JP5660372B2 - Sealing device - Google Patents

Sealing device Download PDF

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JP5660372B2
JP5660372B2 JP2010232264A JP2010232264A JP5660372B2 JP 5660372 B2 JP5660372 B2 JP 5660372B2 JP 2010232264 A JP2010232264 A JP 2010232264A JP 2010232264 A JP2010232264 A JP 2010232264A JP 5660372 B2 JP5660372 B2 JP 5660372B2
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peripheral surface
lip
cylindrical portion
sealing device
flange
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JP2012087814A (en
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干城 下原
干城 下原
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Nok Corp
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Description

本発明は、例えば泥水等外部（大気側）の環境が厳しい農機、建機等の軸封部に用いられ、外部からの泥水やダストの浸入を防止すると共に、内部シール対象物の漏れを防止する密封装置に関するものである。   The present invention is used, for example, in shaft seals of agricultural machinery, construction machinery, etc., where the environment (atmosphere side) such as muddy water is severe, and prevents intrusion of muddy water and dust from the outside, and also prevents leakage of internal seal objects. The present invention relates to a sealing device.

従来、この種密封装置としては、図３に示す構造のものが知られている。（特許文献１）
すなわち、ハウジング１００と、このハウジング１００を貫通して伸びる回転軸２００との間隙をシールする密封装置であって、ハウジング１００側に保持されたシール部材３００と、回転軸２００側に保持された金属材製のスリーブ部材４００とにより構成されている。 Conventionally, this type of sealing device has a structure shown in FIG. (Patent Document 1)
That is, a sealing device that seals a gap between the housing 100 and the rotary shaft 200 extending through the housing 100, and includes a seal member 300 held on the housing 100 side and a metal held on the rotary shaft 200 side. And a sleeve member 400 made of a material.

そして、スリーブ部材４００は、回転軸２００の外周面に嵌合される内側円筒部４１０と、この内側円筒部４１０の軸方向一端（図上右端）から径方向外側に伸びる鍔部４２０とを備えている。
また、シール部材３００は、ハウジング１００に嵌合される筒状部３１１０と、この筒状部３１１０の軸方向一端から径方向内側伸びる鍔状部３１２０とより成る金属材製の補強環３１０と、鍔状部３１２０に一体成形されたゴム状弾性材製のリップ部３２０とを備えている。 The sleeve member 400 includes an inner cylindrical portion 410 that is fitted to the outer peripheral surface of the rotary shaft 200, and a flange portion 420 that extends radially outward from one axial end (right end in the drawing) of the inner cylindrical portion 410. ing.
Further, the seal member 300 includes a metal-made reinforcing ring 310 including a cylindrical portion 3110 fitted into the housing 100 and a flange-shaped portion 3120 extending radially inward from one axial end of the cylindrical portion 3110. And a lip portion 320 made of a rubber-like elastic material formed integrally with the flange portion 3120.

そして、このリップ部３２０は、内部Ａ側に向かって伸びると共に、内側円筒部４１０の外周面と摺接するメインリップ３２１０と、径方向外側に向かって伸びると共に、鍔部４２０と摺接する端面リップ３２２０とを備えている。
また、鍔部４２０の径方向端部と、筒状部３１１０の内周面との間隙は、狭間隙であるラビリンス間隙Ｘを構成している。 The lip portion 320 extends toward the inside A side, and also has a main lip 3210 that slidably contacts the outer peripheral surface of the inner cylindrical portion 410, and an end surface lip 3220 that extends diametrically outward and slidably contact the flange portion 420. And.
Further, the gap between the radial end portion of the flange portion 420 and the inner peripheral surface of the cylindrical portion 3110 constitutes a labyrinth gap X that is a narrow gap.

