Rotor 1 rotates about fixed axis A and has cylinder d in which piston 3 reciprocates. Piston 3 is connected by turning pair C to member 2 which rotates about fixed axis B. Owing to the eccentricity a between axes A and B of links 1 and 2, when rotor 1 rotates, piston 3 reciprocates with respect to rotor 1. This motion is used to pump a liquid.
$3823$LHP,RP$