JP2000189289A - Seat pad for vehicle - Google Patents
Seat pad for vehicleInfo
- Publication number
- JP2000189289A JP2000189289A JP10373204A JP37320498A JP2000189289A JP 2000189289 A JP2000189289 A JP 2000189289A JP 10373204 A JP10373204 A JP 10373204A JP 37320498 A JP37320498 A JP 37320498A JP 2000189289 A JP2000189289 A JP 2000189289A
- Authority
- JP
- Japan
- Prior art keywords
- seat pad
- main part
- hardness
- pad
- urethane
- 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.)
- Pending
Links
Landscapes
- Chair Legs, Seat Parts, And Backrests (AREA)
- Mattresses And Other Support Structures For Chairs And Beds (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、例えば自動車等
の乗り物のシートに好適に使用されるシートパッドに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat pad suitably used for a seat of a vehicle such as an automobile.
【０００２】[0002]
【従来の技術】自動車等の乗り物に使用されるシート
は、座部（シートクッション）と背もたれ（シートバッ
ク）とを備えて構成されている。これら座部と背もたれ
には、従来より、例えばポリウレタンフォームからなる
シートパッドが使われていた。この種のシートパッド
は、安全性あるいは快適性等の観点から、着座荷重を受
けるメイン部の左右両側に、着座者のホールド性を高め
るために、着座者の体側がわに突き出るサイド部を一体
に成形したものとなっている。2. Description of the Related Art A seat used for vehicles such as automobiles is provided with a seat (seat cushion) and a backrest (seat back). Conventionally, a seat pad made of, for example, polyurethane foam has been used for the seat and the backrest. From the viewpoint of safety or comfort, this type of seat pad is integrated with side parts on the left and right sides of the main part that receives a sitting load, in order to improve the holdability of the seated person, the body side of the seated person protruding aside. It has been molded into.
【０００３】また、ホールド性をさらに高めかつ乗り心
地を良くする要求から、図３および図４に示すように、
メイン部１に比べてサイド部２を硬くしたいわゆる異硬
度パッド３も多用されている。従来は、このような異硬
度パッド３にみられるようにメイン部１とサイド部２と
の硬度差については考慮されていたが、反発弾性に関し
ては、通常、メイン部１とサイド部２とに同程度の反発
弾性のポリウレタンフォームが使用されていた。[0003] Further, from the demand for further improving the holdability and improving the riding comfort, as shown in FIGS.
A so-called different hardness pad 3 in which the side portion 2 is harder than the main portion 1 is often used. Conventionally, a difference in hardness between the main portion 1 and the side portion 2 has been considered as seen in such a different hardness pad 3. Polyurethane foam of similar rebound resilience was used.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、人が着
座した後の最終姿勢時には、図４中に着座ラインＡ，Ｂ
で示すように、異硬度化されたサイド部２に身体の一部
が触れ、メイン部１との硬度差のために異物感が発生し
ていた。特に体格の大きい着座者（ラインＡで示す）の
場合にはメイン部１の撓みも大きいため、体格の小さい
着座者（ラインＢで示す）と比較してサイド部２に接す
る面積が広くなり、その分、異物感が強くなる。However, in the final posture after the person is seated, the seating lines A and B in FIG.
As shown by, a part of the body touched the side part 2 having different hardness, and a foreign substance sensation occurred due to a difference in hardness from the main part 1. In particular, in the case of a seated person having a large physique (indicated by line A), since the deflection of the main portion 1 is large, the area in contact with the side portion 2 becomes larger than that of a seated person having a small physique (indicated by line B). To that extent, the feeling of foreign matter becomes stronger.