しかし、この種密封装置は、泥水等外部（大気側）の環境が厳しい農機、建機等の軸封部に、長期間用いると、外部からの泥水やダストの浸入を許容してしまう問題を惹起した。
そこで、他のシール部材を追加して、耐泥水性を高める試みがなされたが、取付スペースに限界がある為、新たにシール部材を追加することにより、外部からの泥水やダストの浸入を阻止する性能を高めることは困難であった。 However, this type of sealing device, when used for a long time in shaft seals of agricultural machinery, construction machinery, etc., where the environment (atmosphere side) such as muddy water is severe, allows the entry of muddy water and dust from the outside. Evoked.
Therefore, an attempt was made to increase the muddy water resistance by adding another seal member, but since there is a limit to the installation space, the addition of a new seal member prevents the entry of muddy water and dust from the outside. It was difficult to improve the performance.

実開平６−８７７８１号公報Japanese Utility Model Publication No. 6-87781

そこで、本発明が前述の状況に鑑み、限られたスペースにおいて、泥水等外部（大気側）の環境が厳しい農機、建機等の軸封部に、長期間用いたとしても、外部からの泥水やダストの浸入を効果的に阻止出来る密封装置を提供することを目的としている。   Therefore, in view of the above-mentioned situation, the present invention is not limited to muddy water from the outside even if it is used for a long time in a shaft seal part of agricultural machinery, construction machinery, etc., where the environment (atmosphere side) is difficult in a limited space. It is an object to provide a sealing device that can effectively prevent the intrusion of dust and dust.

上記目的を達成するために本発明にあっては、ハウジングと、前記ハウジングを貫通して伸びる回転軸との間隙をシールする密封装置であって、前記ハウジング側に保持されたシール部材と、前記回転軸側に保持された金属材製のスリーブ部材とにより構成され、前記スリーブ部材は、前記回転軸の外周面に嵌合される内側円筒部と、前記内側円筒部の軸方向一端から径方向外側に伸びる鍔部とより成り、前記シール部材は、前記ハウジングに嵌合される筒状部と、前記筒状部の軸方向一端から径方向内側に伸びる鍔状部とより成る金属材製の補強環と、前記鍔状部に一体成形されたゴム状弾性材製のリップ部とより成り、前記リップ部が、内部側に向かって伸びると共に、前記内側円筒部の外周面と摺接するメインリップと、径方向外側に向かって伸びると共に、前記鍔部と摺接する端面リップとより成る密封装置において、
前記スリーブ部材は、前記鍔部の端部より前記筒状部の内周面と間隙を有して、前記鍔状部に向かって伸びる外側円筒部と、前記外側円筒部の外周面から径方向外側であって、外部側に向かって伸びると共に、前記筒状部の内周面と摺接するゴム状弾性材製の第１のダストシールリップ部とを有し、前記リップ部は、径方向外側であって、内部側に向かって伸びると共に、前記外側円筒部内周面と摺接する第２のダストシールリップ部を有することを特徴とする。

In order to achieve the above object, the present invention provides a sealing device for sealing a gap between a housing and a rotary shaft extending through the housing, the sealing member held on the housing side, A sleeve member made of a metal material held on the rotating shaft side, the sleeve member being configured to be fitted in an outer peripheral surface of the rotating shaft, and a radial direction from one axial end of the inner cylindrical portion The seal member is made of a metal material including a cylindrical portion fitted into the housing, and a flange portion extending radially inward from one axial end of the cylindrical portion. A main lip comprising a reinforcing ring and a lip portion made of a rubber-like elastic material formed integrally with the flange-like portion, the lip portion extending toward the inner side and slidably contacting the outer peripheral surface of the inner cylindrical portion And radially outward With extending bought, in a more composed sealing device and the flange portion and the sliding contact end face lip,
The sleeve member has a gap with an inner peripheral surface of the tubular portion from an end portion of the flange portion, and extends radially toward the outer cylindrical portion extending toward the flange portion and the outer peripheral surface of the outer cylindrical portion. A first dust seal lip portion made of a rubber-like elastic material that extends outward and slidably contacts the inner peripheral surface of the cylindrical portion, and the lip portion is radially outward. And having a second dust seal lip portion that extends toward the inner side and slidably contacts the inner peripheral surface of the outer cylindrical portion.

