Jayashree R Moorthy

US Patent:

20030111544, Jun 19, 2003

Filed:

Dec 17, 2001

Appl. No.:

10/015941

Inventors:

Jayashree Moorthy - Yorktown VA, US
Wei-Min Ren - Niskayuna NY, US

International Classification:

F02M039/00

US Classification:

239/005000, 239/533300, 239/585100

Abstract:

A fuel injector for use in a fuel injection system of an internal combustion engine that includes a body, a valve seat, a closure member, an orifice plate and a metering device. The body has an inlet, an outlet and a longitudinal axis. The valve seat is proximate the outlet and has first and second surfaces and a valve seat orifice between the first and second surfaces. The closure member is movable along the longitudinal axis between a first position occluding flow and a second position permitting flow through the valve seat orifice. The closure member and the valve seat define a sealing surface, located on a virtual circle defining a sealing diameter, in the first position of the closure member. The orifice plate is proximate the outlet and includes a third surface, a fourth surface and at least one orifice, located on a virtual circle on the orifice plate defining a first radius and between the third and fourth surfaces. The metering device is between the valve seat and the orifice plate and has first and second faces contiguous to a third face. At least one of the first and third faces are spaced from one of the first and second surfaces of the valve seat to define a plurality of passages. Each passage has an inlet to and an outlet from the passage, which is located on a virtual circle defining a second diameter greater than at least one of the first and the sealing diameters.