JP2012092976A - Rotating shaft seal - Google Patents

Rotating shaft seal Download PDF

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JP2012092976A
JP2012092976A JP2011277945A JP2011277945A JP2012092976A JP 2012092976 A JP2012092976 A JP 2012092976A JP 2011277945 A JP2011277945 A JP 2011277945A JP 2011277945 A JP2011277945 A JP 2011277945A JP 2012092976 A JP2012092976 A JP 2012092976A
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dimension
groove
seal
rotary shaft
thin resin
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Kazufumi Unoda
和史 卯ノ田
Atsushi Hosokawa
敦 細川
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Mitsubishi Cable Industries Ltd
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Mitsubishi Cable Industries Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a rotating shaft seal which can be sufficiently applied to a pneumatic pressure use under severe conditions and can be easily attached to a seal attaching recessed groove in a right attitude, and to provide a rotating shaft seal whose frictional resistance to a rotary shaft is small, and which generates small heat, and has a long service life and excellent sealing performance.SOLUTION: The rotating shaft seal to which a thin wall resin section 20 is integrally adhered along the straight-like inner surface including an outer diameter-justified double-protruded lip 11 corresponding to a groove bottom double-corner 5 in a seal attaching recessed groove 3, an inner diameter-justified double-inner diameter lip 15, a cross sectional rubber section 10 where a straight-like inner surface parallel to the center of the shaft is defined by embedding an almost X-shaped cross sectional inner surface, a cross sectional single character-shaped thin wall resin section 20 having a plurality of small recessed grooves 22 circularly where grease is stored in a sliding surface 21 sliding-contacting with a rotary shaft where the small recessed groove 22 is formed in a depth dimension D22 shorter than the wall dimension in the thin wall resin section 20.

Description

本発明は、回転軸シールに係り、特に空気圧に好適であって、しかも両圧が負荷される回転軸シールに関する。   The present invention relates to a rotary shaft seal, and more particularly to a rotary shaft seal that is suitable for air pressure and is loaded with both pressures.

従来から、回転軸シールとしては、Ｏリング、キャップＯリング、キャップシール等が広く使用されている。
Ｏリングはスクイーズパッキンであり、つぶし反力が大きいため摩擦抵抗が大きく、それに伴って発熱が大きく、油圧用途等のように常に潤滑油膜が形成され、かつ、流体（油）による放熱作用が期待可能な場合は適用できるが、空気圧用途では、潤滑の枯渇による早期摩耗や、発熱による硬化・劣化が発生するという問題があった。
キャップＯリングは、極めて肉薄のＣ字状キャップをＯリングの浅い凹部に嵌込んで横断面円形の一般のＯリングと同じ外面形状としたものであり、また、キャップシールは、横断面受皿状等としたキャップと弾性シール本体とを組み合わせたものであり、いずれも、回転軸外周面（摺動面）側に樹脂を使用している構造であり（例えば、特許文献１参照）、上記Ｏリングよりも低摩擦となる利点がある。 Conventionally, O-rings, cap O-rings, cap seals and the like have been widely used as rotary shaft seals.
The O-ring is a squeeze packing, and since the crushing reaction force is large, the frictional resistance is large, and as a result, the heat generation is large, a lubricating oil film is always formed as in hydraulic applications, etc., and the heat dissipation action by fluid (oil) is expected. Although it can be applied when possible, in pneumatic applications, there are problems of early wear due to depletion of lubrication and hardening / deterioration due to heat generation.
The cap O-ring has an extremely thin C-shaped cap fitted into a shallow recess of the O-ring to have the same outer shape as a general O-ring having a circular cross section. The cap and the elastic seal body are combined, and both have a structure in which resin is used on the outer peripheral surface (sliding surface) of the rotating shaft (see, for example, Patent Document 1). There is an advantage of lower friction than the ring.

実開平６−８００５８号公報Japanese Utility Model Publication No. 6-80058

しかしながら、キャップＯリングは、Ｏリング同様にスクイーズタイプであるので、空気圧用途での潤滑の枯渇による早期摩耗が発生し易いという問題があり、他方、キャップシールは、ゴム部品と樹脂部品とを組み合わせて、シール用凹溝に組込む作業が難しい場合があり、組込み性に劣る問題がある。また、特に早期摩耗に関しては、空気圧が高く、かつ、高周速の使用条件下において、一層顕著にあらわれる。   However, since the cap O-ring is a squeeze type like the O-ring, there is a problem that premature wear is likely to occur due to depletion of lubrication in pneumatic applications. On the other hand, the cap seal is a combination of rubber parts and resin parts. As a result, it may be difficult to work in the groove for sealing, and there is a problem that the workability is poor. In particular, premature wear is more prominent under conditions of high air pressure and high peripheral speed.