本発明は、以下に記載されるような効果を奏する。
請求項１記載の発明の密封装置によれば、限られたスペースにおいて、泥水等外部（大気側）の環境が厳しい農機、建機等の軸封部に、長期間用いたとしても、外部からの泥水やダストの浸入を効果的に阻止出来る。
また、請求項２記載の発明の密封装置によれば、シール部材とハウジングとの間の嵌合力とシール性を維持しつつ、第１のダストシールリップの取付スペースを確保することが出来る。 The present invention has the following effects.
According to the sealing device of the first aspect of the present invention, even in a limited space, even if it is used for a long time on a shaft sealing part of agricultural machinery, construction machinery, etc., where the environment (atmosphere side) of muddy water is severe, Can effectively prevent the intrusion of muddy water and dust.
According to the sealing device of the second aspect of the present invention, it is possible to secure the mounting space for the first dust seal lip while maintaining the fitting force and the sealing performance between the seal member and the housing.

更に、請求項３記載の発明の密封装置によれば、より確実に外部からの泥水やダストの浸入を阻止出来る。
また、請求項４記載の発明の密封装置によれば、泥水やダストの内側への浸入を効果的に阻止する為、メインリップの損傷を防ぎ、内部シール対象物の漏出を効果的に防止出来る。 Furthermore, according to the sealing device of the invention described in claim 3, it is possible to more reliably prevent the entry of muddy water and dust from the outside.
Moreover, according to the sealing device of the invention described in claim 4, in order to effectively prevent intrusion of muddy water and dust into the inside, it is possible to prevent damage to the main lip and effectively prevent leakage of the internal seal object. .

また、請求項５記載の発明の密封装置によれば、リップ部側への泥水やダストの浸入を効果的に阻止する為、リップ部のシール性能を長期間維持出来る。   Further, according to the sealing device of the invention described in claim 5, since the entry of muddy water and dust into the lip portion side is effectively prevented, the sealing performance of the lip portion can be maintained for a long time.

第１の実施形態に係る密封装置の断面図。Sectional drawing of the sealing device which concerns on 1st Embodiment. 第２の実施形態に係る密封装置の断面図。Sectional drawing of the sealing device which concerns on 2nd Embodiment. 従来技術に係る密封装置の断面図。Sectional drawing of the sealing device which concerns on a prior art.

以下、本発明を実施するための最良の形態について説明する。
図１に基づき発明を実施するための形態について説明する。 Hereinafter, the best mode for carrying out the present invention will be described.
An embodiment for carrying out the invention will be described with reference to FIG.

本発明に係る密封装置は、ハウジング１と、このハウジング１を貫通して伸びる回転軸２との間隙をシールする密封装置である。
そして、この密封装置は、ハウジング１側に保持されたシール部材３と、回転軸２側に保持された金属材製のスリーブ部材４とにより構成されている。 The sealing device according to the present invention is a sealing device that seals a gap between the housing 1 and the rotary shaft 2 extending through the housing 1.
And this sealing device is comprised by the sealing member 3 hold | maintained at the housing 1 side, and the sleeve member 4 made from a metal material hold | maintained at the rotating shaft 2 side.

