Fuel injection nozzle for internal combustion engines

Details Fuel injection nozzle for internal combustion engines Fuel injection nozzle for internal combustion engines

1991-11-20

1993-12-07

Mitchell, David M.

Fluid sprinkling, spraying, and diffusing

Fluid pressure responsive discharge modifier* or flow...

Fuel injector or burner

2395333, B05B 130, F02M 6104

Patent

active

052676943

ABSTRACT:
A fuel injection nozzle for internal combustion engines having a nozzle body secured on a nozzle holder, and a valve needle that is axially displaceable in the nozzle holder, the valve needle being raised from a valve seat for fuel injection by the fuel pressure, counter to a closing spring assembly of first and second helical compression springs disposed in series. The total stroke of the valve needle is divided into a prestroke and a remaining stroke. To attain an injection nozzle having the smallest possible outside diameter, the spring chamber receiving the closing springs comprises a blind bore of substantially constant diameter, on a bottom of which the first closing spring is supported. To support the second closing spring, a pressure shoulder part in the form of a ring is inserted into the blind bore; the pressure shoulder part is fixed by deformation of contacting parts of the wall of the nozzle holder. Recesses are machined into the circumference of the pressure shoulder part and for easier deformation of portions of the wall of the nozzle holder in the region of the pressure shoulder part, recesses are machined into the outer wall of the pressure shoulder part, with a portion of the wall of the nozzle holder forming the bottom being deformed to form a form-fitting connection with the recesses of the pressure shoulder part.

REFERENCES:
patent: 4403740 (1983-09-01), Eblen et al.
patent: 4768719 (1988-09-01), Straubel et al.
patent: 4848668 (1989-07-01), Andrews et al.
patent: 4856714 (1989-08-01), Turner
patent: 4962890 (1990-10-01), Shindo et al.
patent: 5040731 (1991-08-01), Yokoyama et al.

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