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:
Oct. 03, 2000
Filed:
Jul. 01, 1998
Hiroyuki Hattori, Toyota, JP;
Takashi Izuo, Toyota, JP;
Tatsuo Iida, Toyota, JP;
Masahiko Asano, Toyota, JP;
Yoshinori Kadowaki, Toyota, JP;
Akihiro Yanai, Toyota, JP;
Toshio Fuwa, Nagoya, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
The present invention relates to an electromagnetically driven valve suited for use in an internal combustion engine and aims at achieving appropriate operating characteristics in accordance with operating conditions of the internal combustion engine at the time of opening or closing a valve body. An armature moving together with the valve body is provided and upper and lower cores are disposed on opposed sides of the armature. The upper core and the lower core accommodate upper and lower coils, respectively. An annular protrusion, formed not on the upper core but on the lower core only, has an inner diameter slightly larger than an outer diameter of the armature.