Fuel injection valve

Valves and valve actuation – Electrically actuated valve – Having element dimensionally responsive to field

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2391022, 239584, F16K 3102

Patent

active

047200774

ABSTRACT:
A fuel injection valve using a stacked piezoelectric ceramics displacement magnifying device as a valve actuator. The piezoelectric actuator comprises a stacked piezoelectric ceramics expandable upon application of an electric field thereto; a lever member having a base portion fixed to the central portion of the casing, an inner portion contacting with an end of the stacked piezoelectric ceramics and receiving an expansion force from the stacked piezoelectric ceramics, a fulcrum portion fixed to the base portion, and at least two outer portions adapted to be outwardly displaced when the inner portion receives the expansion force from the stacked piezoelectric ceramics; and a flexing member formed of an elastic material and connected at its both ends to the outer portions of the lever member under the condition where a central portion thereof is flexed frontwardly, the central portion of the flexing member being connected to a rear end of the valve body.

REFERENCES:
patent: 3614486 (1971-10-01), Smiley
patent: 4101076 (1978-07-01), Bart
SAE Technical Paper Series No. 800502, p. 10, FIG. 16.
Proceedings of the 5th Meeting on Ferroelectric Materials and their applications, (1985), 30-V-2, (including translation).

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