JP2008309273A - Sealing device - Google Patents

Sealing device Download PDF

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Publication number
JP2008309273A
JP2008309273A JP2007158931A JP2007158931A JP2008309273A JP 2008309273 A JP2008309273 A JP 2008309273A JP 2007158931 A JP2007158931 A JP 2007158931A JP 2007158931 A JP2007158931 A JP 2007158931A JP 2008309273 A JP2008309273 A JP 2008309273A
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Prior art keywords
shaft
lip
protrusions
sub lip
sub
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JP2007158931A
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JP4850787B2 (en
Inventor
Shinya Seki
信也 関
Masamoto Nakajima
雅元 中島
Masakazu Amano
正和 天野
Hideya Yamamori
秀哉 山森
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Arai Seisakusho Co Ltd
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Arai Seisakusho Co Ltd
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  • Sealing With Elastic Sealing Lips (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device having reduced friction against a shaft while avoiding negative pressure in an annular space formed between a main lip and a sub lip. <P>SOLUTION: The main lip 4 on the seal side and the sub lip 5 on the atmosphere side are integrally formed of a rubber elastic body. Protrusions 14 are provided at a plurality of positions on the front end inner peripheral face of the sub lip for avoiding negative pressure in the annular space formed between both lips during the rotation of the shaft 3. The number of the protrusions at the plurality of positions equally spaced in the rotating direction of the shaft is an odd number. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、例えばオイルシール等の密封装置において、軸の回転に伴い密封流体側の主リップと大気側の副リップとの間に生じる環状空間に負圧が生じたとき、前記の両リップが互いに引き寄せられる状態となり、軸に対して過大な接触圧を発生させることを防止するようにした密封装置に関する。   In the sealing device such as an oil seal, for example, when negative pressure is generated in the annular space generated between the main lip on the sealing fluid side and the sub lip on the atmosphere side as the shaft rotates, both the lips are The present invention relates to a sealing device that is in a state of being attracted to each other and prevents an excessive contact pressure from being generated on a shaft.

従来、密封流体側の主リップと大気側の副リップ(ダストリップ)を備え、これらの主リップ及び副リップがゴム状弾性体で一体的に成形されたオイルシールにおいては、前記した両リップ間に形成される環状空間内の流体は、主リップの密封作用により主リップの内側に吸い込み作用を受けることになり、負圧が発生するがこのとき副リップが軸と密封接触しているため前記の環状空間内には流体が流入することがないので前記の空間内の負圧は増大することになり、この負圧によって両リップは環状空間に向かって引き寄せられ、軸に対する接触圧が増し、その結果リップの軸に接触する部位が発熱等を生じシール性に問題が生じることになる。   Conventionally, in an oil seal having a main lip on the sealing fluid side and a sub lip (dust lip) on the atmosphere side, and these main lip and sub lip are integrally formed of a rubber-like elastic body, The fluid in the annular space formed in the cylinder is sucked into the main lip due to the sealing action of the main lip, and negative pressure is generated. Since no fluid flows into the annular space, the negative pressure in the space increases, and this negative pressure pulls both lips toward the annular space, increasing the contact pressure on the shaft, As a result, the portion that contacts the shaft of the lip generates heat and causes a problem in sealing performance.

上記した問題点を解決するため副リップの軸と接面する周側面に複数の突起を設けることによって軸の周面と突起部と突起部の側面との間に通路が形成され、副リップのシール部は軸より離間するので、大気側と環状空間内とは連通し負圧は解消されるものが提案されている(特許文献1参照)。
実公昭62ー12933号公報
In order to solve the above-described problems, a plurality of protrusions are provided on the peripheral side surface that contacts the shaft of the secondary lip, thereby forming a passage between the peripheral surface of the shaft, the protruding portion, and the side surface of the protruding portion. Since the seal portion is separated from the shaft, there has been proposed one in which the negative pressure is eliminated through communication between the atmosphere side and the annular space (see Patent Document 1).
Japanese Utility Model Publication No. 62-12933

