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:
Apr. 17, 2007
Filed:
Jan. 21, 2005
Koichi Hatamura, Hiroshima-shi, Hiroshima 732-0813, JP;
Takashi Suzuki, Ayabe, JP;
Hiroyuki Ogino, Ayabe, JP;
Takahiko Sugiura, Kyoto, JP;
Yasuyuki Okudaira, Ayabe, JP;
Takeshi Wakuda, Katano, JP;
Reiji Mahigashi, Fukuchiyama, JP;
Keisuke Umehara, Ayabe, JP;
Masahisa Kumashiro, Okayama, JP;
Koichi Hatamura, Hiroshima-shi, Hiroshima 732-0813, JP;
Takashi Suzuki, Ayabe, JP;
Hiroyuki Ogino, Ayabe, JP;
Takahiko Sugiura, Kyoto, JP;
Yasuyuki Okudaira, Ayabe, JP;
Takeshi Wakuda, Katano, JP;
Reiji Mahigashi, Fukuchiyama, JP;
Keisuke Umehara, Ayabe, JP;
Masahisa Kumashiro, Okayama, JP;
Other;
Kokusan Parts Industry Co., Ltd., Toyonaka-shi, JP;
Abstract
A metal gasket capable of preventing the occurrence of cracks in a stopper while employing a wave-shaped stopper, improving the contact pressure balance around the bead to enhance the engine performance, and improving the durability of the stopper. The metal gasket is constituted by a gasket component sheet having an opening formed to face a combustion chamber, and the gasket component sheet is provided with a combustion chamber bead surrounding the opening. An inner circumference side stopper lower than the height of the combustion chamber bead is formed along the combustion chamber bead in a portion between the combustion chamber bead and the opening such that at least a section of each wave where stress amplitude is large becomes thin, a thin portion and a thick portion are arranged alternately in each wave, and the hardness of the thin portion is higher than that of the thick portion.