an end 1111 b of the core metal cylindrical portion 1111 opposite to the bearing space S from the outer ring 2. A core metal ring portion 1113 which is in close contact with the wheel side end surface 2f and is obliquely bent toward the bearing space S and extends in the inner diameter direction. The seal lip base 112 and the seal lips 113, 114, 115 are made of an elastic member such as rubber as in the above-described example, and are integrally formed with the core metal 111 by insert molding. The seal lips 113, 114, and 115 have their leading ends elastically contacting the slinger member in the same manner as in the example of FIG. The seal lip base 112 wraps around the inner diameter side end 1113b of the core metal ring 1113 from a part of the surface 1113a on the bearing space S side of the core metal ring 1113, and the wheel of the outer ring 2 in the core metal ring 1113. The metal core covers the entire surface of the surface (side surface of the vehicle body) 1113c opposite to the bearing space S including the portion closely contacting the side end surface 2f, and further covers the outer peripheral surface 1111d of the metal core cylindrical portion 1111 and the bearing space side end surface 1111e. 111. On the bearing space S side portion of the portion of the seal lip base 112 that covers the cored metal cylinder portion 1111, an annular projection 118 that protrudes in the outer diameter direction so as to face the axial front end surface 105 a of the outer diameter side slinger cylinder portion 105. Have. Further, an annular eave-like portion 119 extending toward the wheel side is formed integrally with an end of the portion of the seal lip base 112 that covers the core metal cylinder 1111 on the side opposite to the bearing space S.

本実施形態では、シール嵌合円筒部１０７は、芯金円筒部１１１１とシールリップ基部１１２における芯金円筒部１１１１の外周部を一体に覆う部分によって構成され、シール円輪部１０８は、芯金円輪部１１１３とシールリップ基部１１２の芯金円輪部１１１３に一体とされた部分とにより構成される。また、外径側スリンガ円筒部１０５は、シールリップ基部１１２における芯金円筒部１１１１を覆う部分の外径側に隙間を開けて位置し、外径側スリンガ円筒部１０５の軸方向先端面１０５ａは、前記環状突部１１８の車輪側面１１８ａに対向するよう位置付けられる。 In the present embodiment, the seal fitting cylindrical portion 107 is configured by a portion that integrally covers the outer peripheral portion of the core metal cylindrical portion 1111 in the core metal cylindrical portion 1111 and the seal lip base 112, and the seal circular ring portion 108 includes It is composed of a ring portion 1113 and a portion integrated with the core metal ring portion 1113 of the seal lip base 112. Further, the outer diameter side slinger cylindrical portion 105 is located with a gap on the outer diameter side of a portion of the seal lip base 112 covering the core metal cylindrical portion 1111, and the axial front end surface 105 a of the outer diameter side slinger cylindrical portion 105 is The annular projection 118 is positioned so as to face the wheel side surface 118a.

本実施形態において、スリンガ円輪部１０４の軸受空間Ｓ側の面１０４ｂと、庇状部１１９の車輪側先端部１１９ａとの間に第１の軸方向ラビリンスｒ１が構成されている。また、外径側スリンガ円筒部１０５の内周面１０５ｂと、芯金円筒部１１１１を覆う部分の外周面との間に第１の径方向ラビリンス部ｒ２が構成されている。さらに、外径側スリンガ円筒部１０５の軸方向先端面１０５ａと、シールリップ基部１１２における環状突部１８の車輪側面１１８ａとの間に第２の軸方向ラビリンス部ｒ３が構成されている。第２の軸方向ラビリンス部ｒ３、第１の径方向ラビリンス部ｒ２及び第１の軸方向ラビリンスｒ１は、ベアリングシール１００の外部から内部に向かいこの順序で連続し、２箇所で屈折部を有するように構成されている。 In the present embodiment, a first axial labyrinth r1 is formed between the surface 104b of the slinger circular ring portion 104 on the bearing space S side and the wheel-side tip portion 119a of the eave-shaped portion 119. Further, a first radial labyrinth portion r2 is formed between the inner peripheral surface 105b of the outer diameter side slinger cylindrical portion 105 and the outer peripheral surface of a portion covering the cored metal cylindrical portion 1111. Further, a second axial labyrinth portion r3 is formed between the axial end surface 105a of the outer diameter side slinger cylindrical portion 105 and the wheel side surface 118a of the annular projection 18 in the seal lip base 112. The second axial labyrinth portion r3, the first radial labyrinth portion r2, and the first axial labyrinth r1 are continuous in this order from the outside to the inside of the bearing seal 100, and have two bent portions. Is configured.

