JP5689099B2 - Seal washer - Google Patents

Seal washer Download PDF

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JP5689099B2
JP5689099B2 JP2012194148A JP2012194148A JP5689099B2 JP 5689099 B2 JP5689099 B2 JP 5689099B2 JP 2012194148 A JP2012194148 A JP 2012194148A JP 2012194148 A JP2012194148 A JP 2012194148A JP 5689099 B2 JP5689099 B2 JP 5689099B2
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inner peripheral
peripheral edge
seal washer
holes
thin inner
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JP2014047901A (en
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卯ノ田　和史
和史 卯ノ田
吉夫 東
吉夫 東
尚彦 本井傳
尚彦 本井傳
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Mitsubishi Cable Industries Ltd
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Description

本発明は、シールワッシャに関する。   The present invention relates to a seal washer.

従来、ボルトやナット又はリベット等の締付部材と、相手部材の着座面との間に装着されて、液体又は気体の漏洩を防ぐシールワッシャが知られている（特許文献１参照）。   Conventionally, a seal washer that is mounted between a fastening member such as a bolt, a nut, or a rivet and a seating surface of a mating member to prevent leakage of liquid or gas is known (see Patent Document 1).

実開昭６１−１３１５１２号公報Japanese Utility Model Publication No. 61-131512

図１０と図１１に示すように、従来のシールワッシャは、金属製リテーナ４２の内周端縁の複数箇所に、貫通状のブリッジ穴４３が設けられ、インサート成形にて、このブリッジ穴４３を充填するように未加硫ゴム材料を流し込んで加圧加熱して加硫し、ゴム製のシールリップ４１が一体成形されている。シールリップ４１は、ブリッジ穴４３を充填して、表裏を連結する複数のブリッジ部４５が形成されている。   As shown in FIGS. 10 and 11, the conventional seal washer is provided with penetrating bridge holes 43 at a plurality of locations on the inner peripheral edge of the metal retainer 42, and the bridge holes 43 are formed by insert molding. An unvulcanized rubber material is poured so as to be filled, and the rubber seal lip 41 is integrally formed by pressurizing and heating to vulcanize. The seal lip 41 is formed with a plurality of bridge portions 45 that fill the bridge holes 43 and connect the front and back sides.

しかし、従来のシールワッシャは、高いトルクで締付けられた際、ナット等との摩擦により生じる周方向の力に対してのブリッジ部４５の強度が弱く、シールリップ４１が損傷を受け易いという欠点があった。しかも、締付けによる軸心方向の圧縮力にてシールリップ４１が大きなつぶし代をもって弾性変形した際、ブリッジ穴４３の隙間４４からシールリップ４１が剥離を生じる虞れがあった。シールリップ４１が剥離してしまうと、シール機能が失われ、密封状態を保てなくなる。
また、リテーナ４２とシールリップ４１の境界線が、凹凸のある（ジグザグの）歯車状となっているため、成型時のバリ取りが難しく、美観を損ねるだけでなく、残ったバリが剥がれて脱落すると、シール性や環境に害を及ぼすという問題があった。 However, when the conventional seal washer is fastened with a high torque, the strength of the bridge portion 45 against the circumferential force generated by friction with a nut or the like is weak, and the seal lip 41 is easily damaged. there were. Moreover, when the seal lip 41 is elastically deformed with a large crushing margin by the compressive force in the axial direction due to tightening, the seal lip 41 may be peeled off from the gap 44 of the bridge hole 43. If the seal lip 41 is peeled off, the sealing function is lost and the sealed state cannot be maintained.
In addition, since the boundary line between the retainer 42 and the seal lip 41 has an uneven (zigzag) gear shape, it is difficult to deburr at the time of molding. Then, there existed a problem of having a harmful effect on sealing performance and the environment.

そこで、本発明は、周方向の力に対するブリッジ強度が強く、シール性能を確実に保持できるシールワッシャを提供することを目的とする。   In view of the above, an object of the present invention is to provide a seal washer that has a strong bridge strength with respect to a force in the circumferential direction and can reliably maintain the sealing performance.

