Fuel injection valve
AssigneesAisan Kogyo Kabushiki Kaisha, Toyota Jidosha Kabushiki Kaisha
InventorsMasahiro Koizumi, Yasunori Takaku, Keiso Takeda, Yukio Koseki, Tomojiro Sugimoto
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Abstract
The fuel injection valve according to the present invention is a fuel injection valve adapted to inject a swirl flow of a high-pressure fuel from an injection port thereof. The injection port includes a fuel inlet portion and a fuel outlet portion. The fuel inlet portion has a cylindrical bore. In the fuel outlet portion, a circumference of an inlet thereof is joined to that of an outlet of the cylindrical bore, and the fuel outlet portion has a cross-sectionally elliptic chamfered part diverging from the inlet thereof to the outlet thereof. A depth of the chamfered part is set ¼ to 2 times as large as a diameter of the fuel inlet portion.
Claims3
A fuel injection valve comprising:
- a valve seat including a substantially planar nozzle tip portion;
- a fuel injection port including a generally cylindrical fuel inlet portion, having a diameter D;
- and
- a fuel outlet portion having a generally elliptical chamfered portion with a depth h, the fuel injection portion defined in said substantially planar nozzle tip portion, a front fuel spray angle θa, and a side fuel spray angle θb, an inlet of the generally elliptical chamfered portion connecting to an outlet of the inlet portion;
- wherein h=D/4−2D;
- and wherein a fuel spray angle θ of said fuel outlet portion is defined such that 2θ=θa+θb.
Dependencies are inferred from the claim text.