JPH11141689A - Sealing device - Google Patents
Sealing deviceInfo
- Publication number
- JPH11141689A JPH11141689A JP9305231A JP30523197A JPH11141689A JP H11141689 A JPH11141689 A JP H11141689A JP 9305231 A JP9305231 A JP 9305231A JP 30523197 A JP30523197 A JP 30523197A JP H11141689 A JPH11141689 A JP H11141689A
- Authority
- JP
- Japan
- Prior art keywords
- annular
- sealing device
- projections
- shaped
- shaped lip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Sealing With Elastic Sealing Lips (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、バックアップリン
グを備えた密封装置に関する。この密封装置は、例えば
自動車のパワーステアリングロッド用のオイルシールな
どとして用いられる。The present invention relates to a sealing device provided with a backup ring. This sealing device is used, for example, as an oil seal for a power steering rod of an automobile.
【０００２】[0002]
【従来の技術】従来のこの種の密封装置の構造を図５に
示す。図例の密封装置において、１は環状芯金、２はシ
ール本体、３はバネリング、４はバックアップリングで
ある。2. Description of the Related Art The structure of a conventional sealing device of this type is shown in FIG. In the illustrated sealing device, 1 is an annular core, 2 is a seal body, 3 is a spring ring, and 4 is a backup ring.
【０００３】環状芯金１は、断面ほぼ逆さＬ字形に板金
加工された金属材からなる。この環状芯金１において、
１ａは円筒部、１ｂは円筒部１ａの軸方向一端から径方
向内向きに延びる環状板部である。The annular metal core 1 is made of a metal material processed into a sheet metal having an approximately L-shaped cross section. In this annular core 1,
1a is a cylindrical portion, and 1b is an annular plate portion extending radially inward from one axial end of the cylindrical portion 1a.
【０００４】シール本体２は、ニトリルゴム（ＮＢＲ）
や水素添加ニトリルゴム（ＨＮＢＲ）などの合成ゴムな
どの弾性材からなり、環状芯金１の円筒部１ａおよび環
状板部１ｂに対して加硫接着（焼き付け）されている。
このシール本体２において、２ａは環状芯金１の円筒部
１ａの外周面に接着されたシール外周部、２ｂは環状芯
金１の環状板部１ｂの内周側から軸方向一方へ向けて延
出する延出部、２ｃは延出部２ｂの外周の周溝、２ｄは
延出部２ｂの内周に設けられるＶ字リップである。The seal body 2 is made of nitrile rubber (NBR)
And an elastic material such as synthetic rubber such as hydrogenated nitrile rubber (HNBR), and is vulcanized and bonded (baked) to the cylindrical portion 1a and the annular plate portion 1b of the annular cored bar 1.
In the seal body 2, reference numeral 2 a denotes a seal outer peripheral portion bonded to the outer peripheral surface of the cylindrical portion 1 a of the annular core 1, and 2 b extends from the inner peripheral side of the annular plate portion 1 b of the annular core 1 toward one axial direction. The extending portion 2c protruding is a circumferential groove on the outer periphery of the extending portion 2b, and 2d is a V-shaped lip provided on the inner periphery of the extending portion 2b.
【０００５】バネリング３は、いわゆるガータスプリン
グと呼ばれるもので、延出部２ｂの周溝２ｃに嵌合され
て延出部２ｂを径方向内向きに締め付けるものである。The spring ring 3 is a so-called garter spring, which is fitted in the circumferential groove 2c of the extension 2b and tightens the extension 2b radially inward.
【０００６】バックアップリング４は、ナイロンなどの
合成樹脂により成形されたもので、延出部２ｂの反転を
防止するために、延出部２ｂの付け根側内周と環状芯金
１の環状板部１ｂとの間に形成される凹み部分に嵌合さ
れている。The backup ring 4 is made of a synthetic resin such as nylon, and has an inner periphery at the base of the extension 2b and an annular plate of the annular core 1 to prevent the extension 2b from being inverted. 1b.
【０００７】このような密封装置は、その環状芯金１の
環状板部１ｂが外部側に、延出部２ｂの自由端側が密封
対象側に配置され、シール外周部２ａがハウジング１０
の内周面に、また、延出部２ｂのＶ字リップ２ｄがロッ
ド２０の外周面にそれぞれ弾性変形した状態で当接させ
られる。さらに、バックアップリング４の内周面がロッ
ド２０の外周面に対して微小隙間を介して対向させられ
る。In such a sealing device, the annular plate portion 1b of the annular cored bar 1 is arranged on the outside, the free end of the extension 2b is arranged on the side to be sealed, and the outer peripheral portion 2a of the seal is
And the V-shaped lip 2d of the extending portion 2b is brought into contact with the outer peripheral surface of the rod 20 while being elastically deformed. Further, the inner peripheral surface of the backup ring 4 is opposed to the outer peripheral surface of the rod 20 via a minute gap.