【０００５】また、異物感を少しでも軽減する試みとし
て、図５に示すようにサイド部２にスリット４を形成し
てサイド部２の硬さを調整するようにしたシートパッド
３ａも考えられた。しかしこのシートパッド３ａは、ス
リット４を設けた個所が違和感の原因となったり、パッ
ド３ａの発泡成形に用いるモールド型内にスリット形成
用の凸壁を設ける必要があることから、モールド型の構
造が複雑化するとともに、モールド型内にウレタン原料
を注入しにくくなり、パッド３ａの品質が安定しないこ
とがあった。[0005] As an attempt to reduce the feeling of foreign matter even slightly, a seat pad 3a in which a slit 4 is formed in the side portion 2 to adjust the hardness of the side portion 2 as shown in FIG. . However, in the seat pad 3a, the location where the slit 4 is provided may cause discomfort, or a convex wall for forming a slit must be provided in a mold used for foam molding of the pad 3a. , And it became difficult to inject the urethane raw material into the mold, and the quality of the pad 3a was sometimes unstable.
【０００６】従って本発明の目的は、ホールド性を維持
しながらも異物感の発生を回避できるような乗り物用シ
ートパッドを提供することにある。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle seat pad capable of avoiding the appearance of a foreign object while maintaining the holdability.
【０００７】[0007]
【課題を解決するための手段】シートパッドの硬度は、
人が着座した状態での硬度を表すために、荷重を負荷す
ることによって厚み方向に所定量圧縮し、約２０秒間経
過した応力緩和後の反力が測定される。これに対しシー
トパッドのホールド性能は、例えば車両がカーブ走行す
る時などに身体の横ずれを抑制する能力に依存し、荷重
が負荷されつつある比較的短時間のうちの反力が重要で
ある。The hardness of the seat pad is as follows.
In order to express the hardness when a person is seated, a load is applied to compress a predetermined amount in the thickness direction, and a reaction force after stress relaxation after about 20 seconds has elapsed is measured. On the other hand, the hold performance of the seat pad depends on, for example, the ability to suppress lateral displacement of the body when the vehicle runs on a curve, and the reaction force within a relatively short time when a load is being applied is important.
【０００８】本発明者らは、ポリウレタンフォームの反
発弾性を下げると応力緩和が大きくなることに着目し、
低反発性のウレタンをサイド部に使用することで、サイ
ド部のホールド性を悪化させずにサイド部の実質的な硬
さ（荷重を負荷したのちの応力緩和後の測定値）を従来
よりも下げることで、異物感を大幅に下げることができ
ることを見出だした。The present inventors have focused on the fact that reducing the rebound resilience of polyurethane foam increases stress relaxation,
By using low resilience urethane for the side part, the substantial hardness of the side part (measured value after stress relaxation after applying a load) can be improved compared to the conventional type without deteriorating the holdability of the side part. It has been found that by lowering, the feeling of foreign objects can be significantly reduced.
【０００９】従って前記目的を果たすための本発明の乗
り物用シートパッドは、ポリウレタンフォームからなる
メイン部と、前記メイン部の左右両側にメイン部の表面
よりも着座者側に突出するサイド部とを有し、前記サイ
ド部は前記メイン部に比べて反発弾性率の低いポリウレ
タンフォームによって構成したことを特徴とする。Therefore, the vehicle seat pad of the present invention for achieving the above object has a main portion made of polyurethane foam and side portions protruding from the surface of the main portion to the occupant side with respect to the left and right sides of the main portion. Wherein the side portion is made of polyurethane foam having a lower rebound resilience than the main portion.
【００１０】このような構成の本発明の異硬度シートパ
ッドであれば、着座後のメイン部とサイド部の実質的な
硬度差を従来品に比べて下げることができ、サイド部の
異物感が緩和されるとともに、カーブ走行時などのホー
ルド性が確保され、より安全で快適な乗り心地が得られ
る。According to the seat pad of the present invention having such a structure, a substantial difference in hardness between the main portion and the side portion after sitting can be reduced as compared with the conventional product, and foreign-body sensation on the side portion can be reduced. As well as being relaxed, the holdability at the time of curve running etc. is secured, and a safer and more comfortable ride can be obtained.
