JP4695611B2 - Sealing device - Google Patents

Sealing device Download PDF

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JP4695611B2
JP4695611B2 JP2007013542A JP2007013542A JP4695611B2 JP 4695611 B2 JP4695611 B2 JP 4695611B2 JP 2007013542 A JP2007013542 A JP 2007013542A JP 2007013542 A JP2007013542 A JP 2007013542A JP 4695611 B2 JP4695611 B2 JP 4695611B2
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seal
outer member
sealing
seal lip
metal
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JP2008180267A (en
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義信 上野
雅樹 宗田
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Arai Seisakusho Co Ltd
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Arai Seisakusho Co Ltd
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Description

本発明は、密封流体の漏洩防止に用いられる密封装置に関する。   The present invention relates to a sealing device used for preventing leakage of a sealing fluid.

従来、密封流体の漏洩防止に用いられる密封装置においては、回転軸とシールリップとの間に生じる摩擦トルクを低減するために、シールリップにフッ素系樹脂を接着したものが知られている（特許文献１）。
特開２００６ー１５３２０９号公報 Conventionally, a sealing device used for preventing leakage of a sealing fluid is known in which a fluororesin is bonded to a seal lip in order to reduce a friction torque generated between a rotating shaft and the seal lip (patent) Reference 1).
JP 2006-153209 A

上記した特許文献1に記載されるような従来の密封装置では、フッ素系樹脂によってトルクの低減は可能となるものの、フッ素系樹脂はゴムに比べて硬質であるため、十分なシール性を確保することが難しいという問題がある。   In the conventional sealing device as described in Patent Document 1 described above, although the torque can be reduced by the fluorine-based resin, the fluorine-based resin is harder than rubber, so that sufficient sealing performance is ensured. There is a problem that it is difficult.

本発明は、上記した従来のフッ素系樹脂を用いたシールの問題点に鑑みてなされたもので、充分なシール性を確保し、且つトルクの低減を図った密封装置の提供を目的とするものである。   The present invention has been made in view of the problems of sealing using the above-mentioned conventional fluororesin, and aims to provide a sealing device that ensures sufficient sealing performance and reduces torque. It is.

本発明に係る密封装置は、回転軸と一体に回転するシール部材と金属製補強環とから構成される内側部材と、ハウジングに固定された外側部材とを有し、前記シール部には上記外側部材の内摺面側に弾性的摺接する弾性体製のシールリップを設け、該シールリップは、前記外側部材との摺接面にはフッ素系樹脂シートを備えるとともに、該フッ素系樹脂シートは前記シール部材に埋設される金属製補強環の折り曲げ底部にのみに固定され、それに連なる外側部材側の立ち上げ部及び折り曲げ棚部は添接状態とし、該シールリップは軸の回転時の遠心力によって前記外側部材の内周面に押し付けられるように作動する構成としたことをその特徴とするものである。 A sealing device according to the present invention includes an inner member composed of a seal member that rotates integrally with a rotating shaft and a metal reinforcing ring, and an outer member fixed to a housing, and the seal portion includes the outer member. a sealing lip on the inner sliding surface side elastic sliding contact with the elastic body made of a member provided, the seal lip, the with the sliding contact surface between the outer member comprises a fluorine-based resin sheet, the fluorine-based resin sheet wherein It is fixed only to the bent bottom of the metal reinforcement ring embedded in the seal member . It is characterized in that it is configured to operate so as to be pressed against the inner peripheral surface of the outer member.

本発明に係る密封装置は、回転軸と一体に回転する内側部材と、ハウジングに固定される外側部材とを備え、前記内側部材には前記外側部材の内周面に弾性的に摺接するゴム等の弾性材製のシールリップを設け、該シールリップは、前記内側部材の回転時の遠心力によって前記外側部材の内周面に押し付けられるように作動するようにしたので、回転軸の高速化に対応するシール性の向上が図れるとともに、前記外側部材との摺接面側にフッ素系樹脂層を設けてあるため回転時の摩擦抵抗が小となり、トルクが低減される効果を有するものである。   A sealing device according to the present invention includes an inner member that rotates integrally with a rotating shaft, and an outer member that is fixed to a housing, and the inner member has rubber or the like that elastically slides on the inner peripheral surface of the outer member. The seal lip made of elastic material is provided, and the seal lip is operated so as to be pressed against the inner peripheral surface of the outer member by the centrifugal force when the inner member rotates. The corresponding sealability can be improved, and since the fluorine-based resin layer is provided on the slidable contact surface side with the outer member, the frictional resistance during rotation is reduced, and the torque is reduced.

