Cone nut for hydraulic machine

The invention provides a cone nut for a hydraulic machine. The cone nut for the hydraulic machine is used in conjunction with a pull rod of the hydraulic machine. The cone nut is formed by integral connection of a cylinder and a cone; a transition fillet is formed between a nut contact surface and the cone; a specialized saw tooth thread for the hydraulic machine is formed in inner hole of the cylinder and the cone by machining from the end surface of the cone; a circular hole for fastening the cone nut is formed in the outer surface of the cylinder by machining; the cone nut for the hydraulic machine is screwed into the pull rod of the hydraulic machine; the nut contact surface is in contact with a supporting surface A; along with the gradual increase of fastening torque, the stress of the cone nut for the hydraulic machine gradually increases, the axis of the cone slightly elongates, thereby realizing the purpose of reducing thread stress. The cone nut for the hydraulic machine has the beneficial effects that the axial local rigidity of the structure is reduced, thereby achieving the purpose of homogenizing load, the stress concentration is reduced, the reliability of the nut and the machining cost of the nut are reduced, and the cone nut is applied to the technical fields of metallurgy and the like.