本実施形態においても、第１の軸方向ラビリンス部ｒ１、第１の径方向ラビリンス部ｒ２及び第２の軸方向ラビリンス部ｒ３の隙間幅は、いずれも１ｍｍ以下に設定される。また、第２の軸方向ラビリンス部ｒ３、第１の径方向ラビリンス部及び第１の軸方向ラビリンス部ｒ１の連続長さＬｒは、シール嵌合円筒部１０７の軸方向長さｄの１．１倍以上且つ３倍以下に設定される。 Also in the present embodiment, the gap widths of the first axial labyrinth portion r1, the first radial labyrinth portion r2, and the second axial labyrinth portion r3 are all set to 1 mm or less. Further, the continuous length Lr of the second axial labyrinth portion r3, the first radial labyrinth portion and the first axial labyrinth portion r1 is 1.1 times the axial length d of the seal fitting cylindrical portion 107. It is set to be more than twice and less than three times.

本実施形態のように構成されるベアリングシール１００を備えた軸受装置１においても、内輪５の軸Ｌ回りの回転に伴うシールリップ１１３，１１４，１１５の機能が図２の例と同様に発現される。また、スリンガ部材１０１及びシール部材１０６間に構成される３個の連続するラビリンス部ｒ１，ｒ２，ｒ３によっても、図２の例と同様の効果が得られる。 In the bearing device 1 including the bearing seal 100 configured as in the present embodiment, the functions of the seal lips 113, 114, and 115 associated with the rotation of the inner ring 5 around the axis L are expressed in the same manner as in the example of FIG. You. The same effect as in the example of FIG. 2 can be obtained by three continuous labyrinth portions r1, r2, and r3 formed between the slinger member 101 and the seal member 106.

さらに、外輪２の車輪側外周面２ｇが、芯金円筒部１１１１及びシールリップ基部１１２における芯金円筒部１１１１を一体に覆う部分（シール嵌合円筒部１０７）によって覆われているから、泥水等に晒され難くなる。また、シールリップ基部１１２に形成された環状突部１１８の堰止め作用が相乗してラビリンス部ｒ１，ｒ２，ｒ３からのベアリングシール１００内への泥水等の浸入が効果的に抑制される。加えて、芯金１１１におけるベアリングシール１００の外方側に向く面が全てシールリップ基部１１２によって一体に覆われているから、当該面が外部からの泥水等に晒されず、発錆する懸念がない。さらに加えて、図２の例と同様に外輪２に特に加工を施すことなく、第２の軸方向ラビリンス部ｒ３を構成することができる。 Further, since the wheel outer peripheral surface 2g of the outer ring 2 is covered by a portion (the seal fitting cylindrical portion 107) of the core metal cylindrical portion 1111 and the seal lip base 112 that integrally covers the core metal cylindrical portion 1111, muddy water, etc. Less likely to be exposed to In addition, the blocking effect of the annular projection 118 formed on the seal lip base 112 is synergistic, so that infiltration of muddy water or the like into the bearing seal 100 from the labyrinths r1, r2, r3 is effectively suppressed. In addition, since the entire surface of the metal core 111 facing the outer side of the bearing seal 100 is integrally covered by the seal lip base 112, the surface is not exposed to muddy water from the outside, and there is a fear of rusting. Absent. In addition, the second axial labyrinth portion r3 can be configured without particularly processing the outer race 2 as in the example of FIG.

