Power transmission system of amphibious vehicle, amphibious vehicle and power transmission arrangement method

Abstract

The invention discloses a power transmission system of an amphibious vehicle, the amphibious vehicle and an arrangement method of the amphibious vehicle, and aims to solve the problem that an existing amphibious vehicle transmission system is complex in arrangement and uneven in weight distribution, so that the water floating state is poor. The system comprises a power driving module arranged in the middle of a ship-shaped vehicle body; the land transmission module is connected with the power driving module; and the water transmission module is connected with the power driving module. The power driving module comprises a land and water transfer case which is used for selectively outputting power to the land transmission module or the water transmission module. The power driving modules serving as main weight sources are arranged in the middle of the vehicle in a centralized mode, the center of mass of the vehicle is aligned with the center of buoyancy in the vertical direction, and therefore the ideal floating state parallel to the water surface is achieved when the vehicle sails on the water, sailing safety and efficiency are remarkably improved, and axle load distribution is optimized when the vehicle runs on the land. The system is simple in structure and balanced in layout.

Description

Technical Field

[0001] The present invention relates to the field of vehicle engineering technology, and in particular to a power system layout for improving the floating state of a vehicle on water, and more particularly to a power transmission system of an amphibious vehicle, an amphibious vehicle, and a power transmission layout method. Background Art

[0002] Amphibious vehicles are specialized vehicles that can travel not only on land but also on water, offering a wide range of applications in military, rescue, exploration, and entertainment. To achieve both amphibious and amphibious functions, their design must strike a delicate balance between vehicle and vessel performance.

[0003] To ensure safety and prevent water leakage during navigation, amphibious vehicles typically utilize a well-sealed boat-shaped hull. Unlike traditional automobiles, a boat-shaped hull must house two complex systems: a land-based transmission system and a water-based transmission system. Unlike traditional ships, in addition to the water-based propulsion system, heavy components such as the engine, transmission, axles, and wheels for land travel must also be housed within the hull. The weight and layout of these components directly determine the amphibious vehicle's posture in the water, or its buoyancy.

[0004] Floatation is a key factor affecting the safety and speed of amphibious vehicles on the water. Unsatisfactory floatation, such as excessive frontal sag (forward tilt) or rearward tilt (backward tilt), can pose serious problems. Forward tilt dramatically increases resistance, reduces speed, and in strong winds and waves, risks the front of the vehicle plunging into the water, causing water ingress. Backward tilt can cause water to enter weak seals at the rear, also threatening vehicle safety.

[0005] Currently, amphibious vehicles have a variety of powertrain options, including traditional internal combustion engines, hybrid drives, and front- and rear-mounted engine layouts. However, each option significantly impacts the vehicle's weight distribution, resulting in varying buoyancy and making it difficult to achieve an ideal level surface.

[0006] For example, Chinese patent application CN114771172A discloses a power drive system and method for amphibious vehicles using dual water jet propulsion. In order to achieve complex power distribution, this solution uses a multi-functional transmission box to divert water and land drive, and adopts a series hybrid power system when driving on land. This hybrid power solution requires the placement of heavy power battery packs, generators and other additional drive units in the vehicle. The addition of these components makes the structure and control of the entire power system extremely complex, which not only increases manufacturing costs and maintenance difficulties, but also makes it more difficult to optimize the weight distribution of the entire vehicle. The overall solution layout is complex, making it difficult to achieve an ideal floating state.

[0007] Therefore, how to simplify the power transmission system structure of amphibious vehicles and fundamentally optimize their weight layout to obtain an ideal floating state on water, thereby improving the safety and navigation performance of the vehicle, is a technical problem that needs to be urgently solved in this field. Summary of the Invention

[0008] The primary purpose of this invention is to address the technical issues in existing amphibious vehicle transmission systems, such as complex layout and uneven weight distribution, which in turn lead to poor buoyancy on water, impacting safety and navigation efficiency. To this end, the present invention proposes a modular power transmission system with a simple structure and balanced layout, an amphibious vehicle employing this system, and a corresponding deployment method.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] In a first aspect, the present invention provides a power transmission system for an amphibious vehicle, comprising:

[0011] Boat-shaped body;

[0012] A power drive module, the power drive module being arranged in the middle of the boat-shaped body;

[0013] a land transmission module, connected to the power drive module, for driving the amphibious vehicle to travel on land;

[0014] a water transmission module, connected to the power drive module, for driving the amphibious vehicle to sail on water;

[0015] The amphibious transfer case is configured to selectively output power from the engine assembly to the land transmission module and / or the water transmission module.

