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. 29, 2013
Filed:
Jun. 26, 2009
Masato Higuma, Hitachinaka, JP;
Kenichi Gunji, Mito, JP;
Atsushi Sekine, Hitachinaka, JP;
Hitachi Automotive Systems, Ltd., Hitachinaka-shi, JP;
Abstract
It is an object of the present invention to enhance the orifice design freedom and easy machine ability in a fuel injection valve in which orifices are formed by press-working. In a machining method for forming an orifice in a fuel injection valve by operating a punchin an axial direction inclined relative to a normal direction perpendicular to a tangent plane of a curved surface portionor relative to a perpendicular direction perpendicular to a slant surface of a slant surface portion, the machining method comprises a first step of operating the punchalong an axispre-shifted in parallel from an orifice axisand pressing an orifice plateto form a recess, a second step, after the first step, of shifting an axis of the punchto the position of the orifice axisand forming a recess in a bottomof the recessformed in the first step, the recess formed in the second step being deeper than the recess, and a third step of forming an orifice in a bottom of the orifice formed in the second step.