図４は、本発明に係る密封装置の第三の実施形態を示し、本実施形態も、車輪側のベアリングシール１００に本発明に係る密封装置が適用された例を示している。本実施形態のベアリングシール（密封装置）１００は、ハブ輪３（内輪５）に嵌合されるスリンガ部材１０１と、外輪２の車輪側内周面２ｅに嵌合されるシール部材１０６とを含む。スリンガ部材１０１は、図２の例と同様に構成されるので、図２の例と同様の符号を付し、ここでもその構造の説明は割愛する。シール部材１０６は、外輪２に嵌合されるシール嵌合円筒部１０７と、シール嵌合円筒部１０７の軸受空間Ｓ側の一端部１０７ａより屈折して内径方向に延びるシール円輪部１０８とを含む。さらに、シール部材１０６は、シール嵌合円筒部１０７の軸受空間Ｓとは反対側の端部１０７ｂから外輪２の車輪側端面２ｆを覆うように外径方向に延びる外径側シール円輪部１０９とを含む。そして、シール部材１０６は、芯金１１１と、芯金１１１に一体に設けられたシールリップ基部１１２及びシールリップ基部１１２からスリンガ部材１０１に弾接乃至近接するよう延びる３個のシールリップ１１３，１１４，１１５とからなる。 FIG. 4 shows a third embodiment of the sealing device according to the present invention. This embodiment also shows an example in which the sealing device according to the present invention is applied to the wheel-side bearing seal 100. The bearing seal (sealing device) 100 of the present embodiment includes a slinger member 101 fitted to the hub wheel 3 (the inner ring 5) and a seal member 106 fitted to the wheel-side inner peripheral surface 2e of the outer ring 2. . Since the slinger member 101 is configured in the same manner as in the example of FIG. 2, the same reference numerals as those in the example of FIG. 2 are given, and the description of the structure is also omitted here. The seal member 106 includes a seal fitting cylindrical portion 107 fitted to the outer ring 2, and a seal ring portion 108 which is bent from the one end 107 a of the seal fitting cylindrical portion 107 on the bearing space S side and extends in the inner diameter direction. Including. Further, the seal member 106 has an outer-diameter-side seal ring portion 109 extending in the outer-diameter direction so as to cover the wheel-side end surface 2f of the outer ring 2 from the end 107b of the seal fitting cylindrical portion 107 on the side opposite to the bearing space S. And The seal member 106 includes a metal core 111, a seal lip base 112 provided integrally with the metal core 111, and three seal lips 113 and 114 extending from the seal lip base 112 so as to elastically contact or approach the slinger member 101. , 115.

