Abstract: An outboard motor includes an electric motor including an output shaft extending along an up-down direction; a gearing located in a gear case and including a first gear including a first gear shaft extending along the up-down direction and connected to the output shaft of the electric motor, and a second gear including a second gear shaft extending along the up-down direction and meshing with the first gear; and a housing chamber to accommodate the gearing and oil. The gearing is located higher than a lower case of the outboard motor, and the gear case includes a refrigerant flow path through which a refrigerant can flow.

Abstract: An outboard motor includes an electric motor, a motor control board to control the electric motor and having one end higher than another end, a case between the electric motor and the motor control board and including a cooling chamber, a supply flow path connected to the cooling chamber of the case to supply refrigerant to the cooling chamber, and a discharge flow path connected to the cooling chamber to discharge the refrigerant from the cooling chamber. A discharge port of the discharge flow path is located at the one end of the motor control board, a supply port of the supply flow path is located at the another end of the motor control board, a lower end of the discharge port is higher than a lower end of the supply port, and a first wall surface of the cooling chamber extends along the motor control board.

Abstract: A propulsion device for a marine vessel includes a driving source including at least one electric motor, a propeller including blades with changeable pitches and rotatable around a central axis of a propeller shaft together with the propeller shaft, a propeller shaft rotation driver to transmit a driving force from the driving source to the propeller shaft and rotate the propeller shaft around the central axis, and a pitch change driver to transmit the driving force from the driving source to the blades and change pitches of the blades. The propeller shaft rotation driver includes a first shaft, and the pitch change driver includes a second shaft closer to a bow side of the marine vessel than the first shaft.

Abstract: An outboard motor includes a drive source, a drive shaft, a steering shaft, a case, and an angle detection sensor. The drive shaft extends in an upper-lower direction and is rotatable by the driving force of the drive source. The hollow tubular steering shaft surrounds an outer circumference of the drive shaft. The case is located lower than the drive source, and an oil chamber is structured to store oil, and at least a portion of the steering shaft is housed in the oil chamber. The angle detection sensor is located higher than the oil chamber to detect the rotation angle of the steering shaft.

Abstract: An outboard motor includes a drive source, a motor controller, a coolant tube, a pump, and an air vent. The drive source includes an electric motor. The motor controller is higher than the electric motor and controls the electric motor. The coolant tube includes at least a portion of a coolant flow path through which the coolant that cools the electric motor and the motor controller circulates. The pump is connected to the coolant tube to pump the coolant. The air vent is located at an uppermost portion of the coolant flow path. The coolant pumped by the pump through the coolant flow path flows in an order of the motor controller, the air vent, and the electric motor.

Abstract: An outboard motor includes a drive source including an electric motor, a coolant tube through which a coolant to cool the drive source flows, a water tube through which water from outside the outboard motor flows, and a heat exchanger including a coolant flow path through which the coolant from the coolant tube flows and a water flow path through which the water from the water tube flows. At least one of the coolant flow path and the water flow path includes a first flow path, a second flow path lower than the first flow path, and a first bent connector connecting one end of the first flow path and one end of the second flow path. The first flow path includes a first connecting hole connected to an outside of the heat exchanger, and an upper surface inclined upward at an angle toward the first connecting hole.

Abstract: An outboard motor includes an electric motor including an output shaft extending along an up-down direction; a gearing located in a gear case and including a first gear including a first gear shaft extending along the up-down direction and connected to the output shaft of the electric motor, and a second gear including a second gear shaft extending along the up-down direction and meshing with the first gear; and a housing chamber to accommodate the gearing and oil. The gearing is located higher than a lower case of the outboard motor, and the gear case includes a refrigerant flow path through which a refrigerant can flow.

Abstract: An outboard motor includes an electric motor including an output shaft extending in an upper-lower direction, a gearing connected to the output shaft of the electric motor and including gears to rotate around a rotation shafts extending in the upper-lower direction, and a housing chamber to accommodate the gearing and oil. The housing chamber includes a peripheral wall extending around one of the gears. The peripheral wall includes a sloped portion between the one gear and the peripheral wall that is inclined upward along a rotating direction of the gear.

Abstract: An outboard motor includes an electric motor including an output shaft extending in an upper-lower direction, a first helical gear including a first gear shaft extending in the upper-lower direction and including a first end connected to the output shaft of the electric motor, a first bearing to support the first end of the first gear shaft, a second bearing to support a second end of the first gear shaft, a second helical gear including a second gear shaft extending in the upper-lower direction and meshing with the first helical gear, and a case accommodating at least the first helical gear, the first bearing, and the second bearing. At least one of the first bearing or the second bearing defines a fixing mechanism to fix the first gear shaft at a predetermined position in the upper-lower direction with respect to the case when the first and second helical gears rotate.

Abstract: An outboard motor includes an electric motor, a motor control board to control the electric motor and having one end higher than another end, a case between the electric motor and the motor control board and including a cooling chamber, a supply flow path connected to the cooling chamber of the case to supply refrigerant to the cooling chamber, and a discharge flow path connected to the cooling chamber to discharge the refrigerant from the cooling chamber. A discharge port of the discharge flow path is located at the one end of the motor control board, a supply port of the supply flow path is located at the another end of the motor control board, a lower end of the discharge port is higher than a lower end of the supply port, and a first wall surface of the cooling chamber extends along the motor control board.

Abstract: A propulsion device for a marine vessel includes a driving source including at least one electric motor, a propeller including blades with changeable pitches and rotatable around a central axis of a propeller shaft together with the propeller shaft, a propeller shaft rotation driver to transmit a driving force from the driving source to the propeller shaft and rotate the propeller shaft around the central axis, and a pitch change driver to transmit the driving force from the driving source to the blades and change pitches of the blades. The propeller shaft rotation driver includes a first shaft, and the pitch change driver includes a second shaft closer to a bow side of the marine vessel than the first shaft.