JP7064336B2 - Weather Strip - Google Patents

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JP7064336B2
JP7064336B2 JP2018007602A JP2018007602A JP7064336B2 JP 7064336 B2 JP7064336 B2 JP 7064336B2 JP 2018007602 A JP2018007602 A JP 2018007602A JP 2018007602 A JP2018007602 A JP 2018007602A JP 7064336 B2 JP7064336 B2 JP 7064336B2
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door
weather strip
compression
hollow
opening
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JP2018122852A5 (en
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吉孝 西本
武 上田
浩之 川上
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Nishikawa Rubber Co Ltd
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Nishikawa Rubber Co Ltd
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Priority to US15/880,142 priority Critical patent/US10300776B2/en
Priority to DE102018101661.1A priority patent/DE102018101661A1/en
Priority to CN201810082763.3A priority patent/CN108372774A/en
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Description

本発明は、自動車のサイドドア,バックドア,トランクリッド,フード等の開閉体の周縁又は該開閉体の開口周縁に取付けられ、開閉体の閉時にボディ側又は開閉体に弾接して開閉体とボディとの間をシールするウェザーストリップに関する。 INDUSTRIAL APPLICABILITY The present invention is attached to the peripheral edge of an opening / closing body such as a side door, a back door, a trunk lid, a hood, etc. Regarding the weather strip that seals between the body and the body.

従来、図6に示すように、自動車のサイドドア1の周縁にはウェザーストリップ10が取付けられ、サイドドドア1の閉時にボディ2側に弾接してサイドドア1とボディ2の間をシールしている。
ウェザーストリップ10は、図7に示すように、サイドドア1に設けられた枠体1aに嵌合される取付基部11と、取付基部11に一体成形され、サイドドア1の閉時にボディ2のドア開口周縁に弾接する中空シール部12を備えている。通常、この中空シール部12は柔軟性、耐候性、伸び、剛性を考慮して比重0.35~0.65のEPDMのスポンジゴムが使用されている。
Conventionally, as shown in FIG. 6, a weather strip 10 is attached to the peripheral edge of the side door 1 of an automobile, and when the sided door 1 is closed, the weather strip 10 is elastically contacted with the body 2 side to seal between the side door 1 and the body 2. ..
As shown in FIG. 7, the weather strip 10 is integrally molded with the mounting base 11 fitted to the frame body 1a provided on the side door 1 and the mounting base 11, and the door of the body 2 is formed when the side door 1 is closed. A hollow seal portion 12 that comes into contact with the peripheral edge of the opening is provided. Normally, EPDM sponge rubber having a specific gravity of 0.35 to 0.65 is used for the hollow seal portion 12 in consideration of flexibility, weather resistance, elongation, and rigidity.

このようなウェザーストリップ10においては、サイドドア1の閉時に中空シール部12がボディ2側に弾接する際の変形追従性能を向上させることが求められる。そして、外部からの水、風、埃、音などの侵入を防止するため、サイドドア1閉時に相当程度の反力で密閉状態が作られる、所謂シール性能が要求される。従って、従来、ウェザーストリップ10にとって一般的な評価指標とされる圧縮荷重値(速度20mm/minで中空シール部12を押し潰し方向に圧縮撓み変形する試験によって得られる測定値)を調整することでシール性能を確認してきた。 In such a weather strip 10, it is required to improve the deformation follow-up performance when the hollow seal portion 12 comes into contact with the body 2 side when the side door 1 is closed. Then, in order to prevent water, wind, dust, sound, etc. from entering from the outside, so-called sealing performance is required in which a sealed state is created by a considerable reaction force when the side door 1 is closed. Therefore, by adjusting the compression load value (measured value obtained by a test in which the hollow seal portion 12 is compressed and flexed and deformed in the crushing direction at a speed of 20 mm / min), which is conventionally regarded as a general evaluation index for the weather strip 10. We have confirmed the sealing performance.

しかし、中空シール部12の反力を大きくするとサイドドア1を閉じる際の力が増し、ドア閉じ行為が難しくなる、所謂ドア閉じ性が悪くなるといった問題がある。
また、従来、開閉体に備わっているウェザーストリップにおいてドア閉じ性を向上させるには、上記した圧縮荷重値を下げるといった考え方しかなく、その方法としては、中空シール部12の肉厚を部分的に薄くすることや、低比重や低弾性率な材料を中空シール部12に使用することであった(特許文献1,2)。
However, if the reaction force of the hollow seal portion 12 is increased, the force for closing the side door 1 is increased, which makes it difficult to close the door, and there is a problem that the so-called door closing property is deteriorated.
Further, conventionally, the only way to improve the door closing property in the weather strip provided in the opening / closing body is to reduce the above-mentioned compression load value, and as a method, the wall thickness of the hollow seal portion 12 is partially reduced. It was to make it thinner and to use a material having a low specific gravity and a low elastic modulus for the hollow seal portion 12 (Patent Documents 1 and 2).

