Cranks 1 and 3 of parallel-crank linkage ABCD rotate about fixed axes A and D. Gear 4 is rigidly attached to (or integral with) connecting rod 2 and meshes with gear 5 which rotates about fixed axis E. The dimensions of the links comply with the conditions: A͞B=D͞C=r, B͞C=A͞D and r₄+r₅=r, where r₄ and r₅ are the pitch radii of gears 4 and 5. The transmission ratio from crank 1 to gear 5 is i₁₅=ω₁/ω₅=r₅/r=r₅/(r₄+r₅)=z₅/(z₄+z₅) where ω₁ and ω₅ are the angular velocities of crank 1 and gear 5, z₄ and z₅ are the numbers of teeth of gears 4 and 5. Crank 1 and gear 5 rotate in the same direction.
$2415$LrG,5L$