Series-hybrid vehicle

1. A series-hybrid vehicle comprising:

a vehicle body frame;

a pair of right and left front wheels suspended from a front portion of the vehicle body frame;

a pair of right and left rear wheels suspended from a rear portion of the vehicle body frame;

a drive motor mounted to the vehicle body frame and configured to drive the front wheels or the rear wheels;

a battery mounted to a center portion of the vehicle body frame in a forward and rearward direction and configured to supply electric power to the drive motor;

an engine electric generator including an electric generator for generating electric power charged into the battery and an engine for actuating the electric generator;

a driver seat configured to seat a driver;

a cargo bed provided behind the driver seat;

an engine room in which the engine electric generator is accommodated, the engine room being provided below the cargo bed; and

a cargo bed displacement mechanism for displacing the cargo bed;

wherein the driver seat is positioned rightward or leftward relative to a center portion of the vehicle body frame in a vehicle width direction;

wherein the engine is accommodated in the engine room such that the engine is positioned at an opposite side of the driver seat relative to the center portion of the vehicle body frame in the vehicle width direction; and

wherein the cargo bed displacement mechanism is configured to displace the cargo bed between a first position in which the cargo bed covers an upper opening of the engine room, and a second position in which the upper opening of the engine room is open.

2. The series-hybrid vehicle according to claim 1 , further comprising:

a heat radiation plate positioned below the cargo bed in the first position and at one side end portion of the vehicle body frame in the vehicle width direction; wherein

at least one of an electric generator controller for controlling electric power from the engine electric generator to the battery and a drive motor controller for controlling electric power supply from the battery to the drive motor is mounted to the heat radiation plate.

3. The series-hybrid vehicle according to claim 1 , further comprising:

a heat radiation plate positioned below the cargo bed in the first position and at one side end portion of the vehicle body frame in the vehicle width direction; wherein

a drive motor controller for controlling electric power supply from the battery to the drive motor is mounted to the heat radiation plate; and

the heat radiation plate is positioned above the drive motor.

4. A series-hybrid vehicle comprising:

a vehicle body frame;

a pair of right and left front wheels suspended from a front portion of the vehicle body frame;

a pair of right and left rear wheels suspended from a rear portion of the vehicle body frame;

a drive motor mounted to the vehicle body frame and configured to drive the front wheels or the rear wheels;

a battery mounted to a center portion of the vehicle body frame in a forward and rearward direction and configured to supply electric power to the drive motor;

an engine electric generator including an electric generator for generating electric power charged into the battery and an engine for actuating the electric generator;

a driver seat on which a driver is seated;

a cargo bed provided behind the driver seat; and

a fuel tank for storing a fuel supplied to the engine, the fuel tank being laid out such that the fuel tank and the engine are positioned at a same side relative to the center portion of the vehicle body frame in the vehicle width direction;

wherein the driver seat is positioned rightward or leftward relative to a center portion of the vehicle body frame in a vehicle width direction; and

the engine is positioned below the cargo bed at an opposite side of the driver seat relative to the center portion of the vehicle body frame in the vehicle width direction,

wherein the fuel tank is positioned behind a front end of the driver seat and forward relative to a rear end of the engine, in the forward and rearward direction.

5. A series-hybrid vehicle comprising:

a vehicle body frame;

a pair of right and left front wheels suspended from a front portion of the vehicle body frame;

a pair of right and left rear wheels suspended from a rear portion of the vehicle body frame;

a drive motor mounted to the vehicle body frame and configured to drive the front wheels or the rear wheels;

a battery mounted to a center portion of the vehicle body frame in a forward and rearward direction and configured to supply electric power to the drive motor;

an engine electric generator including an electric generator for generating electric power charged into the battery and an engine for actuating the electric generator;

a driver seat configured to seat a driver;

a cargo bed provided behind the driver seat;

an engine room in which the engine electric generator is accommodated, the engine room being provided below the cargo bed; and

a cargo bed displacement mechanism for displacing the cargo bed;

wherein the cargo bed displacement mechanism is configured to displace the cargo bed between a first position in which the cargo bed covers an upper opening of the engine room, and a second position in which the upper opening of the engine room is open.