Eccentric 1 rotates about fixed axis A and is encircled by collar 3 which is connected by turning pair B to piston 7. Piston 7 slides in cylinder 6. Connecting rods 4 are connected by turning pairs E and D to collar 3 and to pistons 5 which slide in cylinders 8. Rotation is transmitted from the drive shaft, on which eccentric 1 is mounted, to the driven shaft, linked to cylinder block 2, through collar 3, connecting rods 4 and pistons 5. The working ends of the cylinders are connected together by passages in which flow-control valves 9 are installed. These valves vary the speed ratio.
$3973$LHP,C$