JP4533709B2 - Shock absorbing structure and manufacturing method of shock absorbing structure - Google Patents

Shock absorbing structure and manufacturing method of shock absorbing structure Download PDF

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JP4533709B2
JP4533709B2 JP2004273208A JP2004273208A JP4533709B2 JP 4533709 B2 JP4533709 B2 JP 4533709B2 JP 2004273208 A JP2004273208 A JP 2004273208A JP 2004273208 A JP2004273208 A JP 2004273208A JP 4533709 B2 JP4533709 B2 JP 4533709B2
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shock absorber
plate
absorbing structure
standing wall
shock
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JP2006088737A (en
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貴彦 谷口
潤仁 足立
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Hayashi Telempu Corp
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本発明は、自動車の乗員の足下において平坦部及び立壁部を有する車体パネルと、当該車体パネルの車室側に敷設される敷物と、の間に設置される衝撃吸収構造体および衝撃吸収構造体の製造方法に関する。 The present invention includes a vehicle body panel having a Oite flat portion and the vertical wall to the occupant of the feet of the motor vehicle, and rugs are laid on the cabin side of the vehicle body panel, the shock absorbing structure installed between and shock absorbing The present invention relates to a method for manufacturing a structure.

従来より、乗用車等の自動車のフロアパネル上にフロアカーペットを敷設することにより、内装材としての良好な意匠性や外観を確保している。また、フロア面の平滑性を得たり、騒音を吸収したりする目的で、フロアカーペットとフロアパネルとの間に各種の嵩上げ材を配設することが一般的である。このような目的のため、嵩上げ材には、多孔質で適度のクッション性を有する各種の繊維フェルト類が用いられている。   Conventionally, by laying a floor carpet on a floor panel of an automobile such as a passenger car, a good design and appearance as an interior material are secured. In addition, for the purpose of obtaining the smoothness of the floor surface and absorbing noise, it is common to arrange various raising materials between the floor carpet and the floor panel. For this purpose, various types of fiber felts that are porous and have appropriate cushioning properties are used for the raising material.

近年、自動車の衝突事故、特に前面衝突時を考慮し、前席に座っている乗員の足への衝撃を緩和して負担を軽減させることを目的として、フロアパネルとフロアカーペットとの間にティビアパッドと呼ばれる衝撃吸収体を配設することが行われている(例えば、特許文献1〜3)。このような衝撃吸収体としては、衝撃発生時の圧縮荷重に対してエネルギーを吸収する性能を有する必要があるため、ポリプロピレン樹脂やポリスチレン樹脂に発泡剤を添加してビーズ状に予備発泡させ、さらに成形型内で加熱して発泡させながら成形した、いわゆるビーズ発泡成形体が用いられることが多い。
特開平10−329762号公報 特開2003−118460号公報 特開2003−127796号公報
In recent years, taking into account car crashes, especially frontal crashes, a tibia pad is placed between the floor panel and the floor carpet in order to reduce the impact on the feet of passengers sitting in the front seats and reduce the burden. It is practiced to dispose a shock absorber called “K” (for example, Patent Documents 1 to 3). As such an impact absorber, it is necessary to have the ability to absorb energy against the compressive load at the time of impact occurrence. Therefore, a foaming agent is added to polypropylene resin or polystyrene resin to be pre-foamed into beads. In many cases, a so-called bead foam molded body that is molded while being heated and foamed in a mold is used.
Japanese Patent Laid-Open No. 10-329762 JP 2003-118460 A Japanese Patent Laid-Open No. 2003-127796

ビーズ発泡成形体を用いた衝撃吸収体では、フロアカーペットを介して狭い範囲に強い力が加えられると、その範囲に応力が集中し、当該範囲が圧縮されて塑性変形してしまうことがあった。例えば、乗員の踵の位置では局所的に強い圧縮力が加えられるため、圧縮されて反力の低下を招き、局所的に衝撃吸収性能が低下することがあった。また、衝撃吸収体を発泡成形して輸送したり、車両に組み付けたりする際、割れ、折れ、剥がれ等の破損が起きないよう、慎重に取り扱う必要があった。   In a shock absorber using a bead foam molded body, when a strong force is applied to a narrow range via a floor carpet, stress concentrates in the range and the range may be compressed and plastically deformed. . For example, since a strong compressive force is locally applied at the position of the occupant's heel, the reaction force may be reduced due to compression, and the shock absorbing performance may be locally reduced. Further, when the shock absorber is foamed and transported or assembled to a vehicle, it has been necessary to handle it carefully so as not to cause breakage such as cracking, folding, and peeling.

本発明は、自動車の乗員の足下において平坦部及び立壁部を有する車体パネルと、当該車体パネルの車室側に敷設される敷物と、の間に設置される衝撃吸収構造体において、良好な衝撃吸収性能を長期間維持することが可能であるとともに、輸送効率を向上させることが可能な衝撃吸収構造体および衝撃吸収構造体の製造方法の提供を目的とする。 The present invention provides a good impact in a shock absorbing structure installed between a vehicle body panel having a flat portion and a standing wall portion under the foot of an automobile occupant and a rug laid on the vehicle compartment side of the vehicle body panel. An object of the present invention is to provide an impact absorbing structure capable of maintaining the absorption performance for a long period of time and improving the transportation efficiency, and a method for manufacturing the impact absorbing structure.

上記目的を達成するため、本発明は、自動車の乗員の足下において平坦部及び立壁部を有する車体パネルと、当該車体パネルの車室側に敷設される敷物と、の間に設置される衝撃吸収構造体であって、発泡させた材質からなる衝撃吸収体に対して上記敷物に面する側に無発泡の板状部材が積層されて一体化された構造とされ、上記衝撃吸収体は、上記平坦部上に設置される衝撃吸収体平坦部と、上記立壁部上に設置される衝撃吸収体立壁部と、が別の部材にされ、上記無発泡の板状部材は、合成樹脂板からなるとともに、上記衝撃吸収体平坦部に一体化された板状部材平坦部と、上記衝撃吸収体立壁部に一体化された板状部材立壁部と、が折り曲げ動作可能に接続されていることを特徴とする。
すなわち、敷物を介して狭い範囲に強い力が加えられると、敷物に面する側に積層された無発泡の板状部材がその力を受け止める。ここで、板状部材は発泡させていない材質とされているので、狭い範囲の強い力を広い範囲で受け止める。すると、部分的に応力が集中することがなくなり、狭い範囲が圧縮されて塑性変形することがなくなる。これにより、部分的に強い圧縮力が加えられても部分的な圧縮を防いで反力を維持させ、良好な衝撃吸収性能を長期間維持することが可能な衝撃吸収構造体を提供することができる。また、発泡させた材質からなる衝撃吸収体に無発泡の板状部材が一体化されているので、良好な耐久性を有する。これにより、本衝撃吸収構造体を輸送したり、車両に組み付けたりする際、良好な歩留まりにすることができる。
さらに、本発明によれば、輸送時に、衝撃吸収構造体を二つ折りにしたり、衝撃吸収構造体を折り曲げずに平板状にしたりすることによって、荷姿が良くなり、輸送効率を向上させることが可能となる。
In order to achieve the above object, the present invention provides a shock absorber that is installed between a vehicle body panel having a flat portion and a standing wall portion under the foot of an occupant of an automobile and a rug laid on the vehicle compartment side of the vehicle body panel. The structure is a structure in which non-foamed plate-like members are laminated and integrated on the side facing the rug with respect to the shock absorber made of a foamed material, and the shock absorber is The shock absorber flat portion installed on the flat portion and the shock absorber vertical wall portion installed on the standing wall portion are separate members, and the non-foamed plate member is made of a synthetic resin plate. In addition, the plate-like member flat portion integrated with the shock absorber flat portion and the plate-like member standing wall portion integrated with the shock absorber standing wall portion are connected so as to be capable of bending operation. And
That is, when a strong force is applied to a narrow range through the rug, the non-foamed plate-like member laminated on the side facing the rug receives the force. Here, since the plate-like member is made of a material that is not foamed, a strong force in a narrow range is received in a wide range. As a result, stress is not partially concentrated, and a narrow range is not compressed and plastically deformed. Thus, even if a strong compressive force is applied partially, it is possible to provide a shock absorbing structure capable of preventing partial compression and maintaining a reaction force and maintaining good shock absorbing performance for a long period of time. it can. In addition, since the non-foamed plate-like member is integrated with the shock absorber made of the foamed material, it has good durability. Thereby, when transporting this shock absorption structure or assembling | attaching to a vehicle, it can be set as a favorable yield.
Furthermore, according to the present invention, the packaging can be improved and the transportation efficiency can be improved by folding the shock absorbing structure in half during transportation or by flattening the shock absorbing structure without folding it. It becomes possible.

乗員の足下の車体パネルは、フロアパネル、ダッシュボード下部、これらの組み合わせ、等が考えられる。上記敷物は、カーペット、マット、これらの組み合わせ、等が考えられる The body panel under the occupant's feet can be a floor panel, a lower part of the dashboard, a combination of these, and the like. The rug may be a carpet, a mat, a combination thereof, or the like .

上記衝撃吸収体は、合成樹脂を発泡させて筒状に形成した筒状樹脂粒子を多数集合させて成形した成形体とされている構成としてもよい。
衝撃吸収体をビーズ発泡成形体とすると、衝撃吸収体の表面で音波が反射するため、音は衝撃吸収体に吸音されない。その結果、車室内に入射するロードノイズやエンジンノイズ等の侵入音が衝撃吸収体の表面で反射して乗員の耳に入ってしまう。乗員室内の静粛性を向上させる観点から、衝撃吸収体に吸音性能が付加されると好適である。
本衝撃吸収構造体の衝撃吸収体は、発泡した各泡よりも大きな貫通穴が形成された筒状樹脂粒子を多数集合させた成形体とされているので、全体として多孔質に形成されている。車室内に入射した侵入音の音波が筒状樹脂粒子の穴内に取り込まれて乱反射することにより、侵入音のエネルギーが吸収され、吸音される。
The shock absorber may have a configuration in which a large number of cylindrical resin particles formed by foaming a synthetic resin into a cylindrical shape are aggregated and molded.
When the shock absorber is a bead foam molded body, sound waves are reflected on the surface of the shock absorber, so that no sound is absorbed by the shock absorber. As a result, intrusion sounds such as road noise and engine noise that enter the passenger compartment are reflected by the surface of the shock absorber and enter the passenger's ears. From the viewpoint of improving the quietness in the passenger compartment, it is preferable that sound absorbing performance is added to the shock absorber.
Since the shock absorber of the present shock absorbing structure is a molded body in which a large number of cylindrical resin particles having through holes larger than each foamed foam are formed, the whole is formed to be porous. . The sound wave of the intruding sound that enters the vehicle interior is taken into the hole of the cylindrical resin particles and diffusely reflected, whereby the energy of the intruding sound is absorbed and absorbed.

