Piezoelectric actuator and a piezoelectric pump injector incorpo

Details Piezoelectric actuator and a piezoelectric pump injector incorpo Piezoelectric actuator and a piezoelectric pump injector incorpo

1984-09-26

1985-11-12

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310341, H01L 4108

Patent

active

045530599

ABSTRACT:
A piezoelectric actuator comprises a housing having an inside cavity in which is mounted a column of piezoelectric elements having interleaved electrodes. The column of piezoelectric elements is mounted within a sealed enclosure which divides the inside cavity of the housing into an inner space receiving the column of piezoelectric elements and an outer space. The inner space is filled with a flowable, electrically insulative, thermally conductive material such as silicone oil held in direct contact with and in a heat transfer relationship with the column of piezoelectric elements. The silicone oil serves to isolate the column of piezoelectric elements and the electrodes from moisture and other foreign materials that would otherwise affect an insulation breakdown voltage. A cooling liquid is adapted to be circulated through the outer space surrounding the enclosure to absorb heat transferred thereto from the column of piezoelectric elements through the flowable thermally conducting material. The piezoelectric actuator may be incorporated with a fuel injection nozzle to form a pump injector which pressurizes and injects fuel at each energization of the column of piezoelectric elements.

REFERENCES:
patent: 3194162 (1965-07-01), Williams
patent: 3461910 (1969-08-01), Selsam et al.
patent: 3495104 (1970-02-01), Burgo et al.
patent: 3501099 (1970-03-01), Benson
patent: 3598506 (1971-08-01), O'Neill
patent: 3700937 (1972-10-01), Rissolo
patent: 3822388 (1974-07-01), Martini et al.
patent: 4011474 (1977-03-01), O'Neill
patent: 4471256 (1984-09-01), Igashira et al.

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