Variable injection hole type fuel injection nozzle

Details Variable injection hole type fuel injection nozzle Variable injection hole type fuel injection nozzle

1995-11-22

1996-12-31

Miller, Carl S.

Internal-combustion engines

Charge forming device

With fuel pump

123446, F02M 3704

Patent

active

055884121

ABSTRACT:
A nozzle is provided wherein the operation of injection hole groups is switched from one to another in accordance with the axial displacement of a spool valve. A nozzle body has a bottomed hole, and a plurality of injection hole groups are provided at different circumferential levels in the side wall of the bottomed hole, the injection holes at different circumferential levels being different in diameter from each other. The valve portion of the spool valve is urged by a spring so that the lower end of the valve portion abuts against the base of the bottomed hole in the normal condition. Moreover, a fuel passage communicates with one of the injection hole groups in the normal condition and communicates with the other injection hole group at a position where the valve portion is displaced axially against the spring force on receiving the pressure of pressurized fuel. In addition, braking means is used to fixedly hold both the axial positions of the spool valve, depending on the operating condition of an engine.

REFERENCES:
patent: 2003814 (1935-06-01), Taylor
patent: 4658824 (1987-04-01), Scheibe
patent: 4736712 (1988-04-01), Savkar
patent: 5020500 (1991-06-01), Kelly
patent: 5156132 (1992-10-01), Iwanaba
patent: 5163397 (1992-11-01), Pien
patent: 5484104 (1996-01-01), Kukler
Patent Abstracts of Japan, vol. 8, No. 201, (M-325), 14 Sep. 1984 & JP-A-59 090765, May 1984.

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