FUEL PASSAGE SEALING STRUCTURE OF FUEL INJECTION NOZZLE

摘要

A fuel passage sealing structure of a fuel injection nozzle capable of increasing a seal surface pressure without changing the size and tightening force of a nozzle nut (9) to prevent high-pressure fuel from leaking by increasing the seal surface pressure between a first body such as an injector housing (2) and a second body such as a nozzle body (3), characterized in that a slightly shallow micro recessed part (31) is formed over a specified area while avoiding a first fuel passage (13) and a second fuel passage (14) and the outer edge parts (2A) of the first body (2) and the second body (3) in at least one of the first seal surface (24) of the first body (2) and the second seal surface (25) of the second body (3) to form the slight shallow micro recessed part (31) over the specified area in the area excluding the high-pressure fuel passages (13) and (14) and the outer edge parts (2A) of the seal surfaces (24) and (25), i.e., at the center side thereof.