Special outboard engine capable of underwater navigation

Abstract

The application discloses a special outboard motor capable of hidden underwater navigation, and relates to the technical field of outboard motors. The driving device and the transmission propelling device are installed at both ends of the shell body, the crankshaft of the driving device is arranged along the length direction of the shell body, the chemical heating cavity is communicated with the heat-sensitive cylinder, the magneto flywheel is installed on the top of the crankshaft, the crankshaft is in transmission connection with the transmission propelling device; the heat-sensitive piston is arranged in the heat-sensitive cylinder and is in transmission connection with the crankshaft through the heat-sensitive connecting rod; the cold-sensitive piston is arranged in the cold-sensitive cylinder and is in transmission connection with the crankshaft through the cold-sensitive connecting rod; when the heat-sensitive piston moves to the leftmost side, the heat-sensitive cylinder gas medium cavity is communicated with the cold-sensitive cylinder; the transmission propelling device comprises a driving wheel set and a propeller, the driving wheel set is in transmission connection with the crankshaft, and the driving wheel set is in transmission connection with the propeller. The above-mentioned outboard motor can navigate underwater at any time.

Description

Technical Field

[0001] This invention relates to the field of outboard motor technology, and in particular to a special outboard motor capable of stealthy underwater navigation. Background Technology

[0002] Currently, all existing outboard motors, both domestically and internationally, are powered by either fuel or battery. Fuel-powered outboard motors use internal combustion engines that run on fuels such as gasoline, diesel, kerosene, alcohol, natural gas, hydrogen, and liquefied petroleum gas. Gasoline and diesel engines are the most common power sources for fuel-powered outboard motors. Battery-powered outboard motors use electric motors powered by batteries. Batteries mainly include chemical batteries, physical batteries, and biological batteries, with lithium-ion batteries being the most common power source for battery-powered outboard motors.

[0003] Outboard motors powered by fuel or batteries can only be used for surface navigation. When the outboard motor is submerged in water along with the boat, it cannot be started or operated underwater. Furthermore, when there is a need for underwater concealment, the fuel or battery power must be waterproofed. After emerging from the water, the waterproofing must be removed before the outboard motor can be started and operated. If the fuel or battery power leaks due to the failure of the waterproofing during underwater concealment, the outboard motor will become paralyzed after emerging from the water and cannot be started or operated.

[0004] Due to the special nature of modern warfare, underwater rescue, underwater surveying and exploration missions, outboard motors are required to be able to conceal themselves underwater at any time and navigate normally underwater. Outboard motors powered by fuel or batteries cannot meet the requirements of concealment underwater at any time and normal navigation underwater due to their inherent technical characteristics.

[0005] Therefore, how to provide an outboard motor suitable for underwater navigation is a technical problem that needs to be solved. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a special outboard motor capable of stealthy underwater navigation.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A special outboard motor capable of stealthy underwater navigation is provided, characterized in that it includes a shell, a drive unit, and a transmission propulsion unit;

[0009] The drive unit and the transmission propulsion unit are respectively installed at the top and bottom of the housing. The drive unit includes a thermal cylinder, a chemical heating chamber, a cold-sensitive cylinder, a crankshaft, a magneto flywheel, and a water circulation refrigeration unit for cooling the cold-sensitive cylinder. The crankshaft is arranged along the length of the housing. The thermal cylinder and the cold-sensitive cylinder are located on the same side of the crankshaft. The chemical heating chamber is connected to the thermal cylinder. The magneto flywheel is installed at the top of the crankshaft. The crankshaft is connected to the transmission propulsion unit.

[0010] The thermal cylinder is equipped with a thermal piston, which is connected to the crankshaft via a thermal connecting rod.

[0011] The cooling cylinder is equipped with a cooling piston, which is connected to the crankshaft via a cooling connecting rod. When the thermal piston moves to the leftmost position, the gas medium chamber of the thermal cylinder is connected to the cooling cylinder.

[0012] The transmission propulsion device includes a drive wheel assembly and a propeller. The drive wheel assembly is driven by the crankshaft and the propeller. Attached Figure Description

[0013] Other and more objects and advantages will become apparent from the following description. The accompanying drawings are intended to illustrate examples of various forms of the invention. They should not be construed as showing a limitation on all the ways in which the invention can be made and adopted. Undoubtedly, various changes and substitutions can be made to various components of the invention. The invention also lies in the sub-combinations and subsystems of the described elements, and in the methods of using them.

