Patent ID: 6467148
Filing Date: 2002-10-22
Classification: F16G,Y10T

Abstract:
A method of producing a metal band of a metal belt for a belt-type continuously variable transmission, comprising the steps of:superposing a group of metal blank rings concentrically on one another to constitute laminated blank rings such that the grouped metal blank rings are laminated in a laminate manner, wherein the group of metal blank rings comprise predetermined members of metal blank rings and wherein each member among the predetermined members has a different inner and outer periphery lengths from inner and outer periphery lengths of the other members; fitting the laminated blank rings to an outer periphery of a circle jig in a state keeping the laminated manner and in a slightly flexible state, wherein the circle jig is made of material having higher thermal expansivity than that of the laminated blank rings and wherein a circular length of the outer periphery of the circle jig is kept constant except for any change caused by thermal expansion; heating the laminated blank rings and the circle jig, wherein the laminated blank rings are comprised of the predetermined members of blank rings in a state still keeping the laminated manner; and deforming each member of the metal blank rings plastically only by the different thermal expansivity between the circle jig and each member of the metal blank rings so as to enlarge each member of the metal blank rings so that each difference of length between an inner periphery length of one member among the members and an outer periphery length of another member located inwardly next to the one member is reduced, thereby producing the metal band, comprised of the predetermined members of the metal blank rings, in a fitting state.