特開2011-183935号公報Japanese Unexamined Patent Publication No. 2011-183935 特許第5587062号公報Japanese Patent No. 5587062

しかしながら、中空シール部12の肉厚を部分的に薄くしたものや、低比重や低弾性率な材料を使用したものでは、サイドドア1を閉切り状態にしたとき、つまりサイドドア1閉時に中空シール部12のシール面圧が低下し、止水性能等のシール性能悪化に繋がることがあった。 However, in the case where the wall thickness of the hollow seal portion 12 is partially reduced or a material having a low specific gravity or a low elastic modulus is used, the side door 1 is hollow when the side door 1 is closed, that is, when the side door 1 is closed. The sealing surface pressure of the sealing portion 12 may decrease, which may lead to deterioration of sealing performance such as water stopping performance.

これは、上述したような、一般的な評価指標とされる圧縮荷重値については、中空シール部12の静的反力と捉えることができ、これに対して動的反力については考慮されていなかったからである。
すなわち、ゴムの反発は、静的反力と動的反力からなり、静的と動的という圧縮時の速度で異なる。静的は、見るからに速度が無い又は超低速度の移動による圧縮であり、動的は、見るからに速度があり高速度の移動による圧縮である。そして、静的はドア閉時のシール性能に影響し、動的はドアを閉じる際のドア閉じ性に影響する。
As described above, the compression load value, which is a general evaluation index, can be regarded as the static reaction force of the hollow seal portion 12, whereas the dynamic reaction force is considered. Because it wasn't.
That is, the repulsion of rubber consists of a static reaction force and a dynamic reaction force, and differs depending on the compression speeds of static and dynamic. Static is compression with no speed or ultra-low speed movement as seen, and dynamic is compression with speed and high speed movement as seen. Statically affects the sealing performance when the door is closed, and dynamic affects the door closing property when the door is closed.

これまでは、このような速度による圧縮荷重値の相違について議論されて来なかったが、図8に示すように、ゴムなどのゴム様弾性体からなる中空状物を圧縮し、一定の圧縮量で圧縮の動きを止める場合、中空状物の反力は、当初、一時的に飛び上がるものの、極大値を示した後に時間の経過とともに低下し、一定の値に到達する挙動を示す。圧縮の動きが無く一定の圧縮量にある状態、つまり静的な圧縮状態における反発力(A)に対して、高速に圧縮量が変化している状態、つまり動的な圧縮状態における反発力は(α)が加わり、全反力は(A+α)となることがわかっている。αは材料の粘性を示すものである。 Until now, the difference in compression load value due to such speed has not been discussed, but as shown in FIG. 8, a hollow object made of a rubber-like elastic body such as rubber is compressed, and a constant compression amount is obtained. When the motion of compression is stopped, the reaction force of the hollow object initially jumps up temporarily, but after showing a maximum value, it decreases with the passage of time and shows a behavior of reaching a constant value. The repulsive force in a state where there is no compression movement and is in a constant compression amount, that is, in a static compression state, that is, in a state where the compression amount changes at a high speed, that is, in a dynamic compression state, is compared with the repulsive force (A). It is known that (α) is added and the total reaction force becomes (A + α). α indicates the viscosity of the material.

そこで、本発明者は、ドア閉じ性能を向上させる、つまり低エネルギーでもドアを閉じるための手段として、材質の粘性(損失弾性率:運動エネルギーを熱エネルギー等へ変換する性能)に注目し、これを限りなくゼロにすることを考えた。
中空シール部12の材料の粘性を示すαの値が小さくなれば、静的な圧縮状態と動的な圧縮状態において圧縮荷重値が変わらなくなる。従って、静的なシール面圧を保ちつつ、つまりドア閉じ状態でのシール性能(止水性能等)を高い状態に満足させながら、ドアを閉じる際の動的な圧縮荷重を下げることが可能となると考える。
Therefore, the present inventor paid attention to the viscosity of the material (elastic modulus of loss: performance of converting kinetic energy into heat energy, etc.) as a means for improving the door closing performance, that is, closing the door even with low energy. I thought about making it as zero as possible.
When the value of α indicating the viscosity of the material of the hollow seal portion 12 becomes small, the compression load value does not change between the static compression state and the dynamic compression state. Therefore, it is possible to reduce the dynamic compression load when closing the door while maintaining the static sealing surface pressure, that is, satisfying the high sealing performance (water stopping performance, etc.) when the door is closed. I think it will be.

なお、特許文献1及び特許文献2には、ドア閉じ性が悪化することを防止する旨の記載があるがドア閉じ性に関連して中空シール部の材質の粘性を示す損失弾性率については一切記載されていない。また、何ら示唆する記載もない。 In addition, although there is a description in Patent Document 1 and Patent Document 2 that the door closing property is prevented from being deteriorated, the loss elastic modulus indicating the viscosity of the material of the hollow seal portion in relation to the door closing property is not at all. Not listed. Also, there is no suggestion.

そこで、本発明の目的とするところは、ゴム様弾性体の材質の粘性に着目してドア閉じ性を向上させるウェザーストリップを提供することにある。 Therefore, an object of the present invention is to provide a weather strip that improves the door closing property by focusing on the viscosity of the material of the rubber-like elastic body.