[0014] In the attached diagram:

[0015] Figure 1 This is a schematic diagram of a special outboard motor capable of concealed underwater navigation in an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram illustrating the working principle of the thermal cylinder in an embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram illustrating the working principle of the cooling cylinder in an embodiment of the present invention.

[0018] Figure label:

[0019] 1—Power head, 11—Thermosensitive cylinder, 111—Thermosensitive cylinder gas medium chamber, 112—Heat source chamber, 113—Activator chamber, 114—Thermosensitive piston, 115—Thermosensitive connecting rod, 12—Cooling cylinder, 121—Cooling piston, 122—Cooling connecting rod, 13—Crankshaft, 14—Magnet motor flywheel, 2—Control system, 3—Suspension system, 4—Transmission and propulsion system, 41—Drive shaft, 42—Cooling water pipe, 43—Centrifugal water pump, 44—Drive bevel gear, 45—Forward bevel gear, 46—Reverse bevel gear, 47—Jaw clutch, 48—Propeller. Detailed Implementation

[0020] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0021] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0023] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] like Figures 1 to 3 As shown, the special outboard motor capable of stealthy underwater navigation provided by the present invention includes a shell, a drive unit, and a transmission propulsion unit;

[0026] The drive unit and the transmission propulsion unit are respectively installed at the top and bottom of the housing. The drive unit includes a thermal cylinder 11, a chemical heating chamber, a cold-sensitive cylinder 12, a crankshaft 13, a magneto flywheel 14, and a water circulation refrigeration unit for cooling the cold-sensitive cylinder 12. The crankshaft 13 is arranged along the length of the housing. The thermal cylinder 11 and the cold-sensitive cylinder 12 are located on the same side of the crankshaft 13. The chemical heating chamber is connected to the thermal cylinder 11. The magneto flywheel is installed on the top of the crankshaft 13. The crankshaft 13 is connected to the transmission propulsion unit.

[0027] A thermal piston 114 is installed inside the thermal cylinder 11, and the thermal piston 114 is connected to the crankshaft 13 via a thermal connecting rod 115.

[0028] A cooling piston 121 is provided inside the cooling cylinder 12. The cooling piston 121 is connected to the crankshaft 13 via the cooling connecting rod 122. When the thermal piston 114 moves to the leftmost position, the gas medium chamber of the thermal cylinder 11 is connected to the cooling cylinder 12.

[0029] The transmission propulsion device includes a drive wheel assembly and a propeller 48. The drive wheel assembly is connected to the crankshaft 13 and the propeller 48.

[0030] In practice:

[0031] Special outboard motors do not require fuel or battery power and can operate underwater to propel boats. The device includes a power unit 1, a transmission and propulsion system 4, a control mechanism 2, and a suspension system 3. The working principle is as follows: the outboard motor power unit 1 is generally a water-cooled internal combustion engine, with a centrifugal water pump 43 mounted on the drive shaft 41 providing sufficient cooling water; the crankshaft 13 is vertical, facilitating the transmission of power from the power unit 1 to the propeller 48 via bevel gears 44, 45, and 46; the heat-sensitive cylinder 11 and the cold-sensitive cylinder 12 are horizontal cylinders, with the heat-sensitive piston 114 and the cold-sensitive piston 121 moving horizontally; the magneto flywheel 14 is located on the upper end of the crankshaft 13; the shifting mechanism controls a jaw clutch 47, and the linear movement of the jaw clutch 47 enables the propeller 48 to rotate forward and backward, thus achieving forward, stop, and reverse movement of the boat.