【００１１】[0011]
【発明の実施の形態】以下にこの発明の一実施形態につ
いて、図１および図２を参照して説明する。図１に示す
自動車用シート等に使われる異硬度シートパッド１０
は、ポリウレタンフォームからなるメイン部１１と、メ
イン部１１の左右両側にメイン部１１の表面１１ａより
も着座者側に突出するサイド部１２とを有している。そ
してサイド部１２はメイン部１１に比べて反発弾性の低
いポリウレタンフォームによって構成されている。メイ
ン部１１とサイド部１２との境１３が異硬度の境界とな
っている。図１において、線分Ｃは人が着座したときの
最終安定姿勢を示す着座ラインである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. Different hardness seat pad 10 used for automobile seats and the like shown in FIG.
Has a main part 11 made of polyurethane foam, and side parts 12 protruding to the occupant side from the surface 11a of the main part 11 on both left and right sides of the main part 11. The side part 12 is made of a polyurethane foam having a lower rebound resilience than the main part 11. A boundary 13 between the main part 11 and the side part 12 is a boundary of different hardness. In FIG. 1, a line segment C is a seating line indicating a final stable posture when a person is seated.
【００１２】従来のように単にサイド部１２をメイン部
１１よりも硬くしただけでは、部分的なサイド部１２の
当たりが生じたり、異物感を生じる原因となる。そこで
この実施形態では、サイド部１２の反発弾性率に関し、
メイン部１１の反発弾性率よりも低反発な処方のポリウ
レタンフォーム２０を用いている。ここで言う反発弾性
率は、所定の高さからパッドに向かって鉄球などを落下
させたときにパッドから跳ね返った高さの比率である。If the side portion 12 is simply made harder than the main portion 11 as in the prior art, it may cause a partial contact with the side portion 12 or a foreign-body sensation. Therefore, in this embodiment, regarding the rebound resilience of the side portion 12,
Polyurethane foam 20 having a lower resilience than the resilience of the main part 11 is used. The rebound resilience referred to here is the ratio of the height rebounded from the pad when an iron ball or the like is dropped from a predetermined height toward the pad.
【００１３】この発明の一実施例として、メイン部１１
に使われるウレタンフォームは、密度２６ｋｇ／ｍ3 、
着座２０秒後の２５％硬度が１２ｋｇ／３１４ｃｍ2 、
反発弾性率４０％である。これに対しサイド部１２に使
われる低反発ウレタンフォーム２０は、密度４０ｋｇ／
ｍ3 、着座２０秒後の２５％硬度が１７ｋｇ／３１４ｃ
ｍ2 、反発弾性率１８％である。As an embodiment of the present invention, a main unit 11
The urethane foam used for is a density of 26 kg / m 3 ,
The 25% hardness after sitting for 20 seconds is 12 kg / 314 cm 2 ,
The rebound resilience is 40%. On the other hand, the low rebound urethane foam 20 used for the side part 12 has a density of 40 kg /
m 3, 25% hardness after seating 20 seconds 17 kg / 314c
m 2 , and a rebound resilience of 18%.
【００１４】この実施例では、従来のＨＯＴウレタンと
同様のポリオールとイソシアネート成分を主体とし、整
泡剤や触媒等を添加したメイン原料を発泡成形用のモー
ルド型のメイン部成形用の部分に注入ヘッドによって注
入し、かつ、サイド部１２を成形する部分には前述の低
反発ウレタン用に処方された異硬度部原料を注入し、モ
ールド型を閉めて発泡させ、所定時間キュアすることに
より、メイン部１１とサイド部１２とが一体化した所望
形状のＨＯＴウレタン製品を得るようにしている。In this embodiment, a main raw material mainly composed of a polyol and an isocyanate component similar to a conventional HOT urethane and containing a foam stabilizer and a catalyst is injected into a main molding portion of a mold for foam molding. Inject the raw material of the different hardness prescribed for the low resilience urethane into the portion where the side portion 12 is formed by injecting with the head, and close the mold to foam and cure for a predetermined time. A desired shape of the HOT urethane product in which the portion 11 and the side portion 12 are integrated is obtained.
