Patent ID: 7469845

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 extend through the generally planar surface, the metering orifices being located radially outward of the seat orifice, each of the metering orifices having a center defined by the interior surface of the metering orifice through the disc; a first wall having a first inner wall portion closest to the longitudinal axis and a first outer wall portion closest to the center of the metering orifice; a second wall having a second inner wall portion furthest from the center of the metering orifice and a second outer wall portion closest to the center of the metering orifice, the second wall confronting the first wall to define two channels that converge towards each metering orifice, each channel including a first distance between the first inner wall portion and second inner wall portion being greater than a second distance between the first outer wall portion and second outer wall portion.