Engine detonation sensor with double shielded case Patent #: 4096735
ApplicationNo. 06/918220 filed on 10/14/1986
US Classes:417/322, Magnetostrictive chamber310/26, Magnetostrictive417/410.1, Electric or magnetic motor417/505Electrically or magnetically actuated distributor
ExaminersPrimary: Croyle, Carlton R.
Assistant: Stout, Donald E.
Attorney, Agent or Firm
International ClassesF04B 17/00 (20060101)
F04B 53/10 (20060101)
AbstractA magnetostrictive 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 magneto-strictive 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 upon energization. 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, lead to a differential hydraulic actuator, for use as an intake and an exhaust passage to the actuator. The valve members in each cavity comprise a magnetically polarized member, each end of opposed polarity, such that upon energization of the pump with one polarity of pulses, the valves will assume a particular function, and with a reversed polarity of operating pulses, a reverse function. 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 a preferred embodiment the cylinder is constructed of a negative magneto-strictive material which contracts or shrinks in length in the presence of magnetic field.