INTERNAL COMBUSTION ENGINE NOZZLE SPRAY TIP Russian patent published in 2000 - IPC

FIELD: mechanical engineering; diesel engines. SUBSTANCE: proposed spray tip has body 1 with taper seat 2 mated with well 3. Needle 4 placed in space of body 1 is provided with shutoff cone 5 and throttling cone 6 separated by ring groove. Shutoff cone 5 engages with seat 2, and throttling cone 6 is installed to form clearance with seat 2. Needle 4 has conical belt 8 forming locking edge 9 at intersection with shutoff cone 5. Additional cone 10 made on needle 4 forms throttling edge 11 at intersection with throttling cone 6. Diameter d_tc of throttling edge exceeds diameter d_w of well 3 and it is calculated by equation where C₁ and C₂ are lengths of generatrices of throttling and shutoff parts of surfaces of corresponding cones, d_oc is diameter of large base of throttling cone 6, d_os is diameter of larger base of seat cone, and d_le is diameter of locking edge. EFFECT: increased service life of spray tip. 1 dwg