重庆大学：《机械设计》课程电子教案（课件讲稿）讨论课

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

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 Power Point或其他方式

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

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

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

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

Engineering Steel Chains „ Standard engineering steel chains „ Nonstandard chains

Silent chains Standard silent chains Nonstandard silent chains

Silent Chains „ Standard silent chains „ Nonstandard silent chains

Construction of Typical Roller chain Bushing Pin H Roller Pitch, Link plate

Construction of Typical Roller Chain

the effects of chordal Action Polygonal Action w,(Constant N=no teeth Driven Driver Vel. chain=rw cos 0° wn,(Constant) 中由由 Driven Driver We=, c05 8o 1b) Vel choin=ra, cos 8°

Polygonal Action the Effects of Chordal Action

注意 当链轮齿数z1减少,链条节距川增曾长时, 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)

注意 „ 当链轮齿数z1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）