Patent ID: 8496083

Claim:
A rear wheel suspension device of a motorcycle, comprising: a knuckle member, the knuckle member including: a rear wheel support portion for pivotally supporting a rear wheel of the motorcycle; a lower arm portion inclined downwardly from the rear wheel support portion toward a front end of the motorcycle; and an upper arm portion inclined upwardly from the rear wheel support portion toward the front end of the motorcycle; an upper arm member, the upper arm member having a front end portion thereof pivotally supported on a vehicle body frame and extending rearwardly, a rear end portion of the upper arm member being rotatably joined to the upper arm portion of the knuckle member; a lower arm member, the lower arm member having a front end portion thereof pivotally supported on the vehicle body frame and extending rearwardly below the upper arm member, a rear end portion of the lower arm member being rotatably joined to the lower arm portion of the knuckle member, wherein the rear end portion of one of the upper arm member and the lower arm member extends to inside an outer periphery of the rear wheel of the motorcycle as viewed in a side view of the motorcycle, and is joined to the knuckle member, the one of the upper arm member and the lower min member being defined as a swing arm, and the other one of the upper arm member and the lower arm member being defined as the other arm; and a rear cushion unit, one end of the rear cushion unit being joined to the swing arm and the other end of the rear cushion unit being joined to either the other arm or one of the upper arm portion and the lower arm portion of the knuckle member that is joined to the other arm, wherein a joint of the rear end portion of the other arm and a corresponding one of the lower arm portion and the upper arm portion of the knuckle member is located outside the outer periphery of the rear wheel of the motorcycle as viewed in the side view of the motorcycle.