| 摘要 |
<p>Provided is a metal ring having an excellent durability, wherein the reserve strength is prevented from decreasing, and the tension is prevented from concentrating on both sides in the width direction. In order to realize a method for efficiently producing the metal ring, the metal ring is composed of an endless belt-shaped element and has a nitride layer (12) on the surface, said metal ring constituting a part of a metal belt of a belt-type continuously variable transmission. The nitride layer (12) is comprised of a first nitride layer portion (12a) positioned on the outer peripheral surface (11a) side, a second nitride layer portion (12b) positioned on the inner peripheral surface (11b) side, and third nitride layer portions (12c) positioned on both end surface (11c) sides in the width direction. The thickness (Pc) of the third nitride layer (12c) is smaller than the thickness (Pa) of the first nitride layer portion (12a) and the thickness (Pb) of the second nitride layer portion (12b).</p> |