本実施形態の芯金１１１は、外輪２の車輪側内周面２ｅに嵌合される芯金円筒部１１１１と、芯金円筒部１１１１の軸受空間Ｓ側の端部１１１１ａから屈折部１１１２を経て内径方向に延びる芯金円輪部１１１３と、芯金円筒部１１１１の軸受空間Ｓとは反対側の端部１１１１ｂから、外輪２の車輪側端面２ｆに密接するよう外径側に延びる外径側芯金円輪部１１１４とからなる。外径側芯金円輪部１１１４は、図２の例とは若干異なり、外輪２の車輪側端面２ｆの過半部に密接するように構成される。シールリップ基部１１２及びシールリップ１１３，１１４，１１５は、前記例と同様にゴム等の弾性部材からなり、芯金１１１とともにインサート成型により一体に形成される。シールリップ１１３，１１４，１１５は、その先側部が図２の例と同様の態様でスリンガ部材に弾接する。シールリップ基部１１２の芯金１１１における芯金円筒部１１１１及び芯金円輪部１１１３に対する一体化態様は図２の例と同様である。そして、シールリップ基部１１２は、外径側芯金円輪部１１１４では、車輪側面１１１４ａの全面及び外径側端面１１１４ｂを覆うように一体化され、一部が外輪２の外周面２ｇ（小径面部２ｇａ）より外径側に突出することなく外輪２の車輪側端面２ｆに当接するよう構成される。 The core metal 111 of the present embodiment is formed by fitting the core metal cylindrical portion 1111 fitted to the wheel-side inner peripheral surface 2 e of the outer ring 2 and the end portion 1111 a of the core metal cylindrical portion 1111 on the bearing space S side via the bending portion 1112. An outer diameter side extending from the inner metal ring portion 1113 extending in the inner diameter direction and an end portion 1111b of the core metal cylindrical portion 1111 opposite to the bearing space S to the outer diameter side so as to be in close contact with the wheel side end surface 2f of the outer ring 2. And a metal core ring 1114. The outer diameter side core metal ring portion 1114 is slightly different from the example of FIG. 2, and is configured to be in close contact with a majority portion of the wheel side end surface 2 f of the outer ring 2. The seal lip base 112 and the seal lips 113, 114, 115 are made of an elastic member such as rubber as in the above-described example, and are integrally formed with the core metal 111 by insert molding. The seal lips 113, 114, and 115 have their leading ends elastically contacting the slinger member in the same manner as in the example of FIG. The manner in which the seal lip base 112 is integrated with the core metal cylindrical portion 1111 and the core metal ring portion 1113 of the core metal 111 is the same as in the example of FIG. The seal lip base 112 is integrated with the outer-diameter core metal ring portion 1114 so as to cover the entire surface of the wheel side surface 1114a and the outer-diameter end surface 1114b, and a part of the outer periphery 2g (small-diameter surface portion) of the outer ring 2 is provided. 2ga), it is configured to come into contact with the wheel-side end surface 2f of the outer race 2 without protruding to the outer diameter side.

本実施形態では、シール嵌合円筒部１０７は、芯金円筒部１１１１とシールリップ基部１１２の芯金円筒部１１１１に一体とされた部分とにより構成され、シール円輪部１０８は、芯金円輪部１１１３とシールリップ基部１１２の芯金円輪部１１１３に一体とされた部分とにより構成される。また、外径側シール円輪部１０９は、外径側芯金円輪部１１１４と、シールリップ基部１１２の外径側芯金円輪部１１１４に一体とされた部分及び外径側芯金円輪部１１１４より外径側に位置する部分とにより構成される。外輪２の車輪側外周面２ｇは、車輪側の小径面部２ｇａと、車体側の大径面部２ｇｂとにより構成され、小径面部２ｇａと、大径面部２ｇｂとの間に、これらに垂直な段差面２ｇｃが形成され、当該段差面２ｇｃは外径側スリンガ円筒部１０５の軸方向先端面１０５ａに対向するよう位置付けられている。 In the present embodiment, the seal fitting cylindrical portion 107 includes a core metal cylindrical portion 1111 and a portion integrated with the core metal cylindrical portion 1111 of the seal lip base 112, and the seal ring portion 108 includes a core metal circle. It is composed of a ring portion 1113 and a portion integrated with the core metal ring portion 1113 of the seal lip base 112. In addition, the outer-diameter-side seal ring portion 109 includes an outer-diameter-side core metal ring portion 1114, a portion integrated with the outer-diameter-side core metal ring portion 1114 of the seal lip base 112, and an outer-diameter core metal circle. And a portion located on the outer diameter side from the ring portion 1114. The wheel-side outer peripheral surface 2g of the outer race 2 is composed of a wheel-side small-diameter surface portion 2ga and a vehicle-body-side large-diameter surface portion 2gb, and a step surface perpendicular to the small-diameter surface portion 2ga and the large-diameter surface portion 2gb. 2gc is formed, and the step surface 2gc is positioned so as to face the axial end surface 105a of the outer diameter side slinger cylindrical portion 105.

