| 主权项 |
1. An independent suspension system of a drive wheel, wherein the drive wheel is vertically swingably supported by a vehicle body frame via the independent suspension system, said independent suspension system including a lower arm, an upper arm disposed over the lower arm, and a cushion unit, wherein
the lower arm has a first arm main part that forms a U-shape in plan view with a first curvature peak oriented toward the drive wheel and has a closed section as a cross-sectional shape and a first vehicle-body-side front joint and a first vehicle-body-side rear joint provided at tip parts of the first arm main part so as to be swingably joined to the vehicle body frame at positions separate from each other in a front-rear direction and swingably joined to a knuckle that pivotally supports the drive wheel, the upper arm has a second arm main part that forms a U-shape in plan view with a second curvature peak oriented toward the drive wheel and has a closed section as a cross-sectional shape and a second vehicle-body-side front joint and a second vehicle-body-side rear joint provided at tip parts of the second arm main part so as to be swingably joined to the vehicle body frame at positions separate from each other in the front-rear direction and swingably joined to the knuckle such that at least part of the second vehicle-body-side rear joint is overlapped with the first vehicle-body-side rear joint in plan view and the second vehicle-body-side front Mint is offset to a rear side relative to the first vehicle-body-side front joint, and the cushion unit, which is disposed on a front side of the second arm main part, is provided between the vehicle body frame and the lower arm. |
