Fuel injection apparatus having cylinder screw for mounting fuel injector on engine

摘要

A cylinder screw (60) is fitted around an injector (1) axially movably between a tapered surface (11b) and a flange (22c). The cylinder screw (60) presses down the flange (22c) in a direction to attach the injector (10) to a cylinder head (1) and presses up the tapered surface (11b) in a direction to detach the injector (10) from the cylinder head (1). A stopper (40) is formed annularly at the top of the injector (10) and has a protrusion (40a). With the protrusion (40a) being engaged in a positioning groove (3a) of the cylinder head (1), the injector (10) is restricted from being turned in both rotating directions. Thus, the injector (10) can be attached to and detached from the cylinder head (1) with ease by only one cylinder screw (60) without turning the injector (10). The flange (22c) of a retaining nut (22) to which the tightening force of the cylinder screw (60) exerts has a shortened axial length so that deformation in injector constituting members is reduced and changes in the fuel injection characteristics are reduced. <IMAGE>