JP7432171B2 - sealing device - Google Patents

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JP7432171B2
JP7432171B2 JP2019155255A JP2019155255A JP7432171B2 JP 7432171 B2 JP7432171 B2 JP 7432171B2 JP 2019155255 A JP2019155255 A JP 2019155255A JP 2019155255 A JP2019155255 A JP 2019155255A JP 7432171 B2 JP7432171 B2 JP 7432171B2
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recess
sealing device
shaft
seal lip
main body
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JP2021032377A (en
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渉 ▲徳▼永
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Nok Corp
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Description

本発明は、密封装置に関する。 The present invention relates to a sealing device.

油圧シリンダ等の油圧機器では、外部からのダスト等の異物の進入を防ぐダストシール、および、内部からの油の漏れを防ぐオイルシール等のシール（以下、密封装置とも称する）が用いられる。例えば、特許文献１には、ピストンが挿入される軸孔を有する筒状のシリンダに装着され、軸孔とピストンとの間の環状の隙間を封止するための密封装置が開示されている。また、特許文献２には、内周側のシールリップと外周側のシールリップとの間に形成された環状の凹部に金属スプリングが装着された密封装置が開示されている。金属スプリングによって、内周側のシールリップは内径方向に付勢され、外周側のシールリップは、外形方向に付勢される。これにより、例えば、シリンダに装着された密封装置のシールリップと軸との密着性が向上する。また、特許文献３には、ダストシールとして機能するリップ（以下、ダストシール部とも称する）とオイルシールとして機能するリップ（以下、オイルシール部とも称する）とを１つの本体部材に形成した密封装置が開示されている。 BACKGROUND ART Hydraulic equipment such as hydraulic cylinders uses seals (hereinafter also referred to as sealing devices) such as dust seals that prevent foreign matter such as dust from entering from the outside, and oil seals that prevent oil from leaking from inside. For example, Patent Document 1 discloses a sealing device that is attached to a cylindrical cylinder having a shaft hole into which a piston is inserted, and is used to seal an annular gap between the shaft hole and the piston. Further, Patent Document 2 discloses a sealing device in which a metal spring is attached to an annular recess formed between an inner seal lip and an outer seal lip. The metal spring urges the seal lip on the inner circumferential side in the direction of the inner diameter, and the seal lip on the outer circumference side in the direction of the outer circumference. This improves, for example, the close contact between the seal lip of the sealing device attached to the cylinder and the shaft. Further, Patent Document 3 discloses a sealing device in which a lip that functions as a dust seal (hereinafter also referred to as a dust seal portion) and a lip that functions as an oil seal (hereinafter also referred to as an oil seal portion) are formed in one main body member. has been done.

特開２００８－１９０６６１号公報Japanese Patent Application Publication No. 2008-190661 特開２００９－２１６１６８号公報JP2009-216168A 特開２０１２－２１５１８８号公報Japanese Patent Application Publication No. 2012-215188

ダストシールとして機能するダストシール部とオイルシールとして機能するオイルシール部とを１つの本体部材に形成した場合、オイルシール部で受けた油圧によって、ダストシール部のリップ形状が崩れ、ダストシール部のシール性が低下するおそれがある。ダストシール部のシール性が低下すると、外部から進入したダスト等の異物によりオイルシール部が損傷し、オイルシール部のシール性が低下する可能性がある。以上の事情を考慮して、本発明は、ダストシール部とオイルシール部とを１つの本体部材に形成した密封装置の耐圧を向上させることを目的とする。 When a dust seal section that functions as a dust seal and an oil seal section that functions as an oil seal are formed in one main body member, the lip shape of the dust seal section collapses due to the hydraulic pressure received by the oil seal section, and the sealing performance of the dust seal section decreases. There is a risk of If the sealing performance of the dust seal portion deteriorates, the oil seal portion may be damaged by foreign matter such as dust that has entered from the outside, and the sealing performance of the oil seal portion may deteriorate. In consideration of the above circumstances, an object of the present invention is to improve the pressure resistance of a sealing device in which a dust seal portion and an oil seal portion are formed in one main body member.

以上の課題を解決するために、本発明の一態様に係る密封装置は、軸部材と、前記軸部材が挿入される軸孔が設けられた軸受部材の内周面との間の隙間を密封する密封装置であって、前記軸部材の軸に沿う第１方向に開口する第１凹部、および、前記第１方向と反対方向の第２方向に開口する第２凹部を有する環状の本体部材と、前記第１凹部の表面に接合された付勢部材とを備え、前記本体部材は、前記軸受部材と前記第１凹部との間に位置し、前記軸受部材に接触する第１部分と、前記軸部材と前記第１凹部との間に位置し、前記軸部材に対して摺動する第２部分と、前記軸受部材と前記第２凹部との間に位置し、前記軸受部材に接触する第３部分と、前記軸部材と前記第２凹部との間に位置し、前記軸部材に対して摺動する第４部分とを備え、前記付勢部材は、硬質樹脂により形成された弾性体であり、前記第１部分を前記軸受部材側に付勢し、前記第２部分を前記軸部材側に付勢する。 In order to solve the above problems, a sealing device according to one aspect of the present invention seals a gap between a shaft member and an inner peripheral surface of a bearing member provided with a shaft hole into which the shaft member is inserted. A sealing device comprising: a first recess opening in a first direction along the axis of the shaft member; and a second recess opening in a second direction opposite to the first direction. , a biasing member joined to a surface of the first recess, the main body member having a first portion located between the bearing member and the first recess and in contact with the bearing member; a second portion located between the shaft member and the first recess and sliding with respect to the shaft member; a second portion located between the bearing member and the second recess and contacting the bearing member; and a fourth portion that is located between the shaft member and the second recess and slides with respect to the shaft member, and the biasing member is an elastic body made of hard resin. The first portion is biased toward the bearing member, and the second portion is biased toward the shaft member.

