Variable pitch marine propeller with shift biasing and synchroni

Details Variable pitch marine propeller with shift biasing and synchroni Variable pitch marine propeller with shift biasing and synchroni

1991-12-02

1994-03-01

Denion, Thomas E.

Fluid reaction surfaces (i.e., impellers)

With control means responsive to non-cyclic condition...

Plural distinct impellers having related control

416 44, 416137, 416139, B63H 300

Patent

active

052901475

ABSTRACT:
A marine propeller includes a hub rotatable about a longitudinal axis and having a plurality of blades extending radially outwardly therefrom and pivotable about respective radial pivot axes between a low pitch position and a high pitch position. A disc has a plurality of guide slots each receiving and retaining a respective lever arm extending rearwardly within the hub from a respective blade. A biasing spring coaxial with the longitudinal axis of rotation of the hub biases the disc to in turn bias the lever arms and blades to the low pitch position. The disc is a generally flat planar plate-like member extending radially outwardly from the longitudinal axis at the rear of the hub and includes a preload mechanism accessible at the rear of the hub for adjusting the bias. The disc restricts movement of the lever arms along the guide slots such that the lever arms can move only in unison, which prevents blade flutter. Pivoting of the blades is controlled by both a) movement of the lever arms along the guide slots, and b) arcuate movement of the guide slots as the disc rotates about the longitudinal axis, such that pivoting of each blade from its low pitch position to its high pitch position requires both a) movement of the respective lever arm along its respective guide slot, and b) rotation of the disc to arcuately move the guide slot.

REFERENCES:
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patent: 5022820 (1991-06-01), Bergeron
"Everything You Need To Know About Propellers", Third Edition, Mercury Marine Division of Brunswick Corp., Catalog QS5-384-10M, Part. No. 90-86144, p. 6, and FIG. 8, p. 7.
"Handbook of Airfoil Sections For Light Aircraft", M. S. Rice, Aviation Publications, P.O. Box 123, Milwaukee, Wisc. 53201, 1971, p. 69.

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