JP4059655B2

JP4059655B2 - Automotive floor spacer and manufacturing method thereof

Info

Publication number: JP4059655B2
Application number: JP2001316740A
Authority: JP
Inventors: 正弘小谷; 哲也加藤; 英明時田; 誠宮本
Original assignee: Hitachi Chemical Co Ltd; Showa Denko Materials Co Ltd
Current assignee: Showa Denko Materials Co Ltd
Priority date: 2001-10-15
Filing date: 2001-10-15
Publication date: 2008-03-12
Anticipated expiration: 2021-10-15
Also published as: JP2003118460A

Description

【０００１】
【発明の属する技術分野】
本発明は、自動車の乗員座席の足元周辺に敷設され、床面の平坦性の確保及び車内外で発生する衝撃に対する乗員の保護を目的とした硬質発泡体製の自動車用フロアスペーサに関し、更に詳しくは、要求される機能の異なるフロアスペーサと衝撃吸収部材を一体化した自動車用フロアスペーサとその製造方法に関する。
【０００２】
【従来の技術】
近年、自動車に用いられる部材は走行距離に対する燃料消費率の向上を目的に、軽量化が求められている。従来、自動車用フロアスペーサとして、乗員足元の平坦さの保持や断熱性の向上を目的に、発泡ウレタンチップを固めた成形品が用いられてきた。
一方、自動車衝突時の乗員保護のため、衝突安全性向上を目的に、車体構造の改善や衝撃吸収部材の採用が行われており、自動車用の衝撃吸収部材としては、硬質発泡ウレタンが多く採用されてきたが、乗員の足元周りの安全性向上と軽量化の両立は、これからの課題とされていた。
【０００３】
【発明が解決しようとする課題】
これまで自動車用フロアスペーサとして用いられてきた発泡ウレタンチップ成形品は、圧縮強度が低いことから、発泡体の密度をおよそ１００ｋｇ／ｍ³と高くする必要があった。乗用車における自動車用フロアスペーサの敷き詰められる床面積は車種により異なるが、およそ１〜２ｍ²あり、フロアスペーサの厚みを５ｃｍとすると、車１台あたりの重量が５〜１０ｋｇと重くなるため、軽量化が課題であった。
【０００４】
一方、自動車内外で発生する衝撃に対するエネルギ吸収材、例えばドア内に配置されるエネルギ吸収体としては、衝撃を受けて変形する歪み量（％）が大きくなっても応力上昇が少ない特徴を持つ素材として、発泡ウレタンが多く採用されている。また、自動車の衝突安全性の更なる向上を目的に、車体構造改善や衝突時に乗員に負荷を与え得る部材へ衝撃吸収効果を付加することが求められていた。
しかしながら、発泡ウレタンは熱硬化性樹脂であることからリサイクルできないことや、他の発泡プラスチックと比較して同一密度での強度が低いこと、吸水率が高いこと、コスト的に割高になる等の問題があり、自動車用フロアスペーサへの適用範囲は限られたものにならざるを得なかった。
【０００５】
本発明は、上記の問題にかんがみなされたものであり、より軽量な部材で、居住性と衝撃安全性を向上させることができる自動車用フロアスペーサの提供を目的とする。
【０００６】
【課題を解決するための手段】
上記目的を達成するため、本発明は、自動車の乗員座席の足元の床面に敷設されるフロアスペーサと、このフロアスペーサの前部における足元前面に敷設される衝撃吸収部材とを備えた自動車用フロアスペーサであって、前記衝撃吸収部材を、硬質発泡体で、室内側には平担面を形成し、底面側にはハニカム構造、スリット構造及び／又は突起構造を有する構成とし、前記フロアスペーサを、硬質発泡体で、室内側には平担面を形成し、床面側には床面の凹凸に沿った形状を形成した構成とし、前記衝撃吸収部材の硬質発泡体の密度を、前記フロアスペーサの硬質発泡体の密度より高密度とし、かつ、前記衝撃吸収部材の後端に突起を設け、前記フロアスペーサの前部に、前記突起の嵌合する嵌合部を設けた構成としてある。
【０００７】
また、本発明は、前記硬質発泡体が、発泡性熱可塑性樹脂粒子を所定の密度に一次発泡したのち、金型に充填し、スチーム等の加熱により成形され、密度が１０ｋｇ／ｍ³以上２００ｋｇ／ｍ³以下の発泡成形品であって、前記衝撃吸収部材及び前記フロアスペーサが同一の素材からなる構成とすることが好ましい。
【０００８】