そこで、本発明は、使用条件が過酷な空気圧用途にも十分に適用でき、かつ、シール装着用凹溝への容易に正しい姿勢で装着しやすい（組込み性に優れた）回転軸シールの提供を目的とする。また、回転軸に対する摩擦抵抗が小さく、発熱も少なく、寿命が長く、シール性能に優れた回転軸シールの提供をさらなる目的とする。   Accordingly, the present invention provides a rotary shaft seal that can be sufficiently applied to pneumatic applications with severe usage conditions and can be easily mounted in a correct mounting groove in a correct posture (excellent in integration). Objective. Another object of the present invention is to provide a rotary shaft seal that has a low frictional resistance against the rotary shaft, generates little heat, has a long service life, and has excellent sealing performance.

上記目的を達成するため、本発明に係る回転軸シールは、シール装着用凹溝の溝底両隅部に対応する外径寄りの両突隆リップ部と、内径寄りの両内径リップ部と、を有し、略Ｘ字状の横断面の内周面を埋め込んで軸心に平行なストレート状内周面とした横断面形状のゴム部と、回転軸に摺接する摺接面にグリスを貯えるための複数本の小凹溝を円環状に有する横断面一文字形状の薄肉樹脂部とを、備え、上記ストレート状内周面に沿って上記薄肉樹脂部を一体に接着した回転軸シールであって、上記小凹溝を、上記薄肉樹脂部の肉厚寸法よりも小さい深さ寸法に形成し、自由状態において、上記両突隆リップ部の軸心方向寸法を上記凹溝の溝幅よりも小さく設定し、かつ、上記両内径リップ部の軸心方向寸法及び上記薄肉樹脂部の幅寸法を相等しく設定して、上記両内径リップ部の軸心方向寸法及び上記薄肉樹脂部の幅寸法を上記両突隆リップ部の軸心方向寸法よりも小さく設定し、装着状態において、上記突隆リップが上記凹溝の側面に接触し、かつ、上記内径リップ部及び上記薄肉樹脂部と、上記側面と、の間に間隙が形成されるように構成したものである。   In order to achieve the above object, the rotary shaft seal according to the present invention includes both protruding lip portions near the outer diameter corresponding to the groove bottom both corners of the groove for mounting the seal, both inner lip portions near the inner diameter, Grease is stored in a rubber section having a cross-sectional shape that is embedded in the inner peripheral surface of a substantially X-shaped cross section and is parallel to the shaft center, and in a sliding contact surface that is in sliding contact with the rotating shaft. And a thin-walled resin portion having a single letter cross-sectional shape having an annular shape with a plurality of small concave grooves, and a rotary shaft seal in which the thin-walled resin portion is integrally bonded along the straight inner peripheral surface. The small concave groove is formed to a depth dimension smaller than the thickness dimension of the thin resin portion, and in the free state, the axial direction dimension of the both protruding lip portions is smaller than the groove width of the concave groove. Set the axial dimension of both inner lip parts and the width of the thin resin part. The axial dimension of the inner diameter lip part and the width dimension of the thin resin part are set smaller than the axial dimension of the two protruding lip parts. It is configured such that a gap is formed between the side surface of the concave groove and between the side surface of the inner diameter lip portion and the thin resin portion and the side surface.

上記ゴム部の軸心方向中央部のラジアル方向厚さ寸法と上記薄肉樹脂部の肉厚寸法との合計厚さ寸法が、上記凹溝の深さ寸法の70％〜95％に設定されているものである。   The total thickness dimension of the radial dimension of the central part in the axial direction of the rubber part and the thickness dimension of the thin resin part is set to 70% to 95% of the depth dimension of the concave groove. Is.

また、上記ゴム部は、ＮＢＲ，Ｈ−ＮＢＲ，ＦＫＭ，ＥＰＤＭの内の一つから選定され、さらに、上記薄肉樹脂部は、フッ素樹脂、ポリアセタール樹脂，ポリアミド，ポリカーボネート，ポリエチレンの内の一つから選定されているものである。   The rubber part is selected from one of NBR, H-NBR, FKM, and EPDM, and the thin resin part is selected from one of fluororesin, polyacetal resin, polyamide, polycarbonate, and polyethylene. It has been selected.