本発明に係るシールワッシャは、円環状リテーナに薄肉内周縁部を設け、該薄肉内周縁部に複数個の貫通孔を形成し、インサート成形にて、該貫通孔を充填して表裏を連結したブリッジ部を形成すると共に上記薄肉内周縁部を抱込状として環状弾性リングを一体成形したシールワッシャに於て、上記薄肉内周縁部に形成された上記貫通孔を、円周方向細長状に形成して、所定ピッチで周方向に複数個を一列に並べて配設し、該貫通孔に充填された表裏連結状のブリッジ部が円周方向細長形状に形成され、平面視に於て、上記薄肉内周縁部の全面積に対し、上記複数個の貫通孔の総面積が２０％〜６０％に設定されているものである。 The seal washer according to the present invention has a thin inner peripheral edge provided in an annular retainer, a plurality of through holes are formed in the thin inner peripheral edge, and the through holes are filled by insert molding to connect the front and back sides. In the seal washer that integrally forms an annular elastic ring with the thin-walled inner peripheral edge as an embedding shape, the through-hole formed in the thin-walled inner peripheral edge is formed in a circumferentially elongated shape. to, side by side a plurality in a row and arranged at a predetermined pitch in the circumferential direction, the bridge portion of the front and back coupling like filled in the through hole is formed in the circumferential direction elongated, at a plan view, the thin The total area of the plurality of through holes is set to 20% to 60% with respect to the entire area of the inner peripheral edge .

また、上記円環状リテーナと上記環状弾性リングとの境界線が真円形状であるものである。 The boundary line between the annular retainer and the annular elastic ring is a perfect circle .

本発明のシールワッシャによれば、周方向の力に対してのブリッジ強度が増し、より高いトルクでの締付けが可能となり、かつ、繰り返しの締付けに再使用（およそ１０回以上）できる。貫通孔を細長状としたことで、加工時に使用する穴あけパンチの強度が増し、治工具の使用耐久性が向上する。弾性リングの剥離・脱落を防止でき、シール性能を確実に保持できる。   According to the seal washer of the present invention, the bridge strength against the force in the circumferential direction is increased, it is possible to perform tightening with a higher torque, and it can be reused for repeated tightening (approximately 10 times or more). By making the through-holes elongated, the strength of the drilling punch used at the time of processing is increased, and the durability of the tool is improved. The elastic ring can be prevented from peeling and dropping, and the sealing performance can be reliably maintained.

本発明の実施の一形態を示した斜視図である。It is the perspective view which showed one Embodiment of this invention. 図１のシールワッシャを示した平面図である。It is the top view which showed the seal washer of FIG. 図１のシールワッシャの横断面図である。It is a cross-sectional view of the seal washer of FIG. 本発明の他の実施形態を示した斜視図である。It is the perspective view which showed other embodiment of this invention. 図４のシールワッシャを示した平面図である。It is the top view which showed the seal washer of FIG. 図４のシールワッシャの横断面図である。It is a cross-sectional view of the seal washer of FIG. 本発明のシールワッシャの締付前使用状態を示した断面図である。It is sectional drawing which showed the use condition before fastening of the seal washer of this invention. 本発明のシールワッシャの締付使用状態を示した断面図である。It is sectional drawing which showed the fastening use state of the seal washer of this invention. 本発明の別の実施形態を示した平面図である。It is the top view which showed another embodiment of this invention. 従来のシールワッシャを示した斜視図である。It is the perspective view which showed the conventional seal washer. 従来のシールワッシャを示した平面図である。It is the top view which showed the conventional seal washer.