[0016] In some optional embodiments of the present invention, the power drive module includes an engine, a gearbox transmission-connected to the engine, and an amphibious transfer case transmission-connected to the gearbox.

[0017] Preferably, in the power drive module, the engine, gearbox and amphibious transfer case are arranged in series along the length direction of the ship-shaped body.

[0018] Preferably, the amphibious transfer case has at least two power output ends, one power output end is used to transmit power to the land transmission module, and the other power output end is used to transmit power to the water transmission module.

[0019] In some optional embodiments of the present invention, the land transmission module includes a front axle provided at the front of the boat-shaped body and a rear axle provided at the rear of the boat-shaped body.

[0020] Preferably, the land transmission module further includes a transfer case, which is arranged between or after the gearbox and the amphibious transfer case and is used to distribute power to the front axle and the rear axle.

[0021] Preferably, the power output end of the amphibious transfer case, which is used to transmit power to the land transmission module, is in transmission connection with the power input end of the transfer case.

[0022] In some optional embodiments of the present invention, the water transmission module includes a water propeller arranged at the rear of the ship-shaped body.

[0023] Preferably, the water propulsion device is a water jet propulsion device.

[0024] In some optional embodiments of the present invention, the amphibious vehicle further includes a cockpit disposed at the front of the ship-shaped body, and a passenger compartment or a cargo compartment disposed behind the power drive module.

[0025] In some optional embodiments of the present invention, the center position of the power drive module corresponds to the center of gravity of the ship-shaped body, so that when the amphibious vehicle is sailing on water, the entire vehicle floats parallel to the water surface.

[0026] In a second aspect, the present invention provides an amphibious vehicle comprising a power transmission system as described in any one of the first aspects.

[0027] In some optional embodiments of the present invention, the centralized arrangement of the power drive modules enables the center of mass of the amphibious vehicle to be located in the middle of the ship-shaped body, thereby achieving balanced front and rear axle loads when the amphibious vehicle is traveling on land.

[0028] In some optional embodiments of the present invention, the centralized arrangement of the power drive modules allows the center of mass of the amphibious vehicle to be vertically aligned with the center of buoyancy on water, thereby minimizing the water flow resistance encountered by the amphibious vehicle when sailing on water.

[0029] In a third aspect, the present invention provides a power transmission arrangement method for an amphibious vehicle, which is applied to an amphibious vehicle having a boat-shaped body, comprising the following steps:

[0030] Arrange the power drive module: Arrange the power drive module including the engine, gearbox and amphibious transfer case as a whole in the middle area of ​​the ship-shaped body in the longitudinal direction;

[0031] Arranging a land transmission module: arranging the land transmission module including a front axle and a rear axle in the ship-shaped body, wherein the front axle is located at the front and the rear axle is located at the rear;

[0032] Arranging a water transmission module: arranging the water transmission module including the water propeller at the rear of the ship-shaped body;

[0033] Establishing transmission connection: establishing transmission connection between the land transmission module and the water transmission module and the power drive module respectively;

[0034] By arranging the power drive module in the middle area, when the amphibious vehicle is sailing on water, the center of mass of the entire vehicle is located in the middle of the boat-shaped body, so that the floating state of the entire vehicle is basically parallel to the water surface.

[0035] In some optional embodiments of the present invention, the step of arranging the power drive module specifically includes: arranging the engine, the gearbox and the amphibious transfer case in series in sequence along the length direction of the ship-shaped body.

[0036] In some optional embodiments of the present invention, the step of establishing a transmission connection includes: selectively transmitting power to the land transmission module or the water transmission module through the amphibious transfer case.

[0037] In some optional embodiments of the present invention, the step of arranging the land transmission module further includes: arranging a transfer case between the power drive module and the front axle and the rear axle for distributing power from the power drive module to the front axle and the rear axle.

[0038] In some optional embodiments of the present invention, the method further includes: arranging a driving seat at the front of the ship-shaped body and in front of the power drive module; and arranging a passenger cabin and / or cargo cabin at the rear of the ship-shaped body and behind the power drive module.

[0039] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0040] 1. Simplified Structure and Rational Layout: This invention utilizes a modular design approach, integrating the core components of the powertrain (engine, transmission, and transfer case) into a single powertrain module, located in the center of the vehicle. Compared to the complex hybrid systems of existing technologies, this invention eliminates the need for additional components such as batteries and generators, resulting in a simpler structure, higher reliability, and easier maintenance.