本発明によれば、シール装着用凹溝として、Ｏリング用の一般溝（一体溝）を流用可能であり、しかも、容易かつ確実に、そのような凹溝に対して、装着でき、組込み性に優れている。横断面を対称形状とすることが可能であり、両圧が負荷される箇所へも適用できる。さらに、シール装着状態下で弾性圧縮されるゴム部は、つぶし反力（圧縮に伴う弾性的反発力）が（Ｏリングに比して、）小さく、低摩擦力が得られる。しかも、薄肉樹脂部が直接に回転軸に接触するので、一層、低摩擦となり、発熱を防止できる。複数本の小凹溝には、油やグリース等が溜まって、さらに潤滑性を向上可能である。   According to the present invention, a general groove for O-ring (integrated groove) can be used as the groove for mounting the seal, and it can be easily and surely mounted on such a groove and can be assembled. Is excellent. It is possible to make the cross section symmetrical, and it can also be applied to locations where both pressures are applied. Furthermore, the rubber part that is elastically compressed under the seal mounting state has a small crushing reaction force (elastic repulsion force accompanying compression) (compared to the O-ring), and a low frictional force can be obtained. In addition, since the thin resin portion directly contacts the rotating shaft, the friction is further reduced and heat generation can be prevented. Oil or grease accumulates in the plurality of small concave grooves, and the lubricity can be further improved.

また、ゴム部は、突隆リップ部を有するので、Ｕパッキンの如く自封作用をなし、受圧時に軸心方向高圧側の接触面圧のピーク値も高く、シール性も向上する。また、完全なスクイーズタイプでないので、未加圧時には低摩擦である。特に、シール装着用凹溝内において、常に姿勢が安定して保持でき、Ｏリングなどのように溝内で転動して摩耗粉が発生することがないため、自己の摩耗粉により摩耗を助長されることがない。   Further, since the rubber part has a protruding lip part, it has a self-sealing action like a U-packing, has a high peak value of the contact surface pressure on the high axial direction side during pressure reception, and improves the sealing performance. Moreover, since it is not a perfect squeeze type, it has low friction when not pressurized. In particular, it is possible to maintain a stable posture at all times in the groove for mounting the seal, and it does not generate wear powder due to rolling in the groove like an O-ring. It will not be done.

以上のように、本発明は、耐摩耗性に優れ、組込み性が良好で、寿命が長いという利点を備え、空気圧用途にも好適である。   As described above, the present invention has the advantages of excellent wear resistance, good integration, and long life, and is also suitable for pneumatic applications.

本発明の第１の実施の形態を示す要部断面図である。It is principal part sectional drawing which shows the 1st Embodiment of this invention. 第２の実施の形態を示す要部断面斜視図である。It is a principal part cross-sectional perspective view which shows 2nd Embodiment. 第３の実施の形態を示す要部断面斜視図である。It is a principal part cross-sectional perspective view which shows 3rd Embodiment. 各部寸法関係説明図である。It is each part dimension related explanatory drawing. 装着状態の一例を示す要部断面図である。It is principal part sectional drawing which shows an example of a mounting state. 第４の実施の形態を示す要部横断面図である。It is a principal part cross-sectional view which shows 4th Embodiment. 第５の実施の形態を示す要部横断面図である。It is a principal part cross-sectional view which shows 5th Embodiment.

以下、実施の形態を示す図面に基づいて本発明を詳説する。
図５は、本発明に係る回転軸シールＳの装着状態を示し、図１はその自由状態（未装着状態）を示す。１は、矢印Ａのように軸心Ｌ１廻りに回転する回転軸であって（図５参照）、この回転軸１の外周面１ａに摺接しつつ密封作用をなすように回転軸シールＳが、ハウジング２の孔部の内周面２ａに形成された（一体溝型の）シール装着用凹溝３に組込まれ（装着され）ている。 Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
FIG. 5 shows the mounted state of the rotary shaft seal S according to the present invention, and FIG. 1 shows its free state (unmounted state). 1, the axis L 1 a rotating shaft which rotates around (see FIG. 5), the rotation shaft seal S to form a sealing action sliding contact with the outer peripheral surface 1a of the rotary shaft 1 as shown by the arrow A The housing 2 is assembled (attached) into a seal mounting concave groove 3 (integrated groove type) formed on the inner peripheral surface 2a of the hole portion of the housing 2.

