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.

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.

An inclined surface corresponding portion (30) of a metal element raw material (23) and inclined surface forming portions (47b, 47c) of dies (47, 49) are parallel to each other and are in contact with each other without gap. Therefore, a press load required while forming a metal element (23) is suppressed to a minimum and durability of the dies (47, 49) is enhanced. In addition, recess portions (24a, 26a) are formed on both rear surfaces of an ear portion (26) and a body portion (24) of the metal element (23) through pressing by using the dies (47, 49). Therefore, the sizes of both the recess portions (24a, 26a) are adjusted to change radially inward/outward distributions of the press loads on the dies (47, 49), so that it is possible to prevent the dies from tilting and to reduce a difference in radially inward/outward plate thickness of the metal element (23).

A rear surface of a metal element (23) includes first contact portions (C1) formed on both right and left end sides of an ear portion (26), a second contact portion (C2) formed in a neck portion (25), and a third contact portion (C3) formed in a central portion in a transverse direction in the vicinity of a locking edge (29) of a body portion (24). The first contact portions (C1), the second contact portion (C2), and the third contact portion (C3) can come into contact with a front surface of another adjacent metal element (23) on a rear side. A plate thickness of the metal element (23) in the second contact portion (C2) is smaller than the plate thickness of the metal element (23) in the first contact portions (C1) and is greater than the plate thickness of the metal element (23) in the third contact portion (C3).

A rear surface of a metal element (23) includes first contact portions (C1) formed on both right and left end sides of an ear portion (26), a second contact portion (C2) formed in a neck portion (25), and a third contact portion (C3) formed in a central portion in a transverse direction in the vicinity of a locking edge (29) of a body portion (24). The first contact portions (C1), the second contact portion (C2), and the third contact portion (C3) can come into contact with a front surface of another adjacent metal element (23) on a rear side. A plate thickness of the metal element (23) in the second contact portion (C2) is smaller than the plate thickness of the metal element (23) in the first contact portions (C1) and is greater than the plate thickness of the metal element (23) in the third contact portion (C3).

An endless rubber power transmission belt such as a CVT belt having a main belt body with a compression portion, tension portion, an adhesion portion, and a tensile cord in contact with the adhesion portion and embedded between the compression portion and the tension portion, angled sides, and a width to thickness ratio on the order of 2 to 3. At least one of the compression portion, the tension portion and the adhesion portion has an elastomer composition that includes a saturated ethylene-alpha-olefin elastomer, a staple fiber, and a pulp fiber, or an elastomer, a high-modulus staple fiber, and a high-modulus pulp fiber. The pulp fiber constitutes less than 40% of the total high-modulus fiber amount.

An endless rubber power transmission belt such as a CVT belt having a main belt body with a compression portion, tension portion, an adhesion portion, and a tensile cord in contact with the adhesion portion and embedded between the compression portion and the tension portion, angled sides, and a width to thickness ratio on the order of 2 to 3. At least one of the compression portion, the tension portion and the adhesion portion has an elastomer composition that includes a saturated ethylene-alpha-olefin elastomer, a staple fiber, and a pulp fiber, or an elastomer, a high-modulus staple fiber, and a high-modulus pulp fiber. The pulp fiber constitutes less than 40% of the total high-modulus fiber amount.

In a pushbelt for a continuously variable transmission that includes at least one endless carrier and a number of transverse segments, which are mounted on the endless carrier. The transverse segments include a bearing surface that contacts the radial inside of the endless carrier, as well as a convexly curved tilting edge that is a part of a main body surface of the transverse segment. According to the present disclosure the convex curvature of the tilting edge extends both radially inward or below and radially outward or above the bearing surface, at least as seen in radial or height direction relative to the endless carrier.

In a pushbelt for a continuously variable transmission that includes at least one endless carrier and a number of transverse segments, which are mounted on the endless carrier. The transverse segments include a bearing surface that contacts the radial inside of the endless carrier, as well as a convexly curved tilting edge that is a part of a main body surface of the transverse segment. According to the present disclosure the convex curvature of the tilting edge extends both radially inward or below and radially outward or above the bearing surface, at least as seen in radial or height direction relative to the endless carrier.

A metal belt for a continuously variable transmission includes a metal element wound around a drive pulley and a driven pulley and transmits a driving force between the two pulleys, in which a rocking edge is provided at the radially outer end of a front face of a body part. The rocking edge being a fulcrum for pitching of the metal element, and a recess is formed in a rear face of a neck part, and therefore, when the metal element on the rear side is displaced toward the radially outer side with respect to the metal element on the front side, the rocking edge of the metal element on the rear side enters a ring slot and the recess of the metal element on the front side, and the metal element on the rear side moves so as to be closer to the metal element on the front side.