JP2009250310A

JP2009250310A - Oil seal and installing structure of oil seal

Info

Publication number: JP2009250310A
Application number: JP2008097488A
Authority: JP
Inventors: Rikio Kato; 力雄加藤; Toshihiko Suzuki; 年彦鈴木; Akifumi Nishi; 章文西; Yuka Hiromatsu; 由香廣松; Mitsuji Kimura; 充志木村; Shigetaka Ishizaki; 重隆石▲崎▼; Yosuke Ueda; 陽介植田; Tetsuji Kitano; 哲司北野; Takashi Teranuma; 考寺沼
Original assignee: Osaka Gas Co Ltd; Tokyo Gas Co Ltd; Yazaki Corp; Toho Gas Co Ltd
Current assignee: Osaka Gas Co Ltd; Tokyo Gas Co Ltd; Yazaki Corp; Toho Gas Co Ltd
Priority date: 2008-04-03
Filing date: 2008-04-03
Publication date: 2009-10-29

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil seal having no directionality, high in seal performance and low in rotating friction. <P>SOLUTION: Oil lips 2b of the same shape are provided at opposite ends of a hole 2a of a circular seal body 2 formed of an elastic material. A rib-like outer diameter seal 2c is provided at a middle between opposite ends on an outer peripheral surface of the circular seal body 2 over its entire circumference, a first concave 2d is formed between the two oil lips 2b and second concaves 2e are formed between an outer peripheral side and the two oil lips 2b at the circular seal body 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、オイルシールおよびオイルシールの取付構造に関するものである。 The present invention relates to an oil seal and an oil seal mounting structure.

図３は、従来のオイルシールを示す断面図である。このオイルシール１０は、図示しない被取付部材の回転軸が嵌合する内周の穴部１０ａの一方の端部に形成されたオイルリップ部１０ｂによりシール性を確保し、一方方向（矢印Ａ）からはシール性が有効であるが、反対側の方向（矢印Ｂ）からのシール性はない。 FIG. 3 is a cross-sectional view showing a conventional oil seal. This oil seal 10 ensures sealing performance by an oil lip portion 10b formed at one end of an inner peripheral hole portion 10a into which a rotating shaft of a mounted member (not shown) is fitted, and is in one direction (arrow A). Is effective in sealing, but not in the opposite direction (arrow B).

したがって、回転軸への装着時に方向性を生ずることになり、取り付け方向を間違う誤組付けの発生を排除できない。また、外径シール部１０ｃがフラットであるため、外径シール部と接するハウジング等の被装着部材との間のシール性を確保するため装着に大きな力を必要とし、装着による外径の変形が穴部１０ａの内径を縮小する方向に作用して回転軸の摩擦抵抗が増加することになるという問題がある。 Therefore, directionality is generated when the rotating shaft is mounted, and it is impossible to eliminate the occurrence of incorrect assembly in the wrong mounting direction. Further, since the outer diameter seal portion 10c is flat, a large force is required for mounting in order to ensure sealing performance between the outer diameter seal portion and a mounted member such as a housing, and deformation of the outer diameter due to mounting is required. There is a problem that the frictional resistance of the rotating shaft is increased by acting in the direction of reducing the inner diameter of the hole 10a.

そこで本発明は、上述した問題点に鑑み、方向性がなくシール性が高くて回転摩擦が低いオイルシールを提供することを課題としている。 In view of the above-described problems, an object of the present invention is to provide an oil seal that has no directionality, high sealing performance, and low rotational friction.

上記課題を解決するため本発明によりなされた請求項１記載のオイルシールは、弾性材料からなる環状シール本体２の穴部２ａの両端に、それぞれ、同一形状のオイルリップ部２ｂが設けられていることを特徴とする。 In order to solve the above-mentioned problem, the oil seal according to claim 1 made according to the present invention is provided with oil lip portions 2b having the same shape at both ends of the hole portion 2a of the annular seal body 2 made of an elastic material. It is characterized by that.

