INTERNAL COMBUSTION ENGINE HIGH-PRESSURE NOZZLE Russian patent published in 2003 - IPC

FIELD: mechanical engineering; internal combustion engines. SUBSTANCE: invention relates to fuel devices of internal combustion engines. Proposed fuel nozzle contains body with high-pressure fuel channel, low-pressure channel, central steeped bore and spray tip. Needle valve is placed in spray tip to separate high- pressure chamber and channel out of which atomizing channels come. Said valve is installed also for displacement to communicate-separate high-pressure chambers and atomizing channels. Elastic element is installed in nozzle body bore. Control chamber is coupled with high-pressure channel of nozzle body by limited cross section channel and with low- pressure channel by closed limited cross section channel. Device for hydraulic loading from needle valve control chamber in direction of action of elastic element are arranged coaxially in bore of nozzle body. Pressure electric control devices in control chamber include electric valve locking the chamber and installed at outlet of closed channel by which control chamber is connected with low-pressure channel. Second elastic element interacts with electric valve. Control chamber of needle valve loading hydraulic device is arranged at a distance from working clearance of electromagnetic armature being located at spray tip end face. Control valve is located closer to needle valve than to working clearance of electromagnet armature and it is coupled with armature by limited cross section link arranged coaxially in elastic element and fixed stop bore, ratio of length to minimum diameter of said stop being 15 and greater. Rigidly secured armature stop and movable stop of elastic element are mounted on ends of link being made with possibility of changing stop-to- stop distance at fastening. Fixed stop of control valve elastic element is made adjustable. EFFECT: reduced movable masses of nozzle elements, improved controllability of nozzle. 2 cl, 1 dwg