CN100546844C - 具有阻挡材料层的容器的构造 - Google Patents
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Abstract
本发明提供一种具有阻挡材料层的容器的构造,从而在通过吹塑成型模具的箍紧部在燃料箱等容器上形成凸缘,在该凸缘上贯通设置螺栓安装孔的构造中,能够减少来自螺栓安装孔的渗透燃料的排出量。燃料箱(1)的构造如下:该燃料箱通过吹塑成型形成;具有多层截面构造,该多层截面构造包括阻挡材料层(1C)、以及位于该阻挡材料层(1C)内外的内侧热塑性树脂层(1A)、外侧热塑性树脂层(1F);该燃料箱通过由模具的箍紧部形成的凸缘(2),用螺栓(B)安装在托架(4)上;在凸缘(2)上以多层截面形状被压缩的方式局部地形成薄壁部(5),并在该薄壁部(5)上贯通设置使螺栓(B)插入贯通的螺栓安装孔(3)。
Description
技术领域
本发明涉及一种安装在机动车上的燃料箱等的、具有阻挡材料层的容器的构造。
背景技术
关于安装在机动车上的燃料箱,基于防锈性或轻型化的观点,近年来,通过吹塑成型而形成的树脂制的类型已成为主流。在该树脂制的燃料箱中,为了抑制贮存在内部的汽油等燃料的渗透(主要是包含在燃料中的HC(碳氢化合物)的渗透),大多数的情况是壁部具有由EVOH(乙烯-乙烯醇共聚物)等构成的阻挡材料层,一般地,大多由多层截面构造的壁部构成,该多层截面构造具有阻挡材料层、以及夹持该阻挡材料层而形成在内侧和外侧的由PE(高密度聚乙烯)等构成的热塑性树脂层。例如,在专利文献1中记载有这样的多层截面构造的燃料箱,该多层截面构造具有HC阻挡材料层、以及夹持该HC阻挡材料层而形成的作为热塑性树脂层的热熔层。
专利文献1:日本专利文献特开2005-82013号公报。
作为将树脂制的燃料箱安装在车体上的现有技术,可以列举出这样的方法:在将燃料箱安装于车室下的地板下表面的情况下,将箍带挂在燃料箱的下表面,将载荷悬挂固定在整个燃料箱箱体上。但是,由于在该方法中还另外需要箍带部件,所以随着零部件个数的增加或重量增加的问题,作为燃料箱周围的空间,还必须确保箍带部件的配置空间。
对此,通过吹塑成型模具的箍紧部(pinch off部)在燃料箱的外表面侧一体地形成凸缘,在该凸缘上贯通设置螺栓安装孔,如果采用这样的结构,则不需要箍带部件等的固定部件,就能够通过凸缘只用螺栓来将燃料箱固定在车体上,从而可以期待解除上述问题。但是,在该构造中,贯通凸缘的螺栓安装孔的内周面露出到外部,换言之,形成在阻挡材料层的层间的热塑性树脂层的一部分露出到外部,从而存在渗透燃料从该露出的热塑性树脂层泄漏到外部的问题。
发明内容
本发明是为了解决该技术问题而进行的,本发明的目的在于提供一种这样的具有阻挡材料层的容器的构造,即,在利用吹塑成型模具的箍紧部在燃料箱等容器上形成凸缘,并在该凸缘上贯通设置螺栓安装孔的构造中,通过简易的结构就能够减少来自螺栓安装孔的渗透燃料的排出量。
本发明为解决上述课题,提供一种具有阻挡材料层的容器的构造,该容器通过吹塑成型形成;并具有多层截面构造,该多层截面构造包括阻挡材料层以及位于该阻挡材料层内外的热塑性树脂层;该容器通过由模具的箍紧部形成的凸缘,用螺栓安装在安装对象物上,该具有阻挡材料层的容器的结构特征在于,在所述凸缘上,以多层截面形状被压缩的方式局部地形成薄壁部,并且在该薄壁部上贯通设置使螺栓插入贯通的螺栓安装孔。
根据该构造,由于形成在阻挡材料层内侧的热塑性树脂层的露出面被形成在薄壁部上,因此,比起直接在凸缘的厚壁部穿通设置螺栓安装孔的构造,上述热塑性树脂层的露出面的表面积变小。由此能够减少在单位时间内从上述热塑性树脂层的露出面漏出的渗透燃料的排出量。
此外,在本发明中,具有阻挡材料层的容器的构造的特征在于,上述薄壁部通过吹塑成型时的吹塑成型模具形成。
根据该结构,由于能够在容器的吹塑成型时,同时形成薄壁部,因此,与从吹塑成型模具中取出容器后,再另外对薄壁部进行压缩加工的情况相比,提高了容器的生产率。
