Pitch retention member

Details Pitch retention member Pitch retention member

1988-10-07

1991-06-11

Kwon, John T.

Fluid reaction surfaces (i.e., impellers)

Vibration damping features

416205, 416248, F04D 2966

Patent

active

050228250

ABSTRACT:
A pitch retention member rotatably mounts a propeller or fan hereto radially outwardly from a spinner or a hub. The member attaches to the blade of a pair of tenons, each tenon having a hole passing therethrough for receiving a pin about which the blade may rotate. The pitch retention member cooperates with a motion limiter provided at the base of the blade to: damp rotational movement of the blade about the pin to minimize blade angular excursions when centrifugal loads are low; improve high speed blade stability; moderate blade vibratory motion and tune out undesirable blade resonant frequencies; and, absorb force created by impact with foreign objects. Such impact is adsorbed at a desired threshold level of bending load of a crushable material disposed within the blade retention pitch member.

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Paper No. 66--WA/GT-4, Authors: J. I. Goatham and G. T. Smailes; "Some Vibration Characteristics of Pin-Fixed Compressor Blades"--pp. 1 through 11, Contributed by the Gas Turbine Division--presented at Winter Annual Meeting, New York, N.Y., 11/27-12/1/66.

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