さらに、本発明は、製造方法としても実現可能であり、自動車の乗員座席の足元の床面に敷設されるフロアスペーサと、このフロアスペーサの前部において足元前面に敷設される衝撃吸収部材とを備えた自動車用フロアスペーサの製造方法であって、硬質発泡体で、室内側に平担面を形成し、床面側に床面の凹凸に沿った形状を形成するとともに、前部に嵌合部を形成した前記フロアスペーサを成形し、前記フロアスペーサの硬質発泡体より高密度の硬質発泡体で、室内側に平担面を形成し、底面側にハニカム構造、スリット構造及び／又は突起構造を形成するとともに、後端に突起を形成した衝撃吸収部材を成形し、前記衝撃吸収部材の後端の前記突起を、前記フロアスペーサの前記嵌合部に嵌合して自動車用フロアスペーサを製造する方法としてある。
【０００９】
【発明の実施の形態】
以下、本発明の実施形態について説明する。
図１は、自動車の乗員前部座席における足元周辺に敷設する実施形態の全体図を示す。
自動車用フロアスペーサ１は、床面に敷設されるフロアスペーサ２と、このフロアスペーサ２の前部に位置し、斜め上方に取り付けられる衝撃吸収部材３とで構成してある。
【００１０】
本実施形態におけるフロアスペーサ２の形状は、座席下部床面の凹凸をなくし、室内側への平面付与ができるものなら特に制限はない。例えば、図２（ａ）及び（ｂ）に示すように、室内側に位置する表面が平坦状となっており、自動車床面と当接する裏面が、床面の凹凸に沿った曲面形状とすることができる。
一方、本実施形態で用いられる衝撃吸収部材３は、室内側に位置する表面が平坦状になっており、床面と連続する前部傾斜面と当接する裏面は、図３に示すようなハニカム構造、図４に示すようなスリット構造あるいは図５に示すような突起構造となっている。これら構造は単独又は組み合わせることによってその機能を果たす。
【００１１】
フロアスペーサ２は前部に貫通孔（嵌合部）２ａが設けてあり、衝撃吸収部材３は後端に凸部（突起）３ａが設けてある。そして、衝撃吸収部材３の後端に設けた凸部３ａが、フロアスペーサ２の前部に設けた貫通孔２ａと嵌合することによって、一体化された自動車用フロアスペーサ１を構成している。
【００１２】
本実施形態におけるフロアスペーサ２や衝撃吸収部材３は、硬質発泡体によって形成するが、例えば、リサイクルが可能な無架橋の熱可塑性樹脂である硬質発泡プラスチックであって、発泡性樹脂粒子を所定の密度に一次発泡した後、金型に充填し、スチーム等の加熱により成形される発泡成形品が好ましい。このような硬質発泡プラスチックとしては、発泡ポリエチレン、発泡ポリプロピレン等の発泡ポリオレフィン等があるが、本実施形態では、特に経済性と成形品物性に優れた発泡ポリスチレン系プラスチックを用いることが好ましい。
【００１３】
発泡ポリスチレン系プラスチックには、耐薬品性を向上させたスチレン／アクリロニトリル樹脂、耐熱性を向上させたスチレン／アクリロニトリル／α−メチルスチレン樹脂等の発泡体等がある。本実施形態に用いられる硬質発泡プラスチックの密度は、要求される耐圧荷重と、衝撃吸収性のバランスにより決定されることから、１０ｋｇ／ｍ³以上２００ｋｇ／ｍ³以下の範囲とすることが好ましい。フロアスペーサ２及び衝撃吸収部材３の密度は、同一であっても、異なっても良く、特に制限されるものではない。
【００１４】
フロアスペーサに要求される耐圧加重（必要な圧縮強度）は、例えば、靴のかかとの面積（５×３＝１５ｃｍ²）に、荷重３０ｋｇがかかったとき、３０／１５＝２ｋｇ／ｃｍ²≒０．２ＭＰａとなる。
図８に、本実施形態で用いられる硬質発泡プラスチックの一例であるスチレン／アクリロニトリル樹脂発泡体（日立化成工業（株）製ハイビーズＧＲ）の密度を変えた場合の静的圧縮試験における圧縮歪みとそのときの圧縮応力との関係を示した。
図８から、圧縮歪みを１０％としたとき、圧縮強度が０．２ＭＰａ以上となる密度は、２５ｋｇ／ｍ³以上であることが判る。
【００１５】
一方、衝撃吸収部材３の裏面側におけるハニカム構造、スリット構造又は突起構造の必要な圧縮強度は、床面に対する接触面積の比率で除したものとなる。ここで、衝撃吸収部材の床面との接触面積を６０％とすると、必要な圧縮強度は、０．２ＭＰａ／０．６＝０．３３ＭＰａとなる。
先と同様に、図８より圧縮歪みを１０％としたとき、圧縮強度が０．３ＭＰａ以上となる硬質発泡プラスチックの密度は３３ｋｇ／ｍ³以上であることが判る。本実施形態では、想定される耐圧荷重と衝撃吸収部材の構造によって、必要な圧縮強度と密度が異なるものの、強度の維持及び軽量性から硬質発泡プラスチックの密度は１０ｋｇ／ｍ³以上２００ｋｇ／ｍ³以下であることが好ましい。
【００１６】
通常、ハニカム構造は、正６角形の蜂の巣状を意味するが、本実施形態においては、ｎが３以上のｎ角形、円形又は楕円形でもよい。また、突起構造についても突起の断面形状が、ｎが３以上のｎ角形、円形又は楕円形まで自由に選択することができる。
