초록 ▼

A marine propulsion system with counter-rotating propellers is provided with the capability of causing the propellers to rotate at different speeds. A first gear is attached to an inner propeller shaft and a second gear is attached to an outer propeller shaft. The inner and outer propeller shafts ar

A marine propulsion system with counter-rotating propellers is provided with the capability of causing the propellers to rotate at different speeds. A first gear is attached to an inner propeller shaft and a second gear is attached to an outer propeller shaft. The inner and outer propeller shafts are arranged in coaxial and concentric relation for rotation about an axis of rotation. A driveshaft is connected to a pinion gear which engages the teeth of the fore and aft gears at different effective diameters. The pinion gear meshes with a first plurality of gear teeth on a beveled surface of the fore gear while a second set of gear teeth of the pinion gear mesh with a second plurality of gear teeth on a beveled surface of the aft gear. Because of the different effective diameters of the first and second pluralities of gear teeth, the inner and outer shafts rotate at different speeds.

대표청구항 ▼

[ We claim:] [1.] A marine drive comprising:an inner propeller shaft;an outer propeller shaft, said inner and outer propeller shafts being disposed in coaxial and concentric relation with each other about an axis of rotation;a driveshaft;a pinion gear attached to said drive shaft;a first gear attach

[ We claim:] [1.] A marine drive comprising:an inner propeller shaft;an outer propeller shaft, said inner and outer propeller shafts being disposed in coaxial and concentric relation with each other about an axis of rotation;a driveshaft;a pinion gear attached to said drive shaft;a first gear attached to said inner propeller shaft, said pinion gear being engaged in meshing relation with a first plurality of gear teeth of said first gear to rotate said inner propeller shaft in a first rotational direction about said axis of rotation, said first plurality of gear teeth having a first effective diameter about said axis of rotation; anda second gear attached to said outer propeller shaft, said pinion gear being engaged in meshing relation with a second plurality of gear teeth of said second gear to rotate said outer propeller shaft in a second rotational direction about said axis of rotation, said second plurality of gear teeth having a second effective diameter about said axis of rotation, said first and second effective diameters having different magnitudes, whereby said inner and outer shafts rotate at different speeds about said axis of rotation.