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:
Mar. 07, 2000
Filed:
Jan. 16, 1998
Yasunaga Hamada, Hitachinaka, JP;
Hideo Tatsumi, Mito, JP;
Kenichi Gunji, Mito, JP;
Yukihiro Yoshinari, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Car Engineering Co., Ltd., Ibaraki, JP;
Abstract
When an electromagnetic coil receives an electric supply, a stationary core, a yoke, and a movable core form a magnetic circuit. The movable core is attracted to a side of the stationary core against the force provided by a return spring member. A fuel passage for injection of fuel is then opened. Axial direction stepwise differences are formed on the movable core. One end face of the stationary core opposes the stepwise difference through a first gap. A projection portion of the yoke is provided toward an inner side of the yoke. This projection portion opposes a position of a side to provide an axial direction magnetic attraction through a second gap. By the provision of the first and second gaps, plural axial direction magnetic attraction gaps are formed and become a part of the magnetic circuit. By increasing a magnetic attraction efficiency of the movable core, an improvement in performance of a fuel injector and a fuel injector having a compact size and a light weight structure can be attained.