【０００８】そして、パワーステアリング装置の駆動に
伴いロッド２０が軸方向に往復変位することにより、こ
のロッド２０の外周面に対してＶ字リップ２ｄが摺接す
る。When the power steering apparatus is driven, the rod 20 reciprocates in the axial direction, so that the V-shaped lip 2d slides on the outer peripheral surface of the rod 20.
【０００９】このとき、バックアップリング４により延
出部２ｂの撓みを規制するとともに反転を防止する。At this time, the bending of the extension 2b is restricted by the backup ring 4 and the inversion is prevented.
【００１０】ところで、上記従来の密封装置では、ロッ
ド２０の動作時の摺動抵抗を軽減して、「鳴き」と呼ば
れる異音発生を抑制する構成が取り入れられている。つ
まり、延出部２ｂの内周面においてＶ字リップ２ｄの付
け根側円錐面に周方向に連続する輪状突起２ｅを軸方向
所要間隔おきに３つ設けることにより、それらの間に存
在する凹み部分にロッド２０の外周面に付着している潤
滑油を貯溜させるようにしている。この凹み部分に貯溜
される潤滑油は、ロッド２０の軸方向変位に伴い延出部
２ｂとロッド２０との間の摺接部位に所要量ずつ引き出
されて、この摺接部位に潤滑油膜を形成する。Incidentally, the above-described conventional sealing device employs a configuration in which the sliding resistance during the operation of the rod 20 is reduced to suppress the generation of abnormal noise called "squeal". In other words, by providing three annular projections 2e that are continuous in the circumferential direction on the inner peripheral surface of the V-shaped lip 2d on the inner peripheral surface of the extending portion 2b at required intervals in the axial direction, a concave portion existing between them is provided. The lubricating oil adhering to the outer peripheral surface of the rod 20 is stored therein. The lubricating oil stored in the recessed portion is drawn out by a required amount to a sliding contact portion between the extending portion 2b and the rod 20 according to the axial displacement of the rod 20, and a lubricating oil film is formed on the sliding contact portion. I do.
【００１１】ここで、前述の輪状突起２ｅの詳細を図６
ないし図８に示して説明する。ここで、３つの環状突起
２ｅを区別するために、Ｖ字リップ２ｄの頂点側から遠
ざかる順番に、第１の輪状突起２ｅ1、第２の輪状突起
２ｅ2、第３の輪状突起２ｅ3とする。そして、第１の輪
状突起２ｅ1と第２の輪状突起２ｅ2との間に第１の凹部
２ｆ1が、また、第２の輪状突起２ｅ2と第３の輪状突起
２ｅ3との間に第２の凹部２ｆ2が存在する。Here, the details of the aforementioned annular projection 2e are shown in FIG.
8 will be described. Here, in order to distinguish the three annular projections 2e, the first annular projection 2e 1 , the second annular projection 2e 2 , and the third annular projection 2e 3 are arranged in the order away from the apex side of the V-shaped lip 2d. I do. The first recess 2f 1 between the first and annular protrusion 2e 1 and the second annular protrusion 2e 2 is also provided between the second annular protrusion 2e 2 and the third annular projection 2e 3 There is a second recess 2f2.
【００１２】各輪状突起２ｅ1〜２ｅ3の断面形状は、部
分円弧状（中心角は１８０度未満）となっており、延出
部２ｂの延出方向での幅寸法Ｗおよび延出部２ｂの付け
根側円錐面からの突出高さ寸法ｈは互いに等しく、隣接
間隔ＳおよびピッチＰも互いに等しく設定されている。
Ｒは各輪状突起２ｅ1〜２ｅ3の半径、その曲率中心は延
出部２ｂの付け根側円錐面より内部に位置している。Ｌ
はＶ字リップ２ｂ2 の頂点Ａから第１の輪状突起２ｅ1
の中心までの間隔である。[0012] The cross-sectional shape of each annular protrusion 2e 1 ~2e 3, partial arc shape (central angle less than 180 degrees) has a width dimension W and the extension portion 2b in the extending direction of the extending portion 2b The heights h of the protrusions from the base side conical surface are equal to each other, and the adjacent distance S and the pitch P are also set to be equal to each other.