本発明のシールＳは、図１〜図７に於て、ゴム部10と、上記回転軸１に摺接する薄肉樹脂部20とを、一体に接着した構成である。
ゴム部10は、（図４と図５に示すように、）シール装着用凹溝３の溝底４の両隅部５，５に対応するように、突隆リップ部11，11を有する。また、上記薄肉樹脂部20は、回転軸１に摺接する摺接面21に複数本の小凹溝22を円環状かつ平行状に有している。 1 to 7, the seal S of the present invention has a structure in which a rubber portion 10 and a thin resin portion 20 that is in sliding contact with the rotating shaft 1 are integrally bonded.
The rubber part 10 has protruding lip parts 11 and 11 so as to correspond to both corner parts 5 and 5 of the groove bottom 4 of the groove for mounting seal 3 (as shown in FIGS. 4 and 5). Further, the thin resin portion 20 has a plurality of small concave grooves 22 in an annular and parallel shape on a sliding contact surface 21 that is in sliding contact with the rotating shaft 1.

具体的には、樹脂部20の小凹溝22の本数は、使用条件・用途等に応じて増減可能であり、図１〜図５では４本を示し、図６では２本、図７では６本を示す。   Specifically, the number of the small concave grooves 22 of the resin portion 20 can be increased or decreased according to the use conditions / uses, etc., 4 is shown in FIGS. 1 to 5, 2 is shown in FIG. 6 are shown.

そして、図１〜図７の各実施の形態に於て、ゴム部10の横断面形状について説明すれば、その内周面12は、軸心Ｌ１に平行なストレート状に形成され、また、シール装着用凹溝３の溝底隅部５，５に対応するように突出状に形成された突隆リップ部11，11によって、外周面側には浅い凹周溝13が形成されると共に、軸心方向両側面には、受圧用凹溝14，14が形成されている。従って、軸心方向側面には、いわばＵパッキンのように、外径寄りの突隆リップ部11と、内径寄りのリップ部15とを有し、受圧用凹溝14は半円弧状の横断面形状である。 Then, in each embodiment of FIGS. 1 to 7, the cross-sectional shape of the rubber part 10 will be described. The inner peripheral surface 12 is formed in a straight shape parallel to the axis L 1 , and A shallow concave circumferential groove 13 is formed on the outer peripheral surface side by the protruding lip portions 11, 11 formed so as to correspond to the groove bottom corners 5, 5 of the concave groove 3 for mounting the seal, Pressure receiving grooves 14 and 14 are formed on both side surfaces in the axial direction. Therefore, the side surface in the axial direction has a protruding lip portion 11 closer to the outer diameter and a lip portion 15 closer to the inner diameter, like a so-called U-packing, and the pressure receiving groove 14 has a semicircular cross section. Shape.

自由状態に於て、両内径リップ部15, 15の軸心方向寸法Ｗ15よりも、外径側の両突隆リップ部11，11の軸心方向寸法Ｗ11の方が大きく設定され、Ｗ11＞Ｗ15とする。そして、1.0mm≦（Ｗ11−Ｗ15）≦ 2.0mmのように設定して、回転軸１の外周面１ａと、ハウジング２の内周面２ａの間の間隙31への受圧時の食い込みを防止している。
なお、樹脂部20の幅寸法は、上記両内径リップ部15、15の軸心方向寸法Ｗ15に相等しい。また、図４に２点鎖線で示した凹溝３の溝幅Ｗ３と比較して、上記寸法Ｗ11は、次の関係にある。即ち、Ｗ３＞Ｗ11，かつ、 0.3mm≦（Ｗ３−Ｗ１1）≦ 1.0mmとする。 At a free state, the axial center direction dimension W 15 of both inner diameter lip 15, 15, towards the axial dimension W 11 of both突隆lip portions 11 of the outer diameter side is set larger, W 11> W and 15. Then, 1.0 mm ≦ (W 11 −W 15 ) ≦ 2.0 mm is set, and the biting at the time of pressure reception in the gap 31 between the outer peripheral surface 1a of the rotary shaft 1 and the inner peripheral surface 2a of the housing 2 is set. It is preventing.
The width dimension of the resin portion 20 is equal to the axial dimension W 15 of the inner diameter lip portions 15 and 15 . Compared with the groove width W 3 of the concave groove 3 indicated by a two-dot chain line in FIG. 4, the dimension W 11 has the following relationship. That is, W 3 > W 11 and 0.3 mm ≦ (W 3 −W 11 ) ≦ 1.0 mm.

