Title:
FUEL INJECTION NOZZLE OF DIESEL ENGINE
Document Type and Number:
Japanese Patent JP3453215
Kind Code:
B2
Abstract:
PURPOSE: To restrain the initial injection rate in a fuel injection nozzle, and reduce the emission of NOx and the combustion noise while preventing the exhaust of black smoke from becoming worse.
CONSTITUTION: The fuel injection nozzle of a diesel engine is constituted in such a way that a cylindrical small-diameter part 8 to be fittedly inserted into the inside diameter of a sack part 4 is formed at the end part of the needle valve 2 that has been internally provided in the nozzle body 1 so as to be liftable, and the small-diameter part 8 directly closes the injection holes 3 when the lift of the needle valve is zero, and the effective area of the injection holes 3 is increased as the needle valve 2 is gradually lifted, and that a circumferential groove 5 all around the base part of the small-diameter part 8 and a fuel introducing passage 6 for communicating the circumferential groove 5 with the end inside of the sack part 4 area formed so as to communicate the end inside of the sack part 4 with the fuel passage inside the nozzle body 1. Thereby, the reduction of the fuel injection pressure in the initial stage of injection can be prevented, and grain diameter of the fuel spray particle becomes smaller for accelerating the production of mixture with air, so that the combustion of the engine can be improved.
Inventors:
Yuji Yamaguchi
Application Number:
JP6629095A
Publication Date:
October 06, 2003
Filing Date:
March 24, 1995
Export Citation:
Assignee:
Nissan Diesel Co., Ltd.
International Classes:
F02M61/10; F02M61/04; F02M61/16; F02M61/18; F02B3/06; (IPC1-7): F02M61/10; F02M61/16
Domestic Patent References:
| JP821338A | ||||
| JP623966U | ||||
| JP474846B1 |
Attorney, Agent or Firm:
Fujio Sasashima