このスリーブ部材４は、回転軸２の外周面に嵌合される内側円筒部４１と、内側円筒部４１の軸方向一端（図上右端）から径方向外側に伸びる鍔部４２とを備えている。
また、シール部材３は、ハウジング１に嵌合される筒状部３１１と、この筒状部３１１の軸方向一端（図上左端）から径方向内側伸びる鍔状部３１２とより成る金属材製の補強環３１と、鍔状部３１２に一体成形されたゴム状弾性材製のリップ部３２とを備えている。
また、リップ部３２は、内部Ａ側（図上左側）に向かって伸びると共に、内側円筒部４１の外周面と摺接するメインリップ３２１と、径方向外側に向かって伸びると共に、鍔部４２と摺接する端面リップ３２２とを備えている。 The sleeve member 4 includes an inner cylindrical portion 41 fitted to the outer peripheral surface of the rotary shaft 2 and a flange portion 42 extending radially outward from one axial end (the right end in the drawing) of the inner cylindrical portion 41. .
The seal member 3 is made of a metal material including a cylindrical portion 311 fitted into the housing 1 and a flange-shaped portion 312 extending radially inward from one axial end (left end in the figure) of the cylindrical portion 311. A reinforcing ring 31 and a lip portion 32 made of a rubber-like elastic material formed integrally with the flange-like portion 312 are provided.
The lip portion 32 extends toward the inside A side (left side in the drawing), the main lip 321 slidably in contact with the outer peripheral surface of the inner cylindrical portion 41, the lip portion 32 extends toward the radially outer side, and slides with the flange portion 42. And an end face lip 322 in contact therewith.

更に、スリーブ部材４は、鍔部４２の径方向端部（図上上側）より筒状部３１１の内周面と間隙を有して、鍔状部３１２に向かって伸びる外側円筒部４３と、この外側円筒部４３の外周面から径方向外側（図上上側）であって、外部Ｂ側（図上右端）に向かって伸びると共に、筒状部３１１の内周面と摺接するゴム状弾性材製の第１のダストシールリップ部３２３とを有している。   Further, the sleeve member 4 has an outer cylindrical portion 43 extending from the radial end portion (upper side in the drawing) of the flange portion 42 to the inner peripheral surface of the cylindrical portion 311 and extending toward the flange portion 312; A rubber-like elastic material that extends radially outward (upper side in the figure) from the outer peripheral surface of the outer cylindrical part 43 toward the outer B side (right end in the figure) and that is in sliding contact with the inner peripheral surface of the cylindrical part 311 And a first dust seal lip 323 made of a metal.

更に、リップ部３２は、径方向外側であって、内部Ａ側に向かって伸びると共に、外側円筒部４３内周面と摺接する第２のダストシールリップ部３２４を有している。
この様に、限られたスペース（空間）の中に、従来のリップ部に加え、第１のダストシールリップ部３２３及び第２のダストシールリップ部３２４を追加する事が出来た為、泥水等外部（大気側）の環境が厳しい農機、建機等の軸封部に、長期間用いたとしても、外部からの泥水やダストの浸入を効果的に阻止出来る。 Further, the lip portion 32 has a second dust seal lip portion 324 that is radially outward and extends toward the inside A side and is in sliding contact with the inner peripheral surface of the outer cylindrical portion 43.
In this way, in addition to the conventional lip portion, the first dust seal lip portion 323 and the second dust seal lip portion 324 can be added to the limited space (space). Even if used for a long time in shaft seals of agricultural machinery, construction machinery, etc., where the environment on the atmosphere side is severe, it is possible to effectively prevent intrusion of muddy water and dust from the outside.

更に、リップ部３２は、径方向内側であって、外部Ｂ側に向かって伸びる共に、筒状部３１１外周面と摺接する補助リップ３２６、３２７を有している。
この為、この補助リップ３２６、３２７が、泥水やダストの内側への浸入を効果的に阻止する為、メインリップ３２１の損傷を防ぎ、内部シール対象物の漏出を効果的に防止出来る。 Furthermore, the lip portion 32 has auxiliary lips 326 and 327 that are radially inward and extend toward the outer side B and are in sliding contact with the outer peripheral surface of the cylindrical portion 311.
For this reason, since these auxiliary lips 326 and 327 effectively prevent intrusion of muddy water and dust into the inside, it is possible to prevent damage to the main lip 321 and effectively prevent leakage of the internal seal object.

