JP2013228076A - Sealing device - Google Patents

Sealing device Download PDF

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JP2013228076A
JP2013228076A JP2012102104A JP2012102104A JP2013228076A JP 2013228076 A JP2013228076 A JP 2013228076A JP 2012102104 A JP2012102104 A JP 2012102104A JP 2012102104 A JP2012102104 A JP 2012102104A JP 2013228076 A JP2013228076 A JP 2013228076A
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screw
sealing device
dust
boat
projection
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JP5904328B2 (en
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Shigeyuki Ono
茂之 小野
Hiroki Matsui
宏樹 松井
Tomoaki Nishimura
智昭 西村
Hideji Momotake
秀治 百武
Kokichi Hamamoto
耕吉 濱本
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Nok Corp
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Nok Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a sealing device that prevents external dust on the side of atmosphere from entering toward a lip end, and prevents leakage of a sealing fluid due to the dust, while sufficiently exhibiting pump action with screws.SOLUTION: A sealing device prevents a sealing fluid inside from leaking to the atmosphere. The sealing device includes a plurality of screws formed on a circumference and in contact with a shaft on a lip end of a seal lip and exhibiting pump action to the sealing fluid on an atmosphere-side inclined face of the seal lip. A dust preventive solid shape is arranged between the screws for preventing dust on the side of atmosphere from entering toward the lip end. The solid shape is a projection. The projection is integrally molded on a rear side surface in the shaft rotating direction of each screw, and is discontinuous to an opposite side screw, and an air flow passage is set between the projection and the opposite side screw.

Description

本発明は、シール技術に係る密封装置に関する。本発明の密封装置は例えば、自動車関連の分野で用いられ、または汎用機械の分野などで用いられる。   The present invention relates to a sealing device according to a sealing technique. The sealing device of the present invention is used, for example, in the field of automobiles or in the field of general-purpose machines.

従来から図６に示すように、シールリップ５１のポンプ量増大を目的として、シールリップ５１の大気側斜面５２に密封流体に対するポンプ作用を発揮するネジ５３を設けた密封装置が知られている。   Conventionally, as shown in FIG. 6, for the purpose of increasing the pumping amount of the seal lip 51, a sealing device is known in which a screw 53 that exerts a pumping action on a sealing fluid is provided on the atmosphere-side slope 52 of the seal lip 51.

しかしながら、このようなネジ５３付きの密封装置において、大気側Ｙの外部ダストがネジ５３間に侵入すると、侵入したダストは回転軸５５の回転に連れ回って円周方向へ移動し、移動したダストはネジ５３に接触し、接触したダストはネジ５３に沿ってリップ端５４のほうへ向けて移動する。したがってその結果として、ダストがリップ端５４および軸５５間に噛み込み、リップ端５４および軸５５間に隙間が発生し、この隙間から密封流体（オイルなど）が漏れると云う不具合が懸念される。   However, in such a sealing device with the screw 53, when the external dust on the atmosphere side Y enters between the screws 53, the intruding dust moves in the circumferential direction as the rotating shaft 55 rotates, and the moved dust Contacts the screw 53, and the contacted dust moves along the screw 53 toward the lip end 54. Therefore, as a result, there is a concern that dust may be caught between the lip end 54 and the shaft 55, and a gap is generated between the lip end 54 and the shaft 55, and a sealing fluid (oil or the like) leaks from this gap.

特許第３２７８３４９号公報Japanese Patent No. 3278349

本発明は以上の点に鑑みて、大気側の外部ダストがリップ端のほうへ侵入するのを抑制することができ、もってダストの噛み込みによる密封流体の漏れを抑制することができ、しかもネジによるポンプ作用を十分に発揮することもできる密封装置を提供することを目的とする。   In view of the above points, the present invention can suppress the entry of atmospheric external dust toward the end of the lip, thereby suppressing the leakage of the sealing fluid due to the biting of the dust, and the screw. It aims at providing the sealing device which can fully exhibit the pump action by.

上記目的を達成するため、本発明の請求項１による密封装置は、機内側の密封流体が大気側へ漏洩するのを抑制する密封装置であって、シールリップのリップ端にて軸に接触するとともに前記シールリップの大気側斜面に前記密封流体に対するポンプ作用を発揮するネジを円周上複数設けた密封装置において、大気側の外部ダストが前記リップ端のほうへ侵入するのを抑制すべく前記ネジ間にダスト侵入防止用の立体形状を設け、前記立体形状は突起よりなり、前記突起は各ネジの軸回転方向後方側の面に一体成形されるとともに反対側のネジに対し不連続であって、前記突起および反対側のネジ間に空気流路が設定されていることを特徴とする。   In order to achieve the above object, a sealing device according to claim 1 of the present invention is a sealing device that suppresses leakage of a sealing fluid inside the machine to the atmosphere side, and contacts the shaft at the lip end of the sealing lip. In addition, in the sealing device in which a plurality of screws on the circumference are provided on the atmosphere-side slope of the seal lip so as to exert a pumping action on the sealing fluid, the atmosphere-side external dust is prevented from entering the lip end. A three-dimensional shape for preventing dust intrusion is provided between the screws, and the three-dimensional shape is formed of a protrusion, and the protrusion is integrally formed on the surface on the rear side in the axial rotation direction of each screw and is discontinuous with the screw on the opposite side. An air flow path is set between the protrusion and the screw on the opposite side.

また、本発明の請求項２による密封装置は、上記した請求項１記載の密封装置において、前記ネジはそれぞれ、前記リップ端近傍に設けられた断面均一の平行ネジと、前記平行ネジから連続して設けられた舟底形ネジとよりなり、前記立体形状の突起は、前記舟底形ネジにおける長手方向中央部の軸回転方向後方側に高さ略同等の突起として一体成形されるとともに、軸回転方向に対し垂直な向きのダスト堰き止め面を有することを特徴とする。   The sealing device according to a second aspect of the present invention is the sealing device according to the first aspect, wherein the screws are continuous from the parallel screws having a uniform cross section provided in the vicinity of the lip end and the parallel screws. The three-dimensional projection is integrally formed as a projection having substantially the same height on the rear side in the axial rotation direction of the center portion in the longitudinal direction of the boat bottom screw. It has a dust damming surface in a direction perpendicular to the rotation direction.

