The lengths of the links comply with the conditions: r/R=1/3, O͞A=R-r, O͞B=R, D͞F=F͞H=F͞E=E͞C/2. Gear 3 of radius r rolls inside fixed internal gear p-p of radius R and is connected by turning pair A to link 1 which rotates about fixed axis 0. Link 1 is connected by turning pair B to slider 5 which moves along cross-piece Dd of link 4. Link 4 is connected by turning pair D to gear 3 and its cross-piece t-t moves in slider 2 and in cross-shaped slider 7 which has guides with axes perpendicular to each other. Link 6 turns about axis 0 and moves in slider 7. Link 8 is connected by turning pairs D, F and E to links 4, 9 and 10. Links 9 and 10 are connected by turning pairs H and C to sliders 7 and 2. When link 1 rotates about axis 0, point C describes trifolium q-q with the equation p_c=O͞C=5r²+4r⁴cos(3ϕ) where ϕ is the angle between axis OA and axis Ox.
$1771$GL,Ge$