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目前全国通用货车数量约有 5 4万辆以上 ,这些车辆一直使用铸铁闸瓦 ,已远远不能适应货车提速、重载的发展。在通用货车上改造制动系统推广高摩擦系数合成闸瓦 ,必须以最少的改造费 ,才能使高摩擦系数合成闸瓦得以顺利推广。该课题组经过长期大量研究 ,采用变比阀技术 (即在制动缸管中加入一套变更空气压力的比例阀 ) ,成功地解决了这一难题 ,并将这一技术和KZW 4G空重车自动调整装置结合在一起。由于高摩擦系数合成闸瓦的特性 ,可以使货车运行速度提高到 90km·h-1～ 10 0km·h-1时 ,制动距离为 80 0m或 110 0m ;重车制动缸压力为 2 6 0kPa或 36 0kPa时 ,空车制动缸压力仍是相同的 115kPa ,从而降低车辆日常维护费用及劳动强度。如果在通用货车上全部使用高摩擦系数合成闸瓦 ,仅仅闸瓦消耗一项 ,可节约费用约 3亿元人民币 ,而利用这些费用则可实现通用货车制动系统的改造 ,具有非常显著的经济效益及社会效益
At present, the number of general trucks in the country is about 54,000 or so. These vehicles have always used cast iron brake shoes and are far from being able to adapt to the development of speeding and overloading of trucks. In general trucks to transform the braking system to promote high friction coefficient of synthetic brake shoe, must be the least transformation fee, in order to make high friction coefficient synthetic brake shoe to be successfully promoted. The group after a long period of extensive research, the use of variable valve technology (that is, in the brake cylinder to add a set of air pressure to change the valve) successfully solved this problem, and this technology and KZW 4G empty weight Vehicle automatic adjustment device together. Due to the characteristics of brake shoe with high friction coefficient, the braking distance can be 80 0m or 110 0m when the running speed of the truck is increased from 90km · h-1 ~ 100km · h-1; the pressure of the heavy-duty brake cylinder is 26 0kPa or 36 0kPa, the empty brake cylinder pressure is still the same 115kPa, thus reducing the vehicle daily maintenance costs and labor intensity. If all the general trucks with high friction coefficient of synthetic brake shoe, brake shoe consumption alone can save about 300 million yuan, and the use of these costs can be GM truck braking system transformation, with a very significant economy Benefit and social benefit