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:
Mar. 09, 2004
Filed:
Apr. 11, 2002
Akira Suzuki, 14-18, Takatsuji-cho, Mizuho-ku, Nagoya-shi, Aichi 467-8525, JP;
Takahiro Suzuki, 14-18, Takatsuji-cho, Mizuho-ku, Nagoya-shi, Aichi 467-8525, JP;
Kazumi Kawamura, 14-18, Takatsuji-cho, Mizuho-ku, Nagoya-shi, Aichi 467-8525, JP;
Kazuya Iwata, 14-18, Takatsuji-cho, Mizuho-ku, Nagoya-shi, Aichi 467-8525, JP;
Other;
Abstract
A spark plug has a central electrode, an insulator surrounding the central electrode and a metallic shell retaining therein the insulator and provided with no thread thereon. The spark plug is clearance fitted in a plug hole of a cylinder head, without being screwed into the plug hole, in such a manner that a front end portion of the metallic shell is accommodated in a front end section of the plug hole with a clearance therebetween provided with a sealant so as to transmit heat from the spark plug to the cylinder head. The clearance is preferably given by the following expression: 0.005≦D−d ≦0.05, where D is an inner diameter (mm) of the front end section and d is an outer diameter (mm) of the front end portion. By this, the spark plug can be easily attached to the cylinder head and attain improved heat resistance.