上記の目的を達成するために、本発明のウェザーストリップは、車両の開閉体周縁又は開口周縁に取付けられる取付基部(21)と、前記取付基部(21)に一体成形され前記開閉体(1)の閉時に前記車両のボディ(2)側の開閉体(1)開口周縁又は開閉体(1)周縁に弾接するシール部(22)を備えたウェザーストリップ(20)であって、
前記シール部(22)を、比重を0.35以上0.65以下とし、損失弾性率を0.25MPa以下のゴム様弾性体からなるスポンジ材で構成したことを特徴とする。
In order to achieve the above object, the weatherstrip of the present invention is integrally molded with a mounting base portion (21) attached to the peripheral edge of an opening / closing body or an opening peripheral edge of a vehicle, and the opening / closing body (1). A weatherstrip (20) provided with a sealing portion (22) that comes into contact with the opening / closing peripheral edge (1) opening peripheral edge or the opening / closing body (1) peripheral edge of the vehicle body (2) side when the vehicle is closed.
The sealing portion (22) is characterized in that it is made of a sponge material made of a rubber-like elastic body having a specific gravity of 0.35 or more and 0.65 or less and a loss elastic modulus of 0.25 MPa or less.

また本発明は、前記シール部(22)を、比重を0.35以上0.65以下とし、前記損失弾性率を0.20MPa以下のスポンジ材で構成したことを特徴とする。 Further, the present invention is characterized in that the sealing portion (22) is made of a sponge material having a specific gravity of 0.35 or more and 0.65 or less and a loss elastic modulus of 0.20 MPa or less.

また本発明は、前記シール部(22)は中空シール部であり、圧縮永久歪み(70℃×200hr)が25%以下であることを特徴とする。 Further, the present invention is characterized in that the seal portion (22) is a hollow seal portion and the compression set (70 ° C. × 200 hr) is 25% or less.

なお、括弧内の記号は、図面および後述する発明を実施するための形態に記載された対応要素または対応事項を示す。 The symbols in parentheses indicate the corresponding elements or corresponding items described in the drawings and the embodiment for carrying out the invention described later.

本発明によれば、自動車のサイドドア,バックドア,トランクリッド,フード等の開閉体周縁又は開閉体の開口周縁に取付けられ、開閉体の閉時にボディ側の開閉体開口周縁又は開閉体周縁に弾接するウェザーストリップのシール部を構成するゴム様弾性体からなる材質の粘性に注目し、特にその材質を、比重を0.35以上0.65以下とし、損失弾性率を0.25MPa以下のスポンジ材で構成したので、ドア閉じ状態でのシール性能を高い状態に満足させながら、ドアを閉じる際の動的な圧縮荷重からなるエネルギー量を下げることができる。
よって、従来例のように、シール部の肉厚を部分的に薄くすると言った形状や構造による工夫をすることなく、シール性を確保した状態でドア閉じ性を向上させることができる。
According to the present invention, it is attached to the peripheral edge of an opening / closing body such as a side door, a back door, a trunk lid, a hood, etc. Pay attention to the viscosity of the material made of the rubber-like elastic body that constitutes the seal part of the weather strip that comes into contact with the bullet, and in particular, the material is a sponge with a specific gravity of 0.35 or more and 0.65 or less and a loss elastic modulus of 0.25 MPa or less. Since it is made of material, it is possible to reduce the amount of energy consisting of a dynamic compressive load when closing the door, while satisfying the high sealing performance when the door is closed.
Therefore, unlike the conventional example, it is possible to improve the door closing property while ensuring the sealing property without devising the shape and structure such as partially thinning the wall thickness of the sealing portion.

また、本発明によれば、シール部を、損失弾性率をさらに0.20MPa以下のスポンジ材で構成したので、一層、ドア閉じ性を向上させることができる。 Further, according to the present invention, since the seal portion is made of a sponge material having a loss elastic modulus of 0.20 MPa or less, the door closing property can be further improved.

また、本発明によれば、シール部が中空状の中空シール部であり、圧縮永久歪み(70℃×200hr)が25%以下であるため、経年後でも中空シール部の歪みが小さく、当初(初期状態)の形態を維持することから、初期時の圧縮量を大きくする必要がなく、従ってドア閉じ性を良くすることができる。 Further, according to the present invention, since the seal portion is a hollow hollow seal portion and the compression set is 25% or less (70 ° C. × 200 hr), the strain of the hollow seal portion is small even after aging, and initially ( Since the morphology of the initial state) is maintained, it is not necessary to increase the amount of compression at the initial stage, and therefore the door closing property can be improved.

本発明の実施形態に係るウェザーストリップを示す図6のA-A線拡大断面図である。FIG. 6 is an enlarged cross-sectional view taken along the line AA of FIG. 6 showing a weather strip according to an embodiment of the present invention. 試験用中空形状を示した断面図である。It is sectional drawing which showed the hollow shape for a test. サイドドアの開閉速度を速度計で測定する様子を示す自動車の平面図である。It is a top view of the automobile which shows the state of measuring the opening / closing speed of a side door with a speedometer. 中空シール部を構成するスポンジ材の損失弾性率を示すグラフである。It is a graph which shows the loss elastic modulus of the sponge material which constitutes a hollow seal part. 中空シール部を構成するスポンジ材の損失正接(tanδ:タンデルタ)を示すグラフである。It is a graph which shows the loss tangent (tan δ: tan delta) of the sponge material which constitutes a hollow seal part. サイドドアが開放された状態を示す自動車の斜視図である。It is a perspective view of the car which shows the state which the side door is open. 従来例に係るウェザーストリップを示す図6のA-A線拡大断面図である。FIG. 6 is an enlarged cross-sectional view taken along the line AA of FIG. 6 showing a weather strip according to a conventional example. 中空シール部の反力を示すグラフである。It is a graph which shows the reaction force of the hollow seal part.

