Patent ID: 6742727
Filing Date: 2004-06-01
Classification: F02M

Abstract:
A fuel injector comprising:a housing having an inlet, an outlet and a longitudinal axis extending therethrough; a valve seat disposed proximate the outlet, the valve seat including a sealing surface, an orifice, and a first channel surface, the orifice having a first diameter; a metering orifice disc located at the outlet, the metering orifice disc having a plurality of metering openings extending therethrough, a second channel surface confronting the first channel surface, the metering openings tangential to a virtual circle, the virtual circle having a diameter greater than the first diameter; a needle being reciprocally located within the housing along the longitudinal axis between a first position wherein the needle is displaced from the valve seat, allowing fuel flow past the needle, and a second position wherein the needle is biased against the valve seat, precluding fuel flow past the needle; and a controlled velocity channel disposed between the first channel surface of the valve seat and the second channel surface of the metering orifice disc, the controlled velocity channel extending outwardly from the orifice to the plurality of metering openings, such that fuel flow is at a generally constant velocity between the first orifice and the plurality of metering openings to maintain a constant flow velocity of fuel between the valve seat and the metering orifice, wherein the metering orifice disc is generally planar and perpendicular to the longitudinal axis and includes a raised portion between the metering openings.