対偶に遊びのあるスライダクランク機構の連接棒の形状決定

抄録

About slider-crank mechanisms with clearances, a dynamic design method has been discussed to determine directly the optimum shapes of connecting rods to prevent separations and collisions between pairing elements, after showing that the separations and collisions can be predicted simply from an exciting force of a model vibratory system with a mass, spring and dashpot which is derived from equations of motion of mechanisms with clearances. The results are as follows : (1) A dynamic analysis of slider-crank mechanisms with clearances has been carried out, the results of which are coincident with experimental ones. (2) A vibratory model has been derived from the equations of motion of slider-crank mechanisms with clearances. Separations between pairing elements have been shown not to occur if the exciting force of the model is constant with respect to time. (3) In order to obtain mechanisms with good dynamic performances, the shapes of their connecting rods have been determined by Simplex method with objective functions derived from the conditions where the above exciting forces become constant. No separations of pairing elements have been confirmed to occur theoretically and experimentally in the mechanisms with the optimized connecting rods.