JP4380114B2 - Sealing device and sealing mechanism - Google Patents

Sealing device and sealing mechanism Download PDF

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Publication number
JP4380114B2
JP4380114B2 JP2002178662A JP2002178662A JP4380114B2 JP 4380114 B2 JP4380114 B2 JP 4380114B2 JP 2002178662 A JP2002178662 A JP 2002178662A JP 2002178662 A JP2002178662 A JP 2002178662A JP 4380114 B2 JP4380114 B2 JP 4380114B2
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Prior art keywords
housing
sealing
peripheral surface
cylindrical portion
sealing device
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JP2004019865A (en
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剛 神前
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Nok Corp
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Nok Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、例えば各種装置の軸封部に用いられるオイルシール等の密封装置および該密封装置を備えた密封機構に関するものである。
【0002】
【従来の技術】
従来この種の密封装置および密封機構としては、例えば、図3に示すようなものがある。
【0003】
図3において、密封装置100は、互いに同心的に相対回転自在に組み付けられる2部材としてのハウジング101とそのハウジング101内に挿入される回転軸102に取付けられて大気側Aにフランジ部105aを有するスリーブ部材105間の環状の隙間を密封するものである。
【0004】
そして、この密封装置100は、ハウジング101の内周面に組み付けられる円筒状の嵌め合い部103aと密封流体側Oに径方向内向きの円環部103bとを有する金属環103と、回転軸102に取り付けられたスリーブ部材105のスリーブ部105bの外周面に摺動自在に密封接触し密封流体が大気側に漏れるのを防止するメインリップ104aを有する例えばゴム等の弾性部材104とを備えている。
【0005】
また、弾性部材104には、舌状のダストリップ104bがメインリップ104aと連続して設けられている。このダストリップ104bは大気側Aに延び、径方向外向きに傾き、スリーブ部105のフランジ部105aに摺接するように形成されており、大気側Aからの泥水等が内部に侵入するのを防止している。
【0006】
そして、弾性部材104は金属環103を包むように焼き付け等により金属環に固着されており、金属環103の円筒部103aのハウジングに相対する面にも弾性部材が存在するため、密封装置100とハウジング101の内周面間をもシールしている。
【0007】
しかし、ハウジング101の内周面と軸102に取り付けられたスリーブ部105の外周面との間の隙間が小さい場合は、充分なスペースがないため、図4に示すように、金属環103の円筒部103aのハウジングに相対する面には弾性部材を設けずに金属環103の円筒部103aの外周面をハウジング101の内周面に直接嵌め合わせて使用している。
【0008】
また、ハウジング101の内周面と軸102の外周面との間の隙間が小さい場合でも密封装置とハウジングとの嵌め合い幅が多い場合は、図5に示すように、円筒部103aの大気側の一部に弾性部材を固着し、該弾性部材でハウジング内周面をシールするタイプも存在する。
【0009】
【発明が解決しようとする課題】
しかしながら、上記のような従来技術の場合には、以下のような問題が生じていた。
【0010】
従来のハウジング101の内周面と軸102の外周面との間の隙間が小さい場合に、図4に示すように金属環103の円筒部103aの外周面をハウジング101の内周面に直接嵌め合わせるタイプで、ハウジングの材質がアルミニウムや樹脂等の熱膨張率が大きいものである場合には、温度が上がるのに従いハウジングと密封装置の金属環との隙間大きくなり、嵌め合い部からの密封流体の漏れが生じる可能性もあった。
【0011】
また、図5に示すような円筒部の一部を弾性部材で覆いハウジング101の内周面をシールするものだと、ハウジングの内周面は平面であるため、充分なシール性を確保するためには弾性部材に大きな突起を設ける必要があるが、該密封装置をハウジング101に挿入する際、該突起がハウジングの密封装置の装着部に臨んで開口された開口部の角で傷付けられシール機能を損なってしまうおそれがあった。
【0012】
また、密封装置100とハウジング101との嵌め合い幅が小さい場合は、円筒部とハウジングに充分な接触面積・接触圧を要するために、図5に示すような円筒部103aの大気側の一部に弾性部材を設けることが困難となり、図4に示すように直接金属環の円筒部103aとハウジング内周面とを嵌め合わせなければならず、上記同様密封流体の漏れが生じる可能性があった。
【0013】
