Provided herein is a marine propulsion apparatus including a prime mover having a drive shaft, a cowling enclosing the prime mover, first and second struts affixed to the cowling, where each of the struts have a leading portion, an interior belt void, and a trailing portion. The apparatus further includes a lower unit coupled to the distal ends of the struts, a sprocket rotatably disposed within the lower unit, a shaft rotatably coupled to the sprocket, a belt rotatably coupling the drive shaft to the sprocket, such that a first portion of the belt is disposed within the interior belt void of the first strut and a second portion of the belt is disposed within the interior belt void of the second strut. The apparatus further includes a thermal circuit (having a heat transfer fluid) extending from the cowling, through each of the struts, and into the lower unit.

A drive device for a vessel includes an electric motor, driving a rotatable drive shaft; an elongate drive device housing, encapsulating the electric motor and the drive shaft; and a propeller, detachably mounted to the rotatable drive shaft. The drive device housing has an upper connection device. The upper connection device is symmetrical about a transverse axis, enabling the drive device housing to be mounted to a structure onboard the vessel in either of two longitudinal directions. The drive device and the hull of the vessel are separated from each other by using an isolation plate with a central isolation sleeve. The electric motor drives the drive shaft via an interconnected gear device encapsulated in the drive device housing or integrated as a part of the drive device housing and are arranged pivotably with respect to the tilt device housing.

An outboard motor includes a propeller shaft, a lower case, an upper case, and a splash guard. The lower case houses the propeller shaft. The upper case is located above the lower case. The splash guard includes an upper plate that projects forward from the upper case. The splash guard is separate from the upper case and is attached to the upper case.

An outboard drive assembly for a work boat is provided. In embodiments, an outboard drive assembly includes a lower outdrive assembly including: a housing extending between a first and end a second end and having a motor housed therein; a propeller mounted to the first end of the housing; first and second fins extending horizontally from opposing side portions of the motor housing; a third fin extending vertically from the housing; respective cutting blades attached to respective end portions of each of the first, second and third fins adjacent the propeller; an upper outdrive assembly including mounting brackets configure to connect the upper drive assembly to a deck of a work boat; and a drive arm assembly pivotally mounted to the lower outdrive assembly at a first end of the drive arm assembly and mounted to the upper outdrive assembly at a second end of the drive arm assembly.

An outboard motor includes an outboard-motor main-body, an anti-ventilation plate, and a foreign-matter collection apparatus. The anti-ventilation plate is provided on the outboard-motor main-body. The foreign-matter collection apparatus is provided above the anti-ventilation plate and outside the outboard-motor main-body and located at a height such that a water intake is submerged under water when a ship to which the outboard-motor main-body has been attached is in a pre-planing state.

A marine propulsion device includes an engine, a driveshaft powered by the engine, a propulsor shaft coupled in torque-transmitting relationship with the driveshaft, and a propulsor coupled to the propulsor shaft and rotatable to produce a thrust. A housing supports the propulsor shaft therein. The housing has fore and aft skegs projecting from a bottom surface thereof.

A marine propulsion device includes an engine, a driveshaft powered by the engine, a propulsor shaft coupled in torque-transmitting relationship with the driveshaft, and a propulsor coupled to the propulsor shaft and rotatable to produce a thrust. A housing supports the propulsor shaft therein. The housing has fore and aft skegs projecting from a bottom surface thereof.

There are included: a motor contained in a top cover; a vertical shaft that is rotationally driven by the motor, the vertical shaft being contained in an extension casing; and a propeller that is rotationally driven by the vertical shaft, the propeller being provided at a gear casing. A heat exchanging member is provided that is positioned below an anticavitation plate and above a propeller shaft that rotationally drives the propeller, and inside the heat exchanging member, a cooling oil channel member is provided that cooling oil for cooling the motor flows through.

There are included: a motor contained in a top cover; a vertical shaft that is rotationally driven by the motor, the vertical shaft being contained in an extension casing; and a propeller that is rotationally driven by the vertical shaft, the propeller being provided at a gear casing. A heat exchanging member is provided that is positioned below an anticavitation plate and above a propeller shaft that rotationally drives the propeller, and inside the heat exchanging member, a cooling oil channel member is provided that cooling oil for cooling the motor flows through.

An outboard motor includes a propeller shaft, a lower case, an upper case, and a splash guard. The lower case houses the propeller shaft. The upper case is located above the lower case. The splash guard includes an upper plate that projects forward from the upper case. The splash guard is separate from the upper case and is attached to the upper case.