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. 16, 2021
Filed:
Dec. 09, 2014
Applicants:
Aichi Steel Corporation, Tokai, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Inventors:
Assignees:
Aichi Steel Corporation, Tokai, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Primary Examiner:
Int. Cl.
CPC ...
C22C 38/22 (2006.01); C22C 38/24 (2006.01); C21D 9/40 (2006.01); C21D 1/06 (2006.01); F16G 5/16 (2006.01); C23C 8/26 (2006.01); C22C 38/34 (2006.01); C22C 38/12 (2006.01); B21B 5/00 (2006.01); C21D 1/18 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); B21D 53/14 (2006.01);
U.S. Cl.
CPC ...
F16G 5/16 (2013.01); B21B 5/00 (2013.01); C21D 1/06 (2013.01); C21D 1/18 (2013.01); C21D 9/40 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/12 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/34 (2013.01); C23C 8/26 (2013.01); B21D 53/14 (2013.01);
Abstract
Provided is a CVT ring member having a nitrided layer on a surface thereof. The CVT ring member includes a chemical composition containing, by mass, C: 0.43 to 0.70%, Si: 2.50% or less, Mn: 1.00% or less, Cr: 1.50 to 4.00%, Mo: 0.50 to 3.00% and V: 1.00% or less while satisfying a relation of Formula 1: 159×C(%)+91×Si(%)+68×Cr(%)+198×Mo (%)+646≥1,000, and the balance being Fe and unavoidable impurities. The ring member has a tensile strength of 1,700 MPa or more. The nitrided layer has a surface hardness of HV800 to HV950.