EP 0061529 B1 19850619 - FUEL INJECTION NOZZLE FOR INTERNAL-COMBUSTION ENGINES
Title (en)
FUEL INJECTION NOZZLE FOR INTERNAL-COMBUSTION ENGINES
Publication
Application
Priority
DE 3112467 A 19810328
Abstract (en)
[origin: EP0061529A1] 1. Fuel injection nozzle for internal-combustion engines, having a valve needle (12) opening counter to the flow direction of the fuel, formed onto which is a sealing cone (18), interacting with a valve seat (16) on the nozzle body (10), and onto which then is formed a restricting neck (24), which in the closed position of the valve needle (12) immerses with a cylindrical section (26) into a cylindrical section (35) of the nozzle bore (20) downstream of the valve seat (16) and delimits therein, over the extent of a first partial stroke of the valve needle (12), a restricting metering gap (40) for governing the size of a preliminary fuel jet, characterised in that a further cylindrical section (32, 38) is formed on the restricting neck (24) and/or in the nozzle bore (20) downstream of the metering gap (40), which section, in the closed position of the valve needle (12), forms with an opposite wall section (38, 32) of the nozzle bore (20) or of the restricting neck (24) a protective gap (42) of restricting cross section, the length of which is smaller in the closed position of the valve needle (12) than the length of the metering gap (40) formed in this position, and which extends as the opening stroke of the valve needle (12) begins, enlarging faster than the metering gap (40), up to a cross section not even restricting the main fuel jet.
IPC 1-7
IPC 8 full level
F02M 61/06 (2006.01)
CPC (source: EP)
F02M 61/06 (2013.01)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0061529 A1 19821006; EP 0061529 B1 19850619; DE 3112467 A1 19821230; DE 3171063 D1 19850725; JP S57173556 A 19821025
DOCDB simple family (application)
EP 81109692 A 19811114; DE 3112467 A 19810328; DE 3171063 T 19811114; JP 4923582 A 19820329