本発明は上記の従来技術の課題を解決するためになされたもので、その目的とするところは、スペース的に余裕がない場合においても、密封装置と該密封装置が装着される部材との間に安定したシール性を確保することができる密封装置および該密封装置を備えた密封機構を提供することにある。
【0014】
【課題を解決するための手段】
上記目的を達成するために本発明に係る密封装置にあっては、
互いに同心的に相対回転自在に組み付けられる軸と該軸が挿入される軸孔を有するハウジングとの間の環状の隙間をシールするもので、
前記ハウジングの軸孔の内周面に嵌合される円筒部と該円筒部の密封流体側の端部から内径側に折り曲がった円環部とを有する金属環と、を備え、
前記金属環の円筒部の大気側端部には、円筒部の外周面に対して内径方向にへこむ凹部が設けられるとともに、該凹部を含む領域に弾性部材が焼き付けまたは接着により固着されており、
前記弾性部材の大気側は、前記ハウジングに装着する際に剥がれないようにすべく根本端部が前記金属環の円筒部の外周面にはみ出さず、先端側が前記金属環の円筒部の外周面に対して外側に突出する形状を有し、前記ハウジングの軸孔に設けられた密封装置の装着部に臨んで開口している開口部の拡径するテーパー状の端縁をシールする端縁シール部であることを特徴とする。
【0015】
これにより、2部材間の環状の隙間が小さい場合においても、密封装置と該密封装置が装着される部材との間に安定したシール性を確保することができる。
【0017】
また弾性部材において円筒部の外周面に対して外側に突出した端縁シール部が、密封装置が取付けられる部材の開口部のテーパー状の端縁の形状に追従するので正確に安定したシール性を確保することができる。
【0018】
また、本発明に係る密封機構にあっては、
互いに同心的に相対回転自在に組み付けられる、軸と該軸が挿入される軸孔を有するハウジングと、
該軸と該ハウジングとの間の環状の隙間をシールする密封装置と、
を備えた密封機構において、
軸方向に延びるスリーブ部と該スリーブ部の大気側端部から外径方向に延びるフランジ部とを有するスリーブ部材が前記軸に装着されると共に、
前記ハウジングは、前記密封装置の装着部に臨んで開口している開口部を有し、
前記密封装置は、
前記ハウジングの軸孔の内周面に嵌合される円筒部と該円筒部の密封流体側の端部から内径側に折り曲がった円環部とを有する金属環と、
前記スリーブ部材のスリーブ部の外周面に摺接するメインリップと、
前記スリーブ部材のフランジ部に摺接するダストリップと、を備え、
前記金属環の円筒部の大気側端部には、円筒部の外周面に対して内径方向にへこむ凹部が設けられるとともに、該凹部を含む領域に弾性部材が焼き付けまたは接着により固着されており、
前記弾性部材の大気側は、前記ハウジングに装着する際に剥がれないようにすべく根本端部が前記金属環の円筒部の外周面にはみ出さず、先端側が前記金属環の円筒部の外周面に対して外側に突出する形状を有し、前記ハウジングの軸孔に設けられた密封装置の装着部に臨んで開口している開口部の拡径するテーパー状の端縁をシールする端縁シール部であることを特徴とする。
【0019】
これにより、泥水等大気側のダスト条件が厳しい使用環境下においても、ダストが密封流体側に侵入することを防止することができるとともに、密封装置とハウジングとの間から密封流体が漏れることをも防止することができる密封機構を形成できる。
【0021】
弾性部材において突出した端縁シール部が、ハウジングの開口部の拡径するテーパー状の端縁の形状に追従するので、正確に安定したシール性を確保することができる。
【0022】
【発明の実施の形態】
以下に図面を参照して、この発明の好適な実施の形態を例示的に詳しく説明する。ただし、この実施の形態に記載されている構成部品の寸法、材質、形状、その相対配置などは、特に特定的な記載がない限りは、この発明の範囲をそれらのみに限定する趣旨のものではない。
【0023】
(第1の実施の形態)
図1を参照して、本発明の第1の実施の形態に係る密封装置および密封機構について説明する。
【0024】
この実施の形態における密封装置1は、互いに同心的に相対回転自在に組み付けられる2部材としてのハウジング11とそのハウジング内に挿入される回転軸12に取り付けられ該軸と一体となって回転するスリーブ部材15との間の環状の隙間を密封するものである。
【0025】
そして、密封装置1は金属性の板材をプレス加工等により成形した中抜き穴を有する金属環13と該金属環13にゴム等を焼き付けまたは接着により固着した弾性部材14とを備えている。
【0026】
そして、弾性部材14の一部としてメインリップ14aを有しており、該メインリップが軸12に取り付けられ該軸と一体となって回転するスリーブ部材15のスリーブ部15bの外周面に摺動自在に接触し、ハウジング11と軸との間の環状隙間を密封流体側Oと大気側Aとにシールしている。さらに、舌状のダストリップ14bがメインリップ14aと連続して設けられており、大気側Aに延び、径方向外向きに傾き、スリーブ部材15のフランジ部15aに摺接するように形成されて、大気側Aからの泥水等が内部に侵入するのを防止している。
【0027】
また、金属環は軸方向に延びる円筒部13aと該円筒部の密封流体側Oの端部から内径側に折り曲がった円環部13bとを有し、該金属環の大気側の面に弾性部材をメインリップ14a,ダストリップ14bと連続的に固着している。
【0028】
そして、軸に固定され一体となって回転するスリーブ部の外周面とハウジングの内周面との間の隙間が小さく、金属環の円筒部13aの外周面には弾性部材を設けるためのスペースを確保することが困難なので、該円筒部13aの外周面を直接ハウジング11の内周面に嵌合し、該密封装置1をハウジング11に固定している。
【0029】