上記課題を解決するためなされた請求項２記載の発明は、請求項１記載のオイルシールにおいて、前記環状シール本体２の外周面における前記両端からの中間に前記外周面の全周にわたって、リブ状の外径シール部２ｃが設けられ、２つの前記オイルリップ部２ｂ間に第１の凹部２ｄが形成され、前記環状シール本体２における外周側と前記２つのオイルリップ部２ｂとの間に、それぞれ、第２の凹部２ｅが形成されていることを特徴とする。 According to a second aspect of the present invention, there is provided an oil seal according to the first aspect, wherein a rib shape is formed over the entire circumference of the outer peripheral surface in the middle from the both ends of the outer peripheral surface of the annular seal body 2. The outer diameter seal portion 2c is provided, and a first recess 2d is formed between the two oil lip portions 2b. Between the outer peripheral side of the annular seal body 2 and the two oil lip portions 2b, respectively. The second recess 2e is formed.

上記課題を解決するため本発明によりなされた請求項３記載のオイルシール取付構造は、回転軸４を収納するハウジング３のオイルシール取付部３ｂに請求項１または２に記載のオイルシール１を嵌合し、前記穴部２ａに前記回転軸４を嵌合したことを特徴とする。 In order to solve the above-mentioned problems, the oil seal mounting structure according to claim 3, which is made according to the present invention, fits the oil seal 1 according to claim 1 or 2 into the oil seal mounting portion 3 b of the housing 3 that houses the rotating shaft 4. In addition, the rotary shaft 4 is fitted into the hole 2a.

上記課題を解決するためなされた請求項４記載の発明は、請求項４記載のオイルシールの取付構造において、前記第１の凹部２ｄに回転摩擦低減用グリスが収容されていることを特徴とする。 According to a fourth aspect of the present invention, there is provided the oil seal mounting structure according to the fourth aspect, wherein a rotational friction reducing grease is accommodated in the first recess 2d. .

なお、上述の課題を解決するための手段の説明における参照符号は、以下の発明を実施するための最良の形態の説明における参照符号に対応しているが、これらは、特許請求の範囲の解釈を限定するものではない。 The reference numerals in the description of the means for solving the above-described problems correspond to the reference numerals in the following description of the best mode for carrying out the invention, but these are the interpretations of the claims. It is not intended to limit.

請求項１に記載した本発明のオイルシールによれば、穴部両端に設けられた同一形状の２つのオイルリップ部が作用して、穴部の両方向からのシールが可能であり、装着に方向性がない。したがって、方向性を間違う誤組付けの発生が無く、シール性喪失による製品の機能不良の発生を排除できる。また、２つのオイルリップ部があるので、シール性が高い。 According to the oil seal of the present invention described in claim 1, two oil lip portions having the same shape provided at both ends of the hole portion act, and sealing from both directions of the hole portion is possible. There is no sex. Therefore, there is no occurrence of erroneous assembly with a wrong directionality, and the occurrence of product malfunction due to loss of sealing performance can be eliminated. Moreover, since there are two oil lip portions, the sealing performance is high.

請求項２に記載した本発明のオイルシールによれば、リブ状の外径シール部を設け、第１および第２の凹部による、オイルリップ部や外径シール部の変形に伴う逃がしが設けられているため、装着時の変形・縮小が少ないので、低い回転摩擦力で回転軸のシールが可能となる。 According to the oil seal of the present invention described in claim 2, the rib-shaped outer diameter seal portion is provided, and the relief due to the deformation of the oil lip portion and the outer diameter seal portion is provided by the first and second recesses. Therefore, since the deformation / reduction at the time of mounting is small, the rotary shaft can be sealed with a low rotational frictional force.

請求項３に記載した発明のオイルシールの取付構造によれば、回転軸を収納するハウジングの内壁に本発明のオイルシールを嵌合し、穴部に回転軸を嵌合するので、オイルシールの取り付け時の方向性を間違う誤組付けの発生が無く、シール性喪失による製品の機能不良の発生を排除できる。 According to the oil seal mounting structure of the invention described in claim 3, the oil seal of the present invention is fitted to the inner wall of the housing for housing the rotary shaft, and the rotary shaft is fitted to the hole. It is possible to eliminate the occurrence of incorrect assembly due to the loss of sealing performance without the occurrence of incorrect assembly in the direction of installation.

請求項４に記載した発明のオイルシールの取付構造によれば、第１の凹部には回転摩擦低減用グリスが溜まっており、回転摩擦力の低減に作用させることができる。 According to the oil seal mounting structure of the fourth aspect of the present invention, the rotational friction reducing grease is accumulated in the first recess, and can be applied to the reduction of the rotational friction force.