[0032] The power head 1 serves as the drive source for the outboard motor, outputting power (torque). This output power (torque) is then transmitted to the propulsion system 4 via a transmission mechanism, enabling the outboard motor to operate. Specifically, the power head 1 is mounted on the upper part of the central mounting base, while the gearbox is mounted on the lower part. The output power (torque) from the power head 1 drives the drive shaft 41 in the propulsion system 4 via the crankshaft 13. The drive shaft 41 then drives the orthogonally meshing bevel gears 44, 45, and 46. The power is then transmitted to the propeller 48 via the linear motion of the jaw clutch 47 mounted on the propeller shaft, selecting between the forward bevel gear 45 and the reverse bevel gear 46, thus enabling the propeller 48 to rotate forward and reverse. The power head 1 is a uniquely developed engine that does not require fuel combustion for propulsion. Its main characteristic is that the engine does not require air as a medium to burn fuel for energy, and there is no exhaust gas discharge. In other words, the engine does not require gas exchange with the outside environment, allowing it to operate in an underwater space isolated from the air, thereby enabling the outboard motor to navigate underwater.

[0033] Preferably, the engine, which does not require fuel combustion for propulsion, is located at the outboard motor power head 1 and is tightly connected to the transmission propulsion system 4. The connection is sealed to prevent leakage under deep-water pressure as required by the operating conditions. Similarly, the engine compartment, transmission propulsion system 4, control mechanism, suspension system, etc., are also optimally designed to prevent leakage under deep-water pressure as required by the operating conditions. Since the outboard motor meets the leakage prevention requirements under deep-water pressure, it can be stored and operated underwater, enabling the outboard motor to achieve underwater concealment storage and underwater operation to propel the boat.

[0034] Preferably, the engine, which does not require fuel combustion to drive, is located in a sealed working chamber, which is equipped with a flameless heater, a water-cooled system, an engine, a power transmission system, and a waterproof sealing system.

[0035] The flameless heater, 1) is located at one end of the sealed working chamber and mainly consists of a heat source chamber 112 (chemical reactant) 112, an activator chamber 113 (or activator device) 113, a control device, and a heating device. The heat source chamber 112 and the activator chamber 113 are separated. The heat source chamber 112 designed in this invention uses a chemical raw material capable of generating heat energy. This chemical raw material does not produce open flames or require gas exchange during the heat energy generation process, and can achieve the generation of the required heat energy in a sealed environment within a required time through a control system. The basic working principle of the flameless heater is to bring the chemical reactant and activator into contact through the control system, thereby releasing heat energy. This heat energy is then transferred through the control system to the heating device of the engine's heat-sensitive cylinder 11, which is connected to the flameless heater within the working chamber, thus guiding the required heat energy input to the engine.

[0036] 2) The water circulation cooling system is located at the opposite end of the sealed working cabin, opposite the flameless heater. The cooling water medium is drawn from the working water area of ​​the outboard engine by the centrifugal water pump 43 located on the drive shaft 41. After being pressurized by the water pump, it is delivered to the water circulation cooling system through the cooling water pipe 42. The cooling source is transmitted to the cooling device of the engine cooling cylinder 12, which is connected to the flameless heater in the working cabin, through the control system, thus completing the guidance of the cooling source input required by the engine.

[0037] 3) The engine is located in the middle of the sealed working compartment. Its heat-sensitive cylinder 11 and cold-sensitive cylinder 12 are arranged in two rows on one side of the engine. The heating device of the heat-sensitive cylinder 11 is connected to a flameless heater, and the cooling device of the cold-sensitive cylinder 12 is connected to a water-circulating refrigeration system. The engine crankshaft 13 is connected to the power transmission system. First, a rated volume of gas medium, including hydrogen, nitrogen, helium, or air, is sealed in the gas medium chamber 111 of the heat-sensitive cylinder. During operation, the control system sends a signal to the flameless heater to generate heat energy to heat the gas in the gas medium chamber 111 of the heat-sensitive cylinder, causing the pressure inside the heat-sensitive cylinder 11 to rise, forcibly pushing the heat-sensitive piston 114 downward, completing the engine's power stroke. When piston 114 in the hot-sensitive cylinder 11 moves downward, piston 121 in the cold-sensitive cylinder 12 also moves downward. This pushes hot gas into the cold-sensitive cylinder 12, and the control system sends a signal to the water circulation cooling system to generate a cooling source, rapidly cooling the gas in the cold-sensitive cylinder 12 to the temperature of the cooling source, thereby reducing the pressure. Piston 121 in the cold-sensitive cylinder 12 continues to move downward to compress the gas, and the heat generated during compression is dissipated through the cooling source. Piston 121 in the cold-sensitive cylinder 12 moves upward, and piston 114 in the hot-sensitive cylinder 11 also moves upward simultaneously. This forces gas into the hot-sensitive cylinder 11, causing the gas to heat up rapidly, thus increasing the pressure to the point where the cycle can be repeated, and the engine begins a new cycle. The piston 114 in the thermal cylinder 11 and the piston 121 in the cold-sensitive cylinder 12 perform linear reciprocating motion in a cycle of heat absorption, expansion, cooling, and compression. Then, through the thermal connecting rod 115 and the cold connecting rod 122, the kinetic energy is transmitted to the crank of the crankshaft 13 assembly, which drives the crank to rotate around the center line of the crankshaft 13, thereby realizing the power output of the crankshaft 13.

