In an outboard motor, a damper includes a bushing fixed to a periphery of a propeller shaft. The damper includes a second pressing surface that presses a first pressing surface of an inner surface of a cylinder in a circumferential direction, an elastic member disposed around a portion of the bushing different from the second pressing surface of the bushing, and a reinforcer disposed between the first pressing surface and the second pressing surface.

A monitor and alarm system is provided for a marine vessel having a rotatable propeller drive shaft supported by one or more water-cooled bearings contained in strut barrels mounted on struts extending from the vessel hull or in stern tube assemblies. A heat sensor on the hull senses the ambient temperature of the water surrounding the vessel and one or more sensors on one or more bearings sense the temperature of the bearings. The sensed temperatures are electrically communicated via wires or wirelessly to gauges for monitoring and to a processing unit. The processing unit compares the sensed temperatures and generates a signal to an alarm device to initiate a bearing overheat warning or alarm if the differential between the bearing temperature and the ambient water temperature exceeds a predetermined amount.

A method and a device for protecting an electric motor in a pod unit for propulsion of marine vessels against shaft bending shocks when the blades of the pod propeller hit ice blocks or other hard objects, said motor having a drive shaft, a rotor and a stator, said shocks tending to momentarily bend the drive shaft (3) to such an extent that the rotor (41) will come into contact with the stator. The rotor is prevented from coming in detrimental contact with the stator by providing at least two members, which together form a radial plain bearing having mating arcuate bearing surfaces, which during normal operation of the motor are spaced from one another by a gap and come in contact with one another only at extreme loads with short durations.

The present disclosure relates to a guiding arrangement for a retractable thruster assembly. The guiding arrangement may comprise a foundation plate, a first upper guide, a second upper guide, a first lower guide, and a second lower guide. The first lower guide and the second upper guide may be arranged such that an arc angle within the range from 25 to 75 is confined therebetween. Thus, flexibility regarding the implementation of the retractable thruster assembly as L-drive or Z-drive may be gained.

A marine drive for propelling a marine vessel includes a lower gearcase, a propeller shaft laterally extending through the lower gearcase and configured to support a propeller, a propeller shaft bearing hub supporting the propeller shaft in the lower gearcase, and an exhaust passage that conveys exhaust gas through the lower gearcase to an underwater discharge outlet. The exhaust passage includes a first leg that conveys the exhaust gas downwardly in the lower gearcase and a second leg that redirects the exhaust gas laterally from the first leg to the underwater discharge outlet. The propeller shaft bearing hub comprises curved vanes that laterally redirects the exhaust gas from the first leg towards the underwater discharge outlet.

A drive device for driving a watercraft is provided. The drive device has a stator and has a rotor which, during operation, rotates relative to the stator about an axis of rotation. The axis of rotation is fixed in position in relation to the stator. The rotor is realized as an internal rotor. The rotor, at least during operation, is supported on the stator in the axial direction by means of a first axial bearing means.

This propulsion unit for an aquatic vehicle consists of a mobile casing mounted in a pivot connection in relation to a hull element of the aquatic vehicle, a drive shaft of a propeller, said shaft being mounted rotatably within the mobile casing by means of at least one bearing consisting of a closed space adapted to be filled with a hydraulic fluid, an electrical machine being adapted to drive the rotary drive shaft in relation to the mobile casing, where the propulsion unit further consists of a module for conditioning the hydraulic fluid contained in the closed space of the bearing. The propulsion unit also consists of a control device to control the conditioning, the control device consisting of a temperature sensor and capable of activating the conditioning of the hydraulic fluid contained in the closed space according to the temperature measured by the temperature sensor.

A marine propulsion system for shallow waters, swamps, savannahs and the like includes a rotating propeller shaft supporting a propeller. An anti-cavitation body defines a partial cylinder having a longitudinal axis adjacent to the propeller. The propeller generates a vacuum between the anti-cavitation body and a surface of a water body. First and second wings adjacent to edges of the anti-cavitation body are generally planar and operatively angled towards the bottom of a water body. The first and second wings are adjusted to run below the water body surface and seal the anti-cavitation body to maintain generated vacuum. A first thread is cut in a first helical direction at an end of the rotating propeller shaft adjacent the propeller, and slightly more distal therefrom a second thread is cut in a second helical direction opposed to the first thread helical direction. The second thread drives matter away from the bearing.

A vessel propulsion apparatus includes a cylindrical duct including a stator and a propeller. The propeller includes a rim including a rotor disposed at a position facing the stator and defining an electric motor in combination with the stator, and blades on an inner side in a radial direction of the rim. A fluid bearing is provided on the duct and defines a gap into which surrounding water is introduced between the fluid bearing and the rim, and is water-lubricated with respect to the rim due to water introduced into the gap from the surroundings. The vessel propulsion apparatus further includes a motor controller that drives the electric motor by rotation speed control in a rotation speed control region in which an output command is not more than a predetermined value, and drives the electric motor by torque control in a torque control region in which an output command is more than the predetermined value.

The present invention relates to a drive arrangement (10) for driving and steering a boat (1), comprising an electric drive motor (14) having a shaft (14a) and receiving element (12), receivable in or on a hull (3) of the boat (1), for receiving the shaft (14a), wherein the shaft (14a) is pivotably or rotatably mounted in the receiving element (12) in a position of the receiving element (12) to be arranged outside the boat hull (3).