【００１５】図２は、上記実施例品のサイド部１２に用
いる低反発ＨＯＴウレタンと、従来のサイド部に用いら
れているＨＯＴウレタンとについて、それぞれのテスト
品を負荷速度５００ｍｍ／分で厚み方向に２５％圧縮
し、その後、２０秒間の応力緩和過程での反力を測定し
た結果（静荷重応力緩和線図）である。実施例品と従来
品の２５％圧縮時の硬度はいずれも３１ｋｇｆ／３１４
ｃｍ2 で等しいが、２０秒後（応力緩和後）の硬度を比
較すると、従来のウレタンは２４ｋｇｆであったのに対
し、本実施例の低反発ウレタンは１７ｋｇｆと、小さな
値を示した。FIG. 2 shows the test results of the low rebound HOT urethane used for the side portion 12 of the above-described embodiment and the conventional HOT urethane used for the side portion at a load speed of 500 mm / min in the thickness direction. This is a result (static load stress relaxation diagram) of measuring the reaction force in the stress relaxation process for 20 seconds after compressing by 25%. The hardness at the time of 25% compression of the example product and the conventional product is 31 kgf / 314.
Although equal cm 2, when comparing the hardness after 20 seconds (after stress relaxation), whereas conventional urethane was 24Kgf, Foam of this example exhibited a 17 kgf, a small value.
【００１６】すなわち実施例品は、車両がカーブ走行す
る際などの比較的短時間に生じる荷重負荷過程での横ず
れを抑える能力に関し、従来品と遜色のない良好なホー
ルド性を発揮できる。そして着座者が着座後に異物感を
感じる時点での硬さに関しては、従来品の２４ｋｇｆに
対して実施例品では１７ｋｇｆと、７ｋｇｆ下がること
により、従来品と比較して柔らかく感じることができる
ようになる。In other words, the product of the embodiment can exhibit a good holding performance comparable to that of the conventional product with respect to the ability to suppress the lateral displacement during the load application process which occurs in a relatively short time such as when the vehicle runs on a curve. With respect to the hardness at the time when the occupant feels a foreign body sensation after sitting, the weight is reduced by 17 kgf in the example product to 7 kgf in comparison with the conventional product of 24 kgf, so that the occupant can feel softer than the conventional product. Become.
【００１７】次表１は、従来の異硬度シートパッドと前
記実施例の異硬度シートパッド１０の密度と硬度および
反発弾性を比較したものである。従来品（比較例）の異
硬度パッドの着座２０秒後の２５％硬度は、メイン部が
１２ｋｇｆ／３１４ｃｍ2 、サイド部が２４ｋｇｆ／３
１４ｃｍ2 で硬度差が１２ｋｇｆ、反発弾性がメイン
部，サイド部とも４０％であり、異物感を生じていた。The following Table 1 compares the density, hardness and rebound resilience of the conventional different hardness sheet pad and the different hardness sheet pad 10 of the above embodiment. The 25% hardness of a conventional product (comparative example) of a different hardness pad after sitting for 20 seconds is 12 kgf / 314 cm 2 for the main portion and 24 kgf / 3 for the side portion.
At 14 cm 2 , the difference in hardness was 12 kgf, and the rebound resilience was 40% for both the main part and the side parts, giving a feeling of foreign matter.
【００１８】これに対し本発明の実施例品では、サイド
部１２に用いるウレタンフォームの反発弾性率を１８％
に下げたことによって応力緩和が大きくなり、着座２０
秒後の２５％硬度は、メイン部が１２ｋｇｆ／３１４ｃ
ｍ2 、サイド部が１７ｋｇｆ／３１４ｃｍ2 で硬度差５
ｋｇｆと減少している。なお、表１においてコア密度と
あるのは、ウレタンフォーム表面のスキン層を除く実質
的なウレタンフォームの密度を示している。On the other hand, in the embodiment of the present invention, the rebound resilience of the urethane foam used for the side portion 12 is 18%.
