Improvements in or relating to an outboard propulsion system

Abstract

An outboard propulsion system for attachment to a boat, the outboard propulsion system comprising: a first portion comprising an engine; and a second portion attached to the first portion and comprising a propeller shaft that is operably connected to the engine, wherein the first portion is covered, at least partially, by a plurality of removable panels, wherein at least one removable panel is a service hatch that is moveable between a closed position configured to prevent access to the first portion and an open position configured to provide access to the first portion, wherein the service hatch is located such that, in use, and in its open position, the service hatch provides access to the first portion from within the boat, and wherein each removable panel is predominantly planar.

Description

[0001] IMPROVEMENTS IN OR RELATING TO AN OUTBOARD PROPULSION SYSTEM

[0002] FIELD OF THE INVENTION

[0003] The present invention relates to improvements in or relating to an outboard propulsion system and, more specifically, to an outboard propulsion system having an improved packaging and / or layout.

[0004] BACKGROUND TO THE INVENTION

[0005] Outboard propulsion systems comprise a first portion having an engine and a second portion comprising a propeller shaft that is operably connected to the engine. The first portion is normally covered by a removable cowl in the form of a monolithic cover. Removal of the cowl to access and / or service components of the first portion is typically burdensome and not easily achievable by users of the outboard propulsion system. Moreover, removal of the cowl when the outboard propulsion system is in use exposes the entire first portion to the external environment, which can lead to unnecessary water ingress to the system. This is particularly problematic when the boat is situated in turbulent and / or salty water, such as the sea. The removed cowl, which is usually bulky, also needs to be temporarily stored, which is undesirable given that boats typically comprise limit free space.

[0006] It is against this background that the present invention has arisen.

[0007] SUMMARY OF THE INVENTION

[0008] According to the present invention there is provided an outboard propulsion system for attachment to a boat, the outboard propulsion system comprising: a first portion comprising an engine; and a second portion attached to the first portion and comprising a propeller shaft that is operably connected to the engine.

[0009] The first portion may be covered, at least partially, by a plurality of removable panels. At least one removable panel may be a service hatch that is moveable between a closed position configured to prevent access to the first portion and an open position configured to provide access to the first portion. The service hatch may be located such that, in use, and in its open position, the service hatch provides access to the first portion from within the boat.

[0010] Each removable panel may be predominantly planar. Alternatively, or in addition, each removable panel may be substantially planar. In other words, each removable panel may be substantially flat. One or more panel may comprise contouring, such as aesthetic, strengthening, and / or aerodynamic detailing. One or more panel may also comprise a curved edge or corner. The predominantly and / or substantially planar (or flat) shape of the panel means that the smallest possible cuboidal volume that could entirely contain the panel has a much larger X and Y dimension than it does a Z dimension. For example, each of the X and Y dimensions may be at least 5 times bigger than the Z dimensions. More specifically, each of the X and Y dimensions may be at least 10 times bigger than the Z dimensions. Most specifically, each of the X and Y dimensions may be at least 15 times bigger than the Z dimensions.

[0011] The service hatch may be located, at least partially, on the front of the outboard propulsion system. In this context, the front of the outboard propulsion system is the side positioned closest to the stern of the boat when the outboard propulsion system is mounted on the boat.

[0012] The first portion may be a powerhead. The second portion may be a lower unit (or lower gearcase). The second portion may be configured to rotate with respect to the first portion. More specifically, the second portion may be configured to rotate with respect to the first portion about a steering axis. The steering axis may intersect a longitudinal axis of the propeller shaft at an obtuse angle. The obtuse angle may be between and including 90 - 170 degrees or, more preferably, between and including 100 - 160 degrees or, most preferably, between and including 110 - 140 degrees.

[0013] The service hatch may be connected to at least one other removable panel via at least one hinge. As such, in some embodiments, the service hatch may be connected to a removable panel via a hinge. Alternatively, the service hatch may be connected to a removable panel via a plurality of hinges and / or the service hatch may be connected to a plurality of removable panels via a hinge. The service hatch may further comprise a latch. The latch may be movable between a closed position configured to secure the service hatch in its closed position, and an open position configured to allow the service hatch, or at least a portion thereof, to rotate about at least one of the aforementioned hinges.

[0014] The first portion may comprise a turbocharger; and an air filter, wherein the air filter is connected to the turbocharger via a non-linear pipe configured to convey an airflow from the air filter to the turbocharger. The air filter may be accessible via the service hatch from within the boat.

[0015] The non-linear pipe may be configured to provide separation between the air filter and the turbocharger. For example, the air filter and the turbocharger may be at least 100 mm apart or, more preferably, at least 200 mm apart or, most preferably, at least 250 mm apart. More specifically, the airflow outlet of the air filter may be at least 50 mm apart or, more preferably, at least 100 mm apart or, most preferably, at least 250 mm apart from the airflow inlet of the turbocharger. The airflow inlet of the turbocharger may be configured to provide the airflow directly to a compressor. Providing a non-linear pipe between the air filter and turbocharger results in more compact packaging of the first portion compared to traditional outboard propulsion systems, thus enabling the air filter to be positioned such that it is accessible via the service hatch from within the boat.

