| 摘要 |
Object: To provide a body frame for a motorcycle, including a head pipe for steerably supporting a front wheel and a pair of right and left main frames having hollow square cross-sections and extending rearwardly, downwardly from the head pipe, wherein an upper end portion of an engine is disposed between lower portions of the main frames, which body frame is intended to make compact the vehicular body while ensuring a space for disposing the upper end portion of the engine between both the main frames and to prevent a reduction in rigidity of the main frames. Solving Means: A main frame (14) is formed into a pipe having a Continuous outer peripheral surface. The pipe has a transverse cross-sectional shape composed of a lower half (14a) extending substantially upright on each side of an upper portion of an engine (E) and an upper half (14b) curved from the upper end of the lower half (14a) onto a vehicular center line (C) side. <IMAGE> |
