Patent ID: 8668466
Filing Date: 2014-03-11
Classification: F04B,Y10T

Abstract:
1. A variable displacement reciprocating pump comprising: a prime mover; an intermediate shaft directly or indirectly driven by said prime mover; a rotating rotary actuator directly or indirectly driven by said prime mover; a central shaft; at least one outer eccentric cam carried by said central shaft; at least one inner eccentric cam carried by said central shaft; wherein either said outer eccentric cam or said inner eccentric cam is fixed to said central shaft and wherein at least one central shaft gear is associated with the non-fixed eccentric cam; at least one intermediate shaft gear carried by said intermediate shaft, said intermediate shaft gear engaging said central shaft gear thereby providing a drivable connection between said prime mover and said central shaft; a crank end coupled to said outer cam; a plunger connected to said crank end by a connecting rod wherein said rotating rotary actuator directly or indirectly engages said central shaft thereby providing a drivable connection between said prime mover and said central shaft and wherein adjustment of said rotating rotary actuator provides for adjustment of said fixed eccentric cam relative to said non-fixed eccentric cam thereby adjusting the stroke of said plunger and the displacement of said pump.