ここで、衝撃吸収体に発泡した各泡よりも大きな穴を多数形成すると、狭い範囲に強い力が加えられたときに、特にその範囲が圧縮されて塑性変形しやすくなる。また、衝撃吸収体を発泡成形して輸送したり、車両に組み付けたりする際、割れ、折れ、剥がれ等の破損が起きないよう、より慎重に取り扱う必要がある。本衝撃吸収構造体は筒状樹脂粒子を多数集合させて成形した衝撃吸収体に無発泡の板状部材が積層されて一体化されているので、敷物を介して狭い範囲に強い力が加えられても部分的に応力が集中せず、狭い範囲が圧縮されて塑性変形することがない。また、衝撃吸収体に無発泡の板状部材が一体化されているので、良好な耐久性を有する。従って、吸音性を良好にさせながら、良好な衝撃吸収性能を長期間維持することが可能となり、耐久性を向上させることが可能となる。
むろん、衝撃吸収体をビーズ状発泡成形体など、筒状樹脂粒子を集合させた成形体以外の発泡材質としても、吸音性能以外の点で本発明の効果が得られる。
Here, when a large number of holes larger than each foam foamed are formed in the shock absorber, when a strong force is applied to a narrow range, the range is particularly compressed and plastic deformation is likely to occur. In addition, when the shock absorber is foamed and transported or assembled to a vehicle, it is necessary to handle it more carefully so as not to cause breakage such as cracking, folding, and peeling. In this shock absorbing structure, a non-foamed plate-shaped member is laminated and integrated on a shock absorber formed by assembling a large number of cylindrical resin particles, so that a strong force is applied to a narrow range via a rug. However, stress is not partially concentrated, and a narrow range is not compressed and plastically deformed. Moreover, since the non-foamed plate-like member is integrated with the shock absorber, it has good durability. Therefore, it is possible to maintain good shock absorption performance for a long time while improving sound absorption, and it is possible to improve durability.
Of course, the effects of the present invention can be obtained in points other than the sound absorbing performance even when the shock absorber is a foamed material other than a molded body in which cylindrical resin particles are aggregated, such as a bead-shaped foamed molded body.

上記無発泡の板状部材には、上記衝撃吸収体側の面と上記敷物側の面とを貫通した貫通穴が複数形成されている構成としてもよい。すると、車室内に入射した侵入音の音波が板状部材の貫通穴から筒状樹脂粒子の穴内に入りやすくなるので、吸音性がさらに向上する。   The non-foamed plate-shaped member may have a configuration in which a plurality of through-holes penetrating the shock absorber side surface and the rug side surface are formed. Then, since the sound wave of the intruding sound that has entered the vehicle interior easily enters the hole of the cylindrical resin particle from the through hole of the plate-like member, the sound absorption is further improved.

上記乗員の足下における車体パネルが平坦な形状とされた平坦部と当該平坦部の前縁部から斜め上方に延出した立壁部とを有し、本衝撃吸収構造体は、上記平坦部上と上記立壁部上とに跨って設置されている構成としてもよい。この構成の発明によれば、衝撃発生時に乗員の足が立壁部に滑り上がったとしても本衝撃吸収構造体により足への衝撃を吸収することが可能となる。この場合、上記衝撃吸収体は、上記平坦部上に設置される衝撃吸収体平坦部と、上記立壁部上に設置されるとともに当該衝撃吸収体平坦部とは別の部材にされた衝撃吸収体立壁部と、から構成され、上記無発泡の板状部材は、上記衝撃吸収体平坦部に一体化された板状部材平坦部と、上記衝撃吸収体立壁部に一体化されるとともに同板状部材平坦部と折り曲げ動作可能に接続された板状部材立壁部と、から構成されている構成としてもよい。 The vehicle body panel under the occupant's feet has a flat portion having a flat shape and a standing wall portion extending obliquely upward from the front edge portion of the flat portion, and the shock absorbing structure is provided on the flat portion. It is good also as a structure installed ranging over the said standing wall part. According to the invention of this configuration, even if the occupant's foot slides up to the standing wall when an impact occurs, the impact absorbing structure can absorb the impact on the foot. In this case, the shock absorber, the shock absorber flat portion which is placed on the flat portion, and those the impact absorbing member flat portion together when it is placed on the vertical wall portion is a separate member The non-foamed plate-like member is integrated with the plate-like member flat portion integrated with the shock absorber flat portion and the shock absorber stand-up wall portion. It is good also as a structure comprised from the plate-shaped member flat part and the plate-shaped member standing wall part connected so that bending operation | movement was possible.

上記衝撃吸収体は、合成樹脂を発泡させて成形した成形体とされている構成としてもよい。衝撃発生時、敷物を介して衝撃吸収構造体から乗員の足へ衝撃が伝えられることになるが、剛性の比較的低い合成樹脂の発泡体が衝撃を吸収し、かつ、衝撃吸収構造体の敷物側とされた剛性の比較的低い合成樹脂板が乗員の足への衝撃を少なくさせる。 The shock absorber may be configured that is a molded body formed of synthetic resin by foaming. When an impact occurs, the impact is transmitted from the impact absorbing structure to the occupant's foot through the rug, but the synthetic resin foam with relatively low rigidity absorbs the impact, and the rug of the impact absorbing structure A synthetic resin plate with relatively low rigidity on the side reduces the impact on the occupant's foot.

ところで、請求項5にかかる衝撃吸収構造体の製造方法は、自動車の乗員の足下において平坦部及び立壁部を有する車体パネルと、当該車体パネルの車室側に敷設される敷物と、の間に設置され、同平坦部上に設置される衝撃吸収体平坦部と同立壁部上に設置される衝撃吸収体立壁部とから構成され発泡させた材質からなる衝撃吸収体に対して上記敷物に面する側に無発泡の板状部材が積層されて一体化された構造とされる衝撃吸収構造体の製造方法であって、上記無発泡の板状部材を、上記衝撃吸収体平坦部に一体化される板状部材平坦部と、上記衝撃吸収体立壁部に一体化される板状部材立壁部と、が折り曲げ動作可能に接続される合成樹脂板とし、上記衝撃吸収構造体の形状に合わせた型内に、上記衝撃吸収体平坦部と上記衝撃吸収体立壁部との境界に当該衝撃吸収体平坦部と当該衝撃吸収体立壁部とを別の部材にする耐熱性の仕切部材を入れ、熱可塑性樹脂を発泡させて形成した樹脂粒子を多数充填するとともに上記敷物に面する位置に上記合成樹脂板を入れた後、同型内を加熱して同樹脂粒子どうしを溶融させながら結着させて上記衝撃吸収体平坦部と上記衝撃吸収体立壁部とを形成させるとともに、上記板状部材平坦部を上記衝撃吸収体平坦部に結着させ、上記板状部材立壁部を上記衝撃吸収体立壁部に結着させることにより、上記衝撃吸収体平坦部に一体化された上記板状部材平坦部と上記衝撃吸収体立壁部に一体化された上記板状部材立壁部とが折り曲げ動作可能に接続された上記衝撃吸収構造体を製造することを特徴とする。むろん、請求項2〜請求項4に記載された構成を製造方法に対応させることも可能である。 By the way, the manufacturing method of the shock-absorbing structure according to claim 5 includes a vehicle body panel having a flat portion and a standing wall portion under the foot of an automobile occupant and a rug laid on the vehicle compartment side of the vehicle body panel. The above-mentioned rug is faced with respect to a shock absorber made of a foamed material composed of a shock absorber flat portion installed on the same flat portion and a shock absorber standing wall portion installed on the same wall portion. A non-foamed plate-like member is laminated on the side to be integrated to produce an impact absorbing structure, and the non-foamed plate-like member is integrated with the flat portion of the shock absorber. The plate-like member flat portion and the plate-like member standing wall portion integrated with the shock absorber standing wall portion are synthetic resin plates connected so as to be capable of bending operation, and are matched to the shape of the shock absorbing structure. In the mold, the shock absorber flat part and the shock absorber A heat-resistant partition member that separates the shock absorber flat part and the shock absorber standing wall part from the wall part is inserted and filled with a large number of resin particles formed by foaming a thermoplastic resin. After placing the synthetic resin plate at the position facing the rug, the inside of the mold is heated and bonded while melting the resin particles to form the shock absorber flat part and the shock absorber standing wall part In addition, the plate-like member flat portion is bonded to the shock absorber flat portion, and the plate-like member standing wall portion is bonded to the shock absorber standing wall portion, thereby being integrated with the shock absorber flat portion. The shock absorbing structure is manufactured in which the flat plate member flat portion and the plate member standing wall integrated with the shock absorber standing wall are connected so as to be capable of bending. Of course, it is also possible to make the structure described in claims 2 to 4 correspond to a manufacturing method.

ここで、上記樹脂粒子が上記熱可塑性樹脂を発泡させて筒状に形成した筒状樹脂粒子であり、上記型内に上記筒状樹脂粒子を多数充填するとともに上記敷物に面する位置に上記合成樹脂板を入れた後、同型内に水蒸気を導入して同型内を加熱して同筒状樹脂粒子どうしを溶融させながら結着させて衝撃吸収体を形成させるとともに同合成樹脂板を同衝撃吸収体に結着させることにより、上記衝撃吸収構造体を製造する構成としてもよい。筒状樹脂粒子を用いて衝撃吸収体を形成する場合、筒状樹脂粒子に貫通穴が形成されているので、型内に高温蒸気を導入することにより、容易に型内全体を加熱することができる。 Here, the resin particles are cylindrical resin particles formed in a cylindrical shape by foaming the thermoplastic resin, the synthesis in a position facing the rug to fill a large number of the tubular resin particles in the mold After inserting the resin plate , water vapor is introduced into the same mold and the inside of the same mold is heated to bind the cylindrical resin particles while melting them to form a shock absorber and to absorb the same synthetic resin plate. It is good also as a structure which manufactures the said impact-absorbing structure by making it bind | conclude to a body. When the shock absorber is formed using cylindrical resin particles, since the through holes are formed in the cylindrical resin particles, the entire mold can be easily heated by introducing high-temperature steam into the mold. it can.