しかしながら、特許文献1に開示のものにおいては、副リップに設けられる複数の突起の配置に関しては特に考慮されてなく、その結果突起が180°対向する位置に配置されている場合には前記した対向する突起によって軸が強く挟み付けられる状態となるので軸の回転時のリップに対するフリクションが大きくなるという問題があった。
本発明は、上記の点に鑑みて発明されたものであって、主リップと副リップとの間に形成される環状空間内の負圧を解消するとともに、軸に対するフリクション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。
However, in the one disclosed in Patent Document 1, no particular consideration is given to the arrangement of the plurality of protrusions provided on the sub lip, and as a result, when the protrusions are arranged at positions that oppose each other by 180 °, the above-described facing is performed. As a result, the shaft is strongly clamped by the protruding protrusions, and there is a problem that the friction against the lip during rotation of the shaft increases.
The present invention has been invented in view of the above points, and eliminates the negative pressure in the annular space formed between the main lip and the sub lip and seals to reduce the friction with respect to the shaft. The purpose is to provide a device.

本発明に係る密封装置は、前記の目的を達成するために、密封側の主リップと大気側の副リップとがゴム状弾性体で一体に成形され、軸の装着時に前記主リップと副リップとの間に形成された環状空間に生ずる負圧を解消するため前記の副リップの先端部内周面の複数箇所に突起を設けた密封装置において、前記副リップの先端部内周面の複数箇所に設けた突起の数を軸の回転方向に等間隔で奇数としたことをその特徴とするものである。   In order to achieve the above object, the sealing device according to the present invention is such that the main lip on the sealing side and the sub lip on the atmosphere side are integrally formed of a rubber-like elastic body, and the main lip and the sub lip are attached when the shaft is mounted. In order to eliminate the negative pressure generated in the annular space formed between the two, the sealing device provided with projections at a plurality of locations on the inner peripheral surface of the tip of the sub lip, at a plurality of locations on the inner peripheral surface of the tip of the sub lip This is characterized in that the number of protrusions provided is an odd number at equal intervals in the rotation direction of the shaft.

本発明に係る密封装置は、ゴム状弾性体で一体に形成された主リップと副リップとを備えた密封装置に軸が装着されたとき、前記の両リップの間に形成される環状空間内が軸の回転に伴って負圧になったときでも、副リップの先端部内周面の複数箇所に突起を設けたので、該突起が軸に接触し、軸と突起の側面との間に大気側に連通する通路となる間隙が形成され、この形成された通路により大気側と環状空間とは連通し負圧が解消される。   The sealing device according to the present invention includes an annular space formed between the two lips when a shaft is mounted on a sealing device having a main lip and a sub lip integrally formed of a rubber-like elastic body. Even when a negative pressure is generated as the shaft rotates, protrusions are provided at a plurality of locations on the inner peripheral surface of the tip of the sub lip, so that the protrusions are in contact with the shaft and the atmosphere between the shaft and the side surfaces of the protrusions A gap serving as a passage communicating with the side is formed, and the air passage and the annular space are communicated with each other by the formed passage to eliminate the negative pressure.

また、本発明にあっては、前記した副リップの先端部内周面の複数箇所に設けた突起の数を軸の回転方向に等間隔で奇数としたので、前記の副リップに設けられた突起が180°で対向することがなく、リップによって軸が強く挟み付けられる恐れがないので、軸の回転時のフリクションが低く押えられるという効果を有するものである。   Further, in the present invention, since the number of protrusions provided at a plurality of locations on the inner peripheral surface of the tip portion of the sub lip is an odd number at equal intervals in the rotation direction of the shaft, the protrusion provided on the sub lip is provided. Are not opposed to each other at 180 °, and there is no fear that the shaft is strongly pinched by the lip, so that the friction during rotation of the shaft can be kept low.