また、本発明においては、シールリップが摺接する外側部材の内周面に、密封側への吸い込み方向へのリードを形成することで、回転時のポンプ効果により、さらにシール性が向上するものであり、加えて、本発明では、フッ素系樹脂シートは内側部材の金属製補強環と完全に接着しない構成としたので，フッ素系樹脂シートの形状や柔軟性が確保でき、回転軸に対する追随性が向上するものである。また、前記のフッ素系樹脂シートを延伸処理を施したことで、フッ素系樹脂シートの柔軟性が増大し追随性がさらに向上するとともに、形状記憶効果が生まれ、応答性も向上するとする効果を奏するものである。そして、フッ素系樹脂シートは、延伸処理により微細な孔を有する多孔質構造となり、その微細な孔に密封流体が浸透しこれを保持し易くなるので，耐摩耗性が向上するとともに、一層のトルク低減効果が得られるものである。
このように、本発明によれば、充分なシール性を確保し、かつトルクを低減した密封装置を提供することができたものである。 Further, in the present invention, by forming a lead in the suction direction toward the sealing side on the inner peripheral surface of the outer member that is in sliding contact with the seal lip, the sealing performance is further improved by the pump effect during rotation. In addition, in the present invention, since the fluororesin sheet is configured not to completely adhere to the metal reinforcing ring of the inner member, the shape and flexibility of the fluororesin sheet can be secured, and the followability to the rotating shaft can be ensured. It will improve. In addition, by subjecting the fluororesin sheet to the stretching treatment, the flexibility of the fluororesin sheet is increased, the followability is further improved, the shape memory effect is produced, and the responsiveness is improved. Is. The fluororesin sheet has a porous structure having fine pores due to the stretching process, and the sealing fluid penetrates into the fine pores, making it easier to hold it. This improves wear resistance and further increases torque. A reduction effect can be obtained.
As described above, according to the present invention, it is possible to provide a sealing device that ensures sufficient sealing performance and reduces torque.

本発明の密封装置の実施の形態を説明すると、図１に示す密封装置は、回転軸１に嵌着され該回転軸１と一体となって回転する内側部材２とハウジング１６に固定される環状の外側部材１５とを備えて構成される。   An embodiment of the sealing device of the present invention will be described. The sealing device shown in FIG. 1 is an annular member that is fitted to a rotary shaft 1 and is fixed to an inner member 2 that rotates integrally with the rotary shaft 1 and a housing 16. The outer member 15 is configured.

前記した内側部材２は、金属製補強環３とシール部8とより構成され、前記金属製補強環３は、軸と平行な立ち上げ基部４の底部より軸に直角な方向に外方に折り曲げし、該折り曲げ底部５の先端部を少しばかり立ち上げて立ち上げ部６とし、その先端部は外方に直角方向に折り曲げ棚部７を形成し、前記折り曲げ棚部７は後述するシールリップ１０の支持部としての作用をするように構成される。   The inner member 2 is composed of a metal reinforcing ring 3 and a seal portion 8, and the metal reinforcing ring 3 is bent outward in a direction perpendicular to the axis from the bottom of the rising base 4 parallel to the axis. Then, the front end of the bent bottom 5 is slightly raised to form a raised portion 6, and the front end forms a folding shelf 7 in the direction perpendicular to the outside. The folding shelf 7 is a seal lip 10 which will be described later. It is comprised so that it may act as a support part.

