CN1060720C - 加入密封剂的轮胎内胎的制造方法 - Google Patents

加入密封剂的轮胎内胎的制造方法 Download PDF

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CN1060720C
CN1060720C CN97191143A CN97191143A CN1060720C CN 1060720 C CN1060720 C CN 1060720C CN 97191143 A CN97191143 A CN 97191143A CN 97191143 A CN97191143 A CN 97191143A CN 1060720 C CN1060720 C CN 1060720C
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sealant
chamber
inner tube
air
tyre
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CN1199364A (zh
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山际登志夫
槙坂升
日野俱克
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Inoue Industry Co Ltd
Honda Motor Co Ltd
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Honda Motor Co Ltd
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract

由隔离壁5将内部划分为空气室3和密封剂室7的内胎坯料2’的密封剂室周壁4o上具有与密封剂室7连通的空气排气孔4i。在加硫工序中，在把内胎坯料2’插入到加热模18内、然后将高温、高压气体供给于空气室3时，残留在密封剂室7内的空气从空气排气孔4i排出，可以将隔离壁5紧贴在密封剂周壁4o上进行切实的加硫。在从加热模18取出内胎坯材2’时，因为存在有空气排出孔4i，所以，密封剂室7不膨胀，隔离壁5不被过分地向空气室周壁4i侧拉伸，隔离壁5不带有膨胀癖部。