以下、実施の形態を示す図面に基づき本発明を詳説する。
図１〜図３に示すように、本発明のシールワッシャは、円環状リテーナ２に薄肉内周縁部２０を設け、薄肉内周縁部２０に複数個の貫通孔１３を形成し、インサート成形にて、貫通孔１３を充填して表裏を連結したブリッジ部３を形成すると共に薄肉内周縁部２０を抱込状として環状弾性リング１を一体成形している。薄肉内周縁部２０に形成された貫通孔１３を、円周方向細長状に形成して、所定ピッチで周方向に複数個を一列に並べて配設し、貫通孔１３に充填された表裏連結状のブリッジ部３が円周方向細長形状に形成されている。 Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
As shown in FIGS. 1 to 3, the seal washer according to the present invention is provided with a thin inner peripheral edge portion 20 in the annular retainer 2, and a plurality of through holes 13 are formed in the thin inner peripheral edge portion 20. The annular elastic ring 1 is integrally formed by filling the through-hole 13 to form the bridge portion 3 in which the front and back surfaces are connected and the thin inner peripheral edge portion 20 as the embedding shape. The through-holes 13 formed in the thin inner peripheral edge portion 20 are formed in an elongated shape in the circumferential direction, and a plurality of the through-holes 13 are arranged in a row in the circumferential direction at a predetermined pitch. The bridge portion 3 is formed in a circumferentially elongated shape.

弾性リング１は、ニトリルゴム、フッ素ゴム、エチレン・プロピレンゴム、あるいは、シリコンゴム、クロロプレンゴム等の各種ゴム、又は、軟質樹脂等の弾性部材から成り、硬さが５５ＩＲＨＤ〜８０ＩＲＨＤであるのが好ましい。弾性リング１は、その内周面に、内方突出状の小リップ８を有している。小リップ８は、断面二等辺三角形状であって、その頂点角度は、４０°〜８０°に設定されている。弾性リング１の内径は、ボルトの雄ネジ部やリベット等の軸部等を挿通するのに十分な大きさに設定されている。
円環状リテーナ２は、扁平な金属又は硬質樹脂から成り、その外径寸法Ｄは、１０ｍｍ〜４５ｍｍである。また、円環状リテーナ２は、厚さ寸法Ｔ２が１．０ｍｍ〜３．３ｍｍで、弾性リング１は、自由状態で、円環状リテーナ２の厚さ寸法Ｔ２よりも大きな肉厚寸法Ｔ１となるように設定されている。つまり、弾性リング１は、円環状リテーナ２より厚み方向に突出し、この厚み寸法の差（Ｔ１−Ｔ２）がつぶし代となって、弾性リング１が圧縮されて確実なシールが可能となる。 The elastic ring 1 is made of an elastic member such as nitrile rubber, fluorine rubber, ethylene / propylene rubber, various rubbers such as silicon rubber and chloroprene rubber, or soft resin, and preferably has a hardness of 55 IRHD to 80 IRHD. . The elastic ring 1 has a small lip 8 projecting inwardly on its inner peripheral surface. The small lip 8 has an isosceles triangular cross section, and its apex angle is set to 40 ° to 80 °. The inner diameter of the elastic ring 1 is set to a size sufficient to pass through a male screw portion of a bolt, a shaft portion such as a rivet, and the like.
The annular retainer 2 is made of a flat metal or a hard resin, and has an outer diameter D of 10 mm to 45 mm. Further, the annular retainer 2 has a thickness dimension T 2 of 1.0 mm to 3.3 mm, and the elastic ring 1 has a wall thickness dimension T 1 larger than the thickness dimension T 2 of the annular retainer 2 in a free state. It is set to become. That is, the elastic ring 1 protrudes in the thickness direction from the annular retainer 2, and the difference in thickness (T 1 −T 2 ) becomes a crushing margin, so that the elastic ring 1 is compressed and reliable sealing is possible. .

