Honda Motor Co., Ltd.

Masaki Agata

Hiroyuki Yoshida

Kazuhiko Gogo

Mikio Uchiyama

An aluminum base part is composed of a forging cast product produced by a forging cast process and a nickel chromium plating layer formed on the forging cast product. The nickel chromium plating layer is composed of a semibright nickel plating layer formed on the forging cast product and having a thickness of 5 to 10 &#x3bc;m, a bright nickel plating layerformed on the semibright nickel plating layerand having a thickness of 5 to 10 &#x3bc;m, and a chromium plating layerformed on the bright nickel plating layerand having a thickness of 0.5 to 3 &#x3bc;m. The present invention adopts a forging cast product rather than a cast product. The forging cast product has a smooth surface, so that a plating layer can be directly formed on the surface of the forging cast product without forming an undercoat resin layer.

Method of producing an aluminum base part

A wheel for a two-wheeled motor vehicle and including a hub, a rim, a spokes coupling the hub and the rim. The hub has a lightening portion formed inside a sprocket flange such that there remains sufficient flange strength and sufficient weight reduction is realized. The lightening portion is axially inside a bearing insertion hole, opens radially inwardly and has a maximum diameter longer than diameters of the bearing insertion hole and an axle hole.

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Wako, Japan

Masaki Agata