[0016] The non-linear pipe may be shaped to convey a laminar airflow from the air filter to the turbocharger. Providing laminar airflow to the turbocharger controls the speed of the airflow and prevents the turbocharger compressor wheel from overspinning.

[0017] The non-linear pipe may comprise a bend having a non-circular cross-section. The bend may be located between the air filter and the turbocharger. The bend may be up to 90°, 100°, or 120°. However, in some embodiments, the bend may be up to 180°.

[0018] The non-circular cross-section may ensure laminar airflow flow is maintained within the pipe. The noncircular cross section may be bulbous. The non-circular cross section may be an elliptical cross section.

[0019] The non-linear pipe may comprise an inlet connected to the air filter. The inlet may comprise a substantially circular cross-section. The non-linear pipe may comprise an outlet connected to the turbocharger. The outlet may comprise a substantially circular cross-section. The cross-section of the pipe may gradually and / or smoothly transition between the aforementioned circular and non-circular cross-sections (and back again).

[0020] The turbocharger may comprise a compressor. The non-linear pipe may convey the air from the air filter to the compressor. The exact shape of the non-linear pipe may be optimised to maintain laminar airflow between the air filter and the turbocharger. The shape selection may be dictated or guided by computational fluid dynamic (CFD) models.

[0021] The first portion may comprise: a cooling unit for cooling gearbox oil and fuel, the cooling unit comprising: a cooling conduit having an inlet for receiving raw water and an outlet for discharging the raw water; an oil conduit for conveying oil for use within a gearbox, wherein the oil conduit is located, at least partially, within the cooling conduit; and a fuel conduit for conveying fuel for use within the engine, wherein the fuel conduit is located, at least partially, within the cooling conduit. The oil conduit located within the cooling conduit may be positioned between the inlet and the fuel conduit located within the cooling conduit. The cooling unit may be accessible via the service hatch from within the boat. In particular, the fuel conduit may convey fuel into a fuel tank. The fuel within the fuel tank may be for use within the engine. The fuel may be diesel. The fuel within the fuel conduit may be unused fuel from the engine. A cooling unit for cooling gearbox oil and fuel reduces the overall packaging size of the outboard propulsion system comparative to standard systems requiring separate fuel and gearbox cooling systems. Moreover, passing the oil conduit through the cooling conduit downstream of the fuel conduit maximises the temperature difference between the fluids to be cooled and the raw water located within the cooling conduit, thus improving the efficiency of the cooling unit. This further reduces the packaging size of the unit. For example, the cooling unit may be less 0.02m3or, more preferably, less than 0.01m3or, most preferably, less than 0.005m3. In some embodiments, the cooling unit may be less 0.015m3. Consequently, the cooling unit may be positioned such that it is accessible via the service hatch.

[0022] In use, the temperature of oil within the oil conduit located within the cooling conduit may reduce by at least 8°C or, more preferably, 10°C. In some embodiments, in use, the temperature of oil within the oil conduit within the cooling conduit may reduce by at least 12°C. Alternatively, or in addition, in use, the temperature of fuel within the fuel conduit within the cooling conduit may reduce by at least 20°C or, more preferably, 25°C. In some embodiments, in use, the temperature of fuel within the fuel conduit within the cooling conduit may reduce by at least 30°C.

[0023] The first portion may comprise a gearbox. The oil conduit may be configured to convey oil to and / or from the gearbox. For example, the oil conduit may be configured to convey oil from the gearbox, through the cooling conduit, and back to the gearbox.

[0024] Alternatively, or in addition, the engine may be in fluid communication with the fuel tank. The fuel tank may be remote from the first and second portion. The fuel conduit may convey fuel from the engine to the fuel tank. In particular, the fuel conduit may convey fuel from the engine, through the cooling conduit, and to the fuel tank. As such, the fuel conduit may be a fuel return line. The fuel in the fuel conduit may be excess fuel from the engine that does not get injected. The outboard propulsion system may further comprise a fuel feed line configured to convey fuel from the fuel tank to the engine.

[0025] In use, the cooling unit inlet may be in fluid communication with a body of water. The fluid communication may be provided by an inlet conduit. The inlet conduit may be coupled to the inlet of the cooling unit. Consequently, in use, raw water may be pumped into the cooling unit from a body of water upon which a boat is floating. This may be achieved using a raw water pump.

[0026] In use, the cooling unit outlet may be in fluid communication with the body of water. The fluid communication may be provided by an outlet conduit. The outlet conduit may be coupled to the outlet of the cooling unit. Consequently, in use, raw water may be pumped from the cooling unit to the body of water upon which a boat is floating. This may be achieved using the raw water pump.

[0027] In use, raw water may be conveyed through the cooling conduit only once before being returned to the body of water. Moreover, in some embodiments, the outlet conduit may be configured to convey raw water that has passed through the cooling conduit directly (back) to the body of water. However, in some embodiments, the outlet conduit may be configured to convey raw water that has passed through the cooling conduit (back) to the body of water via one or more other components of the outboard propulsion system.

