Abstract: A turbo-engine having a structure for controlling the radial gap and including an inner casing which surrounds a rotor and is assembled from shell-like parts; parts of this casing have a high thermal mass, are arranged around the rotor blades of the rotor and can be fastened in longitudinal direction (axial direction) to other parts.

Abstract: A rotor wheel including a hub in the form of a thin-walled shell. Rotor blades are arranged in an annular pattern around the axis of the hub, each blade having at least one blade root formed with a hole. A pin extends through the hole in each blade root, and at least one retaining ring coaxial with the hub axis surrounds all the pins and absorbs radial forces produced by the blades on the pins when the rotor wheel rotates. The retaining rings and blades are fixed against axial and circumferential movement with respect to the hub. A segment between each pin and retaining ring distributes the forces of the pin to the retaining ring. The pins are mounted for radial movement with respect to the hub, and one of the mounting parts for said pins may be detachable from the hub. The hub may be dish shaped, and the pins secured at only one end to the peripheral wall of the hub, that wall having axial slots so that it may expand radially.

Abstract: A rotor including a circumferential groove in which blade roots are retained. A locking means between two of the blades includes a part in the groove engaging the groove walls, and a retaining element movable radially of the rotor disk as well as rotatable about an axis lying along a radius of the disk. Tabs projecting radially outwardly from the retaining element are accommodated by a slot between the platforms of two rotor blades, when the retaining element is in one angular position. When the retaining element is rotated to another angular position, the tabs are held beneath the platforms of the two adjacent blades, and the inner end of the retaining element enters a recess in the bottom of the circumferential groove. Retaining slots may be provided in the bottom surfaces of the platforms for accommodating the tabs, and a spring may be provided to urge the retaining element radially outwardly.