Circular rotor 1 rotates about eccentrically located fixed axis A, coinciding with the geometric axis of housing 4. Rotor 1 is encircled by collar 2, having vane a which slides in bearing member 3. Member 3 is connected by a turning pair to housing 4. When rotor 1 rotates, liquid is delivered in the direction of the arrows. Vane a of collar 2 separates the suction and discharge chambers.
$3839$LHP,RP$