前記した回転軸１とともに回転するゴム等の弾性材よりなるシール部8は、回転軸１に嵌着される基部９と、該基部９より外方に延出されるシールリップ１０より構成され、前記基部９に前記した金属製補強環３の立ち上げ基部４が埋設されて加硫接着される。前記したシールリップ１０の基部９からの延出部の密封側は、前記した金属製補強環３の折り曲げ底部５の上面、立ち上げ部６に沿うような形状で延出され、前記金属製補強環３の折り曲げ棚部７の上面にシールリップ１０の基部に連なる平坦部１１が載せられるように構成されている。そして、本実施の形態において前記したシールリップ１０の外周側にフッ素系樹脂層１２を備えている。   The sealing portion 8 made of an elastic material such as rubber that rotates together with the rotating shaft 1 includes a base portion 9 fitted to the rotating shaft 1 and a seal lip 10 extending outward from the base portion 9. The raised base 4 of the metal reinforcing ring 3 is embedded in the base 9 and vulcanized and bonded. The sealing side of the extending portion from the base portion 9 of the sealing lip 10 is extended in a shape along the upper surface of the bent bottom portion 5 and the rising portion 6 of the metallic reinforcing ring 3, and the metallic reinforcing portion is provided. A flat portion 11 connected to the base portion of the seal lip 10 is placed on the upper surface of the folding shelf portion 7 of the ring 3. And in this Embodiment, the fluororesin layer 12 is provided in the outer peripheral side of the above-mentioned seal lip 10.

前記した外側部材１５は、環状の金属製シール部１６と該金属製シール部１６に加硫接着されハウジング１６に固定されるゴム状弾性材１７とよりなり、前記外側部材１５の金属製シール部１６の内周シール面１８に前記したシールリップ１０の先端部が所要の締代で弾性的に摺接することにより、密封流体であるオイルが密封され、密封側ＯＳと大気側ＡＳの間を密封するものである。   The outer member 15 includes an annular metal seal portion 16 and a rubber-like elastic material 17 that is vulcanized and bonded to the metal seal portion 16 and fixed to the housing 16, and the metal seal portion of the outer member 15. When the tip of the sealing lip 10 is slidably contacted with the inner peripheral sealing surface 18 at a required tightening margin, oil as a sealing fluid is sealed, and the sealing side OS and the atmosphere side AS are sealed. To do.

前記したように、シールリップ１０の外側部材15の金属製シール部１６の摺動面側にフッ素系樹脂層１２を備えており、該フッ素系樹脂層１２は、シールリップ１０に加硫接着される延伸処理を施されたポリテトラフルオロエチレン（ＰＴＦＥ）シートからなり、該ポリテトラフルオロエチレンシートを介して前記したシールリップ１０が外側部材１５の金属製シール部１６の内周シール面と摺接するものであり、このポリテトラフルオロエチレンシートの滑性によって回転時の摩擦抵抗が小となり、トルクが低減されるものである。なお、このポリテトラフルオロエチレンシートとしては、充填剤入りのポリテトラフルオロエチレンシートが好適に用いられる。   As described above, the fluororesin layer 12 is provided on the sliding surface side of the metal seal portion 16 of the outer member 15 of the seal lip 10, and the fluororesin layer 12 is vulcanized and bonded to the seal lip 10. The sealing lip 10 is in sliding contact with the inner peripheral sealing surface of the metal seal portion 16 of the outer member 15 through the polytetrafluoroethylene (PTFE) sheet. The frictional resistance at the time of rotation is reduced by the lubricity of the polytetrafluoroethylene sheet, and the torque is reduced. In addition, as this polytetrafluoroethylene sheet, a polytetrafluoroethylene sheet containing a filler is preferably used.

上記した本実施の態様においては、回転軸１が回転され、該回転軸１とともに回転する内側部材２のシールリップ１０は、その密封作動時に、前記したように回転軸１の回転とともに回転される内側部材２に設けられているので、該回転時の遠心力によって外側部材１５の金属製シール部１６のシール面１８に押し付けられるように作動するように構成されている。すなわち、回転軸１には内側部材２のシール部８の基部９が嵌合固定されており、該内側部材２は回転軸１の回転に伴って一体と回転するので、この回転によってシールリップ１０は遠心力によって外側に開くように弾性変形する力が作用して外側部材１５の金属製シール部１６の内周面に強く押しつけられる状態で摺動し、回転速度が上昇するにしたがって強い力で押しつけられて締代が増大することになり、この作用によってシール性の向上が図られることになる。   In the above-described embodiment, the rotary shaft 1 is rotated, and the seal lip 10 of the inner member 2 that rotates together with the rotary shaft 1 is rotated with the rotation of the rotary shaft 1 as described above during the sealing operation. Since it is provided in the inner member 2, it is configured to operate so as to be pressed against the seal surface 18 of the metal seal portion 16 of the outer member 15 by the centrifugal force during the rotation. That is, the base portion 9 of the seal portion 8 of the inner member 2 is fitted and fixed to the rotary shaft 1, and the inner member 2 rotates integrally with the rotation of the rotary shaft 1, so that the seal lip 10 is rotated by this rotation. Is slid in a state where it is strongly pressed against the inner peripheral surface of the metal seal portion 16 of the outer member 15 due to the force of elastic deformation so as to open outward by centrifugal force, and the force increases as the rotational speed increases. When pressed, the tightening margin increases, and this action improves the sealing performance.