R is the radius, the center of curvature of each annular protrusion 2e 1 ~2e 3 is located inside from the base side conical surface of the extension portion 2b. L
The first annular protrusion 2e from the apex A of the V-shaped lip 2b 2 1
Is the distance to the center of
【００１３】そして、実際の使用状況では、図７に示す
ように、延出部２ｂが撓んでその内周面におけるＶ字リ
ップ２ｄの付け根側円錐面がロッド２０の外周面に対し
て圧接させられることになる。この状態では、各輪状突
起２ｅ1〜２ｅ3が微小であるため、第１の輪状突起２ｅ
1がほとんど潰れ、第２、第３の輪状突起２ｅ2，２ｅ3
が僅かに残る。これにより、第１、第２の凹部２ｆ1，
２ｆ2が僅かに残り、ここに潤滑油が溜められることに
なる。In an actual use condition, as shown in FIG. 7, the extension 2b is bent and the root-side conical surface of the V-shaped lip 2d on its inner peripheral surface is pressed against the outer peripheral surface of the rod 20. Will be done. Since in this state, the respective annular projections 2e 1 ～2E 3 is very small, the first annular protrusion 2e
1 is almost crushed, and the second and third annular projections 2e 2 and 2e 3
Slightly remains. Thereby, the first and second recesses 2f 1 ,
A small amount of 2f 2 remains, and lubricating oil is stored here.
【００１４】[0014]
【発明が解決しようとする課題】ところで、近年、自動
車のパワーステアリングロッド用の密封装置の使用箇所
については、密封流体（潤滑油）の高圧・高温化および
コンパクト化が進み、使用条件が厳しいものとなってき
ている。In recent years, the use of sealing devices for power steering rods in automobiles has been increasing under high pressure, high temperature and compactness of the sealing fluid (lubricating oil), and the use conditions are severe. It is becoming.
【００１５】このため、上述した従来の密封装置の場
合、図８に示すように、第１〜第３の輪状突起２ｅ1〜
２ｅ3のすべてがほぼ完全に押し潰され、第１、第２の
凹部２ｆ1，２ｆ2が存在しなくなる。これにより、延出
部２ｂとロッド２０との摺接部位において潤滑油膜が形
成されなくなり、摺動抵抗が増大して異音が発生するこ
とになる。これに伴い、各輪状突起２ｅ1〜２ｅ3の摩耗
が進行しやすくなるので、密封性が劣化することにな
る。Therefore, in the case of the above-mentioned conventional sealing device, as shown in FIG. 8, the first to third ring-shaped projections 2e 1 to 2e 1 are formed .
All 2e 3 is almost completely crushed, first, the second recess 2f 1, 2f 2 no longer exists. As a result, a lubricating oil film is not formed at the sliding contact portion between the extending portion 2b and the rod 20, and the sliding resistance increases, thereby generating abnormal noise. Accordingly, the wear of the annular projections 2e 1 ~2e 3 is likely to proceed, so that the sealing performance is deteriorated.
【００１６】したがって、本発明は、密封装置におい
て、過大圧力作用時における異音発生の抑制と耐摩耗性
の向上を図ることを目的としている。SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to suppress abnormal noise generation and improve abrasion resistance in a sealing device when an excessive pressure is applied.
【００１７】[0017]
【課題を解決するための手段】本発明の請求項１の密封
装置は、環状芯金の内周側に軸方向一方へ延出する弾性
材製の延出部を被着してなるもので、延出部の自由端側
内周に径方向中心へ向けて先鋭となるＶ字リップが設け
られ、このＶ字リップにおける延出部付け根側の円錐面
に４つ以上の輪状突起が軸方向所要間隔おきに設けら
れ、各輪状突起の軸方向幅がＶ字リップの頂点から遠い
ものほど大きく設定されている。According to a first aspect of the present invention, there is provided a sealing device comprising an annular core having an elastic portion extending in one axial direction on an inner peripheral side thereof. A V-shaped lip that is sharpened toward the center in the radial direction is provided on the inner circumference of the free end of the extension, and four or more annular projections are formed on the conical surface of the V-shaped lip at the base of the extension in the axial direction. It is provided at required intervals, and the axial width of each annular projection is set to be larger as it is farther from the apex of the V-shaped lip.
【００１８】本発明の請求項２の密封装置は、上記請求
項１の各輪状突起の突出高さが互いにほぼ等しく設定さ
れている。In the sealing device according to a second aspect of the present invention, the projecting heights of the annular projections are set to be substantially equal to each other.
【００１９】本発明の請求項３の密封装置は、上記請求
項１または２の各輪状突起の断面形状を部分円弧状と
し、その半径寸法を可変して輪状突起の軸方向幅を管理
している。According to a third aspect of the present invention, there is provided a sealing device according to the first or second aspect, wherein each of the annular projections has a partially arcuate cross-sectional shape, and a radial dimension of the annular projection is varied to control an axial width of the annular projection. I have.