Description

加入密封剂的轮胎内胎的制造方法
发明的领域
本发明是关于加入密封剂的轮胎内胎的制造方法，该轮胎内胎备有空气室和密封剂室，空气室充填空气，密封剂室充填密封剂。
原有技术
一般的装有内胎的轮胎，其内胎受钉子等刺伤的情况下内胎内的空气从刺伤处，通过轮胎和内胎之间的微小间隙，再从车圈的管接头孔向外面漏出，很容易成为所谓的泄气状态。
因此，在内胎被刺伤的时候，预先在内胎注入适量的自动地应急修补该刺伤的液状的密封剂，这是大家都知道的(参照特开昭58-74342号公报)。在内胎成形之际，在该内胎的内部预先放入充填了密封剂的胶囊，成形后通过破坏胶囊而使密封剂充填在内胎之内，在施加外力破坏胶囊之际，有时不仅容易损伤内胎，也会堵塞内胎的空气阀，在测定内胎的空气压力时还会堵塞压力计。
为避免上述问题，有人考虑了在内胎的内部由隔离壁划分成充填空气的空气室和充填密封剂的密封剂室，不使用胶囊地直接在密封剂室里充填密封剂。
然而，在这样构造的加入密封剂的轮胎内胎的加硫工序中，把内胎坯料插入到加热模内，通过从空气阀向空气室供给加热了的空气或高温水蒸气，使空气室周壁和密封剂室周壁紧贴在加热模上，同时也使隔离壁紧贴在密封剂室周壁上，在这个状态下，加热加热模并进行加硫。这时，当插入加热模内的内胎坯料的密封剂室内残存着空气时，即使在空气室内供给了加热了的空气或高温水蒸气，隔离壁也不可能紧贴在密封剂室的周壁上，内胎坯料的加热有可能会不均匀。
另外，如上述那样地在密封剂室内残留着空气的状态下进行加硫时，当将内胎坯料从加热模取出时，封闭在密封剂室内的热膨胀了的空气会把分隔壁推压扩展在空气室周壁上，在隔离壁上形成膨胀癖部。当在分隔壁上带有这样的膨胀癖部时，在由钉子等刺伤密封剂室的周壁和隔离壁的场合，隔离壁向空气室周壁侧扩张，空气室内的空气流入到密封剂室侧，有可能减弱密封剂的效果。
发明的揭示
本发明是鉴于前述的情况而做成的，本发明的目的是：提供一种能切实地对内胎坯料加硫、在隔离壁上又不会带有膨胀癖部的加入密封剂的轮胎内胎的制造方法。
为了达到上述的目的，根据本发明的第1个特征，作为加入密封剂的轮胎内胎的制造方法，该轮胎内胎备有空气室和密封剂室，空气室充填空气，密封剂室充填密封剂。其特征是它具有六个工序，第1工序为内胎坯料的挤压成形工序，该内胎坯料的具有圆形截面的周壁的内部用隔离壁划分成空气室和密封剂室。第2工序为将内胎坯料在两端部接合为环状的工序。第3工序为在周壁上形成与密封剂室连通的排气孔的工序。第4工序为在把内胎坯料插入在加热模内的状态下，将高温高压气体供给于空气室内并进行加硫的工序。第5工序为往密封剂室里充填密封剂的工序。第6工序为堵塞排气孔的工序。
根据上述构造，因为通过用分隔壁将圆形剖面的周壁的内部分隔成空气室和密封剂室的内胎坯料被挤压成形，由排气孔向密封剂室充填密封剂之后堵塞该排气孔，所以能防止内胎的损伤，同时可切实地划分空气室和密封剂室，也能防止密封剂堵塞空气阀和密封剂的泄漏。另外，因为在内胎坯料的周壁上形成连通密封剂室的排气孔之后再把内胎坯料插入加热模进行加硫，所以将高温、高压的气体供给于空气室时，隔离壁能紧贴着周壁上而被均匀加热，所以能进行切实地加硫。而且，因为在分隔壁上不形成向空气室一侧扩张的膨胀癖部，在内胎受钉子等东西刺伤的时候，空气室的空气不会流入密封剂室，由此能充分地发挥密封剂的效果。
另外，根据本发明的第2个特征，提出了在上述第1个特征的基础上，以在上述第5工序中通过上述的放气气孔向密封剂室里充填密封剂作为特征的加入密封剂的轮胎内胎的制造方法。
根据上述构造，因为通过排气孔向密封剂室充填密封剂，所以就没有必要设置专门用于充填密封剂的孔。
另外，根据本发明的第3个特征，在上述第1个特征的基础上，加入密封剂的轮胎内胎的制造方法的特征为，上述第6工序是把生橡胶片贴在排气孔上的内胎坯料夹持在一对压接件之间进行压接的工序，上述一对压接件中的与生橡胶片一侧相反的一侧抵接的压接件的硬度设定得比内胎坯料的硬度低。
根据上述构造，贴在排气孔上的生橡胶片压接在内胎坯料之时，因为夹住内胎坯料的一对压接件中的与生橡胶片一侧相反的一侧抵接的压接件的硬度设定得比内胎坯料的硬度低，所以可以使生橡胶片沉入内胎坯料的内部，减小生橡胶片的周边与内胎坯料之间的台阶高差。由此，生橡胶片不仅难于被剥离，而且外观形状也美观。
附图的简单说明