本発明の実施形態に係るウェザーストリップ20について、図1を参照して説明する。
このウェザーストリップ20は、従来例で示したウェザーストリップ10(図7)と同様に、車両のサイドドア1に取付けられる取付基部21と、その取付基部21に一体成形されサイドドア1の閉時にボディ2側のドア開口周縁に弾接する中空シール部22を備えたものであるが、特に中空シール部22の材質に特徴性を有するものである。
なお、従来例(図7)と同様のものについては同様の符号を付した。
The weatherstrip 20 according to the embodiment of the present invention will be described with reference to FIG.
Similar to the weather strip 10 (FIG. 7) shown in the conventional example, the weather strip 20 is integrally molded with a mounting base 21 mounted on the side door 1 of the vehicle and the mounting base 21, and the body is formed when the side door 1 is closed. It is provided with a hollow seal portion 22 that comes into contact with the peripheral edge of the door opening on the second side, and is particularly characterized by the material of the hollow seal portion 22.
The same reference numerals as those of the conventional example (FIG. 7) are given.

本発明の実施形態に係るウェザーストリップ20の中空シール部22については、比重が0.35以上0.65以下で、かつ損失弾性率を0.23MPaのゴム様弾性体からなるスポンジ材で構成したものである。ここでゴム様弾性体とはEPDM(エチレン・プロピレン・ジエンゴム)を主体とするゴム材料を使用している。なお、EPDMに限らず、他の合成ゴムを主体とするゴム材料や、各種熱可塑性エラストマーでもよい。 The hollow seal portion 22 of the weather strip 20 according to the embodiment of the present invention is made of a sponge material made of a rubber-like elastic body having a specific gravity of 0.35 or more and 0.65 or less and a loss elastic modulus of 0.23 MPa. It is a thing. Here, the rubber-like elastic body uses a rubber material mainly composed of EPDM (ethylene, propylene, diene rubber). Not limited to EPDM, other rubber materials mainly composed of synthetic rubber and various thermoplastic elastomers may be used.

すなわち、本実施形態では、中空シール部22を構成するスポンジ材の材質の粘性に着目して、粘性を示す損失弾性率を種々変化させて試験を行った結果、中空シール部22の材料としては、上述したように、比重を0.35以上0.65以下とし、且つ損失弾性率を0.23MPaのスポンジ材で構成することが好ましいことがわかった。
なお、損失弾性率については、後述する圧縮荷重値を測定した中空形状100から試験体を採取し、DVA-225(アイティー計測制御社製)を使用して、複数の周波数の引張モードにて、雰囲気をAir,-80℃~100℃の温度範囲において各温度帯で順次測定した。図4と図5に代表として、温度を20℃,周波数を10.0Hzとした測定結果を示す。(試験方法はJIS K7244-4に準拠,試験サンプルはJIS K6394引張方法に準拠)
That is, in the present embodiment, paying attention to the viscosity of the material of the sponge material constituting the hollow seal portion 22, the test was performed by variously changing the loss elastic modulus indicating the viscosity, and as a result, the material of the hollow seal portion 22 was used. As described above, it was found that it is preferable to use a sponge material having a specific gravity of 0.35 or more and 0.65 or less and a loss elastic modulus of 0.23 MPa.
Regarding the loss elastic modulus, a test piece was taken from the hollow shape 100 for which the compressive load value described later was measured, and DVA-225 (manufactured by IT Measurement Control Co., Ltd.) was used in a tensile mode at a plurality of frequencies. , The atmosphere was sequentially measured in each temperature range in the temperature range of Air, −80 ° C. to 100 ° C. As a representative of FIGS. 4 and 5, the measurement results at a temperature of 20 ° C. and a frequency of 10.0 Hz are shown. (The test method conforms to JIS K7244-4, and the test sample conforms to JIS K6394 tensile method)

このような損失弾性率0.23MPaのゴム様弾性体からなるスポンジ材(比重0.49)で構成した中空形状100(発明品)の静的反力、及び動的エネルギー量(動的反力により生じる圧縮の際のエネルギー量)を、従来の材質からなるスポンジ材で構成した従来品と比較して試験した。結果を、表1に示した。ここで従来品は損失弾性率が0.59MPaで比重が0.55であった。 The static reaction force and the amount of dynamic energy (dynamic reaction force) of the hollow shape 100 (invention) made of a sponge material (specific gravity 0.49) made of a rubber-like elastic body having such a loss elastic modulus of 0.23 MPa. The amount of energy generated during compression) was tested in comparison with a conventional product made of a sponge material made of a conventional material. The results are shown in Table 1. Here, the conventional product had a loss elastic modulus of 0.59 MPa and a specific gravity of 0.55.

