CN102107587A - 短程线带束式轮胎 - Google Patents
短程线带束式轮胎 Download PDFInfo
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Abstract
一种充气轮胎具有一对胎圈、胎面、一对胎侧以及包括许多轮胎帘布层的胎体,所述轮胎具有一个或多个带束帘布层,其中至少一个所述的带束帘布层具有帘线,帘线由方程式ρ[cosα]n=K定义,其中ρ为从轮胎旋转轴线到胎体上一点的半径,α是所述点处所述至少一个帘布层的帘线角度,n为0.1至1之间的正实数,且K为常数。
Description
其它申请的交叉引用
本申请要求2009年12月23日提交的美国61/289777号临时申请的权益并以引用的方式合并入本文。
技术领域
本发明涉及轮胎制造和轮胎结构领域。
背景技术
短程线(测地线)轮胎(geodesic tire)是一种具有胎体帘线的轮胎,所述帘线遵循专门的数学定律:ρcosα=ρ0cosα0=常数。已经发现由短程线帘布层构成的轮胎具有独特的胎冠增长特性。根据轮胎的具体应用,可能需要采用一种专门的带束层组件来限制胎冠增长。除此之外,在某些轮胎应用中利用短程线带束层与子午线胎体可能是有优势的。因此基于上述原因,期望提供一种改进的方法和装置用于成型无上述缺陷的短程线轮胎。
定义
“高宽比”是指轮胎断面高度与断面宽度的比值。
“轴向的”和“轴向地”是指与轮胎旋转轴线平行的线或方向。
“胎圈”或者“胎圈芯”一般是指具有环形抗拉构件的轮胎部分,径向内胎圈将轮胎保持到轮辋上,轮辋被帘布层帘线包覆并成形,有或没有其他加强构件,如胎圈芯包布、切片包布、三角胶或填料、护趾胶和胎圈包布。
“斜交轮胎”是指胎体帘布层的加强帘线以相对于轮胎的赤道平面的约25-65°的角度斜对角地穿过轮胎从胎圈至胎圈延伸,帘布层帘线在交替层上以相反角度延伸。
“缓冲层”或者“轮胎缓冲层”与带束层或者带束层结构或者强化带束层意思相同。
“胎体”是指一层轮胎帘布层材料和其他轮胎部件。在胎体被硫化以产生模塑轮胎之前可向胎体中加入附加的部件。
“周向的”是指沿着垂直于轴线方向的环形胎面的表面周长方向延伸的线或方向;它也可以指各组相邻的环形曲线的方向,如截面图中所示的,这些环形曲线的半径确定了胎面的轴向曲率。
“帘线”是指包括纤维的加强线束之一,其用于加强帘布层。
“内衬层”是指形成无内胎轮胎的内表面且包含轮胎内的膨胀流体的一层或多层的弹性体或其他材料。
“衬垫”是指典型地用于增强零压行驶型轮胎胎侧的增强件;也指位于胎面之下的弹性体衬垫。
“帘布层”是指弹性体包覆的帘线的帘线增强层。
“径向的”和“径向地”指径向的朝着或远离轮胎旋转轴线的方向。
“胎侧”是指轮胎位于胎面和胎圈之间的部分。
“层压结构”是指未硫化的结构,其由一层或多层轮胎部件或者弹性体部件,如内衬层、胎侧以及任选的帘布层,组成。
附图说明
参照附图根据实例对本发明进行描述,其中:
图1是具有短程线帘线的轮胎胎体的透视图;
图2是胎冠区域中轮胎胎体的帘线的近视图;
图3是胎圈区域中轮胎胎体的帘线的近视图;
图4A所示为以短程线方式卷绕在轮胎坯件上的初始帘线;
图4B所示为多遍卷绕后卷绕在图5a的轮胎坯件上的帘线;
图5所示为各种短程线曲线;
图6所示为具有本发明所述的短程线帘线的轮胎胎体的正视图;
图7所示为图6中的胎体的侧视图;
图8和图9所示为图7中的胎体的胎圈区域的近视透视图;
图10-11所示为用于将帘布层敷设轮胎胚件上的装置的第一实施例;
图12所示为用于将帘布层敷设轮胎胚件上的装置的第二实施例;
图13所示为本发明的轿车轮胎的横断面视图;以及
图14所示为一种示例性的短程线束带层的透视图。
具体实施方式
