CN1110418C - 轮胎内胎制造装置 - Google Patents

轮胎内胎制造装置 Download PDF

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CN1110418C
CN1110418C CN99102492A CN99102492A CN1110418C CN 1110418 C CN1110418 C CN 1110418C CN 99102492 A CN99102492 A CN 99102492A CN 99102492 A CN99102492 A CN 99102492A CN 1110418 C CN1110418 C CN 1110418C
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山际登志夫
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    • B60C5/02—Inflatable pneumatic tyres or inner tubes having separate inflatable inserts, e.g. with inner tubes; Means for lubricating, venting, preventing relative movement between tyre and inner tube
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Abstract

本发明提供密封性能和耐久性均优的轮胎内胎。具有略圆形断面的周壁4内部，被隔壁5分隔为外周侧的密封剂室7和内周侧的空气室3，在密封剂室7内充填着密封材8；其特征在于，充填在上述密封剂室7内的密封材料8的直径方向的厚度为0.5至1.5mm。

Description

轮胎内胎制造装置
本发明涉及轮胎内胎及其制造装置，特别涉及备有充填空气之空气室和充填密封剂之密封剂室的轮胎内胎及其制造装置。
图1是车轮的横断面图，该车轮安装着带内胎轮胎，该内胎备有密封剂室。图5是表示内胎制造工序的图。图6是将内胎坯料挤压成形的挤压成形机的局部立体图。
如图1所示，机动两轮车用的车轮轮圈R通过钢丝辐条与轮毂(均未图示)连接。该轮圈R上安装着带内胎的轮胎T，该轮胎T由轮胎1和收容在其内部的内胎2构成。内胎2备有周壁4和隔壁5。周壁4由位于半径方向内侧的空气室周壁41和位于半径方向外侧的密封剂室周壁40构成。隔壁5把由周壁4包围的内部分成2部分。上述周壁4和隔壁5一体成形。
在由空气室周壁41和隔壁5包围的断面呈略圆形的空气室3中，充填着空气。由密封剂室周壁40和隔壁5包围的断面呈略圆弧形的密封剂室7中，充填着公知的液状密封剂8。在空气室周壁41上，设有向空气室3充填空气用的空气阀6。
内胎2的制造工序如图5所示，由材料混练工序、内胎坯料挤压工序、切断工序、空气阀安装工序和接合工序等构成。
先在内胎坯料挤压工序，用挤压成形机挤压在材料混练工序混练后的材料，成型为由生橡胶构成的内胎坯料2′。然后，在切断工序把内胎坯料2′切断为预定长度后，在空气阀安装工序，把空气阀6安装到空气室周壁41的适当部位，再在接合工序将内胎坯料2′的两端部接合。然后，经过硫化工序或密封剂充填工序，完成内胎。
如图6所示，在挤压成形机11的管嘴12上，设有分别向空气室3和密封剂室7供给、排出滑石等脱膜剂的脱模剂排出口14a、14b和脱模剂吸引口13a、13b。
向密封材料室7内充填的密封材料8的充填量多、使密封材料8的厚度t增厚，虽然可以提高轮胎的密封性能，但是，为了增加密封材料8的厚度而增加充填量，则轮胎内胎2的重量也增加，因此，轮胎内胎2与轮胎1的接触面的耐久性降低。
将密封材料8的直径方向厚度t作为参数，轮胎内胎2的耐久性和密封性能具有相背的性质，所以，密封材料室7内的密封材料8的直径方向厚度t，要考虑密封性能和耐久性两方面因素决定。但是，现有技术中，密封材料室7内的密封材料8的厚度t与密封性能及耐久性的关系未被充分认识，不能恰当地设定密封材料8的厚度，所以，不容易兼顾密封性能和耐久性。
上述的现有挤压成形机11中，分别从不同的脱模剂排出口14a、14b向空气室3和密封剂室7的区域排出滑石，但是付与排出压力的泵等排出机构，对于各脱模剂排出口14a、14b是共同的。因此，因某种外因当一方脱模剂排出口的排出负荷大于另一方脱模剂排出口的排出负荷时，泵的排出力集中在另一方脱模剂排出口。结果，从排出负荷小的一方的脱模剂排出口排出不必要的多量脱模剂，而排出负荷大的一方的脱模剂排出口，因得不到预定的排出压而造成排出量不足。
如图6所示，例如以排出口14a在上侧、排出口14b在下侧的状态挤压成形时，由于作用于内胎上重力的原因，上侧排出口14a的排出负荷大于下侧排出口14b的排出负荷。因此，从下侧排出口14b排出多量的脱模剂，而上侧排出口14a不能排出足够量的脱模剂。
本发明的第1目的是提供密封性能及耐久性均优的轮胎内胎。本发明的第2目的是提供轮胎内胎的制造装置，该装置能防止在硫化工序等中内胎周壁与隔壁粘接，提高制造成品率和耐久性。
