Clutch outer

A clutch outer which is formed by die-casting to have a cylindrical portion and an end wall leading to one end of said cylindrical portion, and in which slits are defined in said cylindrical portion at a plurality of points circumferentially equally spaced apart from one another to extend in an axial direction of said cylindrical portion so that one end of each slit is closed by a portion closer to said end wall and the other end of each slit opens into the other end of said cylindrical portion, and engagement claws provided on outer peripheries of a plurality of friction plates are slidably engaged into said slits,

• wherein each of said slits comprises a wide portion which is defined on the side of an inner periphery of said cylindrical portion and into which said engagement claws are engaged, and a narrow portion defined on the side of an outer periphery of said cylindrical portion with a width in a circumferential direction of said cylindrical portion being smaller than that of said wide portion, said wide portion and said narrow portion being connected to each other through a step facing a radially inward direction of said cylindrical portion;
• wherein a draft for said wide portion in the die-casting is set at a value smaller than a draft for said narrow portion;
• and
• wherein a die-parting face in the die-casting is established on the side of the outer periphery of said cylindrical portion.