TURBO ENGINE ROTOR COMPRISING A BLADE-SHAFT CONNECTION MEANS, AND BLADE FOR SAID ROTOR

摘要

In a turbo engine, the rotor includes a shaft, blades, and a shaft-blade connection. The shaft blade connection can be provided as a fir tree connection, having a fir tree blade root and fir tree shaft grooves receiving the blade roots. The blade roots can include lobes, while the grooves can include undercut recesses receiving the lobes. The inclined mating bearing surfaces provided on a shaft post or on a lobe, respectively, are offset with respect to each other in the circumferential direction while partially overlapping. Each bearing surface is tangentially adjoined by a convexly curved end of bedding surface.

主权项

1. A turbo engine rotor comprising:
a shaft-blade connection means, the rotor having a circumferential direction, a radial direction, and an axial direction; a rotor shaft; and at least one blade, the shaft including at least one groove extending at least in the radial and the axial direction, the blade including a root extending at least in the axial and in the radial direction, the root being arranged in the groove, at least one undercut recess being provided at the groove and in a shaft post, and extending at least in the circumferential direction, the undercut recess being delimited at a radially outer side by a shaft load bearing wall, the blade root including at least one lobe, said lobe being arranged in the undercut recess, and said lobe being delimited on a radially outer side by a lobe load bearing wall, wherein the shaft load bearing wall includes a plain surface area being inclined, when seen along the axial direction, with respect to the radial direction at a first angle (a) and forming a shaft bearing surfaced, and the lobe load bearing wall including a plain surface area being inclined, when seen along the axial direction, with respect to the radial direction at the first angle (a) and forming a lobe bearing surface, wherein the lobe bearing surface and the shaft bearing surface are offset in the circumferential direction with respect to each other and overlap along a common circumferential extent.