| 摘要 |
PROBLEM TO BE SOLVED: To make a hollow part of a top bridge small, and to make the hollow part as lightweight and highly rigid as possible. SOLUTION: The top bridge 8 is cast by an aluminum alloy. An arm-shaped bridge part 45 extending in a right and left direction has a center hole 34 at the center. The front fork bracket is provided with a center boss 40, fork bosses 41 having fork holes 37 on right and left sides, and a handlebar mounting boss 44 having a mounting hole 31 to mount a handlebar clamp for supporting the handlebar 12 in the middle of the fork bosses 41. An open recessed part 46 opened downward is provided in front of the center boss 40. The front fork bracket is provided with the hollow part 47 communicated with the open recessed part 46 and the fork holes 37 and formed by avoiding the center boss 40 and the handlebar mounting boss 44. The hollow part 47 can be made smaller by the open recessed part 46, and the whole is made as lightweight and highly rigid as possible. COPYRIGHT: (C)2008,JPO&INPIT
|