図２の平面図に示すように、本発明のシールワッシャは、円環状リテーナ２と環状弾性リング１との境界線ＢＬ１が真円形状である。
弾性リング１は、インサート成形の際に、薄肉内周縁部２０を包囲するように流し込まれた未加硫の生ゴム材料を加熱・加圧して、円環状リテーナ２の厚さ寸法Ｔ２を越えて突出する（厚み方向に食み出す）ように、肉厚寸法Ｔ１をもって圧盛り状に加硫成形されている。円環状リテーナ２は、円筒状段壁部２１によって弾性リング１の外周面を包囲し、この円筒状段壁部２１に沿って凹凸の無い真円形状の境界線ＢＬ１が形成されている。貫通孔１３は、円環状リテーナ２と環状弾性リング１との境界線ＢＬ１よりも僅かに内側の位置で、段壁部２１に沿って周方向に複数個を一列に並べて配設され、ブリッジ部３は、環状弾性リング１に埋没状として所定ピッチで複数個夫々が円周方向細長状に形成されている。つまり、本発明のシールワッシャは、図１のようにシンプルですっきりした美しい外観となって、しかも、成型時のバリ取りが容易に行える。 As shown in the plan view of FIG. 2, in the seal washer of the present invention, the boundary line BL1 between the annular retainer 2 and the annular elastic ring 1 is a perfect circle.
The elastic ring 1 heats and presses unvulcanized raw rubber material poured so as to surround the thin inner peripheral edge 20 during insert molding, and exceeds the thickness dimension T 2 of the annular retainer 2. It is vulcanized and molded in a bulge shape with a wall thickness dimension T 1 so as to protrude (project in the thickness direction). The annular retainer 2 surrounds the outer peripheral surface of the elastic ring 1 by a cylindrical step wall portion 21, and a perfectly circular boundary line BL 1 without irregularities is formed along the cylindrical step wall portion 21. A plurality of through holes 13 are arranged in a row in the circumferential direction along the step wall portion 21 at a position slightly inside the boundary line BL 1 between the annular retainer 2 and the annular elastic ring 1. A plurality of portions 3 are embedded in the annular elastic ring 1 and formed in a circumferentially elongated shape at a predetermined pitch. That is, the seal washer of the present invention has a simple, clean and beautiful appearance as shown in FIG. 1, and can be easily deburred during molding.

円環状リテーナ２は、平面視に於て、薄肉内周縁部２０の全面積Ｓ０に対し、複数個の貫通孔１３の総面積Ｓ１が２０％〜６０％に設定されている。
より好ましくは、複数個の貫通孔１３の総面積Ｓ１は、薄肉内周縁部２０の全面積Ｓ０の３０％〜５０％とする。
薄肉内周縁部２０の全面積Ｓ０に対する貫通孔１３の総面積Ｓ１の占有率が、下限値未満であると、締め付けトルクにより生じる周方向の力に対するブリッジ強度が不足し、上限値を越えると、薄肉内周縁部２０の強度が確保できない。 An annular retainer 2 At a plan view, relative to the total area S 0 of the thin inner periphery portion 20, the total area S 1 of the plurality of through holes 13 is set to 20% to 60%.
More preferably, the total area S 1 of the plurality of through holes 13 is 30% to 50% of the total area S 0 of the thin inner peripheral edge 20.
The total area S 1 of the occupancy rate of the through-hole 13 to the total area S 0 of the thin inner peripheral edge portion 20 is less than the lower limit, insufficient bridge strength against circumferential force caused by the tightening torque, exceeds the upper limit value And the intensity | strength of the thin inner peripheral part 20 cannot be ensured.

図４〜図６には、本発明の他の実施形態を示している。
円環状リテーナ２に薄肉内周縁部２０を設け、薄肉内周縁部２０に複数個の貫通孔１３を形成し、インサート成形にて、貫通孔１３を充填して表裏を連結したブリッジ部３を形成すると共に薄肉内周縁部２０を抱込状として環状弾性リング１を一体成形しており、薄肉内周縁部２０に形成された貫通孔１３を、円周方向細長状に形成して、所定ピッチで周方向に複数個を一列に並べて配設し、貫通孔１３に充填された表裏連結状のブリッジ部３が円周方向細長形状に形成されている点で、上述の実施形態と同様である。相違しているのは、弾性リング１の内周面にリップを有していない点である。言い換えると、図４〜図６では、弾性リング１の内周面は、平滑な円筒面となっている。
図５に示すように、円環状リテーナ２と環状弾性リング１との境界線ＢＬ１が真円形状であって、平面視に於て、薄肉内周縁部２０の全面積Ｓ０に対し、複数個の貫通孔１３の総面積Ｓ１が２０％〜６０％に設定されている。その他の構成は、図１〜図３のシールワッシャと同様である。 4 to 6 show other embodiments of the present invention.
The annular retainer 2 is provided with a thin inner peripheral edge portion 20, a plurality of through holes 13 are formed in the thin inner peripheral edge portion 20, and the bridge portion 3 is formed by filling the through holes 13 and connecting the front and back by insert molding. In addition, the annular elastic ring 1 is integrally formed with the thin inner peripheral edge 20 as an embedding shape, and the through holes 13 formed in the thin inner peripheral edge 20 are formed in an elongated shape in the circumferential direction at a predetermined pitch. This is the same as the above-described embodiment in that a plurality of bridge portions 3 that are arranged in a row in the circumferential direction and are connected to the through-holes 13 are formed in a circumferentially elongated shape. The difference is that the inner peripheral surface of the elastic ring 1 does not have a lip. In other words, in FIGS. 4 to 6, the inner peripheral surface of the elastic ring 1 is a smooth cylindrical surface.
As shown in FIG. 5, the boundary line BL 1 between the annular retainer 2 and the annular elastic ring 1 has a perfect circle shape, and a plurality of the boundary lines BL 1 with respect to the total area S 0 of the thin inner peripheral edge 20 in a plan view. the total area S 1 of the number of the through-hole 13 is set to 20% to 60%. Other configurations are the same as those of the seal washer of FIGS.