Figure 0007064336000001
Figure 0007064336000001

これは、図2に示すような試験用中空形状100(特開2016-169243号を参照)の材料として、本実施形態のように比重0.49,損失弾性率0.23MPaのスポンジ材で構成した試験用中空形状100(発明品)と、比重0.55,損失弾性率0.59MPaのスポンジ材で構成した試験用中空形状100(従来品)で比較したものである。
なお、試験条件としては、23℃の雰囲気において、試験体の試験用中空形状100を平板に固定して中空上から平板で50%高さまで圧縮した際の荷重値を記録したものである。静的反力については、圧縮速度を20mm/minとし、50%の高さ位置における荷重値(シール性能の指標)を示し、動的エネルギー量の指標としては、圧縮速度を1.2m/secとし、中空上から平板で高さが50%の位置に達するまでに要したエネルギー量(ドア閉じ性の指標であって、荷重値の積分)としている。
This is composed of a sponge material having a specific gravity of 0.49 and a loss elastic modulus of 0.23 MPa as the material of the test hollow shape 100 (see Japanese Patent Application Laid-Open No. 2016-169243) as shown in FIG. This is a comparison between the test hollow shape 100 (invention product) and the test hollow shape 100 (conventional product) made of a sponge material having a specific gravity of 0.55 and a loss elastic modulus of 0.59 MPa.
As the test conditions, the load value when the test hollow shape 100 of the test piece was fixed to a flat plate and compressed to a height of 50% by the flat plate from above the hollow was recorded in an atmosphere of 23 ° C. For static reaction force, the compression speed is set to 20 mm / min, the load value (index of sealing performance) at a height of 50% is shown, and the compression speed is 1.2 m / sec as an index of the amount of dynamic energy. The amount of energy required to reach the position where the height is 50% on the flat plate from above the hollow (an index of door closing property and integration of the load value) is used.

また、発明品の試験用中空形状100は、従来品と同形状にすると静的反力で従来品よりも低いため、静的反力で同等となるように肉厚を調整(厚く)している。その結果、発明品は、静的反力が8(N/100mm),動的エネルギー量が54(×10-3J/100mm)であり、従来品は、静的反力が8(N/100mm),動的エネルギー量が78(×10-3J/100mm)であった。このように、発明品の試験用中空形状100の肉厚は従来品のそれよりも厚いにも関わらず、速い速度で変形させた際(動的)の動的反力から生じるエネルギー量は発明品の方が従来品よりも低いことが解った。発明品の動的エネルギー量は従来品の約70%である。
この動的エネルギー量は、図8で示したグラフでは、粘性(α)の部分が含まれた動的反力によって生じたものであり、発明品と従来品では静的反力(圧縮後の反力)は同等であるが、発明品の方が動的エネルギー量が低く、従って動的反力は低く、その分、変形応答性が良好と言え、ドア閉じ性に有利である。
Further, since the test hollow shape 100 of the invention product has a static reaction force lower than that of the conventional product when it has the same shape as the conventional product, the wall thickness is adjusted (thickened) so that the static reaction force becomes the same. There is. As a result, the invention product has a static reaction force of 8 (N / 100 mm) and a dynamic energy amount of 54 (× 10 -3 J / 100 mm), and the conventional product has a static reaction force of 8 (N / 100 mm). 100 mm), and the amount of dynamic energy was 78 (× 10 -3 J / 100 mm). As described above, although the wall thickness of the test hollow shape 100 of the invention product is thicker than that of the conventional product, the amount of energy generated from the (dynamic) dynamic reaction force when deformed at a high speed is the invention. It turned out that the product was lower than the conventional product. The amount of dynamic energy of the invention product is about 70% of that of the conventional product.
In the graph shown in FIG. 8, this amount of dynamic energy is generated by the dynamic reaction force including the viscous (α) portion, and the static reaction force (after compression) in the invention and the conventional product. The reaction force) is the same, but the invention has a lower amount of dynamic energy, and therefore the dynamic reaction force is lower, so that it can be said that the deformation responsiveness is good and the door closing property is advantageous.

ここで、実際にドア閉じ性を判断する試験を実施した。その試験は、図3に示すように、速度計50を実車に使用して、サイドドア1においてドアロックのかかる最少速度(ロック部の通過速度)を何度も開閉を繰り返して測定するものである。速度計50については、ボディ2の外板からの距離を80mm,サイドドア1が最も近づくドアエッジからの距離を10mmにする位置にセットした。
その結果、表2に示すように、最少のドア閉じ速度は、従来品の1.33(m/sec)に対して、発明品では、1.20(m/sec)であり、発明品によれば従来品と比較して遅い速度でドアを閉じきることができた。
このドア閉じ性を判断する試験は、実際の車両を用い、これのドアに搭載されているウェザーストリップ(図6の10及び20)を、発明品と従来品に置換して実施した。ここで、本試験での発明品と従来品とは、前記した試験用中空形状100の断面形状の試験体ではなく、試験用中空形状100で使用した発明品のスポンジ材、又は従来品のスポンジ材を使用し、搭載していたウェザーストリップを再現した試験体である。この試験体の詳細は示さないが、例えばその断面形状は、図1の形状であって、試験体は中空シール部22だけでなく、取付基部21を含めた全体が同一の発明品又は従来品のスポンジ材で形成されている。
Here, a test was conducted to actually judge the door closeability. In the test, as shown in FIG. 3, a speedometer 50 is used in an actual vehicle, and the minimum speed at which the door lock is applied (passing speed of the lock portion) at the side door 1 is measured by repeatedly opening and closing. be. The speedometer 50 was set at a position where the distance from the outer panel of the body 2 was 80 mm and the distance from the door edge closest to the side door 1 was 10 mm.
As a result, as shown in Table 2, the minimum door closing speed is 1.20 (m / sec) in the invention product, while it is 1.33 (m / sec) in the conventional product. According to this, the door could be closed at a slower speed than the conventional product.
The test for determining the door closing property was carried out by using an actual vehicle and replacing the weather strips (10 and 20 in FIGS. 6) mounted on the door with the invention product and the conventional product. Here, the invention product and the conventional product in this test are not the test piece having the cross-sectional shape of the test hollow shape 100 described above, but the sponge material of the invention product used in the test hollow shape 100, or the sponge of the conventional product. It is a test body that reproduces the weather strip that was mounted using materials. Although the details of this test piece are not shown, for example, the cross-sectional shape thereof is the shape shown in FIG. 1, and the test piece is an invention or a conventional product having the same whole including not only the hollow seal portion 22 but also the mounting base portion 21. It is made of sponge material.