[0038] 4) The power transmission system is located in the sealed working compartment and connects the engine output with the intermediate transmission mechanism of the outboard motor. The power energy output by the engine in the form of rotational torque is transmitted to the drive shaft 41 of the intermediate transmission mechanism through the rotatable and sealed power transmission system, thereby realizing the power output of the engine.

[0039] Working principle description of thermal cylinder 11:

[0040] like Figure 2 As shown in the embodiments of this application, the thermal cylinder 11 is used to generate a chemical reaction after two or more reactants (chemical substances) come into contact, thereby releasing heat energy (heat). Each reactant is sealed in a sealed container, and the outlet device is controlled by an electronic valve remotely controlled by microelectronics, which can precisely control the amount and time of reactant output.

[0041] Containers A and B contain conventional reactants, container C contains a reaction catalyst, and container D contains a reaction inhibitor.

[0042] When the engine needs to be started, the reactants in containers A and B enter the reaction chamber through the electronic valve and undergo a chemical reaction to generate heat. The heat is then conducted to the heat-sensitive cylinder 11 through the thermostat valve for heating.

[0043] When the engine needs to run continuously, containers A and B continuously supply reactants to the reaction chamber, thus generating a continuous source of heat energy.

[0044] When the engine needs to accelerate rapidly or increase torque, the temperature of the heat-sensitive cylinder 11 needs to be increased instantly. At this time, the catalyst in container C enters the reaction chamber through the electronic valve, which intensifies the chemical reaction between reactant A and reactant B, causing it to generate high energy instantly.

[0045] When the engine needs to decelerate or stop rapidly, the temperature of the heat-sensitive cylinder 11 needs to be reduced instantly. At this time, the inhibitor in container D enters the reaction chamber through the electronic valve to inhibit the chemical reaction between reactant A and reactant B, thereby instantly reducing the energy production.

[0046] As a practical implementation scheme, the reactants selected in this embodiment are calcium oxide and water. The chemical reaction to produce calcium hydroxide generates a large amount of heat. The catalyst is sodium carbonate. Sodium carbonate reacts further with the calcium hydroxide generated in the previous step to produce calcium carbonate and sodium hydroxide. Sodium hydroxide undergoes a vaporization reaction due to high temperature, generating even more heat (the vaporization chemical reaction produces sodium hydroxide, sodium oxide, water, and heat). The inhibitor is diatomaceous earth (SiO2·nH2O). During the heating process, diatomaceous earth can absorb some water, playing a role in "slow-release" and controlling the reaction rate.

[0047] The solenoid valve between the reaction chamber and the thermal cylinder controls the amount of heat generated by the reaction entering the thermal cylinder, similar to controlling the size and on / off state of a solenoid valve to deliver heat to the thermal cylinder as needed (different operating conditions require different amounts of heat). For example, when rapid acceleration is required, heat accumulates in the reaction chamber, and then the solenoid valve is quickly opened to send the heat into the thermal cylinder to generate sufficient power for the outboard motor. Waste generated in the reaction chamber can be discharged from the waste outlet through the air pressure generated by the piston moving to the right.

[0048] Working principle description of the cooling cylinder 12:

[0049] The cooling principle of the cold-sensitive cylinder 12 is basically the same as that of the gasoline-powered outboard motor.

