Marine drive having two counter-rotating surfacing propellers an

Details Marine drive having two counter-rotating surfacing propellers an Marine drive having two counter-rotating surfacing propellers an

1992-05-27

1993-10-05

Oberleitner, Robert J.

Marine propulsion

Screw propeller

Propeller arrangement

416128, 416129, 464182, B63H 510

Patent

active

052499952

ABSTRACT:
A marine drive (10) has two counter-rotating surface operating propellers (12, 14). Inner and outer concentric counter-rotating propeller shafts (40, 42) are supported by a spool assembly (38) locked and retained against rotation and against axial movement in the lower horizontal bore (28) in the torpedo (34) of the drive housing (26) by axially spaced left and right hand threads (44 and 46). A thrust bearing assembly (98) transfers thrust from the outer propeller shaft to the inner propeller shaft during rotation of the propeller shafts in opposite axial direction and is axially located between fore and aft driven gears (76 and 78). Propeller shaft sealing and bearing structure, and propeller self-centering mounting structure is provided.

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