Figure 0007064336000002
Figure 0007064336000002

これによれば、発明品では、小エネルギーでのサイドドア1のドア閉じが可能であり、従来品と比較してドア閉じ性が良好であることが確認された。つまり、単純に考えて、定速運動している物体の持つ運動エネルギーは速度の2乗に比例すると考えられるため、発明品の従来品との速度比が1.20/1.33=約0.9倍であれば、エネルギー量においてはその2乗の約0.8倍になっていることになる。これは、つまりエネルギー量で20%の減少を示していると考えられ、従って、重量に置き換えると、本エネルギーに関わるドア重量相当分が20%減量できると考えることができる。 According to this, it was confirmed that the invention can close the side door 1 with a small amount of energy, and the door closing property is better than that of the conventional product. In other words, simply thinking, the kinetic energy of an object moving at a constant speed is considered to be proportional to the square of the velocity, so the velocity ratio of the invention to the conventional product is 1.20 / 1.33 = about 0. If it is 9.9 times, the amount of energy is about 0.8 times the square. This is considered to indicate a 20% reduction in the amount of energy, and therefore, when replaced with weight, it can be considered that the amount corresponding to the door weight related to this energy can be reduced by 20%.

このように、中空シール部22を、比重が0.35以上0.65以下で、かつ、損失弾性率が0.23MPa以下の物性を有するゴム様弾性体によるスポンジ材で構成すると、速い速度による圧縮撓み変形は、エネルギー量で従来品の20~30%減少させることができる。 As described above, when the hollow seal portion 22 is made of a sponge material made of a rubber-like elastic body having a specific gravity of 0.35 or more and 0.65 or less and a loss elastic modulus of 0.23 MPa or less, the speed is high. The compression deflection deformation can be reduced by 20 to 30% of the conventional product in terms of the amount of energy.

なお、ここでは、発明品を、中空シール部22を比重0.49,損失弾性率0.23MPaのゴム様弾性体によるスポンジ材で構成したが、比重と損失弾性率を種々変化させて、上述したように試験用中空形状100に適用した際の静的反力及び動的エネルギー量を測定するとともに、実車での最少ドア閉じ速度を測定したところ、損失弾性率を0.25MPa以下のスポンジ材で構成したものであれば、動的反力を抑え、従って動的エネルギー量が低くてすみ、結果的にドア閉じ性を向上させることが解った(図4)。さらに損失弾性率を0.20MPa以下のスポンジ材で構成するとさらに動的反力を抑えドア閉じ性を向上させることが確認された。
例えば、中空シール部22を比重0.47,損失弾性率0.18MPaのスポンジ材で構成したものでも優れたドア閉じ性が得られた。
Here, the invention is composed of a hollow seal portion 22 made of a sponge material made of a rubber-like elastic body having a specific gravity of 0.49 and a loss elastic modulus of 0.23 MPa. As described above, the static reaction force and the amount of dynamic energy when applied to the test hollow shape 100 were measured, and the minimum door closing speed in the actual vehicle was measured. As a result, a sponge material with a loss elastic modulus of 0.25 MPa or less was measured. It was found that the dynamic reaction force was suppressed, and therefore the amount of dynamic energy was low, and as a result, the door closing property was improved (Fig. 4). Furthermore, it was confirmed that when the sponge material having a loss elastic modulus of 0.20 MPa or less was used, the dynamic reaction force was further suppressed and the door closing property was improved.
For example, even if the hollow seal portion 22 is made of a sponge material having a specific gravity of 0.47 and a loss elastic modulus of 0.18 MPa, excellent door closing property can be obtained.

また、図4及び図5に示すように、中空シール部22を比重0.49,損失弾性率0.23MPaのスポンジ材で構成したときの損失正接(tanδ:タンデルタ)は、0.163であり、中空シール部22を比重0.47,損失弾性率0.18MPaのスポンジ材で構成したときの損失正接(tanδ:タンデルタ)は、0.157であった。
そして、損失正接(tanδ:タンデルタ)によれば、0.165以下で、より好ましくは0.16以下で中空シール部22を構成したものであれば、動的反力を抑えドア閉じ性を向上させることが確認された。
Further, as shown in FIGS. 4 and 5, the loss tangent (tan δ: tan delta) when the hollow seal portion 22 is made of a sponge material having a specific gravity of 0.49 and a loss elasticity of 0.23 MPa is 0.163. The loss tangent (tan δ: tan delta) when the hollow seal portion 22 was made of a sponge material having a specific gravity of 0.47 and a loss elasticity of 0.18 MPa was 0.157.
According to the loss tangent (tan δ: tan delta), if the hollow seal portion 22 is configured with 0.165 or less, more preferably 0.16 or less, the dynamic reaction force is suppressed and the door closing property is improved. It was confirmed that it would be allowed.

