JPH053414Y2 - - Google Patents
Info
- Publication number
- JPH053414Y2 JPH053414Y2 JP1986113174U JP11317486U JPH053414Y2 JP H053414 Y2 JPH053414 Y2 JP H053414Y2 JP 1986113174 U JP1986113174 U JP 1986113174U JP 11317486 U JP11317486 U JP 11317486U JP H053414 Y2 JPH053414 Y2 JP H053414Y2
- Authority
- JP
- Japan
- Prior art keywords
- recess
- core material
- foam
- present
- density
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Landscapes
- Laminated Bodies (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案はポリオレフイン系樹脂発泡体よりなる
自動車用バンパー芯材に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an automobile bumper core material made of polyolefin resin foam.
自動車バンパーとしては、従来、金属製板のも
のが一般的であつたが、近年、自動車の軽量化に
伴ない、発泡体の芯材の表面を金属製又は樹脂製
の表皮で被包した構造のものが用いられるように
なつてきた。このような自動車用バンパー芯材に
おいては、従来、ポリオレフイン系樹脂予備発泡
粒子を所要形状の金型に充填し、発泡させること
によつて得られるバンパー形状の発泡成形体を用
いることが知られている。また、これら芯材は、
通常、表示及びバンパーステーで囲まれる内側の
形状と一致するように形成されている。
Conventionally, car bumpers were generally made of metal plates, but in recent years, as automobiles have become lighter, structures in which the surface of a foam core material is covered with a metal or resin skin have been introduced. have come to be used. Conventionally, for such automobile bumper core materials, it has been known to use a bumper-shaped foam molded product obtained by filling pre-expanded polyolefin resin particles into a mold of a desired shape and foaming them. There is. In addition, these core materials are
Usually, it is formed to match the shape of the inside surrounded by the display and bumper stay.
従来のバンパー用芯材は軽量で、ある程度耐衝
撃性のあるものではあるが、この耐衝撃性の点で
はいまだ不満足の部分が存在していた。
Although conventional core materials for bumpers are lightweight and have some degree of impact resistance, there are still some areas where they are unsatisfactory in terms of impact resistance.
従来のバンパー用芯材は一般に2.5mile／hr〜
5.0mile／hr程度の衝撃に耐え得る様に形成され
ており、これをさらに高エネルギー吸収能を有す
る例えば10mile／hrにも耐え得るような芯材に
しようとするとその重量が増加し、発泡体本来の
軽量性を失つてしまう欠点が生じていた。 Conventional core material for bumpers generally has a speed of 2.5 miles/hr.
It is formed to withstand impact of about 5.0 miles/hr, and if you try to make it into a core material with higher energy absorption capacity, for example, that can withstand 10 miles/hr, the weight will increase and the foam The drawback was that it lost its original lightness.
本考案は、上記した従来技術の欠点に鑑みてな
されたもので、軽量性を損わず、しかも高エネル
ギー吸収能を有するバンパー用芯材を提供するこ
とを目的とする。 The present invention has been made in view of the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a core material for a bumper that does not impair its lightweight properties and has high energy absorption ability.
本考案者等は上記課題を解決するために鋭意研
究した結果、発泡体芯材の前面又は／及び後面に
凹部を設けると共に、この凹部の一部に特定の密
度を有する合成樹脂構造体を特定の割合で装着し
てなる自動車用バンパー芯材が、軽量性を損うこ
となくしかも高エネルギー吸収能を有するもので
あることを見出し、本考案を完成するに至つた。
As a result of intensive research into solving the above-mentioned problems, the inventors discovered that an automobile bumper core material made by forming a recess on the front and/or rear surface of a foam core material and attaching a synthetic resin structure having a specific density in a specific ratio to part of this recess has high energy absorption capacity without compromising its light weight, and thus completed the present invention.