次に、樹脂部20を薄肉と呼ぶのは、その肉厚寸法Ｔ20が、 0.2mm〜0.8mmと十分に小さいためである。そして、この薄肉樹脂部20の横断面形状は、図１〜図７では、横断面一文字形状とする。小凹溝22の深さ寸法Ｄ22は、薄肉樹脂部20の肉厚寸法Ｔ20よりも小さく設定する。好ましくは、0.20×Ｔ20≦Ｄ22≦0.70×Ｔ20のように設定する。下限値未満であると小凹溝22を設けた理由（油やグリースを貯えるという作用）が不十分となる。逆に上限値を越すと、強度が不足して、樹脂部20が破損する恐れが生ずる。
図１〜図７では、ゴム部10はいわゆるＸシールの略Ｘ字状の横断面の内周面を埋め込んで、ストレート状内周面12とした横断面形状であるといえる。いわば、軸の太いきの子型であるということもできる。 Next, the resin portion 20 is referred to as a thin-walled, its wall thickness T 20 is because sufficiently and 0.2mm~0.8mm small. And the cross-sectional shape of this thin resin part 20 is taken as the character shape of a cross section in FIGS. Depth D 22 of the small recess groove 22 is set smaller than the thickness dimension T 20 of the thin resin portion 20. Preferably, it is set as 0.20 × T 20 ≦ D 22 ≦ 0.70 × T 20 . If it is less than the lower limit, the reason for providing the small concave groove 22 (the action of storing oil or grease) becomes insufficient. Conversely, when the upper limit is exceeded, the strength is insufficient and the resin part 20 may be damaged.
1 to 7, it can be said that the rubber portion 10 has a cross-sectional shape in which an inner peripheral surface of a substantially X-shaped cross section of a so-called X seal is embedded to form a straight inner peripheral surface 12. In other words, it can be said that it is a child of a thick axis.

ところで、図１〜図７のいずれの実施の形態においても、ゴム部10は、ＮＢＲ，Ｈ−ＮＢＲ，ＦＫＭ，ＥＰＤＭ等から成る。また、樹脂部20は、ＰＴＦＥ等のフッ素樹脂、ポリアセタール樹脂，ポリアミド，ポリカーボネート，ポリエチレン等から成る。   Incidentally, in any of the embodiments shown in FIGS. 1 to 7, the rubber portion 10 is made of NBR, H-NBR, FKM, EPDM, or the like. The resin portion 20 is made of a fluororesin such as PTFE, a polyacetal resin, polyamide, polycarbonate, polyethylene or the like.

そして、本発明のいずれの実施の形態にあっても、ゴム部10と薄肉樹脂部20とは一体に接着されているが、この接着の方法としては、加硫接着等を挙げることができる。つまり、樹脂部20を、切削等の機械加工によって製作し、次に、加硫成形用金型内に、この樹脂部20及び未加硫ゴムとを設置し、加熱加圧して、未加硫ゴムを加硫してゴム部10を形成すると同時に樹脂部20と一体に接着させる。あるいは、ゴムと樹脂材料を接着できる接着剤を用いて相互に接着して一体化するも好ましい。また、ゴム部10と樹脂部20との一体接着強度を向上させるために、前もって樹脂部20の接着面を粗くして微小な凹凸を設けてもよい。
また、既述したように浅い凹周溝13を外周面に有するゴム部10と、薄肉樹脂部20を合わせた軸心方向中央部のラジアル方向厚さ寸法Ｔ０が、シール装着用凹溝３の深さ寸法Ｔ４の70％〜95％に設定するのが望ましい（図１〜図７参照）。つまり、0.70×Ｔ４≦Ｔ０≦0.95×Ｔ４のように設定する。このようにすれば、つぶし反力が比較的小さく、自封効果の得やすいリップタイプの特性をシールに付与可能である。 In any embodiment of the present invention, the rubber part 10 and the thin-walled resin part 20 are bonded together, and examples of the bonding method include vulcanization bonding. That is, the resin part 20 is manufactured by machining such as cutting, and then the resin part 20 and the unvulcanized rubber are placed in a vulcanization mold, heated and pressurized, and unvulcanized. Rubber is vulcanized to form the rubber part 10 and simultaneously bonded to the resin part 20. Alternatively, it is also preferable that the rubber and the resin material are bonded and integrated by using an adhesive capable of bonding the rubber and the resin material. In addition, in order to improve the integrated adhesive strength between the rubber part 10 and the resin part 20, the adhesive surface of the resin part 20 may be roughened in advance to provide minute irregularities.
Further, the rubber portion 10 having a shallow concave peripheral groove 13 as described above on the outer peripheral surface, radial thickness T 0 of the axial direction center portion of the combined thin resin portion 20, the seal mounting groove 3 desirably set to 70% to 95% of the depth T 4 (see FIGS. 1 to 7). That is, 0.70 × T 4 ≦ T 0 ≦ 0.95 × T 4 is set. In this way, it is possible to give the seal a lip-type characteristic that has a relatively small crushing reaction force and that can easily provide a self-sealing effect.

