Automatic centring hydraulic clamp for automobile hub bore system machining

The utility model discloses an automatic centring hydraulic clamp for automobile hub bore system machining. The automatic centring hydraulic clamp for automobile hub bore system machining comprises a fixture base, wherein a conical location disc base is fixedly installed at the central position of the fixture base; an automatic hydraulic centring device is installed on the location disc base, and a plurality of support clamping devices are annularly arranged on the fixture base. According to the automatic centring hydraulic clamp for automobile hub bore system machining disclosed by the utility model, the conical location disc base is matched with a conical tensioning sleeve, a hydraulic tensioning cylinder applies an acting force on a sealing gland through a locking nut on a pull rod shaft, when the conical tensioning sleeve is stressed by the downward acting force of the sealing gland, the diameter direction of the conical tensioning sleeve is increased, the conical tensioning sleeve is tensioned on the inner wall of a workpiece, and the deflection of the central position degree of a bore system due to the wear of the conical sleeve is avoided; after the workpiece is machined, the hydraulic tensioning cylinder is released, and the conical tensioning sleeve rebounds under the action of the own elasticity, thus a certain gap is generated between the conical tensioning sleeve and the workpiece, and the workpiece is convenient to take out.