即ち、本考案によれば、前面又は／及び後面に
凹部を有するポリオレフイン系樹脂発泡体よりな
る自動車用バンパー芯材であつて、該凹部の一部
には密度0.2〜1.5g／cm3の樹脂構造体が挿着され
ていると共に樹脂構造体の使用割合は凹部を有す
るポリオレフイン系樹脂発泡体に対する重量比で
１／50〜１／１の範囲としたことを特徴とする自
動車用バンパー芯材が提供される。 That is, according to the present invention, there is provided an automobile bumper core material made of a polyolefin resin foam having a concave portion on the front and/or rear surface, and a portion of the concave portion is filled with a resin having a density of 0.2 to 1.5 g/cm 3 . An automobile bumper core material is provided, in which a structure is inserted, and the proportion of the resin structure used is in the range of 1/50 to 1/1 in terms of weight ratio to the polyolefin resin foam having recesses. provided.
本考案のポリオレフイン系樹脂発泡体芯材は、
その前面又は／及び後面に凹部を形成すると共
に、その凹部の一部に密度0.2〜1.5g／cm3の樹脂
構造体を後記する特定割合で装着させた構造を有
するものである。この場合、芯材の前面又は／及
び後面に設ける凹部の形状は、円形状、楕円形
状、方形状等の各種の形状であるこができ、その
数は、通常１〜100個、好ましくは２〜50個であ
る。また、その１個の凹部の開口面積は、通常
0.5〜20cm2、好ましくは１〜10cm2であり、前面及
び／又は後面に設けた凹部の合計開口面積は、芯
材全体の前後方向における投影面積（凹部が存在
する部分を含む）に対し、15〜100％程度にする
のがよい。この場合、開口面積は、前面に設けた
凹部開口面積と後面に設けた凹部開口面積とは独
立に考慮され、前面に設けた開口面積と後面に設
けた開口面積の総和が、前記範囲にあればよい。
また、本考案では、凹部１つの最大深さを該部分
での芯材の前後方向における厚さ（凹部を埋設し
た状態での厚さ）の15％以上、好ましくは50〜95
％とすることが好ましい。特に、芯材の前後両者
に凹部を設ける場合においては、前記のように、
それぞれの面において凹部の開口面積を上記範囲
とし、また、凹部の深さに関しては、凹部が前後
面に一致して設けられた場合には、該部分の両凹
部の最大深さの総和を上記範囲とすれば良い。 The polyolefin resin foam core material of this invention is
It has a structure in which a recess is formed on the front surface and/or the rear surface, and a resin structure having a density of 0.2 to 1.5 g/cm 3 is attached to a part of the recess at a specific ratio described later. In this case, the shape of the recesses provided on the front and/or rear surfaces of the core material can be various shapes such as circular, elliptical, and square, and the number of recesses is usually 1 to 100, preferably 2 to 100. There are 50 pieces. Also, the opening area of that one recess is usually
0.5 to 20 cm 2 , preferably 1 to 10 cm 2 , and the total opening area of the recesses provided on the front and/or rear surfaces is based on the projected area of the entire core material in the front-rear direction (including the part where the recesses are present). It is best to set it between 15 and 100%. In this case, the opening area is considered independently of the opening area of the recess provided on the front surface and the opening area of the recess provided on the rear surface, and the total opening area of the opening area provided on the front surface and the opening area provided on the rear surface is within the above range. Bye.
In addition, in the present invention, the maximum depth of one recess is 15% or more of the thickness of the core material in the front-rear direction at that part (thickness with the recess buried), preferably 50 to 95%.
% is preferable. In particular, when providing recesses on both the front and back of the core material, as described above,
The opening area of the recess on each surface shall be within the above range, and regarding the depth of the recess, if the recess is provided to coincide with the front and rear surfaces, the sum of the maximum depths of both recesses in that part shall be the above range. It may be within the range.
