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制动器可以看作是把汽车制动时的动能转化为热能的能量转换器。3吨的高级轿车,当以车速为50、100、200公里/小时制动时,制动器的热负荷分别为67.5、270和1080千卡。红旗牌高级轿车制动器由鼓式改为盘式结构以后,摩擦片的表面积减小了4/5～5/6,使单位面积上的摩擦力大大增加,摩擦所吸收的能量也相应增加。红旗牌轿车车速较高,当以150公里/小时制动时,其制动功率大约是发动机额定功率的四倍,可见制动器的热冲击是很大的,特别是连续制动时,对制动器的热冲击更为严重。由此可见,为了保证制动的安全性,采用摩擦性能稳定、热衰退性小的优质摩擦材料是非常必要的。
Brakes can be thought of as energy converters that convert the kinetic energy of a vehicle’s braking into heat. The 3 tonne limousine, when braking at speeds of 50,100,200 km / h, had brake thermal loads of 67.5, 270 and 1080 kcal, respectively. After the Hongqi limousine brake is changed from drum to disc structure, the surface area of the friction plate is reduced by 4/5 to 5/6, which greatly increases the friction force per unit area and increases the energy absorbed by the friction. Hongli brand cars speed is high, when the brake at 150 km / h, the braking power is about four times the engine rated power, we can see the brake thermal shock is great, especially in continuous braking, the brake Thermal shock is more serious. Thus, in order to ensure the safety of braking, the use of friction performance is stable, low thermal decay of good quality friction material is very necessary.