| 摘要 |
PURPOSE:To keep the prescribed strength and to simplify and lighten the working by clamping the intermediate part of a hollow tube, shrinking with pressing the hollow tube from both end directions and forming the bearing stepped part and the gear crank attaching part. CONSTITUTION:In the state of clamping the intermediate part of axial direction of a base stock 5 composed of a hollow tube with clamping dies 6, 6, the hollow tube is shrunk by pressing to the direction shrinking the length of base stock 5 with pressing dies 7, 7. And the bearing stepped part is formed with the stepped part corresponding parts 6a, 6a of the clamping dies 6, 6 and the bearing stepped part corresponding shape formed at end parts 7c, 7c of the pressing dies 7, 7, and together the gear crank attaching part is formed with the gear crank attaching part corresponding shape formed at the inner parts 7c, 7c of the pressing dies 7, 7. |
