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, 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 an upstream rotation member, a downstream rotation member provided on a downstream side of the upstream rotation member, and a manual rotation member interposed between the upstream rotation member and the downstream rotation member. The manual rotation member is configured to move between a first position to be coupled to the upstream rotation member and the downstream rotation member and a second position to be decoupled from the upstream rotation member and coupled to the downstream rotation member.

A ship propulsion machine includes a ship propulsion machine main body and a propulsion module. The ship propulsion machine main body includes a power source, a tank storing cooling liquid, a heat sink cooling the cooling liquid, a cooling liquid passage connecting the power source and the heat sink, a pump causing the cooling liquid to flow in the cooling liquid passage, a first housing part housing the heat sink. The propulsion module includes a drive shaft rotated by the power source and a propulsion device converting rotation of the drive shaft into the propulsion force. A connection mechanism separably connecting an output shaft of the power source and the drive shaft is provided on the power source and on the drive shaft. The first housing part and the propulsion device are provided with an attachment mechanism detachably attaching the propulsion module.

An outboard motor includes a power source, a drive shaft, a propeller shaft, a propeller attached to the propeller shaft, a case covering the power source, the drive shaft, and the propeller shaft, a water intake passage provided in the case, through which water is taken into the case from an outside of the outboard motor, a first pump configured to be driven by rotation of the drive shaft and to supply the water taken in from the water intake passage to the power source as cooling water, and a second pump configured to be driven by rotation of the drive shaft and to supply the water taken in from the water intake passage to the power source as the cooling water. The first pump and the second pump are arranged in a distributed manner in the outboard motor.

A marine drive has a supporting frame for coupling the marine drive to a marine vessel, a gearcase supporting a propulsor for propelling the marine vessel in water, an electric motor in the gearcase, the electric motor being configured to rotate the propulsor, an extension leg between the supporting frame and the gearcase, a tube in the extension leg, the tube extending between an upper end and a lower end which is coupled to the gearcase, an electrical connector extending through the tube and providing power to the electric motor, and a seal device providing a watertight seal between the electrical connector and the tube or an extension thereof to thereby prevent infiltration of water to the gearcase.

A gearcase assembly for a marine drive has a gearcase having a torpedo housing, a torpedo plug in the torpedo housing, the torpedo plug separating a lubricant cavity containing lubricant for the gearcase and a water cavity containing cooling water for the marine drive, and a shift actuator configured to actuate a shift clutch in the gearcase. The shift actuator retains the torpedo plug in place relative to the torpedo housing.

A propulsion apparatus includes a screw, a unit case, an anti-cavitation plate, a heat generation portion, and a cooling liquid passage. The screw is submerged in outside water and generates a propulsion force. The unit case accommodates at least a power transmission mechanism which transmits power from a drive source to the screw. The anti-cavitation plate is arranged on the unit case at a higher position than the screw, and at least part of the anti-cavitation plate is submerged in outside water. The heat generation portion is arranged at an inside or an outside of the unit case. The cooling liquid passage causes a cooling liquid to flow to the heat generation portion. Part of the cooling liquid passage is arranged within the anti-cavitation plate.

An outboard motor includes a cooling device which includes a supply passage supplying a cooling water taken into a lower unit to a cooling mechanism. A first shaft portion of the connecting mechanism has a cylindrical shape, is provided in an upper part of the lower unit, and has an axis coaxial with the axis of a drive shaft. A second shaft portion has a cylindrical shape, is provided in a lower part of an upper unit, and has an axis coaxial with the axis of the drive shaft. One shaft portion of the first and the second shaft portions is inserted into the other shaft portion to be pivotable relative to the other shaft portion. The drive shaft is inserted into the one shaft portion with a space. A part of the supply passage is formed of the space between the drive shaft and the one shaft portion.

A marine propulsion device for propelling a boat is provided The marine propulsion device includes a motor including an output shaft, a drive shaft configured to rotate upon receiving a rotation of the output shaft, a propeller shaft provided with a propeller and configured to be rotated upon receiving a rotation of the drive shaft, and a cooling device. The cooling device includes a cooling mechanism configured to cool the motor, and a water pump configured to send water outside the marine propulsion device to the cooling mechanism. An impeller of the water pump is connected via a one-way clutch to the output shaft, the drive shaft, or a rotation transmission member other than the drive shaft provided in the marine propulsion device and configured to rotate by the rotation of the output shaft.

A marine drive is for propelling a marine vessel. The marine drive has a drive assembly configured to support a propulsor for generating a thrust force in water, the drive assembly comprising a driveshaft housing and a gearcase suspended from the driveshaft housing, wherein the drive assembly is trimmable relative to the marine vessel about a trim joint, a steering actuator configured to steer the gearcase relative to the driveshaft housing, and a pump configured to pump a hydraulic fluid to and/or from the steering actuator via the trim joint.

A gearcase assembly for a marine drive has a torpedo housing having a cavity for containing lubricant, a passage configured for filling and draining of the lubricant to and from the cavity, a first bore and a second bore which connect the passage to opposite sides of the cavity, respectively, and a combination filling/draining device having a filling configuration in which inflow of the lubricant to the cavity via the first bore is restricted, a draining configuration in which outflow of the lubricant from the cavity via the first bore is comparatively less restricted, and a closed configuration in which outflow of the lubricant from the cavity via the passage is prevented.