本発明の他の態様に係る密封装置は、軸部材と、前記軸部材が挿入される軸孔が設けられた軸受部材の内周面との間の隙間を密封する密封装置であって、前記軸部材の軸に沿う第１方向に開口する第１凹部、および、前記第１方向と反対方向の第２方向に開口する第２凹部を有する環状の本体部材と、前記第１凹部の表面に接合された付勢部材とを備え、前記本体部材は、前記軸部材と前記第１凹部との間に位置し、前記軸部材に接触する第１部分と、前記軸受部材と前記第１凹部との間に位置し、前記軸受部材に対して摺動する第２部分と、前記軸部材と前記第２凹部との間に位置し、前記軸部材に接触する第３部分と、前記軸受部材と前記第２凹部との間に位置し、前記軸受部材に対して摺動する第４部分とを備え、前記付勢部材は、硬質樹脂により形成された弾性体であり、前記第１部分を前記軸部材側に付勢し、前記第２部分を前記軸受部材側に付勢する。 A sealing device according to another aspect of the present invention is a sealing device for sealing a gap between a shaft member and an inner circumferential surface of a bearing member provided with a shaft hole into which the shaft member is inserted, an annular main body member having a first recess opening in a first direction along the axis of the shaft member and a second recess opening in a second direction opposite to the first direction; a joined biasing member, the main body member includes a first portion that is located between the shaft member and the first recess and contacts the shaft member, and the bearing member and the first recess. a second portion that is located between the shaft member and the second recess and that slides with respect to the bearing member; a third portion that is located between the shaft member and the second recess that contacts the shaft member; a fourth portion located between the second recess and sliding with respect to the bearing member; the biasing member is an elastic body made of hard resin; The second portion is biased toward the shaft member, and the second portion is biased toward the bearing member.

なお、「環状」は、空間を包囲するようにループする直線または曲線により構成される形状を意味する。例えば、「環状」は、円形状でもよいし、多角形状（例えば、矩形状）でもよい。 Note that "annular" means a shape formed by a straight line or curved line that loops so as to surround a space. For example, "annular" may be circular or polygonal (for example, rectangular).

本発明によれば、ダストシール部とオイルシール部とを１つの本体部材に形成した密封装置の耐圧を向上させることができる。 According to the present invention, it is possible to improve the pressure resistance of a sealing device in which a dust seal portion and an oil seal portion are formed in one main body member.

実施形態に係る密封装置がハウジングに装着された状態を示す模式的断面図である。FIG. 2 is a schematic cross-sectional view showing a state in which the sealing device according to the embodiment is attached to the housing. 実施形態に係る密封装置の模式的断面図である。FIG. 2 is a schematic cross-sectional view of a sealing device according to an embodiment. 変形例１に係る密封装置が軸に装着された状態を示す模式的断面図である。FIG. 7 is a schematic cross-sectional view showing a state in which a sealing device according to Modification Example 1 is attached to a shaft.

以下、本発明を実施するための形態について図面を参照して説明する。ただし、各図において、各部の寸法および縮尺は、実際のものと適宜に異ならせてある。また、以下に述べる実施の形態は、本発明の好適な具体例であるから、技術的に好ましい種々の限定が付されているが、本発明の範囲は、以下の説明において特に本発明を限定する旨の記載がない限り、これらの形態に限られるものではない。 Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. However, in each figure, the dimensions and scale of each part are appropriately different from the actual ones. Furthermore, since the embodiments described below are preferred specific examples of the present invention, various technically preferable limitations are attached thereto. Unless there is a statement to that effect, it is not limited to these forms.

［１．実施形態］
以下、本発明の実施形態を説明する。 [1. Embodiment]
Embodiments of the present invention will be described below.

図１は、実施形態に係る密封装置１０がハウジング３０に装着された状態を示す模式的断面図である。密封装置１０は、例えば、円柱形状を有するピストンロッド等の軸２０（「軸部材」の一例）と、軸２０が挿入される軸孔３２が設けられたハウジング３０（「軸受部材」の一例）の内周面との間の隙間ＧＰを密封する。例えば、軸孔３２に挿入された軸２０は、軸２０の中心軸Ｚ（「軸部材の軸」の一例）に沿って往復移動する。すなわち、密封装置１０は、軸２０とハウジング３０とが相対的に移動する機構を含む油圧シリンダ等の機器１（全体は図示せず）に用いられる。図１に示す例では、機器１は、ハウジング３０と、ハウジング３０に設けられた軸孔３２に挿入される軸２０と、ハウジング３０の内周面に設けられた環状の凹部３４に装着された環状の密封装置１０とを有する。本実施形態では、機器１内（図１の油側Ａ）に密封される流体が油である場合を想定するが、流体は油に限定されない。 FIG. 1 is a schematic cross-sectional view showing a state in which a sealing device 10 according to an embodiment is attached to a housing 30. As shown in FIG. The sealing device 10 includes, for example, a shaft 20 such as a cylindrical piston rod (an example of a "shaft member"), and a housing 30 (an example of a "bearing member") provided with a shaft hole 32 into which the shaft 20 is inserted. The gap GP between the inner circumferential surface of the For example, the shaft 20 inserted into the shaft hole 32 reciprocates along the central axis Z of the shaft 20 (an example of the "axis of the shaft member"). That is, the sealing device 10 is used in a device 1 (not shown in its entirety) such as a hydraulic cylinder that includes a mechanism in which a shaft 20 and a housing 30 move relative to each other. In the example shown in FIG. 1, the device 1 includes a housing 30, a shaft 20 inserted into a shaft hole 32 provided in the housing 30, and an annular recess 34 provided in the inner peripheral surface of the housing 30. It has an annular sealing device 10. In this embodiment, it is assumed that the fluid sealed inside the device 1 (oil side A in FIG. 1) is oil, but the fluid is not limited to oil.

例えば、密封装置１０は、軸２０の中心軸Ｚに沿う第１方向Ｄ１に開口する環状の第１凹部１１０、および、第１方向Ｄ１と反対方向の第２方向Ｄ２に開口する環状の第２凹部１２０を有する環状の本体部材１００と、第１凹部１１０の表面に接合された環状の付勢部材１４０とを有する。例えば、密封装置１０がハウジング３０に装着された状態において、密封装置１０から中心軸Ｚに沿って大気側Ｂに向かう方向が第１方向Ｄ１に対応し、密封装置１０から中心軸Ｚに沿って油側Ａに向かう方向が第２方向Ｄ２に対応する。また、密封装置１０がハウジング３０に装着された状態において、中心軸Ｚに垂直な方向は、密封装置１０の半径方向Ｒ（図１では、半径方向Ｒ１およびＲ２を図示）に対応する。密封装置１０の半径方向Ｒは、「本体部材の半径方向」に該当する。 For example, the sealing device 10 includes a first annular recess 110 that opens in a first direction D1 along the central axis Z of the shaft 20, and a second annular recess that opens in a second direction D2 opposite to the first direction D1. It has an annular main body member 100 having a recess 120 and an annular biasing member 140 joined to the surface of the first recess 110 . For example, when the sealing device 10 is attached to the housing 30, the direction from the sealing device 10 toward the atmosphere side B along the central axis Z corresponds to the first direction D1, and the direction from the sealing device 10 along the central axis Z corresponds to the first direction D1. The direction toward the oil side A corresponds to the second direction D2. Further, in a state where the sealing device 10 is attached to the housing 30, the direction perpendicular to the central axis Z corresponds to the radial direction R of the sealing device 10 (radial directions R1 and R2 are shown in FIG. 1). The radial direction R of the sealing device 10 corresponds to the "radial direction of the main body member."

