Fuel injection valve
AssigneeHitachi Automotive Systems, Ltd.
InventorsYoshio Okamoto, Kazuki Yoshimura, Noriyuki Maekawa, Nobuaki Kobayashi, Eiji Ishii, Takahiro Saito
Life of this patent
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Abstract
A fuel injection valve realizing improved circumferential uniformity of swirling fuel is provided. The fuel injection valve includes a swirling chamber having an inner peripheral wall whose curvature is gradually larger from upstream to downstream, a path for swirling which, having a fuel flow-in region formed along a valve axis direction, guides fuel to the swirling chamber, and a fuel injection orifice open into the swirling chamber. In the fuel injection valve, the path for swirling is inclined toward the fuel injection orifice formed on a downstream side of the swirling chamber.
Claims3
A fuel injection valve, comprising:
- a slidably installed valve element;
- a nozzle body having a valve seat surface formed thereon where the valve element is seated when the valve is closed and an opening formed on a downstream side of a fuel flow;
- a path for swirling communicated with the opening of the nozzle body and formed, relative to the nozzle body, on a downstream side of the fuel flow;
- a swirling chamber formed, relative to the path for swirling, on a downstream side of the fuel flow, the swirling chamber having a cylindrical inner surface and swirling fuel therein thereby providing the fuel with a swirling force;
- and a fuel injection orifice cylindrically formed at a bottom of the swirling chamber to outwardly spray fuel, wherein the swirling chamber is provided inclinedly toward the fuel injection orifice, so that a longitudinal axis of the path for swirling intersects a line that passes through a center of the opening and a center of the fuel injection orifice, wherein the path for swirling has walls that are straight, the straight walls of the path for swirling defining a projection, the fuel injection orifice has walls that are straight, the straight walls of the fuel injection orifice defining another projection;
- the entire another projection of the fuel injection orifice does not intersect the projection defined by the path for swirling along both a width direction of the fuel injection valve and a longitudinal direction of the fuel injection valve.
Dependencies are inferred from the claim text.