[0050] The gearbox of the outboard motor is equipped with a water inlet with a filter screen at a height close to the propeller shaft 48. The internal water channel is connected to the water pump suction port at the top of the gearbox. The water pump outlet is controlled by a microelectronic remote-controlled electronic throttle valve and is connected to the water inlet of the cooling water channel of the cooling cylinder 12. The water outlet of the cooling water channel of the cooling cylinder 12 is connected to the drain port on the gearbox of the outboard motor through a pipe.

[0051] When the outboard motor is working, it drives the water pump impeller to rotate. The water pump draws water from the water area through the water inlet on the outboard motor gearbox. After being pressurized by the water pump, the water is pumped into the cooling water channel of the cooling cylinder 12. The cooling water carries away the heat in the cooling cylinder 12 water channel and is then discharged into the water area through the drain outlet.

[0052] When the outboard motor is first started, the electronic throttle valve opens to a set flow rate to ensure that the temperature of the cooling cylinder 12 is within the required operating range.

[0053] When the engine needs to accelerate rapidly or increase torque, the cooling cylinder 12 needs to cool down instantly. At this time, the electronic throttle valve increases its opening as needed, instantly increasing the flow of cooling water to achieve rapid cooling of the cooling cylinder 12.

[0054] When the engine needs to decelerate or stop rapidly, the cooling cylinder 12 does not need to cool down quickly. At this time, the electronic throttle valve reduces its opening as needed, and the coolant flow rate decreases accordingly.

[0055] In one possible implementation, the drive wheel assembly includes a drive bevel gear 44, a forward bevel gear 45, a reverse bevel gear 46, and a jaw clutch 47. The drive bevel gear 44 is fixedly connected to the crankshaft 13 and meshes orthogonally with the forward bevel gear 45 and the reverse bevel gear 46. The jaw clutch 47 is fixedly connected to the propeller shaft 48 and moves linearly along the propeller shaft 48, engaging with the forward bevel gear 45 and the reverse bevel gear 46.

[0056] The drive wheel assembly allows the propeller 48 to be driven more effectively to perform operations according to the required travel requirements, thereby controlling the movement of the outboard motor.

[0057] As one possible implementation, the shell includes an engine compartment, a transmission compartment, and a drive compartment;

[0058] The drive unit is installed in the engine compartment, and the engine compartment and drive compartment are respectively fixed to both ends of the drive compartment and sealed together; the drive is located in the transmission compartment, and its two ends extend into the engine compartment and drive compartment.

[0059] As one possible implementation, the water circulation cooling unit includes a centrifugal water pump 43, a cooling water pipe 42, and a drain pipe;

[0060] Centrifugal water pump 43 is installed inside the housing. One end of cooling water pipe 42 is connected to centrifugal water pump 43, and the other end of cooling water pipe 42 is connected to the inlet of cooling water channel of cooling cylinder 12. The outlet of cooling water channel is connected to the outside.

[0061] In one possible implementation, the chemical heating chamber includes a reaction chamber and at least two containers; the reaction chamber is connected to a thermosensitive cylinder 11, and the containers are all connected to the reaction chamber. Solenoid valves are installed in the connecting channels between the reaction chamber and the thermosensitive cylinder 11, as well as between the containers and the reaction chamber. Figure 2 In the illustrated embodiment, four containers are provided. Containers A and B can be filled with conventional reactants, container C can be filled with a reaction catalyst, and container D can be filled with a reaction inhibitor.

[0062] By setting up a storage space for reactants and corresponding catalysts and inhibitors, and by installing solenoid valves, the start, end, and extent of the reaction can be effectively controlled, thereby enabling control of the outboard motor's start, stop, and speed.

[0063] As one possible implementation, the chemical heating chamber also includes a reactant discharge port; the reactant discharge port is located at the bottom of the reaction chamber and is connected to the reaction chamber.

[0064] The included discharge outlet allows for the removal of reactants, ensuring the continuity of the reaction.

[0065] As one possible implementation, the outboard motor also includes an operating system 2 and a suspension system 3; both the operating system 2 and the suspension system 3 are fixedly connected to the housing.

[0066] Operating system 2 enables control of the outboard motor, while suspension system 3 allows for the attachment of necessary devices, thus improving the applicability of the outboard motor.

[0067] As one possible implementation, the thermal cylinder 11 and the cold cylinder 12 are filled with a fixed amount of gas.