また、中空シール部22を構成するスポンジ材の圧縮永久歪み(CS)は特にドア閉じ性との関係が大きく、圧縮永久歪み(CS)が低いものが好ましい。
圧縮永久歪み(CS)は、図2で示したような、試験用中空形状100のサンプルを、その高さの50%圧縮して70℃×200hr処理し、その処理前後の高さを比較したものを数値化したものである。なお,処理後の高さは,70℃×200hr処理後直ちに圧縮を開放し,23℃雰囲気中で30分経過後に測定する。
圧縮永久歪み(CS)=(t0-t1)/(t0-ts)×100
t0:処理前の高さ(mm)
t1:処理後の高さ(mm)
ts:t0の50%高さ(mm)
サイドドア1の閉切り状態では、ウェザーストリップ20の中空シール部22は、圧縮状態であり、この状態が保持されると、経年でウェザーストリップ20のシール断面は徐々に圧縮された形態に近づいてしまい、当初(初期状態)の歪みを十分に吸収できる形態に復帰しなくなる(撓み形状に近づく)。よって、復帰する量が小さくなると、ロック位置の変わらないドア閉じ切り位置での反発力(シール力)が少なくなってしまう。
ここで、ウェザーストリップ20はこの経年変化を見越して設計されており、経年後でも反発力が十分に発揮されるよう、初期時に大きな圧縮量を設定している。つまり初期は十二分な位置まで圧縮しており、これが初期時のドア閉じ性を悪くしている。
そこで、この経年歪みが発生し難い材質(低CS)にすれば、経年後でも歪みが小さく、当初(初期状態)の形態を維持することから、初期時の圧縮量を大きくする必要がなく、従って初期時からウェザーストリップ20を大きく押込む必要がなく、ドア閉じ性を良くすることができる。
Further, the compression permanent strain (CS) of the sponge material constituting the hollow seal portion 22 has a particularly large relationship with the door closing property, and a material having a low compression permanent strain (CS) is preferable.
For compression set, a sample of hollow shape 100 for test as shown in FIG. 2 was compressed by 50% of its height and treated at 70 ° C. × 200 hr, and the heights before and after the treatment were compared. It is a numerical value of things. The height after the treatment is measured after 30 minutes have passed in an atmosphere of 23 ° C. by releasing the compression immediately after the treatment at 70 ° C. × 200 hr.
Compressive permanent strain (CS) = (t0-t1) / (t0-ts) × 100
t0: Height before processing (mm)
t1: Height after processing (mm)
ts: 50% height of t0 (mm)
In the closed state of the side door 1, the hollow seal portion 22 of the weather strip 20 is in a compressed state, and when this state is maintained, the seal cross section of the weather strip 20 gradually approaches the compressed form over time. Therefore, it does not return to the form that can sufficiently absorb the strain at the beginning (initial state) (approaches the bending shape). Therefore, when the amount of recovery becomes small, the repulsive force (sealing force) at the door closing position where the lock position does not change decreases.
Here, the weatherstrip 20 is designed in anticipation of this secular variation, and a large amount of compression is set at the initial stage so that the repulsive force can be sufficiently exerted even after the aging. In other words, it is compressed to a sufficient position at the initial stage, which deteriorates the door closing property at the initial stage.
Therefore, if a material (low CS) that is less likely to cause aging distortion is used, the distortion will be small even after aging and the initial (initial state) form will be maintained, so there is no need to increase the amount of compression at the initial stage. Therefore, it is not necessary to push the weather strip 20 greatly from the initial stage, and the door closing property can be improved.

