Electric scooter

1. An electric scooter in which a front end part of a swing arm is swingably supported on a vehicle body frame having a head pipe that steerably supports handlebars and a front fork axially supporting a front wheel, a down frame extending downwardly to the rear from the head pipe, a lower frame extending to the rear from a rear end of the down frame so as to be covered by a low floor of a vehicle body cover from above, and a pair of left and right rear frames provided to be connected to a rear end part of the lower frame and inclined so as to go upwardly to the rear at least beneath a riding seat, a power unit employing an electric motor as a power source is provided on the swing arm, a rear wheel is axially supported on a rear part of the swing arm, and a battery box housing a battery supplying power to the electric motor is disposed between the pair of left and right rear frames beneath the riding seat,

wherein a single support shaft swingably supporting the front end part of the swing arm on the vehicle body frame is disposed beneath the battery box, the vehicle body frame comprises a pair of subframes that are separate members from the lower frame and the rear frames and that support the battery box, and a pair of pivot frames that are provided to be connected to lower parts of the subframes respectively and extend downwardly, the support shaft being provided between the two pivot frames, and

a pair of support tube portions are provided in upper parts at the front end of the swing arm, the support shaft being inserted through the support tube portions, and the support shaft is provided between lower parts at a rear end of the pair of pivot frames so as to form a gap, which enables interference of the swing arm with the battery box to be avoided, between a lower face at a rear end of the battery box supported by the subframes and an upper face of the swing arm immediately beneath the rear end of the battery box.

2. The electric scooter according to claim 1 , wherein a central axis of the support shaft is disposed beneath a center of rotation of the rear wheel.

3. The electric scooter according to claim 1 , wherein a central axis of the support shaft is disposed further forward than a rear face of the battery box.

4. An electric scooter in which a front end part of a swing arm is swingably supported on a vehicle body frame having a head pipe that steerably supports handlebars and a front fork axially supporting a front wheel, a down frame extending downwardly to the rear from the head pipe, a lower frame extending to the rear from a rear end of the down frame so as to be covered by a low floor of a vehicle body cover from above, and a pair of left and right rear frames provided to be connected to a rear end part of the lower frame and inclined so as to go upwardly to the rear at least beneath a riding seat, a power unit employing an electric motor as a power source is provided on the swing arm, a rear wheel is axially supported on a rear part of the swing arm, and a battery box housing a battery supplying power to the electric motor is disposed between the pair of left and right rear frames beneath the riding seat,

wherein a single support shaft swingably supporting the front end part of the swing arm on the vehicle body frame is disposed beneath the battery box, the vehicle body frame comprises a pair of subframes that are separate members from the lower frame and the rear frames and that support the battery box, and a pair of pivot frames that are provided to be connected to lower parts of the subframes respectively and extend downwardly, the support shaft being provided between the two pivot frames, and

wherein a main stand is pivotably supported on the support shaft.

5. An electric scooter in which a front end part of a swing arm is swingably supported on a vehicle body frame having a head pipe that steerably supports handlebars and a front fork axially supporting a front wheel, a down frame extending downwardly to the rear from the head pipe, a lower frame extending to the rear from a rear end of the down frame so as to be covered by a low floor of a vehicle body cover from above, and a pair of left and right rear frames provided to be connected to a rear end part of the lower frame and inclined so as to go upwardly to the rear at least beneath a riding seat, a power unit employing an electric motor as a power source is provided on the swing arm, a rear wheel is axially supported on a rear part of the swing arm, and a battery box housing a battery supplying power to the electric motor is disposed between the pair of left and right rear frames beneath the riding seat,

wherein a single support shaft swingably supporting the front end part of the swing arm on the vehicle body frame is disposed beneath the battery box, the vehicle body frame comprises a pair of subframes that are separate members from the lower frame and the rear frames and that support the battery box, and a pair of pivot frames that are provided to be connected to lower parts of the subframes respectively and extend downwardly, the support shaft being provided between the two pivot frames, and

wherein a middle part in the vehicle width direction of a cross pipe that extends in the vehicle width direction and is disposed beneath the battery box is fixed to the rear end part of the lower frame, and front end parts of the pair of rear frames are fixed to opposite end parts of the cross pipe.

6. An electric scooter in which a front end part of a swing arm is swingably supported on a vehicle body frame having a head pipe that steerably supports handlebars and a front fork axially supporting a front wheel, a down frame extending downwardly to the rear from the head pipe, a lower frame extending to the rear from a rear end of the down frame so as to be covered by a low floor of a vehicle body cover from above, and a pair of left and right rear frames provided to be connected to a rear end part of the lower frame and inclined so as to go upwardly to the rear at least beneath a riding seat, a power unit employing an electric motor as a power source is provided on the swing arm, a rear wheel is axially supported on a rear part of the swing arm, and a battery box housing a battery supplying power to the electric motor is disposed between the pair of left and right rear frames beneath the riding seat,

wherein a single support shaft swingably supporting the front end part of the swing arm on the vehicle body frame is disposed beneath the battery box, the vehicle body frame comprises a pair of subframes that are separate members from the lower frame and the rear frames and that support the battery box, and a pair of pivot frames that are provided to be connected to lower parts of the subframes respectively and extend downwardly, the support shaft being provided between the two pivot frames, and

wherein a reinforcing frame is fixed to rear end parts of the pair of subframes, the reinforcing frame being made into a substantially U-shaped form opening upward, and opposite end parts of the reinforcing frame are fixed to the rear frames.

7. An electric scooter in which a front end part of a swing arm is swingably supported on a vehicle body frame having a head pipe that steerably supports handlebars and a front fork axially supporting a front wheel, a down frame extending downwardly to the rear from the head pipe, a lower frame extending to the rear from a rear end of the down frame so as to be covered by a low floor of a vehicle body cover from above, and a pair of left and right rear frames provided to be connected to a rear end part of the lower frame and inclined so as to go upwardly to the rear at least beneath a riding seat, a power unit employing an electric motor as a power source is provided on the swing arm, a rear wheel is axially supported on a rear part of the swing arm, and a battery box housing a battery supplying power to the electric motor is disposed between the pair of left and right rear frames beneath the riding seat,

wherein a single support shaft swingably supporting the front end part of the swing arm on the vehicle body frame is disposed beneath the battery box, the vehicle body frame comprises a pair of subframes that are separate members from the lower frame and the rear frames and that support the battery box, and a pair of pivot frames that are provided to be connected to lower parts of the subframes respectively and extend downwardly, the support shaft being provided between the two pivot frames, and

wherein a middle part in the vehicle width direction of a cross pipe that extends in the vehicle width direction is fixed to the rear end part of the lower frame, and the pair of the subframes are connected to rear faces of opposite end parts of the cross pipe between the pair of left and right rear frames and extend rearwardly.