また、自動車用フロアスペーサ２に応力が働いた場合には、嵌合部に応力が集中し突起３ａから破損の起こる可能性があるので、フロアスペーサ２と衝撃吸収部材３との嵌合は、高密度側が凸構造となることが好ましい。本実施形態の自動車用フロアスペーサにおいては、硬質発泡プラスチック自体が有する緩衝性とハニカム等の構造要因による効果が相乗的に働き、より高い衝撃吸収性能が発揮される。
【００１７】
【実施例】
以下、実施例を示し、更に詳細に説明するが、本発明は、これに限定されるものではない。
図２に示す外観を有するフロアスペーサ２を、日立化成工業（株）製発泡性ポリスチレン／アクリロニトリル樹脂、ハイビーズＧＲを素材とした、密度２０ｋｇ／ｍ³の硬質発泡プラスチックで作製した。フロアスペーサ２の全容積は、１５０００ｍｌ、重量は、３００ｇであった。
図６（ａ）、（ｂ）及び（ｃ）に示す外観を有する衝撃吸収部材３を、日立化成工業（株）製発泡性ポリスチレン／アクリロニトリル樹脂、ハイビーズＧＲを素材とした、密度６７ｋｇ／ｍ³の硬質発泡プラスチックで作製した。衝撃吸収部材３の全容積は２１００ｍｌ、重量は１４０ｇ、衝撃吸収部材３のハニカム構造の寸法は、肉厚４４ｍｍ、表皮肉厚８ｍｍ、ハニカム高さ３６ｍｍ、ハニカムのリブ幅５ｍｍとした。
【００１８】
実施例の特性
同容積のフロアスペーサをウレタンチップの圧縮物で作った場合の重量は約３ｋｇとなることから、フロアスペーサ２については２．７ｋｇ重量を低減することができた。
衝撃吸収部材３の機能比較の一例として、同一素材で、同一重量となるハニカムのない、密度３３ｋｇ／ｍ³の発泡プラスチック（比較例）と比較した。ＪＩＳ−Ｚ０２３５に準拠して衝撃試験を行った結果を図８に示す。試験は、底面積が７０ｃｍ²、重量が４．５ｋｇのおもりを、高さを変えて自由落下させて成形品に衝突させ、そのときの圧縮歪みと圧縮応力の関係を調べた。
図９より、比較例は圧縮歪みが大きくなるにつれて圧縮応力が増加していくのに対し、本実施例品は、圧縮歪み１５％〜６０％の間では圧縮応力がほぼ一定の値を示し、衝撃吸収性能が優れていることが判った。
【００１９】
【発明の効果】
本発明の衝撃吸収部材が一体化された自動車用フロアスペーサによれば、より軽量な部材で、居住性と衝撃安全性を向上させることができる。
【図面の簡単な説明】
【図１】本発明の一実施形態にかかる自動車用フロアスペーサを示す図。
【図２】フロアスペーサであり、（ａ）は表面を示し、（ｂ）は裏面を示す図。
【図３】衝撃吸収部材の構造の例（ハニカム構造）を示す図。
【図４】衝撃吸収部材の構造の例（スリット構造）を示す図。
【図５】衝撃吸収部材の構造の例（突起構造）を示す図。
【図６】ハニカム構造の衝撃吸収部材を示し、（ａ）は表面側、（ｂ）は裏面側及び（ｃ）は側面側の略図。
【図７】フロアスペーサと衝撃吸収部材との嵌合を示す図。
【図８】日立化成工業（株）製「ハイビーズＧＲ」成形品の圧縮歪みと応力の関係を示す図。
【図９】本発明品の衝撃吸収特性測定結果を示す図。
【符号の説明】
１自動車用フロアスペーサ
２フロアスペーサ
２ａ貫通孔
３衝撃吸収部材
３ａ凸部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automotive floor spacer made of hard foam, which is laid around the foot of a passenger seat of an automobile and is intended to ensure the flatness of the floor surface and protect the passenger against an impact generated inside and outside the vehicle. Relates to a floor spacer for an automobile in which a floor spacer and a shock absorbing member having different functions are integrated, and a method for manufacturing the same .
[0002]
[Prior art]
