Gear hobbing clamp of internal spline gear

The utility model provides a gear hobbing clamp of an internal spline gear. The gear hobbing clamp comprises a base, a location disc fixed on the base and a mandrel installed on the base. The mandrel penetrates through the location disc in gap mode, the upper end face of the location disc is perpendicular to the axis of the mandrel, and a press plate is movably sleeved on the mandrel. The gear hobbing clamp is characterized in that the mandrel is provided with a smooth section, an external spline conical sleeve is sleeved on the smooth section of the mandrel, an inner round hole of the external spline conical sleeve is in gap fit with the smooth section of the mandrel, and the external conical face of the external spline conical sleeve is in interference fit with an inner spline of the inner spline gear, so that the gap between the mandrel and the inner spline gear is reduced, clamping accuracy is improved, and accuracy and quality of gear portions undergoing gear hobbing are ensured.