[0028] For example, in some embodiments, the outlet conduit may provide fluid communication between the cooling unit outlet and a turbocharger air cooler. More specifically, in some embodiments, the outlet conduit may provide fluid communication between the cooling unit outlet and a glycol heat exchanger via the turbocharger air cooler. The glycol heat exchanger may be used to cool the engine. The turbocharger air cooler may be configured to receive a compressed airflow from the turbocharger and cool it down before conveying it to the engine. This may be achieved using the raw water discharged from the cooling unit. For example, thermal energy (heat) within the compressed air may be transferred into the raw water within the turbocharger air cooler. The raw water may then exit the outboard, via the second portion.

[0029] The cooling unit may further comprise a service inlet and / or a service outlet. The service inlet and / or service outlet may be in fluid communication with the cooling conduit. As such, the cooling conduit can be flushed out with clean water, whilst still being attached to the outboard. This is due to location of cooling unit with respect to the service hatch.

[0030] The oil conduit may be configured to convey oil from the gearbox directly to the cooling conduit, through the cooling conduit, and from the cooling conduit directly back to the gearbox. Consequently, in use, oil may be conveyed through the cooling unit only once before being returned to the gearbox. In other words, the oil conduit may be configured to convey oil that has passed through the cooling unit directly to the gearbox.

[0031] The fuel conduit may be configured to convey fuel from the engine directly to the cooling conduit, through the cooling conduit, and from the cooling conduit directly to the fuel tank. Consequently, in use, fuel may be conveyed through the cooling unit only once before being conveyed to the fuel tank. In other words, the fuel conduit may be configured to convey fuel that has passed through the cooling unit directly to the fuel tank. As a result, the cooling unit may be termed as a 'single-pass', 'once-pass' or '1-pass' cooler. The first portion may comprise: an oil reservoir in fluid communication with the second portion via an oil transfer pipe configured to convey oil therebetween, wherein the oil reservoir comprises a visual guide configured to indicate how much oil is located therewithin. The oil reservoir may be accessible via the service hatch from within the boat. The visual guide may be visible from within the boat through the service hatch.

[0032] Consequently, there is no need to take a boat comprising the outboard propulsions system out of the water in order to determine how much oil is located within the second portion. Instead, when oil is removed from second portion, either intentionally or unintentionally, the oil level within the reservoir reduces. The visual guide can, therefore, be used to determine the amount of oil within the system.

[0033] The oil within the oil reservoir and / or second portion may be pressurised. The oil in the second portion may provide lubrication to the gears and / or bearings located within the second portion. Alternatively, or in addition, the oil in the second portion may provide cooling to the gears and / or bearings located within the second portion.

[0034] The outboard propulsion system may further comprise an oil fill and evacuation tube configured to convey oil into and / or out of the second portion. The oil fill and evacuation tube may comprise an opening that, in use, is accessible via the service hatch from within the boat. As such, the oil fill and evacuation tube may be configured to convey oil between the opening and the second portion. This may be used to fill and / or evacuate oil within the second portion. The opening may be an inlet.

[0035] Consequently, there is no need to take a boat comprising the outboard propulsions system out of the water in order to fill and drain the oil from the second portion. Instead, oil for use in the second portion can be evacuated, via the service hatch, using negative pressure (a vacuum) generated by a commercial / off-the-shelf vacuum oil & fluid extractor.

[0036] Moreover, the oil fill and evacuation tube may be configured to receive pressurised oil. As such, once the second portion comprises a predetermined amount of oil, oil may be conveyed along the oil transfer pipe and into the oil reservoir. The predetermined amount of oil may be dictated by the location of the fluid connection between the oil transfer pipe and the second portion. For example, the connection may be located such that oil only enters the reservoir if the second portion is filled with oil.

[0037] The oil fill and evacuation tube opening may comprise a quick connector coupling. The quick connector coupling may be directly coupled to the oil fill and evacuation tube. The quick connector coupling may be permanently coupled to the oil fill and evacuation tube. Moreover, the first portion may comprise a bracket configured to receive the quick connector coupling. The bracket may be mounted to the oil reservoir.

[0038] According to the present invention, there is also provided a plurality of removable panels for covering at least part of the first portion of the outboard propulsion system. At least one removable panel may be a service hatch. The service hatch may be moveable between a closed position configured, in use, to prevent access to the first portion of the outboard propulsion system, and an open position configured, in use, to provide access to the first portion of the outboard propulsion system from within the boat.

[0039] The removable panels may provide access to components of the outboard propulsion system without needing to expose the entire first portion. Consequently, the present invention enables quick and easy access to all components located within the first portion, particularly those located at the top of and on any side of the first portion.

[0040] Moreover, being able to access the first portion of the outboard propulsion system, via the service hatch, from within the boat significantly improves the accessibility of key components of the outboard propulsion system. For example, the service hatch may be used to provide access to at least one of an: (turbocharger) air filter; fuel filter; Direct Drive system (DDS); gearbox oil fill / evacuation port; raw water pump; raw water strainer; engine oil fill; dry sump (i.e. gearbox oil reservoir) drain; engine coolant expansion tank; fuse box; On-Board Diagnostic (OBD) port; gearbox oil filter; and power distribution module.