图1～图11B表示本发明的第一实施例，图1为安装了放入了内胎的轮胎的车轮的横剖面图。图2为表示内胎的制造工序的图，图3为内胎坯料的横剖面图，图4为挤压成形机的部分斜视图，图5为图4的5方向的放大向视图。图6为接合器的侧视图，图7为图6的7-7线放大向视图，图8为加热模的剖面图，力9为在隔离壁上设有排气孔情况的作用说明图，图10A和图10B为生橡胶片附着工序的作用说明图，图11A和图11B为在分隔壁上带有膨胀癣情况的作用说明图，图12A和图12B为表示内胎坯料的其它实施例的图。
本发明的最佳实施例
下面，根据图1～图11B说明本发明的第1实施例。
如图1所示，机动二轮车用车轮的轮辋R通过车条与轮毂连接。在车圈R上安装着放入内胎的轮胎T，该轮胎T由轮胎1和内胎2构成，内胎2收容在轮胎1内。内胎2备有环状剖面的周壁4，周壁4备有位于半径方向内侧的空气室周壁4i和位于半径方向外侧的密封剂室周壁4o，连接周壁4的空气室周壁4i和密封剂室周壁4o的一对连接部之间，被与它们形成一体的分隔壁5相互地连接。
由空气室周壁4i和隔离壁5之间被划分成的剖面略呈圆形的空气室3内充填空气，在密封剂室周壁和隔离壁5之间被划分成的剖面略呈圆弧状的密封剂室内充填公知的液态密封剂8。另外，在空气室周壁4i上，设置了把空气充填到空气室3内用的空气阀6。
而且，内胎2的密封剂室7借助空气室3的空气压力保持着沿轮胎1的内表面的形状。即使在由车轮转动而产生的离心力作用在充填在密封剂室7内的密封剂8上也可以防止其密封剂8偏向于内胎2的外周侧，因此，内胎2即使受到钉子等从半径方向或者侧面方向的刺伤，密封剂8会马上地埋没并修补该刺伤处，从而减慢空气从空气室3漏出。另外，密封剂8被保持在密封剂室7内，由于它不会流出到空气室3侧，所以也不会堵塞空气阀6和贴在其上的压力计等。
下面，说明上述的内胎2的制造方法。
如图2所示，内胎2的制造工序由材料混匀工序、内胎坯料挤压成形工序、切断工序、空气阀安装工序、接合工序、开孔工序、第1次加硫工序、密封剂充填工序、生橡胶片附着工序、第2次加硫工序和检查工序构成。
首先，通过将在材料混匀工序中将混匀的材料在内胎坯料挤压成形工序中挤压成形，就成形了由生橡胶构成的内胎坯料2’。如图3～图5所示，从挤压成形机11的喷嘴12连续被挤压成形出的内胎坯料2’具有横剖面为圆形的周壁4和波形地连接位于周壁4的直径上的2点的隔离壁5。也就是周壁4以其与分隔壁5的连接部为界，分成空气室周壁4i和密封剂室周壁4o，空气室周壁4i的长度Li、密封剂室周壁4o的长度Lo、分隔壁5的长度Lc都设定为大致相等。由于隔离壁5形成波浪形，可以不会产生急剧的弯曲部地确保上述长度Lc。
在挤压成形内胎坯料2’的挤压成形机11的喷嘴12的内部、设置有2个脱模剂吐出口13，13和2个脱模剂吸引口14、14，吐出口供给滑石等脱模剂于空气室3和密封剂室7中，吸引口排出空气室3和密封剂室7中的滑石等脱模剂。通过由横断面为波形的隔离壁5将内胎坯料2’的空气室3和密封剂室7形成为相同的横断面积，可以很容易的确保脱模剂吐出口13、13和脱模剂吸引口14、14的配置空间。
在切断工序中按规定长度切断内胎坯料2’之后，在空气阀安装工序中在空气室周壁4i的适当地方安装空气阀6，接下来在接合工序中接合内胎坯料2’的两端部。
图6和图7表示在接合工序中使用的接合器。内胎坯料2’的两端由夹板17夹住，夹板17由夹板构件15、16构成。从夹板构件15、16中稍稍突出来的内胎坯料2’的两端面彼此相互压接。由加硫前的生橡胶形成的内胎坯料2’由上述的压接接合成环状。
这时，内胎坯料2’的一端的空气室周壁4i、隔离壁5和密封剂室周壁4o应该与另一端的空气室周壁4i、隔离壁5和密封剂室周壁正确结合，由上述夹板17把隔离壁5夹在空气室周壁4i和密封剂室周壁4o之间、而形成为三层(参照图7)，如上述，空气室周壁4i的长度Li、隔壁5的长度Lc和密封剂室周壁4o的长度Lo都被设定为等长度(参照图3)、空气室周壁4i、隔离壁5和密封剂室周壁4o不被压缩成伸长地在其自然长度状态下被夹住。因此防止了空气室周壁4i、隔离壁5和密封剂室周壁4o起皱，可以切实地进行其接合。
在接下来的开口工序中，在内胎坯料2’的密封剂周壁4o上开设连通密封剂室7的排气孔4l。
在接着的第一加硫工序中，如图8所示，把上述内胎坯料2’插入加热模18内，通过从空气阀6向空气室3内供给加热了的空气或高温水蒸气，使空气室周壁4i和密封剂室周壁4o紧贴在加热膜18上，同时使隔离壁5是紧贴在密封剂室周壁4o上，在这种状态下加热加热模并进行加硫。这时，即使在插入在加热模18内的内胎坯料2’的密封剂室内残留有空气，在因供给到空气室3的加热了的空气或高温水蒸气的压力使隔离壁5被挤压到密封剂室周壁4o侧时，残留在密封剂室内的空气从空气排气孔排出，隔离壁5能切实地紧贴在密封剂室周壁4o上。