また、本実施の形態においては、ハウジングに設けられた密封装置を装着するための開口部の端縁にテーパー部を設けており、弾性部材が該テーパー部もシールするように、さらに円筒部13aの大気側端部の所定範囲に、前記弾性部材の一部として端縁シール部14cを固着している。
【0030】
該端縁シール部を拡大して示したのが図1(b)であるが、図に示すように、該端縁シール部14cは、金属環の円筒部13aの外周面よりも外側に突出した部分を有しており、該突出した部分が、ハウジングの開口部のテーパー部をシールしている。該突出した部分の形状は、なるべくハウジングの開口部のテーパー部の形状と同様にし、密封装置をハウジングに装着した際に突出した部分がテーパー部の形状に追従しやすいようにすることが望ましい。
【0031】
なお、該所定範囲は、密封装置の幅,ハウジングと該円筒部との嵌め合い締め代等によって使用環境に応じた接触面積・接触圧を確保でき密封装置がハウジングから抜け出さない程度の幅の円筒部が弾性部材で覆われない範囲であることが望ましい。
【0032】
また、金属環の円筒部の該端面部には弾性部材を正確に固着できるように凹部13cを設け、端縁シール部14cの根本の端部が円筒部13aの外周面にはみだして該密封装置1をハウジング11に装着する際に剥がれないようにしてある。
【0033】
かかる構成とすることにより、金属のハウジングに設けられた密封装置の装着部に臨んで開口している開口部の端縁に通常設けられるテーパー部を密封装置1の弾性部材の端縁シール部14cがシールするので、ハウジング11と密封装置1間で密封流体の漏れが生じなくすることができる。
【0034】
また、密封装置1とハウジング11との嵌め合い幅が小さく図5のように円筒部13a広範に弾性部材を固着することができない場合においても、本実施の形態の構成とすることにより、ハウジング11と密封装置1との間で密封流体の漏れが生じなくすることができる。
【0035】
さらに、ハウジングの内周面という平面部をシールするのではなく、斜面である面取り部をシールするので、いわゆるクサビ効果により図5のように弾性部材に大きな突起を設ける必要もなく安定したシール機能を確保することができるので、ハウジングに設けられた開口部の角で弾性部材が傷付けられシール機能を損なうことも防止できる。
【0036】
なお、本実施の形態においては、回転軸12にスリーブ部材15が取り付けられている密封機構に適用した密封装置であるが、本発明は、該スリーブ部材を有さず、メインリップ14aが直接回転軸12の外周面に密封接触する密封装置にも適用できる。
【0037】
また、本実施の形態においては、ハウジングは金属とし密封装置装着のための開口部の端縁に面取り部を有する場合について述べたが、ハウジングが樹脂材である場合も通常は該開口部には面取り部を設けるし、また、面取り部がない場合でも該開口部の端縁は鋭角ではなくR形状であるのが一般的なので、端縁シール部は弾性体であることから該R形状にも追従でき、ハウジングが樹脂材であっても同じようにシールすることができる。
【0038】
また、本実施の形態においては、密封装置の弾性部材は金属環にメインリップ,ダストリップおよび端縁シール部等を連続的に固着させ形成しているが、特に、かかる形状に限定されるものではなく、金属環にメインリップ,ダストリップおよび端縁シール部の各々を独立させて形成してもよい。
【0039】
参考例
第1の実施の形態においては、金属環13の円環部13bが円筒部13aの密封流体側の端部から折り曲がっているタイプの密封装置に適用したものであるが、本参考例では、図2に示すように、円環部13bが円筒部13aの大気側の端部から折り曲がっているタイプの密封装置に適用したものである。
【0040】
そして、金属環13の円筒部13aの大気側端部に端縁シール部14cを固着するための凹部13cを設け、端縁シール部14cの根本の端部が金属環13の円筒部13aの外周面からはみ出さないようにしている。
【0041】
かかる構成とすることにより、本参考例のタイプの密封装置においても、第1の実施の形態の密封装置と同様にハウジング11と密封装置1との間で密封流体が漏れることを確実に防止できる。
【0042】
【発明の効果】
以上説明したように、本発明によれば、スペース的に余裕がない場合においても、密封装置と該密封装置が装着される部材との間に安定したシール性を確保することができる。
【図面の簡単な説明】
【図1】(a)は第1の実施の形態に係る密封装置の半断面図,(b)は(a)のB部分の拡大図である。
【図2】参考例に係る密封装置の半断面図である。
【図3】従来の密封装置の半断面図である。
【図4】他の従来の密封装置の半断面図である。
【図5】他の従来の密封装置の半断面図である。
【符号の説明】
1,100 密封装置
11,101 ハウジング
12,102 回転軸
13,103 金属環
13a,103a 金属環の円筒部
13b,103b 金属環の円環部
13c 凹部
14,104 弾性部材
14a,104a メインリップ
14b,104b ダストリップ
15,105 スリーブ部材
15a,105a スリーブ部材のフランジ部
15b,105b スリーブ部材のスリーブ部
15c 端縁シール部
A 大気側
O 密封流体側
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealing device such as an oil seal used for a shaft seal portion of various devices, and a sealing mechanism including the sealing device.
[0002]
[Prior art]
Conventionally, there is a sealing device and a sealing mechanism of this type as shown in FIG.
[0003]