[0041] Similarly, a removable panel may be used to access components position on a side of the outboard propulsion system without needing to expose the entire first portion. For example, a removable panel, such as a removable side panel, may be used to provide access to at least one of a: (turbocharger) air filter; second portion oil expansion tank; raw water strainer; oil dipstick; second portion oil fill and evacuation tube; engine coolant expansion tank; raw water pump; and gearbox oil filter.

[0042] The plurality of removable panels may connect to each other. More specifically, the plurality of removable panels may connect directly to each other. Each removable panel may comprise at least one fastener or connection configured to hold the panels together. Removable panels simplify the installation process as individual panels can be added to the outboard propulsion system one-by-one in order to cover the first potion. Individual panels, particularly predominantly and / or substantially planar panels, can also be stored more easily than a monolithic cover.

[0043] In some embodiments, the outboard propulsion system comprises a frame. The frame may be configured to receive one or more removable panel. For example, one or more removable panel may connect to the frame. In use, the panels may conceal the frame. As such, the frame may be an internal frame. The frame may help to locate the (external) panels. This may simplify the assembly of the individual panels, as trying to assemble panels together that are not restrained by a frame can be very difficult due to tolerances of the panels, and access / visibility of the receptacles for the fixings.

[0044] In some embodiments, the frame may be configured to receive each removable panel. Alternatively, in some embodiments, one or more removable panel may not connect to the frame. Instead, one or more removable panel may connect directly to the first portion, section portion, and / or another removable panel.

[0045] The frame may attach to the first portion of the outboard propulsion system. For example, the frame may attach to the engine. The frame may make use of the most suitable fixing locations within the first portion and provide robust and more suitable positioned fixing locations for the removable panels. As such a plurality of uniform, symmetrical and / or mirrored removable panels may be used even though the components within the first portion are non-symmetrical from one side to the other.

[0046] Alternatively, or in addition, the frame may attach to the second portion. More specifically, the frame may be configured to from a seal against the second portion. For example, the frame may comprise a seal configured to contact the second portion. The seal may prevent fluid from entering the outboard propulsion system via the connection between the first and second portion. The seal may comprise an elastic and / or polymeric material.

[0047] At least one removable panel may be a removable side panel. At least one removable panel may be attached directly to the second portion of the outboard propulsion system. Attaching the panel directly to the second portion may remove the need to attach that panel to an internal frame. The second portion may be a lower unit or a lower gearcase.

[0048] The second portion may comprise an upstand. The upstand may be a part of a casing of the second portion. Alternatively, the upstand may provide structural support to the second portion. At least one removable panel may be secured to the upstand.

[0049] At least one removable panel may be attached directly to another removable panel. At least one removable panel may comprise a fastener. The fastener may be removable. For example, the fastener may be a screw or a bolt. Alternatively, or in addition, at least one removable panel may comprise a captive fastener. In the context of this application, 'captive' means 'secured to' or 'attached to'. As such, a captive fastener cannot easily be separated from the panel, which prevents it from being dropped or lost. In some embodiments, the captive fastener is secured to the panel by a grommet. The grommet may be located on the side of the panel closest to the first portion, in use. The grommet may be made of rubber.

[0050] The fastener may be configured to attach the panel to at least one of another panel and the first or second portion of the outboard propulsion system. The fastener may be a quick-release fastener. The fastener may be a quarter turn fastener. As such, removal of the panel does not require any special tools or equipment.

[0051] The fastener may clamp the panel directly to the second portion of the outboard propulsion system. More specifically, the fastener may clamp a side panel directly to the upstand of the second portion.

[0052] In some embodiments, at least one removable panel comprises a plurality of fasteners. The fasteners may be as described above. For example, at least one removable panel may comprise 1, 2, 3, 4, 5, 6, 8, 10 or more than 10 fasteners.

[0053] In some embodiments, a plurality of the removable panels each comprise one or more fastener. For example, the service hatch may comprise one or more fastener.

[0054] The service hatch may be connected to a gas strut configured to rotate the hatch about its hinge. More specifically, the service hatch may be connected to a gas strut configured to move the hatch from a closed position to an open position by rotating it about its hinge. Moreover, when the hatch is in its open position, the gas strut may be configured to support the mass of the hatch. Consequently, the gas strut may provide resistance against the hatch when it is moving from its open position to its closed position. This may be beneficial whilst maintenance is being carried out, for example.

[0055] The service hatch may be configured to open upwards and away from the boat, in use. This may significantly reduce the complexity of the hinges and reduce cost. As such, the hinge may be configured to rotate the service hatch about an axis substantially parallel to the stern of the boat, in use. In most cases, the stern of a boat is substantially horizontal. As such, the axis of rotation of the hinge may be substantially horizontal.

[0056] In some embodiments, the service hatch may comprise a front hatch attached to at least one removable panel via a front hinge, wherein the front hinge is configured to move the front hatch from a closed position to an open position by rotating it, in use, towards the boat about an axis substantially parallel to the stern of the boat. The service hatch may also comprise a rear hatch attached to at least one removable panel via a rear hinge, wherein the rear hinge is configured to move the rear hatch from a closed position to an open position by rotating it, in use, away from the boat about an axis substantially parallel to the stern of the boat. In most cases, the stern of a boat is substantially horizontal. As such, the axis of rotation of the front and / or rear hinge may be substantially horizontal. This two-part service hatch provides a large opening that enables easy access to components located at the front and back of the first portion.

