论文部分内容阅读
取代铸铁闸瓦的尝试多年来一直在进行。伦敦运输局使用合成闸瓦已经三十多年了,战后不久就在伦敦南部郊区列车上采用了高摩擦系数合成闸瓦(以下简称K闸瓦)。 K闸瓦与铸铁闸瓦相比具有寿命长,摩擦系数较稳定(速度在30公里/小时以上时摩擦系数K闸瓦一般为0.27,铸铁闸瓦为0.15),没有金属粉末飞扬和火花喷射等优点。诚然,K闸瓦的价格为铸铁闸瓦的3～4倍,但使用寿命却是铸铁闸瓦的4～5倍。摩擦系数稳定也很重要。在“正常”的轮
The attempt to replace cast iron brake shoes has been going on for years. For more than thirty years, the Transport Department of London has used synthetic brake shoes for more than three decades. Shortly after the war, trains with high frictional coefficients (hereinafter referred to as “K brake shoes”) were used on trains in the southern suburbs of London. Compared with cast iron brake shoe, K brake shoe has long life and relatively stable friction coefficient (friction coefficient K brake shoe is 0.27 at the speed of more than 30km / h, and cast iron brake shoe is 0.15), there is no metal powder flying and sparking jet etc. advantage. Indeed, the price of K brake shoe cast iron brake 3 to 4 times, but the service life is cast iron brake shoe 4 to 5 times. Friction coefficient stability is also important. In the “normal” round