DAMPED OPENING POPPET COVERED ORIFICE FUEL INJECTION NOZZLE

摘要

A poppet covered orifice fuel injection nozzle (5) for use in a direct injection type diesel engine has a spray tip (12) with a spring biased poppet valve (30) journaled for reciprocable movement therein, the lower reduced diameter free end of the spray tip and the head (31) of the poppet valve having opposed frusto-conical valve seat surfaces (22,33) with a differential angle of about 2 DEG so that seating engagement occurs at the outer peripheral edges thereof. The poppet valve has a fuel supply passage (35) extending through the stem (31) thereof for flow communication with a plurality of circumferentially spaced apart radial discharge orifices (36) that are inclined and located so as to discharge fuel parallel to and directly across the valve seat surface (33) of the poppet valve. A retainer (42) is sealingly fixed to the free stem end of the poppet valve and a damping piston (50) encircles the stem of the poppet valve in position to cooperate with the retainer for one-way damping of valve movement in a valve opening direction.