In FIG. 3, a sealing device 100 is attached to a housing 101 as two members concentrically and relatively rotatably assembled with each other, and a rotary shaft 102 inserted into the housing 101, and has a flange portion 105a on the atmosphere side A. The annular gap between the sleeve members 105 is sealed.
[0004]
The sealing device 100 includes a metal ring 103 having a cylindrical fitting portion 103a assembled on the inner peripheral surface of the housing 101, a radially inward annular portion 103b on the sealing fluid side O, and a rotating shaft 102. And an elastic member 104 such as rubber having a main lip 104a that slidably comes into contact with the outer peripheral surface of the sleeve portion 105b of the sleeve member 105 attached thereto to prevent the sealing fluid from leaking to the atmosphere side. .
[0005]
Further, the elastic member 104 is provided with a tongue-shaped dust lip 104b continuous with the main lip 104a. The dust lip 104b extends to the atmosphere side A, is inclined radially outward, and is formed so as to be in sliding contact with the flange portion 105a of the sleeve portion 105, and prevents muddy water or the like from the atmosphere side A from entering the inside. is doing.
[0006]
The elastic member 104 is fixed to the metal ring by baking or the like so as to wrap the metal ring 103, and the elastic member is also present on the surface of the metal ring 103 facing the housing of the cylindrical portion 103a. The space between the inner peripheral surfaces of 101 is also sealed.
[0007]
However, when the gap between the inner peripheral surface of the housing 101 and the outer peripheral surface of the sleeve portion 105 attached to the shaft 102 is small, there is not enough space, and as shown in FIG. The outer surface of the cylindrical portion 103 a of the metal ring 103 is directly fitted to the inner peripheral surface of the housing 101 without using an elastic member on the surface of the portion 103 a facing the housing.
[0008]
Further, even when the gap between the inner peripheral surface of the housing 101 and the outer peripheral surface of the shaft 102 is small, when the fitting width between the sealing device and the housing is large, as shown in FIG. There is also a type in which an elastic member is fixed to a part of the housing and the inner peripheral surface of the housing is sealed with the elastic member.
[0009]
[Problems to be solved by the invention]
However, in the case of the prior art as described above, the following problems have occurred.
