| 摘要 |
PROBLEM TO BE SOLVED: To provide a vehicle body frame for a motorcycle capable of reducing structure members, and improving welding workability and a yield of material. SOLUTION: In the motorcycle vehicle body frame composed of one pipe-shaped main frame portion 2 and a pivot supporting frame portion 3 extending downward from a rear end portion of the main frame portion 2, left side half portions of a main frame portion 2 and the pivot supporting frame portion 3 are structured by a semi-cylindrical left frame half element 27L made from a series of plate materials, and right side half portions are structured by a semi-cylindrical right frame half element 27R made from the series of plate material. Opposite end portions of the left frame half element 27L and the right frame half element 27R are united with each other to structure a hollow structure. A cross section of the main frame portion 2 is made to be polygonal. COPYRIGHT: (C)2007,JPO&INPIT
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