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. 21, 2015
Filed:
Jun. 10, 2011
Kazuyuki Teshima, Higashihiroshima, JP;
Yoshikazu Nishiyama, Higashihiroshima, JP;
Hiroyuki Takeshige, Higashihiroshima, JP;
Hiroaki Muranaka, Higashihiroshima, JP;
Kazuyuki Teshima, Higashihiroshima, JP;
Yoshikazu Nishiyama, Higashihiroshima, JP;
Hiroyuki Takeshige, Higashihiroshima, JP;
Hiroaki Muranaka, Higashihiroshima, JP;
Kolbenschmidt K. K., Hiroshima, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
The present invention provides a piston for a spark-ignition engine, comprising: a land part, an upper surface part of which has a crown partforming a combustion chamber; a pair of skirt partsextending downward from a peripheral part of the land partand facing each other in a radial direction thereof; a pair of sidewall partscoupling side end parts of the pair of skirt partsto each other; and a pin boss partthat is formed in each of the sidewall parts. The present invention can inhibit the generation of HC produced at the time of combustion, while thermally protecting a top ringfitted into a top ring grooveon an outer circumferential surface of the land part. The crown partis configured by a flat base surfaceand a bulging partbulging upward above the base surface, and a thinned partprovided in the land partis formed deep such that the deepest part thereof is positioned inside the bulging part