US Patent 7556474 Turbomachine, for example a turbojet for an airplane

A turbomachine including a wheel with hollow blades that are cooled internally by a forced flow of cooling air. According to an important characteristic of the invention, a hook-annulus (70) is interposed between the outer edge of the labyrinth-disk (52) and the rotor disk (36), the hook-annulus including a retaining shoulder (72) constituting an outer annular hook in which the outer edge of the labyrinth-disk is engaged, and a bearing shoulder (74) constituting an inner hook engaged in a groove around the circumference of the rotor disk.