Holding construction of a fuel injection valve in an internal combustion engine

Claim 1

A fuel injection valve construction for an internal combustion engine having a cylinder head, comprising: a fuel injection valve arranged in a valve chamber in a central part of said cylinder head, said valve being formed with a laterally extending connecting portion having a conical receiving hole therein and an external thread formed thereon around said conical receiving hole; a fuel injection pipe formed at its tip end with a conical taper to fit said conical receiving hole and having an outwardly extending annular flange; a tightening tube surrounding said fuel injection pipe and having formed at its end an inwardly projecting flange and an internal thread fitting with said external thread; said fuel injection pipe and said tightening tube being laterally inserted from a side face of said cylinder head and being connected to said connecting portion by tightening said tightening tube internal thread on said connecting portion external thread to directly connect said conical taper of said fuel injection pipe with said conical receiving hole of said fuel injection valve; a leaking oil passage formed in said cylinder head and connected to a fuel-tank-side return pipe through a check valve; an upwardly extending upwardly opening leaking oil inlet port formed in said cylinder head between said leaking oil passage and said valve chamber; a downwardly opening leaking oil outlet port formed as a leaking-oil-passage-connecting part on said injection valve; and a vertically disposed connector in said valve chamber connecting said leaking oil outlet port to said leaking oil inlet port.