更に、筒状部３１１外周面は、リップ部３２を構成するゴム状弾性材の一部により形成されたゴム嵌合層３１１１と、ゴム状弾性材が存在しない金属嵌合層３１１２とにより形成されている。
この為、この筒状部３１１は、シール部材とハウジングとの間の嵌合力とシール性を維持しつつ、第１のダストシールリップ３２３が形成されている筒状部３１１の領域には、ゴム嵌合層３１１１が存在せず、この領域における筒状部３１１の径方向厚みを、他に比べ薄く出来る為、第１のダストシールリップ３２３の取付スペースを確保することが出来る。 Further, the outer peripheral surface of the cylindrical portion 311 is formed by a rubber fitting layer 3111 formed by a part of the rubber-like elastic material constituting the lip portion 32 and a metal fitting layer 3112 where no rubber-like elastic material exists. ing.
For this reason, the cylindrical portion 311 maintains a fitting force and a sealing property between the sealing member and the housing, and a rubber fitting is provided in the region of the cylindrical portion 311 where the first dust seal lip 323 is formed. Since the composite layer 3111 does not exist and the radial thickness of the cylindrical portion 311 in this region can be made thinner than the others, a mounting space for the first dust seal lip 323 can be secured.

また、外側円筒部４３の軸方向端部外周面と、筒状部３１１内周面との間隙がラビリンス間隙Ｘを形成している。
この為、リップ部３２側への泥水やダストの浸入を効果的に阻止する為、リップ部３２のシール性能を長期間維持出来る。 The gap between the outer peripheral surface in the axial direction of the outer cylindrical portion 43 and the inner peripheral surface of the cylindrical portion 311 forms a labyrinth gap X.
For this reason, the sealing performance of the lip part 32 can be maintained for a long period of time in order to effectively prevent muddy water and dust from entering the lip part 32 side.

また、メインリップ３２１の外周側には、メインリップ３２１を内側円筒部４１の外周面に押圧するガータースプリング３２１１が配置されている。
この事により、メインリップ３２１の良好な緊迫力が、長期間維持出来る。 A garter spring 3211 that presses the main lip 321 against the outer peripheral surface of the inner cylindrical portion 41 is disposed on the outer peripheral side of the main lip 321.
As a result, a good tension of the main lip 321 can be maintained for a long time.

また、内側円筒部４１の内周面には、ゴム状弾性材層が形成されている。
この事により、内側円筒部４１と回転軸２との間の良好なシール性が維持出来る。
また、鍔部４２の外部Ｂ側にも、ゴム状弾性材層が形成されている。
この事により、鍔部４２が、泥水等により腐食される事を防止出来る。 A rubber-like elastic material layer is formed on the inner peripheral surface of the inner cylindrical portion 41.
By this, the favorable sealing performance between the inner cylindrical part 41 and the rotating shaft 2 can be maintained.
A rubber-like elastic material layer is also formed on the outside B side of the collar portion 42.
By this, it can prevent that the collar part 42 is corroded by muddy water etc.

ついで、第２の実施形態に係る密封装置を図２に基づき説明する。
上述した第１の実施形態と相違する点は、筒状部３１１が、筒状部３１１の端部（図上右端）より径方向外側（図上上側）に伸びるフランジ部３１３を備えると共に、スリーブ部材４側から径方向外側に向かって伸びると共に、フランジ部３１３に摺接するゴム状弾性材製の第３のダストシールリップ部３２５を設ける構成とした点である。
この事により、第１の実施形態に比べ、より確実に外部からの泥水やダストの浸入を阻止する密封装置と出来る。 Next, the sealing device according to the second embodiment will be described with reference to FIG.
The difference from the first embodiment described above is that the cylindrical portion 311 includes a flange portion 313 that extends radially outward (upward in the drawing) from the end portion (right end in the drawing) of the cylindrical portion 311, and the sleeve. A third dust seal lip portion 325 made of a rubber-like elastic material that extends radially outward from the member 4 side and slidably contacts the flange portion 313 is provided.
By this, compared with 1st Embodiment, it can be set as the sealing device which prevents intrusion of muddy water and dust from the exterior more reliably.