本体部材１００は、例えば、樹脂により形成された弾性体であり、第１シールリップ１１１（「第１部分」の一例）、第２シールリップ１１２（「第２部分」の一例）、第３シールリップ１２１（「第３部分」の一例）および第４シールリップ１２２（「第４部分」の一例）を有する。本体部材１００の材料としては、例えば、ウレタン樹脂およびフッ素樹脂等の弾性材料が挙げられる。 The main body member 100 is an elastic body made of resin, for example, and includes a first seal lip 111 (an example of a "first part"), a second seal lip 112 (an example of a "second part"), and a third seal. It has a lip 121 (an example of a "third part") and a fourth seal lip 122 (an example of a "fourth part"). Examples of the material for the main body member 100 include elastic materials such as urethane resin and fluororesin.

第１シールリップ１１１は、ハウジング３０と第１凹部１１０との間に位置する本体部材１００の部分であり、ハウジング３０に設けられた凹部３４の底面３４ｂｔに接触する。第２シールリップ１１２は、軸２０と第１凹部１１０との間に位置する本体部材１００の部分であり、軸２０の表面に対して摺動する。このため、第２シールリップ１１２は、ダストシールとして機能する。例えば、第２シールリップ１１２は、大気側Ｂからのダスト等の異物の進入を防ぐとともに、軸２０に付着した異物を掻き落とす。第３シールリップ１２１は、ハウジング３０と第２凹部１２０との間に位置する本体部材１００の部分であり、ハウジング３０に設けられた凹部３４の底面３４ｂｔに接触する。第４シールリップ１２２は、軸２０と第２凹部１２０との間に位置する本体部材１００の部分であり、軸２０の表面に対して摺動する。このため、第４シールリップ１２２は、油側Ａからの油漏れを防ぐオイルシールとして機能する。 The first seal lip 111 is a portion of the main body member 100 located between the housing 30 and the first recess 110, and contacts the bottom surface 34bt of the recess 34 provided in the housing 30. The second sealing lip 112 is a portion of the body member 100 located between the shaft 20 and the first recess 110 and slides against the surface of the shaft 20. Therefore, the second seal lip 112 functions as a dust seal. For example, the second seal lip 112 prevents foreign matter such as dust from entering from the atmospheric side B, and also scrapes off foreign matter adhering to the shaft 20. The third seal lip 121 is a portion of the main body member 100 located between the housing 30 and the second recess 120, and contacts the bottom surface 34bt of the recess 34 provided in the housing 30. The fourth sealing lip 122 is a portion of the main body member 100 located between the shaft 20 and the second recess 120 and slides against the surface of the shaft 20. Therefore, the fourth seal lip 122 functions as an oil seal that prevents oil leakage from the oil side A.

付勢部材１４０は、樹脂により形成された弾性体であり、第１シールリップ１１１をハウジング３０側に付勢し、第２シールリップ１１２を軸２０側に付勢する。付勢部材１４０の材料としては、例えば、ナイロン樹脂等の硬質の弾性材料が挙げられる。付勢部材１４０は、本体部材１００の第１凹部１１０の表面と接着されてもよいし、本体部材１００の第１凹部１１０の表面と融着されてもよい。 The biasing member 140 is an elastic body made of resin, and biases the first seal lip 111 toward the housing 30 side and biases the second seal lip 112 toward the shaft 20 side. Examples of the material for the biasing member 140 include hard elastic materials such as nylon resin. The biasing member 140 may be adhered to the surface of the first recess 110 of the main body member 100 or may be fused to the surface of the first recess 110 of the main body member 100.

付勢部材１４０は、ナイロン樹脂等の硬質の弾性材料で形成されるため、第１方向Ｄ１よりも、密封装置１０の半径方向Ｒ（より詳細には、密封装置１０の中心から外側に向かう半径方向Ｒ）に変形しやすい。したがって、付勢部材１４０は、第１方向Ｄ１への力に対する第２シールリップ１１２の剛性を向上させる。すなわち、密封装置１０では、付勢部材１４０が第２シールリップ１１２に接合されていない密封装置（以下、対比例１の密封装置とも称する）に比べて、第１方向Ｄ１への力に対する第２シールリップ１１２の剛性が高くなる。以下では、密封装置１０が油圧を受けた場合の第２シールリップ１１２の状態について、対比例１の密封装置と比較しながら、簡単に説明する。 Since the biasing member 140 is formed of a hard elastic material such as nylon resin, the biasing member 140 is formed in the radial direction R of the sealing device 10 (more specifically, the radius outward from the center of the sealing device 10) rather than in the first direction D1. It is easy to deform in direction R). Therefore, the biasing member 140 improves the rigidity of the second seal lip 112 against forces in the first direction D1. That is, in the sealing device 10, compared to a sealing device in which the biasing member 140 is not joined to the second seal lip 112 (hereinafter also referred to as the sealing device of Comparative Example 1), the biasing member 140 has a higher The rigidity of the seal lip 112 is increased. Below, the state of the second seal lip 112 when the sealing device 10 receives hydraulic pressure will be briefly described while comparing with the sealing device of Comparative Example 1.

