VALVE-TYPE FUEL INJECTION NOZZLE Russian patent published in 2006 - IPC F02M61/14 F02M61/16 

FIELD: mechanical engineering; internal combustion engine.

SUBSTANCE: proposed fuel injection nozzle is installed in seat hole in engine cylinder head and is provided with sealing ring arranged around said valve-type nozzle in seat hole. Sealing ring has spherical contact surface pointed to valve-type nozzle. Said surface adjoins corresponding spherical surface of valve-type nozzle. Spherical contact surface of sealing ring has form concave in section. Sealing ring is provided with circular lower groove made on its surface pointed to combustion chamber and arranged in ring clearance between wall of seat hole valve-type nozzle. Sealing ring has circular upper groove made on surface distant relative to combustion chamber and arranged in ring clearance between wall of seat hole and valve-type nozzle. Radius of spherical contacts surface of sealing ring and mating spherical surface of valve-type nozzle is chosen to provide location of center of rotation of said spherical surfaces of middle axis of calve-type nozzle. Sealing ring is installed in circular groove of valve-type nozzle. Said groove designed for sealing ring is made on spray tip, on nozzle needle seat holder. Spray tip, respectively, nozzle needle seat holder is made in form of deep drawn part with mated spherical surface of valve-type nozzle. Sealing ring is made of polytetrafluoroethylene.

EFFECT: provision of reliable sealing of ring clearance between wall of seat hole and valve-type nozzle, simple design of valve-type nozzle and low cost.

9 cl, 4 dwg