为了实现上述目的，本发明有以下特征。(1)轮胎内胎，在外周侧备有充填密封剂的密封剂室，其中，密封剂室内的密封材料的直径方向厚度为0.5至1.5mm。(2)轮胎内胎制造装置，该制造装置用于挤压成形轮胎内胎坯料，该轮胎内胎坯料的具有略圆形断面的周壁内部，被隔壁分隔为外周侧的密封剂室和内周侧的空气室；其中，该制造装置备有管嘴面、第1脱模剂排出口、第2脱模剂排出口、第1排出机构、第2排出机构；
上述管嘴面上形成挤出轮胎内胎坯料周壁部的周壁用间隙和挤出隔壁部的隔壁用间隙；
上述第1脱模剂排出口在被上述隔壁用间隙的一方侧和周壁用间隙侧分隔的管嘴面上开口；
上述第2脱模剂排出口在被上述隔壁用间隙的另一方侧和周壁用间隙分隔的管嘴面上开口；
上述第1排出机构与第1脱模剂排出口连接；
上述第2排出机构与第2脱模剂排出口连接。
根据上述(1)，将密封材料的直径方向厚度t作为参数时，可在实际使用上满足在物理上相背的内胎耐久性和密封性能。
根据上述(2)，由于对各脱模剂排出口分别设置产生排出压力的排出机构，所以，例如即使第1脱模剂排出口的排出负荷增大，由第1排出机构提供的排出压力也不会从第2脱模剂排出口释放。因此，总能对第1脱模剂排出口提供预定的排出压。
上述第1及第2排出机构的加压力可以相同，也可以不同。
对附图简单说明如下：
图1是安装着轮胎的车轮横断面图，该轮胎的内胎备有密封剂室。
图2是表示耐久性与密封剂厚度关系的图。
图3是表示密封性能与密封剂厚度关系的图。
图4是本发明挤压成形机的断面图和管嘴正面图。
图5是表示内胎制造工序的图。
图6是挤压成形机的局部立体图。
下面，参照附图详细说明本发明。本发明者重新认识下述课题，即，在外周部备有密封剂室的内胎中，往密封材料室充填的密封材料量多、在直径方向加厚密封材料时，虽然能提高密封性能，但是由于密封材料室的重量增加，轮胎内胎2与轮胎1的接触面的耐久性降低；并对密封材料室内的密封剂厚度与密封性能的关系作了研究。
图2是表示内胎耐久性(纵轴)与密封剂厚度(横轴)关系的图。其中，采用可行驶距离作为耐久性的尺度，使密封剂的厚度每0.5mm地变化，测定在各种厚度下的可行驶距离。从实验结果可知，密封剂越薄，可行驶距离越长。
两轮车的轮胎本身的耐久性约1万公里，通常，在更换轮胎时也同时更换内胎。所以，内胎在实际使用上确保1万公里的耐久性即可，即使考虑到个体差，确保1.5万公里的耐久性也就可以了。根据图2的实验结果，如果密封剂的厚度设定在1.8mm以下，则可得到1万公里以上的耐久性，如果设定在1.5mm以下，则可得到1.5万公里的耐久性。
图3是表示内胎的密封性能(纵轴)与密封剂厚度(横轴)关系的图。其中，采用能被密封剂堵塞的孔径作为密封性能的尺度，使密封厚度每0.5mm地变化，测定在各种厚度下的可能被堵塞的孔径。从实验结果可知，加厚密封剂可提高密封性能。
产生泄气的最大原因，是钉子或尖状物贯穿轮胎并在内胎上扎孔所致，根据本发明者的调查，产生泄气的尖状物，其直径多为2至3mm，该尖状物在内胎上扎孔的直径约为6mm。根据图3的实验结果，如果把密封剂的厚度设定为0.5mm以上，则直径6mm的孔也能堵住。
因此，本实施例中，从轮胎内胎的耐久性与密封性能的观点，探究密封剂厚度的最适当范围。对于耐久性，虽然密封剂越薄耐久性越提高，但是从轮胎本身的耐久性看，加厚至1.5mm便可得到满足实际使用要求的耐久性。
另外，对于密封性能，虽然密封剂越厚密封性能越好，但是，从实际上在内胎上扎孔的孔径判断，密封剂减薄至0.5mm，就能满足使用要求的密封性能。
根据以上实验和研究结果，本实施例中，将密封剂的厚度设定为0.5至1.5mm。
如上所述，本实施例中，从轮胎内胎在实用上必须满足的耐久性和密封性能的观点出发，把密封材料的直径方向厚度定为0.5至1.5mm，所以在实际使用上可满足在物理上相背的耐久性和密封性能。
图4是表示本发明第2实施例即内胎挤压成形机构造的图，图(a)是用于挤出内胎坯料的管嘴的正面图，图(b)是图(a)的A-A线断面图。
在管嘴面上，设有挤出内胎坯料周壁部的周壁用间隙31和挤出隔壁部的隔壁用间隙32，还设有分别向空气室和密封剂室供给、排出滑石等脱模剂的脱模剂排出口14a、14b及脱模剂吸引口13a、13b。各脱模剂排出口14a、14b如图(b)所示，通过管路23、24分别与各自的脱模剂排出泵21、22连接。
这样，本实施例中，对于2个脱模剂排出口14a、14b分别独立设置作为滑石供给机构的脱模剂排出泵21、22，所以，即使一方脱模剂排出口增加管路阻力等排出负荷，该部分供给压力也不从另一方脱模剂排出口释放。因此，一方的脱模剂排出口，不受排出负荷影响地常时保持预定的供给压力，所以，可防止排出量的极端减少。
另外，各脱模剂泵21、22提供的脱模剂的供给压力不必相同，例如，当可以预测排出口14a的排出负荷大于排出口14b的排出负荷时，只要把脱模剂排出泵21的供给压力设定得高于脱模剂排出泵22的供给压力，就可以从各排出口14a、14b稳定地排出等量的脱模剂。
本发明具有以下效果。(1)从轮胎在实际中必须满足的耐久性和密封性能的观点，把密封材料的直径方向厚度定为0.5至1.5mm，所以在实际使用上可满足在物理上相背的耐久性和密封性能。(2)由于分别设有用于排出防止空气室周壁与隔壁粘接的脱模剂的排出机构和用于排出防止密封剂室周壁与隔壁粘接的脱模剂的排出机构，所以，例如即使一方脱模剂排出口的排出负荷增大，该排出机构提供的压力也不会从另一方脱模剂排出口释放。因此，各脱模剂排出口总保持预定的供给压力，可防止排出量的极端减少及过多。

