Patent ID: 7950596
Filing Date: 2011-05-31
Classification: F02M,H01L,Y10T

Abstract:
1. A fuel injector comprising: a fuel injector body, defining a fuel inlet and at least one fuel outlet; a valve having a first valve state and a second valve state, and being configured to control a flow of a fluid within the fuel injector body via switching between the first valve state and the second valve state; an actuator for the valve which is movable between a first actuator position corresponding to the first valve state and a second actuator position corresponding to the second valve state; and a biasing spring including a cylindrical rolled sheet having a first spring end, a second spring end and defining a longitudinal center axis, the cylindrical rolled sheet being configured to change in length to bias the actuator toward the first actuator position and further having a helical weld seam located between the first spring end and the second spring end which has a shape adapted to reduce non-uniformity in a spring constant of the cylindrical rolled sheet, and the helical weld seam including a radial path having a turn about the longitudinal center axis substantially equal to 360°, such that a stiffness of the helical weld seam is distributed within the cylindrical rolled sheet with radial uniformity.