また、本発明の請求項３による密封装置は、上記した請求項１記載の密封装置において、前記ネジはそれぞれ、前記リップ端近傍に設けられた断面均一の平行ネジと、前記平行ネジから連続して設けられた舟底形ネジとよりなり、前記立体形状の突起は、前記平行ネジおよび舟底形ネジの接続部から分岐するように設けられた舟底形の突起よりなることを特徴とする。   The sealing device according to a third aspect of the present invention is the sealing device according to the first aspect, wherein the screws are continuous from the parallel screw having a uniform cross section provided near the lip end and the parallel screw. The three-dimensional projection is a boat-bottom projection provided to be branched from the connecting portion of the parallel screw and the boat-bottom screw. .

また、本発明の請求項４による密封装置は、上記した請求項１記載の密封装置において、前記ネジはそれぞれ、前記リップ端近傍に設けられた断面均一の平行ネジと、前記平行ネジから連続して設けられた舟底形ネジとよりなり、前記立体形状の突起は、前記平行ネジおよび舟底形ネジの接続部から分岐するように設けられた断面均一の突起よりなることを特徴とする。   The sealing device according to claim 4 of the present invention is the sealing device according to claim 1, wherein the screws are continuous from the parallel screws having a uniform cross section provided in the vicinity of the lip end and the parallel screws. The three-dimensional projection is a projection having a uniform cross section provided to branch from the connecting portion of the parallel screw and the boat bottom screw.

更にまた、本発明の請求項５による密封装置は、上記した請求項１、２、３または４記載の密封装置において、前記ネジはそれぞれ、前記リップ端近傍に設けられた断面均一の平行ネジと、前記平行ネジから連続して設けられた舟底形ネジとよりなり、前記立体形状の突起は、前記平行ネジおよび舟底形ネジの接続部から分岐するように設けられた突起よりなり、更に、前記舟底形ネジの大気側端部に、前記舟底形ネジと反対の向きに傾斜した反対向きネジが設けられていることを特徴とする。   Furthermore, the sealing device according to claim 5 of the present invention is the sealing device according to claim 1, 2, 3 or 4, wherein each of the screws is a parallel screw having a uniform cross section provided in the vicinity of the lip end. The three-dimensional projection is formed by a projection provided to branch from the connection portion of the parallel screw and the boat bottom screw, and An opposite-direction screw inclined in an opposite direction to the boat-bottom screw is provided at the atmosphere side end of the boat-bottom screw.

上記構成を備える本発明の密封装置においては、大気側の外部ダストがリップ端のほうへ侵入するのを抑制すべく複数のネジ間にダスト侵入防止用の立体形状が設けられているために、この立体形状が、大気側のダストがリップ端のほうへ侵入するのを抑制する機能を発揮する。立体形状は突起よりなり、突起がダストを堰き止めるため、ダストがリップ端のほうへ侵入するのを抑制することが可能とされる。またその一方で、突起は各ネジの軸回転方向後方側の面に一体成形されるとともに反対側のネジに対し不連続であって突起および反対側のネジ間に空気流路が設定されているため、ネジ間に突起が設けられても、この空気流路を流れる空気によってネジによるポンプ作用を十分に発揮させることが可能とされる。   In the sealing device of the present invention having the above-described configuration, since a three-dimensional shape for preventing dust intrusion is provided between the plurality of screws to suppress external dust on the air side from entering the lip end, This three-dimensional shape exhibits a function of suppressing the dust on the atmosphere side from entering the lip end. The three-dimensional shape is composed of protrusions, and the protrusions dam up the dust, so that the dust can be prevented from entering the lip end. On the other hand, the protrusions are integrally formed on the rear surface of each screw in the axial rotation direction, are discontinuous with respect to the opposite screw, and an air flow path is set between the protrusion and the opposite screw. Therefore, even if the protrusion is provided between the screws, the pumping action by the screw can be sufficiently exhibited by the air flowing through the air flow path.

突起は例えば、舟底形ネジにおける長手方向中央部の軸回転方向後方側に高さ略同等の突起として一体成形されるとともに、軸回転方向に対し垂直な向きのダスト堰き止め面を有するものとする。この突起によれば、軸の回転に連れ回ったダストをダスト堰き止め面で堰き止めるため、ダストがネジに沿ってリップ端のほうへ向けて移動するのが抑制される。舟底形ネジは、その高さおよび幅が長手方向の中央部で最も大きく、両端へ向けて徐々に縮小される形状である。
For example, the protrusion is integrally formed as a protrusion having substantially the same height on the rear side in the axial direction of the center portion in the longitudinal direction of the boat bottom screw, and has a dust damming surface oriented perpendicular to the axial direction. To do. According to this protrusion, since the dust that has been rotated with the rotation of the shaft is blocked by the dust blocking surface, it is possible to suppress the movement of the dust along the screw toward the lip end. The boat-bottomed screw has a shape such that its height and width are the largest in the central portion in the longitudinal direction and are gradually reduced toward both ends.

また、突起は例えば、平行ネジおよび舟底形ネジの接続部から分岐するように設けられた舟底形の突起よりなるものとする。この突起によれば、ネジに沿ってリップ端のほうへ向けて移動しようとするダストをこの突起で堰き止めるため、ダストが同方向へ向けて移動するのが抑制される。平行ネジは、その断面形状が全長に亙って均一な形状である。   In addition, the protrusion is made of, for example, a boat bottom-shaped protrusion provided so as to branch from a connection portion between the parallel screw and the boat bottom-shaped screw. According to this projection, dust that moves toward the lip end along the screw is dammed up by this projection, so that the dust is restrained from moving in the same direction. The parallel screw has a uniform cross-sectional shape over its entire length.