[0010]
When the gap between the inner peripheral surface of the conventional housing 101 and the outer peripheral surface of the shaft 102 is small, the outer peripheral surface of the cylindrical portion 103a of the metal ring 103 is directly fitted on the inner peripheral surface of the housing 101 as shown in FIG. If the housing is made of a material that has a high coefficient of thermal expansion, such as aluminum or resin, the gap between the housing and the metal ring of the sealing device increases as the temperature rises, and the sealed fluid from the mating part There was also a possibility of leakage.
[0011]
Further, when a part of the cylindrical portion as shown in FIG. 5 is covered with an elastic member to seal the inner peripheral surface of the housing 101, the inner peripheral surface of the housing is a flat surface, so that sufficient sealing performance is secured. It is necessary to provide a large protrusion on the elastic member, but when the sealing device is inserted into the housing 101, the protrusion is damaged at the corner of the opening that faces the mounting portion of the sealing device of the housing. There was a risk of damage.
[0012]
In addition, when the fitting width between the sealing device 100 and the housing 101 is small, a sufficient contact area / contact pressure is required between the cylindrical portion and the housing, and therefore a part of the cylindrical portion 103a on the atmosphere side as shown in FIG. As shown in FIG. 4, it is difficult to provide an elastic member on the metal ring, and the cylindrical portion 103a of the metal ring and the inner peripheral surface of the housing must be directly fitted to each other. .
[0013]
The present invention has been made to solve the above-described problems of the prior art. The object of the present invention is to provide a space between a sealing device and a member to which the sealing device is mounted even when there is not enough space. Another object of the present invention is to provide a sealing device capable of ensuring a stable sealing property and a sealing mechanism including the sealing device.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, in the sealing device according to the present invention,
Sealing an annular gap between a shaft assembled concentrically and relatively rotatably and a housing having a shaft hole into which the shaft is inserted,
A metal ring having a cylindrical portion fitted to the inner peripheral surface of the shaft hole of the housing and an annular portion bent from the end on the sealing fluid side of the cylindrical portion toward the inner diameter side;
At the atmosphere side end of the cylindrical portion of the metal ring, a concave portion that is recessed in the inner diameter direction with respect to the outer peripheral surface of the cylindrical portion is provided, and an elastic member is fixed to the region including the concave portion by baking or bonding ,
The atmospheric end of the elastic member does not protrude from the outer peripheral surface of the cylindrical portion of the metal ring , and the tip side is the outer peripheral surface of the cylindrical portion of the metal ring so that the elastic member does not peel off when mounted on the housing. edge seals have a shape protruding outward, sealing the tapered edge of the enlarged diameter of the opening portion which is open facing the mounting portion of the sealing device provided on the shaft hole of the housing with respect to It is a part.
[0015]
Thereby, even when the annular gap between the two members is small, it is possible to ensure a stable sealing property between the sealing device and the member to which the sealing device is attached.
[0017]
In addition , since the edge seal portion protruding outward from the outer peripheral surface of the cylindrical portion of the elastic member follows the shape of the tapered edge of the opening of the member to which the sealing device is attached, it is accurately and stably sealed. Can be secured.
[0018]
In the sealing mechanism according to the present invention,
A housing having a shaft and a shaft hole into which the shaft is inserted, concentrically and relatively rotatably assembled;
A sealing device for sealing an annular gap between the shaft and the housing;
In a sealing mechanism comprising
A sleeve member having a sleeve portion extending in the axial direction and a flange portion extending in the outer diameter direction from the atmosphere side end portion of the sleeve portion is attached to the shaft,
The housing has an opening that opens toward the mounting portion of the sealing device;
The sealing device includes:
A metal ring having a cylindrical portion fitted to the inner peripheral surface of the shaft hole of the housing and an annular portion bent from the end on the sealing fluid side of the cylindrical portion toward the inner diameter side;
A main lip that is in sliding contact with the outer peripheral surface of the sleeve portion of the sleeve member;
A dust strip that slidably contacts the flange portion of the sleeve member,
At the atmosphere side end of the cylindrical portion of the metal ring, a concave portion that is recessed in the inner diameter direction with respect to the outer peripheral surface of the cylindrical portion is provided, and an elastic member is fixed to the region including the concave portion by baking or bonding ,
The atmospheric end of the elastic member does not protrude from the outer peripheral surface of the cylindrical portion of the metal ring , and the tip side is the outer peripheral surface of the cylindrical portion of the metal ring so that the elastic member does not peel off when mounted on the housing. edge seals have a shape protruding outward, sealing the tapered edge of the enlarged diameter of the opening portion which is open facing the mounting portion of the sealing device provided on the shaft hole of the housing with respect to It is a part.