対比例１の密封装置では、密封装置が受けた油圧によって、第２シールリップ１１２は、油圧の方向である第１方向Ｄ１に変形する。したがって、比較例の密封装置では、密封装置が油圧を受けた場合、第２シールリップ１１２の大気側Ｂの端部１１２ｅｄが軸２０とハウジング３０の内周面との間の隙間ＧＰにはみ出す。このため、対比例１の密封装置における第２シールリップ１１２は、第２シールリップ１１２の端部１１２ｅｄが隙間ＧＰにはみ出ない構成に比べて、損傷または磨耗しやすい。第２シールリップ１１２の形状が崩れると、第２シールリップ１１２のシール性が低下し、大気側Ｂから進入した異物により第４シールリップ１２２が損傷する。第４シールリップ１２２が損傷すると、第４シールリップ１２２のシール性が低下し、油側Ａからの油漏れが発生する。すなわち、油側Ａからの圧力によって第２シールリップ１１２の端部１１２ｅｄが隙間ＧＰにはみ出す対比例１の密封装置では、第２シールリップ１１２の端部１１２ｅｄが隙間ＧＰにはみ出ない構成に比べて、油側Ａからの圧力に対する耐圧が低い。 In the sealing device of Comparison 1, the second seal lip 112 is deformed in the first direction D1, which is the direction of the hydraulic pressure, due to the hydraulic pressure received by the sealing device. Therefore, in the sealing device of the comparative example, when the sealing device receives hydraulic pressure, the end 112ed of the second sealing lip 112 on the atmosphere side B protrudes into the gap GP between the shaft 20 and the inner peripheral surface of the housing 30. Therefore, the second seal lip 112 in the sealing device of Comparative Example 1 is more likely to be damaged or worn than a configuration in which the end portion 112ed of the second seal lip 112 does not protrude into the gap GP. When the shape of the second seal lip 112 collapses, the sealing performance of the second seal lip 112 deteriorates, and the fourth seal lip 122 is damaged by foreign matter entering from the atmospheric side B. If the fourth seal lip 122 is damaged, the sealing performance of the fourth seal lip 122 will deteriorate, and oil leakage from the oil side A will occur. That is, in the sealing device of Comparative Example 1 in which the end 112ed of the second seal lip 112 protrudes into the gap GP due to the pressure from the oil side A, compared to the configuration in which the end 112ed of the second seal lip 112 does not protrude into the gap GP. , the pressure resistance against the pressure from the oil side A is low.

これに対し、本実施形態では、上述したように、第１方向Ｄ１への力に対する第２シールリップ１１２の剛性が向上しているため、第２シールリップ１１２は、第１方向Ｄ１への圧力を密封装置１０が受けた場合でも、第１方向Ｄ１よりも、密封装置１０の半径方向Ｒに変形しやすい。このため、密封装置１０の第２シールリップ１１２は、密封装置１０が油圧を受けた場合、密封装置１０の半径方向Ｒに変形する。これにより、本実施形態では、対比例１の密封装置に比べて、第２シールリップ１１２の大気側Ｂの端部１１２ｅｄが、軸２０とハウジング３０の内周面との間の隙間ＧＰにはみ出すことを低減できる。したがって、本実施形態では、対比例１の密封装置に比べて、油側Ａからの圧力に対する耐圧を高くすることができる。すなわち、本実施形態では、ダストシールとして機能する第２シールリップ１１２とオイルシールとして機能する第４シールリップ１２２とを１つの本体部材１００に形成した密封装置１０の耐圧を向上させることができる。 In contrast, in the present embodiment, as described above, the rigidity of the second seal lip 112 against the force in the first direction D1 is improved, so that the second seal lip 112 can resist the pressure in the first direction D1. Even if the sealing device 10 is subjected to this, the sealing device 10 is more likely to deform in the radial direction R than in the first direction D1. Therefore, the second seal lip 112 of the sealing device 10 deforms in the radial direction R of the sealing device 10 when the sealing device 10 receives hydraulic pressure. As a result, in this embodiment, compared to the sealing device of Comparative Example 1, the end 112ed of the second seal lip 112 on the atmosphere side B protrudes into the gap GP between the shaft 20 and the inner peripheral surface of the housing 30. This can reduce the Therefore, in this embodiment, the pressure resistance against the pressure from the oil side A can be increased compared to the sealing device of Comparative Example 1. That is, in this embodiment, the pressure resistance of the sealing device 10 in which the second seal lip 112 functioning as a dust seal and the fourth seal lip 122 functioning as an oil seal are formed in one main body member 100 can be improved.

また、本実施形態では、第２シールリップ１１２が第１方向Ｄ１よりも密封装置１０の半径方向Ｒに変形しやすいため、第２シールリップ１１２の摺動面の圧力が過度に高くなることを防止することができる。この結果、本実施形態では、第２シールリップ１１２の摺動面の磨耗を低減することができる。なお、第２シールリップ１１２の摺動面としては、例えば、第２シールリップ１１２と軸２０との接触部分が該当する。 Further, in this embodiment, since the second seal lip 112 is more easily deformed in the radial direction R of the sealing device 10 than in the first direction D1, the pressure on the sliding surface of the second seal lip 112 is prevented from becoming excessively high. It can be prevented. As a result, in this embodiment, wear of the sliding surface of the second seal lip 112 can be reduced. Note that the sliding surface of the second seal lip 112 corresponds to, for example, the contact portion between the second seal lip 112 and the shaft 20.

また、金属スプリングの付勢部材が第１凹部１１０の表面に配置された密封装置（以下、対比例２の密封装置とも称する）も考えられるが、金属スプリングの付勢部材は、ナイロン樹脂等の硬質の弾性材料で形成された付勢部材１４０に比べて、塑性変化しやすい。換言すれば、密封装置１０の付勢部材１４０は、金属スプリングの付勢部材に比べて、塑性変形しにくい。このため、密封装置１０の付勢部材１４０では、金属スプリングの付勢部材に比べて、第２シールリップ１１２を軸２０側に付勢する機能が低下することを低減できる。すなわち、密封装置１０では、対比例２の密封装置に比べて、第２シールリップ１１２のシール性が低下することを低減することができる。 Further, a sealing device in which a metal spring biasing member is disposed on the surface of the first recess 110 (hereinafter also referred to as the sealing device of Comparative Example 2) is also considered, but the metal spring biasing member is made of nylon resin or the like. Compared to the biasing member 140 made of a hard elastic material, the biasing member 140 is more likely to change plastically. In other words, the urging member 140 of the sealing device 10 is less likely to be plastically deformed than a metal spring urging member. Therefore, the biasing member 140 of the sealing device 10 can reduce the decline in the function of biasing the second seal lip 112 toward the shaft 20, compared to a metal spring biasing member. That is, in the sealing device 10, compared to the sealing device of Comparative Example 2, it is possible to reduce the deterioration of the sealing performance of the second seal lip 112.

