ELECTROMAGNETIC VALVE FOR METERED OUT DELIVERY OF FUEL INTO INTERNAL COMBUSTION ENGINE Russian patent published in 2003 - IPC

FIELD: mechanical engineering; fuel equipment of internal combustion engines. SUBSTANCE: electromagnetic valve is made normally open. Fuel channel opens in space under needle. Force of spring acting onto needle is directed upwards to separate needle from guide seat. Force of spring acting onto armature is directed downwards pressing end face of its guide steam to end face of precision compensator spring-loaded (through needle) from below. Thrust part of precision compensator is inserted into inner slot of needle head forming axially movable joint. Armature stop is located below head of armature, and nonmagnetic material stop is located above armature head. Projection found on lower end face of armature is designed for limiting its downwards travel to make needle lower to its seat. Drain space is connected by corresponding channels with pocket of guide and with space where guide stem of armature thrusts against spherical end face of precision compensator. Relieving of seat and sealing face of needle from inertia forces caused by mass of armature is provided by relatively small overtravel of needle as compared with that of armature (not exceeding 25% of maximum travel of needle). Height of inner slot in needle head should exceed height of thrust part of precision compensator by value to guarantee excess of minimum difference in needle and armature travel. EFFECT: simplified design and improved reliability of valve, facilitated control of engine and enlarged possibility of control of fuel delivery by injector. 5 cl, 1 dwg