1974-03-14
1976-04-20
Blix, Trygve M.
B63H 114
Patent
active
039510964
ABSTRACT:
An improved, belt-driven stern drive for boats of the type sometimes referred to as an "inboard-outboard" or a "through-transom" drive. The invention includes a wide, thin, highly-tensioned power drive belt disposed in a housing having an upper power input portion, a lower prop shaft hub portion, and intermediate housing fins. The housing is vertically, transversely split so as to provide quick-change access to belt and/or gears and for belt tensioning camming movement, the forward and rearward housing sections cooperating to provide wide (in the front-rear direction), laterally thin, hydrodynamically contoured intermediate housing fins having good front-rear shear strength. Lateral strength of the fins is enhanced by a cavitation plate associated with the fins so as to provide lower and upper flow tunnels between the fins for "force feeding" the prop and minimizing drag. Other novel features include a longitudinally (front-rear) staggered relationship between the hub and cavitation plate to minimize turbulence of water flowing to the prop; cavitation plate support member; electromechanical power trim and tilt mechanism; floating drive shaft housing member allowing for some engine misalignment and cooperating with the belt tensioning device in one embodiment; and a lubricating system providing a solid flow of oil to the bearings in the drive.
REFERENCES:
patent: 2518808 (1950-08-01), Nadolinski
patent: 3088430 (1963-05-01), Champney
patent: 3204598 (1965-09-01), Sharp
patent: 3403655 (1968-10-01), Warburton
patent: 3487803 (1970-01-01), Alexander, Jr.
patent: 3596753 (1971-08-01), Knapp et al.
patent: 3673023 (1972-06-01), Ross
Basinger Sherman D.
Blix Trygve M.
Gabriel Albert L.
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