Patent ID: 6226868
Filing Date: 2001-05-08
Classification: F02M,Y10T

Abstract:
A method of producing a connector for a fuel injection nozzle of an internal combustion engine, comprising the steps:firmly holding a metal sheet blank on a conical surface portion of a first die hole of a first die, wherein said first die hole has a diameter corresponding to an outer diameter of a fuel injection nozzle fitting portion of said connector, said conical surface portion being formed successive to said first die hole;providing a first punch including a first rod-shaped portion having a diameter smaller than that of said first die hole, and a truncated-conical surface portion formed around a proximal end of the rod-shaped portion;plunging said first punch into said first die to cause the rod-shaped portion thereof to move into said first die hole of the first die and to cause said truncated-conical surface portion to move towards said conical surface portion of the first die thereby obtaining an first intermediate product having said fuel injection nozzle fitting portion formed in said first die hole, an integral flared portion of the connector formed between said conical surface portion and said truncated-conical surface portion, and a bottom portion of the fuel injection nozzle fitting portion;forming a hole in said bottom portion of the thus formed fuel injection nozzle fitting portion thereby obtaining a second intermediate product;forming a delivery pipe connecting portion including a cylindrical flange extending outward from an area of said bottom portion around said hole in said bottom portion thereby obtaining a third intermediate product;trimming said flared portion to give a predetermined diameter to the flared portion and to form a plate-shaped position determining portion extending radially outward from the trimmed flared portion; andbending the plate-shaped position determining portion toward an outer surface of the fuel injection nozzle fitting portion.