Circular gear 1 rotates about fixed axis A and meshes with circular idler gear 2 which rotates about axis B of link 5. Gear 2 meshes with circular idler gear 3 which rotates about axis C of link 5. Gear 3 meshes with noncircular gear 4 which rotates about fixed axis D. The pitch curve of gear 4 is a symmetrical oval. Link 5 turns about axis A. When driving gear 1 rotates at uniform velocity, driven gear 4 rotates at nonuniform velocity. Gears 3 and 4 are held in mesh by the weight of gears 2 and 3 and link 5. The variation in the centre-to-centre distance C͞D is compensated for when link 5 turns about axis A.
$2453$LrG,ML$