CN1076276C - 带密封剂的轮胎内胎的制造方法 - Google Patents

带密封剂的轮胎内胎的制造方法 Download PDF

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CN1076276C
CN1076276C CN96192139A CN96192139A CN1076276C CN 1076276 C CN1076276 C CN 1076276C CN 96192139 A CN96192139 A CN 96192139A CN 96192139 A CN96192139 A CN 96192139A CN 1076276 C CN1076276 C CN 1076276C
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山际登志夫
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Abstract

用挤压成形法成形出内部被隔壁5分隔成空气室3和密封剂室7的内胎坯材2′，再切断成预定的长度，把与空气室连通的气门6安装在该内胎坯材2上后，将内胎坯材2′的两端部用压接接合，再使其硫化。在内胎坯材2′上形成与密封剂室7连通的密封剂充填孔41后，从气门6向空气室3内供给空气，挤压隔壁5而将空气从密封剂室7中赶出，在此状态下从密封剂充填孔41向密封剂室7供给密封剂8。把生橡胶片19粘贴在密封剂充填孔41上，进行硫化而闭塞该密封剂充填孔41。

Description

带密封剂的轮胎内胎的制造方法
[发明的领域]
本发明涉及带密封剂的轮胎内胎的制造方法，该内胎备有充填空气的空气室和充填密封剂的密封剂室。
[背景技术]
一般的带内胎轮胎，当内胎被钉子等刺破时，内胎内的空气从刺破口经过轮胎及内胎间的微小间隙，从轮辋的气门嘴孔等漏出到外部，成为所谓的“放炮”状态。
因此，现有技术中，提出了一种在内胎内预先注入适量液态密封剂的方案，当内胎被刺破时，该液态密封剂自动地应急修补刺破口(见日本专利公报特开昭58-74342号)。
但是，上述现有技术，是在成形内胎时，预先把充填着密封剂的密封容器放入内胎的内部，在成形后将该密封容器弄破，使密封剂充填到内胎内。因此，不仅在施加用于破坏密封容器的外力时，容易损伤内胎，而且，密封剂往往堵塞内胎的气门，或者在测定内胎内的空气压力时堵塞压力表。
为了解决此问题，只要把内胎的内部分隔成充填空气的空气室和充填密封剂的密封剂室，不使用密封容器，直接将密封剂充填在密封剂室内即可。
[本发明的揭示]
本发明是鉴于上述问题而作出的，其目的在于提供一种带密封剂的轮胎内胎的制造方法，该方法能有效地制造备有空气室和密封剂室的内胎。
为了实现上述目的，本发明的备有充填空气的空气室和充填密封剂的密封剂室的、带密封剂轮胎内胎的制造方法，其特征在于，具有以下第1至第5工序：
第1工序，用挤出成形法成形出在具有圆形断面的周壁的内部用隔壁分隔成空气室和密封剂室的内胎坯材；
第2工序，将内胎坯材的两端部接合而形成为环状；
第3工序，在周壁上形成连通密封剂室的密封剂充填孔；
第4工序，向空气室内充填空气，使隔壁与周壁紧密接触，由此完全排出上述密封剂室内的空气，在此状态下，从密封剂充填孔将密封剂充填到密封剂室内；
第5工序，将形成在周壁上的密封剂充填孔闭塞。
根据上述构成，由于用挤出成形法成形出在具有圆形断面的周壁的内部用隔壁分隔成空气室和密封剂室的内胎坯材，在从密封剂充填孔把密封剂充填到密封剂室后闭塞该密封剂充填孔，所以，可以不损伤内胎地分隔成空气室和密封剂室，可以防止密封剂堵塞气门及密封剂的泄漏等。另外，由于在空气室内充填着空气的状态下从密封剂充填孔把密封剂充填到密封剂室内，所以，在密封剂的充填之前，赶出密封剂室内的空气，可避免密封剂与空气混合。
在第4工序中，如果通过设在周壁的气门向空气室内充填空气，则不必在周壁上形成专用于充填空气的孔，可减少加工工作量。
在第5工序中，如果把生橡胶片粘贴在密封剂充填孔上，通过使该生橡胶片硫化而闭塞密封剂充填孔，则可以切实地闭塞密封剂充填孔，防止密封剂的泄漏。
[附图的简单说明]
图1是装着带内胎轮胎的车轮断面图。
图2是表示内胎制造工序的图。
图3是内胎坯材的横断面图。
图4是挤压成形机的局部立体图。
图5是图4的5方向的放大视图。
图6是接头装置的侧面图。
图7是图6中的7-7线放大视图。
图8是加热模的断面图。
图9是内胎坯材的其他断面图。
[实施本发明的最佳形式]
下面，说明本发明的实施例。
