圈上泽充大学 1.Two-Position synthesis GHA ILAO TONE:UNpin Problem:Design a fourbar Grashof crank-rocker to give 45 of rocker rotation with equal time forward and back,from a constant speed motor input. Draw O,B in two extreme Link 3 positions Draw chord B,B2 in either Link 2 direction Select point O2 Bisect B,B,and draw circle of that radius at O, Crank-O2A,Coupler AB, Rocker O2B,Ground O2O 02 64 0 Your choice 国 上久通大学 Two-Position synthesis 1.Grashoff non-quick return crank-rocker (b)Finished llnkage Link 3 Link 2 B> A 0 Link 4 Link I Link 3 77 1. Two – Position synthesis • Draw O4B in two extreme positions • Draw chord B1B2 in either direction • Select point O2 • Bisect B1B2 and draw circle of that radius at O2 • Crank-O2A, Coupler AB, Rocker O4B, Ground O2O4 45° Problem: Design a fourbar Grashof crank-rocker to give 45°of rocker rotation with equal time forward and back, from a constant speed motor input. 1. Grashoff non-quick return crank-rocker Two – Position synthesis