A cooling device for a ship propulsion machine includes a drain passage and a collector. The collector includes a collector main body, a case, an upper connection pipe, and a lower connection pipe having flexibility. A first bent portion is provided between an upper end portion and a lower end portion of the lower connection pipe. A second bent portion is provided between the first bent portion and the lower end portion of the lower connection pipe. The lower connection pipe extends downward from the upper end portion thereof along an axis of the case, bends at the first bent portion, extends downward while being inclined with respect to the axis so as to be separated from the axis, bends at the second bent portion, and extends downward while being inclined with respect to the axis so as to be close to the axis.

A cooling device includes a drain passage, a collection passage and a bypass passage each connecting an upstream portion and a downstream portion of the drain passage, a branched portion branched into the collection passage and the bypass passage, and a confluence portion joined the collection passage and the bypass passage. A difference between flowing directions from the upstream portion into the branched portion and from the branched portion into the collection passage is smaller than a difference between flowing directions from the upstream portion into the branched portion and from the branched portion into the bypass passage. A difference between flowing directions from the bypass passage into the confluence portion and from the confluence portion into the downstream portion is smaller than a difference between flowing directions from the collection passage into the confluence portion and from the confluence portion into the downstream portion.

An outboard motor includes a steering mechanism including a pinion located in a central portion of an outboard motor body in a right-left direction and operable to rotate together with the outboard motor body, and a rack operable to linearly move to rotate the pinion, and extending along a forward-rearward direction of the outboard motor body.

A marine propulsion device includes an engine, an exhaust pipe to allow exhaust gas of the engine to pass through the exhaust pipe, and a cooling water supply passage to supply cooling water for the engine into the exhaust pipe toward a downstream side in a flow direction of the exhaust gas and cause the cooling water to flow circumferentially along an inner peripheral surface of the exhaust pipe.

There is provided a ship propulsion machine that gives a propulsive force to a ship, including: a power source; a propulsion device that converts power of the power source into a propulsive force of the ship; a power transmission mechanism that transmits power of the power source to the propulsion device; a casing that covers the power source and the power transmission mechanism; and a fine dust capturing device. The fine dust capturing device includes: a water intake which is provided in the casing and through which water around the ship propulsion machine is to be taken in, a capturer that captures fine dust contained in water taken in from the water intake, and a water outlet through which water in which the fine dust was captured by the capturer is to be discharged.

A marine propulsion device is provided. The device includes an engine, a driveshaft that is caused to rotate by the engine, a cowling system, a gearcase that supports a propulsor for imparting a propulsive force in a body of water, and a cooling water circuit that conveys cooling water that exchanges heat with the engine. The cooling water circuit includes an engine dump hose that extends from a first end to a second end. The first end is coupled to a cooling water outlet of the engine. The cooling water circuit further includes an egress component configured to discharge the cooling water from the device at a discharge angle relative to a vertical axis. The egress component extends through one or more components of the cowling system and is coupled to the second end of the engine dump hose.

A marine propulsion device is provided. The device includes an engine, a driveshaft that is caused to rotate by the engine, a cowling system, a gearcase that supports a propulsor for imparting a propulsive force in a body of water, and a cooling water circuit that conveys cooling water that exchanges heat with the engine. The cooling water circuit includes an engine dump hose that extends from a first end to a second end. The first end is coupled to a cooling water outlet of the engine. The cooling water circuit further includes an egress component configured to discharge the cooling water from the device along a discharge trajectory parallel to a plane that bisects the device into a port side and a starboard side. The egress component extends through one or more components of the cowling system and is coupled to the second end of the engine dump hose.

The cooling device for a power source for a ship propulsion device that pumps up cooling water, from which foreign matters with sizes that cause clogging of a cooling water route have been removed, supplies the cooling water to a cooling water passage (30), and discharges the cooling water to outside after cooling a power source (10) includes: a cartridge-type filtration device (40, 73) that is provided at a midpoint of a first water passage (36, 71) in the cooling water route and incorporates a filter (45, 46) for filtrating foreign matters remaining in the cooling water; and a second water passage (38, 72) that is branched from the first water passage and adapted such that a valve member (53) is opened to cause the cooling water to flow in a case in which clogging occurs in the filter.

The present application relates to the field of marine outboard cooling technology, and more particularly to a steam-powered outboard conformal cooling system. The steam-powered outboard conformal cooling system includes a steam turbine, a cooler and a conformal heat exchanger. The conformal heat exchanger includes a casing, a lower cap, an upper cap and multiple heat exchange tubes. The casing includes an outer shell plate provided outside a hull plate, the outer shell plate and the hull plate define a seawater heat exchange chamber. A first end of each of the heat exchange tubes is communicated with a cooling water intake chamber, a second end of the each of the heat exchange tubes is communicated with a cooling water discharge chamber, the cooling water intake chamber is communicated with the cooler through a water intake pipe, the cooling water discharge chamber is communicated with the cooler through a water discharge pipe. The present application makes full use of the outboard space for making the arrangement position of the cooler on a hull more flexible, and improves the safety and reliability of the heat exchange process of the system.

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.