Fuel jet device

Abstract

The invention provides a fuel injector capable of improving atomization of a spray by forming various spray shapes and injection directions while restraining sticking of fuel to an injection port outlet. This fuel injector has a valve element (2) for opening and closing a valve seat (3b), and injects the fuel into an internal combustion engine by opening a valve when the valve element (2) moves to the downstream side. A plate (9) is arranged in its tip part. The plate (9) is provided with a projection part (9a) opposed to a valve element end surface (2d). The plate (9) is also provided with a plurality of injection holes (9b) inclining by a predetermined angle in the direction for separating from the axis of a valve device (1). The valve element end surface (2d) contacts with the projection part (9a) by opening the valve, and a cavity (10) is formed between the valve element end surface (2d) and the plate (9), and the injection holes (9b) are communicated with the cavity (10).

Description

technical field [0001] The present invention relates to a fuel injection device for an internal combustion engine, in particular to a fuel injection device which improves the shape and injection direction of fuel spray and can promote atomization. Background technique [0002] In recent years, the exhaust gas regulation of automobiles has been strengthened, and various shapes and directions have been requested for the shape and injection direction of the fuel spray injected by the fuel injection device, and at the same time, it has been required to promote atomization of the spray. In particular, various studies have been made on the atomization of fuel spray. In conventional fuel injection devices, long grooves are radially formed on the outlet end surface of the injection port on the valve seat side or on the downstream side of the valve element relative to the axis of the valve element. . [0003] In this fuel injection device, since the spray surrounds the end surface o...

AI Technical Summary

Problems solved by technology

[0005] The conventional fuel injection device configured as above has the following problem: the long groove provided in the injection port makes it difficult to independently control the spray shape and the injection direction.

There is also the following problem: since the long groove is provided on the downstream side of the seat portion where the valve element and the valve seat abut, the fuel remains in the long groove after the fuel injection is completed.

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