Yamaha Hatsudoki Kabushiki Kaisha

Takayoshi Fukuda

Shidehiko Miyashiro

Takehisa Katsura

Takushiro Shiraishi

Hiroshi Yamaoka

Sin Yokomizo

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.

Vehicle body frame for motorcycle

A number of embodiments of motorcycle constructions having frame made up of box shaped cross section main frame members that extend downwardly and rearwardly at an acute angle to the head pipe. The radiator covers, seat and frame are configured and constructed in such a way as to provide a smooth continuous surface for gripping between the legs of a rider. In some embodiments, this continuous surface is provided by the frame, radiator covers and seat directly and in other embodiments covers are provided over the main frame members to provide the continuous surface either by separate elements or by extension of the radiator covers.

Motorcycle

Growing community of inventors

Shizuoka-ken, Japan

Takayoshi Fukuda