In recent years, members used in automobiles are required to be reduced in weight for the purpose of improving the fuel consumption rate with respect to the travel distance. Conventionally, as a floor spacer for an automobile, a molded product in which a foamed urethane chip is hardened has been used for the purpose of maintaining the flatness of an occupant's feet and improving heat insulation.
On the other hand, in order to protect passengers in the event of a car crash, improvements to the body structure and the use of shock absorbing members have been carried out with the aim of improving collision safety, and hard foamed urethane is often used as the shock absorbing member for automobiles. However, both improvement of safety around the feet of passengers and weight reduction have been considered as future issues.
[0003]
[Problems to be solved by the invention]
Since the foamed urethane chip molded product that has been used as a floor spacer for automobiles has a low compressive strength, it has been necessary to increase the density of the foam to about 100 kg / m ³ . The floor area of passenger cars that can be covered with floor spacers varies depending on the vehicle type, but there are approximately 1 to ² m ^2, and if the thickness of the floor spacer is 5 cm, the weight per vehicle will be as heavy as 5 to 10 kg. Was an issue.
[0004]
On the other hand, as an energy absorber for impact generated inside and outside the automobile, for example, an energy absorber disposed in a door, a material having a characteristic that the stress increase is small even if the amount of strain (%) deformed by the impact increases. As a result, urethane foam is often used. In addition, for the purpose of further improving the collision safety of automobiles, it has been required to add a shock absorbing effect to a member that can apply a load to an occupant during a vehicle body structure improvement or a collision.
However, urethane foam is a thermosetting resin, so it cannot be recycled, has low strength at the same density compared to other foamed plastics, has a high water absorption rate, and is expensive. Therefore, the range of application to floor spacers for automobiles has to be limited.
