Marine propulsion – Screw propeller – Shafting
Patent
1987-05-29
1989-05-23
Peters, Jr., Joseph F.
Marine propulsion
Screw propeller
Shafting
403359, 403360, B63H 2304
Patent
active
048326372
ABSTRACT:
A marine engine crankshaft (2) is coupled to a driveshaft (19) for driving a propeller. The splined portion (20) of the upper end of the driveshaft is provided with means to reduce the driveshaft rigidity by providing an intermediately positioned groove or undercut (22) therein. The depth of the undercut is contemplated as being approximately the same as the channels (21) between the splines, and the axial extent or length (A-B) of the undercut is contemplated as being approximately equal to or greater than the undercut depth. In the assembled unit, the undercut is positioned at the outer terminus of the crankshaft. The result is a coupling wherein the rigidity of the driveshaft is reduced and it is free to flex more easily at the intersection of the members so that fatigue failure is substantially reduced.
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Bartz Clifford T.
Brunswick Corporation
Peters Jr. Joseph F.
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