Fluid pumping apparatus
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United States of America Patent
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May 11, 2004
Grant Date -
Jan 23, 2003
app pub date -
Sep 16, 2002
filing date -
Jul 25, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A pump has wobble pistons rigidly connected to arms of a nutating plate that is mounted on a bearing eccentrically mounted to a drive shaft by a counterweight. The piston assembly is nearly perfectly balanced by the counterweight due to its precisely defined moment of inertia and mass components. In particular, the counterweight produces a counter moment equal to the average moment produced by the piston assembly, preferably with a mass moment of inertia component corresponding to the average mass moment of inertia of the piston assembly. It also has a mass component providing a counter balance force opposing a radial force arising from the piston assembly having a center of gravity spaced from the shaft axis, and it has a mass component providing a counter balance moment opposing the moment arising from the counter balance force and the center of gravity of the piston assembly being spaced apart axially.
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