Fuji Electronics Industry Co., Ltd.

Honda Motor Co., Ltd.

Hiroko Watanabe

Junji Minoue

Masayuki Koyama

Hideo Miyashita

Ryosuke Fukuchi

Junko Tanaka

Yasufumi Nakai

Masayuki Orihara

Akihiro Hanaki

Hiroaki Mase

Yasuaki Matsumoto

A heating apparatus () includes a high frequency power supply (), a left conductive plate (), a right conductive plate (), a left heating coil (), and a right heating coil (). The left heating coil () includes a left conductor portion (). The left conductor portion () faces a gear tooth () of a helical gear () and extends in a direction orthogonal to the direction in which the gear tooth () extends. The left heating coil () includes a focusing magnetic body () which focuses magnetic flux in the left conductor portion () and concentrates the magnetic flux on a surface of the gear tooth (). The left heating coil () includes an upper inducing magnetic body () which induces a part of the magnetic flux flowing in a tooth root of the gear tooth () into a tooth tip of the gear tooth ().

Heating coil

An object of the present invention is to provide a hardening method and a hardening device capable of successfully hardening a shaft and an inner wall of a hole of a work in which the hole is formed close to the shaft on a flat plate. A hardening device for hardening a shaft and an inner wall of a hole, the shaft extending vertically from a flat plate and the hole being formed adjacent to the shaft, includes a first heating coil that is a conductive body facing the shaft and a second heating coil that is a helical conductive body having at least a portion inserted into the hole, so that the first heating coil and the second heating coil heat the shaft and the inner wall of the hole respectively and simultaneously.

Hardening device

Hardening method and hardening device

Growing community of inventors

Osaka, Japan

Hiroko Watanabe