此外,在本发明中,具有阻挡材料层的容器的构造的特征在于,上述容器是安装在车体上的燃料箱;阻挡材料由EVOH构成;上述薄壁部中的阻挡材料层的间隔厚度尺寸被设定为0.5mm以下。
试验的结果是,在作为直径M8的螺栓用而使螺栓安装孔的直径约为8mm的情况下,如果将上述间隔尺寸设定为0.5mm以下,则已判明能够有效地抑制渗透燃料的排出量。而且通常,由于用作机动车的燃料箱的固定用的螺栓,从安装强度方面考虑,大多使用M8以上的,所以根据这一点,当在机动车的燃料箱中,阻挡材料由EVOH构成的情况下,如果使上述间隔尺寸为以M8的螺栓作为基准的值,即0.5mm以下的话,则能够有效地抑制渗透燃料的排出量。
根据本发明,能够通过简易的结构减少来自螺栓安装孔的渗透燃料的排出量。
附图说明
图1是燃料箱的局部外观立体图。
图2是图1中的A-A截面图。
图3是图2的要部放大图。
图4是表示薄壁部的形状变形例的侧截面说明图。
标号说明
1…燃料箱(容器)
1A…内侧热塑性树脂层
1C…阻挡材料层
1F…外侧热塑性树脂层
2…凸缘
3…螺栓安装孔
4…托架(安装对象物)
5…薄壁部
B…螺栓
具体实施方式
对将本发明应用对象的容器作为安装在机动车上的燃料箱的情况进行说明。图1是燃料箱的局部外观立体图;图2是图1中的A-A剖面图;图3是图2的要部放大图。燃料箱1是通过吹塑成型而形成的,在其侧壁部的外表面的一部分,通过模具的箍紧部沿着水平方向形成平板状的凸缘2。
如图2所示,燃料箱1的壁部的层结构从箱的内侧起依次为:热塑性树脂层(称为内侧热塑性树脂层1A)、粘接层(称为粘接内层1B)、阻挡材料层1C、粘接层(称为粘接外层1D)、再生层1E、热塑性树脂层(称为外侧热塑性树脂层1F)。因此,该层结构的多层型坯重叠而形成的凸缘2的层结构是,夹持内侧热塑性树脂层1A的各一对粘接内层1B、阻挡材料层1C、粘接外层1D、再生层1E、以及外侧热塑性树脂层1F。
内侧热塑性树脂层1A和外侧热塑性树脂层1F由彼此相同的材料构成,例如由热熔性和成型性等优秀的PE(高密度聚乙烯)形成。粘接内层1B和粘接外层1D由彼此相同的材料构成,例如由三井化学(社)制的ADMER(注册商标)等的粘接性树脂形成。阻挡材料层1C例如由对碳氢化合物具有优秀的不透漏性的EVOH(乙烯-乙烯醇共聚物)形成。再生层1E由回收燃料箱1成型时的毛刺等而得到的再生材料形成。
在凸缘2的中央部附近贯通设置有用于使螺栓B插入贯通的螺栓安装孔3,如图2所示,燃料箱1经由凸缘2由螺栓B和未图示的螺母紧固在车体侧的托架4(安装对象物)上。在这样的燃料箱1的安装构造中,也如在“背景技术”一栏中所述的那样,在螺栓安装孔3的内周面上,内侧热塑性树脂层1A(在本实施方式中,严格地说是,内侧热塑性树脂层1A和粘接内层1B)露出到外部,从而渗透燃料从该内侧热塑性树脂层1A和粘接内层1B的露出面泄漏到外部。
本发明的主要特征在于,在凸缘2上,以压缩多层截面形状的方式局部地形成薄壁部5,然后在该薄壁部5上贯通设置上述螺栓安装孔3。在本发明中,由于必要条件是薄壁部5以压缩凸缘2的多层截面形状的方式而形成,所以,例如通过锪孔加工等的切削加工而形成的薄壁部不包括在本发明内。本实施方式的薄壁部5的层结构,当然如上所述,由中央的内侧热塑性树脂层1A和各一对的粘接内层1B、阻挡材料层1C、粘接外层1D、再生层1E、外侧热塑性树脂层1F构成。
本实施方式中的薄壁部5在凸缘2的中央部附近形成为圆形。此外,在图2中,薄壁部5在凸缘2的板厚方向上的形成位置被表示为位于凸缘2的板厚中心部。螺栓安装孔3贯通设置在薄壁部5的中心部,当螺栓B插入贯通在螺栓安装孔3时,螺栓B的头部的下缘部(在本实施方式中,垫圈部Ba的下缘部),接触薄壁部5的周围的厚壁部。
作为形成薄壁部5的方法,大致可以分为如下两种情况:通过燃料箱1吹塑成型时的吹塑成型模具形成的情况(即,在吹塑成型模具的箍紧部形成薄壁部5用的凸部的情况);以及从吹塑成型模具取出燃料箱1后,通过另外准备的压缩加工工序来形成的情况。在采用后者的情况下,存在着如下问题:另外需要压缩加工的工序;以及由于在通过外部空气对材料进行冷却固化的基础上进行压缩加工,就要求大的压缩负荷等,在这一点上,前者的形成方法有利。