また、突起は例えば、平行ネジおよび舟底形ネジの接続部から分岐するように設けられた断面均一の突起よりなるものとする。この突起によればやはり、ネジに沿ってリップ端のほうへ向けて移動しようとするダストをこの突起で堰き止めるため、ダストが同方向へ向けて移動するのが抑制される。   In addition, the protrusion is made of, for example, a protrusion having a uniform cross section provided so as to branch from a connection portion of the parallel screw and the boat bottom shape screw. Again, according to this projection, dust that moves toward the lip end along the screw is dammed up by this projection, so that the dust is prevented from moving in the same direction.

また、突起の形状如何を問わず、舟底形ネジの大気側端部に、舟底形ネジと反対の向きに傾斜した反対向きネジを設けることが考えられ、この場合には、以下の作用効果が発揮される。   Regardless of the shape of the projection, it is conceivable to provide an opposite-direction screw inclined in the opposite direction to the boat-bottom screw at the atmospheric end of the boat-bottom screw. The effect is demonstrated.

すなわち、反対向きネジはその傾斜の向きが舟底形ネジと反対であるので、軸回転時、リップ端側から大気側へ向けて空気の流れが発生する。したがって大気側からネジ間に侵入してきたダストをこの空気の流れに乗せて積極的に大気側へ押し戻すことが可能とされる。   That is, since the direction of the inclination of the opposite direction screw is opposite to that of the boat bottom type screw, an air flow is generated from the lip end side toward the atmosphere side when the shaft rotates. Accordingly, dust that has entered between the screws from the atmosphere side can be positively pushed back to the atmosphere side by being put on this air flow.

本発明は、以下の効果を奏する。   The present invention has the following effects.

すなわち、本発明においては上記したように、大気側のダストがリップ端のほうへ侵入するのを抑制すべく複数のネジ間にダスト侵入防止用の立体形状が設けられているため、この立体形状が、大気側のダストがリップ端のほうへ侵入するのを抑制する機能を発揮する。立体形状は突起であり、突起はダストを堰き止めるため、ダストがリップ端のほうへ侵入するのを抑制する。またその一方で、突起は各ネジの軸回転方向後方側の面に一体成形されるとともに反対側のネジに対し不連続であって突起および反対側のネジ間に空気流路が設定されているため、ネジ間に突起が設けられても、空気流路を流れる空気によってネジによるポンプ作用を十分に発揮する。したがって以上のことから本発明所期の目的どおり、大気側の外部ダストがリップ端のほうへ侵入するのを抑制し、もってダストの噛み込みによる密封流体の漏れを抑制し、しかもネジによるポンプ作用を十分に発揮する密封装置を提供することができる。   That is, in the present invention, as described above, a three-dimensional shape for preventing dust intrusion is provided between a plurality of screws so as to prevent the dust on the air side from entering the lip end. However, it exerts a function of suppressing the dust on the atmosphere side from entering the lip end. The three-dimensional shape is a protrusion, and the protrusion dams up the dust, so that the dust is prevented from entering the lip end. On the other hand, the protrusions are integrally formed on the rear surface of each screw in the axial rotation direction, are discontinuous with respect to the opposite screw, and an air flow path is set between the protrusion and the opposite screw. Therefore, even if the protrusions are provided between the screws, the pumping action by the screws is sufficiently exhibited by the air flowing through the air flow path. Therefore, according to the intended purpose of the present invention, the external dust on the atmosphere side is prevented from entering the lip end, so that the leakage of the sealing fluid due to the biting of the dust is suppressed, and the pump action by the screw It is possible to provide a sealing device that sufficiently exhibits the above.

また、突起が、舟底形ネジにおける長手方向中央部の軸回転方向後方側に高さ略同等の突起として一体成形されるとともに軸回転方向に対し垂直な向きのダスト堰き止め面を有する場合には、軸の回転に連れ回ったダストをダスト堰き止め面で堰き止めるため、ダストがネジに沿ってリップ端のほうへ向けて移動するのが抑制される。   Further, when the protrusion is integrally formed as a protrusion having substantially the same height on the rear side in the axial rotation direction of the center part in the longitudinal direction of the boat bottom screw and has a dust damming surface oriented perpendicular to the axial rotation direction Since the dust that is rotated with the rotation of the shaft is blocked by the dust blocking surface, the dust is restrained from moving along the screw toward the lip end.

また、突起が、平行ネジおよび舟底形ネジの接続部から分岐するように設けられた舟底形の突起よりなる場合には、ネジに沿ってリップ端のほうへ向けて移動しようとするダストをこの突起で堰き止めるため、ダストが同方向へ向けて移動するのが抑制される。   In addition, when the projection is a boat-bottom projection provided so as to branch off from the connection portion of the parallel screw and the boat-bottom screw, dust that tends to move toward the lip end along the screw. Is prevented by the projections, so that dust is prevented from moving in the same direction.

また、突起が、平行ネジおよび舟底形ネジの接続部から分岐するように設けられた断面均一の突起よりなる場合にはやはり、ネジに沿ってリップ端のほうへ向けて移動しようとするダストをこの突起で堰き止めるため、ダストが同方向へ向けて移動するのが抑制される。   In addition, when the projection is a projection having a uniform cross section provided so as to branch off from the connection portion of the parallel screw and the boat bottom-shaped screw, the dust that is going to move toward the lip end along the screw is again. Is prevented by the projections, so that dust is prevented from moving in the same direction.

また、突起の形状如何を問わず、舟底形ネジの大気側端部に、舟底形ネジと反対の向きに傾斜した反対向きネジを設けた場合には、反対向きネジのポンプ作用によってダストを積極的に大気側へ押し戻す。   Regardless of the shape of the projection, if an opposite-direction screw inclined in the direction opposite to the boat-bottom screw is provided at the atmosphere side end of the boat-bottom screw, dust is generated by the pump action of the opposite screw. Is actively pushed back to the atmosphere.