图1至图8表示本发明的一实施例。如图1所示，两轮摩托车用车轮的轮辋R通过钢丝辐条与轮毂(图未示)连接。在该轮辋R上装着带内胎轮胎T，该轮胎T由轮胎1和容纳在其内部的内胎2构成。内胎2备有断面为环形的周壁4，该周壁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。与周壁4成一体的隔壁5连接于把空气室周壁4i与密封剂室周壁4o相连接的一对连接部之间。
由空气室周壁4i和隔壁5围成的断面略圆形的空气室3内充填着空气，由密封剂室周壁4o和隔壁5围成的断面略圆弧形的密封剂室7内充填着公知的液态密封剂8。在空气室周壁4i上设有用于向空气室3充填空气的气门6。
内胎2的密封剂室7借助空气室3的空气压力而保持为沿着轮胎1内面的形状，所以，即使车轮旋转时的离心力作用于充填在密封剂室7内的密封剂8，也能防止该密封剂8偏向于内胎2的外周侧。因此，当钉子等从半径方向或侧向刺破内胎2时，密封剂8立即掩盖并修补刺破口，减慢空气从空气室3的泄漏。另外，由于密封剂保存在密封剂室7内，不流出到空气室3，所以，不会堵塞气门6及与气门相连接的压力表等。
下面，说明上述内胎2的制造方法。
如图2所示，内胎2的制造工序由材料混练工序、内胎坯材挤压成形工序、切断工序、气门安装工序、接头工序、第1硫化工序、开孔工序、密封剂充填工序、生橡胶片粘贴工序、第2硫化工序及检查工序构成。
先在内胎坯材挤压成形工序，把经过材料混练工序混练后的材料挤压成形，成形出由生橡胶构成的内胎坯材2′。如图3～图5所示，从挤压成形机11的管嘴12连续挤压成形的内胎坯材2′，备有横断面为圆形的周壁4和波形地连接位于周壁4上2点的隔壁5。即，周壁4以其与隔壁5的连接部为界，被分成空气室周壁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、隔壁5的长度Lc略相等。通过把隔壁5形成为波形，可以不产生急剧的弯折部，确保上述长度Lc。
挤压成形内胎坯材2′的挤压成形机11的管嘴12内部，设有用于分别向空气室3和密封剂室7供给·排出滑石粉等脱模剂的2个脱模剂排出口13、13和2个脱模剂吸入口14、14。由于被波形隔壁5分隔成的内胎坯材2′的空气室3和密封剂室7的断面积相等，所以，容易确保脱模剂排出口13、13和脱模剂吸入口14、14的配置空间。
接着，在切断工序把内胎坯材2′切断成预定的长度，再在气门安装工序把气门6安装在空气室周壁4i上的适当部位，再在接头工序将内胎坯材2′的两端部接合。
图6及图7表示接头工序所使用的接头装置。内胎坯材2′的两端部被由一对夹持部件15、16构成的夹具17挟持着，把稍稍伸出于夹持部件15、16的内胎坯材2′的两端面之间彼此压接。由硫化前生橡胶构成的内胎坯材2′被压接而接合成环形。
这时，必须把内胎坯材2′的一端空气室周壁4i、隔壁5及密封剂室周壁4o分别与内胎坯材2′另一端的空气室4i、隔壁5及密封剂室周壁4o对准接合，由上述夹具17挟持住，把隔壁5夹在空气室周壁4i与密封剂室周壁4o之间，形成为三层构造(见图7)。如前所述，由于空气室周壁4i的长度Li、隔壁5的长度Lc及密封剂室周壁4o的长度相等(见图3)，所以，空气室周壁4i、隔壁5及密封剂室周壁4o不被压缩或伸长，而是以自然长度的状态被挟持。这样，可防止空气室周壁4i、隔壁5或密封剂室周壁4o起皱，从而可切实地进行接合。
接着，在第1硫化工序，如图8所示，把上述内胎坯材2′插入加热模18内，从气门6向空气室3内供给加热的空气或高温水蒸气，使空气室周壁4i和密封剂室周壁4o密接加热模18，同时使隔壁5密接密封剂室周壁4o，在该状态下对加热模18加热，进行硫化。
接着在开孔工序，在内胎坯材2′的密封剂周壁4o上开设密封剂充填孔4l，然后在密封剂充填工序，从密封剂充填孔4l向密封剂室7内充填密封剂8。这时，在充填密封剂8之前，先从气门6供给空气，使空气室3膨胀，与图8所示状态同样地，使隔壁5密接密封剂室周壁4o，将密封剂室7内的空气完全排出，在该状态下开始充填密封剂8。这样，由于在完全排出密封剂室7内空气的状态下开始充填密封剂8，所以能切实防止空气混入密封剂8，可以只充填密封剂8。另外，由于利用气门6向空气室3内供给空气，所以，不必在空气室周壁4i上开设充填空气用的孔。
接着，在生橡胶片粘贴工序，粘贴生橡胶片19盖住密封剂充填孔4l后，在第2硫化工序，使生橡胶片19的附近局部硫化而闭塞密封剂充填孔4l，这样便完成了内胎2。由于采用与内胎坯材2′同一材料的生橡胶片19来闭塞密封剂充填孔4l，所以，能提高闭塞部的强度，切实防止密封剂8的泄漏。最后，在检查工序，检查已完成的内胎2后，制造工序便告结束。
上面描述了本发明的实施例，在不脱离本发明宗旨的范围内，可作各种设计变更。例如，挤压成形内胎坯材2′时，隔壁5的形状不限于实施例中的波形，也可以做成图9所示的其他波形。

