| 摘要 |
PROBLEM TO BE SOLVED: To provide a rear swing arm capable of adjusting stiffness in a car width direction while suppressing great reduction of torsional stiffness to improve travel feeling.SOLUTION: A rear wheel suspension structure of a motor cycle includes a rear swing arm 5 having one end supported on a car body to be swung and a rear wheel rotatably supported at the other end. The rear swing arm 5 includes a pair of left and right arm parts 20 and 20, a cross member 21 hung between the pair of left and right arm parts 20 and 20, and a pair of left and right gusset plates 22 and 22 for connecting the rear surface side of the cross member 21 and the inner surface side of the arm part 20. The gusset plate 22 includes an upper plate part 40 and a drooping part drooping from its edge part. In the drooping part, a notched part 42 notched from the lower end toward the edge part of the upper plate part 40, and stiffness in a car width direction is reduced while great reduction of torsional stiffness is suppressed. |
