The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 11, 2003
Filed:
Oct. 24, 2002
David Lee Porter, Westland, MI (US);
Visteon Global Technologies, Inc., Dearborn, MI (US);
Abstract
A top-feed electronic fuel injector for an internal combustion engine includes an injector body having a valve seat disposed opposite a generally cylindrical bore of nominal inner diameter defined within the injector body. A needle valve moves within the passage between a closed position against the valve seat, as urged by a coil spring disposed within the bore, and an open position away from the valve seat. The coil spring is seated against an end face a spring adjustment tube that is pressed into the bore. The spring adjustment tube, which is formed of rolled sheet stock to provide a “spiral-wound” configuration featuring at least 1.5 turns, end-to-end, when the spring adjustment tube is viewed in a transverse section, resiliently presses against the walls of the bore to maintain its position and, hence, calibrate the spring force applied to the needle valve.