本実施形態において、スリンガ円輪部１０４の軸受空間Ｓ側の面１０４ｂと、シールリップ基部１１２における外径側芯金円輪部１１１４を覆う部分及び外輪２の車輪側端面２ｆに当接する部分（外径側シール円輪部１０９）との間に第１の軸方向ラビリンスｒ１が構成されている。また、外径側スリンガ円筒部１０５の内周面１０５ｂと、外輪２の車輪側外周面２ｇにおける小径面部２ｇａとの間に第１の径方向ラビリンス部ｒ２が構成されている。さらに、外径側スリンガ円筒部１０５の軸方向先端面１０５ａと、外輪２の車輪側外周面２ｇにおける段差面２ｇｃとの間に第２の軸方向ラビリンス部ｒ３が構成されている。第２の軸方向ラビリンス部ｒ３、第１の径方向ラビリンス部ｒ２及び第１の軸方向ラビリンスｒ１は、ベアリングシール１００の外部から内部に向かいこの順序で連続し、２箇所で屈折部を有するように構成されている。 In the present embodiment, the surface 104b of the slinger ring portion 104 on the bearing space S side, the portion of the seal lip base 112 that covers the outer diameter side metal core ring portion 1114, and the portion that abuts on the wheel side end surface 2f of the outer ring 2 ( A first axial labyrinth r1 is formed between the first axial labyrinth r1 and the outer diameter side seal ring portion 109). A first radial labyrinth portion r2 is formed between the inner peripheral surface 105b of the outer diameter side slinger cylindrical portion 105 and the small diameter surface portion 2ga of the outer peripheral surface 2g of the outer ring 2 on the wheel side. Further, a second axial labyrinth portion r3 is formed between the axial front end surface 105a of the outer diameter side slinger cylindrical portion 105 and the step surface 2gc of the outer peripheral surface 2g of the outer ring 2 on the wheel side. The second axial labyrinth portion r3, the first radial labyrinth portion r2, and the first axial labyrinth r1 are continuous in this order from the outside to the inside of the bearing seal 100, and have two bent portions. Is configured.

本実施形態のように構成されるベアリングシール１００を備えた軸受装置１においても、内輪５の軸Ｌ回りの回転に伴うシールリップ１１３，１１４，１１５の機能が図２の例と同様に発現される。また、スリンガ部材１０１及びシール部材１０６間に構成される３個の連続するラビリンス部ｒ１，ｒ２，ｒ３によっても、図２の例と同様の効果が得られる。さらに、芯金１１１におけるベアリングシール１００の外方側に向く面が全てシールリップ基部１１２によって一体に覆われているから、当該面が外部からの泥水等に晒されず、発錆する懸念がない。
その他の構成で、図２の例と共通する部分の作用・効果は図２の例の場合と同様であるのでその説明は割愛する。 In the bearing device 1 including the bearing seal 100 configured as in the present embodiment, the functions of the seal lips 113, 114, and 115 associated with the rotation of the inner ring 5 around the axis L are expressed in the same manner as in the example of FIG. You. The same effect as in the example of FIG. 2 can also be obtained by three continuous labyrinth portions r1, r2, r3 formed between the slinger member 101 and the seal member 106. Further, since the entire surface of the metal core 111 facing the outer side of the bearing seal 100 is integrally covered with the seal lip base 112, the surface is not exposed to muddy water from the outside and there is no fear of rusting. .
In other configurations, the operations and effects of the parts common to the example of FIG. 2 are the same as those of the example of FIG.

