Yutaka Giken Co., Ltd.

Honda Motor Co., Ltd.

Tetsuaki Nakayama

Yasuyuki Watanabe

Hideyuki Ushiyama

Atsumu Naoi

Isao Hirokawa

Toshihiro Kondo

Yoshitoshi Hagiwara

Nobuyuki Yoshitoshi

A heat exchange tube is constructed by forming, on a cylindrical tube peripheral wall, a plurality of projecting portions which project to an inside of the tube peripheral wall, and which are formed by pushing. The plurality of projecting portions are formed, respectively, into conical shapes across a tube axis, and are arranged along virtual spirals on the tube peripheral wall. Accordingly, it is possible to provide a heat exchange tube which facilitates formation of a plurality of projecting portions with the thickness hardly changed and without formation of protruded portions, and which is capable of contributing to enhancement of heat exchanging efficiency.

Heat exchange tube

A metallic bellows is manufactured by a first step of bulging a straight raw pipe into a primary formed body having formed on a periphery thereof a corrugated bellows section, and a second step of subjecting at least one of crest portions and trough portions of the bellows section of the primary formed body to roll machining by means of a pair of forming rolls.

Method of, and apparatus for, manufacturing metallic bellows

Growing community of inventors

Hamamatsu, Japan

Tetsuaki Nakayama