[0057] Hinges having an axis of rotation substantially parallel to the stern of the boat, in use, facilitates the rotation when at least the first portion of the outboard is positioned in a neutral position. This may always be the case when the first portion is fixed to the boat. It will also be the case when a (traditional) outboard propulsion system having a rotatable first portion is positioned such that a longitudinal axis of the propeller shaft is substantially parallel to the longitudinal axis of the boat. However, if the first portion of the outboard propulsion system is rotated about its steering axis away from the neutral position (i.e., to turn left or right), the axis of rotation of the service hatch will rotate with respect to the stern of the boat by that same amount. Again, the axis of rotation of the front and / or rear hinge may be substantially horizontal.

[0058] The front hatch and rear hatch may be secured together via a latch. The latch may be the aforementioned latch. As such, the latch may be movable between a closed position configured to secure the front and rear hatch together and in their closed positions, and an open position configured to allow the front and / or rear hatch to rotate about the front and rear hinge, respectively.

[0059] In some embodiments, at least one of the front and rear hatches may be connected to a gas strut configured to rotate the hatch about its hinge. More specifically, at least one of the front and rear hatches may be connected to a gas strut configured to move the hatch from a closed position to an open position by rotating it about its hinge. The at least one gas strut may be as previously described.

[0060] The rear hatch may be approximately 830mm x 700mm x 630mm. The front hatch may be approximately 700mm x 410mm x 300mm.

[0061] At least one of the front hatch and rear hatch may be supported between two removable panels when the hatch is in its closed position. Supporting the front and / or rear hatch between two removable panels provides rigidity to the plurality of removable panels without the need for an internal frame. This simplifies the design, minimises costs and improves accessibility to a propulsion system covered, at least partially, by the plurality of removable panels. At least one of the front hatch and rear hatch may be supported between two removable panels.

[0062] At least one removable panel may comprise an aperture configured to receive at least two of: fuel feed and return lines; battery connection wires; and helm control connection wires. Providing an aperture for receiving a plurality of elements for connection to a boat simplifies the connection process between the outboard propulsion system and a boat. In some embodiments, the aperture receives each of the fuel feed and return lines; battery connection wires; and helm control connection wires. The aperture may be an access port. The access port may be configured to receive only fuel feed and return lines; the battery connection wires; and the helm control connection wires.

[0063] The fuel feed and return lines may provide fluid communication between the fuel tank and the engine. In particular, the fuel feed line may be configured to convey fuel from the fuel tank to the engine. The fuel return line may be configured to convey fuel from the engine to the fuel tank.

[0064] The battery connection wires may be configured to provide electrical energy to a battery located within the outboard propulsion system. The electrical energy may be provided from the boat. As such, the battery connection wire may be configured to provide an electrical connection between a battery within the outboard propulsion system and the boat.

[0065] The helm control connection wires may be configured to provide an electrical connection between the boat or, more specifically, the helm of the boat, and at least one electrical component of the outboard propulsion system. The electrical component of the outboard propulsion system may be a central processing unit (CPU).

[0066] The invention will now be further and more particularly described, by way of example only, with reference to the accompanying drawings.

[0067] FIGURES

[0068] Figure 1 shows an outboard propulsion system according to some embodiments of the present invention, wherein the outboard propulsion system comprises a first portion that is covered, at least partially, by a plurality of removable panels;

[0069] Figure 2 shows an outboard propulsion system according to some embodiments of the present invention, wherein the outboard propulsion system comprises a first portion that is covered, at least partially, by a plurality of removable panels;

[0070] Figure 3 shows a plurality of removable panels and a service hatch for covering at least part an outboard propulsion system according to some embodiments of the present invention;

[0071] Figure 4 shows part of an outboard propulsion system according to some embodiments of the present invention, wherein the first portion comprises a turbocharger and an air filter that are connected via a non-linear pipe;

[0072] Figure 5 shows a cooling unit for cooling gearbox oil and fuel; and Figure 5 shows an outboard propulsion system according to some embodiments of the present invention, wherein first portion comprises an oil reservoir that is in fluid communication with the second portion via an oil transfer pipe.

[0073] DETAILED DESCRIPTION

[0074] Figure 1 shows an outboard propulsion system 1000 according to some embodiments of the present invention. The outboard propulsion system 1000 comprises a first portion 1100 housing an engine 1102. The outboard propulsion system 1000 also comprises a second portion 1200 (not shown in figure 1). The second portion 1200 is attached to the first portion 1100. The second portion 1200 comprises a propeller shaft (not shown in the accompanying drawings) that is operably connected to the engine 1102. The propeller shaft comprises a propeller. In use, the engine 1102 is configured to rotate the propeller shaft such that the propeller propels a boat comprising the outboard propulsion system 1000 through a body of water.

[0075] The first portion 1100 is covered, at least partially, by a plurality of removable panels 1300. One removable panel 1300 is a service hatch 1310. The service hatch 1310 is moveable between an open position (as shown in figure 1) and a closed position (as shown in figure 3). In use, and in its open position, the service hatch 1310 provides access to the first portion 1100. In use, and in its closed position, the service hatch 1310 prevents access to the first portion 1100. Moreover, the service hatch 1310 is located such that, in use, and in its open position, the service hatch 1310 provides access to the first portion 1100 from within a boat (not shown) to which the outboard propulsion system 1000 is attached.