[0005]
The present invention has been considered in view of the above problems, and an object of the present invention is to provide an automobile floor spacer that can improve comfort and impact safety with a lighter member.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides an automotive vehicle comprising a floor spacer laid on the floor of a foot of a passenger seat of an automobile and an impact absorbing member laid on the front of the foot at the front of the floor spacer. A floor spacer, wherein the impact absorbing member is made of hard foam, has a flat surface on the indoor side, and has a honeycomb structure, a slit structure and / or a protrusion structure on the bottom side, and the floor spacer The hard foam, a flat surface is formed on the indoor side, and a shape along the floor surface unevenness is formed on the floor side, and the density of the hard foam of the shock absorbing member is The density is higher than the density of the hard foam of the floor spacer, and a projection is provided at the rear end of the shock absorbing member, and a fitting portion for fitting the projection is provided at the front of the floor spacer. .
[0007]
In the present invention, the hard foam is first foamed with foaming thermoplastic resin particles to a predetermined density, filled into a mold, and molded by heating with steam or the like, and the density is 10 kg / m ³ or more and 200 kg. / m ³ a following expansion-molded article, it is preferable to adopt a configuration in which the shock absorbing member and the floor spacer is made of the same material.
[0008]
Furthermore, the present invention can also be realized as a manufacturing method, and includes a floor spacer laid on the floor of the foot of a passenger seat of an automobile, and an impact absorbing member laid on the front of the foot at the front of the floor spacer. A method of manufacturing an automotive floor spacer provided with a hard foam, forming a flat surface on the indoor side, forming a shape along the unevenness of the floor surface on the floor side, and fitting to the front The floor spacer is formed with a hard foam having a higher density than the hard foam of the floor spacer, a flat surface is formed on the indoor side, and a honeycomb structure, a slit structure and / or a protrusion structure on the bottom side And forming a shock absorbing member having a protrusion at the rear end, and fitting the protrusion at the rear end of the shock absorbing member to the fitting portion of the floor spacer to produce a floor spacer for an automobile. To do There as.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described.
FIG. 1 shows an overall view of an embodiment in which the vehicle is laid around a foot in a front passenger seat of an automobile.
The automotive floor spacer 1 is composed of a floor spacer 2 laid on the floor surface and an impact absorbing member 3 located at the front of the floor spacer 2 and attached obliquely upward.
[0010]
The shape of the floor spacer 2 in the present embodiment is not particularly limited as long as the unevenness of the floor surface below the seat is eliminated and a flat surface can be given to the indoor side. For example, as shown in FIGS. 2 (a) and 2 (b), the surface located on the indoor side is flat, and the back surface in contact with the automobile floor surface has a curved shape along the unevenness of the floor surface. be able to.
On the other hand, the shock absorbing member 3 used in the present embodiment has a flat surface located on the indoor side, and the back surface contacting the front inclined surface continuous with the floor surface is a honeycomb as shown in FIG. The structure is a slit structure as shown in FIG. 4 or a protrusion structure as shown in FIG. These structures perform their functions singly or in combination.
[0011]
The floor spacer 2 has a through hole (fitting portion) 2a at the front, and the shock absorbing member 3 has a convex portion (projection) 3a at the rear end. And the convex part 3a provided in the rear end of the impact-absorbing member 3 fits with the through-hole 2a provided in the front part of the floor spacer 2, thereby constituting an integrated automobile floor spacer 1. .
[0012]
The floor spacer 2 and the impact absorbing member 3 in the present embodiment are formed of a hard foam. For example, the floor spacer 2 and the impact absorbing member 3 are hard foamed plastics that are non-crosslinked thermoplastic resins that can be recycled, and the foamable resin particles are formed in a predetermined manner. A foam-molded product that is first foamed to a density, then filled in a mold and molded by heating such as steam is preferable. Examples of such rigid foamed plastics include foamed polyolefins such as foamed polyethylene and foamed polypropylene. In the present embodiment, it is particularly preferable to use a foamed polystyrene-based plastic excellent in economic efficiency and physical properties of the molded product.