【００２０】以上、要するに、本発明では、延出部の内
周面においてＶ字リップの付け根側円錐面という限られ
た寸法の領域に、できるだけ多い数の輪状突起を設ける
ことにより、軸体に対する延出部の接触圧を分散し、輪
状突起１つ当たりが受ける押し潰し荷重を相対的に小さ
くして輪状突起を潰れにくくさせている。しかも、輪状
突起のうち、Ｖ字リップから遠ざかるものほど軸方向幅
を大きく設定することにより、より潰れにくくしてい
る。これにより、軸方向で隣り合う輪状突起それぞれの
間の凹み部分が残存しやすくなり、潤滑油の貯溜が可能
となる。このため、延出部と軸体との摺接部位に潤滑油
膜が形成され続けることになり、摺動抵抗が軽減される
ことになる。In summary, according to the present invention, as many ring-shaped projections as possible are provided in the limited area of the conical surface at the base of the V-shaped lip on the inner peripheral surface of the extension, so that the shaft body The contact pressure of the extending portion is dispersed, and the crushing load received per ring-shaped projection is relatively reduced, so that the ring-shaped projection is hardly crushed. Moreover, among the ring-shaped protrusions, those that are farther away from the V-shaped lip are set to have a larger axial width, so that the protrusions are harder to collapse. This makes it easier for the recessed portion between the annular projections adjacent in the axial direction to remain, thereby allowing the lubricating oil to be stored. For this reason, the lubricating oil film continues to be formed at the sliding contact portion between the extension portion and the shaft body, and the sliding resistance is reduced.
【００２１】特に、請求項３では、輪状突起の断面形状
を矩形や台形とする場合に比べて軸体に圧接された状態
で均等に潰れやすくなり、接触形態が安定するようにな
り、軸体の動きをスムーズに案内しやすくなる。In particular, in the third aspect, as compared with the case where the cross-sectional shape of the annular projection is rectangular or trapezoidal, the annular projection is easily crushed even when pressed against the shaft, and the contact form is stabilized, and It is easy to guide the movement of the person smoothly.
【００２２】[0022]
【発明の実施の形態】本発明の詳細を図１ないし図４に
示す実施形態に基づいて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS.
【００２３】図１ないし図４は本発明の一実施形態にか
かり、図１は、密封装置を示す上半分の縦断面図、図２
は、Ｖ字リップの拡大図、図３は、Ｖ字リップの通常使
用時の様子を示す拡大図、図４は、Ｖ字リップに対して
過大圧力が作用したときの様子を示す拡大図である。FIGS. 1 to 4 relate to an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of an upper half showing a sealing device.
Is an enlarged view of a V-shaped lip, FIG. 3 is an enlarged view showing a state of the V-shaped lip during normal use, and FIG. 4 is an enlarged view showing a state of an excessively large pressure applied to the V-shaped lip. is there.
【００２４】これらの図において従来例として提示した
図５と同一もしくは対応する部分に同一符号を付してあ
る。図中、符号１は環状芯金、２はシール本体、３はバ
ネリング、４はバックアップリング、１０はハウジン
グ、２０はロッドである。In these figures, the same or corresponding parts as those in FIG. 5 presented as a conventional example are denoted by the same reference numerals. In the drawing, reference numeral 1 denotes an annular core, 2 denotes a seal body, 3 denotes a spring ring, 4 denotes a backup ring, 10 denotes a housing, and 20 denotes a rod.
【００２５】この実施形態１において従来例との相違
は、シール本体２の延出部２ｂの内周面における輪状突
起２ｅの配設形態である。The first embodiment differs from the conventional example in the arrangement of the annular projection 2e on the inner peripheral surface of the extension 2b of the seal body 2.
【００２６】すなわち、延出部２ｂの内周面におけるＶ
字リップ２ｄの付け根側円錐面に周方向に連続する輪状
突起２ｅが軸方向所要間隔おきに５つ設けられている。That is, V on the inner peripheral surface of the extension 2b
Five ring-shaped projections 2e that are continuous in the circumferential direction are provided on the base-side conical surface of the character lip 2d at required intervals in the axial direction.
