Yamaha Hatsudoki Kabushiki Kaisha

Sin Yokomizo

Shidehiko Miyashiro

Takehisa Katsura

Takushiro Shiraishi

Takayoshi Fukuda

Hiroshi Yamaoka

Norikazu Unno

In a body frame for a motorcycle mounted with an engine unitand provided with a main frameby which a front forkand rear armsare supported, the main frameincludes: a head pipe unitwhich extends obliquely downward to a rear of a vehicle from a head pipeand so as to expand in a vertical direction; a down framewhich is connected to a front part at lower end of the head pipe unit; and left and right rear arm bracketswhich are stretched and connected to a rear end of the down frameand a rear part at lower end of the head pipe unit, and the head pipe unitis an aluminum die-cast molded product, and the down frameand the left and right rear arm bracketsare aluminum forged molded products.

Growing community of inventors

Shizuoka-ken, Japan

Sin Yokomizo