Patent ID: 8864612
Filing Date: 2014-10-21
Classification: B21D,F01L,F16D,F16H,Y10T

Abstract:
1. A cam sprocket made of a stamped component that is attachable to one end in axial direction of a cam shaft of an engine, comprising: a ring-shaped plate portion that extends in a radial direction at a radially outer region of the cam sprocket by letting a radially inner region of the cam sprocket jut out in one axial direction, and that is provided with external teeth along its outer circumference; a circular plate portion that is disposed at the radially inner region substantially parallel to the ring-shaped plate portion and at a level difference in axial direction to the ring-shaped plate portion, the circular plate portion being abuttable against one end face in axial direction of the cam shaft; and a tapered portion linking the circular plate portion to the ring-shaped portion at a radially intermediate region; wherein the tapered portion and the circular plate portion is provided with a plurality of punched portions for abutting the circular plate portion against the one face in axial direction of the cam shaft after matching a center of curvature of a circle circumscribing the external teeth to a rotation axis of the cam shaft when attaching the cam sprocket to the one end in axial direction of the cam shaft; and wherein the plurality of punched portions are formed by punching at several locations along the circumferential direction in a direction that is opposite to the direction in which the circular plate portion juts out, and radially inner faces of the punched portions are provided with a partial circular arc shape so as to come into area contact with an outer circumferential surface at the one end in axial direction of the cam shaft.