Patent ID: 8333571

Claim:
A pump, comprising: a housing; a rotatable body disposed within the housing and at least partially defining a plurality of barrels; a plurality of plungers associated with the plurality of barrels; a plunger engagement surface engaging the plungers; a base to which the plunger engagement surface is mounted, the base having a tilt axis about which the plunger engagement surface tilts; an actuator tilting the base such that the plurality of plungers reciprocate within the plurality of barrels as the rotatable body rotates; and geometry on the plunger engagement surface, wherein the rotatable body rotates the plurality of barrels and the plurality of plungers relative to the plunger engagement surface, and the geometry is such that undulations are present which enhance the reciprocation of the plurality of plungers and thereby reduce a flow pulsation of the pump, and wherein a number of the undulations present in the reciprocation of the plurality of plungers per rotation of the rotatable body is two times a number of the plurality of plungers when the number of the plurality of plungers is odd, and is equal to the number of the plurality of plungers when the number of the plurality of plungers is even.