| 摘要 |
PROBLEM TO BE SOLVED: To provide a vehicle body frame for a motorcycle, in particular, the vehicle body frame for the motorcycle in which a main frame is manufactured by press working of an aluminum pressing material of a flat plate shape integrally formed with a reinforcement rib. SOLUTION: In the vehicle body frame for the motorcycle, a pair of left and right main frames is extended from a head pipe for supporting a steering shaft to a rear side and a swing arm pivot plate is provided on a rear end of the main frame. In the pair of main frames, an inner side surface in a vehicle width direction is formed to a U-shaped opened cross section by press working of an aluminum pressing material of a flat plate shape provided with a reinforcement rib. The reinforcement rib is formed on the inner side surface of the opened cross section from an upper side wall to a lower side wall. COPYRIGHT: (C)2009,JPO&INPIT
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