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Abstract

A hydraulic pump having a pump cylinder closed at one end with an elongated piston arranged within the cylinder from the other end. The piston is constructed of a magnetostrictive material which increases in length in the presence of a magnetic field of appropriate intensity. It is wound along its length with a coil of wire capable of producing an electromagnetic field. The piston is fastened at the open end of the cylinder to define a cylinder cavity between the cylinder closed end and the piston. A pair of passages, including valves, an intake and an exhaust passage valve communicate with this cavity. The volume of this cavity is reduced when the piston expands under the influence of the magnetic field created by the coil to produce a pressure on any fluid contained within said cavity to force it out the exhaust passage to activate the hydraulic cylinder. In an alternate embodiment the piston is constructed of a magnetostrictive material which decreases in length in the presence of a magnetic field of appropriate intensity. In a further embodiment the cylinder is constructed of a negative magnetostrictive material which contracts or shrinks in length in the presence of a magnetic field. The volume of the cylinder cavity is reduced when the piston expands and the cylinder shrinks under the influence of the magnetic field created by the coil to produce a pressure on any fluid to force it out the exhaust passage.

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First Claim