ELECTROHYDRAULIC NOZZLE FOR INTERNAL COMBUSTION ENGINE WITH ACCUMULATOR FUEL SYSTEM Russian patent published in 2004 - IPC

FIELD: mechanical engineering; internal combustion engines. SUBSTANCE: proposed electrohydraulic nozzle contains body with fuel feed and drain channels, hollow spray tip with nozzle orifices secured on body, needle, multiplicator, spherical lock, armature, rod and electromagnet. Valve seat and multiplicator sleeve are made separately. Sleeve is essentially through bushing with flange on end face from seat side. Seat is formed by at least two coaxial cylindrical steps with support flanges in between. One of step is arranged in sleeve space limiting control chamber by end face. Armature rod guide of normally closed valve is made in form of through bushing with flange. Armature rod is precision-mounted from one side in guide bushing, and second step of seat is mounted from other side to form additional overvalve chamber between their end faces. Flanges of said bushings are mated with support flange of seat and are fixed in axial space of body. Spherical lock is installed in additional overvalve chamber. Overvalve chamber communicates, through radial channel in wall of guide rod, with drain space located under magnetic circuit, and through central drain channel in seat, with control chamber. Hydraulic resistance of radial channel in rod guide exceeds hydraulic resistance of central drain channel in seat. Volume of additional overvalve chamber is less than volume of control chamber. End face of lock multiplicator limiting control chamber is made profile to provide closing of central drain channel in seat in upper position. Magnetic circuit of electromagnetic is provided with cooling grooves made on outer surface in parallel with its generatrix. Armature of electromagnet is formed by disk and rod made separately and interconnected by hub of return disk spring flexibly secured in ring groove found on rod. EFFECT: improved efficiency and provision of quick response of nozzle, reduced consumption of fuel for control. 6 cl, 9 dwg