JPH1033297A - Seat - Google Patents

Seat

Info

Publication number
JPH1033297A
JPH1033297A JP8215039A JP21503996A JPH1033297A JP H1033297 A JPH1033297 A JP H1033297A JP 8215039 A JP8215039 A JP 8215039A JP 21503996 A JP21503996 A JP 21503996A JP H1033297 A JPH1033297 A JP H1033297A
Authority
JP
Japan
Prior art keywords
seat
urethane foam
density
durability
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
Application number
JP8215039A
Other languages
Japanese (ja)
Inventor
Kunikazu Takiwaki
脇 邦 一 滝
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NHK Spring Co Ltd
Original Assignee
NHK Spring Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NHK Spring Co Ltd filed Critical NHK Spring Co Ltd
Priority to JP8215039A priority Critical patent/JPH1033297A/en
Publication of JPH1033297A publication Critical patent/JPH1033297A/en
Pending legal-status Critical Current

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  • Chair Legs, Seat Parts, And Backrests (AREA)

Abstract

PROBLEM TO BE SOLVED: To reduce the weight of an urethane cushion pad body while securing riding feeling performance by forming a cushion pad body composed of urethane foam by a urethane foam pad for which the density of a part excluding the under-hip part of a seat surface is lower than the density of the under-hip part and an impact resistance rate is high. SOLUTION: A seat cushion pad in the seat cushion 2 of this seat 1 is formed by the urethane foam and the part B excluding the under-hip part A of the seat surface is formed by the urethane foam of the density lower than the density of the under-hip part A and the high impact resistance rate. The use of the urethane foam of the high impact resistance rate reduces the hysteresis loss rate of a seat cushion pad material and the fatigue and distortion of the urethane foam pad body are reduced as a result. Especially by using the urethane foam pad body provided with the characteristics that the impact resistance rate is equal to or more than 75%, the compatibility of the durability of the seat, especially the seat for an automobile, and weight reduction is achieved.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、シートにおけるク
ッションパッド体が、座面の尻下部と、この尻下部以外
の部分とが異密度ウレタンフォームパッドで形成されて
なるシートに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat in which a cushion pad body of a seat is formed of a different-density urethane foam pad in a lower portion of a seat surface and a portion other than the lower portion of the seat.

【0002】[0002]

【従来の技術】従来、自動車等のシートにおけるクッシ
ョンパッド体のクッション材としては、モールドで発泡
されたウレタンクッション材が多く使用されている。従
来のシートにおけるクッションパッドは、全部が同じク
ッション材であるウレタンフォームパッドで形成されて
いる。これはシートクッションばかりでなく、シートバ
ックやアームレストについてもいえることである。
2. Description of the Related Art Conventionally, as a cushion material for a cushion pad body in a seat of an automobile or the like, a urethane cushion material foamed by a mold is often used. The cushion pad in the conventional seat is formed entirely of a urethane foam pad which is the same cushion material. This applies not only to seat cushions but also to seat backs and armrests.

【0003】[0003]

【発明が解決しようとする課題】クッション材はシート
の乗心地を決める重要な材料である。一方、最近は自動
車に対する低燃費の要求から、ウレタンクッション材の
軽量化、さらには低コスト化の面から、低密度化(重量
低減)の要求がある。
The cushioning material is an important material that determines the riding comfort of the seat. On the other hand, recently, there has been a demand for low density (weight reduction) from the viewpoint of reducing the weight of the urethane cushion material and further reducing the cost due to the demand for low fuel consumption of the automobile.

【0004】しかしながら、ウレタンフォームの低密度
化を図るためには次のような課題がある。 乗り心地性能が悪くなる。 耐久性が悪くなり、長時間使用すると、ヘタリ、歪で
シート形状がくずれ、表面に表皮たるみしわが発生す
る。
However, there are the following problems in reducing the density of urethane foam. Ride comfort performance deteriorates. The durability deteriorates, and if used for a long period of time, the sheet shape will be distorted due to settling and distortion, and the surface will have sagging and wrinkles.

【0005】本発明は、このような点に鑑み乗り心地性
能を確保しながら、ウレタンクッションパッド体の重量
低減を可能にしたシートを提供することを目的とする。
In view of the above, it is an object of the present invention to provide a seat capable of reducing the weight of a urethane cushion pad while securing ride comfort performance.

