NOZZLE FOR DIESEL ENGINE Russian patent published in 2002 - IPC

FIELD: mechanical engineering; fuel devices of internal combustion engines. SUBSTANCE: nozzle has body with hydraulically locking chamber supplied with fuel from feed channel communicating with under-needle space. Hydraulically locking chamber has drain channel with built-in electromagnetically controlled valve. Main throttle is installed in feed channel. Throttling unit and additional channel with auxiliary throttle are made in drain channel between hydraulically locking chamber and valve. Control element of throttling unit is rigidly coupled with needle, is made between valve in drain channel and hydraulically locking chamber and is furnished with piston. This piston limits hydraulically locking chamber being mated with needle. Effective passage area of auxiliary throttle μ₂f₂ is within 0,083(μ₁f₁+μ₂f₂)≤μ₂f₂≤0,33(μ₁f₁+μ₂f₂), where (μ₁f₁+μ₂f₂) is sum of effective passage areas of main and auxiliary throttles. Diameter d_p of piston of control element is within 1,3d_n≤d_p≤1,7d_n, where d_n is diameter of spray tip needle. Diameter d_c of control unit is within 0,67d_p≤d_c≤0,83d_p. EFFECT: possibility of injection of fuel within wide range of pressure at nozzle inlet at preservation of stability of low cyclic deliveries and minimization of fuel consumption for control. 1 dwg