本発明の実施の形態を図に基づいて説明する。例えばオイルシールのような密封装置1は、ハウジング2と軸3との間に装着され、密封流体側Mの主リップ4と大気側Cの副リップ(ダストリップ)5がゴム状弾性体10で一体に成形されている。L型の金属製補強環6のフランジ部7の内周端部8を埋設状態として金属性補強環6の円筒部9の外周にゴム状弾性体10を焼き付け固定され、前記の主リップ4は、金属性補強環6のフランジ部7の内周端部が前記のゴム状弾性体10に埋設状態とされた基部11より密封流体側に延びる腰部12の先端部に形成され、その先端は軸3の外周面に所定の締め代を持って摺動自在に密封接触し密封流体をシールするように構成される。13は主リップ4の外周に装着される緊迫力付与のための例えばコイルスプリングである。   Embodiments of the present invention will be described with reference to the drawings. A sealing device 1 such as an oil seal is mounted between a housing 2 and a shaft 3, and a main lip 4 on the sealing fluid side M and a sub lip (dust lip) 5 on the atmosphere side C are rubber-like elastic bodies 10. It is molded integrally. A rubber-like elastic body 10 is baked and fixed on the outer periphery of the cylindrical portion 9 of the metallic reinforcing ring 6 with the inner peripheral end 8 of the flange portion 7 of the L-shaped metallic reinforcing ring 6 embedded, and the main lip 4 is The inner peripheral end portion of the flange portion 7 of the metallic reinforcing ring 6 is formed at the distal end portion of the waist portion 12 extending to the sealing fluid side from the base portion 11 embedded in the rubber-like elastic body 10, and the distal end thereof is a shaft. The outer peripheral surface of 3 has a predetermined fastening allowance so as to be slidably sealed and sealed with a sealing fluid. Reference numeral 13 denotes, for example, a coil spring that is attached to the outer periphery of the main lip 4 and applies a tension force.

前記した基部11より軸方向大気側に向けて大気側をシールする副リップ5が形成され、該副リップ5は所定の締め代をもって軸3に摺動接触して大気中の塵埃等の進入を阻止している。そして、本実施の態様においては、前記した副リップ5の先端部内周面の複数箇所には球面状の突起14,14,14が設けられ、該突起14の数は、軸の回転方向に等間隔で奇数箇所としている。本実施の態様においては、前記の突起14は120°の間隔で3箇所設けられている。   A sub lip 5 is formed to seal the atmosphere side from the base portion 11 toward the atmosphere side in the axial direction. The sub lip 5 is in sliding contact with the shaft 3 with a predetermined tightening allowance so that dust and the like enter the atmosphere. Blocking. In this embodiment, spherical projections 14, 14, 14 are provided at a plurality of locations on the inner peripheral surface of the tip of the sub lip 5, and the number of the projections 14 is equal to the rotational direction of the shaft. An odd number of intervals is used. In the present embodiment, the protrusions 14 are provided at three positions at intervals of 120 °.

前記したように、本実施の態様においては、密封流体側Mの主リップ4と大気側Cの副リップ5を有し、これらのリップ4および5の先端が所定の締め代をもって軸に接触することで密封流体側と大気側との間をシールするものであるが、前記の副リップ5の先端部内周面の複数箇所にの突起14,14,14が設けられており、軸3の回転時に主リップ4と副リップ5との間の環状空間に負圧が生じた場合には、前記の突起14,14,14が軸3に接触することで軸3と突起14の側面との間に大気側に連通する通路となる間隙15が形成され、これによって負圧が解消されるものである。   As described above, in the present embodiment, the main lip 4 on the sealed fluid side M and the sub lip 5 on the atmosphere side C are provided, and the tips of these lips 4 and 5 come into contact with the shaft with a predetermined allowance. This seals the space between the sealed fluid side and the atmosphere side. Protrusions 14, 14, 14 are provided at a plurality of locations on the inner peripheral surface of the tip portion of the sub lip 5, and the shaft 3 rotates. Sometimes, when a negative pressure is generated in the annular space between the main lip 4 and the sub lip 5, the projections 14, 14, 14 come into contact with the shaft 3, so that the shaft 3 and the side surface of the projection 14 are between A gap 15 is formed as a passage communicating with the atmosphere side, and thereby the negative pressure is eliminated.

