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A retention system and method for the blades of a rotary machine for preventing forward or aft axial movement of the rotor blades includes a circumferential hub slot formed about a circumference of the machine hub. The rotor blades have machined therein a blade retention slot which is aligned with t

A retention system and method for the blades of a rotary machine for preventing forward or aft axial movement of the rotor blades includes a circumferential hub slot formed about a circumference of the machine hub. The rotor blades have machined therein a blade retention slot which is aligned with the circumferential hub slot when the blades are received in correspondingly shaped openings in the hub. At least one ring segment is secured in the blade retention slots and the circumferential hub slot to retain the blades from axial movement. A key assembly is used to secure the ring segments in the aligned slots via a hook portion receiving the ring segments and a threaded portion that is driven radially outwardly by a nut. A cap may be provided to provide a redundant back-up load path for the centrifugal loads on the key. Alternatively, the key assembly may be formed in the blade dovetail.

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1. A blade retention system for a rotating machine comprising:a hub having a plurality of shaped, generally axially extending openings at circumferentially spaced positions about the hub; a plurality of blades having complementary-shaped base portions received in the openings, each of the blades hav

1. A blade retention system for a rotating machine comprising:a hub having a plurality of shaped, generally axially extending openings at circumferentially spaced positions about the hub; a plurality of blades having complementary-shaped base portions received in the openings, each of the blades having a blade retention slot therein; a circumferential hub slot formed about a circumference of the hub, wherein the blade retention slots are substantially aligned with the circumferential hub slot when the blades are received in the openings; at least one ring segment secured in the blade retention slots and the circumferential hub slot; and a key securing the at least one ring segment in the blade retention slots and the circumferential hub slot, the key including a hook portion at one end thereof engageable with the at least one ring segment, the hook portion being displaced radially outwardly to secure the ring segment.