したがって、これらの突起または反対向きネジによれば、ダストがリップ端のほうへ侵入するのを有効に抑制することができる。   Therefore, according to these protrusions or oppositely directed screws, it is possible to effectively suppress dust from entering the lip end.

本発明の第１実施例に係る密封装置の要部断面図Sectional drawing of the principal part of the sealing device which concerns on 1st Example of this invention. 同密封装置におけるネジおよび立体形状の説明図であって、（Ａ）はネジおよび立体形状の平面図、（Ｂ）は（Ａ）におけるＢ−Ｂ線断面図、（Ｃ）は（Ａ）におけるＣ−Ｃ線断面図、（Ｄ）は（Ａ）におけるＤ−Ｄ線断面図It is explanatory drawing of the screw and solid shape in the sealing device, (A) is a top view of a screw and solid shape, (B) is a BB line sectional view in (A), (C) is in (A). CC sectional view, (D) is the DD sectional view in (A). 本発明の第２実施例に係る密封装置の要部断面図Sectional drawing of the principal part of the sealing device which concerns on 2nd Example of this invention. 本発明の第３実施例に係る密封装置の要部断面図Sectional drawing of the principal part of the sealing device which concerns on 3rd Example of this invention. 本発明の第４実施例に係る密封装置を示す図で、（Ａ）は同密封装置の要部断面図、（Ｂ）はネジおよび立体形状の説明図It is a figure which shows the sealing device which concerns on 4th Example of this invention, (A) is principal part sectional drawing of the sealing device, (B) is explanatory drawing of a screw and a solid shape 従来例に係る密封装置の要部断面図Sectional drawing of the principal part of the sealing device which concerns on a prior art example

本発明には、以下の実施形態が含まれる。
（１−１）構成
（１−１−１）回転軸の回転方向側のＮＦネジ部に回転方向に垂直面を持つ突起を形成する。
（１−１−２）垂直面突起の高さは垂直面以外のＮＦネジ部と同等以下とする。
（１−２）効果
（１−２−１）回転軸の回転に連れ回ったダスト等をネジ部垂直面で堰き止めることにより、ダストの垂直面以外のネジへの接触を少なくする。
（１−２−２）ネジ部垂直面と隣接ネジが接触していないため、空気の流路が確保され、ポンプ量は維持される。 The present invention includes the following embodiments.
(1-1) Configuration (1-1-1) A protrusion having a surface perpendicular to the rotation direction is formed on the NF screw portion on the rotation direction side of the rotation shaft.
(1-1-2) The height of the vertical surface protrusion is equal to or less than that of the NF screw portion other than the vertical surface.
(1-2) Effect (1-2-1) Dust or the like that has been rotated along with the rotation of the rotating shaft is dammed up by the vertical surface of the screw part, thereby reducing the contact of the dust with the screw other than the vertical surface.
(1-2-2) Since the screw portion vertical surface and the adjacent screw are not in contact with each other, an air flow path is secured and the pump amount is maintained.

（２−１）構成
（２−１−１）舟底ネジに、ダストをトラップするネジ（突起）を設定する。このネジ（突起）によって、舟底ネジに沿ってリップ先端部へ移動していたダストをトラップし、主リップ先端へのダスト移動を抑制する。
（２−１−２）舟底状の突起は、舟底ネジと同等の高さ設定である。但し、舟底ネジのネジ山高さより低くても可。また、リップ先端側の平行ネジより高い設定である。
（２−１−３）平行状の突起は、リップ先端側の平行ネジ山高さ以上、舟底ネジ山高さ以下とする。
（２−２）効果
（２−２−１）本発明により、主リップ先端側へ移動する外部ダストをトラップし、リップ先端へ移動するダストを少なくする。
（２−２−２）これにより、主リップ先端でダストを噛み込みにくくなり、油漏れの改善および車両寿命の向上が図れる。 (2-1) Configuration (2-1-1) A screw (projection) for trapping dust is set on the boat bottom screw. This screw (projection) traps the dust that has moved to the lip tip along the boat bottom screw and suppresses the dust movement to the tip of the main lip.
(2-1-2) The bottom of the boat has a height setting equivalent to that of the boat bottom screw. However, it can be lower than the screw height of the boat bottom screw. The setting is higher than the parallel screw on the lip tip side.
(2-1-3) The parallel protrusions have a height equal to or greater than the parallel thread height on the lip tip side and equal to or less than the boat bottom thread height.
(2-2) Effects (2-2-1) According to the present invention, external dust moving to the main lip tip side is trapped, and dust moving to the lip tip is reduced.
(2-2-2) Thereby, it becomes difficult to bite dust at the front end of the main lip, and oil leakage can be improved and vehicle life can be improved.

（３−１）構成
（３−１−１）舟底ネジのダスト側に、ネジと逆方向の突起を設定する。またネジと逆方向の突起は、オイル側からダスト側に向かうにしたがい突起高さを高く設定する。この逆方向の突起によって、軸回転時にオイル側からダスト側へのエアの流れを形成する。
（３−１−２）また、ネジにも別途、突起を設定し、ダストがネジに沿って主リップ先端方向に向かって移動した場合においても、突起によってダストをトラップし、主リップ先端への移動を抑制する。突起の高さは、リップ先端側の平行ネジ山高さ以上、舟底ネジ山高さ以下とする。
（３−２）効果
（３−２−１）本発明により、逆方向の突起によって形成されたエアの流れにより、オイル側（主リップ先端側）へ移動するダスト量を抑制できる。また外部ダストがネジに沿って主リップ先端側へ移動する場合においても、突起によってトラップされる。
（３−２−２）これにより、主リップ先端がダストを噛み込みにくくなり、油漏れの改善および車両寿命の向上が図れる。 (3-1) Configuration (3-1-1) On the dust side of the boat bottom screw, a protrusion opposite to the screw is set. Further, the height of the protrusion in the direction opposite to the screw is set higher as it goes from the oil side to the dust side. The protrusion in the opposite direction forms an air flow from the oil side to the dust side when the shaft rotates.
(3-1-2) In addition, when a protrusion is separately set on the screw and dust moves toward the main lip tip along the screw, the dust is trapped by the protrusion, Suppress movement. The height of the protrusion is not less than the parallel thread height on the lip tip side and not more than the boat bottom thread height.
(3-2) Effect (3-2-1) According to the present invention, the amount of dust moving to the oil side (main lip tip side) can be suppressed by the air flow formed by the protrusions in the reverse direction. Even when external dust moves along the screw toward the tip of the main lip, it is trapped by the protrusion.
(3-2-2) This makes it difficult for the tip of the main lip to bite dust, improving oil leakage and improving the vehicle life.

