Patent ID: 8328538
Filing Date: 2012-12-11
Classification: F04B,H02K

Abstract:
1. A dual rocking piston pump consisting of: a first piston assembly comprising a first connecting rod eccentrically mounted to a drive shaft, the first connecting rod comprising a first rod top coupled to a first retainer, the first rod top and first retainer having a first diameter, a second piston assembly comprising a second connecting rod eccentrically mounted to the drive shaft in equal opposition to the first piston assembly, the second connecting rod comprising a second rod top coupled to a second retainer, the second rod top and the second retainer having a second diameter that is different than the first diameter, the first and second connecting rods having identical masses despite a difference in the first and second diameters, the first and second retainers having identical masses despite the difference in the first and second diameters, wherein moments acting on the drive shaft from the first and second piston assemblies are in equilibrium without coupling inertia-increasing or inertia-decreasing elements to the drive shaft other than the piston assemblies, the first and second connecting rods comprise first and second openings respectively which accommodate first and second bearings, the drive shaft passing through the first and second bearings, the first and second bearings having masses that are equal, the first bearing accommodates a first eccentric element and the second bearing accommodates a second eccentric element, the first and second eccentric elements being mounted directly on the drive shaft, the first and second eccentric elements having masses that are equal and the first and second eccentric elements are unitary in structure.