上述した本発明のシールワッシャの使用方法（作用）について説明する。
図７は、本発明のシールワッシャ（図１〜図３参照）をボルト等の雄ねじ部１４に挿通し、ナット５を相手部材６に対して締付ける直前の状態を示している。
図７に示す締付前使用状態では、弾性リング１には軸心方向の圧縮力が作用しておらず、弾性リング１の肉厚寸法Ｔ１は、円環状リテーナ２の厚さ寸法Ｔ２よりも大きく、雄ねじ部１４に弱く当たった状態で保持される。この際、弾性リング１の小リップ８は、その先端が雄ねじ部１４の谷部に入り込み、シールワッシャの中心点とナット５の締付軸心Ｌ０とを一致させる調心の役目を果たしている。 The use method (action) of the above-described seal washer of the present invention will be described.
FIG. 7 shows a state immediately before the seal washer (see FIGS. 1 to 3) of the present invention is inserted into the male screw portion 14 such as a bolt and the nut 5 is tightened to the mating member 6.
In the state before use shown in FIG. 7, the elastic ring 1 is not subjected to axial compressive force, and the thickness T 1 of the elastic ring 1 is equal to the thickness T 2 of the annular retainer 2. And is held in a state of weakly hitting the male screw portion 14. At this time, the small lip 8 of the elastic ring 1 has a tip that enters the valley of the male screw portion 14 and plays a role of aligning the center point of the seal washer with the tightening axis L 0 of the nut 5. .

次に、図８に示すように、ナット５を締付ける方向に回して、弾性リング１に軸心方向の圧縮力を付与しつつ円環状リテーナ２にナット５が当たるまで締付ける。弾性リング１は、ナット５の圧縮力によって、その厚みが円環状リテーナ２の厚さ寸法Ｔ２とほぼ同等となるまで弾性変形し、ナット５及び相手部材６に密着する。また、弾性リング１は、圧縮力により内径側に膨出し、雄ねじ部１４に弾発的に密着し、かつ、小リップ８が雄ねじ部１４の谷部に強く圧接する。この際、弾性リング１は、ナット５及び相手部材６との摩擦により周方向に強い捩じり力を受けるが、（円周方向細長状の貫通孔１３に充填された）ブリッジ部３が細長形状であるが故に、周方向の捩じり力に対する強度が向上しており、高いトルクをもって締付けを行った場合でも、損傷を受けることなく、確実にシールを行う。なお、本発明のシールワッシャは、内圧・外圧のいずれのシールとしても使用でき、気体又は液体に対応できる。また、ナット５の締付けを緩めて、再度締付けを行う場合であっても、弾性リング１のシール機能を保持することができ、１０回以上の繰り返し再使用が可能である。 Next, as shown in FIG. 8, the nut 5 is turned in the tightening direction, and is tightened until the nut 5 hits the annular retainer 2 while applying a compressive force in the axial direction to the elastic ring 1. The elastic ring 1 is elastically deformed by the compressive force of the nut 5 until the thickness thereof is substantially equal to the thickness dimension T 2 of the annular retainer 2, and is in close contact with the nut 5 and the mating member 6. Further, the elastic ring 1 bulges toward the inner diameter side due to the compressive force, elastically adheres to the male screw portion 14, and the small lip 8 strongly presses against the valley portion of the male screw portion 14. At this time, the elastic ring 1 receives a strong torsional force in the circumferential direction due to friction between the nut 5 and the counterpart member 6, but the bridge portion 3 (filled in the circumferentially elongated through hole 13) is elongated. Because of its shape, the strength against the torsional force in the circumferential direction is improved, and even when tightened with a high torque, sealing is performed without damage. Note that the seal washer of the present invention can be used as either an internal pressure or an external pressure seal, and can cope with gas or liquid. Further, even when the nut 5 is loosened and re-tightened, the sealing function of the elastic ring 1 can be maintained and can be reused ten or more times.