また、本実施の態様においては、前記した外側部材１５の金属製シール部１６の内周シール面１８に、シールリップ１０が摺接する周辺の範囲部２０に、密封側ＯＳへの吸い込み方向のリード２１を形成する。該リード２１の形状の例を図２に示すが、この例では、シールリップ１０が摺接する外側部材１５の金属製シール部１６のシール面18に吸い込み方向へのリードとしてスパイラル状のリブ２２を形成してある。このようなスパイラル状のリブ２２を形成したことにより、回転軸１の回転時には漏洩しようとするオイルを密封側に吸い込むポンプ効果を生じ、これによりさらにシール性を向上させることができる。また、図3に示すような前記した外側部材１５の金属製シール部１６のシール面１８に吸い込み方向へのリードとして斜行する溝２３を多数設けても同様な効果を得ることができる。   Further, in this embodiment, the lead in the suction direction to the sealing side OS is provided in the peripheral range portion 20 where the seal lip 10 is slidably contacted with the inner peripheral seal surface 18 of the metal seal portion 16 of the outer member 15 described above. 21 is formed. An example of the shape of the lead 21 is shown in FIG. 2. In this example, a spiral rib 22 is used as a lead in the suction direction on the seal surface 18 of the metal seal portion 16 of the outer member 15 with which the seal lip 10 is in sliding contact. It is formed. By forming such a spiral rib 22, a pumping effect of sucking oil to be leaked to the sealing side when the rotating shaft 1 rotates is produced, and thus the sealing performance can be further improved. Further, the same effect can be obtained by providing a large number of grooves 23 that are inclined as leads in the suction direction on the seal surface 18 of the metal seal portion 16 of the outer member 15 as shown in FIG.

本実施の態様においては、内側部材２のシール部８の基部9より外方に向かって延出されるシールリップ１０に接着されるポリテトラフルオロエチレンシート１２は、その基部側が金属製補強環３の折り曲げ底部5の上面に固定状態とされているが、金属製補強環３の立ち上げ部６及びその先端部を外方に折曲した折り曲げ部７の部位においては、ポリテトラフルオロエチレンシート１２は金属製補強環３とは接着されることなく単に添接された状態とされ、前記金属製補強環３の折り曲げ棚部７の上面にシールリップ１０の基部に連なる平坦部１１が載せられるような状態に構成されている。   In this embodiment, the polytetrafluoroethylene sheet 12 bonded to the seal lip 10 extending outward from the base 9 of the seal portion 8 of the inner member 2 has a base side of the metal reinforcing ring 3. Although it is fixed to the upper surface of the bent bottom 5, the polytetrafluoroethylene sheet 12 is formed at the site of the raised portion 6 of the metal reinforcing ring 3 and the bent portion 7 where the tip end portion is bent outward. The metal reinforcing ring 3 is simply joined without being bonded, and the flat portion 11 connected to the base of the seal lip 10 is placed on the upper surface of the folding shelf 7 of the metal reinforcing ring 3. Configured to state.

上記したように、本実施の態様においてポリテトラフルオロエチレンシート１２と金属製補強環３とを完全に接着しない構成したことにより、ポリテトラフルオロエチレンシート１２は形状柔軟性を確保することができるので、回転軸１に多少の偏心があってもこれに追随して外側部材１５の金属製シール部１６のシール面18に確実に摺接するという、追随性の向上が図れるものである。   As described above, since the polytetrafluoroethylene sheet 12 and the metal reinforcing ring 3 are not completely bonded in the present embodiment, the polytetrafluoroethylene sheet 12 can ensure flexibility in shape. Even if there is a slight eccentricity in the rotating shaft 1, the followability can be improved by following this and surely making sliding contact with the seal surface 18 of the metal seal portion 16 of the outer member 15.