【0006】[0006]

【課題を解決するための手段】前記目的を達成するた
め、請求項1に係る発明は、シートにおけるウレタンフ
ォームよりなるクッションパッド体を、座面の尻下部を
除く部位が、尻下部の密度より低密度で、かつ反発弾性
率の高いウレタンフォームパッドで形成したことを特徴
とする。
In order to achieve the above object, the invention according to claim 1 is to provide a cushion pad body made of urethane foam in a seat, in which a portion of a seat surface except for a lower part of the seat has a lower density than a lower part of the seat. It is characterized by being formed of a urethane foam pad having a low density and a high rebound resilience.

【0007】また、請求項2に係る発明は、前記ウレタ
ンフォームパッドの反発弾性率が75%以上であること
を特徴とする。
The invention according to claim 2 is characterized in that the urethane foam pad has a rebound resilience of 75% or more.

【0008】[0008]

【発明の実施の形態】以下、本発明の一実施の形態につ
いて図とともに説明する。図1は本発明の実施の形態を
示す斜視図である。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the present invention.

【0009】同図において、シート1は、シートクッシ
ョン2およびシートバック3とより構成され、シートバ
ック3の頂部にはヘッドレスト4が設けられている。
In FIG. 1, a seat 1 includes a seat cushion 2 and a seat back 3, and a headrest 4 is provided on the top of the seat back 3.

【0010】シート1のシートクッション2におけるシ
ートクッションパッドは、ウレタンフォームで形成され
るが、座面の尻下部Aを除く部位B、例えば座面の前部
およびサイド部が、尻下部Aの密度より低密度で、かつ
反発弾性率の高いウレタンフォームで形成される。
The seat cushion pad of the seat cushion 2 of the seat 1 is formed of urethane foam, and a portion B of the seat except for a lower portion A of the seat surface, for example, a front portion and a side portion of the seat surface have a lower density of the lower portion A. It is formed of urethane foam having a lower density and a high rebound resilience.

【0011】ここで異密度構造としたのは、低密度化を
行うと、乗り心地が悪くなる傾向になるため、乗心地上
重要である尻下部Aより、乗り心地上あまり重要でない
パッド部位Bを、尻下部Aより低密度化したウレタン材
料を使用することで、乗り心地性能を確保しながら、ウ
レタンクッションパッド体の重量低減を図るためであ
る。
The reason why the different-density structure is adopted is that the lower the density, the lower the riding comfort tends to be. By using a urethane material having a lower density than that of the lower rear part A, it is possible to reduce the weight of the urethane cushion pad body while ensuring ride comfort performance.

【0012】また、座面の尻下部Aを除く部位Bの低密
度化部のウレタン材料としては、耐久性を確保するた
め、反発弾性率75%以上の特性を持つ材料が好まし
い。
As the urethane material for the low-density portion of the portion B excluding the lower portion A of the seat surface, a material having a characteristic of a rebound resilience of 75% or more is preferable in order to ensure durability.

【0013】反発弾性率の高いウレタンフォームを使用
することは、シートクッションパッド材のヒステリシス
ロス率を少なくすること(図2に反発弾性率の違いによ
るヒステリシスロス率の差を示す)であり、それにより
結果として、ウレタンフォームパッド体のへたり、歪を
少くできる。種々検討の結果、特に反発弾性率が75%
以上の特性を持つウレタンフォームパッド体を使用する
ことで、シート、特に自動車用シートの耐久性と軽量化
の両立が達成できることが判明したものである。
The use of urethane foam having a high rebound resilience means reducing the hysteresis loss rate of the seat cushion pad material (FIG. 2 shows the difference in the hysteresis loss rate due to the difference in rebound resilience). As a result, sag and distortion of the urethane foam pad body can be reduced. As a result of various investigations, especially the rebound resilience was 75%
It has been found that by using a urethane foam pad body having the above characteristics, it is possible to achieve both durability and weight reduction of a seat, particularly an automobile seat.

【0014】次に本発明の効果を示すために、評価試験
結果を図4および図5に示す。これは同一アルミ発泡型
モールドで、従来品、低密度品、本発明品の自動車用ウ
レタンフォームクッションパッドを作り、これらを同時
にそれぞれのパッド密度、硬度、ウレタンフォームの反
発弾性率、ウレタンフォーム素材の耐久性性能を示す湿
熱圧縮永久歪率と繰り返し圧縮残留歪率およびシートの
耐久性(試験前後の加圧板さがり)、乗り心地(6Hz
時伝達率)の評価試験をしたものである。
Next, in order to show the effect of the present invention, the evaluation test results are shown in FIGS. This is the same aluminum foam mold, to make the conventional product, low density product, urethane foam cushion pad for automobile of the present invention, and simultaneously use these pad density, hardness, rebound elastic modulus of urethane foam, urethane foam material Wet heat compression set and durability of repeated compression showing the durability performance, durability of the sheet (press plate before and after the test), ride comfort (6 Hz)
(Time transmission rate).