なお、本発明は、設計変更可能であって、貫通孔１３の両端は隅部がＲ状に形成されたものに限定されず、例えば、図９に示すように、貫通孔１３が円周方向細長状であれば（弯曲した）矩形状に形成されていても良く、この場合、ブリッジ部３は、円周方向細長の弯曲矩形状に形成される。
また、図示省略するが、本発明のシールワッシャは、小リップ８が２箇所乃至４箇所以上に設けられていても良く、さらに、リベット等の軸部のような平滑外周面の密封に使用される場合には、弾性リング１の小リップ８（図１参照）が、平滑外周面に強く密着してシールを行う。 The present invention can be modified in design, and the both ends of the through hole 13 are not limited to those having corners formed in an R shape. For example, as shown in FIG. If it is elongated, it may be formed in a rectangular shape (curved). In this case, the bridge portion 3 is formed in a circumferentially elongated curved rectangle.
Although not shown, the seal washer according to the present invention may be provided with two to four or more small lips 8 and is used for sealing a smooth outer peripheral surface such as a shaft portion such as a rivet. In this case, the small lip 8 (see FIG. 1) of the elastic ring 1 is tightly adhered to the smooth outer peripheral surface for sealing.

以上のように、本発明に係るシールワッシャは、円環状リテーナ２に薄肉内周縁部２０を設け、薄肉内周縁部２０に複数個の貫通孔１３を形成し、インサート成形にて、貫通孔１３を充填して表裏を連結したブリッジ部３を形成すると共に薄肉内周縁部２０を抱込状として環状弾性リング１を一体成形したシールワッシャに於て、薄肉内周縁部２０に形成された貫通孔１３を、円周方向細長状に形成して、所定ピッチで周方向に複数個を一列に並べて配設し、貫通孔１３に充填された表裏連結状のブリッジ部３が円周方向細長形状に形成されているので、締付トルクによる周方向の力に対してのブリッジ部３の強度が増し、より高いトルクでの締付けが可能となり、かつ、繰り返し締付け再使用できる。貫通孔１３を（円周方向）細長状としたことで、加工時に使用する穴あけパンチの強度が増し、治工具の使用耐久性が向上する。弾性リング１の剥離・脱落を防止でき、長期間にわたってシール性能を確実に保持できる。   As described above, in the seal washer according to the present invention, the annular retainer 2 is provided with the thin inner peripheral edge 20, the plurality of through holes 13 are formed in the thin inner peripheral edge 20, and the through holes 13 are formed by insert molding. In the seal washer in which the annular elastic ring 1 is integrally formed with the thin inner peripheral edge 20 as an embedding shape, the through-hole formed in the thin inner peripheral edge 20 is formed. 13 is formed in a circumferentially elongated shape, and a plurality of circumferentially-arranged bridge portions 3 are arranged in a row at a predetermined pitch, and the front and back connected bridge portions 3 filled in the through holes 13 are formed in a circumferentially elongated shape. Since it is formed, the strength of the bridge portion 3 with respect to the circumferential force due to the tightening torque is increased, tightening with a higher torque is possible, and repeated tightening and reuse can be performed. By making the through-holes 13 elongated in the (circumferential direction), the strength of the drilling punch used at the time of processing is increased, and the durability of the tool is improved. It is possible to prevent the elastic ring 1 from peeling and dropping, and to reliably maintain the sealing performance over a long period of time.

