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:
Jan. 23, 2007
Filed:
Jun. 02, 2004
Daiju Yamada, Kanagawa, JP;
Kazuo Sasaki, Kanagawa, JP;
Fujihiro Matsuura, Kanagawa, JP;
Kioritz Corporation, Tokyo, JP;
Abstract
There is provided a method of cast molding a cylinder for an internal combustion engine by making use of an insert core, which makes it possible to rationally form the chamfered portions at the rim portion, on the cylinder bore side, of the scavenging ports, the suction port and the exhaust port with high precision and high freedom in dimension and configuration without fluctuation in size and configuration of the chamfered portion. Herein, the insert core is formed of a cylindrical body having a slightly smaller outer diameter than the diameter of cylinder bore, a scavenging port-forming portion projecting radially outward from the cylindrical body and having almost the same configuration as that of the scavenging port, a suction port-forming portion projecting radially outward from the cylindrical body and having almost the same configuration as that of the cylinder bore-side end portion of suction port, and an exhaust port-forming portion projecting radially outward from the cylindrical body and having almost the same configuration as that of the cylinder bore-side end portion of exhaust port. The insert core further includes chamfered portion-forming portions for forming a chamfered portion at each of the rim portions on the cylinder bore side of the scavenging ports, the suction port, and the exhaust port.