Output shaft

The utility model provides an output shaft belongs to mechanical technical field. It has solved the current short -lived problem of output shaft. This output shaft includes the column body, has all offered the bolt hole on the face of body both ends, and body wherein one end has an external splines, and the body middle part has tooth, and this is internal to have heat dissipation channel, and theheat dissipation channel both ends lie in two bolt hole diapires respectively, the heat dissipation unit of a plurality of along body axial equipartition have on the body other end, heat dissipation unit just all is conical heat dissipation through -hole by at least two and constitutes, heat dissipation through -hole axial is mutually perpendicular with the body axial, one of them port of heat dissipation through -hole and heat dissipation channel intercommunication, another port of heat dissipation through -hole lies in the body surface, heat dissipation diameter of hole is reduced to body inside by the body outside