Porous plastic fuel filter for a fuel injector

Details Porous plastic fuel filter for a fuel injector Porous plastic fuel filter for a fuel injector

2006-02-14

2006-02-14

Hwu, Davis (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Including valve means in flow line

Reciprocating

C239S585300, C239S585500, C239S533200, C239S533120, C239S088000

Reexamination Certificate

active

06997404

ABSTRACT:
An improved filter assembly for a solenoid-actuated fuel injector having a fuel-resistant porous filter element in a filter retainer tube for disposition in the fuel tube of the fuel injector. Fuel flow through the filter element is axial. The filter retainer tube replaces the calibration tube in a prior art fuel injector, also acting as a seat for the injector spring and being positioned axially within the fuel tube by a press-fit calibration ring. The retainer tube is preferably formed of glass-filled nylon, and the filter element is preferably formed by injection molding of an open-cell polyamide foam. By selecting the porosity and flow characteristics of the filter element material in known fashion, the length and diameter of the filter element may be minimized, permitting reduction in the length and diameter of the fuel tube and also the size and cost of the actuating solenoid assembly.

REFERENCES:
patent: 3599796 (1971-08-01), Wilhelm
patent: 3767054 (1973-10-01), Farrow et al.
patent: 3795288 (1974-03-01), Pall
patent: 5876599 (1999-03-01), Sylvester et al.
patent: 6135094 (2000-10-01), Okada et al.
patent: 6328232 (2001-12-01), Haltiner, Jr. et al.
patent: 6434822 (2002-08-01), Perry et al.
patent: 6440305 (2002-08-01), Donnerdal et al.
patent: 3103723 (1982-09-01), None

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