A Displacement Analysis of Spatial Four-Bar Mechanisms with Clearances and Tolerances

Abstract

About 36 kinds of spatial four-bar function-generating mechanism with a single degree of freedom between the drivers and followers, a systematic displacement analysis in consideration of clearances and tolerances has been carried out using four kinds of transformation functions and their derivatives with respect to kinematic parameters. Moreover, applying this method of analysis to a planar four-bar mechanism with offsets and clearances, the relations between planar mechanisms and spatial mechanisms have been discussed about the output errors.