| 摘要 |
PROBLEM TO BE SOLVED: To reduce the weight of a body frame by forming the frame in a hollow structure and allow the periphery of a shaft support part of a swing arm to have high rigidity.SOLUTION: The vehicle body frame structure of a motor cycle comprises a front frame which extends rearward and downward while widening from a head pipe and a body frame which is joined with a rear end of the front frame and supports a swing arm. The body frame, in which are formed integrally left and right body parts 3a joined with a read end of the front frame and upper and lower bridge parts 3b and 3c of the left and right body parts 3a, has: solid structures 22 at a midway position between the left and right body parts 3a; has a hollow structure 23 which is continuous at the upper parts of the left and right body parts 3a and at the upper bridge part 3b vertically across the solid structures 22; and has a hollow structure 24 which is continuous at lower parts of the left and right frames 3b and at the lower bridge part 3c. In the solid structures 22 of the body parts 3a are provided pivot parts 4, shaft support parts of the swing arm. |
