Patent ID: 6604915
Filing Date: 2003-08-12
Classification: F04B

Abstract:
A hydraulic pump comprising:a diaphragm, a face plate coupled to and spanning across the diaphragm, and a smart material element, wherein the diaphragm further comprises a recess on a first side and a stiff face-seal surface surrounding the recess on the first side and wherein the diaphragm further comprises on a second side a center pedestal and a flexure means attached to the periphery of the center pedestal, and wherein the diaphragm and face plate coupled together form a chamber that is dynamically sealed by contact of the face seal surface against the face plate, and wherein the smart material element is positioned and constrained against the center pedestal such that extension and contraction of the smart material element deforms the diaphragm such that the chamber compresses and expands through compliance within the flexure means.