具有短程线帘线的轮胎的横断面视图如图13所示。如图所示,轮胎300可以表示轿车轮胎,其包括一对对置的胎圈区域310,每个胎圈区域含有一个或多个嵌在其中的柱形胎圈320。与同样尺寸的轮胎相比,由于胎体构造,本发明的轮胎具有大大缩小的胎圈,下面将进行详细描述。轮胎300可进一步包括胎侧部分316,其沿着轮胎径向方向从各个胎圈部分312大致向外延伸。胎面部分330在胎侧部分316的径向外端之间延伸。此外,轮胎300通过从一个胎圈部分312到另一个胎圈部分312环形延伸的胎体340得到增强。带束层组件350设置于胎体330和胎面之间。带束层组件可以是标准带束层组件或者如下面详细描述的短程线带束层组件。
图1-3所示为本发明的轮胎胎体340,其中帘线呈短程线排列。如图2所示,一种尺寸为225 60R16的示例性轿车轮胎的胎冠部分341具有间隔开的帘布层,角度约为48°(其随着轮胎总尺寸变化而变化)。如图3所示,轮胎胎圈部分342具有间隔很紧密的帘线,帘线与胎圈相切。因此帘布层角度从胎圈芯到胎冠连续变化。任何表面上的短程线路径都是两点之间的最短距离或者最小曲率。在曲面上,如环面,短程线路径为直线。实际的短程线帘布层样式严格遵循数学方程式:
ρcosα=ρ0cosα0
其中,ρ为从芯部旋转轴线到某一给定位置处的帘线的径向距离;
α是某一给定位置处相对于中央圆周平面的帘布层帘线角度;
ρ0是圆周平面处从芯部旋转轴线到胎冠的径向距离,以及α0是相对于胎面中心线或者中央圆周平面的帘布层帘线角度。
图5所示为具有短程线帘线的轮胎的几种不同的帘布层路径曲线。一种短程线轮胎的公知实施例是子午线轮胎,如曲线4所示,其中帘线相对于圆周平面的角度α为90°。图5中的曲线1、2和3还示出了其他的短程线帘线构形。曲线1是短程线帘线形式的特例,其中帘线与胎圈圆相切,且本文中被称为轨道帘布层。图4A-4B所示为具有轨道帘布层构造的胎体340及各完成阶段。对图5中的曲线1应用下列方程式:
当ρ=ρ胎圈时,因为帘线与胎圈相切,角度α为0。
α=cos-1(ρ胎圈/ρ)
图6-9所示为本发明的未加工轮胎胎体的第一实施例。所示轮胎可作为轿车轮胎,但不限于此。胎体帘线以短程线轨道形式排列,其中帘线与轮胎的胎圈半径相切。帘线之间的紧密靠近导致胎圈区域中帘线材料的非常大的累积。为了克服这一固有缺陷,发明者修改了帘布敷层,下面将详细描述。
装置
本发明的第一实施例中,在环面形芯部或者轮胎胚料52上形成具有短程线胎体的轮胎300。芯部52可以是圆柱形,如轮胎成型鼓,但优选成型为非常符合轮胎的内部形状。如图10和11所示,芯部绕其旋转轴线可转动地安装。芯部为可拆卸的或者分段成型以便方便地从轮胎中移除。芯部还可包含内部加热器用于部分硫化芯部上的内衬层。
然后,芯部上敷设内衬层305。可通过齿轮泵挤出机使用橡胶带材或以板片形式敷设内衬层,或者通过本领域技术人员已知的传统方法来敷设内衬层。可选的胎圈,优选是4根或多根钢丝构成的柱胎圈320,可以在胎圈区域内敷设在内衬层之上。
然后,当芯部旋转时,具有一根或多根橡胶包覆的帘线2的橡胶带材在内衬层之上直接敷设到芯部上。根据本发明的装置100的透视图如图10-11所示。可以看出,装置100具有导向装置,所述导向装置具有机器人计算机控制系统110用于将帘线2放置到芯部52的环面上。机器人计算机控制系统110包括计算机120和预编程软件,该软件指令用于特定轮胎尺寸的帘布层路径。系统110的每个运动通过铰接连接实现精确运动。
机械手150安装在基座151上,具有优选的可沿六轴运动的机械臂152。机械臂152具有如所示相连的帘布层配置机构70。机械臂152按照预定路径10进给帘布层帘线2。计算机控制系统协调环面芯部52的旋转和帘布层配置机构70的运动。
帘布层配置机构70的运动允许凸曲率联接到胎圈区域附近的凹曲率,从而模拟轮胎的模制形状。
参照图11,示出了环面芯部52的横截面视图。如图所示,环面芯子52的每一侧56上的径向内部54具有凹曲率,其朝着环面芯子52的胎冠区域55径向向外延伸。随着凹形断面朝着上部胎侧部分57径向向外延伸,曲率过渡到凸曲率,另一种说法是环面芯子52的胎冠区域55。此横截面非常接近地复制轮胎的模制截面。