ところで、図２に示した実施の形態にあっては、小切欠部（ノッチ）17を複数個等配し、図５に示したシール装着用凹溝３の側面６への張付きを防止している。あるいは、図３に示した実施の形態にあっては、受圧用凹溝14内に、凹溝14を横切る方向（軸心Ｌ１方向から見てラジアル方向）に、リッジ（小仕切壁）18を等配し、このリッジ18は突隆リップ部11の側面よりも僅かに突出状として、装着状態で、シール装着用凹溝３の側面６に複数個のリッジ18が当接して、シールＳの張付きを防止し、シールＳの姿勢を安定させ得る。また、図４に於て、Ｗ11＞Ｗ15として、各リップ部15と側面６との間に、 0.5mm以上の間隙23を形成し、シール受圧状態下で、シールＳが巻き込まれることを、防止するのが良い。 By the way, in the embodiment shown in FIG. 2, a plurality of small notches (notches) 17 are equally arranged to prevent the seal mounting concave groove 3 shown in FIG. ing. Alternatively, in the embodiment shown in FIG. 3, the pressure receiving recess groove 14, in a direction crossing the groove 14 (radial direction when viewed from the axis L 1 direction), the ridge (small partition wall) 18 The ridges 18 are slightly protruded from the side surface of the protruding lip portion 11, and in the mounted state, a plurality of ridges 18 abut against the side surface 6 of the seal mounting groove 3, and the seal S Can be prevented and the posture of the seal S can be stabilized. In FIG. 4, it is assumed that a gap 23 of 0.5 mm or more is formed between each lip portion 15 and the side surface 6 so that W 11 > W 15 , and the seal S is caught under the seal pressure receiving state. Good to prevent.

本発明は上述のように構成され、特に、空気圧用途として、小凹溝22内に潤滑油等が保持されて、樹脂部20の低摩擦係数と共に、摩擦抵抗が小さく、発熱が減少して、長寿命化が達成できる。また、樹脂部20は 0.8mm以下の肉厚寸法Ｔ20であり、弾性変形容易なため、一体溝の凹溝３へ、本発明に係るシールＳを組込みしやすい（組込み性に優れる）。従って、従来の一般的なＯリング用の凹溝３へ、本発明のシールＳを装着可能である。 The present invention is configured as described above, and in particular, as a pneumatic application, lubricating oil or the like is held in the small concave groove 22, along with the low friction coefficient of the resin portion 20, the frictional resistance is small, the heat generation is reduced, Long life can be achieved. The resin portion 20 is less thickness dimension T 20 0.8 mm, the elastic deformation easy (excellent integrative) integral groove to groove 3, it is easy to incorporate a seal S of the present invention. Therefore, the seal S of the present invention can be mounted on the conventional general O-ring groove 3.

本発明は以上述べたように、シール装着用凹溝３の溝底両隅部５，５に対応する突隆リップ部11，11を有するゴム部10と、回転軸１に摺接する摺接面21に複数本の小凹溝22を円環状に有する薄肉樹脂部20とを、一体に接着した構成であるので、凹溝３への組込み性が良好であり、Ｏリング用凹溝等の一般的な一体溝にも、そのまま、組込み（装着）できる。また、装着状態で、つぶし反力が比較的小さく、自封効果も得やすい断面形状であり、良好なシール性能を発揮する。複数本の小凹溝22は油等が保持され易く、低摩擦となり、空気圧用途にも好適であり、長寿命である。   In the present invention, as described above, the rubber portion 10 having the protruding lip portions 11 and 11 corresponding to the groove bottom corner portions 5 and 5 of the seal mounting concave groove 3 and the sliding contact surface slidably contacting the rotary shaft 1. Since the thin resin portion 20 having a plurality of small concave grooves 22 in an annular shape is integrally bonded to 21, it is easy to incorporate into the concave grooves 3 and is generally used as an O-ring concave groove or the like. It can be installed (attached) as it is in an integrated groove. Moreover, it has a cross-sectional shape in which the crushing reaction force is relatively small and a self-sealing effect can be easily obtained in the mounted state, and exhibits good sealing performance. The plurality of small concave grooves 22 are easy to retain oil or the like, have low friction, are suitable for pneumatic applications, and have a long life.

