Patent ID: 7297036
Filing Date: 2007-11-20
Classification: B63H

Abstract:
1. A transmission for a marine propulsion device, comprising: a propeller shaft supported for rotation about a propeller shaft axis; a first gear disposed for rotation about said propeller shaft axis; a second gear disposed for rotation about said propeller shaft axis; a driveshaft supported for rotation about a driveshaft axis, said driveshaft axis being generally perpendicular to said propeller shaft axis; a drive gear attached for rotation with said driveshaft, said first and second gears being disposed in meshing relation with said drive gear for rotation in opposite directions from each other about said propeller shaft; a dog clutch attached for rotation with said propeller shaft about said propeller shaft axis and between said first and second gears, said dog clutch being movable parallel to said propeller shaft axis in a first direction toward said first gear and away from said second gear and in a second direction toward said second gear and away from said first gear; a first plurality of clutch projections extending from said dog clutch in a direction toward said first gear; and a first plurality of gear projections extending from said first gear in a direction toward said dog clutch, each of said first plurality of gear projections having a leading face and a trailing face, said leading face and said trailing face each being disposed at a rake angle which is greater than one degree.