[0041] 2. Optimizing buoyancy on water, improving safety and speed: The core advantage of this invention lies in the central placement of the heaviest power drive module. This layout places the vehicle's center of mass in the middle of the boat-shaped body, essentially aligning vertically with its center of buoyancy when sailing. As a result, the vehicle maintains an ideal buoyancy position, essentially parallel to the water surface, both in still water and while moving. This not only avoids the risk of water ingress due to bow or stern sinking, significantly improving navigation safety, but also minimizes water resistance on the hull, contributing to improved speed and fuel economy.

[0042] 3. Improved Land Performance: The mid-mounted powertrain layout also benefits land-based driving performance. It achieves a more balanced front-to-rear axle load distribution, avoiding the top-heavy or top-heavy issues common in traditional front- or rear-engine vehicles. This improves the vehicle's handling stability, braking performance, and ride comfort on land.

[0043] 4. High Space Utilization: The mid-engine layout clearly separates the cockpit, passenger / cargo compartment, and power module. The cockpit can be positioned at the front of the vehicle for excellent visibility, while the passenger compartment or cargo compartment can be located behind the power module, achieving efficient space utilization and optimal load distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments disclosed in the present invention, the drawings of the embodiments will be briefly introduced below. These drawings are only used for illustrative purposes and are not intended to limit the scope of protection of the present invention.

[0045] Figure 1 Schematic diagram of the transmission system of the mid-mounted power drive module in an embodiment of the present invention.

[0046] Figure 2 It is a schematic block diagram of the modular design of the power transmission system in an embodiment of the present invention.

[0047] Figure 3 It is a top view of the entire layout of the amphibious vehicle in an embodiment of the present invention.

[0048] Figure 4 It is a side view of the overall layout of an amphibious vehicle in an embodiment of the present invention.

[0049] In the figure: 10, ship-shaped body; 20, power drive module; 21, engine assembly; 22, gearbox; 23, amphibious transfer case; 30, land transmission module; 31, front axle; 32, rear axle; 33, transfer case; 34, wheels; 35, drive shaft; 40, water transmission module; 41, water jet propulsion; 50, cockpit; 60, passenger / cargo compartment. DETAILED DESCRIPTION

[0050] The following further describes the technical solutions (including preferred technical solutions) of the present invention through accompanying drawings and by enumerating some optional embodiments of the present invention. It should be understood that the embodiments described are merely some, and not all, of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0051] Example 1

[0052] This embodiment describes in detail a power transmission system of an amphibious vehicle according to the present invention. Figures 1 to 4 .

[0053] like Figure 2 As shown, the system can be clearly divided into three functional modules: a power drive module 20 , a land transmission module 30 and a water transmission module 40 .

[0054] The power drive module 20 is the power source and control center of the entire system, and also represents the bulk of the vehicle's weight. In the present invention, this module is positioned integrally in the longitudinal center of the boat-shaped hull 10. This "center-mounted" layout is the key to the present invention, radically overturning traditional front- or rear-mounted layouts.

[0055] like Figure 3 and Figure 4 As shown, the power drive module 20 is preferably composed of the following components connected in series:

[0056] Engine assembly 21: As the sole power source for the vehicle, it can be a high-performance turbocharged diesel engine, providing powerful torque to meet the needs of off-road and water propulsion. The engine assembly also includes accessories such as its cooling system (such as the radiator and fan), intake and exhaust systems, etc. These accessories are also integrated into the power drive module 20, forming a compact whole.

[0057] Transmission 22: Following the engine assembly 21, an automatic or manual transmission is used to adjust the output speed and torque. For heavy amphibious vehicles, a heavy-duty automatic transmission with multiple forward and reverse gears is typically selected to simplify driving operations and adapt to complex operating conditions.

[0058] Amphibious transfer case 23: This is the core component that enables seamless switching between aquatic and amphibious modes. Its housing is directly connected to the output of the transmission 22. The aquatic transfer case 23 incorporates a sophisticated planetary gear mechanism or meshing sleeve mechanism, controlled by an electronic or hydraulic control unit. It features at least two power output flanges. One flange (the land output) connects to the land transmission module 30, and the other flange (the water output) connects to the water transmission module 40. The driver uses the mode selector switch in the cockpit 50 to issue commands to the vehicle's control unit, which in turn activates the actuator within the aquatic transfer case 23 to achieve selective power output. For example, in land mode, the clutch engages, transferring power to the land output while disconnecting the water output. In water mode, the reverse operation occurs.

