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Joints and linkage Part 2

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JOINTS and LINKAGES A. Vania Politecnico di Milano, Dept. of Mechanical Engineering, Milan, Italy APPLIED MECHANICS – Prof. Andrea VANIA JOINTS prismatic joint helical joint 2 spherical 2D plane on plane hinge (or pin joint) spherical 3D APPLIED MECHANICS – Prof. Andrea VANIA JOINTS prismatic joint helical joint 3 splined shafts hub prismatic joint basic thread terms internal threadexternal thread screw bolt nut mating piece ridges or teeth APPLIED MECHANICS – Prof. Andrea VANIA JOINTS 4 free rotations free translations name degree of freedom sphere between parallel planes sphere in a cylinder cylinder between parallel planes spherical sphere in a cylinder with groove planar spherical with groove toric cylindrical cylindrical with groove rotoidal prismatic hinge (or pin joint) rigid jointpin joint in a bridge pillar joint APPLIED MECHANICS – Prof. Andrea VANIA FOUR-BAR LINKAGE 5 q s l p s + l < p + q s (a) Crank - rocker (b) Double - crank s + l < p + q sdriver driver Four-bar linkage: shortest link s, longest link l, intermediate length links p and q

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