| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To improve responsiveness of the rotation of each rear wheel to the rotation of a pedal shaft, and to improve steering stability, in a bicycle having the two rear wheels. <P>SOLUTION: This bicycle 1 is provided with a vehicle body main body 4 for supporting a seat frame 3, a front wheel 8 supported in a front part of the vehicle body main body 4, a rear frame 11 extended backward from a rear part side of the vehicle body main body 4, a pair of left and right rear wheels 16 arranged at the left and right outside of a rear end part of the rear frame 11 and supported at the rear end part via a rear axle 15, and the pedal shaft 19 supported at a front end part of the rear frame 11 to interlock with a stepping operation of a pedal 22. The rear frame 11 is formed so that cross section of each part of the longitudinal direction may be closed section. A drive shaft 40 stored in the rear frame 11 to interlock and connect each of the rear wheels 16 with/to the pedal shaft 19 is provided. The rear frame 11 is arranged on almost a vehicle body center 54 in the width direction of the bicycle 1. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