[0059] The land transmission module 30 is responsible for realizing the land driving function of the vehicle. Its main components are dispersedly arranged at the front and rear ends of the boat-shaped body 10 to cooperate with the power module in the middle.

[0060] The front axle 31 and rear axle 32 are mounted at the front and rear of the boat-shaped vehicle body 10, respectively. These axles typically utilize drive axles with wheel-side speed reducers to provide greater driving force. These axles are connected to the vehicle body via a suspension system (such as a double wishbone independent suspension or integral axle suspension).

[0061] Transfer case 33: In order to obtain strong off-road capability, the vehicle of this embodiment is designed to be full-time or part-time four-wheel drive. Therefore, a standard transfer case 33 is added to the power chain. Figure 3 As shown, the power output from the land output end of the amphibious transfer case 23 is first transmitted to the transfer case 33. The transfer case 33 then distributes the power to the two drive shafts 35 in a certain ratio (e.g., 50:50 or intelligently adjusted according to road conditions).

[0062] Drive shaft 35 and wheels 34: A front drive shaft transmits power from the transfer case 33 to the front axle 31, and a rear drive shaft transmits power to the rear axle 32. The axle then drives the wheels 34 through the half shafts to rotate, making the vehicle move forward or backward.

[0063] The water transmission module 40 is responsible for the vehicle's water navigation function. Its layout strives to be simple and efficient.

[0064] The water propeller 41 is preferably a water jet propulsion system (also known as a water pump), which is installed below the tail of the boat-shaped body 10 or on the stern board. Compared with traditional propellers, water jet propulsion systems have advantages such as high efficiency, good maneuverability, shallow draft, and resistance to entanglement by aquatic plants and debris, making them very suitable for amphibious vehicles.

[0065] Transmission connection: From the water output end of the amphibious transfer case 23, a dedicated water transmission shaft is drawn out. This transmission shaft extends rearward along the bottom of the vehicle body and is directly connected to the input shaft of the water jet propulsion unit 41. This transmission route is short and straight, and the transmission efficiency is high.

[0066] By centralizing the heaviest power drive module 20 in the center and placing the relatively lighter transmission components (axles and propellers) at both ends, the present invention successfully controls the vehicle's center of mass near the geometric center of the boat-shaped body 10. This lays the physical foundation for achieving ideal buoyancy on water and axle load balance on land.

[0067] Land driving mode:

[0068] Step 1: The driver selects "Land Mode" through the control panel.

[0069] Step 2: The vehicle control system receives the instruction and controls the amphibious transfer case 23 to switch the power output channel to the land transmission module 30 , while disconnecting from the water transmission module 40 .

[0070] Step 3: The power generated by the engine assembly 21 is finally transmitted to the front and rear axles 31, 32 and wheels 34 through the gearbox 22, transfer case 33, and transmission shaft 35, driving the vehicle to travel on land. At this time, the water jet propulsion system 41 is not working.

[0071] Water navigation mode:

[0072] Step 1: After the vehicle enters the water, the driver selects "Water Mode".

[0073] Step 2: The control system controls the amphibious transfer case 23 to switch the power output channel to the water transmission module 40 , while disconnecting from the land transmission module 30 .

[0074] Step 3: The power of the engine 21 passes through the gearbox 22, the amphibious transfer case 23 and a dedicated transmission shaft to directly drive the water jet propulsion unit 41 located at the rear of the vehicle.

[0075] The 4th step: water jet propulsion device 41 sucks water flow and sprays backward at a high speed, utilizes reaction force to promote vehicle to advance on water.At this moment, wheel 34 can be in idling state, or promotes by suspension system, to reduce water flow resistance.

[0076] Example 2

[0077] This embodiment describes a complete amphibious vehicle using the power transmission system described in Example 1, and focuses on its overall vehicle layout and performance advantages.

[0078] Please refer again Figure 3 and Figure 4The overall design of the vehicle fully utilizes the advantages brought by the central placement of the power drive module 20.

[0079] Functional Area Division: The vehicle is clearly divided into three areas along its length: the front cockpit 50, the central power compartment (housing the power drive module 20), and the rear passenger / cargo compartment 60. This layout, similar to some mid-engine supercars or specialized vehicles, achieves a high degree of functional separation and optimized space utilization.

