| 摘要 |
In a dynamically balanced turbine wheel wherein a plurality of turbine blades are secured to a turbine disc by conventional fir tree mounting arrangements, a retaining assembly is provided to positively restrain movement of the turbine blades in an axial direction forward or aft of the wheel. A tang is machined in the leading edge of the root of each blade and bears against the forward face of the disc to prevent axial movement of the blade in the aft direction. To restrain each blade from axial movement in the forward axial direction, a radial groove is machined into the aft side of the disc and the trailing edge of the root of each blade for accommodating a wire-type retainer which is held in place by a generally cylindrical plate. The latter is piloted on the disc and secured by means of a split retainer ring which is accommodated in opposed continuous slots provided in the plate and the disc. The split retainer ring includes enlarged projections which are accommodated in enlarged portions of the opposed continuous slots, with the projections being symmetrically arranged about the periphery of the split retainer ring. The resulting assembly is dynamically balanced, and prevents relative rotation between the plate and the disc, while preventing axial movement of the blades in the cooperating channels provided in the periphery of the turbine disc.
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