讨论课的任务 ?与带传动比较，链传动有哪些特点？ ?链传动产生运动不均匀的原因是什么？ ?链传动在国内外的应用情况； ?链传动应用实例分析。 要求及实施方法 ?每个班分三个组，选出组长； ?组长分配任务，查资料、讨论； ?每个组选2~3位同学为代表做Presentation； ?每个组大约10分钟（包括听众提问时间）； ?用PowerPoint或其他方式。 Presentation ? Tell them what you are going to tell them ? Tell them ? Tell them what you have told them 中英文对照 ? Roller chains are probably the most common and are used in a wide variety of low-speed to high-speed drives. ? Engineering steel chains are used in many low-speed, high-load drives. ? Silent chains are mostly used in high-speed drives. Roller Chains ? Standard roller chains ? Multiple-strand roller chains ? Double-pitch roller chains ? Nonstandard roller chains Engineering Steel Chains ? Standard engineering steel chains ? Nonstandard chains Silent Chains ? Standard silent chains ? Nonstandard silent chains Construction of Typical Roller Chain Polygonal Action the Effects of Chordal Action 注意 ?当链轮齿数z 1 减少，链条节距p增长时， 传动的不均匀性和附加动载荷也随之增 大； ?在承载能力足够的条件下，尽量选用小 节距单排链或小节距多排链（高速重 载）。