[0013]
Examples of the expanded polystyrene plastic include foams such as styrene / acrylonitrile resin with improved chemical resistance and styrene / acrylonitrile / α-methylstyrene resin with improved heat resistance. Since the density of the hard foam plastic used in the present embodiment is determined by the balance between the required pressure resistance load and impact absorbability, the density is preferably in the range of 10 kg / m ^{3 to} 200 kg / m ³ . The densities of the floor spacer 2 and the impact absorbing member 3 may be the same or different, and are not particularly limited.
[0014]
The pressure load (necessary compressive strength) required for the floor spacer is, for example, 30/15 = 2 kg / cm ² ≈0 when a load of 30 kg is applied to the heel area (5 × 3 = 15 cm ² ) of the shoe. .2 MPa.
FIG. 8 shows compressive strain in a static compression test when the density of a styrene / acrylonitrile resin foam (High Beads GR manufactured by Hitachi Chemical Co., Ltd.), which is an example of a hard foam plastic used in the present embodiment, is changed. The relationship with the compressive stress was shown.
FIG. 8 shows that the density at which the compressive strength is 0.2 MPa or more when the compressive strain is 10% is 25 kg / m ³ or more.
[0015]
On the other hand, the required compressive strength of the honeycomb structure, slit structure or protrusion structure on the back surface side of the impact absorbing member 3 is divided by the ratio of the contact area to the floor surface. Here, if the contact area of the shock absorbing member with the floor surface is 60%, the required compressive strength is 0.2 MPa / 0.6 = 0.33 MPa.
Similarly to the above, it can be seen from FIG. 8 that when the compressive strain is 10%, the density of the hard foam plastic having a compressive strength of 0.3 MPa or more is 33 kg / m ³ or more. In this embodiment, although the required compressive strength and density differ depending on the assumed pressure load and the structure of the shock absorbing member, the density of the hard foamed plastic is 10 kg / m ³ or more and 200 kg / m ³ because of strength maintenance and light weight. The following is preferable.
[0016]
Usually, the honeycomb structure means a regular hexagonal honeycomb shape, but in the present embodiment, n may be an n-gonal shape, a circular shape or an elliptical shape having 3 or more. In addition, regarding the protrusion structure, the cross-sectional shape of the protrusion can be freely selected from an n-square shape, a circular shape, or an ellipse shape where n is 3 or more.
In addition, when stress is applied to the automobile floor spacer 2, the stress is concentrated on the fitting portion and damage may occur from the protrusion 3a. Therefore, the fitting between the floor spacer 2 and the shock absorbing member 3 is as follows. It is preferable that the high density side has a convex structure. In the automotive floor spacer of the present embodiment, the cushioning properties of the hard foamed plastic itself and the effects of structural factors such as the honeycomb work synergistically, and higher impact absorbing performance is exhibited.
[0017]
【Example】
EXAMPLES Hereinafter, although an Example is shown and demonstrated in detail, this invention is not limited to this.
The floor spacer 2 having the appearance shown in FIG. 2 was made of a hard foamed plastic with a density of 20 kg / m ³ made of a foamable polystyrene / acrylonitrile resin and high beads GR manufactured by Hitachi Chemical Co., Ltd. The total volume of the floor spacer 2 was 15000 ml, and the weight was 300 g.
The impact absorbing member 3 having the appearance shown in FIGS. 6 (a), 6 (b) and 6 (c) is made from Hitachi Chemical Co., Ltd., expandable polystyrene / acrylonitrile resin, high beads GR, and has a density of 67 kg / m ^3. Made of hard foam plastic. The total volume of the shock absorbing member 3 is 2100 ml, the weight is 140 g, the honeycomb structure of the shock absorbing member 3 has a thickness of 44 mm, a skin thickness of 8 mm, a honeycomb height of 36 mm, and a honeycomb rib width of 5 mm.
