Patent ID: 7344090

Claim:
A fuel injector comprising: an inlet and an outlet and a passage extending along a longitudinal axis from the inlet to the outlet, the inlet communicable with a flow of fuel; a seat disposed in the passage proximate the outlet, the seat including a sealing surface that faces the inlet and a seat orifice extending through the seat from the sealing surface along the longitudinal axis; a closure member being reciprocally located between a first position displaced from the seat, and a second position contiguous the sealing seat surface of the seat to form a seal that precludes fuel flow past the closure member; a metering orifice disc disposed between the seat and the outlet, the metering orifice disc including: a generally planar surface; a plurality of metering orifices that extends through the generally planar surface, the metering orifices being located radially outward of the seat orifice, each metering orifice including an internal wall surface that defines a center of the metering orifice; an outer wall having a surface that defines first and second outer chords generally about the longitudinal axis, the first outer chord intersecting the second chord and having a length different than the length of the second outer chord; and an inner wall having a surface that defines first and second inner chords that extend generally transverse to the longitudinal axis, the first inner chord intersecting the second inner chord, the first inner chord having a length different than the length of the second inner chord.