また、円環状リテーナ２と環状弾性リング１との境界線ＢＬ１が真円形状であるので、成型時のバリ仕上げが容易となり、バリの残留を軽減できる。即ち、外観上美しく製作することができ、かつ、使用時のバリの脱落によるシール性の低下や環境被害を防止できる。 Further, since the boundary line BL 1 of an annular retainer 2 and the annular resilient ring 1 is true circular shape, burrs finish during molding becomes easy and can reduce the residual burrs. That is, it can be produced beautifully in appearance and can prevent deterioration of sealing performance and environmental damage due to burrs falling off during use.

また、円環状リテーナ２は、平面視に於て、薄肉内周縁部２０の全面積Ｓ０に対し、複数個の貫通孔１３の総面積Ｓ１が２０％〜６０％に設定されているので、ブリッジ部３の強度を向上でき、かつ、薄肉内周縁部２０の強度を十分に確保できる。 Also, an annular retainer 2 At a plan view, relative to the total area S 0 of the thin inner periphery portion 20, since the total area S 1 of the plurality of through holes 13 is set to 20% to 60% The strength of the bridge portion 3 can be improved, and the strength of the thin inner peripheral edge portion 20 can be sufficiently secured.

１ 環状弾性リング
２ 円環状リテーナ
３ ブリッジ部
１３ 貫通孔
２０ 薄肉内周縁部
ＢＬ１ 境界線
Ｓ０ 全面積
Ｓ１ 総面積 DESCRIPTION OF SYMBOLS 1 Circular elastic ring 2 Circular retainer 3 Bridge part 13 Through-hole 20 Thin inner peripheral edge BL 1 Boundary line S 0 Total area S 1 Total area

Claims (2)

円環状リテーナ（２）に薄肉内周縁部（２０）を設け、該薄肉内周縁部（２０）に複数個の貫通孔（１３）を形成し、インサート成形にて、該貫通孔（１３）を充填して表裏を連結したブリッジ部（３）を形成すると共に上記薄肉内周縁部（２０）を抱込状として環状弾性リング（１）を一体成形したシールワッシャに於て、
上記薄肉内周縁部（２０）に形成された上記貫通孔（１３）を、円周方向細長状に形成して、所定ピッチで周方向に複数個を一列に並べて配設し、該貫通孔（１３）に充填された表裏連結状のブリッジ部（３）が円周方向細長形状に形成され、
平面視に於て、上記薄肉内周縁部（２０）の全面積（Ｓ ０ ）に対し、上記複数個の貫通孔（１３）の総面積（Ｓ １ ）が２０％〜６０％に設定されていることを特徴とするシールワッシャ。 An annular retainer (2) is provided with a thin inner peripheral edge (20), a plurality of through holes (13) are formed in the thin inner peripheral edge (20), and the through holes (13) are formed by insert molding. In a seal washer in which a bridge portion (3) is formed by filling and connecting the front and back, and the annular inner ring (1) is integrally formed with the thin inner peripheral edge (20) as an embedding shape,
The through-hole (13) formed in the thin inner peripheral edge (20) is formed in an elongated shape in the circumferential direction, and a plurality of the through-holes (13) are arranged in a row in the circumferential direction at a predetermined pitch. 13) The front and back connected bridge portion (3) filled in 13) is formed in a circumferentially elongated shape ,
At a plan view, the thin inner peripheral edge portion with respect to (20) the total area of the (S 0), the total area of the plurality of through holes (13) (S 1) is set to 20% to 60% A seal washer characterized by 上記円環状リテーナ（２）と上記環状弾性リング（１）との境界線（ＢＬ１）が真円形状である請求項１記載のシールワッシャ。 The seal washer according to claim 1, wherein a boundary line (BL 1 ) between the annular retainer (2) and the annular elastic ring ( 1 ) has a perfect circular shape.
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