また、本実施形態では、ダストシールとして機能する第２シールリップ１１２とオイルシールとして機能する第４シールリップ１２２とが１つの本体部材１００に形成されるため、ダストシールとオイルシールとが異なる密封装置に形成される態様（以下、対比例３とも称する）に比べて、製品コスト等を低減することができる。具体的には、本実施形態では、対比例３に比べて、製品コスト、密封装置の装着スペース、密封装置を装着するための凹部（例えば、凹部３４）の加工工数および密封装置の装着工数等を低減することができる。また、本実施形態では、従来のダストシールが装着される位置に密封装置１０を装着することにより、対比例３に比べて、密封装置１０の交換作業にかかる工数を低減することができる。 Furthermore, in the present embodiment, the second seal lip 112 that functions as a dust seal and the fourth seal lip 122 that functions as an oil seal are formed on one main body member 100, so that the dust seal and the oil seal are provided in different sealing devices. Compared to the embodiment in which the structure is formed (hereinafter also referred to as Comparative Example 3), product costs and the like can be reduced. Specifically, in this embodiment, compared to Comparative Example 3, the product cost, the mounting space for the sealing device, the number of man-hours for machining the recess (for example, the recess 34) for mounting the sealing device, the number of man-hours for mounting the sealing device, etc. can be reduced. Furthermore, in this embodiment, by installing the sealing device 10 at the position where a conventional dust seal is installed, the number of man-hours required for replacing the sealing device 10 can be reduced compared to Comparative Example 3.

図２は、実施形態に係る密封装置１０の模式的断面図である。図２は、ハウジング３０に装着されていない状態における密封装置１０の模式的断面図を示す。図２に示す胴体部分１０２は、例えば、第１凹部１１０の底面と第２凹部１２０の底面との間に位置する本体部材１００の部分である。図２に示す例では、第２シールリップ１１２は、胴体部分１０２から、密封装置１０の中心に向かう半径方向Ｒと第１方向Ｄ１との間の方向に延在する。これにより、第２シールリップ１１２は、密封装置１０の半径方向Ｒに変形可能となる。また、第４シールリップ１２２は、胴体部分１０２から、密封装置１０の中心に向かう半径方向Ｒと第２方向Ｄ２との間の方向に延在する。これにより、第４シールリップ１２２は、密封装置１０の半径方向Ｒに変形可能となる。 FIG. 2 is a schematic cross-sectional view of the sealing device 10 according to the embodiment. FIG. 2 shows a schematic cross-sectional view of the sealing device 10 in a state where it is not attached to the housing 30. The body portion 102 shown in FIG. 2 is, for example, a portion of the body member 100 located between the bottom surface of the first recess 110 and the bottom surface of the second recess 120. In the example shown in FIG. 2, the second sealing lip 112 extends from the body portion 102 in a direction between the radial direction R towards the center of the sealing device 10 and the first direction D1. Thereby, the second seal lip 112 becomes deformable in the radial direction R of the sealing device 10. Additionally, the fourth sealing lip 122 extends from the body portion 102 in a direction between the radial direction R toward the center of the sealing device 10 and the second direction D2. Thereby, the fourth seal lip 122 becomes deformable in the radial direction R of the sealing device 10.

例えば、密封装置１０がハウジング３０に装着されていない状態では、第１凹部１１０の開口部における半径方向Ｒに沿う長さＬ１ｏは、密封装置１０がハウジング３０に装着された状態における第１凹部１１０の開口部の長さＬ１ｆ（図１の長さＬ１ｆ）より大きい。したがって、密封装置１０がハウジング３０に装着された状態では、付勢部材１４０は、半径方向Ｒに圧縮され、弾性変形する。このため、付勢部材１４０は、弾性変形により生じる弾性力によって、第２シールリップ１１２を軸２０側に押圧するとともに、第１シールリップ１１１をハウジング３０側に押圧する。この結果、第２シールリップ１１２のシール性が向上する。 For example, when the sealing device 10 is not attached to the housing 30, the length L1o along the radial direction R at the opening of the first recess 110 is equal to the length L1o of the first recess 110 when the sealing device 10 is attached to the housing 30. is larger than the length L1f of the opening (length L1f in FIG. 1). Therefore, when the sealing device 10 is attached to the housing 30, the biasing member 140 is compressed in the radial direction R and is elastically deformed. Therefore, the biasing member 140 presses the second seal lip 112 toward the shaft 20 and presses the first seal lip 111 toward the housing 30 by the elastic force generated by elastic deformation. As a result, the sealing performance of the second seal lip 112 is improved.

なお、密封装置１０の半径方向Ｒに沿う付勢部材１４０の幅Ｗ１は、密封装置１０の半径方向Ｒに沿う第２シールリップ１１２の幅Ｗ２より短い。このため、付勢部材１４０は、図１で説明したように、第１方向Ｄ１よりも、密封装置１０の半径方向Ｒ（より詳細には、密封装置１０の中心から外側に向かう半径方向Ｒ）に変形しやすくなる。 Note that the width W1 of the biasing member 140 along the radial direction R of the sealing device 10 is shorter than the width W2 of the second seal lip 112 along the radial direction R of the sealing device 10. For this reason, as explained in FIG. 1, the biasing member 140 is moved in the radial direction R of the sealing device 10 (more specifically, in the radial direction R outward from the center of the sealing device 10) rather than in the first direction D1. It becomes easier to deform.

また、密封装置１０がハウジング３０に装着されていない状態では、第２凹部１２０の開口部における半径方向Ｒに沿う長さＬ２ｏは、密封装置１０がハウジング３０に装着された状態における第２凹部１２０の開口部の長さＬ２ｆ（図１の長さＬ２ｆ）より大きい。したがって、密封装置１０がハウジング３０に装着された状態では、第４シールリップ１２２は、半径方向Ｒに弾性変形し、弾性変形により生じる弾性力によって、第４シールリップ１２２を軸２０側に押圧するとともに、第３シールリップ１２１をハウジング３０側に押圧する。この結果、第４シールリップ１２２のシール性が向上する。 Further, when the sealing device 10 is not attached to the housing 30, the length L2o along the radial direction R at the opening of the second recess 120 is equal to the length L2o of the second recess 120 when the sealing device 10 is attached to the housing 30 is larger than the length L2f of the opening (length L2f in FIG. 1). Therefore, when the sealing device 10 is attached to the housing 30, the fourth seal lip 122 is elastically deformed in the radial direction R, and the elastic force generated by the elastic deformation presses the fourth seal lip 122 toward the shaft 20. At the same time, the third seal lip 121 is pressed toward the housing 30 side. As a result, the sealing performance of the fourth seal lip 122 is improved.

