Automatic clamp that location and terminal surface of expanding in thin wall ring gear part compressed tightly

The utility model discloses an automatic clamp that location and terminal surface of expanding in thin wall ring gear part compressed tightly, characterized by: the connection pad is installed on the lathe spindle ring flange, and the elastic component that expands in the gear passes through the tang to be installed on the terminal surface of connection pad, the axial positioning cover suit elastic component outside of expanding in the gear, and the elastic component that expands in the gear has interior taper hole, is equipped with the open slot in the interior taper hole section and forms the conical surface tight structure that expands with bloated core, and thin wall ring gear part dress expands in the gear on the external tooth of elastic component and leans on tightly with the terminal surface of axial positioning cover, tension rod's butt and lathe pull rod are connected and are locked with the pull rod round nut, and the thin end at tension rod is adorned to the core that expands, belleville spring, t