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为了提高列车速度,在提高牵引电机和发动机功率的同时,必须加大制动力。日本既有线上列车的制动距离规定为600m以内。因此,必须考虑提高闸瓦摩擦系数等,提出要开发高性能闸瓦。一、闸瓦种类机车和内燃动车的基础制动方式,由于动轴多难以采用盘形制动,故通常是采用车轮踏面的制动。踏面制动采用的闸瓦大致分为铸铁系、合成系和烧结合金系三大类。铸铁闸瓦对车轮的损坏性小,因此,长期以来一直被采用。但是,它在高速区域摩擦系数低以及磨耗大和更换频繁。合成闸瓦由于可通过改变铁粉、石墨等的成分比例在较大范围内确定摩擦系数,以及较铸铁闸瓦磨耗小等,在车辆高速化、延
In order to improve the train speed, it is necessary to increase the braking force while improving the power of the traction motor and the engine. Japan’s existing online train braking distance provisions for less than 600m. Therefore, we must consider increasing the friction coefficient of brake shoe, etc., proposed to develop high-performance brake shoe. First, the type of brake pads Locomotive and diesel-powered car based braking method, due to difficult to use multi-disc brake, it is usually the wheel tread brake. Brake brake tread used roughly divided into cast iron, synthetic and sintered alloy system of three categories. Cast iron brake shoes are less damaging to the wheels and have therefore been used for a long time. However, it has low coefficient of friction in high-speed areas and high wear and replacement frequency. As the brake shoe can be changed by changing the composition ratio of iron powder, graphite and other factors in a larger range to determine the friction coefficient, as well as more wear-resistant cast iron brake shoe, the vehicle speed, delay