以下、本発明について図面を参照して説明する。図１は、本発明のオイルシールの実施の形態を示す断面図である。オイルシール１は、ＮＢＲ（ニトリルゴム）等の弾性材料からなる環状シール本体２において、内周側の穴部２ａの両端部に、それぞれ、同一形状のオイルリップ部２ｂが設けられている。また、環状シール本体２のフラットな外周面における両端からの中間に、外周面の全周にわたってリブ状の外径シール部２ｃが設けられている。 The present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of an oil seal of the present invention. The oil seal 1 is an annular seal body 2 made of an elastic material such as NBR (nitrile rubber), and oil lip portions 2b having the same shape are provided at both ends of the hole portion 2a on the inner peripheral side. Further, a rib-shaped outer diameter seal portion 2c is provided over the entire circumference of the outer peripheral surface in the middle from both ends of the flat outer peripheral surface of the annular seal body 2.

さらに、２つのオイルリップ部２ｂ間に、穴部２ａの内径が大きくなるように湾曲した凹部２ｄ（第１の凹部）が形成され、環状シール本体２における外周側と２つのオイルリップ部２ｂとの間に、それぞれ、湾曲した凹部２ｅ（第２の凹部）が形成されている。オイルシール１の形状は、穴部２ａの中心を通る軸線と、外径シール部２ｃの中間を通ってこの軸線と直交する直交線とに対して、線対称になっている。 Further, a concave portion 2d (first concave portion) curved so as to increase the inner diameter of the hole portion 2a is formed between the two oil lip portions 2b, and the outer peripheral side of the annular seal body 2 and the two oil lip portions 2b, Between the two, curved concave portions 2e (second concave portions) are formed. The shape of the oil seal 1 is axisymmetric with respect to an axis passing through the center of the hole 2a and an orthogonal line passing through the middle of the outer diameter seal 2c and orthogonal to the axis.

次に、図２は、本発明のオイルシールの取付構造を説明する断面図である。オイルシール１は、製品、たとえばガス遮断装置、のハウジング３に一体形成されてその内周側に軸受５が嵌合される円筒状軸受取付部３ａの下に形成された円形凹部であるオイルシール取付部３ｂに嵌合される。回転軸４は、軸受５で支持されて、一方の端部がハウジング３の内部に収納されると共に、オイルシール１を介して外部に露出している。この回転軸４は、遮断弁となるボール状弁体を回転駆動する駆動軸として働くものであり、内部に収納された一方の端部に、駆動軸の駆動源となるモータのギヤ伝達機構の一部を構成するギヤ６が嵌合されている。図示しないが、回転軸４の外部へ露出した方の端部は、ボール状弁体に接続されている。 Next, FIG. 2 is a cross-sectional view illustrating the oil seal mounting structure of the present invention. The oil seal 1 is a circular recess formed integrally with a housing 3 of a product, for example, a gas shut-off device, and formed under a cylindrical bearing mounting portion 3a into which a bearing 5 is fitted. The fitting part 3b is fitted. The rotating shaft 4 is supported by a bearing 5, and one end portion is accommodated in the housing 3 and exposed to the outside through the oil seal 1. The rotating shaft 4 serves as a driving shaft for rotationally driving a ball-shaped valve element that serves as a shut-off valve, and is provided at one end housed inside the motor transmission mechanism of a motor that serves as a driving source for the driving shaft. A gear 6 constituting a part is fitted. Although not shown, the end of the rotating shaft 4 exposed to the outside is connected to a ball-shaped valve element.

オイルシール１の外径シール部２ｃは、オイルシール取付部３ｂに嵌合された際にその内壁に密着してハウジング３側のシール性を維持する。オイルシール１のオイルリップ部２ｂは、回転軸４が嵌合された際にその外周と密接に接する。 When the outer diameter seal portion 2c of the oil seal 1 is fitted to the oil seal mounting portion 3b, the outer seal portion 2c is brought into close contact with the inner wall to maintain the sealing performance on the housing 3 side. The oil lip 2b of the oil seal 1 is in close contact with the outer periphery of the rotating shaft 4 when it is fitted.

オイルシール１の凹部２ｄは、オイルシール１をオイルシール取付部３に嵌合する際の外径シール部２ｃの変形の逃がしとして働き、また、凹部２ｅは、回転軸４が嵌合される際のオイルリップ部２ｂの変形の逃がしとして働く。 The concave portion 2d of the oil seal 1 serves as a relief of deformation of the outer diameter seal portion 2c when the oil seal 1 is fitted to the oil seal mounting portion 3, and the concave portion 2e is provided when the rotary shaft 4 is fitted. The oil lip 2b functions as a relief for deformation.