本考案で芯材として用いるポリオレフイン系樹
脂発泡体において、その密度は、通常0.15〜
0.01g／cm3、好ましくは0.1〜0.015g／cm3であり、
またその樹脂の具体例としては、例えば、ポリプ
ロピレン、エチレン−プロピレンランダム共重合
体、エチレン−プロピレンブロツク共重合体等の
ポリプロピレン系樹脂、高密度ポリエチレン樹脂
又は高密度ポリエチレン樹脂にビニル芳香族モノ
マーを吸収重合させて得られた樹脂等が挙げら
れ、なかでもポリプロピレン系樹脂が最も好まし
いものである。また、芯材の凹部の一部に装着さ
せる樹脂構造体は、発泡体又は無発泡体のいずれ
でもよいが、その密度は0.2〜1.5g／cm3の範囲に
するのがよい。この樹脂構造体の素材としては、
例えば、ポリプロピレン、ポリエチレン等のポリ
オレフイン系樹脂、硬質ポリウレタン、ポリスチ
レン、各種ナイロン、ポリカーボネート、ポリエ
チレンテレフタレート、硬質塩化ビニル樹脂等が
挙げられる。樹脂構造体の形状は、前記凹部の一
部に装着し得る形状及び寸法のものであればよ
く、例えば、凹部の一部を埋設する板体、板体の
結合体、ハニカム構造体等が挙げられる。 The density of the polyolefin resin foam used as the core material in this invention is usually 0.15~
0.01g/cm 3 , preferably 0.1 to 0.015g/cm 3 ,
Specific examples of the resin include polypropylene resins such as polypropylene, ethylene-propylene random copolymers, ethylene-propylene block copolymers, high-density polyethylene resins, or high-density polyethylene resins that absorb vinyl aromatic monomers. Examples include resins obtained by polymerization, among which polypropylene resins are most preferred. Further, the resin structure attached to a part of the recess of the core material may be either a foamed material or a non-foamed material, but its density is preferably in the range of 0.2 to 1.5 g/cm 3 . The material for this resin structure is
Examples include polyolefin resins such as polypropylene and polyethylene, rigid polyurethane, polystyrene, various nylons, polycarbonates, polyethylene terephthalate, and rigid vinyl chloride resins. The shape of the resin structure may be any shape and size as long as it can be installed in a part of the recess, and examples thereof include a plate for burying a part of the recess, a combination of plates, a honeycomb structure, etc. It will be done.
本発明で用いるこの樹脂構造体の使用割合は、
凹部を有する発泡体に対する重量比で、１／50〜
１／１、好ましくは１／20〜１／２の範囲にする
必要がある。 The usage ratio of this resin structure used in the present invention is:
Weight ratio to foam with recesses: 1/50~
It is necessary to make it 1/1, preferably in the range of 1/20 to 1/2.
本考案で用いる樹脂構造体において、その密度
が前記範囲であつても、その発泡体に対する重量
割合が１／１を越えるようになると芯材全体の重
量が重くなり、一方、１／50よりも小さくなると
エネルギー吸収性に劣るようになる。また、逆
に、発泡体に対する樹脂構造体の重量割合が前記
範囲にあつても、構造体の密度が0.2g／cm3未満で
はエネルギー吸収性に劣り、一方、構造体の密度
が1.5g／cm3を超えると芯材全体の重量が重くなる
ので好ましくない。 In the resin structure used in the present invention, even if its density is within the above range, if the weight ratio to the foam exceeds 1/1, the weight of the entire core material will become heavy; As it becomes smaller, its energy absorption becomes inferior. Conversely, even if the weight ratio of the resin structure to the foam is within the above range, if the density of the structure is less than 0.2 g/ cm3 , the energy absorption property will be poor; If it exceeds cm 3 , the weight of the entire core material becomes heavy, which is not preferable.
以下、図面を参照して本考案の実施例を示す。 Embodiments of the present invention will be described below with reference to the drawings.
第１図は芯材として用いるポリオレフイン系樹
脂発泡体の形状を示すもので、第１図ａはその斜
面図であり、第１図ｂは第１図ａのＡ−Ａ面に沿
つた断面図である。第１図において、１はポリオ
レフイン系樹脂発泡体、２はその前面に設けた凹
部である。 Figure 1 shows the shape of the polyolefin resin foam used as the core material, Figure 1a is its oblique view, and Figure 1b is a cross-sectional view taken along plane A-A in Figure 1a. It is. In FIG. 1, 1 is a polyolefin resin foam, and 2 is a recess provided on the front surface thereof.
第２図は、前記凹部２に装着させる樹脂構造体
の１例についての斜面図である。 FIG. 2 is a perspective view of an example of a resin structure mounted in the recess 2. FIG.