なお、各実施形態では、連続する３個のラビリンス部ｒ１，ｒ２，ｒ３を必須の要件としたが、これに連続或いは非連続の別のラビリンス部を追加構成することも可能である。また、各実施形態では、シールリップの数が３個の例について述べたが、これに限らず、密封性、回転トルク等を勘案してその数を適宜設定することができる。さらに、シールリップをスリンガ部材に弾接させた例を示したが近接乃至当接させるようにしてもよい。また、各実施形態では、外輪が固定側、内輪が回転側としたが、これに限らず、外輪が回転側、内輪が固定側であってもよい。また、図２の例等は、車輪側のベアリングシール１００に適用された例を示しているが、車体側のベアリングシール１０に適用してもよい。また図２等の例は、図１に示すハブベアリングに適用しているが、その他の軸受装置にも適用することは可能である。加えて、本発明に係る密封装置は、自動車用の軸受装置に適用される例について述べたが、これに限らず、相対的に同軸回転する外輪と内輪との間の軸受空間に装着される密封装置であれば、他の産業分野の軸受装置にも好ましく適用される。また、自動車用の軸受装置であっても、駆動輪用に限らず従動輪用の軸受装置であってよい。さらにまた、スリンガ部材及びシール部材の形状等も要求される仕様等に応じて適宜変更が可能である。 In each embodiment, three continuous labyrinths r1, r2, and r3 are indispensable requirements, but another continuous or discontinuous labyrinth may be additionally provided. Further, in each embodiment, the example in which the number of the seal lips is three is described. However, the number is not limited thereto, and the number can be appropriately set in consideration of the sealing performance, the rotational torque, and the like. Furthermore, the example in which the seal lip is elastically contacted with the slinger member has been described, but the seal lip may be brought close to or in contact with the slinger member. Further, in each embodiment, the outer ring is the fixed side and the inner ring is the rotating side. However, the present invention is not limited to this, and the outer ring may be the rotating side and the inner ring may be the fixed side. Although the example of FIG. 2 shows an example in which the present invention is applied to the wheel side bearing seal 100, the example may be applied to the vehicle body side bearing seal 10. The example of FIG. 2 and the like is applied to the hub bearing shown in FIG. 1, but can be applied to other bearing devices. In addition, the sealing device according to the present invention has been described as an example applied to a bearing device for an automobile, but is not limited thereto, and is mounted in a bearing space between an outer ring and an inner ring that rotate relatively coaxially. If it is a sealing device, it is preferably applied to bearing devices in other industrial fields. Further, the bearing device for an automobile may be a bearing device for a driven wheel, not limited to a drive wheel. Furthermore, the shapes of the slinger member and the seal member can be appropriately changed according to the required specifications and the like.

２外輪
２ｅ内周面
２ｆ軸方向端面（軸受空間とは反対側の端面）
２ｇ外周面
２ｇｃ段差面
５内輪
３０ａ外周面
１００ベアリングシール（密封装置）
１０１スリンガ部材
１０２スリンガ円筒部
１０２ａ軸受空間とは反対側の端部
１０４スリンガ円輪部
１０４ｂ軸受空間側の面
１０５外径側スリンガ円筒部
１０５ａ軸方向先端面
１０６シール部材
１０７シール嵌合円筒部
１０７ａ軸受空間側の端部（一端部）
１０７ｂ軸受空間とは反対側の端部
１０８シール円輪部
１０９外径側シール円輪部
１０９ａ外径側端部
１１０外径側シール円筒部
１１７屈曲部
１１８環状突部
１１１芯金
１１２シールリップ基部
１１３，１１４，１１５シールリップ
ｒ１第１の軸方向ラビリンス部
ｒ２第１の径方向ラビリンス部
ｒ３第２の軸方向ラビリンス部
ｄラビリンス部の隙間幅
Ｓ軸受空間 2 Outer ring 2e Inner peripheral surface 2f Axial end surface (end surface opposite to bearing space)
2g Outer peripheral surface 2gc Step surface 5 Inner ring 30a Outer peripheral surface 100 Bearing seal (sealing device)
Reference Signs List 101 slinger member 102 slinger cylindrical portion 102a end portion opposite to bearing space 104 slinger ring portion 104b surface on bearing space side 105 outer diameter side slinger cylindrical portion 105a axial front end surface 106 sealing member 107 seal fitting cylindrical portion 107a Bearing space side end (one end)
107b End opposite to bearing space 108 Sealing ring part 109 Outer diameter side sealing ring part 109a Outer diameter side end part 110 Outer diameter side sealing cylinder part 117 Bend part 118 Annular protrusion 111 Core bar 112 Seal lip base 113, 114, 115 Seal lip r1 First axial labyrinth part r2 First radial labyrinth part r3 Second axial labyrinth part d Clearance width of labyrinth part S Bearing space

