Closing system for vehicle supply system

A closing system for allowing or limiting access to a supply system of a vehicle, the closing system comprising:

• a frame, configured to be mounted on a body of the vehicle in correspondence with the supply system, the frame being shaped as a spherical segment, extending between a first circular section and a second circular section and comprising a plurality of first guides and a plurality of second guides, arranged on a radially outer surface;
• a plurality of curved panels, each curved panel of said plurality of curved panels being essentially shaped as a part of a spherical cap and constrained, at a first end, to slide along a respective first guide of said plurality of first guides and, at a second end, to slide along a respective second guide of said plurality of second guides between a first position, in which said curved panels jointly define an opening that allows access to said supply system, and a second position, in which said curved panels prevent access to the supply system;
• and
• control means for controlling movement of said plurality of curved panels between said first position and said second position.