Mechanism, comprising: - a base; - a pendulum mounted pivotally in relation to the base about a pendulum axis; - a first eccentric element generating a first moment of gravitational force about a first axis; - a second eccentric element generating a second moment of gravitational force about a second axis; and - a synchronization system for synchronizing the first eccentric element and the second eccentric element according to a synchronized counter-rotating rotational movement (R1/R2). wherein: - the pendulum axis and the axes (A1; A2) of the eccentric elements (10; 20) are parallel and arranged in a same plane integral to the pendulum; - the axes (A1; A2) of the eccentric elements (10; 20) are supported by the pendulum; and - when the mechanism is in operation: - the axes (A1; A2) of the eccentric elements (10; 20) are supported by the pendulum, respectively above and below the pendulum axis; and - the eccentric elements (10; 20) are movable in synchronized counter-rotating rotation (R1; R2), with cross-centrifugations, - the pendulum pivots alternately (B1; B2) on one side then the other, amplifying the rotational movement (R1; R2) of the eccentric elements (10; 20), by means of simultaneous cross-thrusts of the pendulum against the axes (A1; A2) of said eccentric elements (10; 20), and by the transmission of torque to the synchronization system, and - the energy generated by centrifugation within the mechanism is recoverable by coupling an energy recovery system to the synchronization system. - a base; - a pendulum mounted pivotally in relation to the base about a pendulum axis; - a first eccentric element generating a first moment of gravitational force about a first axis; - a second eccentric element generating a second moment of gravitational force about a second axis; and - a synchronization system for synchronizing the first eccentric element and the second eccentric element according to a synchronized counter-rotating rotational movement (R1/R2). - the pendulum axis and the axes (A1; A2) of the eccentric elements (10; 20) are parallel and arranged in a same plane integral to the pendulum; - the axes (A1; A2) of the eccentric elements (10; 20) are supported by the pendulum; and - when the mechanism is in operation: - the axes (A1; A2) of the eccentric elements (10; 20) are supported by the pendulum, respectively above and below the pendulum axis; and - the eccentric elements (10; 20) are movable in synchronized counter-rotating rotation (R1; R2), with cross-centrifugations, - the pendulum pivots alternately (B1; B2) on one side then the other, amplifying the rotational movement (R1; R2) of the eccentric elements (10; 20), by means of simultaneous cross-thrusts of the pendulum against the axes (A1; A2) of said eccentric elements (10; 20), and by the transmission of torque to the synchronization system, and - the energy generated by centrifugation within the mechanism is recoverable by coupling an energy recovery system to the synchronization system. - the axes (A1; A2) of the eccentric elements (10; 20) are supported by the pendulum, respectively above and below the pendulum axis; and - the eccentric elements (10; 20) are movable in synchronized counter-rotating rotation (R1; R2), with cross-centrifugations, - the pendulum pivots alternately (B1; B2) on one side then the other, amplifying the rotational movement (R1; R2) of the eccentric elements (10; 20), by means of simultaneous cross-thrusts of the pendulum against the axes (A1; A2) of said eccentric elements (10; 20), and by the transmission of torque to the synchronization system, and - the energy generated by centrifugation within the mechanism is recoverable by coupling an energy recovery system to the synchronization system.