US 12,135,001 B2
Fuel injection valve
Takaki Itaya, Hitachinaka (JP); and Noriyuki Maekawa, Hitachinaka (JP)
Assigned to Hitachi Astemo, Ltd., Hitachinaka (JP)
Appl. No. 17/286,097
Filed by Hitachi Astemo, Ltd., Hitachinaka (JP)
PCT Filed Oct. 4, 2019, PCT No. PCT/JP2019/039245
§ 371(c)(1), (2) Date Apr. 16, 2021,
PCT Pub. No. WO2020/085039, PCT Pub. Date Apr. 30, 2020.
Claims priority of application No. 2018-201665 (JP), filed on Oct. 26, 2018.
Prior Publication US 2021/0381479 A1, Dec. 9, 2021
Int. Cl. F02M 61/18 (2006.01); F02M 63/00 (2006.01)
CPC F02M 61/1806 (2013.01) [F02M 61/1846 (2013.01); F02M 63/0077 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A fuel injection valve comprising:
a seat portion on which a valve body abuts;
a plurality of injection holes having an inlet opening on a downstream side of the seat portion; and
an injection-hole forming member in which the inlet opening is formed,
wherein the plurality of injection holes has an inner peripheral surface extending from an inlet side to an outlet side and a curved surface portion formed between a peripheral edge of the inlet opening and the inner peripheral surface,
on a plan view obtained by projecting the inner peripheral surface of the injection hole, the peripheral edge of the inlet opening, and an injection-hole center axis being a center axis of the injection hole, onto a virtual plane perpendicular to the injection-hole center axis,
the curved surface portion has a center-side curved surface portion and an outer-peripheral-side curved surface portion,
the center-side curved surface portion is a curved surface portion formed on an inner side of a center-side peripheral edge portion in a radial direction about an injection-valve center axis being a center axis of the fuel injection valve, in the peripheral edge of the inlet opening, and
the outer-peripheral-side curved surface portion is a curved surface portion formed on an inner side of an outer-peripheral-side peripheral edge portion in the radial direction about the injection-valve center axis, in the peripheral edge of the inlet opening, and
a width at the center-side curved surface portion is configured to be larger than a width at the outer peripheral-side curved surface portion,
the plurality of injection holes includes two injection holes having different inclination angles with respect to the central axis of the injection valve,
among the two injection holes, the injection hole having a large inclination angle with respect to the central axis of the injection valve is configured such that a width of the center-side curved surface portion is larger than a width of the center-side curved surface portion of the injection hole having a small inclination angle, and
wherein fuel injection valve is structurally configured so that multiple fuel flows interfere with and add each other to flow along the inner peripheral surface of the plurality of injection holes, so as to not cause flow separation, and to cause fuel to flow into the plurality of injection holes.