| 摘要 |
PURPOSE:To produce easily and inexpensively a cam shaft having high accuracy by fitting and pressing a shaft member provided with a fitting part for a cam member and a projection and a cam member provided with a through-hole and a projecting contact surface to each other and subjecting the members to beam welding. CONSTITUTION:A hollow steel pipe is worked to form a fitting part 6 for a cam member and two through-holes 8, 10. The outside circumferential surface of the part 6 is finished by grinding. A pin 12 provided with a projection 14 having an end face 16 at the end is manufactured of a high grade material having resistance to wear and such pin is press-fitted into the holes 8, 10 so as to direct the end face 16 toward the rotating direction of the cam shaft, thereby forming a shaft body 5. On the other hand, a cam member 4 having a through-hole 18 fitting to the part 6, a notch 20 having a plane 26 and a projection 22 having an end face 30 is manufactured. The body 5 and the member 4 are fitted to each other by matching the projection 14 in such a way as to pass through the inside of the notch 2 so that the end face 16 of the projection 22 is pressed to the plane 26 of the notch 20 and the end face 30 of the projection 22 next to said plane across both faces. The contact surfaces are subjected to beam welding to each other, by which the cam shaft is produced. |