つぎに本発明の実施例を図面にしたがって説明する。   Next, embodiments of the present invention will be described with reference to the drawings.

図１および図２は、本発明の第１実施例に係る密封装置を示している。当該実施例に係る密封装置は、機器（図示せず）の軸孔内周面に装着されるとともにシールリップ１１を軸（図示せず）の周面に摺動可能に密接させることにより機内側Ｘの密封流体（図示せず）が大気側Ｙへ漏洩するのを抑制する。軸は矢印Ｚ方向に回転する。当該密封装置はその機能または用途からして回転用オイルシールと称されることもある。   1 and 2 show a sealing device according to a first embodiment of the present invention. The sealing device according to this embodiment is mounted on the inner peripheral surface of a shaft hole of a device (not shown) and slidably comes into close contact with the peripheral surface of the shaft (not shown). X leakage fluid (not shown) is prevented from leaking to the atmosphere side Y. The shaft rotates in the direction of arrow Z. The sealing device is sometimes called a rotating oil seal because of its function or use.

シールリップ１１は、そのリップ端１２にて軸の周面に摺動可能に密接するものであって、リップ端１２の機内側Ｘに機内側斜面１３が設けられるとともにリップ端１２の大気側Ｙに大気側斜面１４が設けられている。また後者の大気側斜面１４に、軸の回転時に密封流体に対するポンプ作用を発揮して密封流体を機内側Ｘへ押し戻すためのネジ１５が円周上複数設けられている。   The seal lip 11 is slidably in close contact with the peripheral surface of the shaft at the lip end 12, and an inboard side slope 13 is provided on the inboard side X of the lip end 12 and the atmosphere side Y of the lip end 12. Atmosphere side slope 14 is provided. A plurality of screws 15 on the circumference are provided on the latter air-side slope 14 for exerting a pumping action on the sealing fluid when the shaft rotates to push the sealing fluid back to the machine interior X.

ネジ１５は、スパイラル状に設けられた突起であって、リップ端１２に達するように設けられた断面均一の平行ネジ１６と、平行ネジ１６から連続して設けられた舟底形ネジ１７との組み合わせにより形成されている。ネジ１５はそのリップ端側の基端部から大気側Ｙの先端部へかけて軸回転方向Ｚの後方へ向けて傾斜するように形成されている。平行ネジ１６は例えば略三角断面形状の突起であって、その断面形状が全長に亙って均一な形状に形成されている。舟底形ネジ１７は例えば略三角断面形状の突起であって、その高さおよび幅が長手方向の中央部で最も大きく、両端部へ向けて徐々に縮小される形状に形成されている。図１では作図の都合上、ネジ１５が３つのみ描かれているが、ネジ１５は全周に亙って多数が設けられている。   The screw 15 is a projection provided in a spiral shape, and includes a parallel screw 16 having a uniform cross-section provided so as to reach the lip end 12 and a boat bottom-shaped screw 17 provided continuously from the parallel screw 16. It is formed by a combination. The screw 15 is formed so as to incline backward in the axial rotation direction Z from the base end portion on the lip end side to the tip end portion on the atmosphere side Y. The parallel screw 16 is, for example, a protrusion having a substantially triangular cross section, and the cross section is formed in a uniform shape over the entire length. The boat bottom-shaped screw 17 is, for example, a protrusion having a substantially triangular cross-sectional shape, and has a height and width that are the largest at the center in the longitudinal direction and gradually reduced toward both ends. In FIG. 1, for convenience of drawing, only three screws 15 are depicted, but many screws 15 are provided over the entire circumference.

また、当該実施例に係る密封装置では、大気側Ｙの外部ダスト（図示せず）がリップ端１２のほうへ侵入しないよう以下の構成が設けられている。ダストは例えば、泥水に含まれる砂粒などである。   Further, in the sealing device according to the embodiment, the following configuration is provided so that external dust (not shown) on the atmosphere side Y does not enter the lip end 12. The dust is, for example, sand particles contained in muddy water.

すなわち、上記シールリップ１１の大気側斜面１４上において、大気側Ｙの外部ダストが互いに隣り合うネジ１５間の間隙部を介してリップ端１２のほうへ侵入しないよう、互いに隣り合うネジ１５間にダスト侵入防止用の立体形状２１が設けられている。   That is, on the atmosphere-side inclined surface 14 of the seal lip 11, the external dust on the atmosphere-side Y does not enter the lip end 12 through the gap between the adjacent screws 15. A three-dimensional shape 21 for preventing dust intrusion is provided.

立体形状２１は、突起２２よりなり、この突起２２は各ネジ１５の軸回転方向Ｚの後方側の面（図１では突起２２の左側の面）に一体成形されるとともに、反対側のネジ（突起２２に対しその軸回転方向Ｚの後方側１５に配置されたネジ、図１では突起２２に対しその左側に配置されたネジ）１５に対し不連続とされ、突起２２および反対側のネジ１５間に空気流路２４が設けられている。空気流路２３は大気側Ｙからリップ端側へ向けて空気を流し、ネジ１５によるポンプ作用を助長する。   The three-dimensional shape 21 is composed of a protrusion 22, and this protrusion 22 is integrally formed on the rear surface of each screw 15 in the axial rotation direction Z (the surface on the left side of the protrusion 22 in FIG. 1). A screw disposed on the rear side 15 in the axial rotation direction Z with respect to the projection 22 (a screw disposed on the left side of the projection 22 in FIG. 1) 15 is discontinuous, and the projection 22 and the screw 15 on the opposite side An air flow path 24 is provided therebetween. The air flow path 23 flows air from the atmosphere side Y toward the lip end side, and promotes the pumping action by the screw 15.

