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:
Aug. 11, 2020
Filed:
Apr. 01, 2020
Ngk Spark Plug Co., Ltd., Nagoya-shi, Aichi, JP;
Tatsuya Gozawa, Nagoya, JP;
Daiki Goto, Nagoya, JP;
NGK SPARK PLUG CO., LTD., Nagoya-shi, JP;
Abstract
A spark plug wherein the occurrence of pre-ignition and misfires in the spark plug are 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 metal shell volume A (mm) of a portion of the metal shell on the front side with respect to a rear end of the pre-chamber space and a thermal conductivity B (W/mK) of the metal shell at the normal temperature satisfy a formula (1): 3.6<A/B<98.0. The metal shell volume A (mm) and a space volume C of the pre-chamber space satisfy a formula (2): 0.18<C/A<1.20.