第３図は、第１図に示した発泡体の凹部に第２
図に示した樹脂構造体を装着した芯材の斜面図で
ある。 Figure 3 shows that a second
FIG. 3 is a perspective view of a core material equipped with the resin structure shown in the figure.
〔考案の効果〕
次に、本考案の効果を確認するために、第４図
に示す凹部１１を有する直方体１０を密度
0.04g／cm3のエチレン−プロピレンランダム共重
合体の発泡体で作ると共に、第５図に示す形状の
構造体２０をポリプロピレン発泡体（密度
0.32g／cm3）で作つた。この場合、直方体１０の
寸法は、縦ｅ：80mm、横ｆ：80mm及び高さｄ：50
mmであり、その中央部に形成した凹部の寸法は、
縦ａ：40mm、横ｂ：40mm、深さｃ：30mmであつ
た。また、構造体２０の寸法はｍ：39mm，ｎ：39
mm，ｐ：30mm，：10mmであつた。[Effect of the invention] Next, in order to confirm the effect of the invention, a rectangular parallelepiped 10 having a recess 11 shown in FIG.
The structure 20 having the shape shown in FIG . 5 is made of polypropylene foam (density
0.32g/cm 3 ). In this case, the dimensions of the rectangular parallelepiped 10 are length e: 80 mm, width f: 80 mm, and height d: 50 mm.
mm, and the dimensions of the recess formed in the center are:
Length a: 40 mm, width b: 40 mm, and depth c: 30 mm. Also, the dimensions of the structure 20 are m: 39 mm, n: 39
mm, p: 30 mm, : 10 mm.
次に、第５図の構造体を第４図に示した直方体
の凹部に装着し、その表面全体にわたつて板状の
衝撃スピード5mile／hrの条件で落下させて衝撃
テストを行い、その際の直方体の受ける厚み方向
の歪み（％）と動的応力（Kg／cm2）を測定した。
その結果を第６図にグラフとして示す。また、比
較のために、構造体２０を装着しない以外は同様
にして衝撃テストを行つた。その結果を第６図に
合わせて示す。 Next, the structure shown in Figure 5 was installed in the recess of the rectangular parallelepiped shown in Figure 4, and an impact test was performed by dropping the structure over its entire surface at a plate-like impact speed of 5 miles/hr. The strain (%) in the thickness direction and the dynamic stress (Kg/cm 2 ) of the rectangular parallelepiped were measured.
The results are shown as a graph in FIG. Further, for comparison, an impact test was conducted in the same manner except that the structure 20 was not attached. The results are also shown in FIG.
第６図に示した応力−歪み曲線から、エネルギ
ー吸収効率を、特開昭58−221745号公報に記載さ
れた方法に従つて算出した結果、比較品の場合は
70％であるのに対し、本考案品の場合は77％であ
り、特に、歪み50％の時のエネルギー吸収効率で
は、本考案品は、比較品に対し、30％の吸収効率
の向上を示した。 From the stress-strain curve shown in Figure 6, the energy absorption efficiency was calculated according to the method described in Japanese Patent Application Laid-Open No. 58-221745.
70%, whereas it is 77% for the invented product. In particular, in terms of energy absorption efficiency when the strain is 50%, the invented product has a 30% improvement in energy absorption efficiency compared to the comparative product. Indicated.
なお、本考案品では、構造体２０の発泡体１０
に対する重量比は１／５であつた。 In addition, in the product of the present invention, the foam 10 of the structure 20
The weight ratio was 1/5.
以上に示した衝撃テストの結果からもわかるよ
うに、本考案の自動車バンパー用芯材は、明らか
に衝撃吸収効率の向上したものであり、しかも、
本考案では、その軽量性が格別損われるようなこ
ともない。従つて、本考案の自動車バンパー用芯
材を用いる時には、同一重量品で比較すると、衝
撃吸収効率の向上を達成することができ、また同
一衝撃吸収効率品で比較すると、軽量化及び小型
化を達成することができる。 As can be seen from the results of the impact tests shown above, the core material for automobile bumpers of the present invention clearly has improved impact absorption efficiency.