また、第３シールリップ１２１の外径Ｌ３は、ハウジング３０の凹部３４の内径（中心軸Ｚから凹部３４の底面３４ｂｔまでの距離を２倍した値）より大きくてもよい。この場合、密封装置１０をハウジング３０の凹部３４に装着する際の締め代が確保される。 Further, the outer diameter L3 of the third seal lip 121 may be larger than the inner diameter of the recess 34 of the housing 30 (the value obtained by doubling the distance from the central axis Z to the bottom surface 34bt of the recess 34). In this case, a tightness margin is secured when the sealing device 10 is mounted in the recess 34 of the housing 30.

以上、本実施形態では、密封装置１０に含まれる環状の本体部材１００は、軸２０の中心軸Ｚに沿う第１方向Ｄ１に開口する第１凹部１１０と、第１方向Ｄ１と反対方向の第２方向Ｄ２に開口する第２凹部１２０とを有する。さらに、本体部材１００は、ハウジング３０と第１凹部１１０との間に位置し、ハウジング３０に接触する第１シールリップ１１１と、軸２０と第１凹部１１０との間に位置し、軸２０に対して摺動する第２シールリップ１１２とを有する。また、本体部材１００は、ハウジング３０と第２凹部１２０との間に位置し、ハウジング３０に接触する第３シールリップ１２１と、軸２０と第２凹部１２０との間に位置し、軸２０に対して摺動する第４シールリップ１２２とを有する。また、本体部材１００の第１凹部１１０の表面には、樹脂により形成された弾性体の付勢部材１４０が接合される。付勢部材１４０は、第１シールリップ１１１をハウジング３０側に付勢し、第２シールリップ１１２を軸２０側に付勢する。 As described above, in the present embodiment, the annular main body member 100 included in the sealing device 10 has a first recess 110 that opens in the first direction D1 along the central axis Z of the shaft 20, and a first recess 110 that opens in the first direction D1 along the central axis Z of the shaft 20, and a second recess that opens in the opposite direction to the first direction D1. It has a second recess 120 that opens in two directions D2. Further, the main body member 100 has a first seal lip 111 that is located between the housing 30 and the first recess 110 and contacts the housing 30, and a first seal lip 111 that is located between the shaft 20 and the first recess 110 and that is in contact with the shaft 20. It has a second seal lip 112 that slides against the second seal lip 112 . The main body member 100 also includes a third seal lip 121 that is located between the housing 30 and the second recess 120 and contacts the housing 30, and a third seal lip 121 that is located between the shaft 20 and the second recess 120 and that contacts the shaft 20. It has a fourth seal lip 122 that slides against the fourth seal lip 122. Further, a biasing member 140 made of an elastic body made of resin is bonded to the surface of the first recess 110 of the main body member 100. The biasing member 140 biases the first seal lip 111 toward the housing 30 and biases the second seal lip 112 toward the shaft 20 side.

本実施形態では、樹脂により形成された弾性体の付勢部材１４０が本体部材１００の第１凹部１１０の表面に接合されるため、第２シールリップ１１２は、第１方向Ｄ１への力に対する剛性が向上する。このため、第２シールリップ１１２は、密封装置１０が油圧を受けた場合、第１方向Ｄ１に変形するより、密封装置１０の半径方向Ｒに変形しやすくなる。これにより、本実施形態では、例えば、第２シールリップ１１２の隙間ＧＰへのはみ出し、および、第２シールリップ１１２の摺動面の磨耗を低減することができる。この結果、本実施形態では、密封装置１０の耐圧を向上させることができる。すなわち、本実施形態では、ダストシールとオイルシールとを１つの本体部材１００に形成した密封装置１０の耐圧を向上させることができる。 In this embodiment, since the biasing member 140 made of an elastic body made of resin is joined to the surface of the first recess 110 of the main body member 100, the second seal lip 112 has a rigidity against force in the first direction D1. will improve. Therefore, when the sealing device 10 receives hydraulic pressure, the second seal lip 112 deforms more easily in the radial direction R of the sealing device 10 than in the first direction D1. Thereby, in this embodiment, for example, protrusion of the second seal lip 112 into the gap GP and wear of the sliding surface of the second seal lip 112 can be reduced. As a result, in this embodiment, the pressure resistance of the sealing device 10 can be improved. That is, in this embodiment, the pressure resistance of the sealing device 10 in which the dust seal and the oil seal are formed in one main body member 100 can be improved.

［２．変形例］
以上に例示した実施形態は多様に変形され得る。前述の実施形態に適用され得る具体的な変形の態様を以下に例示する。以下の例示から任意に選択された２以上の態様を、相互に矛盾しない範囲で併合してもよい。 [2. Modified example]
The embodiments illustrated above may be modified in various ways. Specific modifications that can be applied to the above-described embodiments are illustrated below. Two or more aspects arbitrarily selected from the following examples may be combined to the extent that they do not contradict each other.

［変形例１］
上述した実施形態では、密封装置１０がハウジング３０に装着される態様を例示したが、本発明はこのような態様に限定されるものではない。例えば、図３に示す密封装置１０Ａは、軸２０に装着されてもよい。 [Modification 1]
In the embodiment described above, the sealing device 10 is attached to the housing 30, but the present invention is not limited to this embodiment. For example, the sealing device 10A shown in FIG. 3 may be mounted on the shaft 20.

図３は、変形例１に係る密封装置１０Ａが軸２０Ａに装着された状態を示す模式的断面図である。図１および図２で説明した要素と同様の要素については、同様の符号を付し、詳細な説明を省略する。例えば、機器１Ａ（全体は図示せず）は、ハウジング３０Ａ（「軸受部材」の一例）と、ハウジング３０Ａに設けられた軸孔３２Ａに挿入される軸２０Ａ（「軸部材」の一例）と、軸２０Ａの外周面に設けられた環状の凹部２４Ａに装着された環状の密封装置１０Ａとを有する。密封装置１０Ａは、密封装置１０と同様に、軸２０Ａとハウジング３０Ａの内周面との間の隙間ＧＰを密封する。なお、変形例１では、密封装置１０Ａが軸２０Ａに装着されるため、ハウジング３０Ａには図１に示した凹部３４は設けられない。 FIG. 3 is a schematic cross-sectional view showing a state in which a sealing device 10A according to Modification Example 1 is attached to a shaft 20A. Elements similar to those described in FIGS. 1 and 2 are designated by the same reference numerals, and detailed description thereof will be omitted. For example, the device 1A (not shown in its entirety) includes a housing 30A (an example of a "bearing member"), a shaft 20A (an example of a "shaft member") inserted into a shaft hole 32A provided in the housing 30A, It has an annular sealing device 10A attached to an annular recess 24A provided on the outer peripheral surface of the shaft 20A. Similar to the sealing device 10, the sealing device 10A seals the gap GP between the shaft 20A and the inner peripheral surface of the housing 30A. In Modification 1, the sealing device 10A is attached to the shaft 20A, so the housing 30A is not provided with the recess 34 shown in FIG. 1.