为使帘线2在指定的短程线路径10上前进,机构70可包含一个或多个辊子。示出两对辊子40,42,其中第二对辊42相对于第一对辊40成90°排列,且第二对辊42位于第一对辊40上方约1英寸的物理空间内,两对辊子间形成中心开口30,其使帘线路径10保持在这个中心内。如图所示,通过将帘线嵌入到预先涂敷到环形表面的弹性体复合物内和未硫化的复合物的表面胶粘性相结合,将帘线2保持在适当位置。一旦帘线2正确地围绕环形表面的整个圆周被施加,后续可使用弹性体面涂复合物(未示出)的层压来完成帘布层20的构造。
标准轮胎部件如胎圈包布、胎侧和胎面可应用于以传统模铸处理的胎体和轮胎。轮胎进一步可包括任选的面积与重量显著减小的胎圈。适于使用本发明的轮胎的胎圈的一个实例包括柱胎圈,所述胎圈重量比标准轮胎减小了2/3。
适用于将帘布层以短程线形式敷设到芯部上的装置的第二实施例如图12所示。该装置包括帘布层敷设头200,其绕Y轴可转动地安装。帘布层敷设头200可绕Y轴+/-100度范围内转动。为了将帘线敷设到胎肩和胎圈区域,帘布层敷设头200的转动是必要的。因此,帘布层敷设头200可在每一侧绕可旋转的芯部52转动以便将帘布层放置在胎侧和胎圈区域。帘布层敷设头200装配到支撑框架总成,其能够沿X、Y和Z轴平动。帘布层敷设头有一个出口202用于敷设一根或多根帘线2。帘线可以是带的形式且包括一根或多根橡胶包覆的帘线。与帘布层敷设头200相邻的是辊子210,其可绕X轴枢转安装,使得辊子可自由旋转以跟踪帘线轨迹。帘布层敷设头和压辊机构可由计算机控制器精确控制以确保帘布层的精确敷设。当敷设帘线时,轮胎芯部转动。轮胎芯部不连续地转动以便调准敷设头相对于芯部的运动的定时。帘布层敷设头和压辊装置专门适用于将帘线敷设到轮胎芯部的侧壁,且朝下到胎圈区域且包括胎圈区域。
带状橡胶包覆的帘线以遵循数学方程ρcosα=常数的模式敷设到芯部上。图5所示为具有短程线帘布层路径的帘布层曲线1、2和3。图中曲线2和3具有角度β,其为任一点处的帘布层与自身形成的角度。就本发明而言,帘布层角度β被选择为在严格大于90°到大约180°的范围。优选地,本发明的短程线路径(或轨道路径)为帘布层曲线2,其β约等于180°。对于帘布层曲线2来说,如果选择曲线上的某一点,如点A,则帘布层渐近点A的角度将等于大约180°。同样地,帘布层远离A点的角度也将约等于180°。因此对于曲线2上的任一点,帘布层渐近该点的角度和离开该点的角度均为约180°,优选地基本上为180°。
如图5所示,角度α0选择为使得帘线与胎圈相切。从点A开始,帘线与胎圈相切。图5中曲线1示出了从点A到胎冠中心点B的帘线路径,点B为拐点。帘线延续到轮胎的另一侧,其中帘线在点C处相切。重复该过程直到充分覆盖芯部。根据帘线尺寸和类型进行选择,帘线要绕转300至450圈以成型胎体。因为帘线在多个位置与胎圈相切,帘线在胎圈区域的累积形成胎圈。
如上所述,帘布层帘线以遵循数学方程ρcosα=常数的方式敷设到芯部上。使用芯部的三维网格数据点,可以确定满足数学方程ρcosα=常数的所有离散芯部数据点的计算。如图5所示,芯部的三维数据集合优选为X,Y,Ψ坐标。然后选择计算的起点。起点优选为图5中的A点,其为胎圈位置处芯部的切点。然后选择终点,终点优选为图5中的C点。与A点相比,点C代表轮胎相对侧的切点。然后计算从点A到点C的Ψ的变化。然后使用确定从点A到点C的最小距离的方法,由三维数据集合确定从起点A到终点C的理想帘线路径。优选地,可使用动态编程控制方法论,其中计算从点A到点C的三维最小距离。对从点A到点C的三维数据集合的所有可能路径来说,可使用计算机算法来计算各个距离,然后选择距离最小的路径。从点A到点C的距离最小的路径即为短程线路径。离散数据点存储到矩阵内,供计算机控制系统使用以确定帘线路径。然后从点C到下一切点重复该过程,并重复该过程直到胎体覆盖充分为止。
具有转位的短程线帘布层
