Abstract: Provided is a continuously variable transmission belt that has a stacked ring body supporting in an annual manner a plurality of metal elements arranged in the front and the rear, that is wound around a drive sheave and a driven sheave, and that transmits drive force between the two sheaves. The front ends and the rear ends of the metal elements are formed in a single curved shape that protrudes smoothly in either the forward or the backward direction of the advancing direction.

Abstract: A method for manufacturing an endless metal ring by cutting an annular member made of maraging steel containing molybdenum into a ring element having a predetermined width, wherein a melted-solidified layer is formed on an outer circumference of the annular member, and the melted-solidified layers are arranged to be continuous in a circumferential direction of the ring element.

Abstract: To provide a metal ring excellent in durability by reducing decrease in margin of strength and concentration of tensile stress at its both widthwise end portions and to efficiently realize a production method of the same, a metal ring is formed in an endless band-like body having a nitride layer on its surface portion and constituting part of a metal belt of a belt type continuously variable transmission, the nitride layer being constituted by a first nitride layer portion positioned on an outer circumferential side, a second nitride layer portion positioned on an inner circumferential side, and third nitride layer portions positioned on both widthwise end sides, and the layer thicknesses of the third nitride layer portions being smaller than either one of the layer thicknesses of the first nitride layer portion and the second nitride layer portion.

Abstract: To provide a metal ring excellent in durability by reducing decrease in margin of strength and concentration of tensile stress at its both widthwise end portions and to efficiently realize a production method of the same, a metal ring is formed in an endless band-like body having a nitride layer on its surface portion and constituting part of a metal belt of a belt type continuously variable transmission, the nitride layer being constituted by a first nitride layer portion positioned on an outer circumferential side, a second nitride layer portion positioned on an inner circumferential side, and third nitride layer portions positioned on both widthwise end sides, and the layer thicknesses of the third nitride layer portions being smaller than either one of the layer thicknesses of the first nitride layer portion and the second nitride layer portion.