【００２７】ここで、前述の輪状突起２ｅの詳細を図２
ないし図４に示して説明する。ここで、５つの環状突起
２ｅを区別するために、Ｖ字リップ２ｄの頂点側から遠
ざかる順番に、第１の輪状突起２ｅ1、第２の輪状突起
２ｅ2、第３の輪状突起２ｅ3、第４の輪状突起２ｅ4、
第５の輪状突起２ｅ5とする。そして、第１の輪状突起
２ｅ1と第２の輪状突起２ｅ2との間に第１の凹部２ｆ1
が、また、第２の輪状突起２ｅ2と第３の輪状突起２ｅ3
との間に第２の凹部２ｆ2が、第３の輪状突起２ｅ3と第
４の輪状突起２ｅ4との間に第３の凹部２ｆ3が、また、
第４の輪状突起２ｅ4と第５の輪状突起２ｅ5との間に第
４の凹部２ｆ4が存在する。Here, the details of the aforementioned annular projection 2e are shown in FIG.
4 to FIG. Here, in order to distinguish the five annular projection 2e, in turn away from the apex side of the V-shaped lip 2d, the first annular protrusion 2e 1, second annular protrusion 2e 2, third annular projection 2e 3, A fourth annular projection 2e 4 ,
The annular projection 2e 5 fifth. Then, the first concave portion 2f 1 is provided between the first annular protrusion 2e 1 and the second annular protrusion 2e 2.
But also the second annular projection 2e 2 and the third annular projection 2e 3
Second recess 2f 2 is the third recess 2f 3 between the third annular protrusion 2e 3 and fourth annular projections 2e 4, between the addition,
Fourth recess 2f 4 is present between the annular projections 2e 5 of the fourth annular protrusion 2e 4 and 5.
【００２８】各輪状突起２ｅ1〜２ｅ5の断面形状は、部
分円弧状（中心角は１８０度未満）となっており、延出
部２ｂの付け根側円錐面からの突出高さ寸法ｈ1および
各輪状突起２ｅ1〜２ｅ5のピッチＰ1については、すべ
て等しく設定されている。The cross-sectional shape of each of the ring-shaped projections 2e 1 to 2e 5 is a partial arc (the central angle is less than 180 degrees), and the height h 1 of the projection 2h of the extension 2b from the conical surface on the base side and the pitch P 1 of the annular projections 2e 1 ~2e 5, are all set equal.
【００２９】但し、５つの輪状突起２ｅ1〜２ｅ5の軸方
向での幅寸法Ｗ1〜Ｗ5および半径寸法Ｒ1〜Ｒ3は、３段
階に設定されている。つまり、第１の輪状突起２ｅ1の
幅Ｗ1、第２の輪状突起２ｅ2の幅Ｗ2、第３〜第５の輪
状突起２ｅ3〜２ｅ5の幅Ｗ3の関係は、Ｗ1＜Ｗ2＜Ｗ3に
設定されている。そして、第１の輪状突起２ｅ1の半径
Ｒ1、第２の輪状突起２ｅ2の半径Ｒ2、第３〜第５の輪
状突起２ｅ3〜２ｅ5の半径Ｒ3の関係は、Ｒ1＜Ｒ2＜Ｒ3
に設定されている。第１の輪状突起２ｅ1の曲率中心は
延出部２ｂの付け根側円錐面の上に位置されているが、
第２〜第５の輪状突起２ｅ3〜２ｅ5の曲率中心は延出部
２ｂの付け根側円錐面より内部に位置されている。However, the width dimensions W 1 -W 5 and the radius dimensions R 1 -R 3 in the axial direction of the five annular projections 2 e 1-2 e 5 are set in three stages. That is, the first width W 1 of the annular projections 2e 1, the width W 2 of the second annular protrusion 2e 2, the relationship of the width W 3 of the third to fifth annular protrusion 2e 3 ~2e 5 is, W 1 < W 2 <W 3 is set. The first radius R 1 of the annular projections 2e 1, the radius R 2 of the second annular protrusion 2e 2, the relationship of the radius R 3 of the third to fifth annular protrusion 2e 3 ~2e 5 is, R 1 < R 2 <R 3
Is set to The first center of curvature of the annular projection 2e 1 is located on the base side conical surface of the extension portion 2b but,
Second to fifth center of curvature of the annular protrusion 2e 3 ~2e 5 is positioned inside from the base side conical surface of the extension portion 2b.
【００３０】また、隣接間隔の関係は、Ｓ1＞Ｓ2＞Ｓ3
に設定されている。Ｌ1はＶ字リップ２ｄの頂点Ａから
第１の輪状突起２ｅ1の中心までの寸法である。The relationship between adjacent intervals is as follows: S 1 > S 2 > S 3
Is set to L 1 is a dimension from the apex A of the V-shaped lip 2d to the first central annular protrusion 2e 1.
