Dimension relationship between spherical four-bar mechanisms with same couple curve

Abstract

In this paper, the harmonic component of the coupler curves of spherical four-bar mechanism is analyzed. The relationship between dimensions of spherical four-bar linkage and the harmonic component characteristic parameters of the coupler curve of the linkage is investigated. Based on the relationship, the three types of the spherical four-bar mechanisms which have the same coupler curve were discovered. These findings broaden the candidates for design from the results of a dimensional synthesis effort. The corresponding examples have also proved these conclusions.