[0080] Cockpit 50: Located at the front of the vehicle, it provides space for one to three passengers (including the driver). The forward-positioned cockpit allows for a large front windshield and side windows, providing the driver with an unobstructed 360-degree view, which is crucial for both navigating complex land terrain and sailing in open water.

[0081] Power Compartment: Located in the center of the vehicle, it houses the compact power drive module 20. Separated from the cockpit 50 and passenger / cargo compartment 60 by a robust, sealed bulkhead, the power compartment effectively isolates noise, vibration, and heat, enhancing ride comfort. Necessary maintenance access and cooling grilles are also provided on the top or sides of the vehicle.

[0082] Crew / Cargo Compartment 60: Located at the rear of the vehicle, this space is organized and can be configured with multiple rows of seats to accommodate a squad of soldiers or rescue personnel, or as a flat cargo platform for transporting equipment, supplies, or stretchers, depending on mission requirements.

[0083] Performance advantage analysis:

[0084] Water performance: This is the most important advantage of the present invention. When the vehicle is launched into the water, its overall weight (gravity G, acting on the center of mass) counteracts the buoyancy F provided by the water (acting on the center of buoyancy, i.e., the centroid of the water body). Since the shape of the boat-shaped body 10 is relatively regular, its center of buoyancy is usually also located near the geometric center of the hull. By placing the power drive module 20, which serves as the main source of weight, in the center of the present invention, the center of mass of the entire vehicle is also located near the geometric center of the hull. Therefore, the center of mass and the center of buoyancy almost coincide in the vertical direction. The direct result of this is that the vehicle can maintain a posture that is basically parallel to the water surface in the water, that is, a "floating" state.

[0085] Improved safety: The floating state is avoided Figure 1 The back and Figure 2 The freeboard height (the vertical distance from the waterline to the deck) at the bow and stern is guaranteed, which greatly reduces the risk of being submerged by waves in wind and waves, and makes a qualitative leap in navigation safety.

[0086] Improved efficiency: From a fluid dynamics perspective, the wetted area and shape of the hull in the water are optimized when floating flat, minimizing wave-making resistance and frictional resistance. This means that with the same engine power, the vehicle can achieve a higher speed. In other words, at a specific speed, the engine consumes less fuel.

[0087] On-land Performance: The advantages of a mid-engine layout also apply to land. In traditional front-engine vehicles, the front axle load is significantly greater than the rear axle; in rear-engine vehicles, the opposite is true. This uneven axle load distribution can affect vehicle handling, braking, and tire wear. With the vehicle of the present invention, since the center of mass is located nearly midway between the front and rear axles, the static loads on the front and rear axles can be designed to be very close, for example, achieving an ideal 50:50 ratio.

[0088] Handling stability: Balanced axle load distribution means that the grip of the four wheels34 is more even, making the vehicle's dynamic response more stable and predictable whether accelerating, braking or turning.

[0089] Passability: In off-road conditions, the balanced axle load enables all four wheels to obtain better adhesion. Combined with the four-wheel drive system, it can exert maximum traction and improve the vehicle's passability.

[0090] Example 3

[0091] This embodiment describes the design and manufacturing method for realizing the above-mentioned amphibious vehicle layout.

[0092] The method is applied to an amphibious vehicle having a boat-shaped body (10), and comprises the following core steps:

[0093] Step 1: Arrange the power drive module. During the initial design phase, using 3D modeling software (such as CATIA or SolidWorks), the power drive module 20, which integrates the engine assembly 21, transmission 22, and amphibious transfer case 23, is positioned as a single unit in the geometric center of the boat-shaped body 10. Specifically, its center of mass is positioned roughly midway between the vehicle's front and rear wheel axes. This step requires repeated weight and balance calculations to determine the optimal and precise installation point.

[0094] Step 2: Arrange the Land Transmission Module. After determining the location of the power drive module 20, arrange the remaining components of the land transmission module 30 around it. Position the front axle 31 assembly at the front of the vehicle body, and the rear axle 32 assembly at the rear. Then, position the transfer case 33 in a suitable location behind (or before, depending on the specific series connection order) the power drive module 20.

[0095] Step 3: Arrange the water transmission module. Arrange the water jet propulsion unit 41 assembly on the stern plate of the ship-shaped body 10.

[0096] Step 4: Establish the transmission connection. This step involves the design and layout of the transmission shaft.