また、無発泡の板状部材に衝撃吸収体側の面と敷物側の面とを貫通した貫通穴を複数形成すると、水蒸気が板状部材の貫通穴を通過するので、さらに容易に型内全体を加熱することができ、さらに容易に衝撃吸収構造体を形成することが可能となる。   In addition, if a plurality of through holes that penetrate the shock absorber side surface and the rug side surface are formed in the non-foamed plate-like member, water vapor passes through the through-holes of the plate-like member. It can be heated, and the shock absorbing structure can be formed more easily.

請求項1にかかる発明によれば、車体パネルと敷物との間に設置される衝撃吸収構造体において、良好な衝撃吸収性能を長期間維持することが可能であるとともに、輸送効率を向上させることが可能な衝撃吸収構造体を提供することができる。
請求項2にかかる発明では、吸音性を良好にさせながら、部分的に強い圧縮力が加えられても部分的な圧縮を防いで反力を維持させ、良好な衝撃吸収性能を長期間維持することが可能になるとともに、耐久性を向上させることが可能になる。
請求項3にかかる発明では、吸音性をさらに良好にさせることが可能となる。
According to the first aspect of the present invention, in the shock absorbing structure installed between the vehicle body panel and the rug, it is possible to maintain good shock absorbing performance for a long period of time and improve transportation efficiency. It is possible to provide a shock absorbing structure capable of satisfying the requirements.
In the invention according to claim 2, while making sound absorption good, even if a strong compressive force is applied partially, partial compression is prevented and reaction force is maintained, and good shock absorbing performance is maintained for a long time. And the durability can be improved.
In the invention concerning Claim 3, it becomes possible to make sound-absorbing property still more favorable.

請求項4にかかる発明では、衝撃発生時に乗員の足への衝撃を少なくさせる好適な構成を提供することができる。 In the invention concerning Claim 4 , the suitable structure which reduces the impact to a passenger | crew's leg at the time of an impact generation can be provided.

請求項5にかかる発明では、車体パネルと敷物との間に設置される衝撃吸収構造体において、良好な衝撃吸収性能を長期間維持することが可能であるとともに、輸送効率を向上させることが可能な衝撃吸収構造体を製造するのに好適な製造方法を提供することができる。
請求項6にかかる発明では、容易に型内全体を加熱することができるので、さらに容易に衝撃吸収構造体を形成することが可能となる。
In the invention according to claim 5, in the shock absorbing structure installed between the vehicle body panel and the rug, it is possible to maintain good shock absorbing performance for a long period of time and to improve transportation efficiency. A suitable manufacturing method for manufacturing a shock-absorbing structure can be provided.
In the invention according to the sixth aspect, since the entire mold can be easily heated, it is possible to form the shock absorbing structure more easily.

以下、下記の順序に従って本発明の実施の形態について説明する。
(1)衝撃吸収構造体の構成:
(2)衝撃吸収構造体の製造方法:
(3)衝撃吸収構造体の作用、効果:
(4)実施例:
(5)変形例:
Hereinafter, embodiments of the present invention will be described in the following order.
(1) Configuration of shock absorbing structure:
(2) Manufacturing method of shock absorbing structure:
(3) Action and effect of shock absorbing structure:
(4) Example:
(5) Modification:

(1)衝撃吸収構造体の構成:
図1は本発明の一実施形態にかかる衝撃吸収構造体10を設置した乗用自動車の要部を垂直断面にて示す要部断面図であり、図2は衝撃吸収構造体10の外観を示す斜視図である。図3は、衝撃吸収体12を形成するために多数用いられる筒状樹脂粒子(樹脂粒子)16の外観を示す斜視図である。
図1では、前後の座席を有する乗用自動車のフロアのうち前席乗員Mの足下部が示されている。自動車の乗員の足下において、金属製のフロアパネル20が車体パネルの一部として設けられ、このフロアパネル20の車室側にフロアカーペット(敷物)30が敷設されている。フロアパネル20は、前席乗員Mの足下から後方に向かって略水平に設けられた平坦な形状の平坦部22とされるとともに、この平坦部22の前縁部から前方に向かって斜め上方に立ち上がってエンジンルームとの境界を形成する立壁部24とされている。フロアカーペット30は、このフロアパネル20の形状に合わせて、前席乗員Mの足下から後方に向かって略水平に設けられるとともに、前席乗員Mの足下から前方に向かって斜め上方に立ち上がって設けられている。本発明の衝撃吸収構造体10は、フロアパネル20とフロアカーペット30との間で、フロアパネルの平坦部22上と立壁部24上とに跨って設置されている。
(1) Configuration of shock absorbing structure:
FIG. 1 is a cross-sectional view showing a main part of a passenger car provided with a shock absorbing structure 10 according to an embodiment of the present invention in a vertical cross section, and FIG. 2 is a perspective view showing an appearance of the shock absorbing structure 10. FIG. FIG. 3 is a perspective view showing the appearance of cylindrical resin particles (resin particles) 16 that are used in large numbers to form the shock absorber 12.
In FIG. 1, a lower leg portion of a front seat occupant M is shown on the floor of a passenger car having front and rear seats. A metal floor panel 20 is provided as a part of a vehicle body panel at the foot of an occupant of an automobile, and a floor carpet (rug) 30 is laid on the passenger compartment side of the floor panel 20. The floor panel 20 is a flat portion 22 having a flat shape provided substantially horizontally from the feet of the front seat occupant M toward the rear, and obliquely upward from the front edge of the flat portion 22 toward the front. It is set as the standing wall part 24 which stands | starts up and forms a boundary with an engine room. The floor carpet 30 is provided substantially horizontally from the feet of the front seat occupant M to the rear in accordance with the shape of the floor panel 20, and is provided to rise obliquely upward from the feet of the front seat occupant M to the front. It has been. The shock absorbing structure 10 of the present invention is installed between the floor panel 20 and the floor carpet 30 so as to straddle the flat portion 22 and the standing wall portion 24 of the floor panel.

フロアカーペット30は、意匠性、吸音性、遮音性などを主な目的として、乗員室のフロア全体を覆ってフロアパネルの平坦部22と立壁部24との外形に沿うように成形されてフロアパネル20上に敷設される。フロアカーペット30は、基布に立毛パイルを組織したタフトカーペットや、不織ウェブをニードリングして繊維相互を絡め形成したニードルパンチカーペット等が用いられる。フロアカーペット30の裏面には低密度ポリエチレン、エチレン酢酸ビニル等の低融点の熱可塑性樹脂からなる薄いシートが裏打ちされる。この裏打ちを加熱、可塑化させた状態で所要の形状にプレス成形することにより、自動車のフロアパネル20に沿う形状に賦形される。   The floor carpet 30 is formed so as to cover the entire floor of the passenger compartment and conform to the outer shape of the flat portion 22 and the standing wall portion 24 for the main purpose of design, sound absorption, and sound insulation. 20 is laid. As the floor carpet 30, a tuft carpet in which napped piles are organized on a base fabric, a needle punch carpet in which fibers are entangled by needling a nonwoven web, or the like is used. The back surface of the floor carpet 30 is lined with a thin sheet made of a low melting point thermoplastic resin such as low density polyethylene or ethylene vinyl acetate. The backing is heated and plasticized, and is press-molded into a required shape, thereby forming the shape along the floor panel 20 of the automobile.

自動車の前面衝突時、自動車内の前席乗員Mの足下となるフロアパネルの平坦部22と立壁部24との境界部26には、斜め上後方に突き上げられる強い衝撃が加わり、乗員Mの足へ大きな衝撃荷重が加わることになる。そこで、境界部26に、フロアパネル20とフロアカーペット30との間にティビアパッドと呼ばれる衝撃を吸収する材料を配設している。本発明では、ティビアパッドとして、発泡させた材質からなる衝撃吸収体12に対してフロアカーペット30に面する側に無発泡の樹脂プレート(無発泡の板状部材)14が積層されて一体化された構造とされた衝撃吸収構造体10を用いる。これにより、衝撃発生時に乗員Mの足が立壁部24に跳ね上がったとしても衝撃吸収構造体10により足への衝撃を吸収することが可能となる。
上記衝撃吸収構造体10は、自動車乗員室の運転席の足下と助手席の足下の少なくとも一方へと配設される。むろん、運転席の足下から助手席の足下にかけて単一の衝撃吸収構造体を設置してもよい。
At the time of a frontal collision of the automobile, a strong impact thrusting upward and rearward is applied to the boundary portion 26 between the flat portion 22 and the standing wall portion 24 of the floor panel, which is a foot of the front seat occupant M in the automobile, A large impact load is applied. Therefore, a material that absorbs an impact called a tibia pad is disposed in the boundary portion 26 between the floor panel 20 and the floor carpet 30. In the present invention, as the tibia pad, a non-foamed resin plate (non-foamed plate-like member) 14 is laminated and integrated on the side facing the floor carpet 30 with respect to the shock absorber 12 made of a foamed material. The shock absorbing structure 10 having a structure is used. As a result, even if the foot of the occupant M jumps up to the standing wall portion 24 when an impact occurs, the impact absorbing structure 10 can absorb the impact on the foot.
The shock absorbing structure 10 is disposed on at least one of the feet of the driver's seat and the passenger's seat of the automobile passenger compartment. Of course, a single shock absorbing structure may be installed from the driver's seat to the passenger's seat.