大気側が泥水等の厳しい条件で使用される耕耘機、建設機械等の軸封部をシールする密封装置として好適に用いられる。   It is suitably used as a sealing device for sealing a shaft seal portion of a tiller, construction machine or the like that is used under severe conditions such as muddy water on the atmosphere side.

また、本発明は上述の発明を実施するための最良の形態に限らず本発明の要旨を逸脱することなくその他種々の構成を採り得ることはもちろんである。   Further, the present invention is not limited to the best mode for carrying out the invention described above, and various other configurations can be adopted without departing from the gist of the present invention.

１ ハウジング
２ 軸
３ シール部材
４ スリーブ部材
３１ 補強環
３２ リップ部
４１ 内側円筒部
４２ 鍔部
４３ 外側円筒部
３１１筒状部
３１２鍔状部
３１３フランジ部
３２１メインリップ
３２２端面リップ
３２３第１のダストリップ
３２４第２のダストリップ
３２５第３のダストリップ
３２６補助リップ
３２７補助リップ DESCRIPTION OF SYMBOLS 1 Housing 2 Shaft 3 Seal member 4 Sleeve member 31 Reinforcement ring 32 Lip part 41 Inner cylindrical part 42 Ridge part 43 Outer cylindrical part 311 Cylindrical part 312 Rigid part 313 Flange part 321 Main lip 322 End face lip 323 First dust lip 324 Second Dustrip 325 Third Dustrip 326 Auxiliary Lip 327 Auxiliary Lip

Claims (5)

