Impeller driving device for cooling pump of electric outboard device

An impeller driving device for a cooling pump of an electric outboard device, the impeller driving device comprising:

• a gearbox housing mounted to a body of the outboard device;
• an impeller housing mounted to the body against a wall of the gearbox housing, the impeller housing including a lower portion defining an inlet, and an upper portion defining an outlet;
• a propeller shaft of a propeller driving motor extending vertically through a central portion of the body and the gearbox housing;
• an impeller shaft of the cooling pump extending horizontally through the wall of the gearbox housing and into the impeller housing;
• a gear assembly arranged in the gearbox housing, the gear assembly including:
• a first bevel gear mounted to an upper portion of the propeller shaft via a first one-way bearing such that the first bevel gear is rotationally coupled to the propeller shaft when the propeller shaft rotates in a first direction, and the first bevel gear is rotationally decoupled from the propeller shaft when the propeller shaft rotates in a second direction,
• a second bevel gear mounted to a lower portion of the propeller shaft via a second one-way bearing such that the second bevel gear is rotationally decoupled from the propeller shaft when the propeller shaft rotates in the first direction, and the second bevel gear is rotationally coupled to the propeller shaft when the propeller shaft rotates in the second direction, and
• a third bevel gear mounted to a first end of the impeller shaft such that the third bevel gear meshes with the first bevel gear and the second bevel gear so as to transmit a rotating force of the propeller shaft to the impeller shaft;
• and
• an impeller blade mounted to a second end of the impeller shaft within the impeller housing, the impeller blade configured to suck cooling water through the inlet and discharge the cooling water through the outlet when the rotating force is transmitted to the impeller shaft thereby directly cooling the propeller driving motor,
• wherein the gear assembly is configured to rotate the impeller shaft in only one direction when the propeller shaft rotates in the first direction and when the propeller shaft rotates in the second direction.