衝撃吸収体12としては、衝撃を吸収する観点から発泡させた材質が好ましく、合成樹脂を発泡させた材質がさらに好ましい。衝撃発生時、フロアカーペット30を介して衝撃吸収構造体10から乗員の足へ衝撃が伝えられることになるが、剛性の比較的低い合成樹脂の発泡体が衝撃を吸収するので、乗員の足への衝撃を少なくさせることができる。発泡させる合成樹脂としては、成形の容易性から熱可塑性樹脂が好ましく、ポリプロピレン、ポリスチレン、ポリエチレン、等を用いることができる。また、衝撃吸収体の形状に成形する際には、プラスチックに発泡剤を混合して発泡させた発泡プラスチックを所定のダイから押し出して成形してもよいし、ビーズ状のプラスチックに発泡剤を含浸させて予備発泡させた後に金型内に充填してさらに加熱発泡させて成形してもよい。発泡剤としては、ブタンやペンタン等の炭化水素を発生させる揮発性発泡剤、炭酸アンモニウム等の炭酸ガス等を発生させる無機系発泡剤、等を用いることができる。   The shock absorber 12 is preferably a foamed material from the viewpoint of absorbing the impact, and more preferably a synthetic resin foamed material. When an impact occurs, the impact is transmitted from the shock absorbing structure 10 to the occupant's foot via the floor carpet 30, but a synthetic resin foam having a relatively low rigidity absorbs the impact, so that the occupant's foot is absorbed. Can reduce the impact. As the synthetic resin to be foamed, a thermoplastic resin is preferable from the viewpoint of easy molding, and polypropylene, polystyrene, polyethylene, and the like can be used. Also, when molding into the shape of the shock absorber, the foamed plastic obtained by mixing the foaming agent with the plastic may be extruded from a predetermined die, or the beaded plastic is impregnated with the foaming agent. Then, after pre-foaming, it may be filled in a mold and further heated and foamed for molding. As the foaming agent, volatile foaming agents that generate hydrocarbons such as butane and pentane, inorganic foaming agents that generate carbon dioxide gas such as ammonium carbonate, and the like can be used.

ところで、車室内にはロードノイズやエンジンノイズ等が入射するが、衝撃吸収体を発泡プラスチックのビーズ発泡成形体とすると、衝撃吸収体の表面で音波が反射してしまうため、ロードノイズやエンジンノイズ等の侵入音は衝撃吸収体に吸音されない。乗員室内の静粛性を良好にさせる観点から、侵入音が衝撃吸収体に吸音されると好適である。
検討を進めた結果、図3に示すように、合成樹脂を発泡させて筒状に形成した筒状樹脂粒子16を多数集合させて成形して衝撃吸収体とすると、良好な吸音性が得られることが分かった。
By the way, road noise, engine noise, etc. enter the passenger compartment, but if the shock absorber is made of foamed plastic bead foam, the sound wave will be reflected on the surface of the shock absorber, so road noise and engine noise. Such an intrusion sound is not absorbed by the shock absorber. From the viewpoint of improving the quietness in the passenger compartment, it is preferable that the intrusion sound is absorbed by the shock absorber.
As a result of study, as shown in FIG. 3, when a large number of cylindrical resin particles 16 formed by foaming a synthetic resin and assembled into a cylindrical shape are assembled and molded into an impact absorber, good sound absorption is obtained. I understood that.

個々の筒状樹脂粒子16は、合成樹脂に発泡剤を添加して発泡させながら筒形状に成形することにより得られる。発泡させる合成樹脂としては、成形の容易性から熱可塑性樹脂が好ましく、ポリプロピレン、ポリスチレン、ポリエチレン、等を用いることができる。例えば、熱可塑性樹脂に発泡剤を混合して発泡させた熱可塑性樹脂を環状の押出口を有するダイから筒状に押し出して所定の長さに切断して成形することにより、筒状樹脂粒子を形成することができる。発泡剤としては、上述した揮発性発泡剤や無機系発泡剤等を用いることができる。
筒状樹脂粒子16は発泡した各泡よりも大きな貫通穴16aが形成されているので、同筒状樹脂粒子を用いて形成した衝撃吸収体は、全体として多孔質に形成されている。車室内に入射した侵入音の音波が筒状樹脂粒子の貫通穴16a内に入って乱反射することにより、侵入音のエネルギーが衝撃吸収体に吸収され、吸音される。
The individual cylindrical resin particles 16 are obtained by adding a foaming agent to a synthetic resin and molding it into a cylindrical shape while foaming. As the synthetic resin to be foamed, a thermoplastic resin is preferable from the viewpoint of easy molding, and polypropylene, polystyrene, polyethylene, and the like can be used. For example, a cylindrical resin particle is obtained by extruding a thermoplastic resin obtained by mixing a foaming agent with a thermoplastic resin into a cylindrical shape from a die having an annular extrusion port, cutting it into a predetermined length, and molding it. Can be formed. As the foaming agent, the above-described volatile foaming agent, inorganic foaming agent, or the like can be used.
Since the cylindrical resin particles 16 are formed with through holes 16a larger than the foamed bubbles, the shock absorber formed using the cylindrical resin particles is formed to be porous as a whole. The sound waves of the intruding sound entering the vehicle compartment enter the through holes 16a of the cylindrical resin particles and diffusely reflect, whereby the energy of the intruding sound is absorbed by the shock absorber and absorbed.

筒状樹脂粒子16は、内径dを2〜4mm、外径D(D>d)を4〜6mm、長さLを3〜6mmとした、円筒形状としている。これらのパラメータは、衝撃吸収体の衝撃吸収性能と吸音性能に影響を与えるパラメータであり、内径d、外径D、長さLをこれらの範囲内とすることにより、衝撃吸収体に良好な衝撃吸収性能と良好な吸音性能が付与される。このような筒状樹脂粒子として、株式会社ジェイエスピー製のPEPP(ポーラスEPP)を用いることができる。むろん、筒状樹脂粒子は、円筒形状以外にも、断面が略楕円と偏平化された形状などとしてもよい。
筒状樹脂粒子16を多数用いて衝撃吸収体を形成する際には、衝撃吸収体の形状に合わせた所定の型内に筒状樹脂粒子16を多数充填した後、同型内に高温水蒸気を導入して同型内を加熱して筒状樹脂粒子16どうしを溶融させながら結着させることにより、衝撃吸収体を形成することができる。
The cylindrical resin particles 16 have a cylindrical shape with an inner diameter d of 2 to 4 mm, an outer diameter D (D> d) of 4 to 6 mm, and a length L of 3 to 6 mm. These parameters affect the shock absorbing performance and sound absorbing performance of the shock absorber. By setting the inner diameter d, the outer diameter D, and the length L within these ranges, a good shock is applied to the shock absorber. Absorption performance and good sound absorption performance are imparted. As such cylindrical resin particles, PEPP (porous EPP) manufactured by GS Corporation can be used. Needless to say, the cylindrical resin particles may have a shape in which the cross section is flattened to be substantially elliptical in addition to the cylindrical shape.
When forming a shock absorber using a large number of cylindrical resin particles 16, after filling a large number of cylindrical resin particles 16 into a predetermined mold that matches the shape of the shock absorber, high-temperature steam is introduced into the mold. Then, the shock absorber can be formed by heating the inside of the same mold and binding the cylindrical resin particles 16 while melting them.

衝撃吸収体は、密度0.02〜0.1g/cm3、厚さ10〜50mmが好ましい。密度0.02g/cm3未満では十分な反力が得られず、エネルギー吸収量が減少するため、衝撃吸収体が底付き、最終的に過大な反力が発生してしまう。一方、密度が0.1g/cm3より大きい場合、エネルギー吸収量は大きいが、初期段階から過大な反力が発生してしまう。また、吸音性も良好でない。厚さを10mm以上にすると衝撃吸収体に衝撃が加えられたときに十分な衝撃吸収性能が得られる。
発泡ポリプロピレンを内径2〜4mm、外径4〜6mm、長さ3〜6mmに成形した筒状樹脂粒子を多数集合させて成形して衝撃吸収体を得た場合、得られた衝撃吸収体の密度は0.03〜0.05g/cm3となる。
The impact absorber preferably has a density of 0.02 to 0.1 g / cm 3 and a thickness of 10 to 50 mm. If the density is less than 0.02 g / cm 3 , a sufficient reaction force cannot be obtained, and the amount of energy absorption is reduced, so that the shock absorber bottoms out and an excessive reaction force is finally generated. On the other hand, when the density is larger than 0.1 g / cm 3 , the energy absorption amount is large, but an excessive reaction force is generated from the initial stage. Also, the sound absorption is not good. When the thickness is 10 mm or more, sufficient shock absorbing performance can be obtained when an impact is applied to the shock absorber.
When an impact absorber is obtained by assembling and molding a large number of cylindrical resin particles formed of foamed polypropylene having an inner diameter of 2 to 4 mm, an outer diameter of 4 to 6 mm, and a length of 3 to 6 mm, the density of the obtained impact absorber Becomes 0.03 to 0.05 g / cm 3 .

無発泡の板状部材14は、樹脂製プレート、金属製プレート、硬質繊維成形プレート等の支持プレートが考えられるが、衝撃発生時に乗員の足への衝撃を少なくさせる観点から、合成樹脂板やハードフェルト等のフェルト等が好ましい。すると、衝撃発生時に剛性が比較的低くされた板状部材14が衝撃を吸収するので、乗員の足への衝撃を少なくさせることができる。板状部材に用いる合成樹脂としては、ポリプロピレン、ポリスチレン、ポリエチレン、等の熱可塑性樹脂や、フェノール樹脂、ユリア樹脂等の熱硬化性樹脂等を用いることができる。特にポリプロピレン板は、成形が容易であり、加工が容易であり、安価である点で、好適な合成樹脂板である。   The non-foamed plate-like member 14 may be a support plate such as a resin plate, a metal plate, or a hard fiber molded plate. From the viewpoint of reducing the impact on the occupant's foot when an impact occurs, a synthetic resin plate or a hard plate is used. Felts such as felt are preferred. Then, since the plate-like member 14 having a relatively low rigidity absorbs the impact when the impact occurs, the impact on the occupant's foot can be reduced. As the synthetic resin used for the plate-like member, thermoplastic resins such as polypropylene, polystyrene, and polyethylene, thermosetting resins such as phenol resin and urea resin, and the like can be used. In particular, a polypropylene plate is a suitable synthetic resin plate in that it is easy to mold, easy to process, and inexpensive.