[0076] The service hatch 1310 is attached to at least one removable panel 1302 via at least one hinge (not shown). The hinge is configured to move the service hatch 1310 from its closed position to its open position by rotating it, in use, upwards and away from the boat. As such, the hinge may be configured to rotate the service hatch 1310 about an axis substantially parallel to the stern of the boat, in use. In most cases, the stern of a boat is substantially horizontal. As such, the axis of rotation of the hinge may be substantially horizontal. The service hatch 1310 is supported between two removable panels 1302, such as removable side panels 1301, when the service hatch 1310 is in its closed position.

[0077] At least one of the plurality of removable panels 1300 comprises an aperture 1318. The aperture 1318 is configured to receive at least two of: fuel feed and return lines; battery connection wires; and helm control connection wires.

[0078] Figure 2 shows an outboard propulsion system 1000 according to some embodiments of the present invention. The outboard propulsion system 1000 comprises a first portion 1100 housing an engine 1102. The outboard propulsion system 1000 also comprises a second portion 1200 (not shown in figure 2). The second portion 1200 is attached to the first portion 1100. The second portion 1200 comprising a propeller shaft (not shown in the accompanying drawings) that is operably connected to the engine 1102. The propeller shaft comprises a propeller. In use, the engine 1102 is configured to rotate the propeller shaft such that the propeller propels a boat comprising the outboard propulsion system 1000 through a body of water.

[0079] The first portion 1100 is covered, at least partially, by a plurality of removable panels 1300. One removable panel 1300 is a service hatch 1310. The service hatch 1310 is moveable between an open position (as shown in figure 2) and a closed position (as shown in figure 3). In use, and in its open position, the service hatch 1310 provides access to the first portion 1100. In use, and in its closed position, the service hatch 1310 prevents access to the first portion 1100. Moreover, the service hatch

[0080] 1310 is located such that, in use, and in its open position, the service hatch 1310 provides access to the first portion 1100 from within a boat (not shown) to which the outboard propulsion system 1000 is attached.

[0081] More specifically, in the embodiment shown in figure 2, the service hatch 1310 comprises a front hatch 1311 and a rear hatch 1315. The front hatch 1311 is attached to at least one removable panel 1302 via at least one front hinge (not shown). The front hinge is configured to move the front hatch

[0082] 1311 from a closed position to an open position by rotating it, in use, towards the boat about an axis substantially parallel to the stern of the boat. The rear hatch 1315 is also attached to at least one removable panel 1302 via a rear hinge (not shown). The rear hinge is configured to move the rear hatch 1315 from a closed position to an open position by rotating it, in use, away from the boat about an axis substantially parallel to the stern of the boat. In most cases, the stern of a boat is substantially horizontal. As such, the axis of rotation of the front and / or rear hinge may be substantially horizontal. At least one of the front hatch 1311 and rear hatch 1315 is supported between two removable panels 1302, such as removable side panels 1301, when the hatch 1311, 1315 is in its closed position. Figure 2 shows the front hatch 1311 and rear hatch 1315 is their open position.

[0083] At least one of the plurality of removable panels 1300 comprises an aperture 1318. The aperture 1318 is configured to receive at least two of: fuel feed and return lines; battery connection wires; and helm control connection wires.

[0084] Figure 3 shows the port side of the plurality of removable panels 1300 for covering at least part the outboard propulsion system according to some embodiments of the present invention. The service hatch 1310 is connected to at least one removable panel 1302. At least one removable panel 1302 is a side panel 1301. The removable side panel 1301 may be configured to attach directly to the second portion 1200 of the outboard propulsion system 1000. In fact, a plurality of the removable panels 1302 may be configured to attached directly to the second portion 1200 of the outboard propulsion system 1000. At least one removable panel 1302 comprises at least one fastener 1303. Each fastener 1303 is configured to attach the panel 1302 to at least one of another panel 1301, 1302 and the first or second portion of the outboard propulsion system 1000.

[0085] Figure 4 shows part of an outboard propulsion system 1000 according to some embodiments of the present invention, wherein the first portion 1100 comprises a turbocharger 1110 and an air filter 1120 that are connected via a non-linear pipe 1130. The non-linear pipe 1130 is configured to convey an airflow from the air filter 1120 to the turbocharger 1110. In particular, the non-linear pipe 1130 is shaped to convey a laminar airflow from the air filter 1120 to the turbocharger 1110. For example, the non-linear pipe 1130 comprises a bend 1132 having a non-circular cross-section. In some embodiments, the non-circular cross-section at the bend 1132 is an elliptical cross-section.

[0086] The non-linear pipe 1130 comprises an inlet connected to the air filter 1120. The inlet may comprise a substantially circular cross-section. The non-linear pipe 1130 also comprises an outlet connected to the turbocharger 1110. The outlet comprises a substantially circular cross-section. The cross section of the bent section of the non-linear pipe 1130 is a variable ellipse. Consequently, the diameter of the bend 1132 changes along its length.

