| 摘要 |
To provide a motorcycle frame structure having a head pipe manufactured by forging that enables a significant reduction in forging costs and enables a reduction in welding costs for a front frame and a down tube. A down tube is welded to an upper tongue, a lower surface of a lower flange section and a lower tongue. A weld bead is provided and it is possible to ensure a sufficiently long weld length with regard to the weld bead. Since only the upper and lower tongues are integrally formed with the forged component, there is no need to include an undercut processing in the forging process. Accordingly, it is possible to reduce the manufacturing cost.
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