ELECTRICALLY CONTROLLED NOZZLE FOR INTERNAL COMBUSTION ENGINE Russian patent published in 2003 - IPC

FIELD: mechanical engineering; internal combustion engines. SUBSTANCE: proposed nozzle contains spray tip with needle valve and chamber to supply fuel at high pressure closed by needle valve and enclosing the needle valve, and resilient element pressing needle valve to seat of spray tip nozzle to be closed. Body of nozzle with high- pressure fuel feed channel communicates with constant high-pressure chamber, with low-pressure channel for leak-off fuel and central step bore to end of which spray tip adjoins from one side and in which resilient element is placed. Drive of needle valve includes electromagnet, armature installed in nozzle body bore from side opposite to spray tip and mechanical coupling member of needle valve and armature. Needle valve is provided with stop rigidly coupled with valve and made for engagement with stop of armature at working clearance of electromagnetic and is placed, together with resilient element, in high-pressure chamber consisting of two parts enclosing needle valve from both end faces and constantly coupled by its part from side of resilient element with low-pressure line through slot channel whose cross- section perimeter is equal to or smaller than perimeter of belt adjoining needle valve seat. Cross-section area of slot channel equals 0.04-2 areas of cross-section of diametral clearance along guide part of needle valve. Surface of slot channel is made separating, being arranged in nozzle body and it encloses part of coupling member of armature and needle valve. Said member is made with ratio of distance of working clearance of armature from needle valve to diameter of coupling member is section of separating surface equal to 20:1 or more. EFFECT: simplified design, improved dynamic parameters of nozzle at minimum cross sizes. 5 cl, 3 dwg