無発泡の板状部材14を衝撃吸収体に貼付してサンプルとした3点曲げ試験(JIS K7221−1995に指定される加圧くさび、支持台を使用し、支点間距離を50mm、曲げ速度を50mm/min、加圧くさびの加圧方向に対する垂直面におけるサンプルサイズを50×150mmとする)を行って得られる曲げ弾性勾配が1〜75N/cmとなるように無発泡の板状部材を選定すると、衝撃発生時に乗員の足への衝撃を十分に少なくさせることができる。同曲げ弾性勾配を1N/cm以上にすると、衝撃発生時に衝撃が衝撃吸収構造体に十分に吸収されて乗員足首への負荷を十分に少なくさせ、また、衝撃吸収体に部分的に強い圧縮力が加えられたときに十分に大きな反力が得られて圧縮を十分に少なくさせる。同曲げ弾性勾配を75N/cm以下にすると、衝撃発生時に板状部材14からの反発を十分に少なくさせ、乗員足首への負荷を十分に少なくさせる。
例えば、無発泡の板状部材としてポリプロピレン板を用いる場合、厚さを0.3〜1.3mmとしている。厚さを0.3mm以上にすると、衝撃発生時に衝撃が衝撃吸収構造体に十分に吸収されて乗員足首への負荷を十分に少なくさせる。厚さを1.3mm以下にすると、衝撃発生時に板状部材14からの反発を十分に少なくさせ、乗員足首への負荷を十分に少なくさせる。
A three-point bending test using a non-foamed plate-like member 14 affixed to an impact absorber (using a pressure wedge and a support base specified in JIS K7221-1995, a distance between fulcrums of 50 mm, and a bending speed The non-foamed plate-like member is selected so that the bending elastic gradient obtained by carrying out 50 mm / min and the sample size on the surface perpendicular to the pressing direction of the pressing wedge is 50 × 150 mm) is 1 to 75 N / cm Then, it is possible to sufficiently reduce the impact on the occupant's foot when the impact occurs. If the bending elastic gradient is 1 N / cm or more, the shock is sufficiently absorbed by the shock absorbing structure when the shock is generated, and the load on the occupant's ankle is sufficiently reduced. When is applied, a sufficiently large reaction force is obtained to reduce the compression sufficiently. When the bending elastic gradient is 75 N / cm or less, the repulsion from the plate-like member 14 is sufficiently reduced when an impact is generated, and the load on the passenger ankle is sufficiently reduced.
For example, when a polypropylene plate is used as the non-foamed plate-like member, the thickness is set to 0.3 to 1.3 mm. When the thickness is 0.3 mm or more, the impact is sufficiently absorbed by the impact absorbing structure when the impact occurs, and the load on the occupant ankle is sufficiently reduced. When the thickness is 1.3 mm or less, the repulsion from the plate-like member 14 is sufficiently reduced when an impact is generated, and the load on the passenger ankle is sufficiently reduced.

板状部材14を衝撃吸収体12に積層して一体化するには、例えば、接着剤を板状部材と衝撃吸収体の少なくとも一方に塗布して両部材12,14を互いに接着すれば一体化することができるし、両面テープを板状部材と衝撃吸収体の少なくとも一方に貼付して両部材12,14を互いに貼着すれば一体化することができる。本実施形態では、射出成形等により無発泡の板状部材14を別成形し、衝撃吸収構造体の形状に合わせた所定の型内に筒状樹脂粒子16を多数充填するとともにフロアカーペット30に面する位置に板状部材14を入れた後、同型内を加熱して衝撃吸収構造体10を形成することにしている。以下、衝撃吸収構造体の製造方法を説明する。   In order to stack and integrate the plate-like member 14 on the shock absorber 12, for example, the adhesive is applied to at least one of the plate-like member and the shock absorber and the members 12 and 14 are bonded to each other. They can be integrated by sticking a double-sided tape to at least one of the plate-like member and the shock absorber and sticking the members 12 and 14 together. In this embodiment, a non-foamed plate-like member 14 is separately formed by injection molding or the like, and a large number of cylindrical resin particles 16 are filled in a predetermined mold that matches the shape of the shock absorbing structure, and the floor carpet 30 is faced. After the plate-like member 14 is placed at a position where the impact is to be absorbed, the inside of the mold is heated to form the shock absorbing structure 10. Hereinafter, a method for manufacturing the shock absorbing structure will be described.

(2)衝撃吸収構造体の製造方法:
図4は、衝撃吸収構造体を製造する過程を示す流れ図である。
無発泡の板状部材14については、種々の公知技術を用いて形成可能である。例えば、ポリプロピレン等の熱可塑性樹脂の粒状原反を加熱機付き射出成形機に供給し、原反を加熱機にて加熱して溶融させ、板状部材14の形状とされた所定の金型内に溶融状態の熱可塑性樹脂を射出して成形し、同金型を冷却して樹脂を固化させることにより、板状部材14を形成することができる。熱硬化性樹脂を用いて板状部材14を形成する場合には、液状の熱硬化性樹脂を所定の金型内に射出した後に同金型を加熱して樹脂を硬化させることにより、あるいは、液状の熱硬化性樹脂に硬化剤を添加して金型内に射出した後所定時間経過させて樹脂を硬化させることにより、形成可能である。むろん、押出成形やプレス成形等によっても板状部材14を形成可能である。
(2) Manufacturing method of shock absorbing structure:
FIG. 4 is a flowchart showing a process of manufacturing the shock absorbing structure.
The non-foamed plate-like member 14 can be formed using various known techniques. For example, a granular raw material of a thermoplastic resin such as polypropylene is supplied to an injection molding machine with a heater, and the raw material is heated and melted by a heater to form a plate-like member 14 in a predetermined mold. The plate-like member 14 can be formed by injecting and molding a molten thermoplastic resin to cool the mold and solidifying the resin. When forming the plate-like member 14 using a thermosetting resin, by injecting a liquid thermosetting resin into a predetermined mold and then heating the mold to cure the resin, or It can be formed by adding a curing agent to a liquid thermosetting resin and injecting it into the mold and then curing the resin after a predetermined time. Of course, the plate-like member 14 can also be formed by extrusion molding or press molding.

筒状樹脂粒子16についても、種々の公知技術を用いて形成可能である。
例えば、加熱機付き混練押出成形機にポリプロピレン等の熱可塑性樹脂を供給して加熱機にて加熱して樹脂を溶融させ、押出機にて溶融樹脂を押し出して、まず、十分に小さい径のそろった粒(ペレット)を得る。次に、得られた多数の粒をオートクレーブに投入し、所定の圧力、温度雰囲気下で所定量の発泡剤を含浸させる。そして、多数の粒を常圧下に取り出すことによって、発泡状態の筒状樹脂粒子を多数形成することができる。
The cylindrical resin particles 16 can also be formed using various known techniques.
For example, a thermoplastic resin such as polypropylene is supplied to a kneading extruder with a heater and heated with a heater to melt the resin, and the molten resin is extruded with an extruder. Grains (pellets) are obtained. Next, the obtained many grains are put into an autoclave and impregnated with a predetermined amount of a foaming agent under a predetermined pressure and temperature atmosphere. And many cylindrical resin particles of a foamed state can be formed by taking out many grains under normal pressure.

発泡させていない板状部材14と多数の発泡させた筒状樹脂粒子16とを準備すると、複数の蒸気孔を有するとともに衝撃吸収構造体10の形状に合わせた型42内に、筒状樹脂粒子16を多数充填するとともにフロアカーペット30に面する位置に板状部材14を入れ、型締めする。ここで、型42の蒸気孔は、筒状樹脂粒子の外径と長さの短い方よりも小さくしてある。従って、筒状樹脂粒子は、型42内に充填されたときに蒸気孔から外へ出ない。次に、筒状樹脂粒子16を構成する熱可塑性樹脂を加熱溶融させる温度にまで所定の加熱機により温度を上昇させた水蒸気を型42内に導入する。すると、型42内を加熱することができ、筒状樹脂粒子16をさらに発泡させながら筒状樹脂粒子16どうしを溶融させながら結着させて衝撃吸収体を形成させるとともに、板状部材14を衝撃吸収体12に結着させる。型42内を冷却した後、型を開くと、形成された衝撃吸収構造体を取り出すことができる。これにより、衝撃吸収体12に対してフロアカーペット30に面する側に無発泡の板状部材14が積層されて一体化された衝撃吸収構造体10が製造される。
ここで、筒状樹脂粒子には貫通穴が形成されているので、型内に高温水蒸気を導入することにより、容易に型内全体が加熱され、容易に衝撃吸収構造体を形成することができる。そして、衝撃吸収体と板状部材を接着剤により接着させたり両面テープにより貼着させたりする作業を行う必要が無くなるので、衝撃吸収構造体の製造コストをより低減させることができる。また、衝撃吸収体から板状部材が剥がれることも無い。
When the non-foamed plate-like member 14 and a large number of foamed cylindrical resin particles 16 are prepared, the cylindrical resin particles are placed in a mold 42 having a plurality of vapor holes and matching the shape of the shock absorbing structure 10. A plate member 14 is placed in a position facing the floor carpet 30 and filled with a large number of 16 and clamped. Here, the vapor holes of the mold 42 are made smaller than the shorter outer diameter and length of the cylindrical resin particles. Therefore, the cylindrical resin particles do not go out of the vapor hole when the mold 42 is filled. Next, water vapor whose temperature has been raised by a predetermined heater to a temperature at which the thermoplastic resin constituting the cylindrical resin particles 16 is heated and melted is introduced into the mold 42. Then, the inside of the mold 42 can be heated, and while the cylindrical resin particles 16 are further foamed, the cylindrical resin particles 16 are melted and bonded to form an impact absorber, and the plate member 14 is impacted. It binds to the absorbent body 12. When the mold 42 is opened after the mold 42 is cooled, the formed shock absorbing structure can be taken out. Thereby, the shock absorbing structure 10 in which the non-foamed plate-like member 14 is laminated and integrated on the side facing the floor carpet 30 with respect to the shock absorbing body 12 is manufactured.
Here, since the through holes are formed in the cylindrical resin particles, the entire interior of the mold is easily heated by introducing high-temperature steam into the mold, and an impact absorbing structure can be easily formed. . And since it becomes unnecessary to perform the operation | work which adhere | attaches an impact-absorbing body and a plate-shaped member with an adhesive agent, or sticks it with a double-sided tape, the manufacturing cost of an impact-absorbing structure can be reduced more. Further, the plate member is not peeled off from the shock absorber.

