周 上泽文通大￥ Transformations of PKC Any ternary or higher order link can be partially shrunk to a lower- order link by coalescing nodes without any change in the DOF. 6 Complete shrinkage of a higher-order link is equivalent to its removal and DOF will be reduced. Shrunk link Shrunk link_ DOF=1 D0F=1 DOF=1 DOF=0 FIGURE 2-13 Link shrinkage 国 上帝充通大学 Transformations of PKC 比山 Crank-slider Guide -bar Slider is rocking Slider is stationa 曲柄-滑块机构 导杆机构 摇块机构 定块机构 6
6 ME357 Design & Manufacturing II Transformations of PKC 5 Any ternary or higher order link can be partially shrunk to a lowerorder link by coalescing nodes without any change in the DOF. 6 Complete shrinkage of a higher-order link is equivalent to its removal and DOF will be reduced. Transformations of PKC Crank-slider 曲柄-滑块机构 Guide-bar 导杆机构 Slider is rocking 摇块机构 Slider is stationar 定块机构
国 上浒充大￥ Transformations of PKC sin 0 Tangent Mechanism Sine Mechanism Elliptical Trammel Mechanism 正切机构 正弦机构 双转块机构 椭圆机构 国 上净文通大学 Important kinematic characteristics ©Limit position 极限位置 Time ratio 急回特性 © Transmission angle传动角 ©Toggle position死点 ME357 Design Manufacturing ll 7
7 Transformations of PKC Tangent Mechanism 正切机构 Sine Mechanism 正弦机构 双转块机构 Elliptical Trammel Mechanism 椭圆机构 ME357 Design & Manufacturing II Important kinematic characteristics Limit position 极限位置 Time ratio 急回特性 Transmission angle 传动角 Toggle position 死点