此外,作为贯通设置螺栓安装孔3的方法,也大致可以分为如下两种情况:通过燃料箱1吹塑成型时的吹塑成型模具形成的情况(即,在吹塑成型模具的箍紧部设置螺栓安装孔3用的销的情况);以及从吹塑成型模具取出燃料箱1后,通过另外准备的冲孔加工等工序形成的情况。前者不必另外设置工序即可完成,从而可提高生产性。
如上所述,在凸缘2上,以多层截面形状被压缩的方式局部地形成薄壁部5,在该薄壁部5上贯通设置用于使螺栓B插入贯通的螺栓安装孔3,若根据这样的结构,内侧热塑性树脂层1A和粘接内层1B的露出面形成在薄壁部5上,与直接在凸缘2的厚壁部上贯穿设置螺栓安装孔3的结构相比,能够减小内侧热塑性树脂层1A和粘接内层1B的露出面的表面积。由此,能够减少在单位时间内从内侧热塑性树脂层1A和粘接内层1B的露出面漏出的渗透燃料的排出量。
对于预定的螺栓安装孔3的孔径,为了进一步减小内侧热塑性树脂层1A和粘接内层1B的露出面的表面积,当然是将图3中的阻挡材料层1C之间的间隔尺寸L设定得小即可。试验的结果是,当作为螺径M8的螺栓B用而将螺栓安装孔3的直径设为约8mm的情况下,如果将上述间隔尺寸L设定为0.5mm以下,则已判明能够有效地抑制渗透燃料的排出量。
具体地,设置四处凸缘2,并分别贯通设置直径约8mm的螺栓安装孔3,当使各上述间隔尺寸L为0.5mm时,来自四个螺栓安装孔3的渗透燃料的总排出量为0.91mg(每天)。该数值容易满足美国加利佛尼亚大气资源局(CARB)的燃料类的挥发(燃料蒸发气体)的规定值。而且通常,用作机动车的燃料箱1的固定用的螺栓B,从安装强度的观点出发,大多使用M8以上的螺栓,因此,根据这一点,当在机动车的燃料箱1中,阻挡材料由EVOH构成的情况下,使上述间隔尺寸L为以M8的螺栓B为基准的值,即0.5mm以下,如果这样的话,能够基本有效地抑制渗透燃料的排出量。
以上,对本发明的最佳实施方式进行了说明。在本发明中,特别是对于薄壁部5的形状,可以进行适当的设计变更。例如,图4是表示簿壁部5的形状变形例的侧截面说明图,本变形例也满足如下要件,即:在凸缘2上以多层截面形状被压缩的方式局部地形成薄壁部5;在该薄壁部5上贯通设置上述的螺栓安装孔3。本变形例表示这样的结构,即:在凸缘2的一个面(图中为上表面)侧形成凹部7,以使得从凸缘2的另一面(图中为下表面)侧形成处于多层截面形状被压缩的状态的突出壁6,在该情况下,突出壁6构成薄壁部5。另外,突出壁6的形成也大致分为两种情况:通过燃料箱1吹塑成型时的吹塑成型模具形成的情况;以及从吹塑成型模具取出燃料箱1后,通过另外准备的压缩加工的工序形成的情况。
然后,通过切削加工等切除凹部7的底部8(在图4中用虚线表示),以形成螺栓安装孔3。在如上的结构中,也是由于在突出壁6的端面6a上,内侧热塑性树脂层1A和粘接内层1B的露出面的表面积变小,所以能够减少在单位时间内的渗透燃料的排出量。
此外,本发明中的容器并不仅限于安装在机动车上的燃料箱,只要是下述这样的构造,药品贮存用等的任何技术领域中都可以应用,该构造是:通过吹塑成型形成,具有包括抑制内部贮存物的透过的阻挡材料层、以及位于该阻挡材料层内外的热塑性树脂层的多层截面结构,并经由用模具的箍紧部形成的凸缘由螺栓安装在安装对象物上。
Claims (3)
1.一种具有阻挡材料层的容器的构造,该容器通过吹塑成型形成,并具有多层截面构造,该多层截面构造包括阻挡材料层和位于该阻挡材料层内外的热塑性树脂层,该容器通过由模具的箍紧部形成的凸缘,用螺栓安装在安装对象物上,所述具有阻挡材料层的容器的构造的特征在于,
在所述凸缘上,以多层截面形状被压缩的方式局部地形成薄壁部,并且
在该薄壁部上贯通设置使螺栓插入贯通的螺栓安装孔。
2.如权利要求1所述的具有阻挡材料层的容器的构造,其特征在于,
所述薄壁部通过吹塑成型时的吹塑成型模具形成。