(3)衝撃吸収構造体の作用、効果:
以下、図1〜図3を参照して、本衝撃吸収構造体の作用、効果を説明する。
フロアカーペット30を介して狭い範囲に強い力が加えられるとフロアカーペット30に面する側に積層された板状部材14がその力を受け止める。同板状部材14は発泡させていない材質とされているので、狭い範囲の強い力を広い範囲で受け止める。すると、部分的に応力が集中することがなくなり、狭い範囲が圧縮されて塑性変形することがなくなる。特に乗員Mがハイヒールを履いていると衝撃吸収構造体においてハイヒールの踵が位置する部分では局所的に応力が集中することになるが、このような場合であっても無発泡の板状部材によって衝撃吸収体への応力が分散させられるため、衝撃吸収体は塑性変形しにくい。そして、塑性変形していない衝撃吸収体全体で衝撃荷重を吸収するため、良好な衝撃吸収性を有する。これにより、部分的に強い圧縮力が加えられても部分的な圧縮を防いで反力を維持させ、良好な衝撃吸収性能を長期間維持することが可能となる。
また、衝撃吸収構造体が発泡させた材質からなる衝撃吸収体に無発泡の板状部材が一体化された構造とされているので、割れ、折れ、剥がれ等の破損が生じにくく、耐久性が良好とされている。これにより、本衝撃吸収構造体を輸送したり、車両に組み付けたりする際、良好な歩留まりにすることができる。
(3) Action and effect of shock absorbing structure:
Hereinafter, with reference to FIGS. 1-3, the effect | action and effect of this shock absorption structure are demonstrated.
When a strong force is applied to a narrow range via the floor carpet 30, the plate-like member 14 laminated on the side facing the floor carpet 30 receives the force. Since the plate-like member 14 is made of a material that is not foamed, it receives a strong force in a narrow range in a wide range. As a result, stress is not partially concentrated, and a narrow range is not compressed and plastically deformed. In particular, when the occupant M is wearing high heels, the stress is locally concentrated in the portion where the heel of the high heel is located in the shock absorbing structure. Even in such a case, the non-foamed plate-like member Since the stress to the shock absorber is dispersed, the shock absorber is hardly plastically deformed. And since the impact load is absorbed in the whole impact-absorbing body which is not plastically deformed, it has favorable impact-absorbing property. Thereby, even if a strong compressive force is applied partially, it is possible to prevent partial compression and maintain the reaction force, and to maintain good shock absorption performance for a long period of time.
In addition, since the non-foamed plate-like member is integrated with the shock absorber made of the foamed material of the shock absorbing structure, it is difficult to cause breakage such as cracking, bending, peeling, and durability. It is considered good. Thereby, when transporting this shock absorption structure or assembling | attaching to a vehicle, it can be set as a favorable yield.

さらに、衝撃吸収体を筒状樹脂粒子を多数集合させて成形した成形体としても、衝撃吸収体に無発泡の板状部材が積層されて一体化されているので、フロアカーペット物を介して狭い範囲に強い力が加えられても部分的に応力が集中せず、狭い範囲が圧縮されて塑性変形することがない。従って、筒状樹脂粒子を多数集合させて成形して衝撃吸収体を形成することができ、吸音性を良好にさせることができる。
以上説明したように、本発明によると、良好な吸音性を有するとともに、部分的に強い圧縮力が加えられても圧縮を防いで反力を維持させ、良好な衝撃吸収性能を長期間維持することが可能であり、耐久性を向上させることが可能な衝撃吸収構造体を提供することができる。
Further, even when the impact absorber is formed by assembling a large number of cylindrical resin particles, a non-foamed plate-like member is laminated and integrated on the impact absorber, so that it is narrow via a floor carpet. Even if a strong force is applied to the range, the stress is not partially concentrated, and the narrow range is not compressed and plastically deformed. Therefore, a large number of cylindrical resin particles can be assembled and molded to form an impact absorber, and sound absorption can be improved.
As described above, according to the present invention, it has good sound absorption, and even when a strong compressive force is partially applied, it prevents compression and maintains reaction force, and maintains good shock absorption performance for a long time. It is possible to provide an impact absorbing structure that can improve durability.

(4)実施例:
以下、実施例を示して具体的に本発明を説明するが、本発明は実施例により限定されるものではない。
[実施例]
筒状樹脂粒子として発泡ポリプロピレン製の株式会社ジェイエスピー製のPEPP(ポーラスEPP。内径3mm、外径5mm、長さ4mm、密度0.045g/cm3の筒状のビーズ発泡体)を用い、縦120mm×横120mm×厚さ40mmの直方体形状の複数の蒸気孔を有する型内に筒状樹脂粒子を多数充填し、高温水蒸気を同型内に導入して多数の筒状樹脂粒子を直方体形状に発泡成形して衝撃吸収体とした。衝撃吸収体の発泡倍率は、20倍とした。
次に、縦120mm×横120mmで厚さを0.3mm、0.8mm、1.3mm、1.8mm、2.5mmと、0.3〜2.5mmの範囲で段階的に変えたポリプロピレンからなる樹脂プレートを上記衝撃吸収体の上面に対して両面テープで貼り付け、圧縮荷重測定用のサンプルとした。
[比較例1]
上記実施例で形成した衝撃吸収体をそのまま、すなわち樹脂プレートを貼り付けることなく、圧縮荷重測定用のサンプルとした。
[比較例2]
部分的な圧縮力に対して適度な反力を有する衝撃吸収体の例として、樹脂粒子として発泡ポリプロピレン製の株式会社ジェイエスピー製のEPP(略球形のビーズ発泡体)を用い、上述した縦120mm×横120mm×厚さ40mmの直方体形状の型内に樹脂粒子を多数充填し、高温水蒸気を同型内に導入して多数の樹脂粒子を直方体形状に発泡成形した衝撃吸収体を比較例2とした。衝撃吸収体の発泡倍率は、20倍とした。この衝撃吸収体をそのまま、すなわち樹脂プレートを貼り付けることなく、圧縮荷重測定用のサンプルとした。
(4) Example:
EXAMPLES Hereinafter, although an Example is shown and this invention is demonstrated concretely, this invention is not limited by an Example.
[Example]
Using PEPP (porous EPP, cylindrical bead foam with an inner diameter of 3 mm, an outer diameter of 5 mm, a length of 4 mm, and a density of 0.045 g / cm 3 ) made of expanded polypropylene, as the cylindrical resin particles, Filling a mold having a plurality of vapor holes with a rectangular parallelepiped shape of 120 mm × width 120 mm × thickness 40 mm, a large number of cylindrical resin particles are filled, and high-temperature steam is introduced into the mold to foam a large number of cylindrical resin particles into a rectangular parallelepiped shape. Molded into a shock absorber. The expansion ratio of the shock absorber was 20 times.
Next, from polypropylene whose thickness is 120 mm x 120 mm and whose thickness is 0.3 mm, 0.8 mm, 1.3 mm, 1.8 mm, 2.5 mm, and gradually changed in the range of 0.3 to 2.5 mm The resulting resin plate was affixed to the upper surface of the shock absorber with a double-sided tape to obtain a sample for measuring the compression load.
[Comparative Example 1]
The shock absorber formed in the above example was used as a sample for measuring compressive load as it was, that is, without attaching a resin plate.
[Comparative Example 2]
As an example of an impact absorber having an appropriate reaction force with respect to a partial compressive force, EPP (substantially spherical bead foam) manufactured by JSP Co., Ltd. made of expanded polypropylene is used as the resin particle, and the above-mentioned length of 120 mm. A comparative example 2 is an impact absorber in which a large number of resin particles are filled in a rectangular parallelepiped mold having a width of 120 mm and a thickness of 40 mm, and high-temperature water vapor is introduced into the mold to foam-mold many resin particles into a rectangular parallelepiped shape. . The expansion ratio of the shock absorber was 20 times. This shock absorber was used as a sample for measuring a compressive load as it was, that is, without attaching a resin plate.

[試験方法]
実施例および比較例で調整したサンプルの上面に対して半径30mmの半球面を有する金属製の圧縮治具を圧縮速度(下降速度)10mm/minで押して(下降させて)、サンプルの変位(圧縮治具の押し込み距離)に対する圧縮荷重を測定した。
[試験結果]
結果を、図5に示す。同図は、各実施例および比較例について圧縮荷重測定用のサンプルの変位(単位:mm)に対する圧縮荷重(単位:kN)をプロットして各点間を繋いで示している。図中、「1」〜「5」はそれぞれ厚さ0.3mm、0.8mm、1.3mm、1.8mm、2.5mmのポリプロピレン板を積層した衝撃吸収構造体の実施例、「比1」は多数の筒状樹脂粒子から成形して得られた衝撃吸収体のみの比較例1、「比2」は多数の球状樹脂粒子から成形して得られた衝撃吸収体のみの比較例2、を表している。
図に示すように、衝撃吸収体の変位に対する圧縮荷重は、筒状樹脂粒子を用いた衝撃吸収体のみの比較例1が最も小さく、ポリプロピレン板の厚みが増すほど大きくなる。貫通穴を有する筒状樹脂粒子を用いた衝撃吸収構造体について、部分的な圧縮力に対して適度な反力を有する衝撃吸収体(比較例2)とほぼ同等の反力が得られるポリプロピレン板の厚みは0.3〜1.3mmとなり、より同等の反力が得られるポリプロピレン板の厚みは0.8mmとなる。従って、発泡ポリプロピレン製の筒状樹脂粒子とポリプロピレン板とから衝撃吸収構造体を形成するとき、ポリプロピレン板を0.3〜1.3mm、より好ましくは0.8mmとすると、部分的に強い圧縮力が加えられても圧縮を防いで反力を維持させ、良好な衝撃吸収性能を長期間維持することが可能であるとともに、衝撃発生時に乗員の足への衝撃を少なくさせることができる。
[Test method]
A metal compression jig having a hemispherical surface with a radius of 30 mm is pushed (lowered) at a compression speed (lowering speed) of 10 mm / min with respect to the upper surface of the sample adjusted in the examples and comparative examples, and the sample is displaced (compressed). The compressive load with respect to the indentation distance of the jig was measured.
[Test results]
The results are shown in FIG. In the figure, the compressive load (unit: kN) against the displacement (unit: mm) of the sample for compressive load measurement is plotted for each of the examples and comparative examples, and the points are connected. In the figure, “1” to “5” are examples of impact absorbing structures in which polypropylene plates having thicknesses of 0.3 mm, 0.8 mm, 1.3 mm, 1.8 mm, and 2.5 mm are laminated, respectively, “Ratio 1”. "Is a comparative example 1 only of an impact absorber obtained by molding from a large number of cylindrical resin particles," Ratio 2 "is a comparative example 2 of only an impact absorber obtained by molding from a number of spherical resin particles, Represents.
As shown in the figure, the compressive load with respect to the displacement of the shock absorber is the smallest in Comparative Example 1 using only the shock absorber using the cylindrical resin particles, and increases as the thickness of the polypropylene plate increases. Polypropylene plate that can obtain a reaction force substantially equal to that of an impact absorber (Comparative Example 2) having an appropriate reaction force against a partial compressive force with respect to an impact absorption structure using cylindrical resin particles having through holes. The thickness of the polypropylene plate is 0.3 to 1.3 mm, and the thickness of the polypropylene plate from which the equivalent reaction force can be obtained is 0.8 mm. Therefore, when the shock absorbing structure is formed from the cylindrical resin particles made of expanded polypropylene and the polypropylene plate, if the polypropylene plate is 0.3 to 1.3 mm, more preferably 0.8 mm, a partially strong compressive force. Can be applied to prevent the compression and maintain the reaction force, maintain a good shock absorption performance for a long period of time, and reduce the impact on the occupant's foot when the impact occurs.