【0015】ここで乗り心地評価に6Hz時伝達率を用
いたのは、人の内蔵の共振点は4〜8Hzと言われてお
り、6Hzの伝達率が評価の代表値といえるからであ
り、乗員が不快にならないようにシートクッションの共
振点をずらして、6Hz時の伝達率を小さくする必要性
があることに起因する。
The reason why the transmission rate at 6 Hz is used for the evaluation of ride comfort is that the built-in resonance point of a person is said to be 4 to 8 Hz, and the transmission rate at 6 Hz can be said to be a representative value of the evaluation. This is because it is necessary to shift the resonance point of the seat cushion so as not to make the occupant uncomfortable, and to reduce the transmission rate at 6 Hz.

【0016】また、シートの耐久性評価は、JASO
B405の試験方法、シートの乗り心地評価は、JAS
O B408の試験方法にそれぞれ準拠し、図3に示す
試験機を用いてそれぞれ測定した。特に、耐久試験は、
JSAE 尻型を用い35万回の加振耐久を行った後の
加圧板下がり(試験前後の加圧板の上下方向の変位)で
評価を行った。また、図2には反発弾性率の違うウレタ
ンフォーム(70,80%)のヒステリシスロス差を表
した静荷重線図を示す。
The durability of the sheet was evaluated according to JASO.
The test method of B405 and the evaluation of the riding comfort of the seat are JAS
Each was measured using the tester shown in FIG. 3 according to the test method of OB408. In particular, the durability test
The evaluation was performed by lowering the pressing plate (vertical displacement of the pressing plate before and after the test) after performing the vibration endurance of 350,000 times using a JSAE buttocks. FIG. 2 is a static load diagram showing a hysteresis loss difference between urethane foams (70, 80%) having different rebound resiliences.

【0017】この評価試験の結果によれば、図4および
図5に示す通り、従来品を軽量化した低密度品では、耐
久性の目安となる繰り返し圧縮残留歪率が2.1%、湿
熱圧縮永久歪率が16%であり、従来品がそれぞれ1.
3%および12%であるから極端に悪くなり、また同時
に、低密度化に伴い耐久性(耐久試験前後の加圧板さが
り)、乗り心地性能(6Hz時の伝達率)共に悪くなっ
ている。
According to the results of this evaluation test, as shown in FIGS. 4 and 5, in the case of a low-density product in which a conventional product is reduced in weight, the repetitive compression set rate, which is a measure of durability, is 2.1%, The compression set is 16%.
Since they are 3% and 12%, they are extremely poor, and at the same time, the durability (the pressure plate before and after the durability test) and the riding comfort performance (transmittance at 6 Hz) are deteriorated due to the low density.

【0018】しかし、本発明品は、B部に低密度で反発
弾性率(78%)のウレタンを使用することで、繰り返
し圧縮残留歪率、湿熱圧縮永久歪率、耐久性、乗り心地
性能、などのどの項目についても殆ど悪くならない。ま
た、ヒステリシスロスも悪くならない。
However, by using urethane having a low density and a rebound resilience (78%) in part B, the product of the present invention can be used repeatedly to obtain a compression set, a wet heat compression set, durability, ride comfort, It is hardly bad for any items such as. Also, the hysteresis loss does not deteriorate.

【0019】因に、繰り返し圧縮残留歪率では、従来品
が1.3%であるのに対し本発明品はA部で1.3%、
B部で1.5%、湿熱圧縮永久歪率では、従来品が12
%であるのに対し本発明品はA部で12%、B部で8.
8%、耐久性では従来品が8mmであるのに対し本発明
品は7mm、乗り心地性能では従来品が0.71である
のに対し本発明品は0.69であり、殆ど悪くなってい
ないのが理解できる。
The repetition compression residual strain ratio of the conventional product was 1.3%, whereas that of the product of the present invention was 1.3% in part A,
In the part B, 1.5% was obtained.
%, Whereas the product of the present invention is 12% in part A and 8.8 in part B.
8%, the conventional product is 8 mm in durability, while the product of the present invention is 7 mm, and the ride quality is 0.71 of the conventional product, whereas the product of the present invention is 0.69, which is almost worse. I understand that there is no.

