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:
Mar. 24, 1987
Filed:
May. 06, 1985
Applicant:
Inventors:
Assignee:
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Primary Examiner:
Int. Cl.
CPC ...
B23K / ; B23K / ;
U.S. Cl.
CPC ...
2191 / ; 2191 / ; 2191 / ;
Abstract
A method of producing a cast iron camshaft including the steps of applying a high-density energy source, such as a TIG arc, a laser beam, and an electron beam over the entire sliding surface of a cam to melt the surface portion and cooling the cam by dissipating the localized heat through the camshaft itself so as to form a double structure hardened layer consisting of a chilled layer having a large amount of cementite and a hardened layer of martensite. This method omits the preheating of the camshaft prior to the high-density energy irradiation.