【００３１】このような密封装置の場合、実際の使用状
況では、図３に示すように、延出部２ｂが撓んでその内
周面におけるＶ字リップ２ｄの付け根側円錐面がロッド
２０の外周面に対して圧接させられることになる。この
状態では、各輪状突起２ｅ1〜２ｅ5を延出部２ｂの付け
根側へ向けて漸次大きく設定しているため、第１〜第５
の輪状突起２ｅ1〜２ｅ5のすべてが残るようになる。こ
れにより、第１〜第４の凹部２ｆ1〜２ｆ4がいずれも残
ることになり、ここに潤滑油が溜められることになる。In the case of such a sealing device, in an actual use condition, as shown in FIG. 3, the extension portion 2b is bent and the root-side conical surface of the V-shaped lip 2d on the inner peripheral surface is formed on the outer peripheral surface of the rod 20. It will be pressed against the surface. In this state, since being gradually larger set toward each annular protrusion 2e 1 ~2e 5 to base side of the extending portion 2b, first to fifth
All annular protrusion 2e 1 ~2e 5 is to remain a. This makes it possible first to fourth recess 2f 1 ~2f 4 of leaving both, so that the lubricating oil is accumulated here.
【００３２】ここで、密封対象側の圧力が大きくなる
と、バックアップリング４により延出部２ｂの撓みが規
制されるものの、Ｖ字リップ２ｄの付け根側円錐面がロ
ッド２０の外周面に対して強く圧接させられる。このと
き、図４に示すように、第１の輪状突起２ｅ1がほとん
ど潰れてしまうけれども、第２〜第５の輪状突起２ｅ2
〜２ｅ5が潰れずに残ることになる。Here, when the pressure on the side to be sealed increases, the bending of the extension portion 2 b is restricted by the backup ring 4, but the root-side conical surface of the V-shaped lip 2 d is strong against the outer peripheral surface of the rod 20. It is pressed. At this time, as shown in FIG. 4, although the first annular protrusion 2e 1 will almost collapsed, second to fifth annular protrusion 2e 2
~ 2e 5 will remain without being crushed.
【００３３】というのは、延出部２ｂの内周面において
Ｖ字リップ２ｄの付け根側円錐面という限られた寸法の
領域に、５つもの輪状突起２ｅ1〜２ｅ5を設けているか
ら、ロッド２０に対する延出部２ｂの接触圧が分散され
て、輪状突起１つ当たりが受ける押し潰し荷重が相対的
に小さくなるので、各輪状突起２ｅ1〜２ｅ5が潰れにく
くなる。しかも、輪状突起２ｅ1〜２ｅ5のうち、第３〜
第５の輪状突起２ｅ3〜２ｅ5の軸方向幅を大きく設定し
ているから、それらがより潰れにくくなっている。これ
により、第１〜第４の凹部２ｆ1〜２ｆ4が残存しやすく
なり、潤滑油の貯溜が可能となる。このため、延出部２
ｂとロッド２０との摺接部位に潤滑油膜が形成され続け
ることになり、摺動抵抗が軽減されることになる。微視
的に見ると、頂点Ａに近い第１，第２の輪状突起２
ｅ1，２ｅ2はほとんど押し潰されてしまうため、第１の
凹部２ｆ1は実質的に残らなくなるけれども、第３〜第
５の輪状突起２ｅ3〜２ｅ5の押し潰し量が小さくなって
いて、第２〜第４の凹部２ｆ2〜２ｆ4が残存することに
なる。このため、ロッド２０が軸方向往復変位するとき
に、ロッド２０の外周面が第２〜第４の凹部２ｆ2〜２
ｆ4から潤滑油を引き出し、ロッド２０と延出部２ｂと
の摺接領域の全域に潤滑油膜を形成するようになるの
で、摺動抵抗が軽減されることになり、ロッド２０の動
きをスムーズにするとともに、延出部２ｂの摩耗を抑制
し、しかも異音（鳴き）の発生を抑制するようになる。[0033] This is because, in a region of dimensions their limited base side conical surface of the V-shaped lip 2d in the inner circumferential surface of the extension portion 2b, because they provided an annular protrusion 2e 1 ~2e 5 five also the contact pressure of the extending portion 2b with respect to the rod 20 is distributed, since crushing loads experienced by the per annular protrusion becomes relatively small, is hardly crushed respective annular projections 2e 1 ~2e 5. Moreover, among the annular protrusion 2e 1 ~2e 5, third to
Since is set larger the axial width of the fifth annular protrusion 2e 3 ~2e 5, they are becoming more difficult to collapse. Thus, the first to become fourth recess 2f 1 ~2f 4 of likely to remain, it is possible to reservoir of lubricant. For this reason, the extension 2
The lubricating oil film continues to be formed at the sliding contact portion between b and the rod 20, and the sliding resistance is reduced. When viewed microscopically, the first and second annular protrusions 2 near the vertex A
Since e 1 and 2e 2 are almost crushed, the first concave portion 2f 1 is not substantially left, but the crush amount of the third to fifth annular projections 2e 3 to 2e 5 is small. , so that the second to fourth recesses 2f 2 ~2f 4 of remains. For this reason, when the rod 20 reciprocates in the axial direction, the outer peripheral surface of the rod 20 has the second to fourth concave portions 2f 2 to 2f 2.