[0087] In some embodiments, the non-linear pipe 1130 is at least 200mm in length. For example, the nonlinear pipe 1130 may be approximately 250mm in length. In some embodiments, the inlet of the nonlinear pipe is at least 50mm in diameter. For example, the inlet of the non-linear pipe may be approximately 65mm in diameter. In some embodiments, the outlet of the non-linear pipe is at least 40mm in diameter. For example, the outlet of the non-linear pipe may be approximately 45mm in diameter. As such, the diameter of the outlet of the non-linear pipe is less than the diameter of the inlet of the non-linear pipe.

[0088] In some embodiments, the turbocharger 1110 is position below the air filter 1120. In other words, the turbocharger 1110 is vertically offset from the air filter 1120. The turbocharger 1110 is also horizontally offset from the air filter 1120. For example, the turbocharger 1110 may be position at least 150mm or, more preferably, at least 200 mm vertically below the air filter 1120. Moreover, in some embodiments, turbocharger 1110 may be position in at least 100mm or, more preferably, at least 125mm horizontally offset from the air filter 1120. When the outboard propulsion system 1000 is attached to a boat, the air filter 1120 is accessible, via the service hatch 1310, from within the boat.

[0089] Figure 5 shows a cooling unit 1150 for cooling gearbox oil and fuel. The cooling unit 1150 is located in the first portion 1100 of the outboard propulsion system 1000. The cooling unit 1150 comprises a cooling conduit 1151 having an inlet 1152 for receiving raw water and an outlet 1153 for discharging the raw water. The cooling unit 1150 also comprises an oil conduit 1154. The oil conduit is configured to convey oil to and from a gearbox 1160 (shown in figure 6). The oil conduit 1154 comprises an inlet 1155 for receiving oil from the gearbox and an outlet 1156 for discharging oil to a gearbox. The oil conduit 1154 is located, at least partially, within the cooling conduit 1151. The oil conduit 1154 is configured to convey oil from the gearbox directly to the cooling unit 1150, through the cooling conduit 1151, and from the cooling unit 1150 directly back to the gearbox 1160.

[0090] The cooling unit 1150 also comprises a fuel conduit 1157. The fuel conduit 1157 is configured to convey fuel from the engine 1102 to a fuel tank. The fuel conduit 1157 comprises an inlet 1158 for receiving fuel from the engine 1102 and an outlet 1159 for discharging fuel to the fuel tank. The fuel conduit 1157 is located, at least partially, within the cooling conduit 1151. The fuel conduit 1157 is configured to convey fuel from the engine 1102 directly to the cooling unit 1150, through the cooling conduit 1151, and from the cooling unit 1150 directly to the engine fuel tank.

[0091] As shown in in figure 5, the oil conduit located within the cooling conduit 1151 is positioned between the inlet 1152 and the fuel conduit located within the cooling conduit 1151. In other words, the oil conduit located within the cooling conduit 1151 is downstream of the fuel conduit located within the cooling conduit 1151.

[0092] When the outboard propulsion system 1000 is attached to a boat, the cooling unit 1150 is accessible, via the service hatch 1310, from within the boat. The fuel tank, not shown in the accompanying drawings, is located remote from the first portion 1100 and second portion 1200 of the outboard propulsion system 1000. In use, fuel is drawn from the fuel tank through a vessel side fuel filter before being conveyed into the first portion 1100. The fuel is they conveyed through a manifold comprising a fuel temperature sensor. The fuel is they conveyed through an outboard side fuel filter before being conveyed into a fuel pump via a gear pump. They fuel pump may be a high-pressure fuel pump. The gear pump may be located on the front of the (high pressure) fuel pump. The fuel is then pressurised and injected into the engine by injectors. This process leaves an excess of fuel that does not get injected. The excess fuel is drawn into the fuel conduit inlet 1158 and conveyed into the cooling unit 1150. Once the fuel has passed through the cooling unit 1150, it is then returned to the fuel tank via the outlet 1159.

[0093] Figure 6 shows an outboard propulsion system 1000 according to some embodiments of the present invention, wherein the first portion 1100 comprises an oil reservoir 1180. The oil reservoir 1180 is in fluid communication with the second portion 1200 of the outboard propulsion system 1000 via an oil transfer pipe 1182. The oil transfer pipe 1182 is configured to convey oil from second portion 1200 to the oil reservoir 1180. The outboard propulsion system 1000 also comprises an oil fill and evacuation tube 1184. The oil fill and evacuation tube 1184 is configured to convey oil into and out of the second portion 1200.

[0094] In some embodiments, as shown in figure 6, the oil fill and evacuation 1184 comprises a quick connector coupling (not shown in the accompanying drawings). The quick connector coupling may be directly and permanently coupled to the oil fill and evacuation tube 1184. Moreover, the first portion 1100 may comprises a bracket 1188 configured to receive the quick connector coupling. The bracket 1188 is mounted to the oil reservoir 1180.

[0095] When the outboard propulsion system 1000 is attached to a boat, the oil reservoir 1180 is visible, via the service hatch 1310, from within the boat. More specifically, the oil reservoir 1180 comprises a visual guide (not shown in the accompanying drawings). The visual guide is configured to indicate how much oil is located within the oil reservoir 1180. The visual guide may be visible from within the boat through the service hatch 1310.