(5)変形例:
なお、本発明は、種々の変形例が考えられる。
本衝撃吸収構造体は、フロアパネルの平坦部22上にのみ設置されてもよいし、立壁部24上にのみ設置されてもよい。また、本衝撃吸収構造体は、ダッシュボード下部の車室側に設置されてもよいし、ダッシュボード下部からフロアパネル前部にかけての車室側に設置されてもよい。さらに、本衝撃吸収構造体は、車体パネルとフロアマットとの間に設置されてもよいし、フロアマットからフロアカーペットにかけての裏側に単一の構造体として設置されてもよい。
(5) Modification:
The present invention can be modified in various ways.
The shock absorbing structure may be installed only on the flat portion 22 of the floor panel, or may be installed only on the standing wall portion 24. In addition, the shock absorbing structure may be installed on the passenger compartment side below the dashboard, or may be installed on the passenger compartment side from the lower dashboard portion to the front portion of the floor panel. Further, the shock absorbing structure may be installed between the vehicle body panel and the floor mat, or may be installed as a single structure on the back side from the floor mat to the floor carpet.

図6に示すように、無発泡の板状部材54に、衝撃吸収体側の面54bとフロアカーペット30側の面54aとを貫通した貫通穴54cを多数形成してもよい。このような板状部材54は、例えば、ポリプロピレン等の熱可塑性樹脂を加熱して溶融させて射出成形することにより形成したり、上記板状部材14に対してプレスすることにより多数の貫通穴を打ち抜いて形成したりすることができる。複数の貫通穴54dが形成された板状部材54を用いると、車室内に入射した侵入音の音波が板状部材で反射せず、貫通穴54cから筒状樹脂粒子の貫通穴内に入りやすくなるので、吸音性をさらに良好にさせることが可能となる。また、衝撃吸収構造体の形状に合わせた型42内に筒状樹脂粒子を多数充填するとともにフロアカーペット30に面する位置に板状部材54を入れて加熱水蒸気を型42内に導入して衝撃吸収構造体を形成する場合には、水蒸気が板状部材の貫通穴を通過するので、さらに容易に型内全体を加熱することができる。板状部材の貫通穴を蒸気の通り道とすることにより、通常のビーズ成形型で衝撃吸収体と無発泡の板状部材とを容易に一体的に成形することができ、さらに容易に衝撃吸収構造体を形成することが可能となる。   As shown in FIG. 6, a large number of through holes 54 c may be formed in the non-foamed plate-like member 54 so as to penetrate the surface 54 b on the shock absorber side and the surface 54 a on the floor carpet 30 side. Such a plate-like member 54 is formed, for example, by heating and melting a thermoplastic resin such as polypropylene and injection molding, or by pressing the plate-like member 14 to form a large number of through holes. It can be formed by punching. When the plate-like member 54 in which the plurality of through holes 54d are formed is used, the sound wave of the intrusion sound incident on the vehicle interior is not reflected by the plate-like member, and easily enters the through holes of the cylindrical resin particles from the through holes 54c. Therefore, it is possible to further improve sound absorption. In addition, a large number of cylindrical resin particles are filled in the mold 42 in accordance with the shape of the shock absorbing structure, and a plate-like member 54 is placed at a position facing the floor carpet 30 to introduce heated steam into the mold 42 for impact. When forming the absorption structure, water vapor passes through the through holes of the plate-like member, so that the entire mold can be heated more easily. By making the through hole of the plate-shaped member a passage for steam, the shock absorber and the non-foamed plate-shaped member can be easily and integrally formed with a normal bead molding die, and the shock absorbing structure can be more easily formed. A body can be formed.

図7に示す衝撃吸収構造体60のように、衝撃吸収体62を、フロアパネルの平坦部22上に設置される衝撃吸収体平坦部62aと、フロアパネルの立壁部24上に設置される衝撃吸収体立壁部62bと、から構成してもよい。ここで、衝撃吸収体平坦部62aと衝撃吸収体立壁部62bとは、ともに発泡させた材質(好ましくは筒状樹脂粒子を多数集合させて成形した衝撃吸収体)とされ、互いに別の部材にされている。また、無発泡の板状部材64を、衝撃吸収体平坦部62aに一体化された板状部材平坦部64aと、衝撃吸収体立壁部62bに一体化された板状部材立壁部64bと、から構成している。ここで、板状部材平坦部64aと板状部材立壁部64bとは、互いに折り曲げ動作可能に接続されたヒンジ部64cとされている。板状部材64をポリプロピレン板等の合成樹脂板とする場合、板状部材平坦部64aと板状部材立壁部64bとの境界部を薄肉化して板状部材64を形成すると、この境界部をヒンジ部64cとして折り曲げ動作可能とすることができる。   Like the shock absorbing structure 60 shown in FIG. 7, the shock absorbing body 62 includes the shock absorbing body flat portion 62 a installed on the flat portion 22 of the floor panel and the shock installed on the standing wall portion 24 of the floor panel. You may comprise from the absorber standing wall part 62b. Here, the shock absorber flat portion 62a and the shock absorber standing wall portion 62b are both made of a foamed material (preferably a shock absorber formed by assembling a large number of cylindrical resin particles). Has been. Further, the non-foamed plate-like member 64 includes a plate-like member flat portion 64a integrated with the shock absorber flat portion 62a and a plate-like member standing wall portion 64b integrated with the shock absorber standing wall portion 62b. It is composed. Here, the plate-like member flat portion 64a and the plate-like member standing wall portion 64b are hinge portions 64c connected to each other so as to be able to be bent. When the plate member 64 is a synthetic resin plate such as a polypropylene plate, when the plate member 64 is formed by thinning the boundary between the plate member flat portion 64a and the plate member standing wall 64b, the boundary is hinged. The portion 64c can be bent.

上記衝撃吸収構造体60を製造するには、まず、複数の蒸気孔を有するとともに衝撃吸収構造体60の形状に合わせた型内に、衝撃吸収体平坦部62aと衝撃吸収体立壁部62bとの境界に耐熱性(例えば金属製)の仕切部材を入れ、筒状樹脂粒子16を多数充填するとともにフロアカーペット30に面する位置に板状部材64を入れ、型締めする。次に、筒状樹脂粒子16を構成する熱可塑性樹脂を加熱溶融させる温度にまで所定の加熱機により温度を上昇させた水蒸気を型内に導入する。すると、筒状樹脂粒子16をさらに発泡させながら筒状樹脂粒子16どうしを溶融させながら結着させて衝撃吸収体平坦部62aと衝撃吸収体立壁部62bとを形成させるとともに、板状部材平坦部64aを衝撃吸収体平坦部62aに結着させ、板状部材立壁部64bを衝撃吸収体立壁部62bに結着させる。型内を冷却した後、型を開くと、形成された衝撃吸収構造体を取り出すことができる。これにより、衝撃吸収体62に対してフロアカーペットに面する側に無発泡の板状部材64が積層されて一体化された衝撃吸収構造体60が製造される。   In order to manufacture the shock absorbing structure 60, first, the shock absorber flat portion 62a and the shock absorber standing wall portion 62b are placed in a mold having a plurality of vapor holes and matching the shape of the shock absorbing structure 60. A heat-resistant (for example, metal) partition member is placed at the boundary, a large number of cylindrical resin particles 16 are filled, and a plate-like member 64 is placed at a position facing the floor carpet 30 and clamped. Next, water vapor whose temperature is raised by a predetermined heater to a temperature at which the thermoplastic resin constituting the cylindrical resin particles 16 is heated and melted is introduced into the mold. Then, the cylindrical resin particles 16 are further foamed and bonded while melting the cylindrical resin particles 16 to form the shock absorber flat portion 62a and the shock absorber standing wall portion 62b, and the plate member flat portion. 64a is bound to the shock absorber flat portion 62a, and the plate-like member standing wall portion 64b is bound to the shock absorber standing wall portion 62b. When the mold is opened after the mold is cooled, the formed shock absorbing structure can be taken out. As a result, the shock absorbing structure 60 in which the non-foamed plate-like member 64 is laminated and integrated on the side facing the floor carpet with respect to the shock absorbing body 62 is manufactured.