[0019]
This prevents dust from entering the sealed fluid side even in environments where the dust conditions on the atmosphere side such as muddy water are severe, and also prevents the sealed fluid from leaking between the sealing device and the housing. A sealing mechanism that can be prevented can be formed.
[0021]
Since the edge seal portion protruding from the elastic member follows the shape of the tapered edge that expands the diameter of the opening of the housing, an accurate and stable sealing property can be ensured.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Exemplary embodiments of the present invention will be described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. Absent.
[0023]
(First embodiment)
With reference to FIG. 1, a sealing device and a sealing mechanism according to a first embodiment of the present invention will be described.
[0024]
The sealing device 1 in this embodiment includes a housing 11 as two members which are assembled concentrically and relatively rotatably, and a sleeve which is attached to a rotating shaft 12 inserted into the housing and rotates integrally with the shaft. The annular gap between the member 15 is sealed.
[0025]
The sealing device 1 includes a metal ring 13 having a hollow hole formed by pressing a metallic plate material by pressing or the like, and an elastic member 14 having rubber or the like fixed to the metal ring 13 by baking or bonding.
[0026]
A main lip 14a is provided as a part of the elastic member 14, and the main lip is attached to the shaft 12 and is slidable on the outer peripheral surface of the sleeve portion 15b of the sleeve member 15 that rotates integrally with the shaft. The annular gap between the housing 11 and the shaft is sealed to the sealed fluid side O and the atmosphere side A. Further, a tongue-shaped dust lip 14b is provided continuously with the main lip 14a, extends to the atmosphere side A, is inclined radially outward, and is slidably contacted with the flange portion 15a of the sleeve member 15. Muddy water from the atmosphere side A is prevented from entering the inside.
[0027]
The metal ring has a cylindrical portion 13a extending in the axial direction and an annular portion 13b bent from the end on the sealed fluid side O of the cylindrical portion toward the inner diameter side. The metal ring is elastic on the atmosphere side surface of the metal ring. The member is continuously fixed to the main lip 14a and the dust lip 14b.
[0028]
The gap between the outer peripheral surface of the sleeve portion fixed to the shaft and rotating integrally with the inner peripheral surface of the housing is small, and a space for providing an elastic member is provided on the outer peripheral surface of the cylindrical portion 13a of the metal ring. Since it is difficult to ensure, the outer peripheral surface of the cylindrical portion 13 a is directly fitted to the inner peripheral surface of the housing 11, and the sealing device 1 is fixed to the housing 11.
[0029]
In the present embodiment, a tapered portion is provided at the edge of the opening for mounting the sealing device provided in the housing, and the cylindrical portion 13a is further sealed so that the elastic member also seals the tapered portion. An edge seal portion 14c is fixed as a part of the elastic member in a predetermined range of the atmospheric end portion.
[0030]
FIG. 1B shows an enlarged view of the edge seal portion. As shown in the figure, the edge seal portion 14c protrudes outward from the outer peripheral surface of the cylindrical portion 13a of the metal ring. The projecting portion seals the tapered portion of the opening of the housing. It is desirable that the shape of the protruding portion is as similar as possible to the shape of the tapered portion of the opening of the housing, and that the protruding portion easily follows the shape of the tapered portion when the sealing device is mounted on the housing.
[0031]
The predetermined range is a cylinder having a width that can secure a contact area and a contact pressure according to the use environment by a width of the sealing device, a fitting tightening margin between the housing and the cylindrical portion, and the like so that the sealing device does not come out of the housing. It is desirable that the portion is in a range not covered with the elastic member.
[0032]
Further, a concave portion 13c is provided on the end surface portion of the cylindrical portion of the metal ring so that the elastic member can be accurately fixed, and the base end portion of the edge seal portion 14c protrudes from the outer peripheral surface of the cylindrical portion 13a. 1 is not peeled off when mounted on the housing 11.
[0033]
By adopting such a configuration, the taper portion that is normally provided at the end edge of the opening that faces the mounting portion of the sealing device provided in the metal housing is replaced by the edge seal portion 14c of the elastic member of the sealing device 1. Therefore, the leakage of the sealing fluid between the housing 11 and the sealing device 1 can be prevented.