Claims

A sealing device for sealing an axial end portion in an annular bearing space between an inner ring and an outer ring that rotate relatively coaxially,
Including a slinger member fitted to the inner ring, and a seal member fitted to the outer ring,
The slinger member extends in a radial direction from a slinger cylindrical portion fitted to the outer peripheral surface of the inner ring and an axial end surface of the outer ring from an end of the slinger cylindrical portion opposite to the bearing space. A slinger ring portion and an outer diameter side slinger cylindrical portion extending from the outer diameter end of the slinger ring portion to the bearing space side;
The seal member includes a core metal, a seal lip base provided integrally with the core metal, and a seal lip extending from the seal lip base so as to elastically contact or approach the slinger member, and is fitted to the outer ring. A seal fitting cylindrical portion to be combined, including a seal ring portion extending in the inner diameter direction from one end of the seal fitting cylindrical portion,
A first axial labyrinth portion formed between the slinger ring portion and the outer ring and / or the seal member axially opposed to the slinger ring portion; A first radial labyrinth portion formed between the outer ring and / or the seal member facing the outer ring and the outer ring or the seal member axially opposed to the outer diameter slinger cylindrical portion; And a second axial labyrinth portion configured as
The second axial labyrinth portion, the first radial labyrinth portion, and the first axial labyrinth portion are continuous in this order, and the continuous length is the axial length of the seal fitting cylindrical portion. A sealing width of 1.1 times or more and 3 times or less, and a clearance width of each labyrinth portion is 1 mm or less.

The sealing device according to claim 1,
The first axial labyrinth portion is configured by a surface of the slinger ring portion on the bearing space side, and a surface of the outer ring and the seal member facing the slinger ring portion. Sealing device.

In the sealing device according to claim 1 or claim 2,
An outer peripheral surface of the outer ring is provided with a stepped surface facing an axially distal end surface of the outer diameter side slinger cylindrical portion, and the second axial labyrinth portion is provided with an axially distal end of the outer diameter side slinger cylindrical portion. A sealing device comprising a surface and a step surface of the outer race.

In the sealing device according to claim 1 or claim 3,
The seal fitting cylindrical portion is fitted to the inner peripheral surface of the outer ring, and is formed so as to cover an axial end surface of the outer ring from an end of the seal fitting cylindrical portion on a side opposite to the bearing space. An outer diameter side sealing ring portion extending in a radial direction, wherein the first axial labyrinth portion is formed between the slinger ring portion and an axially opposed surface of the outer diameter side sealing ring portion; Sealing device characterized by being done.

The sealing device according to claim 4,
The outer-diameter-side seal ring portion has an outer-diameter-side seal cylindrical portion extending from the outer-diameter-side end to the bearing space side so as to cover the outer peripheral surface of the outer ring, and an axial direction of the outer-diameter-side seal cylindrical portion. It has a bent portion bent in the outer diameter direction so as to face the axial end surface of the outer diameter side slinger cylindrical portion from the end portion, and the axial end surface of the outer diameter side slinger cylindrical portion and the bent portion. The sealing device, wherein the second axial labyrinth portion is formed between the first and second surfaces.

The sealing device according to claim 1,
The seal fitting cylindrical portion is fitted to the outer peripheral surface of the outer ring, and the seal fitting cylindrical portion is provided with a bearing space side portion that is opposed to an axial front end surface of the outer diameter side slinger cylindrical portion. An annular protrusion that projects in the radial direction, wherein the second axial labyrinth portion is formed between an axial front end surface of the outer diameter side slinger cylindrical portion and an opposite surface of the annular protrusion. A sealing device.