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:
Sep. 27, 2022
Filed:
Oct. 01, 2020
Ngk Spark Plug Co., Ltd., Nagoya, JP;
Koichiro Saito, Nagoya, JP;
Susumu Imai, Nagoya, JP;
NGK SPARK PLUG CO., LTD., Nagoya, JP;
Abstract
A spark plug including a center electrode; a metallic member forming a tubular shape around an axis of the spark plug, holding the center electrode therein, and having a hole formed in a side wall thereof and extending in a radial direction; and a ground electrode supported in the hole and extending from the hole toward the axis. The ground electrode has a fixing portion formed of metal and fixed to the hole, and an ignition portion containing a noble metal, disposed on a side toward the axis in relation to the fixing portion, and having a discharge surface for forming a gap between the ignition portion and the center electrode. The absolute value of the difference in coefficient of thermal expansion between the metallic member and the fixing portion is smaller than the absolute value of the difference in coefficient of thermal expansion between the metallic member and the ignition portion.