The aplication relates to an energy production device, wherein it comprises a frame, a body, first and second aligned input shafts projecting from two opposite faces of the body, a third input shaft aligned with an output shaft, the direction of the first and second input shafts being perpendicular to the direction of the third input shaft and of the output shaft, mechanical connection means at the proximal part of each of the shafts which is within the body, said mechanical connection means operating with a transmission system within the body so that any rotation movement on any of the input shafts is converted into a unidirectional rotation movement on the output shaft, a distal end of the third input shaft being fixed to the frame, a bearing fixed on said frame, into which the distal end of the output shaft is freewheeling, a first pendulum mounted on a bearing at the distal end of the first input shaft to pivot around the first input shaft and a second pendulum mounted on a bearing at the distal end of the second input shaft to pivot around the second input shaft.