因此，内胎坯料2’的整体被均匀加热并能切实地进行加硫。
假定在密封剂室4o上没有排气孔4l，如图9所示，即使在空气室3内施加压力，残留在密封剂室内的空气也会起妨碍作用，使分隔壁5不能紧贴在密封剂室4o上，内胎坯料2’的加热有可能不均匀。
在接下来的密封剂充填工序中，从排气孔4l向密封剂室7内充填密封剂8。这时，由于充填密封剂8之前先从空气阀6供给空气而使空气室3膨胀，与图8所示的状态相同地使隔离壁5紧贴在密封剂室周壁4o上，从而将密封剂室7内的空气完全排出，从这个状态开始充填密封剂8。这样，因为利用排气孔4l向密封剂室7充填密封剂8，所以没有必要设置充填密封剂8的专用孔。又由于是从完全排出了密封剂室7内的空气的状态开始充填密封剂8的，所以能切实地防止空气混入密封剂8中，能够只将密封剂8充填在密封剂室7内。又因为利用空气阀6向空气室3供给空气，所以没必要在空气室周壁4i上开设充填空气用的孔。
在接下来的生橡胶板附着工序中，覆盖在排气孔4l地附着生橡胶片19之后，通过在第二加硫工序中对生橡胶片19附近局部地进行加硫，并闭塞排气孔4l完成内胎2。若进一步说明生橡胶片附着工序的内容，则为：附着了生橡胶征19的内胎坯料2’的排气孔4l的周边用钢丝刷和砂纸等进行表面处理之后，去除作为钢丝刷和砂纸等刮下来的异物的内胎坯料2’的粉末和滑石，再用甲苯和橡胶溶剂等溶剂洗净该部分。接下来，在排气孔4l上附着直径20mm、厚度1．5mm的生橡胶片19，在160～170kg／m2的压力下加硫压着3～5分钟时间。代替上述用钢丝刷和金刚砂砂纸进行表面处理，可以采用由酸环化的方法、氯化的方法、夹杂二碘甲烷的方法、有机卤素化合物方法等其他公知的方法。
如图10A和图10B所示，加硫压着装置备有上下相对的下部压接件21和上部压接件22。在下部压接件21上使用比内胎坯料2’的硬度(JIS-A型，40～60度)低的低硬度的弹性材料(JIS-A型，20～40度)。作为上述的低硬度的弹性材料有硅酮橡胶，丁苯系橡胶(SBR)、苯乙烯-丙烯-二稀烃系橡胶(EPDM)、天然橡胶、腈基丁二烯系橡胶(NBR)、氯丁二烯系橡胶(CR)等等。
在金属制的上部压接件22内部设置了加热用的加热器23，在空气排气孔4l的周边附着了生橡胶片19的内胎坯料2’夹持在下部压接件21和上部压接件22之间进行压接。这时，接触于上部压接件22的生橡胶片19和它的周缘的内胎坯料2’用加热器23加热并加硫。
若下部压接件21用比生橡胶片19硬度高的金属制造，附着生橡胶片19的部分就会瘤状鼓起，通过将下部压接件的硬度形成的比内胎坯料2’的硬度低，贴着的生橡胶片19的周边部与内胎坯料2’的边界变为平滑，不仅生橡胶片19不易剥离，而且外观形状也美观。获得这种效果的理由被认为是由于在压接时生橡胶片19下面的下部压接件21与内胎坯料2’共同向下方凹陷，由此生橡胶片19沉入到内胎坯料2’的内部，生橡胶片19的周边部与内胎坯料2’之间的阶梯高差变小。
由于使用与内胎坯料2’同一材料的生橡胶片19堵塞排气孔4l，所以堵塞部的强度提高，能可靠地防止密封剂8的泄漏，这样，在检查工序中检查完成了的内胎2，就终止了制造工程。
在结束第一加硫工序、从加热模18取出内胎坯料2’时，假如不在内胎坯料2’上形成排气孔4l，由于没有排气孔4l密闭的密封剂室7内的压力由于其内部封入的残留空气的热膨胀而变高与此相对，空气室3的压力因加热空气或高温水蒸气被排出而成为大气压，其结果如图11A所示，由于密封剂室7膨胀，隔离壁5向空气室3侧压迫扩张，隔离壁5被过分地拉伸，隔离壁5上就带有要扩张到空气室3侧的膨胀癖病。
由这样的内胎坯料2’制造的内胎2的密封剂室周壁4o和隔壁5由钉子等刺伤的场合如图11B所示，由于通过膨胀癖部隔离壁5要向空气室3侧扩张，所以空气室3内的空气通过分隔壁5的刺伤处流入密封剂室7侧，密封剂8中混入空气，减弱了密封剂8的效果。但是，在本实施例中，由于在密封剂室周壁4o上形成了排气孔4l，从加热模18中取出的内胎坯料2’的密封剂室7不会因残留空气而热膨胀，所以可以切实地避免在分隔壁5上形成膨胀癖部。
以上详细叙述了本发明的实施例，本发明在不脱离它的要旨的范围内，可以进行种种设计上的变更。
例如，内胎坯料2’挤压成形时的隔离壁5的形状不局限于实施例的波浪形，也可以是图12A和图12B所示的其它的波浪形。

