清华大学：《机械原理》课程PPT教学课件（双语版）Chap 8 Combined Mechanisms

Chap. 8 Combined Mechanisms Chap 8.1 Classification Chap 8.2 Application Investigate and review by students

Chap.8 Combined Mechanisms Chap.8.1 Classification Chap.8.2 Application Investigate and Review by Students

Chap 8.1 Classification r Named by the sub-mechanisms r Named by the patterns of transmission route

Chap.8.1 Classification Named by the sub-mechanisms Named by the patterns of transmission route

Series combined mechanisms B Input output Mechanism I MechanismⅡ (link1,25) (link2,3,5) Output motions of one basic mechanism is the input motion of the next basic mechanism

Series Combined Mechanisms Mechanism Ⅰ (link 1,2,5) Mechanism Ⅱ (link 2,3,5) input output Output motions of one basic mechanism is the input motion of the next basic mechanism. 5

Parallel combined mechanisms The n Output motions of the B n single dof basic mechanism are input simultaneously to a basic mechanism with n Dof and 6 then combined to produce an F output Mechanism I input (link2,3,4,10 Mechanism III output MechanismⅡ (link4,59,8,10) (ink6,7,8,10

Parallel Combined Mechanisms input output Mechanism Ⅰ (link 2,3,4,10) Mechanism Ⅱ (link 6,7,8,10) Mechanism Ⅲ (link 4,5,9,8,10) The n Output motions of the n single DOF basic mechanism are input simultaneously to a basic mechanism with n DOF and then combined to produce an output. 10 9

Feedback Combined mechanisms a differential mechanisms has two doF In some differential 3 mechanism, one of the inputs 4 comes from the driver output directly. The other input is put Mechanism I the feedback from the output (ink 1, 2, 4) of the differential mechanism through the single doF MechanisnⅡl mechanism (link2,3,4)

Feedback Combined Mechanisms input output Mechanism Ⅰ (link 1,2,4) MechanismⅡ (link 2’,3,4) A differential mechanisms has two DOF. In some differential mechanism, one of the inputs comes from the driver directly. The other input is the feedback from the output of the differential mechanism through the single DOF mechanism. 4

Mixed combined mechanisms r A mechanism system formed through more than one combination pattern is called mixed combined mechanism 自由度大于1的差动机构称为组合机构的基础机构 自由度为1的基本机构称为组合机构的附加机构 所谓封闭式传动机构,是指用一个机构去约束或影 响另一个多自由度机构所形成的封闭式传动系统

Mixed Combined Mechanisms A mechanism system formed through more than one combination pattern is called mixed combined mechanism. 自由度大于1的差动机构称为组合机构的基础机构； 自由度为1的基本机构称为组合机构的附加机构。 所谓封闭式传动机构，是指用一个机构去约束或影 响另一个多自由度机构所形成的封闭式传动系统

Chap 8.2 Application 1. Complex path 2. Complex motion form B C 3 5

Chap.8.2 Application 1. Complex path 2. Complex motion form

Homework analyze the combining form 易对)

Homework Analyze the combining form