Claims (3)

1.一种带密封剂的轮胎内胎的制造方法，该轮胎内胎备有充填空气的空气室和充填密封剂的密封剂室，其特征在于，具有以下第1至第5工序：
第1工序，用挤出成形法成形出在具有圆形断面的周壁的内部用隔壁分隔成空气室和密封剂室的内胎坯材；
第2工序，将内胎坯材的两端部接合而形成为环状；
第3工序，在周壁上形成连通密封剂室的密封剂充填孔；
第4工序，向空气室内充填空气，使隔壁与周壁紧密接触，由此完全排出上述密封剂室内的空气，在此状态下，从密封剂充填孔将密封剂充填到密封剂室内；
第5工序，将形成在周壁上的密封剂充填孔闭塞。
2.如权利要求1所述的带密封剂的轮胎内胎的制造方法，其特征在于，在上述第4工序中，通过设在周壁的气门向空气室内充填空气。
3.如权利要求1所述的带密封剂的轮胎内胎的制造方法，其特征在于，在上述第5工序中，把生橡胶片粘贴在密封剂充填孔上，通过使该生橡胶片硫化而闭塞密封剂充填孔。
CN96192139A 1995-12-26 1996-12-20 带密封剂的轮胎内胎的制造方法 Expired - Fee Related CN1076276C (zh)

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