[0068] By filling the thermal cylinder 11 and the cold-sensitive cylinder 12 with a fixed amount of gas, the gas can drive the piston to move according to heating and cooling, thus ensuring the continuity of the movement.

[0069] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0070] Of course, various changes and substitutions can be made to the above description, and all such changes and substitutions are within the spirit and scope of the invention. Therefore, the invention should not be limited except for the appended claims and their equivalents.

Claims

1. A special outboard motor capable of covert underwater navigation, characterized in that, The outboard engine comprises a shell, a driving device and a transmission propulsion device. The driving device and the transmission propulsion device are respectively installed on the top and bottom of the shell, the driving device comprises a heat-sensitive cylinder, a chemical heating cavity, a cold-sensitive cylinder, a crankshaft, a magneto flywheel and a water circulation refrigeration unit for refrigerating the cold-sensitive cylinder; the crankshaft is arranged along the length direction of the shell, the heat-sensitive cylinder and the cold-sensitive cylinder are located on the same side of the crankshaft, the chemical heating cavity is communicated with the heat-sensitive cylinder, the magneto flywheel is installed on the top of the crankshaft, and the crankshaft is in transmission connection with the transmission propulsion device. A heat-sensitive piston is arranged in the heat-sensitive cylinder, and the heat-sensitive piston is in transmission connection with the crankshaft through a heat-sensitive connecting rod. A cold-sensitive piston is arranged in the cold-sensitive cylinder, and the cold-sensitive piston is in transmission connection with the crankshaft through a cold-sensitive connecting rod; when the heat-sensitive piston moves to the leftmost side, the heat-sensitive cylinder gas medium cavity is communicated with the cold-sensitive cylinder. The transmission propulsion device comprises a driving wheel set and a propeller, the driving wheel set is in transmission connection with the crankshaft, and the driving wheel set is in transmission connection with the propeller.

2. The special outboard motor capable of stealthy underwater navigation according to claim 1, characterized in that The driving wheel set comprises a driving bevel gear, a forward gear bevel gear, a reverse gear bevel gear and a jaw clutch. The driving bevel gear is fixedly connected with the crankshaft and is in orthogonal engagement with the forward gear bevel gear and the reverse gear bevel gear, the jaw clutch is fixedly connected with the propeller shaft, and the jaw clutch moves linearly along the propeller shaft and cooperates with the forward gear bevel gear and the reverse gear bevel gear.

3. The special outboard motor capable of stealthy underwater navigation according to claim 1, characterized in that, The shell comprises an engine compartment, a transmission compartment and a driving compartment. The driving device is installed in the engine compartment, and the engine compartment and the driving compartment are fixed at both ends of the driving compartment and are in sealed connection. The crankshaft is located in the transmission compartment and extends into the engine compartment and the driving compartment.

4. The special outboard motor capable of stealthy underwater navigation according to claim 1, characterized in that The water circulation refrigeration unit comprises a centrifugal water pump, a cooling water pipe and a drain pipe. The centrifugal water pump is installed in the shell, one end of the cooling water pipe is communicated with the centrifugal water pump, the other end of the cooling water pipe is communicated with the water inlet of the cooling water channel of the cold-sensitive cylinder, and the water outlet of the cooling water channel is communicated with the outside.

5. The special outboard motor capable of stealthy underwater navigation according to claim 1, characterized in that, The chemical heating cavity comprises a reaction chamber and at least two containers. The reaction chamber is communicated with the heat-sensitive cylinder, the containers are all communicated with the reaction chamber, and electromagnetic valves are arranged on the connecting channels between the reaction chamber and the heat-sensitive cylinder and between the containers and the reaction chamber.

6. The special outboard motor capable of stealthy underwater navigation according to claim 5, characterized in that The chemical heating cavity further comprises a reaction product discharge port. The reaction product discharge port is arranged at the bottom of the reaction chamber, and the reaction product discharge port is provided with an on-off electromagnetic valve.

7. The special outboard motor for the concealable underwater navigation according to claim 1, characterized by The outboard engine further comprises an operating system and a suspension system. The operating system and the suspension system are fixedly connected with the shell.

8. The special outboard motor for concealable underwater navigation according to claim 1, characterized in that The heat-sensitive cylinder and the cold-sensitive cylinder are filled with a certain amount of gas.

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