Patent ID: 6302971
Filing Date: 2001-10-16
Classification: B21H,B23P,F16H,Y10T

Abstract:
A process for making a moveable pulley half of a pulley useable with an endless driving belt in a continuously variable transmission, said moveable pulley half having an axis and including a hollow shaft portion axially extending, a radially outwardly extending flange portion connected with the shaft portion and formed with a contact surface for frictional contact with the driving belt, and an integral cylinder portion axially extending at near an outer periphery of the flange portion, said process comprising:forming a workpiece including a hub wall having a cylindrical bore having a center axis and a flange wall extending perpendicular to the center axis from the hub wall;machining the workpiece to form the shaft portion from the hub wall, a preformed flange having a truncated conical surface from the flange wall, a thickened peripheral portion axially extending from an outer circumferential portion of the preformed flange, and a communication hole communicating with the cylindrical bore;spinning the workpiece to form the integral cylinder portion from the thickened peripheral portion;heat-treating the workpiece; andfinishing the workpiece to complete the moveable pulley half including the flange portion having the contact surface.