密封装置１０Ａは、第１方向Ｄ１に開口する第１凹部１１０Ａ、および、第２方向Ｄ２に開口する第２凹部１２０Ａを有する環状の本体部材１００Ａと、第１凹部１１０Ａの表面に接合された付勢部材１４０Ａとを有する。本体部材１００Ａの材料としては、本体部材１００と同様に、例えば、ウレタン樹脂およびフッ素樹脂等の弾性材料が挙げられる。また、付勢部材１４０Ａの材料としては、付勢部材１４０と同様に、例えば、ナイロン樹脂等の硬質の弾性材料が挙げられる。付勢部材１４０Ａは、本体部材１００Ａの第１凹部１１０Ａの表面と接着されてもよいし、本体部材１００Ａの第１凹部１１０Ａの表面と融着されてもよい。 The sealing device 10A includes an annular main body member 100A having a first recess 110A opening in a first direction D1 and a second recess 120A opening in a second direction D2, and an attachment joined to the surface of the first recess 110A. It has a biasing member 140A. Like the main body member 100, examples of the material of the main body member 100A include elastic materials such as urethane resin and fluororesin. Further, as the material of the biasing member 140A, similar to the biasing member 140, for example, a hard elastic material such as nylon resin can be used. The biasing member 140A may be adhered to the surface of the first recess 110A of the main body member 100A, or may be fused to the surface of the first recess 110A of the main body member 100A.

また、本体部材１００Ａは、軸２０Ａと第１凹部１１０Ａとの間に位置し、軸２０Ａに設けられた凹部２４Ａの底面２４Ａｂｔに接触する第１シールリップ１１１Ａ（「第１部分」の一例）と、ハウジング３０Ａと第１凹部１１０Ａとの間に位置し、第１凹部１１０Ａの内周面に対して摺動する第２シールリップ１１２Ａ（「第２部分」の一例）とを有する。さらに、本体部材１００Ａは、軸２０Ａと第２凹部１２０Ａとの間に位置し、軸２０Ａに設けられた凹部２４Ａの底面２４Ａｂｔに接触する第３シールリップ１２１Ａ（「第３部分」の一例）と、ハウジング３０Ａと第２凹部１２０Ａとの間に位置し、ハウジング３０Ａの内周面に対して摺動する第４シールリップ１２２Ａ（「第４部分」の一例）とを有する。 The main body member 100A also includes a first seal lip 111A (an example of a "first portion") that is located between the shaft 20A and the first recess 110A and contacts the bottom surface 24Abt of the recess 24A provided in the shaft 20A. , a second seal lip 112A (an example of a "second portion") that is located between the housing 30A and the first recess 110A and slides on the inner circumferential surface of the first recess 110A. Furthermore, the main body member 100A includes a third seal lip 121A (an example of a "third portion") that is located between the shaft 20A and the second recess 120A and contacts the bottom surface 24Abt of the recess 24A provided in the shaft 20A. , a fourth seal lip 122A (an example of a "fourth portion") that is located between the housing 30A and the second recess 120A and slides on the inner circumferential surface of the housing 30A.

また、付勢部材１４０Ａは、第１シールリップ１１１Ａを軸２０Ａ側に付勢し、第２シールリップ１１２Ａをハウジング３０Ａ側に付勢する。また、図３に示す変形例１においても、密封装置１０Ａの半径方向Ｒに沿う付勢部材１４０Ａの幅Ｗ１は、密封装置１０Ａの半径方向Ｒに沿う第２シールリップ１１２Ａの幅Ｗ２より短い。このため、変形例１においても、付勢部材１４０Ａは、第１方向Ｄ１よりも、密封装置１０Ａの半径方向Ｒ（より詳細には、密封装置１０Ａの中心から外側に向かう半径方向Ｒ）に変形しやすくなる。 Further, the biasing member 140A biases the first seal lip 111A toward the shaft 20A and biases the second seal lip 112A toward the housing 30A. Also in the first modification shown in FIG. 3, the width W1 of the biasing member 140A along the radial direction R of the sealing device 10A is shorter than the width W2 of the second seal lip 112A along the radial direction R of the sealing device 10A. Therefore, in Modification 1 as well, the biasing member 140A deforms in the radial direction R of the sealing device 10A (more specifically, in the radial direction R outward from the center of the sealing device 10A) rather than in the first direction D1. It becomes easier to do.

変形例１においても、樹脂により形成された弾性体の付勢部材１４０Ａが本体部材１００Ａの第１凹部１１０Ａの表面に接合されるため、上述した実施形態と同様の効果を得ることができる。 Also in the first modification, since the biasing member 140A made of an elastic body made of resin is joined to the surface of the first recess 110A of the main body member 100A, the same effects as in the embodiment described above can be obtained.

また、第３シールリップ１２１の内径は、軸２０Ａに設けられた凹部２４Ａの内径（中心軸Ｚから凹部２４Ａの底面２４Ａｂｔまでの距離を２倍した値）より小さくてもよい。この場合、密封装置１０Ａを軸２０Ａに設けられた凹部２４Ａに装着する際の締め代が確保される。 Further, the inner diameter of the third seal lip 121 may be smaller than the inner diameter of the recess 24A provided in the shaft 20A (the value obtained by doubling the distance from the central axis Z to the bottom surface 24Abt of the recess 24A). In this case, a tightness margin is secured when the sealing device 10A is installed in the recess 24A provided in the shaft 20A.