Pull the lubricating oil from f 4, since as to form a lubricating oil film on the entire sliding contact area between the rod 20 and the extension portion 2b, will be sliding resistance is reduced, smooth movement of the rod 20 In addition, the wear of the extension 2b is suppressed, and the generation of abnormal noise (squeal) is suppressed.
【００３４】なお、本発明は上述した実施形態のみに限
定されるものではなく、種々な応用や変形が考えられ
る。It should be noted that the present invention is not limited to only the above-described embodiment, and various applications and modifications are conceivable.
【００３５】（１） 上記実施形態では、輪状突起の数
を５つとしているが、要は４つ以上であればよく、第５
の輪状突起２ｅ5を省略してもよいし、第６、第７と輪
状突起を増やしてもよい。また、上記実施形態では、す
べての輪状突起の突出高さを等しくしているが、Ｖ字リ
ップ２ｄの頂点Ａから遠い輪状突起ほど突出高さを漸次
大きくしてもよい。(1) In the above embodiment, the number of ring-shaped projections is five, but it is sufficient that the number is four or more.
It an annular protrusion 2e 5 of may be omitted, sixth, may be increased seventh and annular projection. In the above embodiment, the projection heights of all the ring-shaped projections are equal. However, the projection height may be gradually increased as the ring-shaped projections are farther from the vertex A of the V-shaped lip 2d.
【００３６】（２） 上記実施形態では、輪状突起の断
面形状を部分円弧状としているが、台形状、矩形状、三
角形状あるいは長円状とすることができる。(2) In the above embodiment, the cross-sectional shape of the ring-shaped projection is a partial arc, but may be a trapezoid, a rectangle, a triangle, or an ellipse.
【００３７】（３） 上記実施形態においてバネリング
３を省略した構成も本発明に含む。(3) The present invention includes a configuration in which the spring ring 3 is omitted in the above embodiment.
【００３８】[0038]
【発明の効果】請求項１ないし３の密封装置では、複数
の輪状突起のうちできるだけ多くの輪状突起を潰れにく
くさせるように工夫しているから、軸方向で隣り合う輪
状突起それぞれの間の潤滑油貯溜空間となる凹み部分を
残存させることができる。このため、軸体の軸方向変位
に伴い前記凹み部分から延出部と軸体との摺接部位へ潤
滑油を継続して供給できるようになるから、潤滑油膜を
途切れることなく形成できて、摺動抵抗を軽減できるよ
うになる。したがって、軸体の動きをスムーズにすると
ともに、延出部の摩耗を抑制し、しかも異音（鳴き）の
発生を抑制できるようになる。According to the sealing device of the first to third aspects, since as much as possible of the plurality of annular projections is devised so as not to be crushed, lubrication between the adjacent annular projections in the axial direction is achieved. A concave portion serving as an oil storage space can be left. For this reason, since the lubricating oil can be continuously supplied from the recessed portion to the sliding contact portion between the extending portion and the shaft with the axial displacement of the shaft, the lubricating oil film can be formed without interruption, The sliding resistance can be reduced. Therefore, the movement of the shaft body can be made smooth, the wear of the extension part can be suppressed, and the generation of abnormal noise (squeal) can be suppressed.
【００３９】特に、請求項３では、輪状突起の断面形状
を矩形や台形あるいは三角形とする場合に比べて軸体に
圧接された状態で均等に潰れやすくなり、接触形態が安
定するようになるなど、軸体の動きの円滑化に貢献でき
る。In particular, in the third aspect, as compared with the case where the cross-sectional shape of the ring-shaped projection is rectangular, trapezoidal or triangular, the ring-shaped projection is more likely to be evenly crushed in a state of being pressed against the shaft body, and the contact form is stabilized. , Can contribute to smooth movement of the shaft.
【００４０】このような本発明の密封装置を、例えば自
動車のパワーステアリングロッド用の密封装置とすれ
ば、ステアリングの操作性を向上できるとともに、操作
時の異音発生を抑制できるなど、信頼性の向上に貢献で
きるようになる。If the sealing device of the present invention is a sealing device for a power steering rod of an automobile, for example, the operability of the steering can be improved and the generation of abnormal noise during operation can be suppressed. You can contribute to improvement.