そして、前記した副リップ5の先端部内周面の複数箇所に設けられる突起14の数を軸3の回転方向に等間隔で奇数としているので、前記の複数箇所に設けられる突起は180°で対向することがないので軸3が強く挟みつけられる状態となることがなく、軸3の回転時のフリクションが低く抑えられる。また、上記した突起14を球面状に突出する形状としたことにより、突起14が軸3に対し滑らかに接触させることができ、さらにフリクションの低減を図ることができるものである。   Since the number of projections 14 provided at a plurality of locations on the inner peripheral surface of the tip end portion of the sub lip 5 is an odd number at equal intervals in the rotation direction of the shaft 3, the projections provided at the plurality of locations are opposed at 180 °. Therefore, the shaft 3 is not strongly clamped, and the friction during rotation of the shaft 3 can be kept low. Further, by forming the above-described protrusion 14 into a spherical shape, the protrusion 14 can be brought into contact with the shaft 3 smoothly, and the friction can be reduced.

前記した突起14の数について、本実施の態様においては、軸3の回転方向に120°の等間隔で3個としたが、これに限定されるものでなく、3個以上の奇数例えば5個、7個あるいはそれ以上であっても差し支えない。   In the present embodiment, the number of the protrusions 14 described above is three at an equal interval of 120 ° in the rotation direction of the shaft 3, but is not limited to this, and an odd number of three or more, for example, five , 7 or more can be used.

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. 本発明の密封装置の副リップが通路を形成した説明図。Explanatory drawing which the sub lip of the sealing device of this invention formed the channel | path.

符号の説明Explanation of symbols

1 密封装置
4 主リップ
5 副リップ
14 突起
15 間隙(通路)
1 sealing device 4 main lip 5 sub lip 14 protrusion 15 gap (passage)

Claims (1)

密封側の主リップと大気側の副リップとがゴム状弾性体で一体に成形され、軸の装着時に前記主リップと副リップとの間に形成された環状空間に生ずる負圧を解消するため前記の副リップの先端部内周面の複数箇所に突起を設けた密封装置において、
前記副リップの先端部内周面に設けた複数箇所の突起の数を軸の回転方向に等間隔で奇数としたことを特徴とする密封装置。





















The main lip on the sealing side and the sub lip on the atmosphere side are integrally formed of a rubber-like elastic body, so that the negative pressure generated in the annular space formed between the main lip and the sub lip when the shaft is mounted is eliminated. In the sealing device provided with protrusions at a plurality of locations on the inner peripheral surface of the tip portion of the sub lip,
2. A sealing device according to claim 1, wherein the number of protrusions at a plurality of locations provided on the inner peripheral surface of the tip end portion of the sub lip is an odd number at equal intervals in the rotational direction of the shaft.





















JP2007158931A 2007-06-15 2007-06-15 Sealing device Active JP4850787B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112793203A (en) * 2020-12-23 2021-05-14 重庆春阳密封制品有限公司 One-step forming method of high-low pressure bidirectional high-strength oil seal
US11828366B2 (en) 2019-03-29 2023-11-28 Nok Corporation Sealing device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6212933B2 (en) * 1982-06-14 1987-03-23 Sumitomo Bakelite Co
JP2005291283A (en) * 2004-03-31 2005-10-20 Riken Corp Housing type pipe joint
JP2005299753A (en) * 2004-04-08 2005-10-27 Ntn Corp Sealing device for bearing for axle of rolling stock

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6212933B2 (en) * 1982-06-14 1987-03-23 Sumitomo Bakelite Co
JP2005291283A (en) * 2004-03-31 2005-10-20 Riken Corp Housing type pipe joint
JP2005299753A (en) * 2004-04-08 2005-10-27 Ntn Corp Sealing device for bearing for axle of rolling stock

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11828366B2 (en) 2019-03-29 2023-11-28 Nok Corporation Sealing device
CN112793203A (en) * 2020-12-23 2021-05-14 重庆春阳密封制品有限公司 One-step forming method of high-low pressure bidirectional high-strength oil seal

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