本发明的一个变形中,除下述内容外,上述全部一样。带从第一条连续带的第一位置开始敷设,其严格遵照ρcosα=常数进行N圈旋转敷设。N为5到20之间的整数,优选为8到12,更优选约为9。绕转N圈后,对第二条连续带来说,带的起始点移动到与第一起始位置相邻的第二位置。带不被切断且保持连续,虽然带也可被切断并被转换到起始位置。重复上述步骤,直到充分的帘布层覆盖,典型地为绕转300或更多圈。发明者发现这一小调整对帘布层间隔更加均匀有帮助。
半径变化
在本发明的另一变形中,除下述内容外,均与上述内容相同。为了减小胎圈区域的累积,当时,半径ρ以Q圈的间隔在轮胎胎圈区域中沿径向方向增/减德尔塔(Δ)而变化。Δ的范围可从约2mm到约20mm,更优选为从约3mm到约10mm,最优选为从约4mm到约6mm。优选地半径以随机的方式变化。因此,例如,如果Q为100,则每绕转100圈,半径可增加约5mm,且第二个100圈,半径可缩短约5mm。
另一种改变半径的方法为在每个第Q圈时,半径被调整以使径向方向上切点递增地缩短伽玛(γ),其中γ从约3mm到约10mm变化。Q的范围可从约80到约150圈,优选地从约90到约120圈。因此例如,Q可约为100圈,且γ可约为5mm。因此,每绕转100圈,半径在径向方向上可缩短5mm。优选地,半径的变化可结合上述转位进行。
轴向变化
另一种变形中,除下述内容外,上述内容均与上述任一实施例描述相同。为了解决胎圈区域的累积,在胎圈区域中增加帘线轴向尺寸。因此,胎圈区域处的短程线方程存在偏差。在胎圈区域的临近范围内,其中ρ小于某个值,计算出新的X值用来解决胎圈区域中材料的累积。基于帘线厚度来计算新X值。可以使用二次方程来确定新X值。ρ和α值保持不变。
暂停变化(dwell variation)
另一变形中,除下述内容外,上述内容均与上述任一实施例描述相同。为了缩减胎圈区域处的累积,使用暂停角Ψ。因此,代替胎圈处有一个切点,角度Ψ停留大约5°左右或更小的小值,同时其他变量保持不变。暂停变化对于填充胎圈区域中帘线的间隙是有用的。
帘线结构
帘线可包括一根或多根橡胶包覆的帘线,其可为聚酯,尼龙,人造纤维,钢材,Flexten抗拉线绳或者芳族聚酰胺。
短程线带束层结构
具有上述短程线帘布层的胎体的胎冠区域可进一步包括短程线带束层350。短程线带束层位于轮胎胎面下方的胎冠部分。一层或多层短程线带束层可以敷设在短程线胎体或现有技术中的子午线胎体上。短程线带束层可以满足方程ρcosα=常数。带束层可使用上述加工方法敷设到胎体上。
一层或多层短程线带束层还可以具有如下的幂定律方程:
(1)ρ[cosα]n=常数,其中
(2)0<n<1
(3)常数=ρ0[cosα0]n
如果轮胎胎体是短程线的,优选地n在大约0.1至大约0.3的范围内。
根据本文提供的描述,本发明的变形是可能的。虽然为描述本主题发明给出了某些代表性的实施例和细节,但是对于本领域技术人员来说很明了的是,在不脱离本主题发明的范围的情况下,能够做出各种改变和修改。因此,可知,在所描述的特殊实施例中可做出变形,它们将在由所附权利要求限定的本发明的全部想要的范围内。
Claims (6)
1.一种充气轮胎,其特征在于,具有一对胎圈、胎面、一对胎侧以及包括多层轮胎帘布织物的胎体,所述轮胎具有一个或多个带束帘布层,其中至少一个所述带束帘布层具有帘线,所述帘线由方程式ρ[cosα]n=K确定,其中ρ为从轮胎旋转轴线到胎体上一点的半径,α是所述点处所述至少一个帘布层的帘线角度,n为0.1至1之间的正实数,且K为常数。
2.如权利要求1中所述的充气轮胎,其特征在于胎体具有径向帘线。
3.如权利要求1中所述的充气轮胎,其特征在于胎体具有一个或多个帘布层,所述帘布层满足方程式ρcosα=常数。
4.如权利要求1中所述的充气轮胎,其特征在于n等于0.1。
5.如权利要求1中所述的轮胎,其特征在于帘线是芳族聚酰胺。
6.如权利要求1中所述的轮胎,其特征在于帘线是聚酯。
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