[0096] In some embodiments, as shown in figure 6, the outboard propulsions system 1000 comprises a second oil reservoir 1181 configured to provide oil to the gearbox 1160. However, when present, the second oil reservoir 1181 is distinct from the first oil reservoir 1180. The first and second oil reservoirs 1180, 1181 are not in fluid communication.

[0097] Various further aspects and embodiments of the present invention will be apparent to those skilled in the art in view of the present disclosure, "and / or" where used herein is to be taken as specific disclosure of each of the two specified features or components with or without the other. For example, "A and / or B" is to be taken as specific disclosure of each of (i) A, (ii) B and (iii) A and B, just as if each is set out individually herein.

[0098] Unless context dictates otherwise, the descriptions and definitions of the features set out above are not limited to any particular aspect or embodiment of the invention and apply equally to all aspects and embodiments that are described. It will further be appreciated by those skilled in the art that although the invention has been described by way of example with reference to several embodiments, it is not limited to the disclosed embodiments and that alternative embodiments could be constructed without departing from the scope of the invention as defined in the appended claims.

Claims

CLAIMS1. An outboard propulsion system for attachment to a boat, the outboard propulsion system comprising: a first portion comprising an engine; and a second portion attached to the first portion and comprising a propeller shaft that is operably connected to the engine, wherein the first portion is covered, at least partially, by a plurality of removable panels, wherein at least one removable panel is a service hatch that is moveable between a closed position configured to prevent access to the first portion and an open position configured to provide access to the first portion, wherein the service hatch is located such that, in use, and in its open position, the service hatch provides access to the first portion from within the boat, and wherein each removable panel is predominantly planar.

2. The outboard propulsion system according to claim 1, wherein at least one removable panel is attached directly to the second portion of the outboard propulsion system.

3. The outboard propulsion system according to claim 1 or 2, wherein at least one removable panel is attached directly to another removable panel.

4. The outboard propulsion system according to any preceding claim, wherein at least one removable panel comprises a fastener configured to attach the panel to at least one of another panel and the first or second portion of the outboard propulsion system.

5. The outboard propulsion system according to any preceding claim, wherein the service hatch comprises:a front hatch attached to at least one of the removable panels via a front hinge, wherein the front hinge is configured to move the front hatch from a closed position to an open position by rotating it, in use, towards the boat about an axis substantially parallel to the stern of the boat, and a rear hatch attached to at least one of the removable panels via a rear hinge, wherein the rear hinge is configured to move the rear hatch from a closed position to an open position by rotating it, in use, away from the boat about an axis substantially parallel to the stern of the boat.

5. The outboard propulsion system according to any preceding claim, wherein at least one removable panel comprises an aperture configured to receive at least two of: fuel feed and return lines; battery connection wires; and helm control connection wires.

7. The outboard propulsion system according to any preceding claim, wherein the first portion comprises: a turbocharger; and an air filter, wherein the air filter is connected to the turbocharger via a non-linear pipe configured to convey an airflow from the air filter to the turbocharger, and wherein, in use, the air filter is accessible via the service hatch from within the boat.

8. The outboard propulsion system according to claim 7, wherein the non-linear pipe is shaped to convey a laminar airflow from the air filter to the turbocharger.

9. The outboard propulsion system according to claim 7 or 8, wherein the non-linear pipe comprises a bend having a non-circular cross-section.

10. The outboard propulsion system according to any preceding claim, wherein the first portion comprises: a cooling unit for cooling gearbox oil and fuel, the cooling unit comprising: a cooling conduit having an inlet for receiving raw water and an outlet for discharging the raw water; an oil conduit for conveying oil for use within a gearbox, wherein the oil conduit is located, at least partially, within the cooling conduit; and a fuel conduit for conveying fuel for use within the engine, wherein the fuel conduit is located, at least partially, within the cooling conduit, wherein the oil conduit located within the cooling conduit is positioned between the inlet and the fuel conduit located within the cooling conduit, and wherein, in use, the cooling unit is accessible via the service hatch from within the boat.

11. The outboard propulsion system according to claim 10, wherein the oil conduit is configured to convey oil from the gearbox directly to the cooling conduit, through the cooling conduit, and from the cooling conduit directly back to the gearbox.

12. The outboard propulsion system according to claim 10 or 11, wherein the fuel conduit is configured to convey fuel from the engine directly to the cooling conduit, through the cooling conduit, and from the cooling conduit directly to the fuel tank.

13. The outboard propulsion system according to any preceding claim, wherein the first portion further comprises:an oil reservoir in fluid communication with the second portion via an oil transfer pipe configured to convey oil therebetween, wherein the oil reservoir comprises a visual guide configured to indicate how much oil is located therewithin, and wherein, in use, the oil reservoir is accessible via the service hatch from within the boat.

14. The outboard propulsion system according to claim 13, wherein, in use, the visual guide is visible from within the boat through the service hatch.

15. The outboard propulsion system according to claim 13 or claim 14, further comprising an oil fill and evacuation tube configured to convey oil into and / or out of the section portion, wherein the oil fill and evacuation tube comprises an opening that, in use, is accessible via the service hatch from within the boat.

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