Claims (3)

1．加入密封剂的轮胎内胎的制造方法，它具有充填空气的空气室(3)和充填密封剂(8)的密封剂室(7)，其特征是，具有第1工序、第2工序、第3工序、第4工序、第5工序、第6工序。第1工序为挤压成形内胎坯料(2’)的工序，该内胎坯料(2’)的具有圆形截面的周壁(4)的内部由隔离壁(5)划分形成空气室(3)和密封剂室(7)；第2工序为在两端部把内胎坯料(2’)结合成环状的工序；第3工序为在周壁(4)上形成连通密封剂室(7)的排气孔(4l)的工序；第4工序为在内胎坯料(2’)插入加热模的状态下将高温、高压气体供给于空气室(3)并进行加硫的工序；第5工序为向密封剂室(7)内充填密封剂(8)的工序；第6工序为堵塞排气孔(4l)的工序。
2．如权利要求1所述的加入密封剂的轮胎内胎的制造方法，其特征在于：在前述第5工序中，通过前述排气孔(4l)向密封剂室(7)里充填密封剂(8)。
3．如权利要求1所述的加入密封剂的轮胎内胎的制造方法，其特征在于：前述第6工序是在前述排气孔(4l)上压接生橡胶片(19)的内胎坯料(2’)夹在一对压接件(21，22)之间进行加压的工序，前述一对压接件(21，22)中的与生橡胶板(19)一侧相反的一侧抵接的压接件(21)的硬度设定得比内胎坯料(2’)的硬度低。
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US20150084229A1 (en) 2013-09-25 2015-03-26 David Drew Morris Fabric and die design for divided conduit
JP6474225B2 (ja) * 2014-10-15 2019-02-27 株式会社ブリヂストン 空気入りタイヤ
WO2018017703A1 (en) * 2016-07-20 2018-01-25 Milliken & Company Process and extrusion die head for forming a divided conduit
JP7202544B2 (ja) * 2019-05-29 2023-01-12 株式会社オートネットワーク技術研究所 リアクトル

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TW336915B (en) 1998-07-21
WO1998008670A1 (fr) 1998-03-05
ID18144A (id) 1998-03-05
US6106647A (en) 2000-08-22
CN1199364A (zh) 1998-11-18
BR9706665A (pt) 1999-07-20

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