また、突起２２は、舟底形ネジ１７における長手方向中央部の軸回転方向Ｚの後方側に高さ略同等の突起として一体成形され、その平面形状は舟底形ネジ１７を底辺とする略三角形状とされ、その立ち上がり面の一部（三角の一方の斜辺の位置）に、軸回転方向Ｚに対し垂直な向きのダスト堰き止め面２３が設けられている。   Further, the protrusion 22 is integrally formed as a protrusion having substantially the same height on the rear side in the axial rotation direction Z of the center portion in the longitudinal direction of the boat bottom-shaped screw 17, and the planar shape thereof is substantially the bottom of the boat-bottom screw 17. A dust damming surface 23 oriented in a direction perpendicular to the axial rotation direction Z is provided on a part of the rising surface (position of one oblique side of the triangle).

上記構成の密封装置においては、大気側Ｙの外部ダストがリップ端１２のほうへ侵入するのを抑制すべく互いに隣り合うネジ１５間にダスト侵入防止用の立体形状２１が設けられているため、この立体形状２１が、大気側Ｙのダストがリップ端１２のほうへ侵入するのを抑制する機能を発揮する。立体形状２１は突起２２よりなり、この突起２２が軸の回転に連れ回ったダストをダスト堰き止め面２３で堰き止めるため、ダストがネジ１５に沿ってリップ端１２のほうへ向けて移動するのが抑制される。したがって以上のことから大気側Ｙのダストがリップ端１２のほうへ侵入するのを抑制することができ、もってダストの噛み込みによる密封流体の漏れを抑制することができる。   In the sealing device configured as described above, the three-dimensional shape 21 for preventing dust intrusion is provided between the screws 15 adjacent to each other in order to prevent the external dust on the atmosphere side Y from entering the lip end 12. This three-dimensional shape 21 exhibits a function of suppressing the dust on the atmosphere side Y from entering the lip end 12. The three-dimensional shape 21 is formed of a protrusion 22, and the dust moves along the screw 15 toward the lip end 12 because the protrusion 22 dams up dust with the rotation of the shaft by the dust damming surface 23. Is suppressed. Therefore, from the above, it is possible to suppress the dust on the atmosphere side Y from entering the lip end 12, and thus it is possible to suppress the leakage of the sealing fluid due to the biting of the dust.

またその一方で、突起２２は反対側のネジ１５に対し不連続とされ突起２２および反対側のネジ１５間に空気流路２４が設定されているため、ネジ間１５に突起２２が設けられても、空気流路２４を流れる空気によってネジ１５によるポンプ作用が十分に発揮される。したがってダスト侵入防止用の突起２２が設けられてもネジ１５によるポンプ作用が十分に発揮される。   On the other hand, since the protrusion 22 is discontinuous with respect to the screw 15 on the opposite side and the air flow path 24 is set between the protrusion 22 and the screw 15 on the opposite side, the protrusion 22 is provided between the screws 15. However, the pumping action by the screw 15 is sufficiently exhibited by the air flowing through the air flow path 24. Therefore, even if the protrusion 22 for preventing dust intrusion is provided, the pump action by the screw 15 is sufficiently exhibited.

上記第１実施例に係る密封装置は、その構成が以下のようなものであっても良い。   The sealing device according to the first embodiment may have the following configuration.

（イ）
上記第１実施例では、突起２２を平面略三角形状の突起としたが、これに代えて突起を舟底形の突起とする。 (I)
In the first embodiment, the projection 22 is a substantially triangular projection, but instead, the projection is a boat bottom projection.

第２実施例として示す図３において、立体形状２１の突起２５は、平行ネジ１６および舟底形ネジ１７の接続部から分岐するように設けられた舟底形突起とされている。舟底形突起２５は、舟底形ネジ１７と同様、略三角断面形状の突起であって、その高さおよび幅が長手方向の中央部で最も大きく、両端部へ向けて徐々に縮小される形状に形成されている。舟底形突起２５は、舟底形ネジ１７と同様、そのリップ端側の基端部から大気側Ｙの先端部へかけて軸回転方向Ｚの後方へ向けて傾斜するようスパイラル状に形成されているが、そのリップ端１２に対する傾斜角度は、舟底形ネジ１７のリップ端１２に対する傾斜角度より小さく設定されている。舟底形突起２５はリップ端１２と平行であっても良い。舟底形突起２５の高さは舟底形ネジ１７の高さと同等に設定されているが、舟底形ネジ１７の高さより低くても良い。また舟底形突起２５の高さは平行ネジ１６の高さより高く設定されている。この舟底形突起２５によれば、ネジ１５に沿ってリップ端１２のほうへ向けて移動しようとするダストをこの突起２５で堰き止めるため、ダストが同方向へ向けて移動するのを抑制することができる。   In FIG. 3 shown as the second embodiment, the projection 25 of the three-dimensional shape 21 is a boat bottom-shaped projection provided so as to branch from the connecting portion of the parallel screw 16 and the boat bottom-shaped screw 17. The boat bottom-shaped protrusion 25 is a protrusion having a substantially triangular cross-sectional shape, similar to the boat bottom-shaped screw 17, and its height and width are the largest in the central portion in the longitudinal direction and are gradually reduced toward both ends. It is formed into a shape. As with the boat bottom screw 17, the boat bottom protrusion 25 is formed in a spiral shape so as to incline toward the rear in the axial rotation direction Z from the base end on the lip end side to the tip end on the atmosphere side Y. However, the inclination angle with respect to the lip end 12 is set smaller than the inclination angle with respect to the lip end 12 of the boat bottom-shaped screw 17. The boat bottom projection 25 may be parallel to the lip end 12. The height of the boat bottom projection 25 is set equal to the height of the boat bottom screw 17, but may be lower than the height of the boat bottom screw 17. Further, the height of the boat bottom projection 25 is set higher than the height of the parallel screw 16. According to the boat-bottom projection 25, dust that moves toward the lip end 12 along the screw 15 is blocked by the projection 25, so that the dust is prevented from moving in the same direction. be able to.

