Torsional damper for marine drive unit

Details Torsional damper for marine drive unit Torsional damper for marine drive unit

1988-09-13

1990-05-15

Peters, Jr., Joseph F.

Marine propulsion

Screw propeller

With vibration dampening

188290, 440 83, 440 75, 440900, 192 58B, B63H 2128

Patent

active

049254090

ABSTRACT:
A torsional damper for interconnecting the engine crankshaft and the driveshaft in a marine drive unit utilizes a high viscosity fluid as the fluid drive medium and also to cushion the transmission from the crankshaft to the driveshaft of torsional vibrations created by peak engine firing impulses. The damper includes two sets of interleaved and overlapping damper plates disposed within a housing. One set of plates is attached to the crankshaft input for relative rotation therewith and the other set is attached to the driveshaft and driven by the high shear resistance of the transmission fluid. The extremely high viscosity fluid reduces slip between the plate sets and thus between the crankshaft and driveshaft to a minimum, yet effectively precludes the transmission of torsional vibrations which significantly reduce drive train life. The damper construction of the present invention may be adapted for use in both outboard motors and stern drives.

REFERENCES:
patent: 3390748 (1968-07-01), Hein et al.
patent: 3907079 (1975-09-01), Chapman
patent: 4503952 (1985-03-01), Hesse
patent: 4782930 (1988-11-01), Kuroiwa et al.

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