Claims (3)

1.一种轮胎内胎制造装置，该制造装置用于挤压成形轮胎内胎坯料，该轮胎内胎坯料的具有略圆形断面的周壁内部，被隔壁分隔为外周侧的密封剂室和内周侧的空气室；其特征在于，该制造装置备有管嘴面、第1脱模剂排出口、第2脱模剂排出口、第1排出机构、第2排出机构；
上述管嘴面上形成挤出轮胎内胎坯料周壁部的周壁用间隙和挤出隔壁部的隔壁用间隙；
上述第1脱模剂排出口在被上述隔壁用间隙的一方侧与周壁用间隙侧分隔的管嘴面上开口；
上述第2脱模剂排出口在被上述隔壁用间隙的另一方侧与周壁用间隙分隔的管嘴面上开口；
上述第1排出机构把脱模剂加压供给上述第1脱模剂排出口；
上述第2排出机构把脱模剂加压供给上述第2脱模剂排出口。
2.如权利要求2所述的轮胎内胎制造装置，其特征在于，上述第1及第2排出机构的加压力不同。
3.如权利要求2所述的轮胎内胎制造装置，其特征在于，上述第1及第2排出机构的加压力相同。
CN99102492A 1998-03-04 1999-03-04 轮胎内胎制造装置 Expired - Fee Related CN1110418C (zh)

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