Round eccentric 1 rotates about fixed axis A. Ring gear 2 rotates about the geometric axis of eccentric 1 and meshes with internal gear 3 which rotates about fixed axis C. Pin a on gear 2 slides along slot b of link 4 which is connected by turning pairs G and N to links 5 and 6. Links 5 and 6 turn about fixed axes B and E. Link 4 slides along the hub of gear 2. When driving shaft d rotates at uniform velocity, gear 2 has circular translational motion and gear 3 rotates on shaft k about axis C at constant angular velocity. The lengths of the links comply with the conditions: B͞G=E͞N and G͞N=B͞E, i.e. figure BGNE is a parallelogram. The transmission ratio from shaft d to shaft k is i_dk=(z₃-z₂)/z₃ where z₂ and z₃ are the numbers of teeth of gears 2 and 3. Large transmission ratios can be obtained if there is a small difference between the numbers of teeth of the gears.
$2459$LrG,ML$