| 摘要 |
PROBLEM TO BE SOLVED: To increase the degree of freedom of an engine shape by enlarging a space under a main pipe and to realize optimization of operation property by giving suitable flexibility to a vehicle body frame in a scooter type motorcycle having a leg putting space of an approximately U shape in side view between a head pipe provided on a front end of a vehicle body frame while steerably supporting a front fork for pivotally supporting a front wheel and a riding seat seated with a vehicle driver for operating steering handle connected to an upper part of the front fork. SOLUTION: In a pair of left and right main pipes constituting a part of the vehicle body frame F, a front inclination part 20a extending from a lower pipe 19 in a rear upward direction and continuously provided with a lower end of a down pipe 18 on a midway part; a rear inclination part 20b extending in a rear downward direction; a curved part 20c curved so as to be upwardly expanded and connecting a rear end of the front inclination part 20a and a front end of the rear inclination part 20b are integrally continuously formed. COPYRIGHT: (C)2006,JPO&NCIPI
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