Propeller shaft assembly for marine propulsion system

Details Propeller shaft assembly for marine propulsion system Propeller shaft assembly for marine propulsion system

1995-05-31

1996-09-24

Larson, James

Fluid reaction surfaces (i.e., impellers)

Plural impellers having relative movement or independent...

Coaxial rotation

416170R, 440 80, B63H 2000

Patent

active

055584985

ABSTRACT:
A simple structured propeller shaft assembly for a counter-rotating propeller system of a watercraft outboard drive prevents fishing line, weeds and like debris from entangling on a shaft of the propeller system and damaging the lubricant seals of the shaft assembly. The shaft assembly includes a nut which threads partially onto an end of an outer propeller shaft of the propeller shaft assembly. A thrust washer, carrier by an inner propeller shaft, includes a front hub which partially inserts into the nut adjacent to the end of the outer shaft. The nut, thrust washer and outer shaft end together define a labyrinth path into the space occupied by the lubricant seals between the inner and outer shafts. This labyrinth path inhibits weeds and like debris from wrapping around the inner shaft at a point adjacent to the lubricant seals.

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