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一、前言 60年代末,美国的轿车和轻型货车都使用鼓式制动器和石棉纤维增强的制动衬片,70年代初改为前轮盘式、后轮鼓式的制动装置。盘和鼓有不同的尺寸和结构,所用的标准材料是铸铁,而摩擦材料是复合材料,以酚醛树脂作为粘结剂,或者是酚醛树脂和橡胶并用。增强纤维有石棉、玻璃纤维、钢纤维以及其他有机纤维,还含有摩擦调节剂,
I. INTRODUCTION In the late 1960s, both American cars and pick-up trucks used drum brakes and asbestos-fiber-reinforced brake linings. In the early 1970s, they were replaced with front disc-type and rear-wheel drum brake units. The discs and drums are available in different sizes and configurations. The standard material used is cast iron, while the friction material is a composite material that uses phenolic resin as a binder or a combination of phenolic resin and rubber. Reinforced asbestos fibers, glass fibers, steel fibers and other organic fibers, also contains friction modifiers,