[0034]
Further, even when the fitting width between the sealing device 1 and the housing 11 is small and the elastic member cannot be firmly fixed to the cylindrical portion 13a as shown in FIG. And the sealing device 1 can be prevented from leaking the sealing fluid.
[0035]
Further, since the chamfered portion which is an inclined surface is sealed instead of sealing the flat surface portion of the inner peripheral surface of the housing, a stable sealing function without the need to provide a large protrusion on the elastic member as shown in FIG. 5 due to the so-called wedge effect. Therefore, it is possible to prevent the elastic member from being damaged at the corner of the opening provided in the housing and impairing the sealing function.
[0036]
In the present embodiment, the sealing device is applied to a sealing mechanism in which the sleeve member 15 is attached to the rotary shaft 12, but the present invention does not have the sleeve member and the main lip 14a rotates directly. The present invention can also be applied to a sealing device that sealingly contacts the outer peripheral surface of the shaft 12.
[0037]
In the present embodiment, the case where the housing is made of metal and has a chamfered portion at the edge of the opening for mounting the sealing device has been described. A chamfered portion is provided, and even if there is no chamfered portion, the edge of the opening is generally not an acute angle but an R shape. Therefore, since the edge seal portion is an elastic body, the R shape is also used. Even if the housing is a resin material, it can be sealed in the same manner.
[0038]
In the present embodiment, the elastic member of the sealing device is formed by continuously fixing the main lip, the dust lip, the edge seal portion, and the like to the metal ring. Instead, each of the main lip, the dust strip and the edge seal portion may be formed independently on the metal ring.
[0039]
( Reference example )
In the first embodiment, in which the annular portion 13b of the metal ring 13 is applied to the sealing device of the type bent from the end portion of the sealed fluid side of the cylindrical portion 13a, in the present reference example, As shown in FIG. 2, the annular portion 13b is applied to a sealing device of a type that is bent from an end portion on the atmosphere side of the cylindrical portion 13a.
[0040]
And the recessed part 13c for adhering the edge seal part 14c to the air | atmosphere side edge part of the cylindrical part 13a of the metal ring 13 is provided, and the fundamental edge part of the edge seal part 14c is the outer periphery of the cylindrical part 13a of the metal ring 13 It does not protrude from the surface.
[0041]
By adopting such a configuration, also in the sealing device of the type of this reference example , it is possible to reliably prevent the sealing fluid from leaking between the housing 11 and the sealing device 1 as in the sealing device of the first embodiment. .
[0042]
【The invention's effect】
As described above, according to the present invention, a stable sealing property can be ensured between the sealing device and the member to which the sealing device is mounted even when there is no space.
[Brief description of the drawings]
FIG. 1A is a half sectional view of a sealing device according to a first embodiment, and FIG. 1B is an enlarged view of a portion B in FIG.
FIG. 2 is a half sectional view of a sealing device according to a reference example .
FIG. 3 is a half sectional view of a conventional sealing device.
FIG. 4 is a half sectional view of another conventional sealing device.
FIG. 5 is a half sectional view of another conventional sealing device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,100 Sealing device 11,101 Housing 12,102 Rotating shaft 13,103 Metal ring 13a, 103a Metal ring cylindrical part 13b, 103b Metal ring circular part 13c Recess 14, 104 Elastic member 14a, 104a Main lip 14b, 104b Dustrip 15, 105 Sleeve member 15a, 105a Sleeve member flange 15b, 105b Sleeve member sleeve 15c Edge seal A Atmosphere side O Sealed fluid side

Claims (2)

互いに同心的に相対回転自在に組み付けられる軸と該軸が挿入される軸孔を有するハウジングとの間の環状の隙間をシールするもので、
前記ハウジングの軸孔の内周面に嵌合される円筒部と該円筒部の密封流体側の端部から内径側に折り曲がった円環部とを有する金属環と、を備え、
前記金属環の円筒部の大気側端部には、円筒部の外周面に対して内径方向にへこむ凹部が設けられるとともに、該凹部を含む領域に弾性部材が焼き付けまたは接着により固着されており、
前記弾性部材の大気側は、前記ハウジングに装着する際に剥がれないようにすべく根本端部が前記金属環の円筒部の外周面にはみ出さず、先端側が前記金属環の円筒部の外周面に対して外側に突出する形状を有し、前記ハウジングの軸孔に設けられた密封装置の装着部に臨んで開口している開口部の拡径するテーパー状の端縁をシールする端縁シール部であることを特徴とする密封装置。
Sealing an annular gap between a shaft assembled concentrically and relatively rotatably and a housing having a shaft hole into which the shaft is inserted,
A metal ring having a cylindrical portion fitted to the inner peripheral surface of the shaft hole of the housing and an annular portion bent from the end on the sealing fluid side of the cylindrical portion toward the inner diameter side;
At the atmosphere side end of the cylindrical portion of the metal ring, a concave portion that is recessed in the inner diameter direction with respect to the outer peripheral surface of the cylindrical portion is provided, and an elastic member is fixed to the region including the concave portion by baking or bonding ,
The atmospheric end of the elastic member does not protrude from the outer peripheral surface of the cylindrical portion of the metal ring , and the tip side is the outer peripheral surface of the cylindrical portion of the metal ring so that the elastic member does not peel off when mounted on the housing. edge seals have a shape protruding outward, sealing the tapered edge of the enlarged diameter of the opening portion which is open facing the mounting portion of the sealing device provided on the shaft hole of the housing with respect to The sealing device characterized by being a part.