（ロ）
上記第１実施例では、突起２２を平面略三角形状の突起としたが、これに代えて突起を断面均一の平行状の突起とする。 (B)
In the first embodiment, the protrusion 22 is a substantially triangular protrusion, but instead, the protrusion is a parallel protrusion having a uniform cross section.

第３実施例として示す図４において、立体形状２１の突起２６は、平行ネジ１６および舟底形ネジ１７の接続部から分岐するように設けられた断面均一の平行状突起とされている。平行状突起２６は、平行ネジ１６と同様、略三角断面形状の突起であって、その断面形状が全長に亙って均一な形状に形成されている。平行状突起２６は、平行ネジ１６と同様、そのリップ端側の基端部から大気側Ｙの先端部へかけて軸回転方向Ｚの後方へ向けて傾斜するようスパイラル状に形成されているが、そのリップ端１２に対する傾斜角度は、平行ネジ１６のリップ端１２に対する傾斜角度より小さく設定されている。平行状突起２６はリップ端１２と平行であっても良い。舟底形突起２５の高さは平行ネジ１６の高さ以上であって舟底形ネジ１７の最大高さ以下に設定されている。この平行状突起２６によれば、ネジ１５に沿ってリップ端１２のほうへ向けて移動しようとするダストをこの突起２６で堰き止めるため、ダストが同方向へ向けて移動するのを抑制することができる。   In FIG. 4 shown as the third embodiment, the projection 26 of the three-dimensional shape 21 is a parallel projection having a uniform cross section provided so as to branch from the connecting portion of the parallel screw 16 and the boat bottom screw 17. Similar to the parallel screw 16, the parallel protrusion 26 is a protrusion having a substantially triangular cross-sectional shape, and the cross-sectional shape is formed in a uniform shape over the entire length. Similar to the parallel screw 16, the parallel protrusion 26 is formed in a spiral shape so as to incline backward in the axial rotation direction Z from the base end portion on the lip end side to the tip end portion on the atmosphere side Y. The inclination angle with respect to the lip end 12 is set smaller than the inclination angle with respect to the lip end 12 of the parallel screw 16. The parallel protrusions 26 may be parallel to the lip end 12. The height of the boat bottom projection 25 is set to be equal to or higher than the height of the parallel screw 16 and lower than the maximum height of the boat bottom screw 17. According to the parallel protrusions 26, the dust that moves toward the lip end 12 along the screw 15 is blocked by the protrusions 26, so that the dust is prevented from moving in the same direction. Can do.

（ハ）
上記各実施例では、突起を平面略三角形状の突起、舟底形の突起または断面均一の平行状の突起としたが、これら突起の形状如何を問わず、舟底形ネジの大気側端部に、舟底形ネジと反対の向きに傾斜した反対向きネジを設ける。 (C)
In each of the above-described embodiments, the projection is a substantially triangular projection, a boat-bottom projection, or a parallel projection having a uniform cross section. However, regardless of the shape of these projections, the atmospheric side end of the boat-bottom screw Are provided with an opposite-direction screw inclined in the opposite direction to the boat bottom-type screw.

第４実施例として示す図５において、舟底形ネジ１７の大気側端部には、舟底形ネジと反対の向きに傾斜した反対向きネジ１８が連続して設けられており、舟底形ネジ１７はそのリップ端側の基端部から大気側Ｙの先端部へかけて軸回転方向Ｚの後方へ向けて傾斜するように形成されているので、反対向きネジ１８はそのリップ端側の基端部から大気側Ｙの先端部へかけて軸回転方向Ｚの前方へ向けて傾斜するように形成されている。また反対向きネジ１８の高さは、そのリップ端側の基端部にて舟底形ネジ１７と同等とされ、リップ端側の基端部から大気側Ｙの先端部へかけて徐々に高くなるように設定されている。この反対向きネジ１８によれば、その傾斜の向きが舟底形ネジ１７と反対であるので、軸回転時にリップ端側から大気側Ｙへ向けて空気の流れが発生する。したがって大気側Ｙからネジ１５間に侵入してきたダストをこの空気の流れに乗せて積極的に大気側Ｙへ押し戻すことができる。   In FIG. 5 shown as the fourth embodiment, an opposite-side screw 18 inclined in the direction opposite to the boat bottom screw is continuously provided at the atmosphere side end of the boat bottom screw 17. Since the screw 17 is formed so as to incline toward the rear in the axial rotation direction Z from the base end portion on the lip end side to the tip end portion on the atmosphere side Y, the opposite screw 18 is on the lip end side. It is formed so as to incline toward the front in the axial rotation direction Z from the proximal end portion to the distal end portion on the atmosphere side Y. The height of the opposite direction screw 18 is equal to the boat bottom screw 17 at the base end portion on the lip end side, and gradually increases from the base end portion on the lip end side to the tip end portion on the atmosphere side Y. It is set to be. According to the opposite direction screw 18, since the direction of the inclination is opposite to the boat bottom shape screw 17, an air flow is generated from the lip end side to the atmosphere side Y when the shaft rotates. Accordingly, dust that has entered between the screws 15 from the atmosphere side Y can be positively pushed back to the atmosphere side Y by being put on this air flow.

