Aisin Aw Co., Ltd.

Masahiro Gotou

Hideyuki Nagai

Hiroshi Katou

Naohisa Momiyama

Masaki Nakajima

Daisuke Iwata

Osamu Fukukawa

Masahiro Ishikawa

Ken Shimizu

Yuji Nakai

Tomohiro Sugiura

Masaki Saitou

The disclosed method produces a spline-grooved cylindrical member, e.g. torque converter front cover, including a cylindrical portion having a target wall thickness t from a plate blank having a plate thickness t An outer peripheral portion of a disc-shaped blank is plastically deformed by pressing it against a mandrel with the concave peripheral edge of a thickness-increasing roller, so that a thick wall portion, of a thickness greater than the plate thickness t of the blank, is formed in the cylindrical portion. The thick wall portion is then pressed against the mandrel by forming rollers to form spline grooves therein. Thus, the other portions of the product have a wall thickness which is not unnecessarily increased. In this manner, the wall thickness t of the cylindrical portion is not entirely dictated by the wall thickness t of the blank material. Thus, a cylindrical member resistant to high pressures acting on its axially-extending outer cylindrical portion can be produced with an optimal configuration.

Method for producing cylindrical member having spline grooves, and cylindrical member having spline grooves

The present invention provides an internally-toothed member of reduced size and enhanced quality, durability and productivity in manufacture. This internally-toothed member has a first cylinder portion and a second cylinder portion which is larger in diameter than the first cylinder portion. First and second internal teeth are formed to protrude radially inwardly from inner peripheral surfaces of the first and second cylinder portions respectively. Because a meshing portion can be formed as second internal teeth protruding from an inner periphery of the second cylinder portion, the diameter of the internally-toothed member is relatively small. Because the area between the second internal teeth and a concave portion and the concave portion itself do not decrease in thickness during formation of the second internal teeth, it is possible to prevent cracking and to thereby enhance durability of the internally-toothed member. Further, because there is no sagging of the inner peripheral surface of the meshing portion, the quality of the internally-toothed member is further enhanced.

Internally-toothed member, and method and apparatus for molding same

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Anjo, Japan

Masahiro Gotou