また、上記ゴム部10の横断面形状においてその内周面12を軸心Ｌ１に平行なストレート状に形成し、かつ、上記薄肉樹脂部20の横断面形状を一文字形状として、該薄肉樹脂部20の肉厚寸法Ｔ20よりも小さい深さ寸法Ｄ22に上記小凹溝22を形成したので、薄肉樹脂部20がシンプルな形状となり、機械加工等にて製作が容易でありながら、潤滑油等を保持する小凹溝22を形成できて、シール性と耐久性に優れる。また、シール装着用凹溝３への装着（組込み）も容易である。 Further, in the cross-sectional shape of the rubber part 10, the inner peripheral surface 12 is formed in a straight shape parallel to the axis L 1 , and the cross-sectional shape of the thin-walled resin part 20 is a single-character shape, and the thin-walled resin part Since the small concave groove 22 is formed in the depth dimension D 22 smaller than the wall thickness dimension T 20 , the thin resin portion 20 has a simple shape and is easy to manufacture by machining or the like. It is possible to form a small concave groove 22 that holds, etc., and is excellent in sealing performance and durability. Moreover, mounting (incorporating) into the groove 3 for mounting the seal is easy.

また、上記ゴム部10は、ＮＢＲ，Ｈ−ＮＢＲ，ＦＫＭ，ＥＰＤＭ等のゴム材料から成り、さらに、上記樹脂部20は、フッ素樹脂、ポリアセタール樹脂，ポリアミド，ポリカーボネート，ポリエチレン等の樹脂材料から成り、ゴム部10は弾性特性と耐久性等から好適なものを、また、樹脂部20は低摩擦係数と加工性と接着特性等から好適なものを、各々選定可能となり、密封流体に対応できる。
また、上記ゴム部10の軸心方向中央部のラジアル方向厚さ寸法Ｔ10と上記薄肉樹脂部20の肉厚寸法Ｔ20との合計厚さ寸法Ｔ０が、シール装着用凹溝３の深さ寸法Ｔ４の70％〜95％に設定されているので、未加圧状態下では低摩擦となり好ましく、かつ、つぶし反力も小さく、自封効果が得やすい。 The rubber part 10 is made of a rubber material such as NBR, H-NBR, FKM, EPDM, and the resin part 20 is made of a resin material such as fluororesin, polyacetal resin, polyamide, polycarbonate, polyethylene, The rubber part 10 can be selected from a material suitable for elasticity and durability, and the resin part 20 can be selected from a material suitable for a low friction coefficient, workability, adhesive properties, etc., and can be used for a sealed fluid.
Further, the total thickness T 0 of the radial thickness T 10 at the center in the axial direction of the rubber portion 10 and the thickness T 20 of the thin resin portion 20 is the depth of the groove 3 for mounting the seal. because it is set to 70% to 95% of the dimension T 4, preferably be low friction under non-pressurized state, and crushing reaction force is small, self-sealing effect is easy to obtain.

１ 回転軸
３ シール装着用凹溝
５ 隅部
６ 側面
10 ゴム部
11 突隆リップ部
12 内周面
15 両内径リップ
20 薄肉樹脂部
21 摺接面
22 小凹溝
23 間隙
Ｄ22 深さ寸法
Ｌ１ 軸心
Ｔ０ 合計厚さ寸法
Ｔ４ 深さ寸法
Ｔ10 ラジアル方向厚さ寸法
Ｔ20 肉厚寸法
Ｗ３ 溝幅
Ｗ11 軸心方向寸法
Ｗ15 軸心方向寸法 1 Rotating shaft 3 Groove for mounting seal 5 Corner 6 Side
10 Rubber part
11 Ridge lip
12 Inner surface
15 Inner lip
20 Thin resin part
21 Sliding surface
22 Small groove
23 Gap D 22 Depth dimension L 1 Shaft center T 0 Total thickness dimension T 4 Depth dimension T 10 Radial direction thickness dimension T 20 Thickness dimension
W 3 groove width
W 11 axial direction dimension W 15 axial direction dimension

Claims (3)

