Patent ID: 7188788
Filing Date: 2007-03-13
Classification: F02M

Abstract:
1. A fuel injector assembly comprising: a housing defining a bore including an inlet and an outlet; a needle valve movable between an open position that provides for fuel flow through the outlet, and a closed position preventing fuel flow through the outlet, the needle valve including an upper portion and a lower portion, where the upper portion includes a diameter smaller than the lower portion; a valve for controlling movement of the needle valve by selectively controlling a pressure differential between the upper portion of the needle valve and the lower portion of the needle valve; a sleeve disposed over the needle valve defining a metering land selectively overlapping a metering bore to define a flow passage that creates a desired pressure differential between an upper surface of the metering land and a lower surface that generates a hydraulic bias on the needle valve toward the closed position; and a spacer disposed below the metering sleeve for aligning the sleeve with a metering edge defined by the metering bore.