The stress relief is increased by lowering
The hardness after 25 seconds is 12kgf / 314c for the main part.
m 2 , side part 17kgf / 314cm 2 and hardness difference 5
kgf. In Table 1, the term "core density" indicates the substantial density of the urethane foam excluding the skin layer on the surface of the urethane foam.
【００１９】[0019]
【表１】 [Table 1]
【００２０】このような構成の本実施例の異硬度シート
パッド１０であれば、着座後ある程度時間が経過したの
ちのメイン部１１とサイド部１２の実質的な硬度差を従
来品に比べて下げることができ、着座者の身体とサイド
部１２との接触部が身体によくなじむ。しかもサイド部
１２の密度と硬度はメイン部１１よりも高いため、着座
者の体格差にかかわらず良好なホールド性が確保される
とともに、従来発生していた異物感を解消できた。しか
も本実施例のサイド部１２に用いるＨＯＴウレタンは、
従来のシートパッドに用いられていたＨＯＴウレタンの
反発弾性を下げるような処方に変えるだけでよく、他の
物性値を変えることなく実施できるものである。In the case of the seat pad 10 of the present embodiment having such a structure, a substantial difference in hardness between the main portion 11 and the side portion 12 after a certain period of time has elapsed after sitting is reduced as compared with the conventional product. The contact portion between the body of the occupant and the side portion 12 fits well into the body. Moreover, since the density and hardness of the side portion 12 are higher than those of the main portion 11, good holding properties are ensured irrespective of the difference in physique of the occupant, and the foreign-body sensation that has conventionally occurred can be eliminated. Moreover, the HOT urethane used for the side portion 12 of the present embodiment is:
It is only necessary to change the formulation so as to reduce the rebound resilience of HOT urethane used in conventional seat pads, and it can be carried out without changing other physical property values.
【００２１】なお、この発明はシートクッションに限ら
ず、シートバックにも適用することができる。またこの
発明を実施するに当たって、メイン部やサイド部の形状
をはじめとして、この発明の構成要素の形状や物性等を
適宜に変形して実施できることは言うまでもない。前記
実施形態ではホットキュアウレタンを用いる例について
説明したが、この発明を実施するに当たって、ＨＲ（Hi
gh Resiliency ）コールドキュアウレタンが適用されて
もよい。The present invention can be applied not only to a seat cushion but also to a seat back. In carrying out the present invention, it goes without saying that the shape and physical properties of the components of the present invention, including the shapes of the main portion and the side portions, can be appropriately modified. In the above embodiment, an example using hot cure urethane has been described. However, in embodying the present invention, HR (Hi
gh Resiliency) Cold cure urethane may be applied.
【００２２】[0022]
【発明の効果】本発明の異硬度シートパッドによれば、
着座後のサイド部が身体によくなじむため、体格等にか
かわらず異物感を緩和できるとともに、カーブ走行時な
どにはサイド部が従来と同等のホールド性を確保でき、
安全で快適な乗り心地が得られる。そして本発明によれ
ば、スリットを設ける従来例（図５）のようなスリット
部の違和感を生じることがなく、狭いスリット内への注
入により発生する問題が解消され、ウレタン原料を注入
しやすく、安定した品質のシートパッドを提供できる。According to the different hardness sheet pad of the present invention,
Since the side part after seating fits well into the body, it can alleviate foreign body irrespective of physique etc., and at the time of curve running etc., the side part can secure the same holdability as before,
A safe and comfortable ride can be obtained. According to the present invention, the problem caused by the injection into the narrow slit is solved without causing a feeling of strangeness of the slit portion unlike the conventional example (FIG. 5) in which the slit is provided, and the urethane raw material can be easily injected. A stable quality seat pad can be provided.
【図１】 本発明の一実施形態を示すシートパッドの断
面図。FIG. 1 is a sectional view of a seat pad according to an embodiment of the present invention.
