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:
May. 01, 2012
Filed:
Mar. 12, 2007
Mao Takei, Hyogo, JP;
Toshinari Nishimura, Tokyo, JP;
Takahiko Hirohata, Hyogo, JP;
Masaya Kanikawa, Hyogo, JP;
Mao Takei, Hyogo, JP;
Toshinari Nishimura, Tokyo, JP;
Takahiko Hirohata, Hyogo, JP;
Masaya Kanikawa, Hyogo, JP;
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
Abstract
The invention improves reliability of a valve gear in which a cobalt-based alloy is welded by plasma power building up. The valve gear includes a bearinghaving a sliding surface against a valve shaft. The valve gear having a welded layermade of heat-resistant cobalt-based alloy, based on plasma powder building up, formed on the sliding surface against the valve shaft. The welded layerincludes a first welded layerformed on the surface of the bearing, having a dilution ratio of 5 to 25% and a second welded layerformed on the first welded layer, having a dilution ratio of 50% or less of the dilution ratio of the first welded layer. The dilution ratio indicates the penetration amount of the welding metal into the base metal, and is a value obtained by B/A×100 (%) wherein A represents the total amount of the welded metal and B represents the amount of the welding metal penetrating into the base metal.