Method for forming a high-tooth spline of a hollow shaft and hollow shaft having a high-tooth spline
AssigneesAisin Seiki Kabushiki Kaisha, Aisin Ai Co., Ltd.
InventorsNorihito Yokota, Hiroyuki Ikuta, Hitoshi Nakai
Life of this patent
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Abstract
A method for forming a high-tooth spline of a hollow shaft which comprises a step of press-inserting a workpiece of a hollow shaft into a die having a spline-shaped internal surface by a punch, for backing up a portion of the workpiece corresponding to the spline-shaped surface of the die from the inside thereof, having a tip portion made of a material having a hardness lower than that of the die, and a step of forming a spline portion on the workpiece. A hollow shaft having a high-tooth spline formed by the above method.
Claims18
A method for forming a high-tooth spline of a hollow shaft comprising:
- a step of press-inserting a workpiece of a hollow shaft into a die having a spline-shaped internal surface using a punch which backs up a portion of said workpiece corresponding to said spline-shaped surface of said die from the inside thereof, the punch having a tip portion made of a material having a hardness lower than that of said die, and
- a step of forming a spline portion on said workpiece.
A hollow shaft having a high-tooth spline comprising:
- a hollow shaft body having
- a spline portion which is formed by press-inserting said hollow shaft body as a workpiece into a die having a spline-shaped internal surface using a punch which backs up a portion of said hollow shaft body corresponding to said spline-shaped surface of said die from the inside thereof, the punch having a mandrel made of material having a hardness lower than that of said die.
Dependencies are inferred from the claim text.