【図２】 本発明と従来のシートパッドを圧縮したとき
の経過時間と荷重との関係を示す静荷重応力緩和線図。FIG. 2 is a static load stress relaxation diagram showing the relationship between elapsed time and load when a seat pad of the present invention and a conventional seat pad are compressed.
【図３】 シートパッドの斜視図。FIG. 3 is a perspective view of a seat pad.
【図４】 図３中のIV−IV線に沿う従来のシートパッド
の断面図。FIG. 4 is a sectional view of the conventional seat pad taken along line IV-IV in FIG. 3;
【図５】 スリットを形成した従来例を示すシートパッ
ドの断面図。FIG. 5 is a sectional view of a seat pad showing a conventional example in which a slit is formed.
１０…異硬度シートパッド １１…メイン部 １２…サイド部 ２０…低反発ウレタンフォーム 10: Different hardness seat pad 11: Main part 12: Side part 20: Low resilience urethane foam
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） // Ｂ２９Ｋ 75:00 105:04 Ｂ２９Ｌ 31:58 Ｆターム(参考） 3B084 BA00 CA07 CB01 3B096 AA01 AB06 AB07 AD07 4F204 AA31 AG20 AH26 EA01 EB01 EB28 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) // B29K 75:00 105: 04 B29L 31:58 F-term (Reference) 3B084 BA00 CA07 CB01 3B096 AA01 AB06 AB07 AD07 4F204 AA31 AG20 AH26 EA01 EB01 EB28
Claims (1)
と、 前記メイン部の左右両側に前記メイン部の表面よりも着
座者側に突出するサイド部とを有し、 前記サイド部は前記メイン部に比べて反発弾性率の低い
ポリウレタンフォームによって構成したことを特徴とす
る乗り物用シートパッド。1. A main part made of polyurethane foam, and side parts protruding to the occupant side from the surface of the main part on both left and right sides of the main part, wherein the side part is compared with the main part. A vehicle seat pad comprising a polyurethane foam having a low rebound resilience.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10373204A JP2000189289A (en) | 1998-12-28 | 1998-12-28 | Seat pad for vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10373204A JP2000189289A (en) | 1998-12-28 | 1998-12-28 | Seat pad for vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000189289A true JP2000189289A (en) | 2000-07-11 |
Family
ID=18501765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10373204A Pending JP2000189289A (en) | 1998-12-28 | 1998-12-28 | Seat pad for vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000189289A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003045198A1 (en) * | 2001-11-26 | 2003-06-05 | Bridgestone Corporation | Seat pad for vehicle |
| US7802853B2 (en) | 2004-12-28 | 2010-09-28 | Bridgestone Corporation | Seat cushion pad for vehicle, seat back pad for vehicle, and seat for vehicle |
| JP2011218227A (en) * | 2004-12-28 | 2011-11-04 | Bridgestone Corp | Seat back pad for vehicle, and seat for vehicle |
| DE102015209062A1 (en) | 2014-05-20 | 2015-11-26 | Toyota Boshoku Kabushiki Kaisha | vehicle seat |
-
1998
- 1998-12-28 JP JP10373204A patent/JP2000189289A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003045198A1 (en) * | 2001-11-26 | 2003-06-05 | Bridgestone Corporation | Seat pad for vehicle |
| CN100398037C (en) * | 2001-11-26 | 2008-07-02 | 株式会社普利司通 | Seat pad for vehicle |
| US7802853B2 (en) | 2004-12-28 | 2010-09-28 | Bridgestone Corporation | Seat cushion pad for vehicle, seat back pad for vehicle, and seat for vehicle |
| JP2011218227A (en) * | 2004-12-28 | 2011-11-04 | Bridgestone Corp | Seat back pad for vehicle, and seat for vehicle |
| DE102015209062A1 (en) | 2014-05-20 | 2015-11-26 | Toyota Boshoku Kabushiki Kaisha | vehicle seat |
| US9637035B2 (en) | 2014-05-20 | 2017-05-02 | Toyota Boshoku Kabushiki Kaisha | Vehicle seat |
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