Chapter2StructureAnalysis positionofmachineMachine(机器)--mechanisms(机构)--links/parts(构件/部件)--machineelements(机器零件)ExampleofmachineShaper(牛头刨床)Crusher颚式破碎机 bustionengine(内燃机)positionofmachineMachineElements(机器零件)Rigidconnection(刚性联结)Links(构件)hain(运动链)Mechanism(机构)Assignframe,drivinglink(指定机架、主动件)Kinematicpairs(运动副)Links/parts(构件/部件)Linksarethebasickinematicelementsof ,anmachineelementisalinkandactsasanindependentunit。Machineelements(机器零件),gear,(运动副)Inordertotransmitandtransformmotions,–contactwithpointorlineCampair(凸轮副)Gearpair(齿轮副)Lowerpair–contactwithsurfaceSlidingpair(移动副)Revolutepair(joint)(转动副)TYPESOFKinematicandDOF(DegreeofFreedom)BasedonthetypeofcontactLowerpair:jointswithsurfacecontactHigherpair:jointswithpointorlinecontactxy*hain(运动链)Openloop(开环链)Closedloop(闭环链)Nameofdifferentparts/linksFrame机架(固定件)Drivinglink原动件(主动件、输入件)Drivenlink从动件,Outputlink(对外输出运动的从动件又可称为输出件,或执行构件executivepart)Connectinglink(中间传动构件)ypicalmechanisms(典型机构)Linkagemechanism(连杆机构)Gearandgeartrain(齿轮和齿轮系)Cammechanism(凸轮机构)monlyusedmechanism(binedmechanism(组合机构)
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