上記衝撃吸収構造体60は、輸送時に、二つ折りにしたり、折り曲げず平板状にしたりすることができる。これによって、荷姿が良くなり、輸送効率を向上させることが可能となる。
以上説明したように、本発明によると、種々の態様により、部分的に強い圧縮力が加えられても部分的な圧縮を防いで反力を維持させ、良好な衝撃吸収性能を長期間維持することが可能であるとともに、耐久性を向上させることが可能な衝撃吸収構造体およびその製造方法を提供することができる。
The shock absorbing structure 60 can be folded in two at the time of transportation, or can be flat without being bent. As a result, the package appearance is improved and the transportation efficiency can be improved.
As described above, according to the present invention, according to various aspects, even if a strong compressive force is applied partially, partial compression is prevented and reaction force is maintained, and good shock absorption performance is maintained for a long time. In addition, it is possible to provide an impact-absorbing structure that can improve durability and a method for manufacturing the same.

衝撃吸収構造体を設置した乗用自動車の要部断面図。Sectional drawing of the principal part of the passenger car which installed the impact-absorbing structure. 衝撃吸収構造体の外観を示す斜視図。The perspective view which shows the external appearance of an impact-absorbing structure. 筒状樹脂粒子の外観を示す斜視図。The perspective view which shows the external appearance of a cylindrical resin particle. 衝撃吸収構造体の製造方法を示す流れ図。The flowchart which shows the manufacturing method of an impact-absorbing structure. 実施例および比較例においてサンプルの変位と圧縮荷重との関係を示す図。The figure which shows the relationship between the displacement of a sample and a compressive load in an Example and a comparative example. 変形例において無発泡の板状部材の外観を示す斜視図。The perspective view which shows the external appearance of the non-foamed plate-shaped member in a modification. 変形例にかかる衝撃吸収構造体を設置した乗用自動車の要部断面図。Sectional drawing of the principal part of the passenger car which installed the impact-absorbing structure concerning a modification.

符号の説明Explanation of symbols

10,60…衝撃吸収構造体
12,62…衝撃吸収体
14,54,64…無発泡の板状部材
16…筒状樹脂粒子(樹脂粒子)
16a…貫通穴
20…フロアパネル
22…平坦部
24…立壁部
26…境界部
30…フロアカーペット
42…型
54c…貫通穴
62a…衝撃吸収体平坦部
62b…衝撃吸収体立壁部
64a…板状部材平坦部
64b…板状部材立壁部
64c…ヒンジ部
DESCRIPTION OF SYMBOLS 10, 60 ... Shock absorption structure 12, 62 ... Shock absorber 14, 54, 64 ... Non-foamed plate-like member 16 ... Cylindrical resin particle (resin particle)
16a ... through hole 20 ... floor panel 22 ... flat portion 24 ... standing wall portion 26 ... boundary portion 30 ... floor carpet 42 ... mold 54c ... through hole 62a ... impact absorber flat portion 62b ... impact absorber standing wall portion 64a ... plate member Flat part 64b ... Plate-like member standing wall part 64c ... Hinge part

Claims (6)

自動車の乗員の足下において平坦部及び立壁部を有する車体パネルと、当該車体パネルの車室側に敷設される敷物と、の間に設置される衝撃吸収構造体であって、
発泡させた材質からなる衝撃吸収体に対して上記敷物に面する側に無発泡の板状部材が積層されて一体化された構造とされ、
上記衝撃吸収体は、上記平坦部上に設置される衝撃吸収体平坦部と、上記立壁部上に設置される衝撃吸収体立壁部と、が別の部材にされ、
上記無発泡の板状部材は、合成樹脂板からなるとともに、上記衝撃吸収体平坦部に一体化された板状部材平坦部と、上記衝撃吸収体立壁部に一体化された板状部材立壁部と、が折り曲げ動作可能に接続されていることを特徴とする衝撃吸収構造体。
A shock absorbing structure installed between a vehicle body panel having a flat part and a standing wall part under a passenger of an automobile, and a rug laid on the passenger compartment side of the vehicle body panel,
A non-foamed plate-like member is laminated and integrated on the side facing the rug with respect to the shock absorber made of the foamed material.
In the shock absorber, the shock absorber flat part installed on the flat part and the shock absorber vertical wall part installed on the standing wall part are separate members,
The non-foamed plate-shaped member is made of a synthetic resin plate, and has a plate-shaped member flat portion integrated with the shock absorber flat portion, and a plate-shaped member standing wall portion integrated with the shock absorber standing wall portion. Are connected so as to be able to bend.
上記衝撃吸収体は、合成樹脂を発泡させて筒状に形成した筒状樹脂粒子を多数集合させて成形した成形体とされていることを特徴とする請求項1に記載の衝撃吸収構造体。   2. The shock absorbing structure according to claim 1, wherein the shock absorbing body is a molded body formed by assembling a large number of cylindrical resin particles formed into a cylindrical shape by foaming a synthetic resin. 上記無発泡の板状部材には、上記衝撃吸収体側の面と上記敷物側の面とを貫通した貫通穴が複数形成されていることを特徴とする請求項1または請求項2に記載の衝撃吸収構造体。   3. The impact according to claim 1, wherein the non-foamed plate-like member is formed with a plurality of through holes penetrating the shock absorber side surface and the rug side surface. Absorbent structure. 上記衝撃吸収体は、合成樹脂を発泡させて成形した成形体とされ、
上記無発泡の板状部材は、上記板状部材平坦部と上記板状部材立壁部との境界部が薄肉化されたヒンジ部とされ、このヒンジ部により上記板状部材平坦部と上記板状部材立壁部とが折り曲げ動作可能に接続されていることを特徴とする請求項1〜請求項3のいずれか一項に記載の衝撃吸収構造体。
The shock absorber is a molded body formed by foaming synthetic resin,
The non-foamed plate member, the boundary portion between the upper Symbol plate member flat portion and the plate-shaped member rising wall portion is a thinned hinge portion, the plate-like member flat portion and the plate by the hinge portion The shock absorbing structure according to any one of claims 1 to 3, wherein the wall-like member standing wall is connected so as to be capable of bending.
自動車の乗員の足下において平坦部及び立壁部を有する車体パネルと、当該車体パネルの車室側に敷設される敷物と、の間に設置され、同平坦部上に設置される衝撃吸収体平坦部と同立壁部上に設置される衝撃吸収体立壁部とから構成され発泡させた材質からなる衝撃吸収体に対して上記敷物に面する側に無発泡の板状部材が積層されて一体化された構造とされる衝撃吸収構造体の製造方法であって、
上記無発泡の板状部材を、上記衝撃吸収体平坦部に一体化される板状部材平坦部と、上記衝撃吸収体立壁部に一体化される板状部材立壁部と、が折り曲げ動作可能に接続される合成樹脂板とし、
上記衝撃吸収構造体の形状に合わせた型内に、上記衝撃吸収体平坦部と上記衝撃吸収体立壁部との境界に当該衝撃吸収体平坦部と当該衝撃吸収体立壁部とを別の部材にする耐熱性の仕切部材を入れ、熱可塑性樹脂を発泡させて形成した樹脂粒子を多数充填するとともに上記敷物に面する位置に上記合成樹脂板を入れた後、同型内を加熱して同樹脂粒子どうしを溶融させながら結着させて上記衝撃吸収体平坦部と上記衝撃吸収体立壁部とを形成させるとともに、上記板状部材平坦部を上記衝撃吸収体平坦部に結着させ、上記板状部材立壁部を上記衝撃吸収体立壁部に結着させることにより、上記衝撃吸収体平坦部に一体化された上記板状部材平坦部と上記衝撃吸収体立壁部に一体化された上記板状部材立壁部とが折り曲げ動作可能に接続された上記衝撃吸収構造体を製造することを特徴とする衝撃吸収構造体の製造方法。
A shock absorber flat part installed between a vehicle body panel having a flat part and a standing wall part under the foot of an automobile occupant and a rug laid on the vehicle compartment side of the vehicle body panel and installed on the flat part. A non-foamed plate-like member is laminated and integrated on the side facing the rug with respect to the shock absorber made of a foamed material composed of a shock absorber standing wall portion installed on the same standing wall portion. A method of manufacturing a shock absorbing structure that is a
The non-foamed plate-like member can be bent by a plate-like member flat portion integrated with the shock absorber flat portion and a plate-like member standing wall portion integrated with the shock absorber standing wall portion. As a synthetic resin plate to be connected,
In a mold that matches the shape of the shock absorbing structure, the shock absorber flat portion and the shock absorber standing wall portion are separated from each other at the boundary between the shock absorber flat portion and the shock absorber standing wall portion. A heat-resistant partition member is inserted, filled with a large number of resin particles formed by foaming a thermoplastic resin, and the synthetic resin plate is placed at a position facing the rug, and then the inside of the mold is heated to form the resin particles Bonding while melting each other to form the shock absorber flat part and the shock absorber standing wall part, and binding the plate member flat part to the shock absorber flat part, the plate member The plate-like member flat part integrated with the shock absorber flat part and the plate-like member vertical wall integrated with the shock absorber stand wall part by binding the standing wall part to the shock absorber stand wall part Are connected to bendable Method for manufacturing a shock absorbing structure, characterized in that to produce a serial impact absorbing structure.
上記樹脂粒子が上記熱可塑性樹脂を発泡させて筒状に形成した筒状樹脂粒子であり、
上記型内に上記筒状樹脂粒子を多数充填するとともに上記敷物に面する位置に上記合成樹脂板を入れた後、同型内に水蒸気を導入して同型内を加熱して同筒状樹脂粒子どうしを溶融させながら結着させて衝撃吸収体を形成させるとともに同合成樹脂板を同衝撃吸収体に結着させることにより、上記衝撃吸収構造体を製造することを特徴とする請求項5に記載の衝撃吸収構造体の製造方法。
The resin particles are cylindrical resin particles formed into a cylindrical shape by foaming the thermoplastic resin,
After filling the cylindrical mold with a large number of the cylindrical resin particles and placing the synthetic resin plate at a position facing the rug, steam is introduced into the mold and the interior of the mold is heated so that the cylindrical resin particles are in contact with each other. 6. The shock absorbing structure is manufactured by forming a shock absorber by melting the resin and bonding the synthetic resin plate to the shock absorber. A method of manufacturing a shock absorbing structure.
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JP4778817B2 (en) * 2006-03-20 2011-09-21 積水化成品工業株式会社 Lower limb shock absorption structure for vehicles
JP4302712B2 (en) 2006-04-26 2009-07-29 積水化成品工業株式会社 Lower limb shock absorbing pad and vehicle floor spacer

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