Motor vehicle with a supporting structure of light alloy

Motor-vehicle, comprising:

• a supporting structure formed by a reticular framework (2) of light alloy,
• said reticular framework (2) including two side structures (3) each formed by extruded profile elements (4) welded to cast connector elements (5),
• said side structures (3) being connected to each other by cross members (6, 7, 8, 9) which are also formed by extruded profile elements having their ends connected to said side structures (3) by mechanical coupling means,
• wherein said motor-vehicle has an electric power unit and said reticular framework (2) is connected to a floor panel of composite plastic material (10) including a longitudinal central tunnel-shaped portion (11), said tunnel-shaped portion (11) housing hereunder electric batteries (12) for supplying the electric power mit of the motor-vehicle, and
• wherein said electric power unit forms part of a preassembled power and suspension unit (18) including:
• a supporting cross member (6), formed by an extruded metal profile fixed by mechanical coupling means to the supporting structure (2) of the motor-vehicle,
• a pair of longitudinal arms (19) pivotally connected to the cross member (6) around a common axis (21) parallel to a longitudinal direction of said supporting cross member (6), said arms (19) having free ends on which there are rotatably mounted respective wheel supports (23),
• said electric power unit (24) supported in a cantilever fashion by the supporting cross member (6) by a supporting beam (28) fixed to the supporting cross member (6) and including two axle shafts (27) connected to said wheel supports (23) to transfer thereto torque generated by the electric power unit (24), and
• a pair of suspension members (29) comprising a damping cylinder (30) and a helical spring (31) respectively interposed between the two longitudinal arms (19) and two respective supports (33) fixed to the supporting cross member (6).