Patent ID: 6471483
Filing Date: 2002-10-29
Classification: F01D,F05D

Abstract:
A turbine disc rotatable about an axis, the turbine disc comprising: a peripheral face extending circumferentially about the axis, the peripheral face having a root slot formed therein for engaging roots of turbine blades to be held in the turbine disc, the root slot having a longitudinal extent extending circumferentially around the turbine disc, a depth extending radially of the disc, and a width defined between axially opposed side walls of the root slot, the root slot further having an undercut portion of its cross-section for accommodating the blade roots, at least one of the side walls of the root slot above the undercut portion having cut-away portions includinga) at least one arcuate bight defining a load slot for allowing entry and exit of the blade roots into the undercut portion of the root slot, and b) on circumferentially opposed sides of the load slot, a further at least one arcuate bight defining a shadow slot for reducing hoop stress concentrations in a perimeter of the turbine disc, said further at least one arcuate bight constituting the shadow slot having a radius of curvature greater than a radius of curvature of said at least one arcuate bight constituting the load slot.