In the present invention, there is no particular loss in its lightness. Therefore, when using the core material for automobile bumpers of the present invention, it is possible to achieve improved impact absorption efficiency when comparing products of the same weight, and it is possible to achieve reductions in weight and size when comparing products with the same impact absorption efficiency. can be achieved.
第１図は凹部を有する芯材用発泡体についての
もので、第１図ａはその斜面図、第１図ｂはＡ−
Ａ断面図を示す。第２図は発泡体凹部に装着する
構造体の形状を示す斜面図を示す。第３図は、凹
部に構造体を装着した本考案の芯材の斜面図を示
す。第４図は、衝撃テストに用いた凹部を有する
発泡体サンプル、第５図はその凹部に装着させる
構造体サンプルについての斜面図である。第６図
は衝撃テストで得られた動的応力−歪み曲線を示
すグラフである。
１……発泡体、２……凹部、３……構造体、１
０……発泡体サンプル、１１……凹部、２０……
構造体サンプル。
Figure 1 shows a foam for core material having a concave portion, Figure 1a is its oblique view, and Figure 1b is A-
A sectional view is shown. FIG. 2 shows a perspective view showing the shape of the structure to be installed in the foam recess. FIG. 3 shows a perspective view of the core material of the present invention with a structure attached to the recess. FIG. 4 is a perspective view of a foam sample having a recess used in the impact test, and FIG. 5 is a perspective view of a structure sample mounted in the recess. FIG. 6 is a graph showing the dynamic stress-strain curve obtained in the impact test. 1... Foam, 2... Recess, 3... Structure, 1
0... Foam sample, 11... Concavity, 20...
Structure sample.
Claims (1)
イン系樹脂発泡体よりなる自動車用バンパー芯材
であつて、該凹部の一部には密度0.2〜1.5g／cm3
の樹脂構造体が挿着されていると共に樹脂構造体
の使用割合は凹部を有するポリオレフイン系樹脂
発泡体に対する重量比で１／50〜１／１の範囲と
したことを特徴とする自動車用バンパー芯材。 An automobile bumper core material made of a polyolefin resin foam having a concave portion on the front and/or rear surface, and a portion of the concave portion has a density of 0.2 to 1.5 g/cm 3
A bumper core for an automobile, characterized in that a resin structure is inserted therein, and the ratio of the resin structure used is in the range of 1/50 to 1/1 in terms of weight ratio to the polyolefin resin foam having recesses. Material.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986113174U JPH053414Y2 (en) | 1986-07-22 | 1986-07-22 | |
| EP87306439A EP0254530B1 (en) | 1986-07-22 | 1987-07-21 | Core material for automobile bumpers |
| US07/075,978 US4756948A (en) | 1986-07-22 | 1987-07-21 | Core material for automobile bumpers |
| DE8787306439T DE3765488D1 (en) | 1986-07-22 | 1987-07-21 | CORE MATERIAL FOR MOTOR VEHICLE BUMPER. |
| CA000542676A CA1279081C (en) | 1986-07-22 | 1987-07-21 | Core material for automobile bumpers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986113174U JPH053414Y2 (en) | 1986-07-22 | 1986-07-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6318360U JPS6318360U (en) | 1988-02-06 |
| JPH053414Y2 true JPH053414Y2 (en) | 1993-01-27 |
Family
ID=30994723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986113174U Expired - Lifetime JPH053414Y2 (en) | 1986-07-22 | 1986-07-22 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH053414Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4951164B2 (en) * | 2006-12-20 | 2012-06-13 | 株式会社ジェイエスピー | Shock absorbing member |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5145747U (en) * | 1974-09-30 | 1976-04-03 | ||
| JPS54118749U (en) * | 1978-02-08 | 1979-08-20 | ||
| JPS59182718A (en) * | 1983-03-31 | 1984-10-17 | Japan Styrene Paper Co Ltd | Formation of core of bumper for automobile in mold |
-
1986
- 1986-07-22 JP JP1986113174U patent/JPH053414Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6318360U (en) | 1988-02-06 |
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