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. 27, 2014
Filed:
Aug. 04, 2010
Akira Suzuki, Nagoya, JP;
Mamoru Musasa, Nagoya, JP;
Akira Suzuki, Nagoya, JP;
Mamoru Musasa, Nagoya, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
Problem is to enhance the welding strength when a projecting shape section is resistance-welded to a around electrode. A ground electrodeincludes a ground electrode base materialand a projecting shape section. The projecting shape sectionis connected by resistance welding to an opposite surfaceof the ground electrodeso as to be opposite and project towards the leading end of a center electrode. The ground electrode base materialand the projecting shape sectionare formed from a material that is composed of the same metal (for example, nickel) as a main component and have a relation of formulas (1) and (2) described below. In formula (1), the specific resistance of the ground electrode base materialis R (μΩcm) and the specific resistance of the projecting shape sectionis S (μΩcm). The specific resistance R>the specific resistance S . . . (formula 1), the specific resistance R−specific resistance S≧20 . . . (formula 2). Accordingly, fusion of the ground electrode base materialthat has a larger volume than that of the projecting shape sectioncan be expedited and the welding strength can be enhanced.