【0020】従って、低密度化にもかかわらず耐久性を
確保できた。一方、本発明品のA部は、乗り心地上重要
な部分であり、B部より高密度ウレタンフォームパッド
を使用することで乗り心地は悪くならない。その結果、
従来品より軽量化でき、従来品なみの性能を確保でき
た。
Therefore, the durability was ensured despite the lower density. On the other hand, part A of the product of the present invention is an important part in terms of riding comfort, and the riding comfort is not deteriorated by using a high-density urethane foam pad compared to part B. as a result,
Lighter weight than conventional products, and performance comparable to conventional products was secured.

【0021】[0021]

【発明の効果】以上詳細に説明した通り、請求項1にか
かる発明では、シートにおけるウレタンフォームよりな
るクッションパッド体を、座面の尻下部を除く部位が、
尻下部の密度より低密度で、かつ反発弾性率の高いウレ
タンフォームパッドで形成したので、乗り心地性能はも
ちろんのこと、繰り返し圧縮残留歪率、湿熱圧縮永久歪
率および耐久性等の性能を確保しつつ軽量化、低廉化で
きた効果を奏する。
As described above in detail, according to the first aspect of the present invention, the cushion pad body made of urethane foam in the seat is provided with a portion excluding the lower rear portion of the seat surface.
Made from a urethane foam pad with a lower resilience and lower resilience than the density of the lower back part, ensuring not only ride comfort but also performance such as repeated compression residual strain, wet heat compression set and durability. This has the effect of reducing the weight and cost.

【0022】また、請求項2にかかる発明では、前記ウ
レタンフォームパッドの反発弾性率を75%以上とした
ので充分の耐久性が確保できる。
Further, in the invention according to claim 2, since the rebound resilience of the urethane foam pad is 75% or more, sufficient durability can be ensured.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施の形態を示す斜視図である。FIG. 1 is a perspective view showing an embodiment of the present invention.

【図2】反発弾性率70%と80%のヒステリシスロス
差を示す静荷重線図である。
FIG. 2 is a static load diagram showing a difference in hysteresis loss between a rebound resilience of 70% and 80%.

【図3】乗り心地性能、耐久性の評価試験に使用する試
験機の説明図である。
FIG. 3 is an explanatory diagram of a test machine used for an evaluation test of ride comfort performance and durability.

【図4】評価試験結果を示す図表である。FIG. 4 is a table showing evaluation test results.

【図5】耐久性、乗り心地性能の評価試験結果を示す図
表である。
FIG. 5 is a table showing evaluation test results of durability and ride comfort performance.

【符号の説明】[Explanation of symbols]

1 シート 2 シートクッション 3 シートバック A 座面の尻下部 B 座面の尻下部を除く部位 DESCRIPTION OF SYMBOLS 1 Seat 2 Seat cushion 3 Seat back A Lower part of seat bottom B Excluding lower part of seat bottom

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 シートにおけるウレタンフォームよりな
るクッションパッド体を、座面の尻下部を除く部位が、
尻下部の密度より低密度で、かつ反発弾性率の高いウレ
タンフォームパッドで形成したことを特徴とするシー
ト。
Claims: 1. A cushion pad body made of urethane foam in a seat, and a portion excluding a lower rear portion of a seat surface,
A sheet formed of a urethane foam pad having a lower resilience than the density of a lower back part and a high rebound resilience.
【請求項2】 前記ウレタンフォームパッドの反発弾性
率が75%以上であることを特徴とする請求項1記載の
シート。
2. The sheet according to claim 1, wherein the urethane foam pad has a rebound resilience of 75% or more.
JP8215039A 1996-07-26 1996-07-26 Seat Pending JPH1033297A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8215039A JPH1033297A (en) 1996-07-26 1996-07-26 Seat

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8215039A JPH1033297A (en) 1996-07-26 1996-07-26 Seat

Publications (1)

Publication Number Publication Date
JPH1033297A true JPH1033297A (en) 1998-02-10

Family

ID=16665752

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8215039A Pending JPH1033297A (en) 1996-07-26 1996-07-26 Seat

Country Status (1)