１１ シールリップ
１２ リップ端
１３ 機内側斜面
１４ 大気側斜面
１５ ネジ
１６ 平行ネジ
１７ 舟底形ネジ
１８ 反対向きネジ
２１ 立体形状
２２，２５，２６ 突起
２３ ダスト堰き止め面
２４ 空気流路
Ｘ 機内側
Ｙ 大気側 DESCRIPTION OF SYMBOLS 11 Seal lip 12 Lip end 13 Aircraft inside slope 14 Atmosphere side slope 15 Screw 16 Parallel screw 17 Ship bottom type screw 18 Opposite direction screw 21 Three-dimensional shape 22,25,26 Protrusion 23 Dust damming surface 24 Air flow path X Aircraft inside Y Atmosphere side

Claims (5)

機内側の密封流体が大気側へ漏洩するのを抑制する密封装置であって、
シールリップのリップ端にて軸に接触するとともに前記シールリップの大気側斜面に前記密封流体に対するポンプ作用を発揮するネジを円周上複数設けた密封装置において、
大気側の外部ダストが前記リップ端のほうへ侵入するのを抑制すべく前記ネジ間にダスト侵入防止用の立体形状を設け、
前記立体形状は突起よりなり、前記突起は各ネジの軸回転方向後方側の面に一体成形されるとともに反対側のネジに対し不連続であって、前記突起および反対側のネジ間に空気流路が設定されていることを特徴とする密封装置。 A sealing device that suppresses leakage of the sealing fluid inside the machine to the atmosphere side,
In the sealing device provided with a plurality of screws on the circumference that contact the shaft at the lip end of the seal lip and that exert a pumping action on the sealing fluid on the atmosphere-side slope of the seal lip,
In order to suppress external dust on the air side from entering the lip end, a three-dimensional shape for preventing dust intrusion is provided between the screws,
The three-dimensional shape is formed of a protrusion, and the protrusion is integrally formed on the surface on the rear side in the axial rotation direction of each screw and is discontinuous with respect to the screw on the opposite side. A sealing device characterized in that a path is set. 請求項１記載の密封装置において、
前記ネジはそれぞれ、前記リップ端近傍に設けられた断面均一の平行ネジと、前記平行ネジから連続して設けられた舟底形ネジとよりなり、
前記立体形状の突起は、前記舟底形ネジにおける長手方向中央部の軸回転方向後方側に高さ略同等の突起として一体成形されるとともに、軸回転方向に対し垂直な向きのダスト堰き止め面を有することを特徴とする密封装置。 The sealing device according to claim 1.
Each of the screws consists of a parallel screw having a uniform cross section provided near the lip end and a boat bottom screw provided continuously from the parallel screw,
The three-dimensionally shaped protrusion is integrally formed as a protrusion having a substantially equal height on the rear side in the axial rotation direction of the center portion in the longitudinal direction of the boat bottom-shaped screw, and has a dust damming surface in a direction perpendicular to the axial rotation direction. A sealing device characterized by comprising: 請求項１記載の密封装置において、
前記ネジはそれぞれ、前記リップ端近傍に設けられた断面均一の平行ネジと、前記平行ネジから連続して設けられた舟底形ネジとよりなり、
前記立体形状の突起は、前記平行ネジおよび舟底形ネジの接続部から分岐するように設けられた舟底形の突起よりなることを特徴とする密封装置。 The sealing device according to claim 1.
Each of the screws consists of a parallel screw having a uniform cross section provided near the lip end and a boat bottom screw provided continuously from the parallel screw,
3. The sealing device according to claim 1, wherein the three-dimensional projection includes a boat-bottom projection provided so as to branch from a connection portion between the parallel screw and the boat-bottom screw. 請求項１記載の密封装置において、
前記ネジはそれぞれ、前記リップ端近傍に設けられた断面均一の平行ネジと、前記平行ネジから連続して設けられた舟底形ネジとよりなり、
前記立体形状の突起は、前記平行ネジおよび舟底形ネジの接続部から分岐するように設けられた断面均一の突起よりなることを特徴とする密封装置。 The sealing device according to claim 1.
Each of the screws consists of a parallel screw having a uniform cross section provided near the lip end and a boat bottom screw provided continuously from the parallel screw,
The three-dimensional projection is a projection having a uniform cross section provided so as to branch from a connecting portion of the parallel screw and the boat bottom screw. 請求項１、２、３または４記載の密封装置において、
前記ネジはそれぞれ、前記リップ端近傍に設けられた断面均一の平行ネジと、前記平行ネジから連続して設けられた舟底形ネジとよりなり、
前記立体形状の突起は、前記平行ネジおよび舟底形ネジの接続部から分岐するように設けられた突起よりなり、
更に、前記舟底形ネジの大気側端部に、前記舟底形ネジと反対の向きに傾斜した反対向きネジが設けられていることを特徴とする密封装置。 The sealing device according to claim 1, 2, 3 or 4,
Each of the screws consists of a parallel screw having a uniform cross section provided near the lip end and a boat bottom screw provided continuously from the parallel screw,
The three-dimensional projection is a projection provided so as to branch from the connecting portion of the parallel screw and the boat bottom screw,
The sealing device according to claim 1, further comprising an opposite-direction screw inclined in an opposite direction to the boat-bottom screw at an atmosphere side end of the boat-bottom screw.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016040472A (en) * 2014-08-12 2016-03-24 Nok株式会社 Sealing device
KR101807273B1 (en) 2015-12-18 2017-12-08 평화오일씰공업주식회사 Shaft seal
JP2018035891A (en) * 2016-09-01 2018-03-08 Nok株式会社 Seal

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3278349B2 (en) * 1995-05-25 2002-04-30 エヌオーケー株式会社 Sealing device
JP2007270857A (en) * 2006-03-30 2007-10-18 Arai Pump Mfg Co Ltd Sealing device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3278349B2 (en) * 1995-05-25 2002-04-30 エヌオーケー株式会社 Sealing device
JP2007270857A (en) * 2006-03-30 2007-10-18 Arai Pump Mfg Co Ltd Sealing device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016040472A (en) * 2014-08-12 2016-03-24 Nok株式会社 Sealing device
KR101807273B1 (en) 2015-12-18 2017-12-08 평화오일씰공업주식회사 Shaft seal
JP2018035891A (en) * 2016-09-01 2018-03-08 Nok株式会社 Seal

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