Dual-clutch mechanism comprising: - a first clutch and a second clutch rotating about a central hub; - a first actuation system arranged to engage or disengage the first clutch; - a second actuation system arranged to engage or disengage the second clutch, each actuation system (300A, 300B) comprising: ∘ a pressure chamber (750A, 750B) arranged to receive a pressurized fluid; ∘ a piston (105, 205) movable axially in the pressure chamber (750A, 750B) and extending radially outside the pressure chamber (750A, 750B) in order to engage or to disengage the corresponding clutch (100, 200); ∘ a balancing chamber (700A, 700B) situated on the opposite side of the pressure chamber (750A, 750B) with respect to the piston (105, 205), ∘ an elastic return element (800A, 800B) housed in the balancing chamber, said elastic return element (800A, 800B) extending between the corresponding piston (105, 205) and the central hub, said elastic return element (800A, 800B) being arranged to exert an axial force against said piston (105, 205); said elastic return element comprising a plurality of openings; characterized in that, in each actuation system (300A, 300B), said plurality of openings opens directly into a plurality of complementary openings made in the central hub in order to allow fluid communication between a fluid circulation duct of the central hub and the balancing chamber (700A, 700B). - a first clutch and a second clutch rotating about a central hub; - a first actuation system arranged to engage or disengage the first clutch; - a second actuation system arranged to engage or disengage the second clutch, each actuation system (300A, 300B) comprising: ∘ a pressure chamber (750A, 750B) arranged to receive a pressurized fluid; ∘ a piston (105, 205) movable axially in the pressure chamber (750A, 750B) and extending radially outside the pressure chamber (750A, 750B) in order to engage or to disengage the corresponding clutch (100, 200); ∘ a balancing chamber (700A, 700B) situated on the opposite side of the pressure chamber (750A, 750B) with respect to the piston (105, 205), ∘ an elastic return element (800A, 800B) housed in the balancing chamber, said elastic return element (800A, 800B) extending between the corresponding piston (105, 205) and the central hub, said elastic return element (800A, 800B) being arranged to exert an axial force against said piston (105, 205); said elastic return element comprising a plurality of openings; ∘ a pressure chamber (750A, 750B) arranged to receive a pressurized fluid; ∘ a piston (105, 205) movable axially in the pressure chamber (750A, 750B) and extending radially outside the pressure chamber (750A, 750B) in order to engage or to disengage the corresponding clutch (100, 200); ∘ a balancing chamber (700A, 700B) situated on the opposite side of the pressure chamber (750A, 750B) with respect to the piston (105, 205), ∘ an elastic return element (800A, 800B) housed in the balancing chamber, said elastic return element (800A, 800B) extending between the corresponding piston (105, 205) and the central hub, said elastic return element (800A, 800B) being arranged to exert an axial force against said piston (105, 205); said elastic return element comprising a plurality of openings;