Hitachi, Ltd.

Hitachi Automotive Systems, Ltd.

Masanori Mifuji

Yoshio Okamoto

Motoyuki Abe

Tohru Ishikawa

Takao Miyake

Kiyotaka Ogura

Atsushi Sekine

Eiji Ishii

Hideharu Ehara

Atsushi Takaoku

An object of the invention is to provide a fuel injection valve that applies a swirl to an upstream side of a seat section to shorten spray penetration. When flows into injection hole entries are indicated by arrowstoand injection hole exit directions are indicated by arrowsto, an angle &#x3b1; defined by the inflow directionand the exit directionof an injection holecan be increased. In a method for applying the twisted angle &#x3b1;, a side grooveon an outer peripheral side of a guide memberis set to be accompanied with a twist with respect to an axis O. Furthermore, a flow passage area of the side grooveis set smaller than a flow passage area on an upstream side of the guide memberand is also set larger than a flow passage area of a seat sectionB that is constructed by a gap between a valve bodyand an orifice cup

Fuel injection valve

A fuel injector has a plunger for opening/closing a fuel path to control the amount of fuel to be injected; a seat portion for the plunger; and a plurality of nozzle holes for injecting fuel passed through between the plunger and the seat portion, A nozzle plate is provided with the seat portion, and a taper-fuel inlet hole has a diameter that gradually reduces from the seat toward its outlet, An orifice plate is arranged downstream from the taper-fuel inlet hole, and is provided with a concave portion opposite to the nozzle plate, with a plurality of nozzle holes being formed concentrically at a bottom of the concave portion. Each nozzle hole has an inclined angle in the direction of the plate thickness within the concave area.

Fuel injector and in-cylinder direct-injection gasoline engine

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Hitachinaka, Japan

Masanori Mifuji