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. 15, 2020
Filed:
Apr. 14, 2020
Applicant:
Ngk Spark Plug Co., Ltd., Nagoya-shi, Aichi, JP;
Inventors:
Assignee:
NGK SPARK PLUG CO., LTD., Nagoya-shi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01T 13/39 (2006.01); H01T 13/32 (2006.01); H01T 21/02 (2006.01); H01T 13/52 (2006.01); H01T 13/06 (2006.01);
U.S. Cl.
CPC ...
H01T 13/39 (2013.01); H01T 13/06 (2013.01); H01T 13/32 (2013.01); H01T 13/52 (2013.01); H01T 21/02 (2013.01);
Abstract
A spark plug wherein the occurrence of pre-ignition and misfires is suppressed. The spark plug includes a cover portion that covers a front end portion of a center electrode and a facing portion of a ground electrode from a front end side of the spark plug to form a pre-chamber space. The cover portion has injection holes that are through-holes. A total area A (mm) of inner peripheral surfaces of the injection holes and a thermal conductivity B (W/mK) of a material of the cover portion satisfy a formula (1): 10<A×B<4000.