さらに、本実施の形態においては、前記したポリテトラフルオロエチレンシート１２は、延伸処理を施したものを使用している。これは、シート状に成形したポリテトラフルオロエチレンに引張力を加えてさらに面方向に延伸させたものでこの延伸処理を施したことによりポリテトラフルオロエチレンシートは、ばね性が増加して、追従性が向上するものである。また、ポリテトラフルオロエチレンシートは、延伸処理によって形状記憶効果が生まれるので、回転速度の低下時にはシールリップ１０がスムーズに初期状態に復帰するように動作するという応答性の向上が図れるものである。   Furthermore, in this Embodiment, the above-mentioned polytetrafluoroethylene sheet 12 uses what performed the extending | stretching process. This is a polytetrafluoroethylene molded into a sheet shape, which is stretched in the surface direction by applying a tensile force. By applying this stretching treatment, the polytetrafluoroethylene sheet has increased springiness and follows up. The property is improved. In addition, since the polytetrafluoroethylene sheet has a shape memory effect due to the stretching process, it is possible to improve the responsiveness such that the seal lip 10 smoothly returns to the initial state when the rotational speed is reduced.

本発明の密封装置の半断面図。The half sectional view of the sealing device of the present invention. 外側部材の密封面に形成するリードの形状の説明図。Explanatory drawing of the shape of the lead formed in the sealing surface of an outer side member. 外側部材の密封面に形成するリードの他の形状の説明図。Explanatory drawing of the other shape of the lead formed in the sealing surface of an outer member.

符号の説明Explanation of symbols

１ 回転軸
２ 内側部材
３ 金属製補強環
１０ シールリップ
１２ フッ素系樹脂層
１５ 外側部材
１６ 金属製シール部
２１ リード DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Inner member 3 Metal reinforcement ring 10 Seal lip 12 Fluorine resin layer 15 Outer member 16 Metal seal part 21 Lead

Claims (1)

回転軸と一体に回転するシール部材と金属製補強環とから構成される内側部材と、ハウジングに固定された外側部材とを有し、前記シール部には上記外側部材の内摺面に弾性的に摺接する弾性体製のシールリップを設け、該シールリップは、前記外側部材との摺接面側にフッ素系樹脂シートを備えるとともに、該フッ素系樹脂シートは前記シール部材に埋設される金属製補強環の折り曲げ底部にのみに固定され、それに連なる外側部材側の立ち上げ部及び折り曲げ棚部は添接状態とし、該シールリップは軸の回転時の遠心力によって前記外側部材の内周面に押し付けられるように作動する構成としたことを特徴とする密封装置。 An inner member composed of a seal member that rotates integrally with the rotation shaft and a metal reinforcing ring; and an outer member fixed to the housing; and the seal portion is elastic to an inner sliding surface of the outer member. A seal lip made of an elastic material that is in sliding contact with the outer member, and the seal lip is provided with a fluorine resin sheet on a sliding contact surface side with the outer member, and the fluorine resin sheet is made of metal embedded in the seal member It is fixed only to the bent bottom of the reinforcing ring. A sealing device characterized by being configured to operate so as to be pressed.
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JPS61501332A (en) * 1984-03-08 1986-07-03 フエデラル−モガル　コ−ポレ−シヨン Rotating Lip Bidirectional Fluid Oil Seal
JPH0259367U (en) * 1988-10-25 1990-04-27
JPH061932U (en) * 1992-06-11 1994-01-14 内山工業株式会社 Oil seal
JP2003336748A (en) * 2002-05-20 2003-11-28 Mitsubishi Cable Ind Ltd Oil seal

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61501332A (en) * 1984-03-08 1986-07-03 フエデラル−モガル　コ−ポレ−シヨン Rotating Lip Bidirectional Fluid Oil Seal
JPH0259367U (en) * 1988-10-25 1990-04-27
JPH061932U (en) * 1992-06-11 1994-01-14 内山工業株式会社 Oil seal
JP2003336748A (en) * 2002-05-20 2003-11-28 Mitsubishi Cable Ind Ltd Oil seal

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