3.如权利要求1或2所述的具有阻挡材料层的容器的构造,其特征在于,
所述容器是安装在车体上的燃料箱;阻挡材料由EVOH构成;所述薄壁部中的阻挡材料层的间隔尺寸被设定为0.5mm以下。
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US8381928B2 (en) | 2004-06-04 | 2013-02-26 | Ti Group Automotive Systems, L.L.C. | Multilayer fuel tank with a seam having an overlay for reducing vapor permeation |
DE502008002611D1 (de) * | 2007-03-21 | 2011-03-31 | Reinhard Feichtinger | Kraftstofftankanbauteil und verfahren zur herstellung eines kraftstofftankanbauteils |
US20090107565A1 (en) * | 2007-10-29 | 2009-04-30 | Textron Inc. | Fuel Tank |
FR2944335B1 (fr) * | 2009-04-14 | 2011-05-06 | Gaztransp Et Technigaz | Arret de la membrane secondaire d'une cuve de gnl |
US8617675B2 (en) * | 2009-12-15 | 2013-12-31 | Reinhard Feichtinger | Fuel tank attachment and method for producing a fuel tank attachment |
JP5495873B2 (ja) * | 2010-03-16 | 2014-05-21 | 株式会社Fts | 自動車用燃料タンク |
US20150217635A1 (en) * | 2013-02-07 | 2015-08-06 | Fts Co., Ltd. | Automobile fuel tank |
JP6184743B2 (ja) * | 2013-05-17 | 2017-08-23 | 八千代工業株式会社 | 樹脂製中空容器 |
FR3015921B1 (fr) * | 2013-12-27 | 2016-01-01 | Inergy Automotive Systems Research Sa | Procede de formation d'une goulotte de soudure sur une paraison pendant le soufflage d'un reservoir |
JP2016016794A (ja) * | 2014-07-10 | 2016-02-01 | 株式会社Fts | 自動車用の燃料タンクのフランジ部の製造方法 |
JP6137230B2 (ja) | 2015-04-02 | 2017-05-31 | トヨタ自動車株式会社 | 燃料タンクのフランジ部の成形装置及びその成形方法 |
JP6658562B2 (ja) * | 2017-01-16 | 2020-03-04 | トヨタ自動車株式会社 | 樹脂製燃料タンク及びこれを成形するブロー成形型 |
FR3082465B1 (fr) * | 2018-06-18 | 2020-06-05 | Continental Automotive France | Procede de detection d'un pincement ou d'une torsion d'un tuyau d'evacuation |
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