| 摘要 |
PROBLEM TO BE SOLVED: To provide a rear frame structure for a motor cycle capable of securing the same degree of strength with a thinner and lighter structure compared with structure of conventional rear frames which are formed by die cast.SOLUTION: The rear frame structure 39 comprises: an upper member 47 which is an extrusion shape having a traverse shape which is concave shape being opened downward along the whole length and having a thicker part 46 which is thicker than other parts at a corner part 45 of a ceiling wall 41 and right-and-left side walls 42,43; and a lower member 48 having a traverse shape which is a concave shape being opened upward along the whole length and being assembled to the upper member 47. |
