Topy Kogyo Kabushiki Kaisha

Morishi Kunou

Shingo Tsukui

Kishiro Abe

Satoru Miyashita

Shojiro Yokomizo

Katsuki Kato

Tsuneo Watanabe

Susumu Itou

Katsunori Todoko

Kenji Hayashi

Nobuyuki Soma

Takenobu Hasegawa

Masaaki Hara

Kenichi Inada

Kishirou Abe

A rim material having a non-uniform thickness, a rim manufactured from the rim material, and a method for manufacturing the rim from the rim material. The rim material includes a first material portion which forms an axially curved portion of the rim after the rim material is formed to the rim and a second material portion which forms an intermediate portion between adjacent axially curved portions after the rim material is formed to the rim. The first material portion has a thick parallel-surface portion including opposite surfaces parallel to each other. The parallel-surface portion has a width greater than a maximum amount of an axial dislocation of the parallel-surface portion expected to occur when the parallel-surface portion is formed to a corresponding curved portion. The second material portion has a thickness varying portion. The thickness varying portion includes a surface having a configuration defined by a line including a straight line and/or a slightly curved line.

Rim having a non-uniform thickness

A method shaping and machining a disc wheel and an equipment therefor wherein, in a disc wheel formed by welding together a rim and a disc, upper and lower mandrels are inscribed with rim bead seat portions formed on both sides of the rim, while upper and lower spinning rolls are pressed against the outer peripheries of the rim bead seat portions for spinning of the latter, and a hub hole formed in the disc is machined with a cutter which is concentric with the upper and lower mandrels, thereby effecting a high accuracy in shaping and machining a disc wheel.

Method of shaping and machining disc wheel and equipment therefor

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Ayashi, Japan

Morishi Kunou