Torsionally twisting propeller drive sleeve

Fluid reaction surfaces (i.e. – impellers) – Specific working member mount – Turbo machine

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Details

416 93A, 416134R, 464 89, 464180, F01D 530

Patent

active

053224167

ABSTRACT:
In a marine drive (10), a drive sleeve (50) between the propeller shaft (22) and the propeller hub (34) absorbs shock after the propeller (12) strikes an object by torsionally twisting between a forward end keyed to the propeller hub and a rearward end keyed to the propeller shaft. The drive sleeve is composed of a plastic material providing torsional twisting angular rotation at a first spring rate less than 100 lb. ft. per degree from 0.degree. to 5.degree. rotation, a second higher spring rate beyond 5.degree. rotation, and supporting over 1,000 lb. ft. torque before failure.

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