１…機器、１０、１０Ａ…密封装置、２０、２０Ａ…軸、２４…凹部、２４ｂｔ…底面、３０、３０Ａ…ハウジング、３２…軸孔、３４…凹部、３４ｂｔ…底面、１００、１００Ａ…本体部材、１０２…胴体部分、１１０、１１０Ａ…第１凹部、１１０Ａ…本体部材１００Ａの第１凹部、１１１、１１１Ａ…第１シールリップ、１１２、１１２Ａ…第２シールリップ、１１２ｅｄ…端部、１２０、１２０Ａ…第２凹部、１２１、１２１Ａ…第３シールリップ、１２２、１２２Ａ…第４シールリップ、１４０、１４０Ａ…付勢部材、Ｄ１…第１方向、Ｄ２…第２方向、ＧＰ…隙間、Ｒ１、Ｒ２…半径方向。 1...Equipment, 10, 10A...Sealing device, 20, 20A...Shaft, 24...Recess, 24bt...Bottom surface, 30, 30A...Housing, 32...Shaft hole, 34...Recess, 34bt...Bottom surface, 100, 100A...Body member , 102... body portion, 110, 110A... first recess, 110A... first recess of main body member 100A, 111, 111A... first seal lip, 112, 112A... second seal lip, 112ed... end, 120, 120A ...Second recess, 121, 121A...Third seal lip, 122, 122A...Fourth seal lip, 140, 140A...Biasing member, D1...First direction, D2...Second direction, GP...Gap, R1, R2 ...radial direction.

Claims (4)

軸部材と、前記軸部材が挿入される軸孔が設けられた軸受部材の内周面との間の隙間を密封する密封装置であって、
前記軸部材の軸に沿う第１方向に開口する第１凹部、および、前記第１方向と反対方向の第２方向に開口する第２凹部を有する環状の本体部材と、
前記第１凹部および前記第２凹部のうちの前記第１凹部のみに設けられ、前記第１凹部の表面に接合された付勢部材とを備え、
前記本体部材は、
前記軸受部材と前記第１凹部との間に位置し、前記軸受部材に接触する第１部分と、
前記軸部材と前記第１凹部との間に位置し、前記軸部材に対して摺動する第２部分と、
前記軸受部材と前記第２凹部との間に位置し、前記軸受部材に接触する第３部分と、
前記軸部材と前記第２凹部との間に位置し、前記軸部材に対して摺動する第４部分とを備え、
前記付勢部材は、
樹脂により形成された弾性体であり、
前記第１部分を前記軸受部材側に付勢し、
前記第２部分を前記軸部材側に付勢すし、
前記第１方向は、
前記密封装置が前記軸受部材に装着された状態において、前記軸部材の軸に沿う方向のうち、前記密封装置から大気側に向かう方向である
ことを特徴とする密封装置。 A sealing device that seals a gap between a shaft member and an inner peripheral surface of a bearing member provided with a shaft hole into which the shaft member is inserted,
an annular main body member having a first recess that opens in a first direction along the axis of the shaft member, and a second recess that opens in a second direction opposite to the first direction;
a biasing member provided only in the first recess of the first recess and the second recess, and joined to a surface of the first recess;
The main body member is
a first portion located between the bearing member and the first recess and in contact with the bearing member;
a second portion located between the shaft member and the first recess and sliding with respect to the shaft member;
a third portion located between the bearing member and the second recess and in contact with the bearing member;
a fourth portion located between the shaft member and the second recess and sliding with respect to the shaft member;
The biasing member is
It is an elastic body made of resin,
urging the first portion toward the bearing member;
urging the second portion toward the shaft member;
The first direction is
A sealing device characterized in that, in a state where the sealing device is attached to the bearing member, the direction is a direction from the sealing device toward the atmosphere among directions along the axis of the shaft member. 軸部材と、前記軸部材が挿入される軸孔が設けられた軸受部材の内周面との間の隙間を密封する密封装置であって、
前記軸部材の軸に沿う第１方向に開口する第１凹部、および、前記第１方向と反対方向の第２方向に開口する第２凹部を有する環状の本体部材と、
前記第１凹部および前記第２凹部のうちの前記第１凹部のみに設けられ、前記第１凹部の表面に接合された付勢部材とを備え、
前記本体部材は、
前記軸部材と前記第１凹部との間に位置し、前記軸部材に接触する第１部分と、
前記軸受部材と前記第１凹部との間に位置し、前記軸受部材に対して摺動する第２部分と、
前記軸部材と前記第２凹部との間に位置し、前記軸部材に接触する第３部分と、
前記軸受部材と前記第２凹部との間に位置し、前記軸受部材に対して摺動する第４部分とを備え、
前記付勢部材は、
樹脂により形成された弾性体であり、
前記第１部分を前記軸部材側に付勢し、
前記第２部分を前記軸受部材側に付勢し、
前記第１方向は、
前記密封装置が前記軸部材に装着された状態において、前記軸部材の軸に沿う方向のうち、前記密封装置から大気側に向かう方向である
ことを特徴とする密封装置。 A sealing device that seals a gap between a shaft member and an inner peripheral surface of a bearing member provided with a shaft hole into which the shaft member is inserted,
an annular main body member having a first recess that opens in a first direction along the axis of the shaft member, and a second recess that opens in a second direction opposite to the first direction;
a biasing member provided only in the first recess of the first recess and the second recess, and joined to a surface of the first recess;
The main body member is
a first portion located between the shaft member and the first recess and in contact with the shaft member;
a second portion located between the bearing member and the first recess and sliding with respect to the bearing member;
a third portion located between the shaft member and the second recess and in contact with the shaft member;
a fourth portion located between the bearing member and the second recess and sliding with respect to the bearing member;
The biasing member is
It is an elastic body made of resin,
urging the first portion toward the shaft member;
urging the second portion toward the bearing member;
The first direction is
A sealing device characterized in that, in a state where the sealing device is attached to the shaft member , the direction is a direction from the sealing device toward the atmosphere side among the directions along the axis of the shaft member. 前記樹脂は、ナイロン樹脂である
ことを特徴とする請求項１または２に記載の密封装置。 The sealing device according to claim 1 or 2, wherein the resin is a nylon resin. 前記本体部材の半径方向に沿う前記付勢部材の幅は、前記本体部材の半径方向に沿う前記第２部分の幅より短い
ことを特徴とする請求項１から３のいずれか１項に記載の密封装置。
 The width of the biasing member along the radial direction of the main body member is shorter than the width of the second portion along the radial direction of the main body member. Sealing device.
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JPS6430974A (en) * 1987-07-23 1989-02-01 Koyo Seiko Co Oil seal for hydraulic clutch device
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JP2013040683A (en) 2011-08-15 2013-02-28 Elringklinger Ag Seal for sealing sealing gap and manufacturing method of seal of this type
JP2015194217A (en) 2014-03-31 2015-11-05 カヤバ工業株式会社 seal ring
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