Through studying the transmissiyefunctions of a type of two-gear crank mecha
nism
this paper presents a kind of two geared parallelogram mechanism which inputand output axes are coaxal
which rotativedirections are opposite and the angular speedratio is a constant;and presents the designmethods for the two -gear crank mechanismwith an instantaneous middle dwell or reversein sectional rotative angle or one - way rotanon at nonuniform speed.