Patent ID: 7350391

Claim:
A method for manufacturing a clutch housing, comprising: a first step of forming a work into a pre-product having a shaft portion and an outer drum portion enclosing the shaft portion integrally with the shaft portion; a second step of working the pre-product, including forming a hole in said shaft portion, said hole extending substantially perpendicular to an axial direction of said shaft portion; and a third step of providing a spline on an inner periphery of the outer drum portion by flow forming, and forming the pre-product into an almost completed product, wherein in the first step, an outer peripheral cylindrical portion of the outer drum portion is formed while being offset in an axial direction with respect to the shaft portion so that it is not opposite, in a radial direction, to a region where said hole is to be formed in the second step, and wherein in the third step, said outer peripheral cylindrical portion of the outer drum portion is further formed so that a part of said outer peripheral cylindrical portion is radially opposite said region where said hole is formed.