[0018]
Characteristics of Examples Since the weight of the floor spacer having the same volume made of compressed urethane chips is about 3 kg, the weight of the floor spacer 2 can be reduced by 2.7 kg.
As an example of the functional comparison of the impact absorbing member 3, a comparison was made with a foamed plastic (comparative example) having a density of 33 kg / m ^{3 and having} no honeycomb having the same weight and the same material. FIG. 8 shows the result of the impact test conducted in accordance with JIS-Z0235. In the test, a weight having a bottom area of 70 cm ² and a weight of 4.5 kg was dropped freely at a different height and collided with a molded product, and the relationship between compression strain and compression stress at that time was examined.
From FIG. 9, while the compressive stress increases as the compressive strain increases in the comparative example, the product of this example shows a substantially constant value of the compressive stress between the compressive strain of 15% and 60%. It was found that the shock absorbing performance was excellent.
[0019]
【The invention's effect】
According to the automotive floor spacer in which the impact absorbing member of the present invention is integrated, the comfortability and impact safety can be improved with a lighter member.
[Brief description of the drawings]
FIG. 1 is a diagram showing an automotive floor spacer according to an embodiment of the present invention.
FIG. 2 is a floor spacer, (a) showing the front surface, and (b) showing the back surface.
FIG. 3 is a diagram showing an example of a structure of a shock absorbing member (honeycomb structure).
FIG. 4 is a view showing an example of the structure of a shock absorbing member (slit structure).
FIG. 5 is a diagram showing an example of the structure of a shock absorbing member (projection structure).
6A and 6B show a shock absorbing member having a honeycomb structure, in which FIG. 6A is a schematic view of a front surface side, FIG. 6B is a back surface side, and FIG.
FIG. 7 is a diagram showing the fitting between the floor spacer and the shock absorbing member.
FIG. 8 is a diagram showing the relationship between compressive strain and stress of a molded product of “High Beads GR” manufactured by Hitachi Chemical Co., Ltd.
FIG. 9 is a graph showing the results of measuring shock absorption characteristics of the product of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Automotive floor spacer 2 Floor spacer 2a Through-hole 3 Shock absorption member 3a Convex part

Claims

A floor spacer for an automobile comprising a floor spacer laid on the floor of the foot of an automobile passenger seat and an impact absorbing member laid on the front of the foot at the front of the floor spacer,
The shock absorbing member is made of a hard foam, has a flat surface on the indoor side, and has a honeycomb structure, a slit structure and / or a protrusion structure on the bottom surface side,
The floor spacer is made of hard foam, a flat surface is formed on the indoor side, and a shape is formed along the unevenness of the floor surface on the floor surface side.
The density of the hard foam of the shock absorbing member is higher than the density of the hard foam of the floor spacer,
And the floor spacer for motor vehicles provided with the protrusion at the rear end of the said shock-absorbing member, and provided the fitting part which the said protrusion fits in the front part of the said floor spacer.

The hard foam is subjected to primary foaming of foamable thermoplastic resin particles to a predetermined density, then filled into a mold, and molded by heating with steam or the like. The foam has a density of 10 kg / m ³ or more and 200 kg / m ³ or less. The automobile floor spacer according to claim 1, wherein the shock absorbing member and the floor spacer are formed of the same material.

A method of manufacturing a vehicle floor spacer comprising a floor spacer laid on the floor of a foot of a passenger seat of an automobile and an impact absorbing member laid on the front of the foot at the front of the floor spacer,
Hard foam, forming a flat surface on the indoor side, forming a shape along the unevenness of the floor surface on the floor side, and molding the floor spacer formed with a fitting portion on the front,
A hard foam with a higher density than the hard foam of the floor spacer, a flat support surface is formed on the indoor side, a honeycomb structure, a slit structure and / or a protrusion structure is formed on the bottom side, and a protrusion is formed on the rear end. Molded shock absorbing member,
A method for manufacturing an automotive floor spacer, comprising manufacturing the automotive floor spacer by fitting the protrusion at the rear end of the shock absorbing member into the fitting portion of the floor spacer.