外部側のオイルリップ部２ｂは、回転軸４の外部側のシール性を確保し、内部側のオイルリップ部２ｂは、回転軸４の内部側のシール性を確保する。その結果、オイルシール１は、軸受５側からの潤滑用グリスの外部への流出と、外部からの異物や水の侵入を防止する。 The oil lip 2b on the outer side ensures a sealing property on the outer side of the rotating shaft 4, and the oil lip 2b on the inner side ensures a sealing property on the inner side of the rotating shaft 4. As a result, the oil seal 1 prevents the lubricating grease from flowing out from the bearing 5 side, and prevents foreign matter and water from entering from the outside.

このように、本発明によれば、回転軸４のシールには２つのオイルリップ部２ｂが作用して、穴部２ａの２方向からのシールが可能であり、装着の際に方向性がない。したがって、方向性を間違う誤組付けの発生が無く、シール性喪失による製品の機能不良の発生を排除できる。また、外径シール部２ｃやオイルリップ部２ｂ変形に伴う逃がしが設けられているため、装着時の変形・縮小がないので、低い回転摩擦力で回転軸のシールが可能となる。 Thus, according to the present invention, the two oil lip portions 2b act on the seal of the rotating shaft 4 so that the holes 2a can be sealed from two directions, and there is no directionality when mounting. . Therefore, there is no occurrence of erroneous assembly with a wrong directionality, and the occurrence of product malfunction due to loss of sealing performance can be eliminated. Further, since the relief associated with the deformation of the outer diameter seal portion 2c and the oil lip portion 2b is provided, there is no deformation / reduction at the time of mounting, so that the rotation shaft can be sealed with a low rotational frictional force.

以上の通り、本発明の実施の形態について説明したが、本発明はこれに限らず、種々の変形、応用が可能である。 As described above, the embodiment of the present invention has been described. However, the present invention is not limited to this, and various modifications and applications are possible.

たとえば、凹部２ｄに回転軸４との回転摩擦低減用グリスを収容しても良い。この場合は、凹部２ｄは、外径シール部２ｃの変形の逃がしとして働くと共にグリス溜まりの機能も有する。そして、凹部２ｄには、常に回転摩擦低減用グリスが溜まっており、回転軸４との回転摩擦力低減に作用することになる。 For example, grease for reducing rotational friction with the rotating shaft 4 may be accommodated in the recess 2d. In this case, the concave portion 2d functions as a relief of deformation of the outer diameter seal portion 2c and also has a function of collecting grease. The recess 2d always accumulates rotational friction reducing grease, which acts to reduce rotational frictional force with the rotary shaft 4.

本発明の実施の形態に係るオイルシールの構成を示す断面図である。It is sectional drawing which shows the structure of the oil seal which concerns on embodiment of this invention. 本発明に実施の形態に係るオイルシールの取付構造を示す断面図である。It is sectional drawing which shows the attachment structure of the oil seal which concerns on embodiment of this invention. 従来のオイルシールの構成を示す断面図である。It is sectional drawing which shows the structure of the conventional oil seal.

Explanation of symbols

１オイルシール
２環状シール本体
２ａ穴部
２ｂオイルリップ部
２ｃ外径シール部
２ｄ凹部（第１の凹部）
２ｅ凹部（第２の凹部）
３ハウジング
４回転軸 1 oil seal 2 annular seal body 2a hole 2b oil lip 2c outer diameter seal 2d recess (first recess)
2e recess (second recess)
3 Housing 4 Rotating shaft

Claims

An oil seal characterized in that oil lip portions having the same shape are provided at both ends of a hole portion of an annular seal body made of an elastic material.

The oil seal according to claim 1,
A rib-like outer diameter seal portion is provided over the entire circumference of the outer peripheral surface in the middle from the both ends of the outer peripheral surface of the annular seal body, and a first recess is formed between the two oil lip portions, An oil seal, wherein a second recess is formed between the outer peripheral side of the annular seal body and the two oil lip portions.

An oil seal mounting structure in which the oil seal according to claim 1 or 2 is fitted to an oil seal mounting portion of a housing that houses the rotary shaft, and the rotary shaft is fitted into the hole.

In the oil seal mounting structure according to claim 3,
An oil seal mounting structure, wherein rotational friction reducing grease is accommodated in the first recess.