Method for manufacturing endless metal belt, endless metal belt, and belt-type continuously variable transmission

Abstract

A method for manufacturing an endless metal belt used in a belt-type continuously variable transmission, wherein a stress-relief heat treatment is performed after the circumference of a ring body has been adjusted, and aging/nitridation is performed after the stress-relief heat treatment.

1 . An endless metal belt to be used in a continuously variable transmission, the endless metal belt being manufactured by an endless metal belt manufacturing method including:
 performing a stress-relief heat treatment of a ring body after the ring body is subjected to a circumferential length adjusting work, and   then, without performing another circumferential length adjusting work, performing an aging-nitriding treatment of the ring body after the stress-relief heat treatment.   
     
     
         2 . The endless metal belt according to  claim 1 , wherein the circumferential length adjusting work is performed after the ring body is subjected to rolling work. 
     
     
         3 . The endless metal belt according to  claim 1 , wherein the stress-relief heat treatment is performed on a plurality of ring bodies in a lamination state, each of the ring bodies having been subjected to the circumferential length adjusting work. 
     
     
         4 . The endless metal belt according to  claim 1 , wherein the ring body has residual stress almost equally accumulated on an outer peripheral side and an inner peripheral side of the ring body.