[0097] Two transmission shafts 35 are designed and arranged from the transfer case 33 to the front axle 31 and the rear axle (32).

[0098] A dedicated transmission shaft from the water output end of the amphibious transfer case 23 to the water jet propulsion unit 41 is designed and arranged.

[0099] Make sure all driveshafts are the correct angle and length, and use universal joints to compensate for angle changes caused by axle hop.

[0100] Step 5: Arrange the functional compartments. After the power and transmission system layout is determined, the superstructure and compartments are arranged. In front of the power drive module 20, the cockpit 50 is placed. Behind it, the passenger compartment or cargo compartment 60 is placed.

[0101] Step 6: Iterative Optimization. After completing the initial layout, a detailed weight analysis and center of mass calculation are performed on the vehicle. Based on the results, the positions of major components (especially the powertrain module) are fine-tuned, and weight balancing is performed by adjusting the positions of accessories such as the fuel tank and spare tire until the vehicle's center of mass meets design requirements under both unloaded and typical fully loaded conditions. This means the vehicle floats flat on water and achieves balanced front and rear axle loads on land.

[0102] By following the above method, an amphibious vehicle having the excellent performance described in the present invention can be systematically and scientifically designed and manufactured.

[0103] In summary, the present invention fundamentally solves the weight distribution problem in the prior art through an innovative modular layout solution with a mid-mounted power drive module as the core, and provides an amphibious vehicle solution with a simple structure and excellent performance.

[0104] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. For example, the water propulsion system may employ other forms, such as a retractable propeller, and the land-based transmission system may be designed as a simplified two-wheel drive system. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A power transmission system for an amphibious vehicle, characterized in that: include: A power drive module (20) is provided in the middle of the boat-shaped body (10) of the amphibious vehicle; A land transmission module (30) is connected to the power drive module (20) and is used to drive the amphibious vehicle to travel on land; A water transmission module (40) is in transmission connection with the power drive module (20) and is used to drive the amphibious vehicle to sail on water; The power drive module (20) includes an amphibious transfer case (23), and the amphibious transfer case (23) is configured to selectively output power from the power drive module (20) to the land transmission module (30) and / or the water transmission module (40).

2. The system according to claim 1, wherein: The power drive module (20) further comprises an engine assembly (21) and a gearbox (22) in transmission connection with the engine assembly (21); the amphibious transfer case (23) is in transmission connection with the gearbox (22).

3. The system according to claim 2, characterized in that In the power drive module (20), the engine assembly (21), the gearbox (22) and the amphibious transfer case (23) are sequentially arranged in series along the length direction of the ship-shaped body (10).

4. The system according to claim 1, wherein: The land transmission module (30) comprises a front axle (31) arranged at the front of the boat-shaped body (10) and a rear axle (32) arranged at the rear of the boat-shaped body (10).

5. The system according to claim 4, characterized in that The land transmission module (30) further includes a transfer case (33), and the transfer case (33) is used to distribute power to the front axle (31) and the rear axle (32) to achieve four-wheel drive.

6. The system according to claim 1, wherein: The water transmission module (40) comprises a water propeller (41) arranged at the tail of the ship-shaped body (10).

7. The system according to claim 6, characterized in that The water propeller (41) is a water jet propeller.

8. An amphibious vehicle, characterized in that: It comprises a boat-shaped body (10) and a power transmission system as claimed in any one of claims 1 to 7.

9. The amphibious vehicle according to claim 8, characterized in that: The amphibious vehicle further comprises a cockpit arranged at the front of the boat-shaped body (10), and a passenger cabin or a cargo cabin arranged at the rear of the power drive module (20).

10. A power transmission arrangement method for an amphibious vehicle, applied to an amphibious vehicle having a boat-shaped body (10), characterized in that: The following steps are involved: Arranging the power drive module: arranging the power drive module (20) including the engine assembly (21), the gearbox (22) and the amphibious transfer case (23) as a whole in the middle area of ​​the ship-shaped body (10) in the longitudinal direction; Arranging a land transmission module: arranging a land transmission module (30) including a front axle (31) and a rear axle (32) in the ship-shaped body (10), wherein the front axle (31) is located at the front and the rear axle (32) is located at the rear; Arranging a water transmission module: arranging a water transmission module (40) including a water propeller (41) at the rear of the ship-shaped body (10); Establishing a transmission connection: establishing a selective transmission connection between the land transmission module (30) and the water transmission module (40) and the power drive module (20) through the land and water transfer case (23).

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