Patent ID: 6526798
Filing Date: 2003-03-04
Classification: F16G,Y10T

Abstract:
A method of blanking an element for a belt for use in a continuously variable transmission which is produced by stacking a plurality of plate-shaped elements, each having a body with opposite side edges positioned for contact with a pulley of the continously variable transmission and a head joined to the body by a narrower neck, and inserting endless rings into recesses defined between the body and the head by the neck, comprising the steps of:blanking an element out of a metal sheet with a press having a die and a punch, said die and said punch having respective cutting edges, the cutting edge of said punch being more widely spread from the cutting edge of said die in a range of the element which includes edges of the neck, and a first portion of edges of the head and body contiguous to said edges of the neck and close to said neck, than in another range of the element which includes a second portion of edges of the head and body other than the first portion of edges of the body; forming said edges of the neck, and the first portion of said edges of the head, and body, of a sheared surface in a transverse direction of said edges and a ruptured surface contiguous to said sheared surface, and forming a burr next to said ruptured surface in a position out of contact with the endless rings.