An outboard motor includes a drive shaft, a coupling to connect a first shaft and a second shaft of the drive shaft together, and a transmission including a dog clutch to transmit a rotation of the drive shaft to a propeller shaft. The coupling includes a first portion attached to the first shaft, a second portion attached to the second shaft, and a damper. The first portion includes first claws arranged along a rotation direction of the drive shaft. The second portion includes second claws between adjacent ones of the first claws in the rotation direction. The damper includes an elastic portion interposed between adjacent ones of the first claws and the second claws in the rotation direction.

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.

A gearcase for a marine propulsion system has an input shaft rotatable about a central axis of rotation and an output shaft coaxially arranged with the input shaft. A clutch assembly is operable between a first clutch position and a second clutch position, wherein, when the clutch assembly is in the first clutch position, the input shaft is coupled to the output shaft for rotating the output shaft in a first rotational direction. When the clutch assembly is in the second clutch position a gear assembly operably connects the input shaft to the output shaft for rotating the output shaft in an opposite second rotational direction. The gearcase can be part of a marine propulsion system, such as an outboard motor for a mud boat. A method of transferring power in a gearcase and a marine propulsion system are also disclosed.

An electric outboard motor (eOBM) is provided. Among other components, the eOBM includes a transom mount and a propulsion module. The transom mount is configured to mount the eOBM to a transom of a boat. The propulsion module is coupled to the transom mount and includes both a motor and an electronic speed control. Both the motor and the electronic speed control are thermally coupled to a casing of the propulsion module and the propulsion module is configured in operation to be submerged in water such that the ambient temperature of the water provides heat dissipation for both the motor and the electronic speed control

An outboard motor includes a power source disposed, a propeller shaft, a drive shaft, a gear mechanism, a lower case having an internal space in which gear oil is stored, a gear oil gauge configured to check a level or a state of the gear oil stored in the internal space, a gauge mounting hole provided configured to removably mount the gear oil gauge to the lower case such that one end side of the gear oil gauge is immersed in the gear oil stored in the internal space, a gauge insertion portion configured to insert the gear oil gauge into the gauge mounting hole, an oil supply and discharge passage provided in the lower case, and a pump connecting portion configured to connect a pump. The gauge insertion portion and the pump connecting portion are arranged side by side.

A marine propulsion apparatus including a first strut and a second strut, each extending from a proximal end to a distal end, wherein the proximal ends of the first and second struts are coupled to an anti-ventilation plate, a lower unit coupled to the distal ends of the first strut and the second strut, the lower unit the lower unit housing a sprocket, a shaft rotatably coupled to the sprocket, a propeller coupled to the shaft proximate the tail portion of the lower unit, the propeller configured to rotate with the shaft, a belt rotatably coupling the drive shaft to the sprocket, wherein the belt is disposed within the interior belt voids of the first and second struts; and at least one thermal circuit channel extending through a portion of the anti-ventilation plate, the at least one thermal circuit configured to channel a coolant to flow therethrough.

A method is for making a marine drive for propelling a marine vessel in water. The method includes providing a gearcase; installing a propeller shaft assembly that extends forwardly from the gearcase; coupling front and rear propellers to the propeller shaft assembly, forwardly of the gearcase, such that rotation of the propeller shaft assembly causes rotation of the front and rear propellers, respectively, which thereby propels the marine vessel in the water; and reducing deleterious effects of cavitation on the gearcase by the combination of forming the gearcase with a wide trailing end portion, in particular to maintain pressure alongside the gearcase, and configuring the front and rear propellers so that the front propeller absorbs more torque/thrust load than the rear propeller during said rotation.

The present disclosure relates to an impeller driving device for a cooling pump of an electric outboard device, configured so that a gearbox housing is installed on an outboard-device body and an impeller housing is installed against an outer surface of a right side of the gearbox housing on the outboard-device body to drive the impeller for the cooling pump of the electric outboard device.

An outboard motor includes a case having a gear chamber, a drive shaft arrangement hole, and a propeller shaft arrangement hole, a drive shaft, a propeller shaft, a drive gear, a driven gear, a gear position setting member provided in front of the driven gear in the case and configured to set a position of the driven gear in a front-rear direction, and a screw mechanism configured to move the gear position setting member in the front-rear direction when the gear position setting member is rotated about an axis of the gear position setting member. The screw mechanism includes a first screw provided in the case and a second screw provided on the gear position setting member and configured to be screwed with the first screw.

A propulsion device for a water-surface movable body includes an upper case, a propulsion motor accommodated in the upper case, a lower case supported by the upper case so as to turn around a turning axis, a propulsor supported by the lower case, a steering motor accommodated in the upper case, and a steering deceleration mechanism configured to decelerate rotation of the steering motor. The steering deceleration mechanism includes a gear shaft arranged in parallel with an output shaft of the steering motor, an output shaft gear arranged coaxially with the output shaft of the steering motor, a ring gear arranged coaxially with the turning axis, and deceleration gears interposed between the output shaft gear and the ring gear. At least one of the deceleration gears is arranged higher than the output shaft gear in a state where the turning axis extends in a vertical direction.