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:
May. 23, 1995
Filed:
Feb. 10, 1994
Alessandro Facchin, Pisa, IT;
Siemens Automotive L.P., Auburn Hills, MI (US);
Abstract
Magnetic force is increased for faster opening by providing two axial gaps, namely a radially inner gap and a radially outer gap, between the stator and the armature. When the fuel injector opens, impact of the armature with the stator occurs at the inner gap. The maximum radial extent of the armature is less than the radial dimension of the stator housing cavity containing the solenoid coil. The outer gap is defined between the margin of a magnetic pole washer that surrounds a central through-hole in the pole washer and a circular flange of the armature. The inner gap is defined between a ring-shaped upper end face of the armature and a ring-shaped lower end face of a tubular central magnetic pole that extends coaxially through the stator housing to the vicinity of the through-hole in the magnetic pole washer. The portion of the armature that contains the armature's ring-shaped upper end face protrudes through the central through-hole in the pole washer to confront the lower end face of the central magnetic pole.