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:
Jun. 13, 2006
Filed:
Mar. 24, 2003
Yoshiki Ishikawa, Tochigi-ken, JP;
Fujio Anzai, Tochigi-ken, JP;
Yoshiki Ishikawa, Tochigi-ken, JP;
Fujio Anzai, Tochigi-ken, JP;
Nippon Piston Ring Co., Ltd., Saitama-ken, JP;
Abstract
A cylinder liner for use in an internal combustion engine has an inner peripheral surface at which a surface treatment layer is formed upon water vapor treatment. The surface treatment layer has a surface configuration capable of providing excellent lubrication oil retaining function and initial break-in property as well as capable of being machined easily. The treatment surface of the cylinder liner has a plateau configuration providing a surface roughness Rz of 0.8 to 5.9 μm, and the plateau configuration is defined under DIN4776 by a reduced peak height Rpk of not more than 0.64 μm, a core roughness depth Rk of 0.05 to 1.8 μm, and a reduced valley depth Rvk of 0.15 to 3.3 μm. For grinding to the surface, a honing machine employs a grindstone containing metal bonded diamond grains at high density. Diamond grain size is not less than 4000.