Gear drives with modified elliptical centrodes allows obtaining an asymmetric derivative function of the gear ratio. In this paper, the geometrical aspects of modification of elliptical centrodes as well as their analytical determination have been considered. A general equation for the center distance of modified elliptical gears that can be applied for conventional elliptical gear, oval gears, and gears with lobes has been derived. The results of application of modified elliptical gears to drive the crank member of a crank-slider linkage with the purpose of modification of the working and free-running cycles of a conventional crank-slider mechanism are presented. Two examples of tandem design of modified elliptical gears coupled with a crank-slider linkage have been considered.

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