ここで、上記した従来品及び発明品(表1及び表2)のスポンジ材の諸物性を測定した。これを表3に示す。
比重は,JIS K6268に準拠,但し,図2で示したような、試験用中空形状100のサンプルを用いる。
吸水率は,図2で示したような、試験用中空形状100のサンプルを50mm程度に裁断し重量を測定する。そのサンプルを23℃の蒸留水中に上端部が水面から50mm程度の深さになるように浸漬し,17kPaに減圧し5分間放置した後,常圧に戻しそのままの状態で3分間放置する。その後,水中からサンプルを取り出し,表面に付いた水滴を注意深く拭き取り重量を測定する。
吸水率 = (W1-W0)/W0×100
W0:試験前の重量(g)
W1:試験後の重量(g)
圧縮永久歪み(CS)は、図2で示したような、試験用中空形状100のサンプル(長さ100mm)を、その高さの50%圧縮して70℃×200hr処理し、その処理前後の高さを比較したものを数値化したものである。なお,処理後の高さは,70℃×200hr処理後直ちに圧縮を開放し,23℃雰囲気中で30分経過後に測定する。
圧縮永久歪み(CS)=(t0-t1)/(t0-ts)×100
t0:処理前の高さ(mm)
t1:処理後の高さ(mm)
ts:t0の50%高さ(mm)
引張り試験(50%モジュラス,100%モジュラス,破断強度,破断伸び)は,JIS K6251に準拠し、試験用中空形状100のサンプルから試験体を採取した。
Here, various physical properties of the sponge materials of the above-mentioned conventional products and invention products (Tables 1 and 2) were measured. This is shown in Table 3.
The specific gravity conforms to JIS K6268, but a sample with a hollow shape for testing 100 as shown in FIG. 2 is used.
For the water absorption rate, as shown in FIG. 2, a sample having a hollow shape for test 100 is cut to about 50 mm and the weight is measured. The sample is immersed in distilled water at 23 ° C. so that the upper end thereof is at a depth of about 50 mm from the water surface, the pressure is reduced to 17 kPa and the mixture is left for 5 minutes, then returned to normal pressure and left as it is for 3 minutes. Then, take the sample out of the water, carefully wipe off the water droplets on the surface, and weigh it.
Water absorption rate = (W1-W0) / W0 × 100
W0: Weight before the test (g)
W1: Weight after test (g)
The compression set (CS) is obtained by compressing a sample (length 100 mm) of a hollow shape 100 for testing as shown in FIG. 2 by 50% of its height and treating it at 70 ° C. × 200 hr, before and after the treatment. It is a numerical value of the comparison of heights. The height after the treatment is measured after 30 minutes have passed in an atmosphere of 23 ° C. by releasing the compression immediately after the treatment at 70 ° C. × 200 hr.
Compressive permanent strain (CS) = (t0-t1) / (t0-ts) × 100
t0: Height before processing (mm)
t1: Height after processing (mm)
ts: 50% height of t0 (mm)
The tensile test (50% modulus, 100% modulus, breaking strength, breaking elongation) was in accordance with JIS K6251, and the test piece was taken from a sample of hollow shape 100 for testing.

Figure 0007064336000003
Figure 0007064336000003

表3にあるとおり、従来品の圧縮永久歪みが31%に対して、発明品は24%と低い値を示した。 As shown in Table 3, the compression set of the conventional product was 31%, while that of the invention product was as low as 24%.

なお、本実施形態では、サイドドア1の周縁に沿って取付けられ、ボディ2側のドア開口周縁に弾接するドアウェザーストリップ20を例に説明したが、自動車のバックドア,トランクリッド,フード等の開閉体に取付けられるドアオープニングシール,トランク用ウェザーストリップなどのウェザーストリップなど、どのようなウェザーストリップにも適用可能である。 In the present embodiment, the door weather strip 20 which is attached along the peripheral edge of the side door 1 and is in contact with the peripheral edge of the door opening on the body 2 side has been described as an example. It can be applied to any weatherstrip, such as door opening seals attached to closures and weatherstrips such as weatherstrips for trunks.

また、中空形状のシール部の実施例を示したが、リップ形状も同様である。 Moreover, although the embodiment of the hollow-shaped seal portion is shown, the lip shape is also the same.

1 サイドドア
1a 枠体
2 ボディ
10 ウェザーストリップ
11 取付基部
12 中空シール部
20 ウェザーストリップ
21 取付基部
22 中空シール部
50 速度計
100 試験用中空形状
1 Side door 1a Frame 2 Body 10 Weatherstrip 11 Mounting base 12 Hollow seal 20 Weatherstrip 21 Mounting base 22 Hollow seal 50 Speedometer 100 Hollow shape for testing

Claims (3)

車両の開閉体周縁又は開口周縁に取付けられる取付基部と、前記取付基部に一体成形され前記開閉体の閉時に前記車両のボディ側の開閉体開口周縁又は開閉体周縁に弾接するシール部を備えたウェザーストリップであって、
前記シール部を、比重を0.35以上0.65以下とし、損失弾性率を0.25MPa以下のゴム様弾性体からなるスポンジ材で構成したことを特徴とするウェザーストリップ。
It is provided with a mounting base that is attached to the peripheral edge of the opening / closing body or the peripheral edge of the opening / closing of the vehicle, and a sealing portion that is integrally molded with the mounting base and that is elastically contacted with the opening / closing peripheral edge of the opening / closing body or the peripheral edge of the opening / closing body on the body side of the vehicle when the opening / closing body is closed. It ’s a weatherstrip,
A weather strip characterized in that the sealing portion is made of a sponge material made of a rubber-like elastic body having a specific gravity of 0.35 or more and 0.65 or less and a loss elastic modulus of 0.25 MPa or less.
前記シール部を、比重を0.35以上0.65以下とし、前記損失弾性率を0.20MPa以下のスポンジ材で構成したことを特徴とする請求項1に記載のウェザーストリップ。 The weather strip according to claim 1, wherein the sealing portion is made of a sponge material having a specific gravity of 0.35 or more and 0.65 or less and a loss elastic modulus of 0.20 MPa or less. 前記シール部は中空シール部であり、圧縮永久歪み(70℃×200hr)が25%以下であることを特徴とする請求項1又は2に記載のウェザーストリップ。 The weather strip according to claim 1 or 2, wherein the sealing portion is a hollow sealing portion and has a compression set (70 ° C. × 200 hr) of 25% or less.
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