Country Link
JP (1) JPH1033297A (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002153357A (en) * 2000-11-20 2002-05-28 Bridgestone Corp Vehicle seat cushion pad
JP2002300936A (en) * 2001-04-06 2002-10-15 Inoac Corp Seat pad for vehicle and manufacturing method therefor
JP2004147979A (en) * 2002-10-31 2004-05-27 Tokai Kogyo Co Ltd Cushion material for vehicle sheet
WO2004058473A1 (en) * 2002-12-24 2004-07-15 Bridgestone Corporation Polyurethane foam molding, method of producing the same, and seat pad for motor vehicle
AU2002300321B2 (en) * 1998-05-18 2005-05-19 Robert Andrew Crosbie Chair and seat cushion therefor
JP2005237483A (en) * 2004-02-24 2005-09-08 Tokai Kogyo Co Ltd Cushion body for vehicle seat
WO2005122834A1 (en) * 2004-06-15 2005-12-29 Bridgestone Corporation Seat cushion pad for vehicle, seat back pad for vehicle, and seat for vehicle
JP2006166987A (en) * 2004-12-13 2006-06-29 Toyo Tire & Rubber Co Ltd Seat cushion pad
JP2007117186A (en) * 2005-10-25 2007-05-17 Inoac Corp Car seat cushion and car seat
EP1832204A1 (en) * 2004-12-28 2007-09-12 Bridgestone Corporation Seat cushion pad, seat back pad, and seat for vehicle
WO2012043807A1 (en) * 2010-10-01 2012-04-05 日産自動車株式会社 Vehicle seat and stiffness setting method for vehicle seat
US8360530B2 (en) 2008-11-28 2013-01-29 Toyota Boshoku Kabushiki Kaisha Vehicle seat
JP2014024398A (en) * 2012-07-25 2014-02-06 Honda Motor Co Ltd Vehicle seat

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6274310A (en) * 1985-09-27 1987-04-06 株式会社イノアックコ−ポレ−ション Seat cushion and its production
JPH0252607A (en) * 1988-08-16 1990-02-22 Toyo Tire & Rubber Co Ltd Seat cushion and its manufacture

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6274310A (en) * 1985-09-27 1987-04-06 株式会社イノアックコ−ポレ−ション Seat cushion and its production
JPH0252607A (en) * 1988-08-16 1990-02-22 Toyo Tire & Rubber Co Ltd Seat cushion and its manufacture

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2002300321B2 (en) * 1998-05-18 2005-05-19 Robert Andrew Crosbie Chair and seat cushion therefor
JP2002153357A (en) * 2000-11-20 2002-05-28 Bridgestone Corp Vehicle seat cushion pad
JP2002300936A (en) * 2001-04-06 2002-10-15 Inoac Corp Seat pad for vehicle and manufacturing method therefor
JP2004147979A (en) * 2002-10-31 2004-05-27 Tokai Kogyo Co Ltd Cushion material for vehicle sheet
US7334278B2 (en) 2002-12-24 2008-02-26 Bridgestone Corporation Molded polyurethane foam product, seat pad for vehicle, and method for molding polyurethane foam product
WO2004058473A1 (en) * 2002-12-24 2004-07-15 Bridgestone Corporation Polyurethane foam molding, method of producing the same, and seat pad for motor vehicle
JP2005237483A (en) * 2004-02-24 2005-09-08 Tokai Kogyo Co Ltd Cushion body for vehicle seat
JP2012130815A (en) * 2004-06-15 2012-07-12 Bridgestone Corp Seat cushion pad for vehicle, and seat for vehicle
WO2005122834A1 (en) * 2004-06-15 2005-12-29 Bridgestone Corporation Seat cushion pad for vehicle, seat back pad for vehicle, and seat for vehicle
JPWO2005122834A1 (en) * 2004-06-15 2008-04-10 株式会社ブリヂストン Vehicle seat cushion pad, vehicle seat back pad, and vehicle seat
US7588296B2 (en) 2004-06-15 2009-09-15 Bridgestone Corporation Seat cushion pad for vehicle, seat back pad for vehicle, and seat for vehicle
JP2006166987A (en) * 2004-12-13 2006-06-29 Toyo Tire & Rubber Co Ltd Seat cushion pad
EP1832204A1 (en) * 2004-12-28 2007-09-12 Bridgestone Corporation Seat cushion pad, seat back pad, and seat for vehicle
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