ハウジング（１）と、前記ハウジング（１）を貫通して伸びる回転軸（２）との間隙をシールする密封装置であって、前記ハウジング（１）側に保持されたシール部材（３）と、前記回転軸（２）側に保持された金属材製のスリーブ部材（４）とにより構成され、前記スリーブ部材（４）は、前記回転軸（２）の外周面に嵌合される内側円筒部（４１）と、前記内側円筒部（４１）の軸方向一端から径方向外側に伸びる鍔部（４２）とより成り、前記シール部材（３）は、前記ハウジング（１）に嵌合される筒状部（３１１）と、前記筒状部（３１１）の軸方向一端から径方向内側に伸びる鍔状部（３１２）とより成る金属材製の補強環（３１）と、前記鍔状部（３１２）に一体成形されたゴム状弾性材製のリップ部（３２）とより成り、前記リップ部（３２）が、内部（Ａ）側に向かって伸びると共に、前記内側円筒部（４１）の外周面と摺接するメインリップ（３２１）と、径方向外側に向かって伸びると共に、前記鍔部（４２）と摺接する端面リップ（３２２）とより成る密封装置において、
前記スリーブ部材（４）は、前記鍔部（４２）の端部より前記筒状部（３１１）の内周面と間隙を有して、前記鍔状部（３１２）に向かって伸びる外側円筒部（４３）と、前記外側円筒部（４３）の外周面から径方向外側であって、外部（Ｂ）側に向かって伸びると共に、前記筒状部（３１１）の内周面と摺接するゴム状弾性材製の第１のダストシールリップ部（３２３）とを有し、前記リップ部（３２）は、径方向外側であって、内部（Ａ）側に向かって伸びると共に、前記外側円筒部（４３）内周面と摺接する第２のダストシールリップ部（３２４）を有することを特徴とする密封装置。 A sealing device for sealing a gap between a housing (1) and a rotating shaft (2) extending through the housing (1), the sealing member (3) held on the housing (1) side; An inner cylindrical portion that is configured by a metal-made sleeve member (4) held on the rotating shaft (2) side, and the sleeve member (4) is fitted to the outer peripheral surface of the rotating shaft (2). (41) and a flange portion (42) extending radially outward from one axial end of the inner cylindrical portion (41), and the seal member (3) is a cylinder fitted to the housing (1) A reinforcing ring (31) made of a metal material including a ring-shaped portion (311) , a flange-shaped portion (312) extending radially inward from one axial end of the cylindrical portion (311), and the flange-shaped portion (312) ) And a lip portion (32) made of a rubber-like elastic material formed integrally with The lip portion (32) extends toward the inside (A) side, the main lip (321) that is in sliding contact with the outer peripheral surface of the inner cylindrical portion (41), the lip portion (32) extends toward the radially outer side, and the flange portion (42) In the sealing device comprising the end face lip (322) in sliding contact,
The sleeve member (4) has an outer cylindrical portion extending from the end portion of the flange portion (42) toward the flange portion (312) with a gap from the inner peripheral surface of the cylindrical portion (311). (43) and a rubber-like shape that is radially outward from the outer peripheral surface of the outer cylindrical portion (43), extends toward the outer (B) side, and slidably contacts the inner peripheral surface of the cylindrical portion (311). A first dust seal lip portion (323) made of an elastic material, and the lip portion (32) is radially outward and extends toward the inner (A) side, and the outer cylindrical portion (43). ) A sealing device having a second dust seal lip portion (324) in sliding contact with the inner peripheral surface. 前記筒状部（３１１）外周面は、前記リップ部（３２）を構成するゴム状弾性材の一部により形成されたゴム嵌合層（３１１１）と、ゴム状弾性材が存在しない金属嵌合層（３１１２）とにより形成され、前記第１のダストシールリップ部（３２３）が金属嵌合層（３１１２）の内周面に摺接していることを特徴とする請求項１記載の密封装置。   The outer peripheral surface of the cylindrical part (311) has a rubber fitting layer (3111) formed by a part of the rubber-like elastic material constituting the lip part (32) and a metal fitting without the rubber-like elastic material. The sealing device according to claim 1, wherein the first dust seal lip portion (323) is in sliding contact with the inner peripheral surface of the metal fitting layer (3112). 前記筒状部（３１１）は、前記筒状部（３１１）の端部より径方向外側に伸びるフランジ部（３１３）を備えると共に、前記スリーブ部材（４）側から径方向外側に向かって伸びると共に、前記フランジ部（３１３）に摺接するゴム状弾性材製の第３のダストシールリップ部（３２５）を有していることを特徴とする請求項１または２記載の密封装置。   The tubular portion (311) includes a flange portion (313) extending radially outward from an end portion of the tubular portion (311), and extends radially outward from the sleeve member (4) side. The sealing device according to claim 1, further comprising a third dust seal lip portion (325) made of a rubber-like elastic material in sliding contact with the flange portion (313). 前記リップ部（３２）は、径方向内側であって、外部（Ｂ）側に向かって伸びると共に、前記内側円筒部（４１）外周面と摺接する補助リップ（３２６）、（３２７）を有していることを特徴とする請求項１〜３いずれか一項に記載の密封装置。 The lip portion (32) is a radially inner, outer (B) when extending toward the side together, the inner cylindrical portion (41) outer peripheral surface in sliding contact with the auxiliary lip (326), have a (327) The sealing device according to any one of claims 1 to 3, wherein the sealing device is provided. 前記外側円筒部（４３）の軸方向端部外周面と、前記筒状部（３１１）内周面との間隙がラビリンス間隙（Ｘ）を形成していることを特徴とする請求項１〜４いずれか一項に記載の密封装置。   The gap between the outer peripheral surface in the axial direction of the outer cylindrical portion (43) and the inner peripheral surface of the cylindrical portion (311) forms a labyrinth gap (X). The sealing device according to any one of the above.
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