互いに同心的に相対回転自在に組み付けられる、軸と該軸が挿入される軸孔を有するハウジングと、
該軸と該ハウジングとの間の環状の隙間をシールする密封装置と、
を備えた密封機構において、
軸方向に延びるスリーブ部と該スリーブ部の大気側端部から外径方向に延びるフランジ部とを有するスリーブ部材が前記軸に装着されると共に、
前記ハウジングは、前記密封装置の装着部に臨んで開口している開口部を有し、
前記密封装置は、
前記ハウジングの軸孔の内周面に嵌合される円筒部と該円筒部の密封流体側の端部から内径側に折り曲がった円環部とを有する金属環と、
前記スリーブ部材のスリーブ部の外周面に摺接するメインリップと、
前記スリーブ部材のフランジ部に摺接するダストリップと、を備え、
前記金属環の円筒部の大気側端部には、円筒部の外周面に対して内径方向にへこむ凹部が設けられるとともに、該凹部を含む領域に弾性部材が焼き付けまたは接着により固着されており、
前記弾性部材の大気側は、前記ハウジングに装着する際に剥がれないようにすべく根本端部が前記金属環の円筒部の外周面にはみ出さず、先端側が前記金属環の円筒部の外周面に対して外側に突出する形状を有し、前記ハウジングの軸孔に設けられた密封装置の装着部に臨んで開口している開口部の拡径するテーパー状の端縁をシールする端縁シール部であることを特徴とする密封機構。
A housing having a shaft and a shaft hole into which the shaft is inserted, concentrically and relatively rotatably assembled;
A sealing device for sealing an annular gap between the shaft and the housing;
In a sealing mechanism comprising
A sleeve member having a sleeve portion extending in the axial direction and a flange portion extending in the outer diameter direction from the atmosphere side end portion of the sleeve portion is attached to the shaft,
The housing has an opening that opens toward the mounting portion of the sealing device;
The sealing device includes:
A metal ring having a cylindrical portion fitted to the inner peripheral surface of the shaft hole of the housing and an annular portion bent from the end on the sealing fluid side of the cylindrical portion toward the inner diameter side;
A main lip that is in sliding contact with the outer peripheral surface of the sleeve portion of the sleeve member;
A dust strip that slidably contacts the flange portion of the sleeve member,
At the atmosphere side end of the cylindrical portion of the metal ring, a concave portion that is recessed in the inner diameter direction with respect to the outer peripheral surface of the cylindrical portion is provided, and an elastic member is fixed to the region including the concave portion by baking or bonding ,
The atmospheric end of the elastic member does not protrude from the outer peripheral surface of the cylindrical portion of the metal ring , and the tip side is the outer peripheral surface of the cylindrical portion of the metal ring so that the elastic member does not peel off when mounted on the housing. edge seals have a shape protruding outward, sealing the tapered edge of the enlarged diameter of the opening portion which is open facing the mounting portion of the sealing device provided on the shaft hole of the housing with respect to A sealing mechanism characterized by being a part.
JP2002178662A 2002-06-19 2002-06-19 Sealing device and sealing mechanism Expired - Lifetime JP4380114B2 (en)

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