Winch with simplified structure

A winch with simplified structure comprising a supporting frame which comprises:

• a first wall and a second wall which are mutually opposite, a drum which is interposed between said first and second walk and is supported by them so as to rotate about its longitudinal axis which is transverse to said walk, a flexible element for moving a load being wound around the drum, a drive structure associated with said first wall and with a transmission structure for rotationally actuating said drum, which are accommodated inside said drum, and a reaction element which is associated with said second which supports said drum so as to rotate and which is associated with said transmission structure in order to support the transmission structure;
• wherein said transmission structure comprises a planetary gear train which extends along the axis of rotation of said drum and is provided with a driving sun gear which is associated with said drive structure and is engaged with at least two planet gears which are supported so that they can rotate by a planet gear carrier and which are in turn engaged with a ring gear which is associated internally with said drum, the reaction element being associated with the planet gear carrier and with the second wall so as to prevent the rotation of said plant gear carrier;
• wherein said reaction element comprises a pivot with a cross-section, which extends along the axis of rotation of said drum which has a first substantially cylindrical portion which is inserted into a corresponding hole defined in said second wall, a second substantially cylindrical portion which is associated with said drum by interposition of at least one first bearing and a terminal shank for coupling with said transmission structure;
• wherein a detection structure comprises a connection cable that passes through the terminal shank and the second cylindrical portion.