Patent ID: 6769884
Filing Date: 2004-08-03
Classification: F04B

Abstract:
A hydraulic drive system utilizing pressured hydraulic fluid for driving a reciprocating piston pump providing smoothed pumped output fluid flow comprising;a hydraulic drive cylinder incorporating a hydraulic piston having two sides and having a hydraulic piston diameter; a drive rod having a drive rod diameter connected to one of said sides of said hydraulic piston; a reciprocating pump having an inlet manifold and an outlet manifold and incorporating a pump piston having two sides and having a pump piston diameter; a piston rod having a piston rod diameter connected to one of said sides of said pump piston; means for directing the flow of pressured hydraulic fluid to one side or the other side of said hydraulic piston; wherein said drive rod is connected to said piston rod whereby when said pressured hydraulic fluid is directed to one side or the other side of said hydraulic piston said hydraulic piston reciprocates in a controlled manner thereby driving said reciprocating pump; wherein said reciprocating pump has pump a piston displacement ratio related to said pump piston diameter and said piston rod diameter; wherein said hydraulic drive cylinder has a hydraulic pump piston displacement ratio related to said hydraulic piston diameter and said drive rod diameter; wherein said hydraulic piston displacement ratio is matched to said pump piston displacement ratio and wherein said matching of said displacement ratios provides a sinusoidal output flow characteristic for said pump.