シール装着用凹溝（３）の溝底両隅部（５）（５）に対応する外径寄りの両突隆リップ部（11）（11）と、内径寄りの両内径リップ部（15）（15）と、を有し、略Ｘ字状の横断面の内周面を埋め込んで軸心（Ｌ１）に平行なストレート状内周面（12）とした横断面形状のゴム部（10）と、
回転軸（１）に摺接する摺接面（21）にグリスを貯えるための複数本の小凹溝（22）を円環状に有する横断面一文字形状の薄肉樹脂部（20）とを、備え、
上記ストレート状内周面（12）に沿って上記薄肉樹脂部（20）を一体に接着した回転軸シールであって、
上記小凹溝（22）を、上記薄肉樹脂部（20）の肉厚寸法（Ｔ20）よりも小さい深さ寸法（Ｄ22）に形成し、
自由状態において、上記両突隆リップ部（11）（11）の軸心方向寸法（Ｗ11）を上記凹溝（３）の溝幅（Ｗ３）よりも小さく設定し、かつ、上記両内径リップ部（15）（15）の軸心方向寸法（Ｗ15）及び上記薄肉樹脂部（20）の幅寸法を相等しく設定して、上記両内径リップ部（15）（15）の軸心方向寸法（Ｗ15）及び上記薄肉樹脂部（20）の幅寸法を上記両突隆リップ部（11）（11）の軸心方向寸法（Ｗ11）よりも小さく設定し、
装着状態において、上記突隆リップ（11）が上記凹溝（３）の側面（６）に接触し、かつ、上記内径リップ部（15）及び上記薄肉樹脂部（20）と、上記側面（６）と、の間に間隙（23）が形成されるように構成したことを特徴とする回転軸シール。 Both protruding lip portions (11) (11) near the outer diameter corresponding to the groove bottom corners (5) (5) of the groove for mounting the seal (3), and both inner diameter lip portions (15) near the inner diameter (15), and a rubber portion (10 having a cross-sectional shape having a straight inner peripheral surface (12) parallel to the axis (L 1 ) by embedding the inner peripheral surface of the substantially X-shaped cross-section. )When,
A thin resin portion (20) having a single cross-sectional shape with an annular shape having a plurality of small concave grooves (22) for storing grease on a sliding contact surface (21) that is in sliding contact with the rotating shaft (1),
A rotary shaft seal in which the thin resin portion (20) is integrally bonded along the straight inner peripheral surface (12),
The small groove (22) is formed to a depth dimension (D 22 ) smaller than the thickness dimension (T 20 ) of the thin resin portion (20);
In the free state, the axial dimension (W 11 ) of the both protruding lip portions (11) and (11) is set smaller than the groove width (W 3 ) of the concave groove (3), and both the inner diameters are set. Set the axial dimension (W 15 ) of the lip part (15) (15) and the width dimension of the thin resin part (20) to be the same, and the axial direction of the inner lip part (15) (15). The dimension (W 15 ) and the width dimension of the thin resin part (20) are set smaller than the axial dimension (W 11 ) of the two protruding lip parts (11) and (11),
In the mounted state, the protruding lip (11) is in contact with the side surface (6) of the concave groove (3), and the inner lip portion (15), the thin resin portion (20), and the side surface (6). ), And a gap (23) is formed between the rotary shaft seals. 上記ゴム部（10）の軸心方向中央部のラジアル方向厚さ寸法（Ｔ10）と上記薄肉樹脂部（20）の肉厚寸法（Ｔ20）との合計厚さ寸法（Ｔ0）が、上記凹溝（３）の深さ寸法（Ｔ4）の70％〜95％に設定されている請求項１記載の回転軸シール。 The total thickness dimension (T 0 ) of the radial thickness dimension (T 10 ) at the axial center of the rubber part (10) and the thickness dimension (T 20 ) of the thin resin part (20) is: The rotary shaft seal according to claim 1, wherein the rotary shaft seal is set to 70% to 95% of the depth dimension (T 4 ) of the concave groove (3). 上記ゴム部（10）は、ＮＢＲ，Ｈ−ＮＢＲ，ＦＫＭ，ＥＰＤＭの内の一つから選定され、さらに、上記薄肉樹脂部（20）は、フッ素樹脂、ポリアセタール樹脂，ポリアミド，ポリカーボネート，ポリエチレンの内の一つから選定される請求項１又は２記載の回転軸シール。   The rubber part (10) is selected from one of NBR, H-NBR, FKM, and EPDM, and the thin resin part (20) is made of fluorine resin, polyacetal resin, polyamide, polycarbonate, or polyethylene. The rotary shaft seal according to claim 1 or 2, selected from one of the following.
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