【図１】本発明の一実施形態の密封装置を示す上半分の
縦断面図FIG. 1 is a longitudinal sectional view of an upper half showing a sealing device according to an embodiment of the present invention.
【図２】図１のＶ字リップの拡大図FIG. 2 is an enlarged view of a V-shaped lip of FIG. 1;
【図３】図１のＶ字リップの通常使用時の様子を示す拡
大図FIG. 3 is an enlarged view showing a state of the V-shaped lip of FIG. 1 in a normal use.
【図４】図１のＶ字リップに対して過大圧力が作用した
ときの様子を示す拡大図FIG. 4 is an enlarged view showing a state when excessive pressure acts on the V-shaped lip in FIG. 1;
【図５】従来例の密封装置を示す上半分の縦断面図FIG. 5 is a longitudinal sectional view of an upper half showing a conventional sealing device.
【図６】図５のＶ字リップの拡大図FIG. 6 is an enlarged view of the V-shaped lip of FIG. 5;
【図７】従来例において図３に対応する図FIG. 7 is a diagram corresponding to FIG. 3 in a conventional example.
【図８】従来例において図４に対応する図FIG. 8 is a diagram corresponding to FIG. 4 in a conventional example.
１ 環状芯金 １ａ 環状芯金の円筒部 １ｂ 環状芯金の環状板部 ２ シール本体 ２ａ シール外周部 ２ｂ 延出部 ２ｄ Ｖ字リップ ２ｅ1〜２ｅ5 輪状突起 ２ｆ1〜２ｆ4 油溜め用凹部 ３ バネリング ４ バックアップリング ４ａ 凹部 １０ ハウジング ２０ ロッドFirst annular core metal 1a annular plate portion 2 seal body 2a seal perimeter 2b extending portion 2d V-shaped lip 2e 1 ~2e 5 annular protrusion 2f 1 ~2f 4 oil sump recess of the cylindrical portion 1b annular core metal of the annular core metal Reference Signs List 3 spring ring 4 backup ring 4a recess 10 housing 20 rod
Claims (3)
る弾性材製の延出部を被着してなる密封装置であって、 延出部の自由端側内周に径方向中心へ向けて先鋭となる
Ｖ字リップが設けられ、このＶ字リップにおける延出部
付け根側の円錐面に４つ以上の輪状突起が軸方向所要間
隔おきに設けられ、 各輪状突起の軸方向幅がＶ字リップの頂点から遠いもの
ほど大きく設定されている、ことを特徴とする密封装
置。1. A sealing device comprising an inner peripheral side of an annular core metal and an extending portion made of an elastic material extending in one direction in the axial direction, the inner peripheral side of the annular core being covered with a diameter at an inner periphery of a free end of the extending portion. A V-shaped lip that is sharpened toward the center of the direction is provided, and four or more ring-shaped protrusions are provided at required intervals in the axial direction on a conical surface of the V-shaped lip near the base of the extending portion. A sealing device, wherein the direction width is set larger as the distance from the top of the V-shaped lip increases.
輪状突起の突出高さが互いにほぼ等しく設定されてい
る、ことを特徴とする密封装置。2. The sealing device according to claim 1, wherein the protruding heights of the respective annular protrusions are set to be substantially equal to each other.
いて、各輪状突起の断面形状が部分円弧状とされ、その
半径寸法が可変されて輪状突起の軸方向幅が管理されて
いる、ことを特徴とする密封装置。3. The sealing device according to claim 1, wherein a cross-sectional shape of each of the annular projections is a partial arc, and a radial dimension of the annular projection is variable to control an axial width of the annular projection. A sealing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30523197A JP3821931B2 (en) | 1997-11-07 | 1997-11-07 | Sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30523197A JP3821931B2 (en) | 1997-11-07 | 1997-11-07 | Sealing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11141689A true JPH11141689A (en) | 1999-05-25 |
| JP3821931B2 JP3821931B2 (en) | 2006-09-13 |
Family
ID=17942617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30523197A Expired - Lifetime JP3821931B2 (en) | 1997-11-07 | 1997-11-07 | Sealing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3821931B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002139156A (en) * | 2000-11-02 | 2002-05-17 | Nok Corp | Rotary body oil seal |
| JP2006322528A (en) * | 2005-05-18 | 2006-11-30 | Koyo Sealing Techno Co Ltd | Sealing device |
-
1997
- 1997-11-07 JP JP30523197A patent/JP3821931B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002139156A (en) * | 2000-11-02 | 2002-05-17 | Nok Corp | Rotary body oil seal |
| JP2006322528A (en) * | 2005-05-18 | 2006-11-30 | Koyo Sealing Techno Co Ltd | Sealing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3821931B2 (en) | 2006-09-13 |
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