| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing a clutch outer, which can ensure a vertical shape of cam surfaces with respect to a cam bottom (cam bottom part), and which can form highly accurate cam surfaces which can follow a shape of a cam punch. SOLUTION: A clutch outer is provided in a bottomed cylinder having at its one end a cam bottom part 1a and a cylindrical wall 1b whose inner peripheral surface is formed thereon with a plurality of wedge-like cam surfaces 1c. The cam bottom part 1a is formed in the center part thereof with a circular hole in which an inner is inserted, and a plurality of sacrificed shafts 1e are provided on the rear surface side of the cam bottom part 1a. When the cam surfaces 1c are formed on the clutch outer by forging, the plurality of sacrificed shafts 1e are simultaneously formed by fluidity of an excessive thickness part on the rear surface side of the cam bottom part 1a, and accordingly, the fluid speed of a material 10 during formation of the cam surface 1c can be lowered. As a result, recession produced in the cam surfaces 1c can be restrained, thereby it is possible to ensure a vertical shape of the cam surfaces 1c with respect to the cam bottom part 1a. |
