Uniform rotation is transmitted from standard motor 1 through gearing to plate 2 of a friction drive and further, through roller 3 to disk 4. The speed of disk 4 is varied by electric motor 11 which turns cam 5 through worm gearing. Cam 5, by means of lever 6, carrying a segment gear and turning about fixed axis A, moves gear rack 7 which meshes with the segment gear and carries roller 3. Motion of roller 3 varies the transmission ratio of the friction drive and, consequently, the speed of disk 4. Rotation of disk 4 is transmitted through gearing to sun gear 8 which meshes with planet gear 9. Gear 9 is mounted on lever 10 which turns freely on the shaft of gear 8. Planet gear 9 also meshes with the internal teeth of gear 12, having twice as many teeth as gear 8. Gear 12 is driven by hydraulic motor 13 through a chain drive and a gear meshing with the external teeth of gear 12. The transmission ratio of the planetary mechanism is selected so that the angular velocity of gear 8 is twice that of gear 12 and the axis of planetary gear 9 is stationary. Upon a variation in speed of hydraulic motor 13, lever 10 turns and, through levers 14 and 15, shifts valve spool 16. Spool 16 controls fluid delivery to the cylinder with piston 17 which varies the delivery of hydraulic pump 18. To eliminate fluctuations of the valve spool upon deviations from the established speed, levers 19 and 20 close the valve.
$4033$THP,Dr$