Patent ID: 7661935
Filing Date: 2010-02-16
Classification: F04B

Abstract:
1. An ultrahigh pressure pump, comprising: a frame including at least one radially-extending member having an outer frame pivot disposed at an outer end thereof; a crank rotatably mounted in said frame, said crank including a driveshaft having an input shaft adapted to be driven by a power source and a crankpin offset from a rotational axis of said crank; at least one radially-extending telescoping pump subassembly having inner and outer ends and including: a cylinder having an inner bore and a piston rod received in said inner bore, wherein said outer end is carried by said outer frame pivot so as to allow pivotal swinging movement of the pump subassembly about said outer frame pivot, and further wherein the inner bore is in fluid communication with a fluid flow discharge path that is not in fluid communication with any moving element boundary between the outer end of the pump subassembly and the outer frame pivot; and said inner end is pivotally attached to said crankpin, whereby said piston rod can reciprocate relative to said inner bore substantially without side loads thereupon; wherein said cylinder includes a liner assembly, comprising: a cylindrical inner liner which defines said inner bore; and a cylindrical outer liner surrounding said inner liner, wherein said outer liner is assembled to said inner liner with a preselected interference fit such that a compressive preload is present in said inner liner.